06934677 is referenced by 97 patents and cites 9 patents.

Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization matrices. The invention includes several techniques and tools, which can be used in combination or separately. For example, the audio encoder can generate quantization matrices from critical band patterns for blocks of audio data. The encoder can compute the quantization matrices directly from the critical band patterns, which can be computed from the same audio data that is being compressed. The audio encoder/decoder can use different modes for generating/applying quantization matrices depending on the coding channel mode of multi-channel audio data. The audio encoder/decoder can use different compression/decompression modes for the quantization matrices, including a parametric compression/decompression mode.

Title
Quantization matrices based on critical band pattern information for digital audio wherein quantization bands differ from critical bands
Application Number
10/17702
Publication Number
6934677 (B2)
Application Date
December 14, 2001
Publication Date
August 23, 2005
Inventor
Ming Chieh Lee
Bellevue
WA, US
Naveen Thumpudi
Sammamish
WA, US
Wei Ge Chen
Issaquah
WA, US
Agent
Klarquist Sparkman
Assignee
Microsoft Corporation
WA, US
IPC
G10L 019/02
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