Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1998-02-06
2000-11-14
Garber, Wendy
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386131, 348441, H04N 591
Patent
active
06148136&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a digital interface for transmitting/receiving high-efficiency encoded digital video signal, etc. with each other among the recording/reproducing apparatuses, such as digital VCR, which record and reproduce high-efficiency encoded digital video signal, etc.
BACKGROUND ART
The digital interface is a data transmitting means in a recording/reproducing apparatus such as VCR. Among said recording/reproducing apparatuses is a consumer-use digital VCR which records/reproduces high-efficiency encoded video data and non-compression voice data stored in a compact cassette, called the DV Format. The DV Format is described in the consumer-use VCR specifications introduced by The HD Digital VCR Conference (Data Compression and Digital Modulation, The Consumer-use Digital VCR;--consolidating, as a first step, the existing specifications of TV signals", pages 137-150, NIKKEI ELECTRONICS BOOKS). Also there is a report available on the digital interface of the DV Format (Digital Interface for Digital VCR", VIR95 - 56, Technical Report of The Institute of Television Engineers of Japan), which refers to the transmission of compressed video data and interleaved audio data in the DV Format using the IEEE1394 (hereinafter referred to as 1394). The format for transmitting digital data using the 1394 is called AV Protocol; in the digital VCR specifications, video data and audio data etc. on a tape are transmitted as the line of 80-byte block data called DIF block. In a case of the 525 scanning line/60 field" (hereinafter referred to as 525/60 system) signal, for example, 150 DIF blocks form 1 DIF sequence, 10 DIF sequences form 1 video frame, as shown in FIG. 10. In the following, a conventional digital interface for connecting a DV Format VCR with an outside equipment is described.
FIG. 11 is a block diagram of a conventional recording apparatus, which diagram shows the structure of a digital VCR using the 1394 digital interface. In FIG. 11, numeral 1 denotes an input terminal of the 1394 digital interface signal, 2 is a digital interface circuit (hereinafter referred to as digital I/F) for converting the 1394 Format data into bus data of certain specific units of audio data and video data (hereinafter referred to as DV bus data), 3 is a DV bus data, 4 is an error correction encoder for adding an error correction parity, 5 is a record modulator doing modulation, 6 is a record amplifier, 7 is a magnetic tape.
FIG. 12 is a block diagram of a conventional reproducing apparatus, which diagram shows the structure of a digital VCR using the 1394 digital interface. In FIG. 12, numeral 11 denotes a magnetic tape, 12 is a reproduction amplifier, 13 is a reproduction demodulator which performs equalizing, detecting and demodulating processes, 14 is an error correction decoder which performs error correction process based on an error correction parity added at recording, 15 is a DV bus data, 16 is a digital I/F which converts DV bus data into the 1394 Format data, 17 is an output terminal of the 1394 digital interface signal.
A 1394 Format digital signal delivered to terminal 1 is converted by the digital I/F 2, and generates DV bus data 3. The error correction encoder 4 adds an error correction parity to the DV bus data 3, the record modulator 5 performs modulation process for recording, and the data is recorded in the magnetic tape 7 via record amplifier 6.
When reproducing a data recorded in magnetic tape 11, a reproduced data is delivered to reproduction demodulator 13 via reproduction amplifier 12. The reproduction demodulator 13 distinguishes the 0, 1 of the reproduced data, and demodulates the data which has been modulated for recording. The data demodulated by reproduction demodulator 13 is delivered to error correction decoder 14, the error correction decoder 14 corrects the correctable error based on an error correction parity added at recording, and outputs DV bus data 15. The digital I/F 16 converts the DV bus data 15 into the 1394 Format digital signal to be outputted from t
REFERENCES:
patent: 4961204 (1990-10-01), Tanaka et al.
patent: 5303342 (1994-04-01), Edge
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Japanese language search report dated Sep. 2, 1997 for Int'l Application No. PCT/JP97/01965.
English Translation of Japanese language search report for Int'l Appln. No. PCT/JP97/01965.
Otaka Hideki
Tanaka Shinya
Togawa Shinichi
Yoshida Takayasu
Garber Wendy
Matsushita Electric - Industrial Co., Ltd.
Onuaku Christopher
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