Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1995-06-06
1996-04-23
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358310, H04N 576, H04N 592
Patent
active
055109039
ABSTRACT:
In a digital video tape recorder which employs discrete cosine transformation and variable length coding for compressing the data to be recorded, the necessity of an additional signal line for transmission of information incidental to the principal data is eliminated, and a processing margin is obtained in track units upon variable speed reproduction and the like. The digital video tape recorder samples an NTSC signal at a ratio of 4:1:1 or 4:2:0, transforms the sample data for each block of 8.times.8 data by DCT, encodes the transformed data into variable length codes so that 30 DCT blocks constitute a buffering unit having a fixed length to compress the data, and segmentally records the video signal obtained by the data compression divisionally in 10 tracks for each frame. In the digital video tape recorder, the frequency of a signal processing clock signal used for data compression is selected to be equal to 192/143 times the frequency of 13.5 MHz used for sampling the original analog component video signal when converting the same to digital form. A first blanking area for transmission of the incidental information is provided for each DCT block, and a second blanking area is provided for each track for obtaining the desired processing margin in track units upon variable speed reproduction and the like.
REFERENCES:
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patent: 5257141 (1993-10-01), Matsumi et al.
patent: 5287196 (1994-02-01), Yamashita et al.
IEEE Transactions on Consumer Electronics vol. 37, No. 3, Aug. 1991, New York US pp. 275-282 XP000263196 Yoneda et al. `An Experimental Digital VCR with New DCT-Based Bit-Rate Reduction System` p. 277, right column, paragraph 3, FIGS. 1-2, 4.
International Conference on Acoustics, Speech and Signal Processing Apr. 1988, New York, N.Y., US pp. 1312-1315 XP000040488 Aartsen et al. `Error resilience of a video codec for low bitrates` p. 1313, left column, paragraph 3-paragraph 4, FIGS. 2-3.
Symposium Record Broadcast Sessions Jun. 1989, Montreux, CH pp. 410-420 XP000041133 Barbieri et al. `A Modular Flexible Video Codec Architecture for Application to TV and HDTV` p. 412, paragraph 3-p. 415, paragraph 2, FIG. 1.
Chin Tommy P.
Frommer William S.
Nguyen Huy
Sony Corporation
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