Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion – With content reduction encoding
Patent
1995-10-26
1999-03-30
Dorvil, Richemond
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
With content reduction encoding
G10L 300
Patent
active
058901248
ABSTRACT:
An MPEG audio/video decoder has memories, a signal processing unit (SPU) including a multiplier and a butterfly unit, a main CPU, and a memory controller which are time division multiplexed between decoding video and audio data. For audio decoding, the butterfly unit determines combinations of components of a frequency-domain vector to reduce the number of multiplies required to transform to the time domain (matrixing). Matrixing is interwoven with MPEG filtering to increase throughput of the decoder by increasing parallel use of the multiplier, the butterfly unit, and a memory controller. A widowing process for the MPEG standard uses only independent components of the audio vectors. This reduces the required number of components to be stored, thereby reducing the size of required memory, the time to write the components after matrixing, and the time to retrieve the components for windowing.
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C-Cube Microsystems Inc.
Dorvil Richemond
Millers David T.
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