Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2007-11-27
2007-11-27
Dharia, Prabodh (Department: 2629)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240020, C375S240160, C375S240120
Reexamination Certificate
active
10757961
ABSTRACT:
Digital signals are converted between a first and second format by a conversion process including generating coefficients representing the digital signals. The coefficients may be discrete cosine transform coefficient generated during encoding/transcoding of MPEG signals. The coefficients are subject to quantization by generating a dither signal that is added to the coefficients before quantization to generate a quantized signal. Preferably, each coefficient is first subject to a first quantization in the absence of any dither signal added to generate an undithered quantized coefficient. If the undithered quantized signal is equal to zero the undithered quantized coefficient is taken as the output quantized signal. If the undithered quantized coefficient is different from zero, the dither signal is added and the dithered coefficient thus obtained is subject to quantization to generate the output quantized signal.
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Filippini Gianluca
Pau Danilo Pietro
Piccinelli Emiliano Mario
Dharia Prabodh
Hogan & Hartson LLP
STMicroelectronics S.r.l.
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