Electrical audio signal processing systems and devices – Noise or distortion suppression – Using signal channel and noise channel
Patent
1997-12-22
2000-02-08
Chang, Vivian
Electrical audio signal processing systems and devices
Noise or distortion suppression
Using signal channel and noise channel
H04B 1500
Patent
active
060235144
ABSTRACT:
A system and method for factoring a merged wave field, such as a merged acoustic wave field, into independent source signals uses an array of sensors to sense the merged wave field and a signal processor to determine the factored source signal data. One application for the system and method is in a hearing aid to allow an individual to selectively listen to one individual in a group of individuals speaking simultaneously. The system and method factors the merged wave field by predicting the source signals and combining the predicted source signals with source delay values associated with each of the sound or energy sources to form predicted sensor signals. The source delay values can be set as predetermined values or can be calculated using a cross-correlation process. The predicted sensor signals are compared to the actual sensor signals output by each sensor to determine a prediction verification factor. The predicted source signals are adjusted using a random process that minimizes the prediction verification factor. The adjustment and verification of the predicted source signals is performed iteratively until the prediction verification factor reaches a predetermined minimum value. The predicted source signals are then output as factored source signals and can be selected for further processing, such as by transmitting the signal to the user.
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