Method and an apparatus for processing an audio signal

Details Method and an apparatus for processing an audio signal Method and an apparatus for processing an audio signal

2009-05-22

2011-11-15

Vo, Nguyen (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

C455S293000, C381S017000

Reexamination Certificate

active

08060042

ABSTRACT:
A signal processing apparatus and method thereof are disclosed. The present invention includes receiving a low frequency downmix signal including a multi channel signal, phase shift information and spatial information corresponding to parameter band of the low frequency downmix signal, generating the multi channel signal by applying the spatial information based on the parameter band to a whole frequency downmix signal, generating estimated phase shift information of a parameter band by using the phase shift information, and generating a phase shift multi channel signal by shifting a phase of the multi channel signal based on the phase shift information and the estimated phase shift information. Accordingly, it is able to efficiently reproduce a phase or delay difference, which is difficult to be efficiently reproduced by a decorrelator, in a manner of shifting a phase of a decoded audio or speech signal based on phase shift information. And, a phase shift is enabled to fit each parameter band of a multi channel signal with raised coding efficiency.

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Samsudin; Kurniawati E; NG Boon Poh; Sattar F; George F; “A Stereo to Mono Dowmixing Scheme for MPEG-4 Parametric Stereo Encoder” Acoustics, Speech and Signal Processing, 2006, ICASSP 2006 Proceedings. 2006 IEEE International Conference on Toulouse, France May 14-19, 2006, Piscataway, NJ, USA, Jan. 1, 2006, pp. V-V, XP031101562.

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