1975-11-04
1977-05-31
Cooper, William C.
H04R 128
Patent
active
040271161
ABSTRACT:
A headphone supported at the ear position for reproducing sound comprising (a) a frame, (b) a cone membrane, (c) at least one opening provided in the frame to connect the space, defined between the front face of the frame and the rear face of the cone membrane, and the free space at the rear part of the frame, (d) a member for applying acoustic resistance to sound which passes through the openings, and (e) a mask member to vary bass reproduction characteristics by varying the area of the opening providing the acoustic resistance.
REFERENCES:
patent: 1915358 (1933-06-01), Giles
patent: 2022060 (1935-11-01), Swickard
patent: 2645301 (1953-07-01), DeVries
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