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Press Discs, Prototypes and Game Tests
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Pathway to Glory Beta Collections
Topic: Pathway to Glory Beta Collections
The Malware Museum
by Mikko Hyppönen
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This paper categorizes different types of virus activation routines which are found in existing viruses and also discusses what triggers these activation routines. Common viruses are used as examples where possible. This paper also covers why it is important to know what a virus exactly does if you are infected by one. Some horror stories of the worst possible activation routine in a virus are also included. The scope of this paper is limited to PC compatible machines.
Topics: virus, viruses, activation, routines, routine, antivirus, user, mosaic, hard, machine, activation...
The Malware Museum
by Mikko Hyppönen
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This paper will discuss methods viruses use or might use in the future to attack anti-virus programs. Attacks of this kind are becoming more common, as virus writers seem to be constantly looking for ways to make their viruses more efficient and vigorous. This paper also suggests how to make antivirus products more resistant against such attacks. The scope of this paper is limited to PC compatible machines
Topics: virus, program, viruses, attack, vims, scanner, programs, code, retrovirus, resident, virus...
2600 DeCSS Scans Collection
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Memo To Terry Tang Re WIPO Treaties June 30 1998
Topics: copyright, technological, copyrighted, MPAA, digital, wipo, protections, protection, circumvention,...
Audio Week Bleak Prospects This Year For DVD Audio Specification
Topics: dvd, audio, khz, DeCSS, hybrid, pioneer, philips, converting, audiow, recording, references, dvd...
2600 DeCSS Scans Collection
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Testimony Depositions: Frederic Hirsch 2000 07 06
Topics: hirsch, decss, mpaa, frederic, dvd, recall, understanding, universal, dvds, corley, universal city,...
2600 DeCSS Scans Collection
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Report Of The Copy Protection Working Group June 21 1996
Topics: digital, analog, content, DeCSS, consumer, dvd, devices, protection, copy, encryption, data,...
"Presented to Parliament pursuant to sections 39 and 39A of the Police Act 1996."
Topics: police, code, pursuits, officers, practice, management, acpo, chief, promulgation, tactics,...
Dated May 2012. Effective from midnight on the day that The Terrorism Act 2000 (Codes of Practice for the Exercise of Stop and Search Powers) Order 2012 comes into force
Topics: authorisation, search, terrorism, authorising, officer, vehicle, code, powers, police, person,...
Topics: border, agency, inspection, annual, origin, independent, report, asylum, staff, inspections, asylum...
Topics: missing, police, acpo, bureau, persons, forces, code, data, unidentified, relation, share data,...
Official Documents UK Mirror
by Great Britain. Home Office
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"December 2010."
Topics: injunction, respondent, court, gang, injunctions, evidence, applicant, applicants, breach,...
Dated January 2011
Topics: child, maternity, ssmg, grant, regulations, subsequent, social, families, poverty, impact, time...
Dated March 2010
Topics: hmrc, dwp, deductions, claimants, customer, recovery, debt, trial, repayment, debts, maximum rate,...
Official Documents UK Mirror
by Cultural, Reviewing Committee On The Export Of Works Of Art And Objects Of
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The UK's export controls of objects of cultural interest are aimed to strike a balance between the need to protect the heritage, the rights of owners and the encouragement of a thriving art market. This is the seventh annual report on the operation of export controls on objects of cultural interest which covers the period 1 May 2010 to 30 April 2011. As well as the Reviewing Committee report, it includes descriptions of individual export cases that were referred to the Committee by expert...
Topics: export, waverley, cultural, painting, deferral, licence, art, objects, case, applicant, initial...
On cover: Police and Criminal Act (PACE): Code F
Topics: recording, code, interview, visual, interviewer, suspects, suspect, interviews, master, officer,...
Official Documents UK Mirror
by Great Britain. Home Office
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Dated October 2010
Topics: licensing, premises, licence, authorities, alcohol, conditions, guidance, authority, application,...
Topics: appointed, customs, cash, search, searches, approval, seized, person, report, officer, customs...
Official Documents UK Mirror
by Great Britain. Home Office
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Dated December 2011
Topics: injunction, respondent, court, applicant, order, application, gang, applicants, supervision,...
WIPO One Year Later Assessing Consumer Access To Digital Entertainment On The Internet 1999 10 28
Topics: internet, mpaa, dmca, DeCSS, piracy, content, motion, copyright, digital, consumer, whois, motion...
2600 DeCSS Scans Collection
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Apex Folder Part 2: ValentiKeynoteCES
Topics: digital, valenti, surity, cema, movie, association, piracy, electronics, industry, fax, surity...
2600 DeCSS Scans Collection
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Apex Folder Part 1: Carol Flaherty Apex
Topics: apex, macrovision, dvd, web, hidden, zhenjiang, ess, jiangkui, copy, digital, copy protection, web...
2600 DeCSS Scans Collection
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Universal City Studios V. Reimerdes Trial Volume 1 July 17 2000
Topics: thp, internet, decss, DeCSS, universal, von, divx, dvd, shawn, uic, july, motion picture, web site,...
