Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1994-09-26
1996-06-11
Tran, Thai O.
Facsimile and static presentation processing
Facsimile
Recording apparatus
360 101, H04N 576, H04N 578
Patent
active
055261353
ABSTRACT:
A recording and/or reproducing apparatus for grouping input video data at an interval of a predetermined number of pixels and encoding each block by a DCT circuit, a quantization circuit and an entropy encoding circuit, recording the encoded data on a magnetic tape, and reproducing the magnetic tape for producing block-by-block data, which is decoded to produce output video data, includes a filtering circuit for reducing horizontal and vertical frequency components generated by repetitive occurrences of the respective data blocks. For a differential speed playback mode, such as shuttle playback, the video data reproduced and decoded during the differential speed playback mode is passed through the filtering circuit for producing a satisfactory playback image in which block components are suppressed even for the differential speed playback mode.
REFERENCES:
patent: 4746971 (1988-05-01), Kimura et al.
patent: 4847701 (1989-07-01), Suesada
patent: 4930024 (1990-05-01), Kanda et al.
patent: 5136391 (1992-08-01), Minami
patent: 5196930 (1993-03-01), Kadono et al.
patent: 5237424 (1993-08-01), Nishino et al.
patent: 5253122 (1993-10-01), Chiba et al.
Chevalier Robert
Frommer William S.
Sinderbrand Alvin
Sony Corporation
Tran Thai O.
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