Burglar alarm built in car stereo
First Claim
Patent Images
1. A car alarm system comprising:
- (a) a radio/tape player device within the car including speakers for generating audio sounds, an electronic control circuit and a plurality of function selector switches;
(b) alarm circuit means for sensing alarm conditions within said car and generating alarm signals in response thereto, said alarm circuit means being programmable by said function selector switches;
(c) mode selection circuit means for operatively interfacing said electronic control circuit and said function selector switches in a normal mode, and operatively interfacing said alarm circuit means and said function selector switches in an alarm mode, said mode selection circuit means being responsive to coded signals generated by the actuation of predetermined ones of said function selector switches to change between the normal and alarm modes; and
(d) disarming means for said alarm circuit means including,1. input circuit means for inputting multi-bit disarming codes generated by sequential actuation of a plurality of said function selector switches,2. memory means for storing multi-bit codes input by said plurality of said function selector switches during a programming mode of said disarming means; and
3. equality detector means for determining when a multi-bit code input by the sequential action of said plurality of function selector switches equals the multi-bit code stored in said memory means, and when equal, generating a disarm signal to said alarm circuit means to change said system to said normal mode.
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Abstract
An alarm system for an automobile comprising an alarm circuit chip built into the car stereo housing and interfaced with the stereo circuitry. The alarm system is controlled and programmed by the same selector buttons and controls which operate the car stereo when in an alarm mode. Some of the sensors for the alarm system are disposed in conventional circuit portions of the car, such as the door, hood and trunk light circuits.
30 Citations
19 Claims
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1. A car alarm system comprising:
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(a) a radio/tape player device within the car including speakers for generating audio sounds, an electronic control circuit and a plurality of function selector switches; (b) alarm circuit means for sensing alarm conditions within said car and generating alarm signals in response thereto, said alarm circuit means being programmable by said function selector switches; (c) mode selection circuit means for operatively interfacing said electronic control circuit and said function selector switches in a normal mode, and operatively interfacing said alarm circuit means and said function selector switches in an alarm mode, said mode selection circuit means being responsive to coded signals generated by the actuation of predetermined ones of said function selector switches to change between the normal and alarm modes; and (d) disarming means for said alarm circuit means including, 1. input circuit means for inputting multi-bit disarming codes generated by sequential actuation of a plurality of said function selector switches, 2. memory means for storing multi-bit codes input by said plurality of said function selector switches during a programming mode of said disarming means; and 3. equality detector means for determining when a multi-bit code input by the sequential action of said plurality of function selector switches equals the multi-bit code stored in said memory means, and when equal, generating a disarm signal to said alarm circuit means to change said system to said normal mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification