Showing papers on "Digital hearing aid published in 1986"
TL;DR: A hearing aid system comprises a hearing aid that is programmable so as to have optimum electro-acoustic characteristics for the patient and acoustic environment in which it is used as mentioned in this paper, where selected optimum parameter values are programmed into an electronically erasable, programmable read-only memory (EEPROM) which supplies coefficients to a programmable filter and amplitude limiter in the hearing aid so that the hearing aids adjust automatically to the optimum set of parameter values for the speech level, room reverberation, and type of background noise then obtaining.
Abstract: A hearing aid system comprises a hearing aid that is programmable so as to have optimum electro-acoustic characteristics for the patient and acoustic environment in which it is used. Selected optimum parameter values are programmed into an electronically erasable, programmable read only memory (EEPROM) which supplies coefficients to a programmable filter and amplitude limiter in the hearing aid so as to cause the hearing aid to adjust automatically to the optimum set of parameter values for the speech level, room reverberation, and type of background noise then obtaining. The programmable filter may be a digital equivalent of a tapped delay line in which each delayed sample is multiplied by a weighting coefficient and the sum of the weighted samples generates a desired electro-acoustic characteristic. Alternatively, the programmable filter may be a tapped analog delay line in which the sum of the weighted outputs of the taps generates the desired characteristics. Acoustical feedback is reduced by an electrical feedback path in the hearing aid which is matched in both amplitude and phase to the acoustic feedback path, the two feedback signals being subtracted so as to cancel each other.
104 citations
07 Apr 1986
TL;DR: A wearable signal processor is described in this paper that is intended for the study of a four-channel, instantaneous compression hearing aid and other possible applications, such as a 16-channel vibrotactile aid and the modeling of cochlear implant devices are considered.
Abstract: Studies of wearable hearing prostheses such as digital hearing aids, multichannel vibrotactile aids, and cochlear implants have been restricted to rather simple circuits. The availability of small, high performance, digital signal processors has made it possible to implement models of hearing prostheses in real time. And, it is now possible to implement these models in wearable form with low-power digital signal processors. A wearable signal processor is described in this paper that is intended for the study of a four-channel, instantaneous compression hearing aid. In addition, other possible applications, such as a 16-channel vibrotactile aid and the modeling of cochlear implant devices are considered.
8 citations