Electrical audio signal processing systems and devices – Hearing protectors – electrical
Patent
1990-07-10
1992-05-26
Isen, Forester W.
Electrical audio signal processing systems and devices
Hearing protectors, electrical
381163, 381 71, A61F 1102
Patent
active
051174618
ABSTRACT:
A device for performing electroacoustic functions including noise cancellation, hearing aid, communication interface, headset, feed for recording device, and headphone functions. The device includes composite transducers connected to a control unit. The composite transducers can be mounted on a headband and are configured to include input transducers for converting acoustic waves into electrical signals for processing by a control unit, and output transducers for converting the processed electrical signals to processed sound waves. The control unit includes an inverter/amplifier and a mixer/output amplifier for inverting the electrical input and controlling the gain for either adjusting the gain to maximize a noise cancellation function or increasing the gain beyond the minimum level heard by the ear to a desired level for a hearing aid function. Connectors for connecting recorders and a boom microphone, and function selection switches are provided by the control means for connecting circuit components of the control unit selectively for performing the above functions. The input and output transducers have oppositely oriented diaphragms mounted in a common plane to provide an inverted acoustic wave in real time for combining with and substantially cancelling an incoming acoustic wave. In this embodiment, an isolation wall means may also be incorporated to prevent sound from the output transducer from propagating back into the input transducer. In a second embodiment, the input and output transducer are both oriented in the same direction toward the user's ear canal.
REFERENCES:
patent: 2972018 (1961-02-01), Hawley et al.
patent: 3952158 (1976-04-01), Kyle et al.
patent: 4928311 (1990-05-01), Trompler
patent: 4972491 (1990-11-01), Wilcox, Jr.
patent: 5001763 (1991-03-01), Moseley
Isen Forester W.
MNC Inc.
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