| 主权项 |
1. A vehicle approach alert device comprising:
a first output sound voltage waveform signal generator having:
a first output sound generator that reads out an output sound data from a memory device, for storing the output sound data of an approach alert sound of a vehicle, with a pitch corresponding to a carrier frequency, and generates a first approach alert sound voltage waveform signal corresponding to the output sound data; anda first sound volume variable device that adjusts a sound volume by controlling a voltage level of the first approach alert sound voltage waveform signal generated by the first output sound generator; a second output sound voltage waveform signal generator having:
a second output sound generator that reads out the output sound data from the memory device with the pitch corresponding to the carrier frequency, and generates a second approach alert sound voltage waveform signal corresponding to the output sound data; anda second sound volume variable device that adjusts the sound volume by controlling a voltage level of the second approach alert sound voltage waveform signal generated by the second output sound generator; a mixer circuit that mixes the first approach alert sound voltage waveform signal, of which the voltage level is controlled, and the second approach alert sound voltage waveform signal, of which the voltage level is controlled; and an amplifier that outputs a vehicle approach alert sound from a sound output body mounted on the vehicle with flowing current, which corresponds to a voltage of a mixed approach alert sound voltage waveform signal, through the sound output body. |
