Journal of Research of the National Institute of Standards and Technology
Topics: wavelength division multiplexing, dispersion, metrology, optical fiber sensors, relative group...
This paper presents an equalization technique of analogue-digital or mixed signals disturbed by electromagnetic interference (EMI) and electromagnetic compatibility (EMC) effects by using negative group delay (NGD) circuit. The basic principle illustrating the mechanism of the equalization technique thanks to the NGD function is explained. To illustrate the efficiency of the technique understudy, an equalization of RC-effect is performed. According to the frequency- and time-domain analyses, a...
Topics: Negative Group Delay (NGD), Signal Integrity (SI), Equalization Technique, Electrical Interconnect,...
This study introduces comparative consequences that determine the bit error rate enhancements, resultant from adopting a proposed MIMO wireless model in this study. The antenna configurations for this model uses new small microstrip slotted patch antenna with multiple frequency bands at strategic operating frequencies of 2.4, 4.4, and 5.55 respectively. The S11 response of the proposed antenna for IEEE802.11 MIMO wireless network has been highly appropriate to be adopted with MIMO antenna...
Topics: Bit error rate, MIMO antenna, MIMO wireless networks, Negative group delay, STBC mathematical...
R&D Report 1968-57 : Pulse Response of some domestic U.H.F. television receivers, and its relation to the amplitude and group delay characteristics A. Brown, M.G. Croll The responses of seven domestic monochrome television receivers to a UHF signal modulated with a 2T pulse-and-bar waveform, have been measured, and the corresponding routine K-ratings derived. For two receivers the static amplitude and group-delay characteristics were measured, using a technique permitting independent...
Topics: pulse, amplitude, receiver, carrier, responses, video, response, characteristics, mhz, measured,...
Bell System Technical Journal, 52: 7. September 1973 pp 1169-1174. The Impulse Response of an Optical Fiber With Parabolic Index Profile. (Marcuse, D.)
Topics: modes, fiber, parabolic, waveguide, mode, delay, response, impulse, distribution, width, infinitely...
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Hewlett-Packard Journal Vol. 27 No. 3 (1975-11)(Hewlett-Packard)
Topics: phase, signal, frequency, differential, display, gain, baseband, amplitude, phasor, differential...
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Hewlett-Packard Journal Vol. 26 No. 3 (1974-11)(Hewlett-Packard)
Topics: satellite, frequency, central, data, measurement, system, file, delay, program, carrier, central...
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Hewlett-Packard Journal Vol. 24 No. 2 (1972-10)(Hewlett-Packard)
Topics: interface, data, digital, frequency, analyzer, phase, system, amplitude, network, signal, network...
Bell System Technical Journal, 55: 1. January 1976 pp 89-108. An Algorithmic Procedure for Designing Hybrid FIR/IIR Digital Filters. (Campbell, M.R.; Crochiere, R.E.; Rabiner, L.R.)
Topics: filter, fir, design, iir, digital, algorithm, hybrid, filters, magnitude, designs, magnitude...
R&D Report 1954-11 : The specification of the reflection coefficient of a F.M. aerial. G.D. Monteath If an aerial radiating f.m. transmissions is not matched to its feeder, amplitude modulation is introduced and the a.f. signal suffers non-linear distortion. The distortion is most marked if the receiver lacks a limiter. These effects are examined in this report and a limit for the reflection coefficient at the aerials is proposed. This constitutes a considerable relaxation of the...
Topics: amplitude, distortion, feeder, reflection, receiver, instantaneous, harmonic, frequency, maximum,...
R&D Report 1973-04 : Transmission filters for UHF relay stations G.H. Millard Some designs of filter are reviewed and one particular type suitable for use at UHF relay stations is considered in more detail.
Topics: resonators, resonator, mhz, filter, frequency, bbc, impedance, attenuation, filters, coupling,...
R&D Report 1977-21 : Digital video: multiple sub-Nyquist coding. J.H. Stott, G.J. Phillips This Report considers the effect of multiple digital coding of signals, with particular emphasis on sub-Nyquist sampling. Theory is developed which shows that conditions exist whereby no extra degradation due to re-sampling occurs. Experimental work confirming these results is described, and the theory is extended to the use of mixed analogue and digital transmissions, including allowance for...
Topics: filter, sampling, comb, analogue, frequency, coding, digital, response, filters, signal, video...
