Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent
1981-02-20
1985-10-29
George, Keith E.
Electrical audio signal processing systems and devices
Loudspeaker feedback
1791155R, H04R 308, H04R 906
Patent
active
045504300
ABSTRACT:
A sound reproducing system utilizes motional feedback and an improved integrated magnetic structure for reducing loudspeaker distortion; for reducing acoustic coupling between the radiated sound energy output and the cone motion sensing structure thereby reducing unwanted feedback signals; and for reducing obstruction of the radiated sound energy output by the cone motion sensing structure thereby minimizing undesirable alteration of the radiated tonal quality. The loudspeaker includes a cone, a frame, and flexible webs. The main electromagnetic structure includes a rear cylindrical iron pole piece, an annular cylindrical permanent magnet, an inner annular cylindrical iron pole piece, a main voice coil bobbin, a main voice coil, and a front annular cylindrical iron pole piece. The cone motion sensing structure includes a front annular copper disc, a rear cylindrical non-magnetic support member, an annular cylindrical copper sleeve, a cylindrical iron rod, a feedback sensing coil, a feedback sensing coil bobbin, and a feedback sensing coil bobbin support member. The associated circuitry includes a stability control network, a velocity equalizer, and a frequency equalizer. A feature of the present invention is that: the cone motion sensing structure utilizes the stray magnetic field of the main electromagnetic structure to provide the motional feedback signal which is functionally related to axial cone velocity, which motional feedback signal is fed to the stability control network. An advantage of the present invention is that it allows use of smaller loudspeakers and smaller loudspeaker enclosures.
REFERENCES:
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patent: 3798374 (1974-03-01), Meyers
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patent: 4025722 (1977-05-01), Karron
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"North American Philips Publication;" Undated Trade Circular Distributed by North American Philips Corp.
George Keith E.
Oliveras R. Martin
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