Lossless compression/decompression of digital audio data

Details Lossless compression/decompression of digital audio data Lossless compression/decompression of digital audio data

1995-04-17

1999-03-16

Pham, Chi H.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

With content reduction encoding

704504, 371 378, 341 64, G10L 700, G10L 302

Patent

active

058842691

ABSTRACT:
An audio signal compression and decompression method and apparatus that provide lossless, realtime performance. The compression/decompression method and apparatus are based on an entropy encoding technique using multiple Huffman code tables. Uncompressed audio data samples are first processed by a prediction filter which generates prediction error samples. An optimum coding table is then selected from a number of different preselected tables which have been tailored to different probability density functions of the prediction error. For each frame of prediction error samples, an entropy encoder selects the one Huffman code table which will yield the shortest encoded representation of the frame of prediction error samples. The frame of prediction error samples is then encoded using the selected Huffman code table. A block structure for the compressed data and a decoder for reconstructing the original audio signal from the compressed data are also disclosed.

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C. Cellier et al., "Lossless Audio Data Compression for Real Time Applications," 95th AES Convention, Oct. 1993.

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