Enhancing audio signals by nonlinear spectral operations

Details Enhancing audio signals by nonlinear spectral operations Enhancing audio signals by nonlinear spectral operations

2007-10-02

2007-10-02

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

C381S094100, C381S094300, C381S098000, C381S103000, C704S224000, C704S225000, C704S226000

Reexamination Certificate

active

10606373

ABSTRACT:
A system and method are disclosed for enhancing audio signals by nonlinear spectral operations. Successive portions of the audio signal are processed using a subband filter bank. A nonlinear modification is applied to the output of the subband filter bank for each successive portion of the audio signal to generate a modified subband filter bank output for each successive portion. The modified subband filter bank output for each successive portion is processed using an appropriate synthesis subband filter bank to construct a modified time-domain audio signal. High modulation frequency portions of the audio signal may be emphasized or de-emphasized, as desired. The modification may be applied within one or more frequency bands.

REFERENCES:
patent: 5878389 (1999-03-01), Hermansky et al.
patent: 5886276 (1999-03-01), Levine et al.
patent: 6098038 (2000-08-01), Hermansky et al.
patent: 6112169 (2000-08-01), Dolson
patent: 6182042 (2001-01-01), Peevers
patent: 6317117 (2001-11-01), Goff
Steven F. Boll. Suppression of Acoustic Noise in Speech Using Spectral Subtraction. IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-27, No. 2, Apr. 1979.
Carlos Avendano and Jean-Marc Jot:Ambience Extraction and Synthesis from Stero Signals for Multi-Channel Audio Up-Mix;vol. II—1957-1960: © 2002 IEEE.
Jean-Marc Jot and Carlos Avendano:Spatial Enhancement of Audio Recordings;AES 23rdInternational Conference, Copenhagen, Denmark, May 23-25, 2003.
Bosi, Marina, et al, ISO/IEC MPEG-2 advanced audio coding, AES 101, Los Angeles, Nov. 1996, J. Audio Eng. Soc., vol. 45, No. 10, Oct. 1997.
Duxbury, Chris, et al, “Separation of Transient Information in Musical Audio Using Multiresolution Analysis Techniques”, Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-01), Dec. 2001.
Levine, Scott N., et al, “Improvements to the Switchland Parametric and Transform Audio Coder”, Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, Oct. 1999, pp. 43-46.
Pan, Davis, “A Tutorial on MPEG/Audio Compression” IEEE MultiMedia, Summer, 1995.
Quatieri, T.F., et al, “Speech Enhancement Based on Auditory Spectral Change”, Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, Oct. 1999, pp. 43-46.
Steven F. Boll.Suppression of Acoustic Noise in Speech Using Spectral Subtraction.IEEE Transactions on Acoustics, Speech and Signal Processing. Apr. 1979. pp. 113-120. vol. ASSP-27, No. 2.

Affiliated with

Also associated with

Rating

Enhancing audio signals by nonlinear spectral operations does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Enhancing audio signals by nonlinear spectral operations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enhancing audio signals by nonlinear spectral operations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3866890