Thin speaker having an enclosure within an open portion and a cl

Details Thin speaker having an enclosure within an open portion and a cl Thin speaker having an enclosure within an open portion and a cl

1987-09-15

1990-02-06

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

181145, 181163, 181164, 181173, 381159, 381182, 381184, 381186, 381194, 381203, H04R 706, H04R 124

Patent

active

048993905

ABSTRACT:
A speaker which is thin but which is capable of providing high-fidelity reproduction and ensuring a suitable level of sound pressure even when it is brought close to a wall. A closed chamber is formed behind one part of a diaphragm mounted in an enclosure, and an open chamber is formed behind another part of the diaphragm. At least one voice coil drive unit is connected to the diaphragm. The phase difference between sounds radiated from the front and rear surfaces of the diaphragm is increased as large as possible by using an acoustic duct for the sound radiated through the open chamber, thereby minimizing cancellation of sounds and improving the sound pressure level.

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Cohen, Hi-Fi Loudspeakers and Enclosures, John F. Rider, New York, 1956, pp. 165-174.
Tremaine, Audia Cyclopedia, Howard W. Sams, Indianapolis, IN, 1979, pp. 1101-1102.

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