EP 0071845 B1 19851127 - APPARATUS FOR COMPENSATING HEARING DEFICIENCIES
Title (en)
APPARATUS FOR COMPENSATING HEARING DEFICIENCIES
Publication
Application
Priority
DE 3131193 A 19810806
Abstract (en)
[origin: US4508940A] An exemplary embodiment includes a plurality of parallel signal channels coupled with a signal input transducer, such as a microphone or induction coil. Each of the signal channels includes a respective bandpass filter for selection of a different frequency band, a controlled-gain amplifier, controlled by a volume control potentiometer, circuits for non-linear signal processing, and a bandpass filter for the reduction of distortion components caused by the non-linear processing circuits. A summing amplifier combines the signal components from all channels and is connected via an amplifier to an output signal transducer. Space requirements and power consumption are reduced in such a multi-channel processing arrangement by implementing all of the filters as sampled-data analog circuits. As a result hearing aids are provided which can be worn on the head, e.g. behind the ear.
IPC 1-7
IPC 8 full level
H03H 19/00 (2006.01); H04R 25/00 (2006.01); H04R 25/04 (2006.01)
CPC (source: EP US)
H04R 25/505 (2013.01 - EP US); H04R 25/356 (2013.01 - EP US); H04R 2225/43 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH GB LI NL
DOCDB simple family (publication)
EP 0071845 A2 19830216; EP 0071845 A3 19830420; EP 0071845 B1 19851127; AT E16748 T1 19851215; CA 1198509 A 19851224; DE 3131193 A1 19830224; DE 3131193 C2 19890413; DK 152869 B 19880524; DK 350582 A 19830207; JP S5834700 A 19830301; US 4508940 A 19850402
DOCDB simple family (application)
EP 82106683 A 19820723; AT 82106683 T 19820723; CA 408764 A 19820805; DE 3131193 A 19810806; DK 350582 A 19820805; JP 13561682 A 19820803; US 40041382 A 19820721