Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent
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.
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Ng Jin F.
Schroeder L. C.
Velodyne Acoustics Inc.
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