HDTV Sub-band coding using IIR filter bank
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United States of America Patent
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-
Apr 17, 1990
Grant Date -
N/A
app pub date -
Mar 14, 1989
filing date -
Mar 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A technique for the sub-band decomposition and reconstruction of video signals is disclosed. In an illustrative embodiment of the present invention, each field of a video signal is decomposed into sub-bands utilizing a polyphase filter bank unit including an infinite impulse response allpass filter with coefficients that are powers of two. To reconstruct the original image, an FIR is utilized which approximates an IIR allpass filter This eliminates the need for a full field memory in the reconstruction process.
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