Motor vehicle alarm system with acoustic signal emission via at least one radio loudspeaker installed into the motor vehicle

An alarm system having improved acoustic signal transmitting capability is provided for motor vehicles. The radio speaker system of the vehicle is employed for both passenger listening and for warning signal transmission in the event of unauthorized intrusion or attempted theft. The speakers occupy...

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Bibliographische Detailangaben
Hauptverfasser:	ROBITSCHKO, PETER, KURTH, HERMANN
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR ALARM SYSTEMS ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS ORDER TELEGRAPHS PERFORMING OPERATIONS PHYSICS PUBLIC ADDRESS SYSTEMS SIGNALLING SIGNALLING OR CALLING SYSTEMS SOUND-PRODUCING DEVICES TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	An alarm system having improved acoustic signal transmitting capability is provided for motor vehicles. The radio speaker system of the vehicle is employed for both passenger listening and for warning signal transmission in the event of unauthorized intrusion or attempted theft. The speakers occupy their usual installation positions in a vehicle, such as horizontally mounted in the dashboard, when used for the purpose of listening to a radio or tape. When the vehicle is unoccupied, and theft or tampering are attempted, an alarm system is activated which causes a control element to swivel the speaker into a position parallel to an external surface of the vehicle. Due to this repositioning of the speaker, reflection of an alarm signal back into the interior of the vehicle is minimized, and transmission of the alarm signal to the outside of the vehicle is optimized.