Method and apparatus for cancelling room reverberation and noise

Details Method and apparatus for cancelling room reverberation and noise Method and apparatus for cancelling room reverberation and noise

1977-04-27

1978-01-03

Claffy, Kathleen H.

179 1SA, G10L 100, H04R 300

Patent

active

040668428

ABSTRACT:
Room reverberation and other uncorrelated signal sources characteristic of monaural systems are 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 the frequency domain. Corresponding frequency samples of the two signals are co-phased and added and the magnitude of each resulting frequency sample is modified in accordance with the computed cross-correlation between the corresponding frequency samples. The modified frequency samples are combined and transformed to form the nonreverberant or correlated signal portion.

REFERENCES:
patent: 3440350 (1969-04-01), Flanagan
patent: 3644674 (1972-02-01), Mitchell et al.
patent: 3662108 (1972-05-01), Flanagan
patent: 3794766 (1974-02-01), Cox

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