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Technical Documentation 


The DTRS format has long been respected as the most 
reliable format in digital recording, and now the DTRS 
format is leading the way into high resolution 24 bit 
recording. The DA-78HR works with 16 bit DTRS 
machines, using the same DTRS Sync line for sample 
accurate lock plus the ability to read and write the 
older 16 bit format. However, the DA-78HR offers the 
ability to write 8 tracks of 24 bit audio to tape in the 
HR format, built in SMPTE synchronization, MIDI ports 
for MTC and MMC, plus a built-in 8 channel digital 
mixer for internal bounces or monitor mix generation. 

• Records 8 tracks of 24 Bit Audio To Hi8 Tapes 

• 24 Bit A/D and D/A Converters 

• >104dB Dynamic Range 

• 108 Minutes of Record Time on 120 Hi8 Tape 

• SMPTE Time Code Generation and Chasing 

• Generates MIDI Time Code 

• Responds to MIDI Machine Control 

• Reads and Writes 16 and 24 Bit DTRS Tapes 

• 16 Machine Sample Accurate Lock with DTRS Sync 

• Balanced DB25 & Unbalanced RCA Analog I/O 

• TDIF Digital I/O & SPDIF Digital I/O 

• Word Sync In/Out/Thru 

• Track Slip from -200 to +7200 Samples 

• Built-In 8 Channel Digital Mixer 



The DA-78HR's high audio quality, long record time, rugged 
reliability, built-in time code capabilities, built-in MIDI 
capabilities, and affordable price combine into a product that 
can handle numerous situations. 

Personal and Project Studios 

Maximum features, minimum hassle. The DA-78HR brings 
DTRS tape into 24 bit audio, offering the very best sound 
quality available today. New features like built in MIDI ports 
and SMPTE synchronization gives you the ability to chase other 
tape machines (analog or digital), and the ability to work with 
sequencers and digital consoles. For the ultimate cost effective 
flexibility without having to locate additional accessories, the 
DA-78HR is the best digital tape machine for the market. 

Live Performance and Recording 

In live performance, there is no take 2. Whether you are 
using the DA-78HR to play some additional backing tracks or 
recording the performance live, you can count on the DA-78HR 
to get it right the first time. With 108 minutes of record time 
on a single tape, you can put a whole live song set on a single 
tape; no need to stop everything so you can switch tapes. 

Audio for Video on a Budget 

For anyone trying to make music for television or film, the 
DTRS format is the de-facto standard format for transfers 
and many stages of recording. The synchronization features 
will allow you to chase another audio machine, or a video deck. 
Again, the 108 minute record time was maintained for the new 
24 bit recording mode, allowing 1 hour reels to be stored on a 
tape, along with reference tones and the independent subcode 
time code track. More advanced video applications will want 
a DA-98HR, which adds 9 pin control, blackburst resolve, and 
built in bit split for higher resolution audio recording. 



Recording Method: 
Tracking Method: 
Maximum Record Time: 
Time to Play from Stop: 
Shuttle Speeds: 


SMPTE Frame Rates: 
Error Correction: 

Rotary Head / Helical Scan 
ATF (Automatic Track Finding) 

108 min (using P6-120 tape) 

< 2 seconds 

8x, 4x, 2x, lx, 0.5x, 0.25x 

Independent ABS and SMPTE TC 
30fps, 30dfps, 29.97fps, 29.97dfps, 
25fps, 24fps 

Double-encoded Reed-Solomon code 

Frequency Response: 
Signal to Noise Ratio: 
Total Harmonic Distortion: 
Channel Separation: 

Sampling Frequency: 
Recording Resolution: 
Reference Level: 
Crossfade Time: 

Track Delay: 

Word Sync Source: 

A/D Converters: 

D/A Converters: 

Analog Inputs: 

Analog Outputs: 

Digital I/O: 

Time Code In: 

Time Code Out: 
Word Sync In/Thru: 
Word Sync Out: 
Punch In Port: 

20Hz-20kHz ±0.5dB 
>104dB (HR), >100dB (Standard) 
<0.004% (HR), <0.005% (Standard) 
>90dB @ 1kHz 

44.1kHz, 48kHz 
16 bit, 24 bit 
-16dB (full bit) 

10ms to 200ms (10ms increments) 

-200 to +7200 samples 
(set in samples or msec) 

Internal, Word, SPDIF 

24 bit, 128x oversample (selectable dither) 

24 bit, 128x oversample 

DB25, +4dBu, 20kOhm 
(8x) RCA, -lOdBV, lOkOhm 
DB25, +4dBu, lOkOhm 
(8x) RCA, -lOdBV, 250 Ohm 
TDIF-1 Format, RCA Coaxial SPDIF 
DTRS Sync DB15 

RCA, 0.5Vp-p to lOVp-p, lOkOhm 

RCA, 2Vp-p, lOOkOhm 

Auto Terminating BNC, 75 Ohm (TTL) 

BNC, 75 Ohm 
In, Out, Thru 

1/4" phono (For TASCAM RC-30P) 

Dimensions: 482x143x350mm, 19" x 5.6" x 13.8" 

Weight: 8.1kg, 17.8 lbs 

Power Requirements: USA/Canada 120VAC, 60Hz 

UK/Europe 230VAC, 50Hz 
Australia 240VAC, 50Hz 

Power Consumption 34W 

Electromagnetic Environment: E4 

7733 Telegraph Road • Montebello, CA 90640 • (323) 726-0303 • 
All features and specifications are subject to change without notice. Contact your local TASCAM representative for the latest information. 

