Nobutaka Amada

A home-use digital VCR with high density modulation method

A 8-12 channel coding (modulation) method suitable for high-density recording for a home-use digital video cassette recorder (VCR) was developed. An areal recording density of 2.3 mu m/sup 2//b can be achieved by this 8-12 modulation method. A signal-to-noise ratio of 24.2 dB and a symbol error rate of about 1*10/sup -4/ were obtained experimentally on the tape-head simulator for current metal evaporated tape. >

Receiver for DBS With Digital Audio Signals

The Direct Broadcasting Satellite (DBS) service has just started in Japan. The digital audio signals, which provide higher fidelity sound than FM broadcasting, are directly transmitted to homes by the satellite BS-2 with low noise, ghost free video signals.

Blu-ray Disc 6x read/write control LSI with an adaptive PRML detector

A 6times-speed BD and all DVD/CD read/write control LSI has been developed. It contains a PRML detector that adopts an adaptive equalizer and an adaptive Viterbi decoder to improve playback performance. As a result of BER measurements, a large margin sufficient for playing back 6times BD was obtained.

A Study On The Digitization Of Audio Signals For S-VHS VCR

The recording and reproducing characteristics of the PCM (pulse code modulation) audio signal, reduction of interference to the video signal by the PCM audio signal, and performance against tracking error have been studied on a digital audio system for S-VHS VCR (video cassette recorder). A block error rate of 5*10/sup -4/ is attained without degradation of both video and FM audio signals. Amorphous heads have been used for both video and audio heads and the PCM signal carrier-to-noise ratio of 19 dB in the EP mode has been obtained without degradation of the video signal. It is confirmed that the uncorrectable error rate is under 1 symbol/second even in the case of a tracking error of -20 mu m to 9 mu m in the EP mode. >