Email Memo Fox 02 NOV 1999 Wired News DVD Piracy It Can Be Done
Topics: dvd, movie, decss, DeCSS, programmer, mpeg, ati, decoder, vcd, encryption, playback, dvd movie
2600 DeCSS Scans Collection
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Fisher Exhibit P Declaration Of Franklin Fisher
Topics: internet, llp, proskauer, DeCSS, films, consumers, licensing, rose, jul, copyright, unauthorized,...
2600 DeCSS Scans Collection
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Allnews DVD's Official Comdex Launch Delayed Again November 24 1996
Topics: dvd, videost, toshiba, DeCSS, video, references, warner, products, launch, copyright, reporters
2600 DeCSS Scans Collection
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Statement On The New Digital Millenium 2000
Topic: DeCSS
2600 DeCSS Scans Collection
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Testimony Depositions: Robert W Shuman 2000 05 15
Topics: schumann, dvd, decss, mpaa, linux, corley, universal, exhibit, johansen, robert, universal city,...
BBC Research and Development Reports
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R&D Report 1956-04 : Absolute measurements in magnetic recording. E.D. Daniel, P.E. Axon. It is shown that an absolute measure of the surface induction of a recorded tape can be made using a non-magnetic conductor of the type developed in Research Department in connection with frequency -characteristic standardisation. Following on this, an analysis of the long-wavelength response of a magnetic recording system is given which leads to a method of defining the absolute sensitivity of a tape...
Topics: tape, sensitivity, recording, induction, flux, reproducing, magnetic, head, recorded, surface,...
BBC Research and Development Reports
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R&D Report 1956-38 : Low-power V.H.F./F/M. transmitters - Galashiels area site tests. C.J. White, D.W. Taplin, R.S. Sandell, J. Hall Two sites were tested in the Galashiels area. It was found that Lindean Moor would provide the better service and this site is therefore recommended. Tests on the reception of television sound indicated the probability of a reliable signal from the Kirk o' Shotts v.h.f. transmissions for rebroadcasting from Lindean Moor.
Topics: lindean, strength, moor, shotts, dryden, site, aerial, field, transmitter, kirk, television sound,...
BBC Research and Development Reports
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R&D Report 1963-46 : 'MINAR' - A miniature rack modular system for electronic equipment. T.N.J Archard, M.A. Hammond 'MINAR' is a modular system of unit construction based on a standard 19-inch x 5 1/4 inch (48.3 cm X 13.3 cm) panel, This panel is in the form of miniature rack into which units of various sizes may be inserted. The mechanical construction is straightforward and the overall assembly of units is capable of being used either in a standard 19-inch (48.3 cm) bay or in a portable...
Topics: det, panel, rack, mounting, unit, miniature, rods, units, carrying, standard, front panel,...
BBC Research and Development Reports
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R&D Report 1966-54 : Open-limit calculus. J.W. Head Given a function of time which is "admissible" for the purposes of describing natural phenomenon its derivative and/or integral may not be "admissible". From the point view of an engineer or scientist, this is of small importance, since neither pure integration nor purse differentiation occurs in natural phenomena. For example, capacitances and inductances always appear in circuits in association with at least residual...
Topics: fourier, conceptual, limit, transform, nominal, pure, finite, admissible, integral, function,...
BBC Research and Development Reports
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R&D Report 1986-04 : Review of VHF Band I field strength prediction. R.S. Sandell, J. Malcolm-Coe The report describes the results of a review of VHF Band I field strength measurements and prediction methods. Most of the measurements were made by the BBC, and many were used in the early Nineteen-sixties to prepare CCIR propagation curves. Modern computational methods have permitted a fuller analysis of the data than has been possible previously. This has led to conclusions about the...
Topics: ccir, prediction, terrain, bbc, antenna, propagation, field, measurements, strength, height,...
Restaurant and Food Menus
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Open Apple-Vol 7 No 06-JUL 1991
Topics: apple, mac, ilgs, resource, system, file, program, macintosh, appleworks, folder, control panel,...
On 2 September 2008, in response to the economic downturn, the Government announced a package of measures to support vulnerable homeowners and the housing industry, aimed at reducing the likelihood of repossession action. This package included a number of temporary changes for working age customers to Support for Mortgage Interest (SMI). Accordingly, the Social Security (Housing Costs Special Arrangements) (Amendment and Modification) Regulations 2008 were made and laid on 15 December 2008, and...
Topics: smi, regulations, benefit, housing, claimants, support, period, customers, limit, jsa, working age,...
Official Documents UK Mirror
by Great Britain. Department for Environment, Food & Rural Affairs; Great Britain. Environment Agency
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"Presented to Parliament pursuant to Section 7 of the Flood and Water Management Act 2010."
Topics: flood, risk, coastal, erosion, local, environment, flooding, management, risks, fcerm, lead local,...
