0558312-A1 is referenced by 95 patents and cites 3 patents.

A noise reduction circuit for a hearing aid having an adaptive filter for producing a signal which estimates the noise components present in an input signal. The circuit includes a second filter for receiving the noise-estimating signal and modifying it as a function of a user's preference or as a funtion of an expected noise environment. The circuit also includes a gain control for adjusting the magnitude of the modified noise-estimating signal, thereby allowing for the adjustment of the magnitude of the circuit response. The circuit also includes a signal combiner for combining the input signal with the adjusted noise-estimating signal to produce a noise reduced output signal.

Title
Adaptive noise reduction circuit for a sound reproduction system.
Application Number
EP19930301401 19930225
Publication Number
0558312 (A1)
Application Date
February 25, 1993
Publication Date
September 1, 1993
Inventor
Connell Michael P
US
O& 039
Engebretson Maynard A
US
Assignee
Central Inst Deaf
US
IPC
H04R 25/00
H03H 21/00
G10L 03/02
H04R 25/00
H04R 03/04
H04B 03/04
H03H 17/08
H03H 17/00
G10L 21/00
H03H 21/00
H04R 25/00
H04R 03/04
H04B 03/04
H03H 17/08
H03H 17/00
G10L 21/02
H03H 21/00
View Original Source Download PDF