Audio decoder

Details Audio decoder Audio decoder

2006-07-11

2011-12-20

Ghyka, Alexander (Department: 2812)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Quadrasonic

C381S020000, C381S001000

Reexamination Certificate

active

08081764

ABSTRACT:
Provided is an audio decoder which can reduce an amount of arithmetic operations while suppressing occurrence of aliasing noise. The audio decoder includes: a decoder (102) and an analysis filter bank (110) which generate, from a coded down-mixed signal, the first frequency band signal (x) corresponding to a down-mixed signal (M); a channel expansion unit (130) which converts the first frequency band signal (x) generated by the analysis filter bank (110) into output signals (y) corresponding to respective audio signals of N channels, using BC information; an synthesis filter bank (140) which performs band synthesis for the output signals (y) generate by the channel expansion unit (130) and thereby converts the output signals (y) into the respective audio signals of the N channels on a time axis; and an aliasing noise detection unit (120) which detects occurrence of aliasing noise in the first frequency band signal (x). The channel expansion unit (130) further prevents the aliasing noise from being included in the output signals (y), based on information detected by the aliasing noise detection unit (120).

REFERENCES:
patent: 7289626 (2007-10-01), Carter et al.
patent: 2005/0149339 (2005-07-01), Tanaka et al.
patent: 2007/0255572 (2007-11-01), Miyasaka et al.
patent: 1264533 (2000-08-01), None
patent: 2004-248989 (2004-09-01), None
patent: 99/04498 (1999-01-01), None
patent: 2006/022124 (2006-03-01), None
Shida et al., “Variable Equalizer with Differential Amplifiers” IEEE, Transactions on Circuits and Systems, vol. CAS-24, No. 6, Jun. 1977, pp. 318-320.
International Search Report issued Oct. 17, 2006 in the International (PCT) Application of which the present application is the U.S. National Stage.
Frank Baumgarte et al., “Binaural Cue Coding—Part I: Psychoacoustic Fundamentals and Design Principles”, IEEE Trans. on Speech and Audio Processing, 2003, vol. 11, No. 6, pp. 509-519.
J. Herre et al., “The Reference Model Architecture for MPEG Spatial Audio Coding”, 118th AES Convention, Barcelona, Spain, presented May 28-31, 2005, Convention Paper 6447.
Osamu Shimada et al., “A Low Power SBR Algorithm for the MPEG-4 Audio Standard and its DSP Implementation”, 116th AES Convention, Berlin Germany, presented May 8-11, 2004, Convention Paper.
Supplementary European Search Report (in English language) issued in European patent application No. 06768096.7 on Oct. 6, 2008.

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