Official Documents UK Mirror
by Prison Service Pay Review Body
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The Prison Service Pay Review Body 2011 report on Northern Ireland sets out a number of recommendations regarding pay, including: a consolidated increase of ¹250 for night custody officers, operational support grades and healthcare assistants; a consolidated increase of ¹0.12 per hour for prisoner custody officers and senior prisoner custody officers; that night patrol officers be paid at a single rate of ¹18,704. These recommendations are made against the background of exceptional economic...
Topics: pay, prison, northern, remit, nips, custody, staff, ireland, northern ireland, recommendations,...
From the bitsavers.org collection, a scanned-in computer-related document. components :: fairchild :: dataBooks :: 1971 Fairchild TO92 Plastic Transistors
From the bitsavers.org collection, a scanned-in computer-related document. components :: fairchild :: dataBooks :: 1970 Fairchild Semiconductor Integrated Circuit Data Catalog
BBC Research and Development Reports
by H.D. Harwood, R.J. Packer, R.A. Ticehurst
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R&D Report 1954-29 : The design of the LIP microphone Type L2. H.D. Harwood, R.J. Packer, R.A. Ticehurst A new lip microphone of the "noise-cancelling" type has been developed, having properties basically similar to those of the type L1 but incorporating a number of improvements. The problems peculiar to this type of instrument are analysed and the construction, performance and special features of the new design are described. A large number of production models has given...
Topics: microphone, type, frequency, ribbon, magnetic, breath, noise, response, acoustic, ambient, breath...
R&D Report 1954-09 : Information on short wave propagation conditions from reception results on fixed frequencies. T.W. Bennington Regular hourly observations made at Panorama, South Africa, on reception of five fixed frequencies from Standard Frequency Station WWV have been analysed to obtain information on propagation conditions and their daily and seasonal variations, for comparison with those given by world charts of predicted MUF. The results indicate that the predications agree well...
Topics: reception, muf, frequencies, gmt, propagation, signal, frequency, predicted, luf, panorama, sinpo...
R&D Report 1954-04 : Some problems influencing the design of a machine for the high-speed dubbing of magnetic recordings. P.E. Axon The purpose of this report is to give an appreciation of some of the problems which will be met with in an alternative approach to tape duplication by the process of high-speed multi-tape dubbing.
Topics: tape, recording, dubbing, spool, reproducing, tension, shaft, magnetic, required, frequencies,...
R&D Report 1954-34 : A new photo-electric optical bench. W.N. Sproson An outline of the photoelectric method of testing lenses is given, together with some details of the two types of test pattern now in use and the form of aperture correction necessitated by the finite width of the scanning slit. The photoelectric test bench is described and a few preliminary results are quoted.
Topics: lens, modulation, wave, test, bench, microscope, optical, pattern, slit, photoelectric, wave...
BBC Research and Development Reports
by C.B.B. Wood, E.R. Rout, A.V. Lord, R.F. Vigurs
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R&D Report 1955-02 : The suppressed frame system of telerecording C.B.B. Wood, E.R. Rout, A.V. Lord, R.F. Vigurs This part summarises the fundamental and practical aspects of a suppressed-frame 35 mm telerecording machine designed and constructed by Research Department in order to provide an additional telerecording channel for use in connection with the Coronation.
Topics: signal, picture, film, recording, characteristic, frame, unit, correction, television, circuit,...
R&D Report 1955-38 : Colour television: Reduction of colour saturation resulting from vestigial-sideband reception. G.F. Newell This report deals with one form of distortion introduced by the reception of colour television using a vestigial-sideband system. In a system such as that of the N.T.S.C. modified to British standards, incoherent detection results in an increase of the luminance signal and a reduction in the chrominance signal. The effect with colour receivers is to reduce the...
Topics: luminance, receiver, saturated, modulation, waveform, colour, sideband, amplitude, monochrome,...
BBC Research and Development Reports
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R&D Report 1955-33 : Vertically polarised Band III aerial for Crystal Palace. P. Knight, G.D. Monteath, G.J. Phillips This report describes the first stage in the development, using a small-scale model, of a vertically-polarised aerial for radiating two television programmes in Band III from the Crystal Palace television station. The aerial consists of 8 tiers of tangential batwing elements mounted on a 4 ft 4 in. (1.32 m) square section of the tower.
Topics: admittance, aerial, elements, iii, tiers, mast, feeder, batwing, tier, element, mutual admittance,...
R&D Report 1956-03 : The Ronette crystal microphone cartridge Type MC.65. W.I. Manson, D.E.L. Shorter The report gives tests results on three samples of the Ronette diaphragm-type crystal microphone cartridge MC.65. The performance varies considerably between individual specimens but is on the average superior to that of earlier microphone of this kind.
Topics: microphone, ronette, frequency, crystal, cartridge, specimens, response, specimen, axial, noise,...
R&D Report 1955-28 : The effect of receiving site location on reception of 90 Mc/s transmissions over distances between 100 and 300 miles (160 and 480 km). R.A. Rowden, H. Eyet The report describes some experiments on the effect of site location on the strength and characteristics of v.h.f. signals (90 Mc/s Band) received over great distances. Short records of field strength were made at each of a number of sites relatively close together in an area distant from the transmitter and...
