Encoding system and decoding system for audio signals including

Details Encoding system and decoding system for audio signals including Encoding system and decoding system for audio signals including

1997-01-09

1999-02-23

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704220, 704219, G10L 500

Patent

active

058754245

ABSTRACT:
An encoding system is disclosed, which includes an input terminal for receiving an input signal, a signal converting portion for converting the input signal into frequency-domain signals and grouping several frequency-domain signals into blocks, an analyzing portion for analyzing the input signal and the frequency-domain signals and obtaining an allowable error, a selecting portion for selecting one of a plurality of quantizing portions that quantizes frequency-domain signals of each block corresponding to the allowable error, a plurality of quantizing portions for quantizing frequency-domain signals corresponding to selection information and calculating amplitude information and codes, at least one pulse quantizing portion for encoding only part of the frequency domain signals, a multiplexing portion for multiplexing the amplitude information, codes, and selection information, and an output terminal for outputting the multiplexed signal.

REFERENCES:
patent: 5369724 (1994-11-01), Lim
patent: 5490130 (1996-02-01), Akagiri
Pan, "an Overview of the MPEG/Audio Compression Algorithm", Proceedings of the SPIE, vol. 2187:260-273 (1994).
"Information Technology--Coding of Moving Pictures and Associated Audio for Digital Storage Media At Up to About 1,5 Mbits/s", ISO/IEC (International Organization for Standardization/International Electro-Technical Commission) 11172-3: 1993, pp. i-vi and 1-151.

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