Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Reexamination Certificate
2007-09-18
2007-09-18
Chawan, Vijay (Department: 2626)
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
C704S200100, C704S503000, C704S229000
Reexamination Certificate
active
10336637
ABSTRACT:
A perceptual encoder divides an audio signal into successive time blocks, each time block is divided into frequency bands, and a scale factor is assigned to each of ones of the frequency bands. Bits per block increase with scale factor values and band-to-band variations in scale factor values. A preliminary scale factor for each of ones of the frequency bands is determined, and the scale factors for the each of ones of the frequency bands is optimized, the optimizing including increasing the scale factor to a value greater than the preliminary scale factor value for one or more of the frequency bands such that the increase in bit cost of the increasing is the same or less than the reduction in bit cost resulting from the decrease in band-to-band variations in scale factor values resulting from increasing the scale factor for one or more of the frequency bands.
REFERENCES:
patent: 5581653 (1996-12-01), Todd
patent: 5956674 (1999-09-01), Smyth et al.
patent: 6226616 (2001-05-01), You et al.
patent: 6430533 (2002-08-01), Kolluru et al.
patent: 6757658 (2004-06-01), Kolluru et al.
patent: 6934677 (2005-08-01), Chen et al.
patent: 7027982 (2006-04-01), Chen et al.
Aggarwal et al., (“Trellis-based optimization of MPEG-4 Advanced audio coding”, IEEE workshop on Speech Coding. Proceedings, Meeting the Challenges of the new Millenium, Sep. 17, 2000, pp. 142-144).
Lau et al., (“A Common Transform Engine For MPEG & AC3 Audio Decoder,” ICCI Conference on Consumer Electronics, 1997, Digest of Technical Papers, Jun. 11-13, 1997, pp. 202-203), 559-566.
Tsai et al., (“An MPEG audio decoder chip”, IEEE Transactions on Consumer Electronics, Feb. 1995, vol. 41, Issue 1, pp. 89-96).
Li et al., (“An AC-3 MPEG multi-standard audio decoder IC,” Proceedings of Custom Integrated Circuits Conference, 1997, May 5-8, 1997, pp. 245-248).
Aggarwal. A., et al., “Trellis-Based Optimization of MPEG-4 Advanced Audio Coding,” IEEE Workshop on Speech Coding Proceedings. Meeting the Challenges of the New Millennium, Sep. 17, 2000, pp. 142-144.
Bosi, M., et al., “ISO/IEC MPEG-2 Advanced Audio Coding,” Journal of the Audio Engineering Society, Audio Engineering Society, New York, vol. 45, No. 10, Oct. 1, 1997, pp. 789-812.
“Digital Audio Compression (AC-3) Standard.” Approved Nov. 10, 1994. (Rev 1) Annex A added Apr. 12, 1995. (Rev 2) 13 corrigendum added May 24, 1995. (Rev 3) Annex B and C added Dec. 20, 1995.
“ISO/IEC MPEG-2 Audio Coding” by Bosi et al. presented at the 101stConvention Nov. 8-11, 1996, Los Angeles, Audio Engineering Society Preprint 4382).
Princen et al, “Analysis/synthesis filter bank design based on time domain aliasing cancellation,” IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-34, pp. 1153-1161, Oct. 1986.
“Increased Efficiency MPEG-2 AAC Encoding,” by Smithers et al, Audio Engineering Society Convention Paper, Presented at the 111thConvention Sep. 21-24, 2001. New York.
Chapter 15 (“Tree and Trellis Encoding”) of Vector Quantization and Signal Compression by Allen Gersho and Robert M. Gray, Kluwer Academic Publishers, Boston, 1992, pp. 555-586.
Chawan Vijay
Dolby Laboratories Licensing Corporation
Gallagher Thomas A.
Gallagher & Lathrop
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