Analog dereverberation system

Details Analog dereverberation system Analog dereverberation system

1977-04-27

1978-01-17

Claffy, Kathleen H.

179 1SA, G10L 100, H04R 300

Patent

active

040693953

ABSTRACT:
Room reverberation characteristic of monaural systems is removed, in accordance with the principles of this invention, by employing two microphones at the sound source and by manipulating the signals of the two microphones to develop a single nonreverberant signal. Both early echoes and late echoes in the signal received by each microphone are removed by manipulating the signals of the two microphones in separate frequency bands of the signal. Corresponding frequency bands of the two signals are co-phased and added and the magnitude of each resulting frequency band is modified in accordance with a computed phase difference average between the corresponding frequency bands. The modified frequency bands are combined, thereby forming the nonreverberant signal.

REFERENCES:
patent: 3440350 (1969-04-01), Flanagan
patent: 3644674 (1972-02-01), Mitchell
patent: 3794766 (1974-02-01), Cox

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