Electroacoustic devices with noise-reducing capability

Details Electroacoustic devices with noise-reducing capability Electroacoustic devices with noise-reducing capability

2004-12-08

2008-12-16

Ensey, Brian (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

C381S071400, C381S074000

Reexamination Certificate

active

07466838

ABSTRACT:
New and improved electroacoustic devices each including at least one transducer assembly having one or more microphones typically mounted on a baffle plate and disposed in substantially the same acoustic plane as a speaker or speakers. In the various embodiments, at least one microphone and at least one speaker face the same or opposite directions. Each microphone may be parallel to or oriented at an angle with respect to the speaker. In other embodiments, the speaker includes a central opening or cavity in which a microphone having one of various orientations is provided. The orientations of the microphone or microphones with respect to the speaker or speakers minimize adverse noise reduction effects associated with the differences in sensitivities, frequency responses and phase responses and acoustic time delays between the microphones and the speaker or speakers, as well as minimize sound reflections that are picked up by the microphone or microphones.

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patent: 5117461 (1992-05-01), Moseley
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patent: 6567525 (2003-05-01), Sapiejewski
patent: 6683965 (2004-01-01), Sapiejewski
patent: 6735316 (2004-05-01), Wurtz

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