Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Reexamination Certificate
2005-07-05
2005-07-05
McFadden, Susan (Department: 2655)
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
C704S200100, C704S504000, C708S300000
Reexamination Certificate
active
06915264
ABSTRACT:
A method and apparatus for determining masked thresholds for a perceptual auditory model used, for example, in a perceptual audio coder, which makes use of a filter bank structure comprising a plurality of filter bank stages which are connected in series, wherein each filter bank stage comprises a plurality of low-pass filters connected in series and a corresponding plurality of high-pass filters applied to the outputs of each of the low-pass filters, and wherein downsampling is advantageously applied between each successive pair of filter bank stages. In accordance with one illustrative embodiment, the filter bank comprises low order IIR filters. The cascade structure advantageously supports sampling rate reduction due to the continuously decreasing cutoff frequency in the cascade. The filter bank coefficients may advantageously be optimized for modeling of masked threshold patterns of narrow-band maskers, and the generated thresholds may be advantageously applied in a perceptual audio coder.
REFERENCES:
patent: 4459542 (1984-07-01), Terrier et al.
patent: 4896356 (1990-01-01), Millar
patent: 5138569 (1992-08-01), Valenzuela
patent: 5394473 (1995-02-01), Davidson
patent: 5623577 (1997-04-01), Fielder
patent: 5841681 (1998-11-01), Chen et al.
patent: RE36714 (2000-05-01), Brandenburg et al.
ISO/IEC JTC1/SC29/WG11 “Coding of moving pictures and audio—MPEG-2 Advanced Audio Coding”,ISO/IEC 13818-7 International Standard, Annex B, Section 2.1, (1997).
ITU-R “Method of objective measurement of perceived audio quality,”Rec. ITU-R BS.1387, Annex 2, Section 2.2, Geneva (1998).
Baumgarte, F. “Evaluation of a Physiological Ear Model Considering Masking Effects Relevant to Audio Coding”,105thAES Convention, San Francisco, CA, Preprint 4789 (1998).
Hall, J.L., “Asymmetry of masking revisited: Generalization of masker and probe bandwidth”,J Acoust. Soc. Am., 101(2), 1023-1033 (1997).
Ruggero, M.A. et al., “Basilar-membrane responses to tones at the base of the chinchilla cochlea”,J. Acoust. Soc. Am., 101(4), 2151-2163, (1997).
Edler, B. et al., “Audio Coding Using a Psycho-acoustic pre- and postfilter”,Proc. ICASSP, Istanbul, (2000).
Baumgarte, F., “A Physiological Ear Model for Auditory Masking Applicable to Perceptual Coding”,Presented at the 103rdAES Convention, Preprint No. 4511, New York, (1997).
Baumgarte, F., “A Physiological Ear Model for Specific Loudness and Masking”,Proc. Workshop on Applications of Sig. Proc. To Audio and Acoustics, New Paltz, (1997).
Kates, J.M., “A Time-Domain Digital Cochlear Model”,IEEE Trans. On Signal Processing, vol. 39, No. 12, pp. 2573-2592 (1991).
Lyon, R.F., “All-Pole Models Of Auditory Filtering”,preprint fromdicklyon@acm.org.published in Diversity in Auditory Mechanics, Lewis et al., (eds.), pp. 205-211 (1997).
Brown Kenneth M.
Lucent Technologies - Inc.
McFadden Susan
Vo Huyen X.
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