| 54 |
Title |
TI |
[EN] Mobile radio set comprising a speech processing arrangement |
| 71/73 |
Applicant/owner |
PA |
PHILIPS CORP, US
|
| 72 |
Inventor |
IN |
KELLERMANN WALTER, DE
|
| 22/96 |
Application date |
AD |
Sep 7, 1994 |
| 21 |
Application number |
AN |
30213994 |
|
Country of application |
AC |
US |
|
Publication date |
PUB |
Feb 11, 1997 |
33
31
32 |
Priority data |
PRC
PRN
PRD |
DE
4330243
19930907
|
| 51 |
IPC main class |
ICM |
G10L 3/02
|
| 51 |
IPC secondary class |
ICS |
|
|
IPC additional class |
ICA |
|
|
IPC index class |
ICI |
|
|
Cooperative patent classification |
CPC |
H04R 1/406
H04R 2430/23
H04R 3/005
|
|
MCD main class |
MCM |
G10L 15/20
(2006.01)
|
|
MCD secondary class |
MCS |
G10L 21/0208
(2013.01)
H04B 7/26
(2006.01)
H04R 1/40
(2006.01)
H04R 3/00
(2006.01)
|
|
MCD additional class |
MCA |
|
| 57 |
Abstract |
AB |
[EN] A speech processing arrangement has at least two microphones for supplying microphone signals formed by speech components and noise components to microphone signal branches that are coupled to an adder device used for forming a sum signal. The microphone signals are delayed and weighted by weight factors in the microphone signal branches. The arrangement includes an evaluation circuit that a) receives the microphone signals, b) estimates the noise components, c) estimates the speech components by forming the difference between one of the microphone signals and the estimated noise component for this microphone signal, d) selects one of the microphone signals as a reference signal which contains a reference noise component and a reference speech component, e) forms speech signal ratios by dividing the estimated speech components by the estimated reference speech component, f) forms noise signal ratios by dividing the powers of the estimated noise components by the power of the estimated reference noise component, and g) determines the weight factors by dividing each speech signal ratio by the associated noise signal ratio. The signal-to-noise ratio corresponds to the ratio of the power of the speech component to the power of the noise component of the sum signal. Because the speech signals are correlated and noise signals are uncorrelated, the sum signal available on the output of the adder device has a reduced noise component yielding improved speech audibility. Real-time computation of the weight factors eliminates any annoying delay during a conversation held using the speech processing arrangement. |
| 56 |
Cited documents identified in the search |
CT |
US000004536887A
US000004802227A
US000005012519A
|
| 56 |
Cited documents indicated by the applicant |
CT |
|
| 56 |
Cited non-patent literature identified in the search |
CTNP |
Frequency Domain Noise Suppression Approaches in Mobile Telephone Systems , Jin Yang, Published in Proc. ICASSP, vol. 2, pp. 363 366, Apr. 1993. 0;
R. Zelinski, A Micro Array With Adaptive Post Filtering For Noise Reduction In Reverberant Rooms , 1988 International Confernece on Acoustics, Speech, and Signal Processing, Apr. 11 14, 1988, pp. 2578 2581. 0;
Speech Enhancement Using a Soft Decision Noise Suppression Filter , McAulay et al, IEEE Trans. on ASSP, vol. 28, No. 2, pp. 137 145, Apr. 1980. 0
|
| 56 |
Cited non-patent literature indicated by the applicant |
CTNP |
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Citing documents |
|
Determine documents
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Sequence listings |
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Search file IPC |
ICP |
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