05111419 is referenced by 109 patents and cites 11 patents.

An electronic filter for filtering an electrical signal. Signal processing circuitry therein includes a logarithmic filter having a series of filter stages with inputs and outputs in cascade and respective circuits as

Title
Electronic filters, signal conversion apparatus, hearing aids and methods
Application Number
172266
Publication Number
5111419
Application Date
April 11, 1988
Publication Date
May 5, 1992
Inventor
Thomas J Sullivan
Kirkwood
MO, US
George L Engel
Crestwood
MO, US
A Maynard Engebretson
Ladue
MO, US
Robert E Morley Jr
Richmond Heights
MO, US
Agent
Senniger Powers Leavitt & Roedel
Assignee
Central Institute for the Deaf
MO, US
IPC
H04R 25/00
G06F 15/31
View Original Source