Sony PCM-1610
Two racks of digital conversion that turned a video deck into a mastering recorder - and made the CD possible.
Overview
The PCM-1610 was not a tape machine. It was a processor. It took analog audio, converted it to 16-bit digital, and packed the resulting bitstream into a pseudo-video signal with vertical and horizontal syncs so a videocassette recorder could store it. That is the whole trick, and it puts the PCM-1610 in the era of the 3/4-inch U-matic, not the era of the DAT deck. Sony's own manual describes the unit as "basically designed as a signal processor that converts analog signals into digital, then into pseudo-video signals including vertical and horizontal syncs." The VTR did the recording. The PCM-1610 did everything else.
The payoff was headroom that analog tape could not touch. The manual claims a dynamic range greater than 90 dB, roughly 30 dB better than the best analog tape recorders of the period, and credits 16-bit A/D and D/A converters running one per channel. Frequency response is specified as flat within +0.5 dB and −1 dB from 20 Hz to 20,000 Hz. Harmonic distortion is never worse than 0.05 percent, and wow and flutter are too low to measure. That last one is not a marketing trick. The processor's short-term memory re-clocks the data against a reference clock before release, which is why the manual can say wow and flutter and modulation noise are effectively absent. There is no capstan to drift and no tape path to scrape.
The numbers are the easy part. The harder part, and the reason the PCM-1610 became the de facto standard for early digital mastering, is the interfacing. It carries the same input and output specifications and connectors as professional videocassette recorders, with BNC connectors for the video-domain connections and balanced XLR connectors for analog. It offers two built-in sampling frequencies and a serial digital input/output format. The manual is explicit that this makes it interchangeable with the PCM-100, another of Sony's professional digital audio processors, and able to reproduce programs recorded on the PCM-1600. For a mastering house already invested in U-matic hardware, that compatibility was worth more than any single spec on the sheet.
Two features show how seriously Sony took the professional market. The first is the metering: 24 LED segments per channel arranged vertically, with an expanded scale of five segments in 0.2 dB steps straddling the 0 dB mark for precise level setting. That resolution counts when a digital overload is unrecoverable. The second is the built-in SMPTE time code generator, which let program content be addressed precisely on tape. The code could be written to the time code track of the videocassette or to either audio track, and Sony provided two separate output connectors, BNC and Cannon XLR, to feed it. Add the Cross Word Codes error correction and the dropout protection is strong, though the manual notes that dropouts are already unlikely when the unit is paired with Sony's own digital audio recorder and quality videocassette stock.
Editing was handled by pairing the PCM-1610 with the DAE-1100 digital audio editor and a pair of digital audio recorders. Together they formed a fully electronic digital editing system with edit accuracy of 363 microseconds, the equivalent of 16 words at the PCM-1610's word rate. For less demanding work, Sony notes that the ordinary BVE-800 video editing console could substitute for the DAE-1100. The processor can also be locked to an external sync, either the NTSC composite sync from a video source or the sampling clock from another digital audio processor. That let it sit inside a studio's existing video infrastructure rather than alongside it.
The period press covered both the capability and the cost. Mix-Magazine (May 1981, p.27) noted that the PCM-1610 had been sold in conjunction with the BVU-200B U-matic recorder, a machine with a proven track record in video electronic news gathering and full editing capability, running at a tape speed of 3¾ i.p.s. on standard ¾-inch U-matic cassettes. Recording-Engineer (August 1986, p.35) was blunter about the economics. The system provided two-hour capability only with a 1-inch VTR, since two hours or more was not possible on ¾-inch U-matic and the process was not sufficiently reliable on ½-inch VCRs. The same piece put a typical 1-inch VTR and time base corrector combination at no less than $50,000, and observed that adding a second VTR to ease dubbing of masters made the whole thing a substantial investment. It was never a consumer product.
By the mid-1980s the PCM-1610 was embedded deeply enough in the industry that its name shows up in format tables. Recording-Engineer (April 1984, p.40) listed Toshiba/EMI, Polygram, and Matsushita among the operations running PCM-1610 systems for CD transfer work, with Sony and Matsushita using their own PQ code implementations. A significant share of early compact discs passed through this processor on their way to the pressing plant.
Owning one takes some planning. The PCM-1610 is a processor, not a recorder. Without a working VTR, the U-matic cassettes, and the interconnect cabling, it does nothing at all. The emphasis on BNC and XLR connectivity marks it as rack equipment built for a machine room, not a shelf. Documentation is a real asset here. The operating manual runs through block-diagram-level detail on pre-emphasis, anti-aliasing filtration, interleaving, time-axis compression, and the de-interleaving and dropout compensation on playback, and that makes restoration of a forty-year-old professional converter feasible rather than hopeless. The 24-segment meters and the SMPTE generator are the features that still read as luxury today. The dependence on a functioning video transport is what will keep most of these units parked.
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