Antitheft device for an audio device

Details Antitheft device for an audio device Antitheft device for an audio device

1986-10-27

1989-02-21

Swann, III, Glen R.

Communications: electrical

Continuously variable indicating

With meter reading

340571, G06F 704

Patent

active

048069264

ABSTRACT:
Diodes are used for memorizing an identification number. A microcomputer judges a combination of diodes and decides an identification number corresponding to that combination. The microcomputer is connected directly to a battery. Whether the audio device provided with an antitheft device according to this invention is stolen or not is judged, depending on whether it is connected without interruption to the battery or not. It is judged that the device is stolen, only when the battery has been once disconnected, and in this case the microcomputer doesn't allow the audio device to work, unless the identification number is newly inputted.

REFERENCES:
patent: 4103289 (1978-07-01), Kolber
patent: 4437153 (1984-03-01), Kamiyama et al.
patent: 4494114 (1985-01-01), Kaish
patent: 4604708 (1986-08-01), Lewis
patent: 4683462 (1987-07-01), Takeda et al.
patent: 4720700 (1988-01-01), Seibold et al.

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