R&D Report 1966-09 : Resolving the conflict between amplitude and group delay requirements for certain types of low-pass filter. J.W. Head In application to television, if a low-pass filter is required and the tolerances on variation of group delay and amplitude in the effective pass band are not stringent but simplicity is important, priority should be given to meeting, the group-delay requirements. This is discussed in detail for cases in which the insertion transfer is the reciprocal of...
Topics: amplitude, gouriet, butterworth, transfer, group, compromise, function, delay, filter, unity,...
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Hewlett-Packard Journal Vol. 24 No. 1 (1972-09)(Hewlett-Packard)
Topics: logic, frequency, amplitude, output, phase, probe, microwave, logic pulser, pulser, input, sweep,...
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Hewlett-Packard Journal Vol. 17 No. 9 (1966-05)(Hewlett-Packard)
Topics: phase, frequency, voltmeter, vector, input, voltage, meter, signal, impedance, mhz, vector...
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Hewlett-Packard Journal Vol. 27 No. 11 (1976-07)(Hewlett-Packard)
Topics: frequency, phase, signal, input, sweep, analyzer, offset, model, network, network analyzer,...
R&D Report 1956-25 : A comparison of four television standards. R.D.A. Maurice The resolutions of four C.C.I.R. standard television systems are compared, some account being taken of the effects of asymmetric sideband reception. The extent to which some of distortions may be due to non-linearity of the phase-frequency characteristic is briefly mentioned.
Topics: sideband, normalised, shewn, ideal, modulation, frequency, system, transition, radians, receiver,...
R&D Report 1971-36 : Field store standards conversion: Equalisers for ultrasonic quartz delay lines R.V. Harvey A field-store standards converter has been built which uses fused quartz delay lines as the storage medium for the television signal. The associated amplifiers, which have been described elsewhere (BBC RD 1970/24), contain equalisers which allow the gain and group-delay to be adjusted so that the overall delay-unit response lies between very close, specified, limits. The present...
Topics: delay, equaliser, amplitude, equalisation, quartz, amplifier, equalisers, response, output, mhz,...
R&D Report 1972-39 : Television System I: A proposed specification for group delay at high video frequencies R.W. King, A. Brown The specification described is based on the results of subjective tests in which particularly critical still pictures were subjected to group delay variations at frequencies above the colour subcarrier. Large variations can be tolerated towards the top of the band: there is little impairment when the delay rises from nearly zero at 4.4 MHz to 1.1 microseconds at...
Topics: delay, impairment, pulse, distortion, chrominance, grade, subcarrier, specification, subjective,...
From the bitsavers.org collection, a scanned-in computer-related document. national :: appNotes :: AN-0774
Topics: filter, impedance, frequency, capacitors, resistor, input, channel, bandwidth, output, analog,...
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 1978-20 : Narrow-band f.m. system for television links: a feasibility study. R.Storey The use of fm television links at uhf (Band-V) depends, at present, upon the availability of a number of adjacent 8 MHz broadcast television channels to accommodate the 16 MHz bandwidth occupied by the transmitted signal. Because of the expansion of the uhf transmitter network, fewer spare sets of contiguous channels are expected to be available. To overcome this difficulty, it was proposed that...
Topics: mhz, bandwidth, frequency, spectrum, differential, distortion, signal, subcarrier, system,...
R&D Report 1984-04 : Filtering of the colour-difference signals in 4:2:2 YUV digital video coding systems. V.G. Devereux Specifications are proposed for the characteristics of the low-pass filters required at the input and output of the U and V channels of a 4:2:2 YUV digital video coding system. In such a system, the Y (luminance) signal is sampled at 13.5MHz and the U and V (colour-difference) signals are sampled at 6.75MHz as specified in CCIR Rec. 601. It has been concluded on both...
Topics: mhz, filters, digital, filtering, yuv, signals, frequency, filter, sampled, data, digital...
R&D Report 1973-35 : Visibility of chrominance/luminance delay inequality in System I (625-line PAL) video signals V.G. Devereux, G.C. Wilkinson An investigation, including subjective tests, has been carried out concerning the visibility of chrominance/luminance delay inequalities in System I (625-line PAL) video signals. The results obtained indicate that the threshold of visibility of this type of picture impairment corresponds to a delay inequality of about +/- 50ns on critical pictures...
Topics: delay, inequality, luminance, tests, subjective, grade, chrominance, impairment, lessman, timing,...