Page 1 of 3 




DA-78HR Technical Documentation 


Ever since the introduction of the DA-88 in 1992, users of 
all levels have been using DTRS machines to create, mix, 
and transfer their tracks at home and between studios. The 
DTRS standard has become renowned for top quality sound, 
top notch reliability, and the fastest transport and machine 
lock in the business. 

The DA-88 was originally intended for the music market, 
but since it was so full featured, it also found its way into 

TASCAM's DA-88, the original DTRS format recorder 


When the 24 bit DTRS format was announced, most users 
were curious about how we did it. 24 bit audio requires 
50% more data than the original 16 bit format, yet the 
DA-78HR didn't cut back on tracks or record time. Many 
assumed that the 24 bit format would have been less 
reliable since more information is written in a smaller 
space. Well, actually the 24 bit format is even more 
reliable. Here's why: 

When digital information is written to tapes, it isn't like 
writing a bunch of ones and zeros on a piece of paper. All 
the data passes through an encoder and decoder (codec) 
when going to and coming from tape. The coding process 
utilizes a lossless algorithm allowing a larger amount of 
data to be stored in the same amount of space. 

The original DTRS format utilized a codec based on the 
8-10 Modulation Principle used by most all DAT recorders. 
This format has been around for almost two decades; more 
efficient encoding schemes have been developed overtime. 

High resolution DTRS machines utilizes the 1-7 RLL (Run 
Length Limited) codec commonly used in hard drive and 
DVD technologies. This format is 66% more space efficient 
than the codec used in the original DTRS machines. Since 
only 50% more data was needed to store the audio itself, 
the other 16% was dedicated to additional data verification 
beyond the original DTRS machine. 

So, the 24 bit DTRS machines do not reduce the print size. 
The write area is actually about the same size. The 24 bit 
machine utilizes a better codec which offers more efficient 
use of the space, as well as increased reliability through 
more accurate data verification processes. 

major television and motion picture studios. The DTRS 
format has long been the standard format to move audio 
from one studio to the next, due to the affordable nature 
of the machine and media, as well as the high audio 
quality. In addition, a number of studios have been using 
DA-88s to expand their track count by having the DA-88 
chase analog machines, or other digital formats. 

With the introduction of the DA-38 and DA-98 in 1996, 
the DTRS machines added some new features like a 
digital patchbay, test tone oscillators, and an even faster 
transport than the original DA-88. Still, the DA-88 had 
made such an indelible mark on the industry that it's 
production was continued by popular demand into the 
year 2000. 

The DA-78HR and DA-98HR are following in the footsteps 
of its heritage, continuing the traditions established and 
attested to over the years at a new standard - 24 bit. 

Ail in all, the DTRS machines give you the best sound, 
the most flexibility, and tried and true reliability that has 
been proven for almost a decade. 


When the high resolution machines were designed, the 
ability to work with the original 16 bit machines like 
DA-38s, DA-88s, and DA-98s was a high priority. 

Sync Chain 

High resolution DTRS machines use the same DTRS 
Sync line that the previous machines used. So, you 
can lock any combination of 16 bit machines with 
24 bit machines sample accurately in 2 seconds or 

Audio I/O 

The new high resolution DTRS machines use the same 
DB25 plugs for balanced audio, and TDIF lines for 
transfers and integration into digital studios. This 
means if you are trading out 16 bit machines for 24 bit 
machines, there are no new cabling requirements. 

Tape Format 

The DA-78HR can read and write 16 bit format tapes, 
allowing HR users to seamlessly work with owners of 
older DTRS machines. However, 24 bit tapes created 
on a high resolution DTRS machine will only work on 
other high resolution DTRS machines. 

Time Code Track 

In addition to the 8 tracks of audio, DTRS machines 
can handle two separate time tracks in subcode of the 
tape. One of the tracks is the tape's absolute time, 
and the other is an independent SMPTE time code 
track. The high resolution DTRS machines can read 
and write this SMPTE time code track in both 16 bit 
and 24 bit format, so you can continue working the 
same way you are used to working. 

0 7733 Telegraph Road • Montebello, CA 90640 • (323) 726-0303 • 

All features and specifications are subject to change without notice. Contact your local TASCAM representative for the latest information. 

Page 2 of 3 




DA-78HR Technical Documentation 



The analog DB25 pinout on the DA-78HR is the exact same 
as on the other DTRS machines. While these cables are 
readily available in your local retail outlets, the pinout is 
listed here for users wishing to make custom cables and 



G = Ground 
H = Hot(+) 
C = Cold (-) 

The DA-78HR displays TASCAM HR across the meters 
when it first boots up. For users who want to customize 
their recorder, this message can be changed to display 
your name, the name of your studio, or anything else. 

1) Turn the power on. 

2) Press SHIFT so the SHIFT LED lights 

3) Press HR MODE and MENU a few times until the counter 
displays "mAintn2". 

4) Press SUB MENU to advance to "mSGEdit" The counter 
will display "1. T" (T will scroll through the meters.) 

5) Press the UP and DOWN arrows to change the letter. 
(Some letters cannot be displayed In the counter, but 
will show up in the meters.) 

6) Press SHIFT and UP to advance to the next letter. 

7) Select "End" from the characters to end your message. 
Advancing one more time will display "PrEViEw" in the 
counter as your new message scrolls. 

8) Press SHIFT to finish. 


man M&oumeoo 

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TASCAM 7733 Telegraph Road • Montebello, CA 90640 • (323) 726-0303 • Page 3 Of 3 

All features and specifications are subject to change without notice. Contact your local TASCAM representative for the latest information. DA 78HR - TECHD o °c-P o d o f