초록 ▼

A communication system, such as a hearing aid or a public address system, may include a microphone for inputting audio information to the system, an amplifier for amplifying audio frequency signals inputted to the microphone, and a speaker for outputting amplified audio frequency signals into the en

A communication system, such as a hearing aid or a public address system, may include a microphone for inputting audio information to the system, an amplifier for amplifying audio frequency signals inputted to the microphone, and a speaker for outputting amplified audio frequency signals into the environment which provides an acoustic feedback path between the speaker and the microphone. The invention provides an identification circuit for dynamically identifying those parameters associated only with acoustic feedback, and a correction circuit whose transfer function is established in accordance with the parameters identified by the identification circuit. The transfer function of the correction circuit is such that the effect of acoustic feedback is cancelled from the transfer function of communication system. The identification circuit is constructed and arranged to identify said parameters in response to a turn-on of the system, or to an automatically-sensed threshold change in gain of the amplifier.

대표청구항 ▼

A method to control acoustic feedback in a communications system operating in an acoustic environment and having a microphone component for inputting audio information into the system, an amplifier component for amplifying audio frequency signals inputted to the microphone, and a speaker component f

A method to control acoustic feedback in a communications system operating in an acoustic environment and having a microphone component for inputting audio information into the system, an amplifier component for amplifying audio frequency signals inputted to the microphone, and a speaker component for outputting audio frequency signals into said environment, said method comprising: (a) identifying those parameters associated with acoustic feedback, including identifying time-variations in these parameters; (b) adjusting the transfer function of said amplifier component in accordance with the identified parameter for cancelling the effects of said acoustic feedback in response to identification of the parameters associated therewith without attenuating any audio frequencies.