Television – Bandwidth reduction system – Data rate reduction
Patent
1994-11-08
1997-04-01
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348419, 348406, 348384, H04N 1102
Patent
active
056171420
ABSTRACT:
A method and apparatus are provided for changing the compression level of digital information, such as digital video information. After having been compressed by a first compression scheme that provides quantized transform coefficients, the digital information is partially decompressed to recover the transform coefficients as they were prior to quantizing. The transform coefficients are then requantized at a different compression level. Complexity and expense are reduced by only partially decompressing and requantizing the previously compressed information to modify its compression level without the need to provide components such as a motion compensation processor and frame store that would be required for full decompression of the information prior to recompression.
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"Reduction of the bit-rate of compressed video while in its coded form" by Morrison, Nilsson, & Ghanbari, Sixth International Workshop of Packet Video, Portland, Oregon, USA. pp. 1-5. Sep. 27, 1994.
Chin Tommy P.
General Instrument Corporation of Delaware
Hoppin Ralph F.
Lipsitz Barry R.
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