1978-10-18
1980-12-02
Konick, Bernard
179 1DM, 179 1FS, H04M 120, H04R 302
Patent
active
042373395
ABSTRACT:
An electro-acoustic terminal unit for use in an audio teleconferencing system comprises a loudspeaker and one or more microphones each having a sensitivity which is directionally dependent and exhibits at least one null or substantially null position. The loudspeaker and microphones are rigidly mounted on a boom and the microphones are so located and orientated relative to the loudspeaker that the null position is directed towards the loudspeaker.
REFERENCES:
patent: 2263233 (1941-11-01), Burck
patent: 3992586 (1976-11-01), Jaffe
patent: 4078155 (1978-03-01), Botros et al.
R. Botros, "Audio Teleconferencing-The Telephone and the Environment", Telesis, Feb. 1977, pp. 16-21.
G. Sessler & J. West, "Directional Transducers", I.E.E.E. Transactions on Audio and Electroacoustics, vol. AU-19, No. 1, Mar. 1971, pp. 19-23.
E. Jones, "Providing Foldback With Out-Of-Phase Loudspeakers", Journal of the Audio Engineering Society, vol. 19, No. 4, Apr. 1971, pp. 306-309.
H. Tremaine, Audio Cyclopedia, 1977, pp. 174 & 216, Library of Congress Catalog Card No. 77-82885.
Bunting John G.
Cross Robin C.
Groves Ian S.
Guard David R.
Johnson Edward G. T.
Konick Bernard
Myers Randall P.
The Post Office
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