Method and apparatus for decoding of digital audio data coded in

Details Method and apparatus for decoding of digital audio data coded in Method and apparatus for decoding of digital audio data coded in

1996-03-22

1998-11-03

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

With content reduction encoding

704203, 704500, G10L 302, H04B 166

Patent

active

058324453

ABSTRACT:
A method and apparatus for the decoding of digital audio data encoded in accordance with layer 1 or 2 of the MPEG format. The inverse quantization of the quantizised data samples and the resealing of the inverse quantizised data samples takes place contemporaneously with windowing of the data samples transformed into the time domain and not contemporaneously with transformation of data samples from the frequency domain into the time domain using a matrix operation. The apparatus has fixed-wire frame unpacking and filter bank units. The frame unpacking unit is used for frame synchronization of a data stream, header decoding, reading of page information, inverse quantization of quantizised subband data samples and resealing of the inverse quantizised data samples. The filter bank unit is used for transformation of rescaled data samples from the frequency domain into the time domain using a matrix operation and for windowing of the data transformed into the time domain.

REFERENCES:
Witte, et al., Multipurpose Audio Signal Compander, IEEE Transactions on Consumer Electronics 39:3, 260-268, Aug. 1993.
Witte, et al., Single Chip Implementation of an IOS/MPEG Layer III Decoder, Audio Engineering Society, Feb. 26, 1994.
Multi standard Audio Decoder DAC, Crystal Cemiconductor Corp., Prior to 1995.
Maturi, Dekompression, Elrad, 1994 Hett 1, 64-66 (with English-language translation).
Maturi, G., Single Chip MPEG Audio Decoder,IEEE Trans. Consumer Electr., vol. 38, No. 3, pp. 348, Aug. 1992.

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