Method for broadcasting high definition television programs using temporal attenuation
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United States of America Patent
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-
Jun 19, 1990
Grant Date -
N/A
app pub date -
Nov 10, 1988
filing date -
Nov 12, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For broadcasting an HDTV picture over a transmission channel having a frequency band narrower than that necessary for direct transmission of the HD TV picture, the HDTV source picture is sub-sampled at an analysis image frequency f.sub.o for distributing the spatial data of each HDTV image of the source picture over n successive frames, n being greater than 1. The resulting samples are subjected to temporal energy attenuating filtering in a frequency range around fO/n to obtain a modified signal, which is sent over the transmission channel. Upon reception, the modified signal is subjected to temporal filtering for enhancing energy in the frequency range before subjecting it to decoding for restoring the HDTV picture.
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