Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2006-09-19
2006-09-19
Philippe, Gims (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240160
Reexamination Certificate
active
07110451
ABSTRACT:
In a bitstream transcoder, the computational cost and the memory area are suppressed so that stream transcoding is performed with a reduced number of times of computing and a reduced memory area. The transcoder includes a VLD portion11for performing VLD on a bitstream encoded in MPEG-2 to output quantized DCT coefficients; an IQ portion12for receiving the coefficients, and outputting inverse-quantized DCT coefficients; a coefficient table132for storing a transformation matrix obtained by multiplying transformation matrices for operating band-limiting filter, IDCT, down-sampling and DCT, respectively, together in advance; a DCT scaling portion13for performing down-sampling on the DCT coefficients by use of the transformation matrix; a Q portion15for outputting quantized DCT coefficients down-sampled horizontally and vertically; and a VLC portion16for encoding the quantized DCT coefficients in MPEG-4 to output a bitstream.
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Imaide Takuya
Nakamura Taku
Ohtsubo Hiroyasu
Yamamoto Naoki
Hitachi , Ltd.
Philippe Gims
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