Method of preventing unauthorized reproduction of a transmission

Details Method of preventing unauthorized reproduction of a transmission Method of preventing unauthorized reproduction of a transmission

1994-06-15

2000-04-04

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

380 3, H04Q 100

Patent

active

060466804

ABSTRACT:
An integrated circuit (IC) configurable as transmitter/receiver includes a method of preventing unauthorized learning and reproduction of an access code as a security measure. When the IC is configured as a receiver and placed in the learn mode, a flag is set in a memory of a microcontroller. If later configured as a transmitter, the microcontroller checks the flag upon power up and if the flag is set, the stored code is randomized so transmission of it is impossible.

REFERENCES:
patent: 4426637 (1984-01-01), Apple
patent: 4596985 (1986-06-01), Bongard
patent: 4928098 (1990-05-01), Danhaeuser
patent: 5103221 (1992-04-01), Memmola
patent: 5159329 (1992-10-01), Lindmayer
patent: 5365225 (1994-11-01), Bachhuber
patent: 5379342 (1995-01-01), Arnold
Data Manual for Texas Instruments TMC3637 Remote-Control Transmitter/Receiver, Pub #SCTS037A, 0493-4-AL from: Linear Products, 1993; Copyright .COPYRGT. 1993, Texas Instruments Incorporated, D4085, Apr. 1993, Printed in the U.S.A.; Total: 48 pages (i-vi, 1.1-1,4, 2.1-2.4, 3.1-3.2, 4.1-4.16, 5.1-5.16).
Texas Instruments TMC3637 Remote Control Transmitter/Receiver Data Manual Pub #SCTS037A ERRATA; Revision data Dec. 21, 1993, 6:30pm.; Texas Instruments Incorporated, Dallas, Texas; Technical Applications Support: Greg Davis (214) 997-3022 and Linear Marketing Support: Rudy Profaizer (214) 997-3410; Total: 7 pages.

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