Method and circuit for noise estimation, related filter,...

Details Method and circuit for noise estimation, related filter,... Method and circuit for noise estimation, related filter,...

2003-11-12

2009-11-03

Hudspeth, David R (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S225000, C704S233000

Reexamination Certificate

active

07613608

ABSTRACT:
A filter such as a Wiener filter for noise reduction in a signal, such as a speech signal, affected by background noise includes a circuit for determining values of an update function relating new value of estimated noise power to a previous value of estimated noise power, the update function being a function of said previous estimated noise power and a mean input power spectral density. The circuit includes a look-up table having values for the update function stored therein with the previous value of estimated noise power and the mean input power spectral density as a first and a second search entry, respectively. These search entries are entered via an input module and exploited by search circuitry associated with the look-up table for selectively searching values for the update function in the look-up table. The search is preferably carried out on the basis of an index computed starting from said first and second search entries.

REFERENCES:
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 5012519 (1991-04-01), Adlersberg et al.
patent: 5632003 (1997-05-01), Davidson et al.
patent: 5781883 (1998-07-01), Wynn
patent: 6415253 (2002-07-01), Johnson
patent: 6445801 (2002-09-01), Pastor et al.
patent: 6823176 (2004-11-01), Rogers
patent: 7478043 (2009-01-01), Preuss
patent: 2003/0018471 (2003-01-01), Cheng et al.
patent: 2003/0033139 (2003-02-01), Walker
patent: 2006/0116874 (2006-06-01), Samuelsson et al.
patent: 0 809 842 (1997-12-01), None
patent: 1 132 896 (2001-09-01), None
patent: 1 278 185 (2003-01-01), None
patent: WO 96/24127 (1996-08-01), None
McAulay et al., “Speech Enhancement Using a Soft-Decision Noise Suppression Filter”, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 28, Issue 2, Apr. 1980, pp. 137-145.
Vilnrotter et al., “Table look-up estimation of signal and noise parameters from quantized observables”,In its The Telecommunications and Data Acquisition Report p. 104-113 (See N87-15329 07-32), Nov. 1986.
“Speech Processing, Transmission and Quality Aspects (STQ); Distributed Speech Recognition; Advanced Front-End Feature Extraction Algorithm; Compression Algorithms”, ETSI Standard, ETSI ES 202 050, vol. 1.1.1, pp. 1-45, (2002).
Citron et al., “Accelerating Multi-Media Processing by Implementing Memoing in Multiplication and Division Units”, Proc. Int. Conf. on Architectual Support For Programming Languages and Operating Systems, XP-002287479, pp. 252-261, (1998).
Chaoui et al., “Implementation of a Car Handsfree Speech Enhancement Application on a TI TMS320C54x DSP”, Acoustics, Speech and Signal Processing, IEEE, XP 010279499, pp. 3057-3060, (1998).

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