Headphone assemblies

Details Headphone assemblies Headphone assemblies

1990-08-10

1994-11-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Hearing protectors, electrical

381195, 381 71, A61F 1102, G10K 1116

Patent

active

053613040

ABSTRACT:
A headphone assembly for an active noise cancellation system has a rigid moulded plastics shell having a rigid baffle dividing the shell interior into a front volume and a closed rear volume, both of which may be filled with an acoustic foam. The baffle has a central opening in which is mounted a headphone transducer, and a seal cushion is disposed around the mouth of the shell, to effect an air-tight seal against the user's head. The headphone transducer has two effective sound radiating surfaces of different sizes, and may be constructed as a form of orthodynamic drive unit. In the latter case, the orthodynamic drive unit diaphragm may have two separate coils of different radial extents.

REFERENCES:
patent: 3873784 (1975-03-01), Doschek
patent: 4833719 (1989-05-01), Carme et al.
patent: 4953217 (1990-08-01), Twiney et al.
patent: 5003609 (1991-03-01), Muraoka
Advertisement for Yamaha YH-1/2/3 Orthodynamic Headphone, Apr. 1983.

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