DTRS HISTORY

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

DA-78HR Technical Documentation

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.

All 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.

THE 24 BIT ACHIEVEMENT

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 over time.

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.

BACKWARDS COMPATIBILITY

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 less.

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.

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

DA-78HR_TECHDOC.pdf

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Tascam DA-78HR specifications Dtrs History, BIT Achievement, Backwards Compatibility
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DA-78HR specifications

The Tascam DA-78HR is a professional digital audio tape recorder that has made a significant mark in the world of sound recording since its introduction. Known for its robustness, versatility, and exceptional sound quality, the DA-78HR is particularly appreciated in professional studios and live sound settings.

One of the standout features of the Tascam DA-78HR is its ability to record and playback at high resolution. It supports 24-bit/96 kHz audio, which allows for capturing intricate details in sound that standard resolution formats might miss. This high-resolution recording capability makes it ideal for critical audio applications, such as music production, film scoring, and broadcasting.

The DA-78HR offers an innovative 8-track recording system that enables simultaneous recording on up to eight tracks. This multi-track capability is essential for modern music production, where layering various instruments and vocals is a common practice. Additionally, the DA-78HR features a built-in mixer, facilitating the balancing of different audio levels during the recording process.

Another key characteristic of the DA-78HR is its use of Hi8 tape, which provides durability and a high level of reliability. The use of tape grants an analog warmth and character that many sound engineers cherish, contributing to the overall richness of the recorded audio. The DA-78HR can also be integrated into existing setups with ease, thanks to its comprehensive connectivity options, including AES/EBU digital I/O, analog I/O, and word clock asynchrony for precise synchronizations when working with other digital devices.

The Tascam DA-78HR also boasts user-friendly features such as intuitive operation, allowing professionals to focus on their creativity rather than getting bogged down by complicated setups. The onboard LCD display provides essential information at a glance, which aids in streamlined workflows.

In terms of storage, the DA-78HR excels with the capability to utilize standard Hi8 and Metal tape formats, giving users flexibility in media choice. Furthermore, its ability to batch erase and rewind tapes can significantly enhance production efficiency.

In summary, the Tascam DA-78HR stands out as an exceptional digital audio tape recorder, providing high-resolution recording, a robust multi-track system, diverse connectivity options, and user-friendly operation. Its combination of advanced technology and practical design makes it a valuable instrument for anyone involved in the demanding world of audio recording.
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