Audio signal signal-to-mask ratio processor for subband coding

Details Audio signal signal-to-mask ratio processor for subband coding Audio signal signal-to-mask ratio processor for subband coding

1996-05-31

1998-11-03

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704205, G10L 702

Patent

active

058324275

ABSTRACT:
In an audio signal processing circuit for carrying out a subband coding used for an audio signal coding, a subband filter (12A) receives 1152 audio samples (SI) of each one frame and divides the samples into 32 frequency bands to sequentially output a vector of first half subband signals (SFA) for a first half of the one frame and a vector of second half subband signals (SFB) for a second half of the one frame. A FFT circuit (111A) carries out an FFT processing for 512 audio samples of each of the first half and the second half of each one frame, to sequentially generate a first half power spectrum (PSA) and a second half power spectrum (PSB). A calculating circuit (113A) calculates a first half SMR vector (SMA) on the basis of the first half subband signals (SFA) and the first half power spectrum (PSA), and then, a second half SMR vector (SMB) on the basis of the second half subband signals (SFB) and the second half power spectrum (PSB). A comparing circuit (115) outputs a larger one of the first half SMR vector (SMA) and the second half SMR vector (SMB), as an SMR vector (SM) for the whole of a corresponding one frame.

REFERENCES:
patent: 5394473 (1995-02-01), Davidson
patent: 5508949 (1996-04-01), Konstantinides
patent: 5588024 (1996-12-01), Takano
patent: 5625743 (1997-04-01), Fiocca
Peter Noll, "MPEG Digital Audio Coding", IEEE Signal Processing Magazine, pp. 59-81, Sep. 1987.
Information technology--Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s; ISO/IEC 11172-3: 1993, pp. 109-115.

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