Host controller for programmable digital hearing aid system
DC CAFCFirst Claim
1. 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.
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Accused Products
Abstract
A host controller for producing data from a computer for a programmable filter of a hearing aid to cancel feedback in which phase shift and gain control means as adjusted by the computer to generate a feedback cancellation voltage which is supplied to the hearing aid for summation of the feedback and feedback cancellation voltages by the hearing aid and in which the summed feedback and feedback cancellation voltages are returned to the host controller for further adjustment of said phase shift and gain control means until feedback has been cancelled. The host controller then transmits to the programmable filter the phase shift and gain control data necessary to cancel feedback.
109 Citations
6 Claims
- 1. 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.
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6. A host controller for programming a filter interposed in a transmission channel of a hearing aid between a microphone and a receiver from a computer associated with the host controller comprising a signal generator for generating test signals supplied to the receiver, a circuit for returning an output signal from the transmission channel, a phase and amplitude measuring circuit for measuring the phase and amplitude of the output signal, said phase and amplitude circuit including adjustable phase shift and amplitude means controlled by the computer for adjusting the phase shift and amplitude necessary to eliminate acoustic feedback and transmitting an acoutical feedback cancellation signal to the hearing aid and a circuit for receiving signals from the hearing aid indicative of the summation of acoustic feedback and acoustic feedback cancellation signals to produce a null summation when the phase shift and amplitude adjustments necessary to eliminate acoustic feedback have been achieved.
Specification