Device and process for use in encoding audio data

Details Device and process for use in encoding audio data Device and process for use in encoding audio data

2004-03-08

2009-12-15

Hudspeth, David R (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S200100, C704S500000

Reexamination Certificate

active

07634400

ABSTRACT:
A mask generation process for use in encoding audio data, including generating linear masking components from the audio data, generating logarithmic masking components from the linear masking components, and generating a global masking threshold from the logarithmic masking components. The process is a psychoacoustic masking process for use in an MPEG-1-L2 encoder, and includes generating energy values from a Fourier transform of the audio data, determining sound pressure level values from the energy values, selecting tonal and non-tonal masking components on the basis of the energy values, generating power values from the energy values, generating masking thresholds on the basis of the masking components and the power values, and generating signal to mask ratios for a quantizier on the basis of the sound pressure level values and the masking thresholds.

REFERENCES:
patent: 6385572 (2002-05-01), Hu
patent: 6950794 (2005-09-01), Subramaniam et al.
patent: 7003449 (2006-02-01), Absar et al.
Chan et al., “A low-complexity, high-quality, 64-Kbps audio codec with efficient bit allocation”, Digital Signal Processing, vol. 13, Issue 1, Jan. 2003, pp. 23-41.
Davidson, Grant A. et al., “Parametric Bit Allocation in a Perceptual Audio Coder,” 97th Convention of Audio Engineering Society. 1-20, Nov. 1994.
Pan, Davis, “A Tutorial on MPEG/Audio Compression,” IEEE Journal on Multimedia. Summer, 1995.
Zwicker, E, “Subdivision of the Audible Frequency Range into Critical Bands,” Journal of the Acoustical Society of America. 33(2):248, Feb. 1961.

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