Topics: site, fixed, fading, median, wrotham, distance, mobile, signal, similarity, height, rapid fading,...
R&D Report 1955-20 : Measurement of noise factor, oscillator stability and frequency response of five commercial television receivers. R.V. Harvey, G.F. Newell, J.G. Spencer This report describes measurements made on five commercial television receivers manufactured between 1951 and 1954. The measurements, which include noise factor, drift of oscillator frequency, r.f. and i.f. passband shape, modulation-frequency response and group delay, are recorded here as representative characteristics...
Topics: frequency, receiver, receivers, modulation, channel, noise, drift, oscillator, measured, valves,...
R&D Report 1956-23 : Compatibility of the NTSC colour television system adapted to the 405-line standard: Field trials. W.N. Sproson Three series of field trials have been undertaken to test the compatibility aspect of the adapted N.T.S.C. colour television system.
Topics: chrominance, picture, observers, grades, grading, tests, questionnaires, slides, dots,...
BBC Research and Development Reports
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R&D Report 1960-08 : The UHF Television Survey of 1957/8: Objective measurements compared with some subjective assessments G. F. Newell, E. W. Taylor This report describes objective measurements of signal-to-noise ratios and of waveform distortions using a 'pulse-and-bar' test waveform. The results of these measurements are compared with subjective assessments. The agreement is fairly good in view of the fact that the objective measurements did not include noise or waveform distortion...
Topics: subjective, noise, waveform, assessment, series, grade, assessments, measurements, samples,...
BBC Research and Development Reports
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R&D Report 1959-10 : Peterborough: Television and V.H.F. sound services; Site tests. D.W. Taplin, C.J. White, R.S. Sandell, J. Hall The results of a site test at Morborne Hill, near Peterborough, are given. A Band I transmitter with a mean effective radiated power (e.r.p.) of 1.1 kW will provide a much improved service over most of the area but the overlap with the adjacent Crystal Palace and Holme Moss transmitters is inadequate in certain areas. A Band II transmitter with a mean e.r.p. of...
Topics: transmitter, peterborough, strength, television, unipoles, exceeded, contours, field, field...
BBC Research and Development Reports
by P. Knight, W. Wharton, G.D. Monteath
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R&D Report 1957-16 : Final report on the long-slot aerial. P. Knight, W. Wharton, G.D. Monteath In two earlier reports (E-039 issued in May 1951, and E-039/2 issued in January 1952) the results of tests on a small-scale model of a long-slot aerial are described; the measurements were made at frequency of 500 Mc/s. Tests on a larger-scale model were later made at a frequency of 200 Mc/s in order to achieve greater accuracy. The results of this last series of tests were not published when the...
Topics: slot, aerial, frequency, horizontal, band, width, radiation, gain, intrinsic, carrier, carrier...
R&D Report 1957-10 : Some experiments on the subjective effect of limiting the upper frequency range of programmes D.E.L. Shorter, W.I. Manson, E.R. Wigan To obtain first-hand knowledge of the subjective effects of high-frequency band limitation, some tests have been carried out with Research Department staff of various categories as observers (thirty-four in all), using twelve types or recorded programme material. Low-pass filters having nominal cut-off frequencies of 10 kc/s and 12 kc/s...
Topics: observers, filter, frequency, observer, programme, experiments, filters, band, material,...
R&D Report 1959-08 : Low-signal amplifying valves for use at U.H.F. R.G. Manton The object of this report is to review some of the types of valve that are suitable for use in u.h.f. amplifying stages in receivers, and to describe units which have been constructed to test the performance of two of these valves at a frequency of about 655 Mc/s.
Topics: amplifier, valve, output, input, amplifiers, anode, bandwidth, grid, gain, impedance, electrical...
R&D Report 1959-21 : Visit to the Florida terminal of the A.T. and T. Co. trapospheric scatter communications link to Cuba R.A. Rowden A report on a visit to Florida Terminal of the A.T. and T. Co. Troposheric Scatter Communications link to Cuba.
Topics: link, scatter, florida, television, tropospheric, median, multichannel, transmission, terminal,...
BBC Research and Development Reports
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R&D Report 1960-12 : The Service area of the Sandale television transmitter. D.W. Taplin, C.J. White, F.P. Raine This report gives the results of a field strength survey of the Sandale television transmitter. It is shown that the service area conforms well with that predicted from site test measurements, although there are some small towns in which the field strength is considerably less than the value predicted.
Topics: sandale, strength, field, towns, contours, polarization, television, transmitter, field strength,...
BBC Research and Development Reports
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R&D Report 1957-04 : The service area of the Pontop Pike television transmitter. D.W. Taplin, D.F. Cooney, I. Rhodes A field strength survey of the Pontop Pike television transmission has been carried out. The service provided conforms well with that expected from site test measurements. The heavily populated industrial areas of Tyneside area well served. The Tees-side area is provided with a fair service.
Topics: pontop, pike, transmitter, transmission, strength, contours, field, median, pontop pike, populated,...
