PMID: 9535523Apr 16, 1998Paper

A programmable sound processor for advanced hearing aid research

IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
H McDermott

Abstract

A portable sound processor has been developed to facilitate research on advanced hearing aids. Because it is based on a digital signal processing integrated circuit (Motorola DSP56001), it can readily be programmed to execute novel algorithms. Furthermore, the parameters of these algorithms can be adjusted quickly and easily to suit the specific hearing characteristics of users. In the processor, microphone signals are digitized to a precision of 12 bits at a sampling rate of approximately 12 kHz for input to the DSP device. Subsequently, processed samples are delivered to the earphone by a novel, fully-digital class-D driver. This driver provides the advantages of a conventional class-D amplifier (high maximum output, low power consumption, low distortion) without some of the disadvantages (such as the need for precise analog circuitry). In addition, a cochlear implant driver is provided so that the processor is suitable for hearing-impaired people who use an implant and an acoustic hearing aid together. To reduce the computational demands on the DSP device, and therefore the power consumption, a running spectral analysis of incoming signals is provided by a custom-designed switched-capacitor integrated circuit incorporating 2...Continue Reading

References

Feb 1, 1988·The Journal of the Acoustical Society of America·L A WilberM C Killion
Feb 1, 1995·Journal of Speech and Hearing Research·R A van BuurenR Plomp
Feb 1, 1994·Ear and Hearing·J L PunchA H Shovels
Feb 1, 1962·The Journal of Speech and Hearing Disorders·G E PETERSON, I LEHISTE

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Citations

Apr 25, 2000·IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·C L LinT S Kuo
Jan 28, 2006·Audiology & Neuro-otology·Mark BachmanG-P Li

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