The Alesis ADAT digital multi-track tape recorder is an iconic piece of early 1990s audio recording equipment.
ADATs used consumer S-VHS video tape to record up to 8 tracks of digital audio.
They were modular, meaning that each machine could be synched with up to 15 other ADA
T machines. It was therefore possible, in theory, to create a home recording studio with capacity to simultaneously record 128 tracks of audio, a process known as ‘mega-tracking’.
Similar to other early digital audio technology such as PCM 7030 and DAT, ADAT utilised recording methods originally developed for analogue video tape.
In analogue video the use of helical scanning and rotating recording/ playback heads was the means to produce the larger bandwidth necessary to capture the analogue video signal.
Helical scanning was logically re-purposed for recording digital audio because it similarly requires substantial bandwidth (the original ADAT recorded at a sampling rate of 48 kHz/ 16 bits).
Recording revolution
According to George Petersen ‘the Alesis ADAT changed the entire recording industry, beginning a revolution of affordable recording tools. Overnight, the cost of digital studio recording plummeted from a sizeable $150,000 for the Sony PCM-3324 24-track to a relatively modest $12,000 for three ADATs at their original $3,995.’
Figures from the Audio Engineering Society suggest that ‘20,000 were sold in its first year from October 1992 to November 1993 and 80,000 sold by 1998.’
Sound studies scholar Jonathan Sterne argues that ‘ADATs were symbolic of the democratization of audio recordings and changes in the audio industry,’ facilitating ‘the rise of amateur recording and a whole “semi-professional” realm of small studios, often located in homes or other less-than-optimal acoustic spaces.’
ADAT at Greatbear
At Greatbear we receive relatively few ADAT recordings in comparison with analogue multi-track formats.
This may be because ADAT is ‘recently obsolescent,’ and for everyday reasons users of this technology have not got around to migrating their archive to digital files.
Like all early digital audio formats recorded on tape, however, ADAT raise specific preservation concerns.
As we have stressed before, tape-based digital recordings do not degrade gracefully. They are subject to catastrophic rather than moderate signal loss. If the original recording has errors that prevent the ‘smooth’ playback of the tape (e.g., from clogged heads or the presence of dust), or there is any kind of damage to the tape surface (scratches or mould), this will create irreversible drop outs within the preservation copy.
As an emergent format used by people with a range of technical expertise, it seems reasonable to expect ADAT recording practices to be a little unsettled and experimental. The physical strain on both tape and transport in a heavy production environment must also be considered (the shuttling back and forth of the tape mechanism), as this would have shaped the quality of the original recording.
In the Greatbear studio we have several ADAT machines (the Alesis M20, ADAT XT and ADAT LX20) ready to transfer your tapes.
We deliver transferred files as individual, synchronised track ‘stems’ and use ADAT ‘sync’ and optical cables to ensure an authentic born digital workflow.
Perhaps now is the time to remix that early digital multi-track masterpiece…
We are now used to living in a born-digital environment, but the transition from analogue to digital technologies did not happen overnight. In the late 1970s, early digital audio recordings were made possible by a hybrid analogue/digital system. It was composed by the humble transport and recording mechanisms of the video tape machine, and a not so humble PCM (pulse-code-modulation) digital processor. Together they created the first two-channel stereo digital recording system.
The first professional use digital processing machine, made by SONY, was the PCM 1600. It was introduced in 1978 and used a U-matic tape machine. Later models, the PCM 1610/ 1630, acted as the first standard for mastering audio CDs in the 1980s. SONY employee Toshitada Doi, whose impressive CV includes the development of the PCM adaptor, the Compact Disc and the CIRC error correction system, visited recording studios around the world in an effort to facilitate the professional adoption of PCM digital technologies. He was not however welcomed with open arms, as the SONY corp. website explains:
'Studio engineers were opposed to digital technology. They criticized digital technology on the grounds that it was more expensive than analogue technology and that it did not sound as soft or musical. Some people in the recording industry actually formed a group called MAD (Musicians Against Digital), and they declared their position to the Audio Engineering Society (AES).'
