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US 5,479,517 AGranted
Method of estimating delay in noise-affected voice channels
AssigneeDaimler-Benz Aktiengesellschaft
InventorKlaus Linhard
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Abstract
The present invention relates to a method of reducing noise in a speech detection system. The phases of at least two noise-affected signals are estimated. The phase estimate and the phase compensation required for the noise reduction are performed in the frequency domain. The background noise and the transient behavior of the enclosed space are simultaneously estimated.
Claims17
A method for estimating a delay between a first signal of a first noise-affected voice channel and a second signal of a second noise-affected voice channel, the first and second signals being related, the method comprising the steps of:
- transforming the first and second signals to frequency domain signals;
- cross correlating the transformed first and second signals to produce a cross power density of the first and second signals;
- generating a phase value representing a phase between the first and second signals based on a first predetermined number of maxima values of the cross power density of the first and second signals;
- and
- performing a phase compensation in the frequency domain based on the phase value for compensating for the delay between the first and second signals.
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