Audio decoder

Details Audio decoder Audio decoder

1996-09-27

1999-02-02

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

704503, 704501, 704504, H04N 726

Patent

active

058678190

ABSTRACT:
An audio decoder which can reduce a memory circuit capacity necessary for performing a series of decoding processes and can perform a down mixing. The audio decoder decodes audio data of a plurality of channels encoded in a frequency domain by using a time base to frequency base conversion. After a down mixing process was performed to the audio data of the frequency domain by frequency domain down mixing circuit, it is converted into audio data of a time domain by frequency base to time base converting circuit, thereby reducing memories by the number corresponding to the reduced number of channels. Further, by executing an inverse quantizing process of each channel and a frequency base to time base converting process of each channel by pipeline processes, a work buffer can be shared in both of the processes.

REFERENCES:
patent: 4092603 (1978-05-01), Harrington
patent: 4291310 (1981-09-01), Kruger
patent: 4369336 (1983-01-01), Agnello
patent: 4472745 (1984-09-01), Foerster
patent: 5164980 (1992-11-01), Bush
patent: 5394249 (1995-02-01), Shimoda
patent: 5539452 (1996-07-01), Bush
patent: 5561608 (1996-10-01), Shimoda
Furui et al., Advances in Speech Signal Processing, Marcel Dekker, Inc. 1992, pp. 109-141.

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