Title :
A Micropower CMOS Circuit for Hearing Aids
Author :
Mauthe, M. ; Kleine, U. ; Linnert, P. ; Steeger, G.H.
Abstract :
A three channel micropower CMOS circuit for a programmable hearing aid is presented. It allows the compensation of even difficult hearing impairments by dividing the frequcency range in three channels and adjusting the dynamic losses separately. Thus, an individual hearing aid can be programmed. The circuit consists of two RC-active antialiasing filters, a multi-rate SC filter bank, several offset compensated SC amplifiers, three compression amplifiers, a post filter, and a digital control and I/O part. The implementation of the filter bank and the compression amplifiers is described in more detail. The circuit operates with a single 1.3 V battery and the current consumption is only 1 mA.
Keywords :
CMOS integrated circuits; digital control; hearing aids; I/O part; RC-active antialiasing filters; compensation; compression amplifiers; digital control; hearing aids; hearing impairments; multirate SC filter bank; offset compensated SC amplifiers; programmable hearing aid; three channel micropower CMOS circuit; Auditory system; Channel bank filters; Circuits; Dynamic range; Filter bank; Frequency; Gain control; Hearing aids; Microphones; Speech;
Conference_Titel :
Solid-State Circuits Conference, 1990. ESSCIRC '90. Sixteenth European
Conference_Location :
Grenoble
Print_ISBN :
2-86332-087-4