BBC Research and Development Reports
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R&D Report 1962-13 : Determination of the effective modulation depth of monophonic programme transmitted on the Zenith-GE stereophonic system D.E.L. Shorter In the Zenith-G.E. stereophonic broadcasting system, a small proportion of the available modulation capacity is taken up by a pilot signal used in the demodulation process at the receiver. The remainder is divided between the sum of the left- and right-hand stereophonic signals, transmitted in the same way as a monophonic programme, and...
Topics: signal, monophonic, stereophonic, programme, test, transmitter, level, modulation, amplitude,...
BBC Research and Development Reports
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R&D Report 1961-07 : Crystal-diode modulators for the frequency range 10-1000 Mc/s. G.J. Phillips, R.G. Manton This report describes the development of low-power balanced diode modulators suitable for amplitude modulation by television or sound signals of a carrier in the frequency range 10-1000 Mc/s. From an original model, built in 1954, two later models have been developed having better performance in regard to the insertion loss at the carrier frequency, and uniformity of modulation...
Topics: modulator, modulation, frequency, insertion, signal, amplitude, impedance, transformer, output,...
BBC Research and Development Reports
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R&D Report 1962-18 : The Visibility of delayed images in television. G.F. Newell, D. Howorth This report describes subjective measurements of the visibility of delayed images superimposed on a 405-line television picture. The visibility of these images, which can occur as a result of a reflected signal caused by a mast or other reflecting object in the propagation path of the direct signal, depends on the amplitude and phase of the reflected signal relative to those of the direct signal....
Topics: excerpt, delayed, signal, observers, visibility, reflected, excerpts, direct, grades, amplitudes,...
BBC Research and Development Reports
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R&D Report 1962-02 : The Colour response of monochrome television camera tubes C.B.B. Wood This report describes a number of subjective tests which were carried out to determine viewer's performances and tolerances for relative colour response in television cameras. Relative colour response is a term used to describe the characteristic by which the camera portrays the colours of the original scene as simple luminances in the black-and-white television image. Other tests were conducted to...
Topics: response, colour, observers, television, luminance, filters, orthicon, camera, neutral, image,...
BBC Research and Development Reports
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R&D Report 1961-16 : Visit to Jersey and Normandy to investigate co-channel interference between North Hessary Tor and Caen. R.F. Vigurs An investigation has been carried out in Jersey and parts of the Cherbourg peninsula to enquire into complaints that television reception in the service area of the French transmitting station near Caen was being affected by interference from the B.B.C. transmitter at North Hessary Tor. A few days were spent in discussion and carrying out observations. As...
Topics: frequency, interference, hessary, tor, transmitter, french, north, caen, television, receiver,...
BBC Research and Development Reports
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R&D Report 1962-52 : The power loss from open-wire high-frequency transmission lines due to support structures. J.B Izatt, R.G. Manton The balanced open-wire transmission lines used at high-frequency transmitting stations are subject to losses due to the currents induced in the supporting structures. This report considers the magnitude of these losses in the cases of steel and reinforced concrete support structures. A method for calculating the loss is presented and it is shown that...
Topics: structure, transmission, concrete, support, loop, dielectric, conductor, impedance, loss,...
BBC Research and Development Reports
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R&D Report 1963-25 : Test of the effectiveness of precision-best offset operation applied to the interference patterns generated by chrominance frequency-changing. E.W. Taylor It has been proposed that the exchange of programme between Europe and America might be facilitated by the use of a 525-line, 60 field per second European standard in addition to the present 625-line, 50 field per second standard. In the case of colour television transmissions, this would involve changing the...
Topics: frequency, interference, chrominance, subcarrier, generated, interfering, field, visibility,...
BBC Research and Development Reports
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R&D Report 1963-27 : An introduction to the theory of aerials H. Page This report gives an introduction to the theory of aerials with emphasis on broadcasting. The function of an aerial, when transmitting, is to propagate the electro-magnetic waves flowing from the source into space.
Topics: aerial, radiation, impedance, vertical, doublet, field, aerials, current, transmitting, pattern,...
BBC Research and Development Reports
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R&D Report 1963-20 : Photo-electric lens-testing bench. W.N. Sproson, K. Hacking A photo-electric lens test bench capable of measuring lenses of focal length from 12 mm to 1 m is described. Designed specifically for television applications, it gives the 'optical transfer" curve automatically plotted on recording paper, using the sine-wave analyser described by Hacking. Facility is also provided for the recording of the "spread function". The angular field is somewhat in...
Topics: optical, analyser, slit, lens, spatial, modulation, image, bench, measurements, function, fourier...
BBC Research and Development Reports
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R&D Report 1962-38 : The Fernseh standards converter: Visit to Rome and Darmstadt 16th - 19th July 1962. P. Ranger, E.R. Rout The report gives an overview of the visit to Rome and Darmstadt in July 1962 by members of the department to discuss, The Fernesh Standards Converter.
Topics: converter, flicker, vidicon, conversion, display, lag, standards, fernseh, portrayal, camera, scale...
