05574824 is referenced by 174 patents and cites 6 patents.

A microphone array speech enhancement algorithm based on analysis/synthesis filtering that allows for variable signal distortion. The algorithm is used to suppress additive noise and interference. The processing structure consists of delaying the received signals so that the desired signal components add coherently, filtering each of the delayed signals through an analysis filter bank, summing the corresponding channel outputs from the sensors, applying a gain function to the channel outputs, and combining the weighted channel outputs using a synthesis filter. The structure uses two different gain functions, both of which are based on cross correlations of the channel signals from the two sensors. The first gain yields the GEQ-I array, which performs best for the case of a desired speech signal corrupted by uncorrelated white background noise. The second gain yields the GEQ-II array, which performs best for the case where there are more signals than microphones. The GEQ-II gain allows for a trade-off on a channel-dependent basis of additional signal degradation in exchange for additional noise and interference suppression.

Title
Analysis/synthesis-based microphone array speech enhancer with variable signal distortion
Application Number
225878
Publication Number
5574824
Application Date
April 14, 1995
Publication Date
November 12, 1996
Inventor
Timothy R Anderson
Dayton
OH, US
Randolph L Moses
Worthington
OH, US
Raymond E Slyh
Dayton
OH, US
Agent
Thomas L Kundert
Bernard E Franz
Assignee
The United States of America represented by the Secretary of the Air Force
DC, US
IPC
G10L 3/02
G10L 5/06
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