Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent
1980-04-21
1984-04-17
Martin, John C.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Hearing aid
381 27, H04M 100
Patent
active
044438893
ABSTRACT:
An improved method and apparatus for reproducing sound includes a third channel which is derived from the pair of signals representing traditional left and right stereophonic channels and which represents a linear algebraic difference between such a pair of signals. A third loudspeaker associated with the third channel povides acoustic radiation as a supplement to acoustic radiation from two laterally-spaced loudspeakers normally used to reproduce respective left and right signal channels. Acoustic radiation from the third loudspeaker is toward a preferred listening region and in a direction substantially opposite to that from the two laterally-spaced left and right loudspeakers which are positioned and oriented to provide essentially codirectional acoustic radiation toward the preferred listening region. Preferred embodiments incorporate amplifier and matrixing circuitry to derive the third channel signal and to adjust the level of sound radiated by the third loudspeaker relative to that of sound radiated by left and right loudspeakers.
REFERENCES:
patent: 2845491 (1958-07-01), Bertram
patent: 3171891 (1965-03-01), Amos et al.
patent: 3184550 (1968-05-01), Rogers
patent: 3249696 (1966-05-01), Van Sickle
patent: 3397286 (1968-08-01), Prewitt et al.
patent: 3637938 (1972-01-01), Kuhlow et al.
patent: 3697692 (1972-10-01), Hafler
patent: 4164625 (1979-08-01), Igeta
Adding the Third Channel: High Fidelity Magazine; Apr. 1959, pp. 109, 125, 126.
Coles Edward L.
Martin John C.
Nortech Laboratories Ltd.
Smith A. C.
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