BBC Research and Development Reports
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R&D Report 1962-46 : The Service area of the Les Platons VHF sound transmitters (1962). M.J. Buckley, J.H. Stewart This report gives the results of a field strength survey of the v.h.f. sound transmissions radiated from Les Platons in Jersey and Guernsey. Most of Jersey gets a satisfactory service, but about one fifth of the island of Guernsey is not served. An Engineering Information Department (E.I.D.) survey showed that the v.h.f. service in Sark from Les Platons is satisfactory but...
Topics: les, platons, strength, transmitters, ville, aerial, guernsey, field, les platons, receiving, field...
BBC Research and Development Reports
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R&D Report 1963-14 : Television co-channel interference: Some effects of the modulation of the interfering signal. E.W. Taylor The configuration of the interference pattern produced when a television transmission suffers co-channel interference from another television signal is examined in detail, in order to determine the process by which the interfering modulation gives rise to additional patterns. The description of these patterns in terms of the carriers and side-bands of the two...
Topics: interfering, frequency, pattern, signal, wanted, sideband, subsidiary, sidebands, principal,...
BBC Research and Development Reports
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R&D Report 1962-49 : Multiplex systems for stereophonic broadcasting G.J. Phillips, J.G. Spencer This report discusses the various systems which have been proposed for broadcasting stereophonic programme from a single v.h.f. transmitter. The results of laboratory tests on two systems are summarized. The first is the Zenith-G.E. system, adopted in 1961 by the F.C.C. for stereophonic broadcasting in the U.S.A. and more recently recommended by the European Broadcasting Union. The second is a...
Topics: stereophonic, subcarrier, monophonic, signal, reception, receiver, systems, system, modulation,...
BBC Research and Development Reports
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R&D Report 1964-07 : Effect of fabric coverings on the sound absorption of porous materials A.N. Burd Measurements have been carried out by the reverberation room method to determine the effect of fabric coverings on the sound absorption of porous backing materials. It is hoped that it may prove possible in the future to predict the behaviour of materials from measurements on small samples.
Topics: fabrics, absorption, resistance, fabric, backing, materials, measurements, flow, high, stretched,...
BBC Research and Development Reports
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R&D Report 1963-45 : An Instrument for recording the frequency of the public electricity supply. I.G. Gibbs, W. Rhodes Many technical considerations connected with television broadcasting require a knowledge of the daily variations in the frequency of the public electricity supply. Due to the greatly improved stability of the frequency of the supply during recent years, the information provided by existing methods of recording the frequency has proved to be insufficient and the decision was...
Topics: frequency, mains, uniselector, instrument, accuracy, total, counting, pulse, pulses, recording,...
R&D Report 1963-49 : Noise and vibration levels on the South Bank site of the proposed opera house and National Theatre. C.L.S. Gilford. Measurements of airborne noise and ground vibration on the South Bank of the Thames between County Hall and Hungerford Bridge show that the roofs of the proposed National Theatre and Opera House should give a mean sound reduction of 69 dB with a slope not exceeding 7 dB per octave. Protection of the National Theatre from vibration will present considerable...
Topics: vibration, opera, measurements, underground, ground, hungerford, maximum, theatre, national, site,...
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R&D Report 1963-60 : The suppression of corona- and precipitation-interference in vhf television reception: Thrumster experiments, second series D.J. Whythe Tests have been continued at the Thrumster station to assess the degree of suppression that can be provided against 'precipitation-static' interference on v.h.f. A second series of tests was carried out between August 1961 and February 1962 to assess the degree of interference due to charged precipitation. As for the earlier series of...
Topics: interference, aerial, protected, thrumster, corona, series, precipitation, occurrence, subjective,...
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R&D Report 1964-01 : Stereophony: the effect of crosstalk between left and right channels H.D. Harwood, D.E.L. Shorter The investigation of the effect of interchannel crosstalk in a stereophonic system, of which the first results were given in Research Report L-049, has been continued. The experiments have covered crosstalk in different regions of the audio-frequency band. The influence of acoustic environment and of the observer's position in relation to the loudspeakers has been...
Topics: crosstalk, frequency, observer, listening, image, perceptible, room, frequencies, position,...
R&D Report 1965-36 : Statistical survey of scanning amplitudes and aspect ratio of domestic television receivers R.F. Vigurs Measurements have been made on a number of domestic television receivers, operating under normal home conditions, with regard to their settings of horizontal and vertical scanning amplitudes and aspect ratio. These measurements revealed that the accuracies of the adjustments made on installation, and the standard maintained by the receivers, in these respects, were...
Topics: picture, visible, aspect, receivers, distributions, histograms, statistical, width, ratio, height,...
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R&D Report 1965-39 : UHF aerials for the Hertford television relay station G.H. Millard A summary of the installtion of the UHF Aerials for the Hertford Television Relay Station.
Topics: aerials, transmitting, feeder, mounted, dipoles, oin, horizontal, aerial, distribution,...
