Title:
SIGNAL SCANNING SYSTEM
Document Type and Number:
Japanese Patent JPS5246706
Kind Code:
A
Abstract:
PURPOSE: The existence of loop current on signal path is detected htrough current switch action by connecting scanning matrix and signal path directly without using scanning detection element. As a result, low-power and high-speed operation becomes possible.
Inventors:
UENO TAKAO
ISHIZAWA AKIRA
ISHIZAWA AKIRA
Application Number:
JP12264175A
Publication Date:
April 13, 1977
Filing Date:
October 11, 1975
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04Q3/72; H04Q3/00; (IPC1-7): H04Q3/72