04305071 is referenced by 78 patents and cites 3 patents.

In certain situations it is necessary to detect a slight change in a continuous wave signal and to be able to specifically determine the exact position of the change. This is especially necessary in situations where a continuously changing signal (with respect to time) is generated and where it is necessary to determine, at a particular instant of time, any change in the signal from a previous corresponding instant of time. Where the signal is periodic in nature and substantially repeatable between cycles it is possible to establish a memory data base of signal levels as a function of time. Comparisons can then be made on successive cycle against the known, or precalculated data base. Changes between the data base and the new signal result give a positive signal change indication.

Title
Touch sensitive screen signal detection arrangement
Application Number
6/140714
Publication Number
4305071
Application Date
April 16, 1980
Publication Date
December 8, 1981
Inventor
Michael J Sabin
Aberdeen
NJ, US
Robert L Breeden
Middletown Township, Monmouth County
NJ, US
Steve W Bell
Eatontown
NJ, US
Agent
David H Tannenbaum
Assignee
Bell Telephone Laboratories Incorporated
NJ, US
IPC
G08C 21/00
G06F 3/153
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