Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-11-07
1987-07-28
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
34082532, 455158, G08B 1314, G06F 704, H04B 1116
Patent
active
046834621
ABSTRACT:
A device for protecting audio equipment adapted to be installed in an automobile against theft includes a code storage section for previously storing a specific code in a memory, a code entry section for entering a code when the audio equipment is to be operated, a comparator circuit for comparing the code entered from the code entry section with the code read from the memory, and a muting circuit that usually mutes the electrical signal which would otherwise be applied to the power amplifier of the audio equipment. Unless the specific code is entered from the code entry section, the audio equipment is made inoperative by the electronic lock.
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Igarashi Tsutomu
Takeda Kazuma
Alpine Electronics Inc.
Mullen Jr. Thomas J.
Shoup Guy W.
Swann III Glen R.
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