Several consumer/ semi-professional models were marketed by SONY in the 70s and 80s, starting with the PCM-1 (1977). In a retro-review of the PCM-F10 (1981), Dr Frederick J. Bashour explains that
'older model VCRs often worked better than newer ones since the digital signal, as seen by the VCR, was a monochrome pattern of bars and dots; the presence of modern colour tweaking and image compensation circuits often reduced the recording system's reliability and, if possible, were turned off.'
Why did the evolution of an emerging digital technology stand on the shoulders of what had, by 1981, become a relatively mature analogue technology? It all comes down to the issue of bandwidth. A high quality PCM audio recording required 1-1.5 MHz bandwidth, which is far greater than a conventional analogue audio signal (15-20KHz). While this bandwidth was beyond the scope of analogue recording technology of the time, video tape recorders did have the capacity to record signals with higher bandwidths.
If you have ever wondered where the 16 bit/ 44 Khz sampling standard for the CD came from, it was because in the early 1980s, when the CD standard was agreed, there was no other practical way of storing digital sound than by a PCM Converter & video recorder combination. As the wikipedia entry for the PCM adaptor explains, 'the sampling frequencies of 44.1 and 44.056 kHz were thus the result of a need for compatibility with the 25-frame (CCIR 625/50 countries) and 30-frame black and white (EIAN 525/60 countries) video formats used for audio storage at the time.' The sampling rate was adopted as the standard for CDs and, unlike many other things in our rapidly changing technological world, it hasn't changed since.
The fusion of digital and analogue technologies did not last long, and the introduction of DAT tapes in 1987 rendered the PCM digital converters/ video tape system largely obsolete. DAT recorders basically did the same job as PCM/ video but came in one, significantly smaller, machine. DAT machines had the added advantage of being able to accept multiple sampling rates (the standard 44.1 kHz, as well as 48kHz, and 32kHz, all at 16 bits per sample, and a special LP recording mode using 12 bits per sample at 32 kHz for extended recording time).
Problems with migrating early digital tape recordings
There will always be the risk with any kind of magnetic tape recordings that there won't be enough working tape machines to playback the material recorded on them in the future. As spare parts become harder to source, tapes with worn out transport mechanisms will simply become inoperable. We are not quite at this stage yet, and at Greatbear we have plenty of working U-matic, Betamax and VHS machines so don't worry too much! Machine obsolescence is however a real threat facing tape-based archives.
Such a problem comes into sharp relief when we consider the case of digital audio recordings made on analogue video tape machines. Audio recordings 'work' the tape transport in a far more vigorous fashion than your average domestic video tape user. It may be rewound and fast-forwarded more often, and in a professional environment may be in constant use, thus leading to greater wear and tear.
Those who chose to adopt digital early and made recordings on tape will have marvelled at the lovely clean recordings and the wonders of error correction technology. As a legacy format however, tape-based digital recordings are arguably more at risk than their analogue counterparts. They are doubly compromised by fragility of tape, and the particular problems that befall digital technologies when things go wrong.
'Edge damage' is very common in video tape and can happen when the tape transport becomes worn. This can alter the alignments of transport mechanism, leading it to move move up and down and crush the tape. As you can see in this photograph the edge of this tape has become damaged.
Because it is a digital recording, this has led to substantial problems with the transfer, namely that large sections of the recording simply 'drop out.' In instances such as these, where the tape itself has been damaged, analogue recordings on tape are infinitely more recoverable than digital ones. Dr W.C. John Van Bogart explains that
'even in instances of severe tape degradation, where sound or video quality is severely compromised by tape squealing or a high rate of dropouts, some portion of the original recording will still be perceptible. A digitally recorded tape will show little, if any, deterioration in quality up to the time of catastrophic failure when large sections of recorded information will be completely missing. None of the original material will be detectable in these missing sections.'
This risk of catastrophic, as opposed to gradual loss of information on tape based digital media, is what makes these recordings particularly fragile and at risk. What is particularly worrying about digital tape recordings is they may not show any external signs of damage until it is too late. We therefore encourage individuals, recording studios and memory institutions to assess the condition of their digital tape collections and take prompt action if the recorded information is valuable.
The story of PCM digital processors and analogue tapes gives us a fascinating window into a time when we were not quite analogue, but not quite digital either, demonstrating how technologies co-evolve using the capacities of what is available in order to create something new.
