Electrical audio signal processing systems and devices – Hearing aids – electrical – Wideband gain control
Patent
1995-09-11
1999-01-19
Chang, Vivian
Electrical audio signal processing systems and devices
Hearing aids, electrical
Wideband gain control
381108, H04R 2500
Patent
active
058622381
ABSTRACT:
A hearing aid uses multiple compression feedback loops to minimize sound distortion includes a preamplifier network having an input connected to an input receiver, an output, and an automatically adjustable gain. The preamplifier network measures an output signal which is preferably a voltage and automatically adjusts the gain in response to the output signal. The hearing aid also includes an output drive network having an input connected to the preamplifier network output and an output connected to a load, such as a transducer. The output drive network has an automatically adjustable gain which is responsive to a measured signal at the output of the network. A volume control circuit may also be connected between the output of the preamplifier network and the input of the output drive network to permit the person wearing the hearing aid to adjust the output volume.
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"Understanding Digitally Programmable Hearing Aids" edited by R.E. Sandlin, Chapter 2, pp. 15, 28, and 31 (1994).
"The Sequel Series--a Smart Systems Product" by J. Agnew, Ph.D, Tom Victorian, Jerry Ruzicka and Michael Block, Ph.D., Starkey Technical Report (undated).
Agnew Jeremy A.
Wahl Jerry R.
Chang Vivian
Maioli Jay H.
Starkey Laboratories, Inc.
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