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R&D Report 1965-13 : Transmitting aerials for the Granton VHF television and VHF sound station D.W. Osborne, R.D.C. Thoday The Grantown relay station came onto operation on 8th February 1965. It provides a television and v.h.f sound service to Grantown, Nethy Bridge, Boat of Garten, Carrbridge and Duthil; parts of Aviemore are also served.
Topics: aerial, horizontal, dipole, tiers, gain, templet, transmitting, band, tower, radiation, radiation...
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R&D Report 1965-35 : Line-store standards conversion: The design of video transmission lines. A.H. Jones This report discusses requirements affecting the design of transmission-lines suitable for the distribution of video signal within the store assembly of one form of line-store converter. The development of two types of transmission-line which meet requirements defined is described.
Topics: store, capacitance, impedance, input, transmission, signal, lines, output, reflexions, pulses,...
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R&D Report 1965-34 : The Neumann KM64 microphone H.D. Harwood This report describes tests carried out on the latest capacitor microphone, type KM64, manufactured by Messrs, Neumann of Berlin. The microphone has a cardioid directional characteristic and is of the end-fire type design. Measurements have been made of the frequency characteristics for sound incident at various angles; the degree of interference from wind, with and without a windshield, and from magnetic fields has also been...
Topics: microphone, noise, frequency, characteristics, measurements, magnetic, type, neumann, sensitivity,...
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R&D Report 1964-79 : Method for measuring the vertical radiation patterns of UHF transmitting aerials D.J. Neale The basic methods for determining the vertical radiation pattern (vrp) of an aerial are outlined and compared with a new method which is more convenient for large aerials. Results obtained for a ten-tier aerial by this method and by the usual method of rotating the aerial on a turntable are compared. The procedure for determining the vrps of larger aerials by the new method, with...
Topics: probe, aerial, method, elements, currents, probes, element, array, measured, accuracy, admittance...
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R&D Report 1965-06 : Performance of 10 to 1 zoom lens for image orthicon format: (Type 10 x 35B No. 1095308). K.J. Wright The characteristics of the redesigned zoom lens type 10 x 35B have been measured. These include modulation transfer function, vignetting, transmission and veiling glare and geometrical distortion. An overall assessment based on sharpness and vignetting is given, and comparisons are made with production lenses type 10 x 35B and with other zoom lenses.
Topics: lens, focal, aperture, zoom, length, varotal, transfer, modulation, spatial, distortion, test...
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R&D Report 1965-27 : Digital coding equipment for recording field-strength measurements D.E. Susans This report describes a voltage coder and tape perforator which samples the d.c. output from one or more field-strength recording receivers at regular intervals and records the values by means of a 5-unit binary code, on a paper tape which can subsequently be fed into a computer for analysis.
Topics: input, unit, counter, perforator, coder, binary, voltage, amplifier, transistor, trl, technological...
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R&D Report 1964-47 : Impact of users' needs on the design of data processing systems R.W. Lee, M.E.B. Moffat The conference was held at the Heriot-Watt College Edinburgh from 31st March to 3rd April 1964. The conference papers were divided into four main categories (a) Programming and Operating Systems, (b) Storage technology and organization, (c ) Maintenance, (d) Input, output and Man-Machine Communications.
Topics: computer, data, processing, computers, digital, large, programme, magnetic, author, processer,...
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R&D Report 1964-24 : Service areas of the Great Glen chain of television and VHF sound transmitters. R.C. Vercoe, H.T. Madoc-Jones, J.A. Carter The results of field strength surveys of the Great Glen Chain of television and v.h.f sound transmitter are given in this report.
Topics: transmitters, exceeded, kinlochleven, aerial, television, ballachulish, receiving, fort, strength,...
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R&D Report 1964-55 : Ultrasonic delay lines for millisecond delays S.N. Watson, R.D.A. Mathers A one day visit to the Corning Glass Company's works at Bradford, Pennsylvania, was paid by the writers in order to discuss the performance of Corning glass delay lines. This report summarises that day's discussions.
Topics: delay, specification, corning, ultrasonic, delays, input, comments, comings, secondaries, facet,...
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R&D Report 1966-06 : Subjective assessments of the portrayal of motion produced by simulations of field-store standards conversion R.E. Davies, S.J. Lent, M.T.A. Salter It is shown that the process of television standards conversion involving a change of field frequency degrades the portrayal of movement in the scene by introducing a jerky motion to certain types of movement. Experiments are described which show that in order to provide satisfactory portrayal of motion, when converting...
Topics: frames, fields, movement, conversion, standards, portrayal, observers, second, grade, picture,...
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R&D Report 1966-02 : The Television Centre ambiophony system C.L.S. Gilford, D.K. Jones, M.E.B Moffat This report gives the results of an investigation of the ambiophony system which has been installed in Television Centre Studio 4 for some years. For the purpose of the investigation, the equipment bay and 30 loudspeakers were transferred to Kingswood Warren Large Viewing Room where uninterrupted work could be carried out.
Topics: ambiophony, loudspeakers, reverberation, microphone, system, equalisation, pulse, studio, sound,...
