Coded data generation or conversion – Quantizer
Patent
1994-03-21
1997-02-18
Gaffin, Jeffrey A.
Coded data generation or conversion
Quantizer
H03M 100
Patent
active
056045026
ABSTRACT:
A novel method and apparatus is disclosed for controlling inverse discrete cosine transform ("IDCT") mismatch between an encoder and decoder using different IDCT implementations under all coding conditions. Sychronization between the encoder and decoder is forced by selectively setting certain small DCT coefficients, which are prone to mismatch, to zero at the encoder. Advantageously, the invention may be implemented solely in the encoder to minimize system complexity and cost, and allow for IDCT mismatch control utilizing conventional decoders.
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Haskell Barin G.
Yan Li
Gaffin Jeffrey A.
Lucent Technologies - Inc.
Vick Jason H.
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