Rare Vintage Dolby B - C - S - NR Model 422 Reference Encoder/Decoder Hard To Find
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| Reference Number: Avaluer:31086697 |
Works perfect, only used in non smoking pro studio. Rare Vintage Dolby B-C-S-NR Model 422 Reference Encoder/Decoder Hard To Find. Condition is Used. Dolby 422 encoder decoder The Dolby® 422 is designed primarily for encoding running masters for audio and video tape duplication, and for decoding recordings for quality assessment monitoring.Channels 1 and 2 operate either as encoders or decoders (depending on the position of an internal jumper), while channels 3 and 4 operate as decoder...s only. Front-panel toggle switches select the noise reduction (NR) type for each pair, indicated by LEDs. The 422 can simultaneously decode four channels; simultaneously encode and decode one pair of channels with the same NR type; or encode one pair of channels with one NR type while simultaneously decoding with another. The latter function, for example, allows checking Dolby S-type encoded material for compatibility with Dolby B-type playback.A built-in signal generator provides calibration Dolby tones, with audible characteristics identifying the type of NR processing in use. The generator is activated by the setup switch on the front panel, and the LED calibration displays allow accurate adjustment of reference levels. In addition, each channel has an overload LED to warn of the onset of distortion in the recording medium.The 422 normally contains a plug-in 16 kHz lowpass filter suitable for use in duplication of audio cassettes. For video applications, this should be replaced by a filter with a notch at television horizontal frequency
Controls and IndicatorsPush-button switches for setup, bypass, NR in/out; toggle switches for NR type; input/output trim controls, adjustable ±10 dBr for Dolby level; LED indicators for NR type, calibration, signal presence, and peak level (user-adjustable threshold)InputsXLR connector for each channelInput circuits electronically balanced, 20 kΩ substantially resistive; common- mode rejection >55 dB (50 Hz to 10 kHz); maximum input level +27 dBr (balanced), +21 dBr (unbalanced)OutputsXLR connector for each channelOutput circuits electronically balanced andfloating, output impedance approximately 20Ω; output balance within 1 dB into symmetrical 600Ω load; output float1 better than –40 dB (50 Hz to 1 kHz); maximum level into 600Ω or higher, +26 dBr (balanced) or +21 dBr (unbalanced); either leg of the output may be grounded for unbalanced operation with no change in levelRemote Control15-pin female D-connectorProcessor Loop9-pin male D-connector with break points for each channel at a normalized level of –6 dBrSignal ProcessingFour channels of switchable Dolby B-, S-, and C- type NR; NR process for each pair of channels (1/2, 3/4) selected by front-panel toggle switches, and indicated by LEDs (red for B-type, yellow for C-type, green for S-type)Channel ModesChannels 1 and 2: internally selectable as decode or encode pair; mode indicated by front-panel LEDsChannels 3 and 4: decode onlyProcessor HeadroomMore than 15 dB above Dolby level2Frequency Response(with Input Filter Bypassed)220 Hz to 15 kHz, ±2 dB; encode/decodeat any levelS-type ±1 dB, B-type ±1 dB, C-type ±2 dBOverall Harmonic Distortion2 0.2% maximum at Dolby levelOverall Dynamic Range2≥96 dB, clipping level to CCIR/ARM noiseInterchannel Crosstalk2Channels 1 and 2 as encoders feeding channels3 and 4 as decoders:
Controls and IndicatorsPush-button switches for setup, bypass, NR in/out; toggle switches for NR type; input/output trim controls, adjustable ±10 dBr for Dolby level; LED indicators for NR type, calibration, signal presence, and peak level (user-adjustable threshold)InputsXLR connector for each channelInput circuits electronically balanced, 20 kΩ substantially resistive; common- mode rejection >55 dB (50 Hz to 10 kHz); maximum input level +27 dBr (balanced), +21 dBr (unbalanced)OutputsXLR connector for each channelOutput circuits electronically balanced andfloating, output impedance approximately 20Ω; output balance within 1 dB into symmetrical 600Ω load; output float1 better than –40 dB (50 Hz to 1 kHz); maximum level into 600Ω or higher, +26 dBr (balanced) or +21 dBr (unbalanced); either leg of the output may be grounded for unbalanced operation with no change in levelRemote Control15-pin female D-connectorProcessor Loop9-pin male D-connector with break points for each channel at a normalized level of –6 dBrSignal ProcessingFour channels of switchable Dolby B-, S-, and C- type NR; NR process for each pair of channels (1/2, 3/4) selected by front-panel toggle switches, and indicated by LEDs (red for B-type, yellow for C-type, green for S-type)Channel ModesChannels 1 and 2: internally selectable as decode or encode pair; mode indicated by front-panel LEDsChannels 3 and 4: decode onlyProcessor HeadroomMore than 15 dB above Dolby level2Frequency Response(with Input Filter Bypassed)220 Hz to 15 kHz, ±2 dB; encode/decodeat any levelS-type ±1 dB, B-type ±1 dB, C-type ±2 dBOverall Harmonic Distortion2 0.2% maximum at Dolby levelOverall Dynamic Range2≥96 dB, clipping level to CCIR/ARM noiseInterchannel Crosstalk2Channels 1 and 2 as encoders feeding channels3 and 4 as decoders:
