HDTV system with receivers operable at different levels of resol

Details HDTV system with receivers operable at different levels of resol HDTV system with receivers operable at different levels of resol

1990-08-27

1991-09-17

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, H04N 701, H04N 1120

Patent

active

050499920

ABSTRACT:
A 787.5 line progressively scanned wideband video signal is sub-band coded for providing a plurality of (9.times.9) blocks of spectral coefficients, each representing a respective spatial portion of the video signal. Each block of coefficients is transmitted in truncated form and received by either a first receiver or a second receiver. The first receiver processes the received coefficients for deriving a (9.times.9) block of video pixels corresponding to each block of coefficients and produces a high resolution 787.5 line progressively scanned video image in response thereto. The second receiver processes the received coefficients for deriving a (6.times.6) block of video pixels corresponding to each block of coefficients and produces a lower resolution 525 line progressively scanned video image in response thereto.

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