R&D Report 1976-18 : CEEFAX: Computer based time-domain and frequency-domain analysis of system responses to test pulses. M.G. Croll In the course of CEEFAX tests conducted in Germany, the IT pulse responses of systems and sub-systems were photographed. This report describes techniques developed to compute amplitude and phase responses in the frequency-domain derived from 1T waveforms, and to enable the responses of sub-systems to be calculated from the response at different points within a...
Topics: pulse, waveform, amplitude, errors, analysis, mhz, response, digitising, components, ceefax,...
Bell System Technical Journal, 53: 2. February 1974 pp 177-193. Delay Distortion in Generalized Lens-Like Media. (Miller, S.E.)
Topics: impulse, delay, fiber, distortion, distribution, response, transverse, fibers, versus, rms, group...
R&D Report 1955-10 : Some measurements on an EMI microwave link Type ML6B with particular reference to the BBC version of the NTSC colour television signal. A.V. Lord, R.V. Harvey, H.A.S. Philippart. The report describes a series of measurements carried out on a frequency-modulated television link, particular attention being paid to those characteristics which are of prime importance when the link is used with a colour signal of the N.T.S.C. type.
Topics: signal, link, frequency, luminance, test, waveform, colour, phase, amplitude, measurements, phase...
Bell System Technical Journal, 53: 2. February 1974 pp 305-331. Some Comparisons Between FIR and IIR Digital Fibers. (Rabiner, L.R.; Kaiser, J.F.; Herrmann, O.; Dolan, M.T.)
Topics: filter, elliptic, fir, digital, transition, equalized, optimum, filters, passband, iir, equalized...
R&D Report 1968-03 : The performance and specification of ultrasonic delay-lines for use in television broadcasting C.J. Dalton The principles of operation of ultrasonic delay-lines are described as far as is necessary to enable a realistic performance specification to be drawn up for delay-lines suitable for use in high-quality processing equipment for television applications. Methods of specifying the performance are suggested and indications of the limits imposed by present-day...
Topics: delay, transducer, frequency, ultrasonic, mhz, insertion, spurious, quartz, temperature,...
R&D Report 1972-36 : Digital video: Reduction of sampling frequency to 11.9 MHz A. Brown, R.W. King This report describes some of the problems involved in reducing the sampling frequency in 625-line television digital codecs from 13.3 MHz to 11.9 MHz. Such a reduction would enable a 9-bit coded signal to be transmitted within a serial bit rate of 107 Mb/s, instead of 120 Mb/s which is required for 13.3 MHz sampling. The sampling frequency of 11.9 MHz is still greater than the Nyquist...
Topics: sampling, frequency, filter, digital, interference, alias, signal, mhz, delay, codec, permissible...
R&D Report 1982-19 : Tests on eight video p.c.m. codecs in tandem handling composite PAL and monochrome video signals. V.G. Devereux The performance of up to eight video pcm codecs in tandem, each employing 8 bits per sample, has been examined by means of subjective tests and objective measurements. In the subjective tests, a sampling frequency of 12 MHz was employed for coding System I (625-line, 5.5 MHz) PAL colour and monochrome video signals. Conclusions are given regarding the minimum...
Topics: codecs, video, frequency, codec, signal, signals, mhz, sampling, quantising, subcarrier, group...
R&D Report 1957-01 : The subjective sharpness of television pictures. W.N. Sproson The subjective sharpness of television pictures has been measured using a comparison technique and a multi-criterion scale for assessment. Two types of degrading network were used and the subjective sensitivity to changes in equivalent rectangular bandwidth has been evaluated for both static and moving pictures. http://www.archive.org/editxml/bbc-rd-reports-1957-01
Topics: sharpness, picture, comparison, bandwidth, networks, liminal, observers, subjective, delay, factor,...
From the Frostbyte BBS shareware collection.
Topics: qckt, circuit, component, frequency, enter, analyzer, sweep, capacitor, mhz, impedance, quick...
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This paper deals with the synthesis and design of impulse response digital systems exhibiting negative group delay (NGD). It is demonstrated that under certain condition, certain first order FIR and IIR systems can provide the NGD function. Synthesis methods of NGD FIR/IIR transfer functions are introduced. Then, the basic properties specific to the NGD digital functions are established. To validate the theory proposed, NGD FIR and IIR systems were synthesized and implemented with Matlab. As...
Topics: negative group delay (NGD), FIR, IIR
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Instantaneous Frequency and Time-Frequency Distributions
Topics: monocomponent signals, multicomponent signals, time delay, group delay, chirp, time-frequency...
