A SURVEY OF AUDIO PROCESSING ALGORITHMS FOR DIGITAL STETHOSCOPES

An automobile burglar alarm and theft prevention device for use in an automotive vehicle is adapted to prevent operation of the vehicle when the device is placed in an operative mode. The device comprises an alarm circuit which includes the battery of the vehicle, the alarm and vibration detectors which are adapted to close said alarm circuit upon sensing vibrations caused by automobile tampering. The device also includes an automobile operating circuit comprising the battery, the electrically powered automotive starting elements, a switch for selectively connecting either the alarm circuit or the automobile operating circuit to the battery, and a relay for (1) switching the switch to connect the alarm circuit to the battery while disconnecting the automobile operating circuit and the battery, and (2) switching the switch to connect the automobile operating circuit to the battery while disconnecting the alarm circuit and the battery, thereby disabling the electrically powered automotive starting elements at all times that the alarm circuit is connected to the battery and preventing activation of the car. In alternate embodiments, the automotive accessories are (1) operative, and (2) inoperative, regardless of whether the alarm circuit or the automobile operating circuit is connected to the battery.