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 Title: |
US5943429:
Spectral subtraction noise suppression method
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Handel, Peter; Uppsala, Sweden
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| Assignee: |
Telefonaktiebolaget LM Ericsson, Stockholm, Sweden
other patents from TELEFONAKTIEBOLAGET LM ERICSSON (566545) (approx. 3,778)
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| Published / Filed: |
1999-08-24
/ 1997-07-28
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| Application Number: |
US1997000875412
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| IPC Code: |
Advanced:
G10L 15/02;
G10L 15/20;
G10L 21/02;
Core:
G10L 15/00;
G10L 21/00;
IPC-7:
H04B 15/00;
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| ECLA Code: |
G10L21/02;
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| U.S. Class: |
Current:
381/094.2;
704/226;
704/E21.002;
Original:
381/094.2;
704/226;
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| Field of Search: |
381/71.1,71.9-71.14,94.1-94.4,94.7-94.9,FOR 123,124,115,116,317,318
704/226-228
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| Priority Number: |
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| Abstract: |
A spectral subtraction noise suppression method in a frame based digital communication system is described. Each frame includes a predetermined number N of audio samples, thereby giving each frame N degrees of freedom. The method is performed by a spectral subtraction function H(w) which is based on an estimate of the power spectral density of background noise of non-speech frames and an estimate Φx (w) of the power spectral density of speech frames. Each speech frame is approximated by a parametric model that reduces the number of degrees of freedom to less than N. The estimate Φx (w) of the power spectral density of each speech frame is estimated from the approximative parametric model.
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| Attorney, Agent or Firm: |
Burns, Doane, Swecker & Mathis, L.L.P. ;
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| Primary / Asst. Examiners: |
Loomis, Paul; Mei, Xu
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| INPADOC Legal Status: |
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| Designated Country: |
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| Family: |
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First Claim:
Show all 10 claims |
What is claimed is:
1. A spectral subtraction noise suppression method in a frame based digital communication system, each frame including a predetermined number N of audio samples, thereby giving each frame N degrees of freedom, wherein a spectral subtraction function H(ω) is based on an estimate Φv (ω) of a power spectral density of background noise of non-speech frames and an estimate Φx (ω) of a power spectral density of speech frames comprising the steps of:
- approximating each speech frame by a parametric model that reduces the number of degrees of freedom to less than N;
- estimating said estimate Φx (ω) of the power spectral density of each speech frame by a parametric power spectrum estimation method based on the approximative parametric model; and
- estimating said estimate Φv (ω) of the power spectral density of each non-speech frame by a non-parametric power spectrum estimation method.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| PCT Number: |
PCT/SE96/00024
WO9624128
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| PCT Pub./Filed Dates: |
1996-08-08 / 1996-01-12
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| § 371 / 102(e) Dates: |
1997-07-28 / 1997-07-28
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| Forward References: |
Show 37 U.S. patent(s) that reference this one
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