Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within cabin or compartment of vehicle
Reexamination Certificate
2000-08-23
2003-03-04
Isen, Forester W. (Department: 2644)
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Within cabin or compartment of vehicle
C381S094700, C381S071600
Reexamination Certificate
active
06529606
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to communication systems, for example, methods and systems for introducing an incoming signal along with canceling signals into an environment to cancel undesired signals (e.g., noise).
BACKGROUND OF THE INVENTION
In both mobile and land-line telephone systems, speaker-phone systems have been utilized to allow a user to communicate with another party without using a handset. Conventional speaker-phone systems usually include a microphone to transmit communications from the user and a speaker to transmit the incoming signals received from the other party communicating with the user.
In certain environments, the presence of background noise may distract and/or make it quite difficult for the user to hear the other party. For example, when using a speaker-phone system in a vehicle, the user is exposed to a variety of undesirable background noises introduced by the engine, exhaust system and tires as well as other noises. The presence of these background noises can interfere and reduce the ability of the user to hear the other party.
Accordingly, there is a need to eliminate or reduce undesirable signals within a particular environment. There is also a need to cancel undesired signals having a variety of frequency ranges and signals having a regular periodic or recurring component.
A preferred embodiment of the invention, is now described, by way of example only, with reference to the drawings.
REFERENCES:
patent: H417 (1988-01-01), Miles
patent: 5182774 (1993-01-01), Bourk
patent: 6130949 (2000-10-01), Aoki et al.
patent: 6151397 (2000-11-01), Jackson, Jr. II et al.
patent: 6256394 (2001-07-01), Deville et al.
Freeburg Thomas A.
Jackson, Jr. II I. Riley
Bose Romi N.
Isen Forester W.
Pendleton Brian
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