Loudspeaker with motional feedback

Details Loudspeaker with motional feedback Loudspeaker with motional feedback

1986-02-14

1988-02-23

Ng, Jin F.

Electrical audio signal processing systems and devices

Loudspeaker feedback

381202, 381204, H04M 100

Patent

active

047275847

ABSTRACT:
Improvements in a moving-coil loudspeaker system of the type incorporating motional feedback. An accelerometer mounted on the loudspeaker coil to develop the feedback signal is enclosed within an air-tight shield can to avoid low-frequency instability. High-frequency stability is enhanced by various means including use of a "trumpet" shaped speaker cone, an inverted (concave) dust cap, and theta-dependent cone variations such as providing clusters of holes through the speaker cone to alter the propagation of sound waves radially in selected sectors of the cone. Also disclosed is the use of weights placed on the loudspeaker coil in selected locations circumferentially with respect to the accelerometer to minimize instability effects.

REFERENCES:
patent: 1990409 (1935-02-01), Lawrance
patent: 2106815 (1938-02-01), Scheldorf
patent: 2531634 (1950-11-01), Lawrance
patent: 3111189 (1963-11-01), Scholl
patent: 3174578 (1965-03-01), Kojima
patent: 3937887 (1976-02-01), Miller
patent: 4076098 (1978-02-01), Ward
patent: 4275278 (1981-06-01), Sakurai
patent: 4381831 (1983-05-01), Putnam
patent: 4395588 (1983-07-01), Franssen
patent: 4573189 (1986-02-01), Hall

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