A 4-error correcting Reed-Solomon decoder LSI is presented. The LSI achieves following features: (1)reduction of miss-correction caused by synchronization error, (2) reduction of miss-correction in erasure correction.
We have studied on the reproduced picture quality in the variable speed mode of the digital VCR by using a bit rate reduction with a DCT. This paper describes some results obtained by a computer simulation and a data processing method to realize an acceptable reproduced picture quality in the high speed playback.
We have newly developed an experimental digital VCR with small drum diameter, 26.7mm, by taking account of high density recording, cassette exchangeability, and the ability of multispeed playback. The VCR uses an overwrite recording technique without erasure heads, and a newly developed waveform equalizer for the reproduced signal, to achieves a recording density of 2.45μm^2/bit. During multispeed playback, a sufficient data acquisition rate is obtained to employ AGC (Automatic Gain Control) for the reproduced signal.
An HDTV digital video cassette recorder has been experimentally developed, using a 3/4-inch MP tape. This VCR can record 64-minute HDTV signal with 8 channel PCM audio signals at 2 times higher recording density than that of the current HDTV digital VTRs. This VCR is expected to be widely used as an HDTV program production equipment because of excellent picture quality, easy handling and lower operation/maintenance cost. Both improved tape to head contact realized by a newly designed drum structure and development of wideband-amplifier ICs permitted to realize such high density recording.