JVC AE-900V
A rack-mounted editing brain that turned a VCR into a digital multitrack - and demanded you speak fluent timecode to use it.
Overview
The AE-900V isn't a recorder. It's the control console and editing brain of JVC's DAS-900 Digital Audio Mastering System, a professional rig that stored 16-bit linear PCM audio on videotape and let engineers cut it with a precision tape splicing could never touch. The core of the system was the VP-900 digital audio processor, which interfaced with a professional VHS or U-matic VCR to provide up to two hours of digitally recorded audio. JVC's own advertising in Recording-Engineer (November 1988, p.31) said a 75-minute CD was "no problem." The AE-900V was the piece that made that stored audio editable.
The editor is a two-part device: the electronics and a separate keyboard, connected by two multi-way cables with locking connectors. The electronics and the rest of the system's sections are 17 inches wide, so they slot into a standard 19-inch rack with all connections at the rear. Signal goes through multiway locking connectors and BNC sockets. Power goes through IEC connectors sitting next to re-settable circuit breakers. A removable front panel reveals electronics on good-quality horizontal circuit boards with clear component identifications. The editor's only front-panel control, per one contemporary teardown, is the power on/off switch.
Editing was the point. The AE-900V offered three edit modes - manual, auto scanning, and address editing - with cut-in/out point confirmation, variable-gradient crossfade, and an auto-location function. Mix (November 1988, p.155) called it "simplicity itself to operate," putting editing "right in the hands of the artist," and noted precision to within microsecond accuracy. The shift function nudged edit points backward or forward in 2-millisecond steps for fine adjustment. Crossfading was variable in 0, 10, 20, and 40 microsecond gradients for smooth continuity at the edit point. Digital fade control adjusted relative levels between original and master tape. The auto tape locate function found a desired address on the original tape automatically.
The timecode is where the AE-900V gets fussy. The system did not use SMPTE timecode natively. It ran on a bi-parity (BP) timecode tied to the signal data format on tape. To bridge the two, JVC paired the editor with the TC-900V Time Code Unit, which reads and generates SMPTE standard timecode and synchronizes the JVC-exclusive BP timecode, so the DAS-900 could work with both. The TC-900V handled SMPTE and BP generation for dubbing, and could accept external SMPTE and output both formats. It did not handle drop-frame code. A further synchronizer, not part of the editor itself, converted incoming EBU timecode into BP timecode and locked the digital audio VCR to it, handling both NTSC and PAL. The FC-900 bi-directional interface allowed audio transfer between the JVC system and the Sony format used in the 1600/1610 units.
There's a regional catch built into the system. The VP-900 processor was restricted to the NTSC video standard, requiring an NTSC-type recorder and an NTSC television monitor to view data from tape. The audio was coded 16-bit linear with sampling frequency switchable between 44.1 kHz and 44.056 kHz. The latter was essential when working with composite syncs where audio is associated with video systems. Pre-emphasis could be set to 50 µs plus 15 µs, giving a 3 dB boost at 3.183 kHz, standard for many broadcast systems. The 15 µs time constant rolled off the boost at 10.61 kHz, for a maximum of about 8.6 dB near the system's upper limit around 20 kHz. It could also be switched out for flat response at all levels.
On performance, the accuracy of edit points was judged far better than conventional methods, with the added advantage of fading in and out while editing. The same review noted the VP-900's powerful error correction fully corrected normal tape dropout without interpolation. No uncorrected errors were heard or seen, and intentionally corrupting the replayed video to produce hold errors had no significant audible effect before the machine muted at excessive error rates. The one complaint was setup: the large number of controls on the video cassette recorders made initial configuration complicated, though none were needed during operation.
The AE-900V sat in a big family of components: the DS-DM900 digital mixer, RM-900 remote control, DS-FC901 digital interface, DS-SU900 A/V synchronizer, DS-DA900 tape analyzer, and DS-LC900 limiter/compressor/equalizer all appear alongside it in the system literature.
The AE-900V is a system component, not a standalone unit. It is useless without a VP-900 processor and an NTSC VCR to feed it, and the timecode dependencies - BP format, the TC-900V, the NTSC restriction - mean a working setup requires several pieces. Studio Sound found it accurate and pleasant to drive once configured. Setup was the hard part in 1986.
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