Method and apparatus for providing compressed non-interlaced sca

Details Method and apparatus for providing compressed non-interlaced sca Method and apparatus for providing compressed non-interlaced sca

1994-03-17

1995-04-25

Kostak, Victor R.

Television

Bandwidth reduction system

Format type

348467, 348441, 348409, H04N 712

Patent

active

054103541

ABSTRACT:
A compression/decompression system includes a source of (1:1 60 Hz) non-interlaced scanned video signal. A preprocessor constructs (2:1 60 Hz) interlaced scanned video signal from the non-interlaced scanned video signal by selection of alternate lines of successive non-interlaced image signals. The interlaced scanned video signal is compressed according to an MPEG protocol of I, P and B frame compression algorithms. I, P and B frame compression is performed such that there are an odd number, greater than one, of B-frames between successive I/P frames (for example the sequence of compressed frames may conform to I, B1, B2, B3, P, B1, B2, B3, P, B1, B2, B3, I, B1, . . . etc). The I compressed frames, the P compressed frames and alternate B compressed frames (the frames B2 in the exemplary sequence) selectively form a primary compressed (2:1 30 Hz) interlaced video signal for reproduction by interlaced scanned receivers. The intervening B-frames selectively form a secondary compressed video. The primary and secondary compressed video signals are received by non-interlaced scanned receivers for reproducing non-interlaced scanned images, while the primary signal alone may be reproduced by interlaced scanned receivers.

REFERENCES:
patent: 5122875 (1992-06-01), Raychaudhuri et al.
patent: 5146325 (1992-09-01), Ng

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