04499570 is referenced by 13 patents and cites 4 patents.

For the conversion of a signal read from a record carrier into a rectangular signal, a threshold-value circuit is used, whose threshold value is determined by a reference signal. The reference signal is derived from a d.c. component in the converted signal. During a dropout in the signal being read, the reference signal is maintained at the level which it had before the occurrence of the dropout.

Title
Dropout circuit arrangement for converting an information signal into a rectangular signal
Application Number
6/338716
Publication Number
4499570
Application Date
January 11, 1982
Publication Date
February 12, 1985
Inventor
Ronaldus M Aarts
Eindhoven
NL
Kornelis A Schouhamer Immink
Eindhoven
NL
Agent
Algy Tamoshunas
Robert T Mayer
Assignee
U S Philips Corporation
NY, US
IPC
H04N 5/94
G11B 27/36
View Original Source