SHARP/OPTONICA RX-1
¥ 590,000 (around 1979)
Commentary
A PCM digital audio adapter developed using Sharp's LSI technology.
PCM was originally put into practical use as a means of communication in space. The RX-1 uses a home VTR to record and reproduce audio signals in the video signal band.
In PCM recording, audio signals are converted into 1 and 0 digital signals and recorded. The music flow for one second is divided into 44,056 pieces, and the loudness of each piece is subdivided into 16,384 levels (14 bits).
In order to prevent signal loss caused by high-density recording, we have developed and adopted an error correction method that inserts correct data of the original sound, so that even if an error occurs, it can be corrected by 99.995%.
The optimal control allows you to select the optimum matching point for the VTR to be used.
You can check the occurrence of signal loss with headphones.
Equipped with a peak level meter by LED.
Equipped with cannon connector and M-type connection terminal.
Equipped with various indicators for recording and playback.
Equipped with digital direct dubbing terminal.
Model Rating
| Type | PCM Digital Audio Adapter |
| Connected VTR | VHS system, Betamax system, U-matic system, others |
| Frequency characteristic | 2 Hz to 20 kHz |
| Dynamic range | 90dB |
| High frequency distortion factor | 0.03% (1 kHz) at maximum level |
| Wow and flutter | Below the measurement limit |
| Standard | Based on technical standards of the Electronic Industries Association |
| Recording system | PCM with NT servo control system TV signal |
| Number of transmission channels | 2 Channel |
| Sampling frequency | 44,056kHz |
| Number of quantization bits | 14-bit equivalent |
| Data transfer rate | 2.643Mbps |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 80W |
| External dimensions | Width 430x Height 141x Depth 360 mm |
| Weight | 15.5kg |