A host controller for producing data from a computer for a programmable hearing aid to cancel acoustic feedback comprising means for receiving signals from the hearing aid and measuring phase and amplitude, means for receiving signals from the hearing aid indicative of the summation of acoustic feedback and acoustic feedback cancellation signals, and means controlled by the computer for adjusting the phase and amplitude necessary to eliminate acoustic feedback and produce a null summation. view more

A host controller as set forth in claim 1 including means controlled by the computer for transmitting phase shift and amplitude data to program the hearing aid to eliminate acoustic feedback.

A method of reducing acoustic feedback in a sound system comprising a microphone, a transducer and a signal transmission channel interposed between said microphone and transducer, comprising the steps of determining the effect on the amplitude and phase of a signal in said transmission channel as a function of frequency of acoustic feedback between said transducer and microphone, and inserting between the input and output of said transmission channel an electrical feedback path having a filter therein programmed to equalize and reduce the effect of said acoustic feedback both in amplitude and phase on a signal in said transmission channel. view more

A method of reducing acoustic feedback in a hearing aid comprising a microphone, a receiver fitted in an ear of a wearer of the aid, and a signal transmission channel interposed between said microphone and transducer, comprising the steps of determining the effect on the amplitude and phase of a signal in said transmission channel as a function of frequency of acoustic feedback between said receiver and microphone, and inserting between the input and output of said transmission channel a programmable filter programmed to equalize and reduce the effect of said acoustic feedback both in amplitude and phase on a signal in said transmission channel. view more

A method of reducing feedback in a hearing aid as described in claim 14 in which said programmable filter is inserted in an electrical feedback loop for said transmission channel.

A hearing aid comprising at least one input microphone, an output receiver, a signal transmission channel interposed between said microphone and said receiver, and a programmable delay line filter interposed in a feedback path between the input and output of said transmission channel, said programmable filter being programmed to effect substantial reduction of acoustic feedback from said receiver to said microphone. view more