Automotive electronic communication apparatus with theft disabli

Details Automotive electronic communication apparatus with theft disabli Automotive electronic communication apparatus with theft disabli

1988-03-29

1989-02-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307 10AT, 340 63, 340691, 34082531, 34082532, G08B 1314

Patent

active

048089818

ABSTRACT:
To prevent overriding an electronic car radio theft disabling system by connecting an external battery to a car radio prior to theft thereof, the radio includes a measuring circuit (7, 7') measures the impedance of a connected accessory, for example a loudspeaker or loudspeaker system (8), and if the impedance of connected loudspeaker does not match the impedance stored in a memory (5) of the car radio, operation of the radio is inhibited until the appropriate code word--known only to the proper owner--is reinserted.

REFERENCES:
patent: 4494114 (1985-01-01), Kaish
patent: 4683462 (1987-07-01), Takeda et al.
patent: 4720700 (1988-01-01), Siebold et al.
patent: 4734896 (1988-03-01), Soma et al.
patent: 4743894 (1988-05-01), Bochmann

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