R&D Report 1966-08 : Derivation of colour scanner analysis characteristics to give optimum reproduction of cine film without matrixing. A.H. Jones This report describes computations made to determine the shape of the positive-only colour scanner analysis characteristics which give the optimum reproduction of colours produced by film dyes. Due regards was paid to the difficulties of instrumentation and to the necessity of achieving a good signal-to-noise ratio. It is estimated that use of...
Topics: analysis, characteristics, colours, optimum, film, reproduced, reproduction, colour, spectral,...
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R&D Report 1965-51 : Servo-controlled, one-line delay for 625-line television signals. S.M. Edwardson, A.D. Stalley, G.C. Wilkinson This report describes apparatus designed to delay a mains-locked 625-line television signal by a period equal to the duration of one television scanning line. The equipment was designed primarily for use in a line-store standards converter but has other applications in television engineering. A fused-quartz ultrasonic delay is employed as the main delay element...
Topics: delay, output, signal, gain, frequency, television, input, amplifier, variable, quartz, television...
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R&D Report 1966-60 : Transmitting aerials for the Barnstaple VHF television and VHF sound station D.W. Osborne, R.D.C. Thoday The Barnstaple relay station came into operation on the 16th May 1966. It provides a television and V.H.F., sound service to Barnstaple, Bideford and most of the intervening are including the following towns and villages: Braunton, Bishops Tawnton, Fremington, Northam, Appledore and Westward Ho.
Topics: transmitting, aerial, horizontal, band, eof, tower, templet, gain, rccgiving, feeder, transmitting...
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R&D Report 1966-61 : Choice of interpolation apertures for line-store standards converters V.G. Devereux This report is concerned with the manner in which the output signal from a line-store standards converter is influenced by the type of interpolation aperture which is used in deriving this output signal. The optimum shape of the interpolation aperture is deduced theoretically for apertures of various widths and an experiment is described which was carried out to examine the agreement...
Topics: aperture, interpolation, spectrum, input, output, vertical, signal, frequency, converted, scanning,...
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R&D Report 1967-03 : Field-store standards conversion: a controlled RF switch G.M. Le Courteur This report describes the development of a type of rf switch unit which is intended to control the rf signal routing in an experimental field-store standards converter. The switches are actuated by uni-directional control signals and contain built-in amplification so that they can be adjusted to have zero loss.
Topics: switching, switch, signal, impedance, input, element, diode, output, unwanted, switches, unwanted...
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R&D Report 1966-51 : UHF transmitting aerial for Black Hill television station G.H. Millard A u.h.f. transmitting aerial for the Lanarkshire area has been built on the support column of the existing ITA mast at Black Hill. The aerial came into operation with trade transmissions on 11th June 1966 and started full service on 9th July 1966.
Topics: aerial, channel, feeder, transmitter, mast, vision, radiation, horizontal, bbc, arrangement,...
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R&D Report 1966-53 : Transmitting aerial for the Bexhill VHF television station D.W. Osborne, R.D.C. Thoday, J.P. Crean The Bexhill relay station came into operation on 21st March 1966. It provides a television service to Bexhill only.
Topics: aerial, transmitting, horizontal, bexhill, reflector, templet, band, dipole, radiation, udc,...
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R&D Report 1966-55 : Differential fading of television signals at UHF C.P. Bell When receiving television signals at a translator rely station, for re-transmission after frequency changing, a common amplifier for sound and vision signals is usually employed. Thus the power ratio of the re-transmitted signals is the same as that received from the parent station. Differential fading of the sound and vision signals is therefore important, inasmuch as it would affect this radio. This report...
Topics: fading, vision, receiving, differential, measurements, caversham, sound, aerial, height,...
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R&D Report 1966-56 : Optimum colour analysis characteristics for colour television picture sources with three receptions. A.H. Jones The colour fidelity of a colour television signal source may be substantially improved if a linear matrix is included in the signal chain, more-over this improvement is greatest when the optical colour analysis characteristics of the source are chosen together with the matrix coefficients. This report describes computations made to determine the optimum...
Topics: characteristics, analysis, optimum, transmission, characteristic, optical, colour, matrix, ideal,...
R&D Report 1967-12 : Equipment for the statistical analysis of programme meter deflexions J.R. Chew, A.A. Harris The apparatus described examines the fluctuating deflections of a programme meter by arranging that an image of the moving pointer falls, according to its position, upon different members of a suitable array of photo cells. The positions of the cells can be set relative to the image of the scale of the instrument to record data according to the scale region of greatest interest....
Topics: meter, programme, analysis, logic, pointer, statistical, output, deflexions, bistable, data,...
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R&D Report 1967-13 : The dynamic characteristics of limiters for sound programme circuits D.E.L. Shorter, W.I. Manson, D.W. Stebbings Subjective tests have been carried out to establish the optimum dynamic characteristics of limiters used to protect transmitters and other equipment in the sound programme chain against overload through excessive signal levels. It was found impossible, with existing types of limiter, to avoid momentary excessive signal levels at the output unless the gain...
Topics: limiter, signal, gain, overshoot, recovery, delay, control, distortion, output, circuit, gain...