Robert F Demers

US Patent:

41141385, Sep 12, 1978

Filed:

Aug 23, 1976

Appl. No.:

5/716581

Inventors:

Robert Augustus Demers - Marlboro MA

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H04Q 900

US Classification:

340147R

Abstract:

A selective calling circuit includes a central control code generator for generating a digital stream having repetitions of selected code words of digital information for selectively calling a plurality of remote receiving stations in this circuit. Each remote station includes a decoder for recognizing a predetermined sequence of digital information and reconstructing selected digital code words included therein. A variable modulus counter, responsive to clock pulses and means for selectively varying the modulus of the counter, is included in the code generator at the central control station. A resettable counter that counts in response to clock pulses and is reset in response to received code signals is included in the decoder at the remote station.