Disclosed are a sound generation system, an ultrasonic wave emitting device, and an ultrasonic wave emitting method which utilize the principle of parametric speakers (which uses the difference between frequencies of two ultrasonic waves) and which are capable of allowing target persons in a prescribed area to hear a sound only when a mobile body approaches said prescribed area. An alert system (10) has an ultrasonic wave emitting device (100) mounted on a mobile body (200), and an ultrasonic wave emitting device (300) permanently installed near an area (A101). The ultrasonic wave emitting device (300) emits a first ultrasonic wave towards an area at least including the aforementioned area (A101), and meanwhile, the ultrasonic wave emitting device (100) emits a second ultrasonic wave. The ultrasonic emitting device (100) forms the second ultrasonic wave by means of modulating the ultrasonic wave of frequency f1 with an audible signal.
SOUND GENERATION SYSTEM, ULTRASONIC WAVE EMITTING DEVICE, AND ULTRASONIC WAVE EMITTING METHOD
KLANGERZEUGUNGSSYSTEM, VORRICHTUNG ZUR EMISSION VON ULTRASCHALLWELLEN UND VERFAHREN ZUR EMISSION VON ULTRASCHALLWELLEN
SYSTÈME DE GÉNÉRATION DE SON, DISPOSITIF D'ÉMISSION D'ONDE ULTRASONORE ET PROCÉDÉ D'ÉMISSION D'ONDE ULTRASONORE
2015-08-26
Patent
Electronic Resource
English
IPC: | G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / G08B SIGNALLING OR CALLING SYSTEMS , Signalisier- oder Rufsysteme / H04R LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS , Lautsprecher, Mikrofone, Schallplatten-Tonabnehmer oder ähnliche akustische, elektromechanische Wandler |
ULTRASONIC WAVE OUTPUT DEVICE AND SOUND GENERATION CONTROL METHOD
European Patent Office | 2019
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