Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1994-09-07
1997-02-11
Tung, Kee M.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
381 92, 381 94, G10L 302
Patent
active
056029624
ABSTRACT:
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.
REFERENCES:
patent: 4536887 (1985-08-01), Kaneda et al.
patent: 4802227 (1989-01-01), Elko et al.
patent: 5012519 (1991-04-01), Adlersberg et al.
"Frequency Domain Noise Suppression Approaches in Mobile Telephone Systems", Jin Yang, Published in Proc. ICASSP, vol. 2, pp. 363-366, Apr. 1993.
"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.
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.
Rosenthal Eugene J.
Tung Kee M.
U.S. Philips Corporation
LandOfFree
Mobile radio set comprising a speech processing arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mobile radio set comprising a speech processing arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mobile radio set comprising a speech processing arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-349352