New 2-frame DCT coding schemes in consideration for requirements of consumer-use HD digital VCR are studied. One is a motion adaptive intra 2-frame DCT coding scheme and another is a 2-frame MC-DCT coding scheme. Each coding scheme shows higher coding efficiency than the intra-frame DCT coding scheme. With computer simulation, it is confirmed that the 2-frame MC-DCT coding scheme has better performance than the motion adaptive intra 2-frame DCT coding scheme. It shows small dependencies on image characteristics and its S/N gain compared to the intra-frame DCT coding scheme is about 1-2dB. Simulation results of MPEG-2 coding scheme are also shown.

View full abstract

A digital advanced TV(ATV) standard for terrestrial broadcasting is now under consideration by FCC in the U.S.A. We have developed a consumer use VCR which has capability to record and Play back the data of DigiCipher^<TM> that is proposed as one of ATV by General Instrument Corp.. This VCR has a format-converter changing the VCR's format to the DigiCipher's. Because it is going to be possible that this VCR utilizes easily the multiple standards of broadcasting. And that is one of the solutions to realize the trick-Play. This paper describes two points. one is the details and the features of this VCR, and the other is the considerations on the digital VCR with trick play-using at MPEG.

View full abstract

This paper describes the relationship between tape speeds and picture quality in shuttle mode, which is one of the most important features in consumer digital VCR. The optimum tape speeds for different kinds of head configurations are studied. An acceptable picture quality in shuttle mode has been achieved by the computer simulation.

View full abstract

Relation between search speed and picture quality has been investigated and coded video data have classified under hierarchy according to the order of priority by using computer simulation method. The coded video data then are arranged on the common areas of a simulated magnetic tape area, which should be reproduced with various different search speeds. As a result, high quality pictures has been reproduced from the tape areas with several search speeds without increasing video data for high speed search.

View full abstract

Digital Betacam is newly developed multi purpose component VTR. It realized upper replay compatibility with Analog Betacam which is widely used at the broadcast and industrial area in the world. It enabled low cost tape/head system with high quality component digital recording by the introduction of many newly developed techniques such as Bit Rate Reduction for video and new tracking system.

View full abstract