Environment protection D/A pulse width modulating loudspeaker for vehicle

The utility model provides an environment protection D/A pulse width modulating acoustic horn for vehicles, which relates to an electronic vehicle acoustic horn in vehicle parts. The utility model is provided with an oscillator (1) and an oscillator (7). An output end is connected with an input end of a PWM modulator (2). An output end of the PWM modulator (2) is connected with an input end of a PWM pusher (3), and an output end of the PWM pusher (3) is connected with an input end of a D stage amplifier (4). An output end of the D stage amplifier (4) is connected with a loudspeaker (5). Because the utility model has two oscillators, the single acoustic horn can send out dual tones. Thus, the utility model can replace two electronic acoustic horns for vehicles in the existing technical structure. The cost is low. In addition, since the utility model adopts the D/A pulse width modulation technology, the electricity to sound conversion rate is high, the relative acoustic pressure level is low and the noise interference and environment pollution are less. In addition, the utility model also has the advantages of stable performance, no adjustment requirement and compact structure. The utility model is not only suitable for vehicles, such as automobiles, motorbikes, motor vehicles, etc., but also is suitable for sailing ships.