Patent ID: 9694745
Date: 2017-07-04
CPC Classifications: B60Q,G10K

Claim:
1. A vehicle approach alert device comprising: a first output sound voltage waveform signal generator including: a second output sound voltage waveform signal generator including: a sensor signal input circuit that inputs a sensor signal from a sensor, which generates the sensor signal corresponding to a driving condition of the vehicle; a mixer circuit that combines 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 to produce a mixed approach alert sound voltage waveform; 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 the mixed approach alert sound voltage waveform signal, through the sound output body, wherein the first output sound voltage waveform signal generator calculates an envelope frequency of the vehicle approach alert sound based on the sensor signal input through the sensor signal input circuit, sets a sound volume setting value in the first sound volume variable device according to the envelope frequency, and adds a fluctuation, caused by a sound volume change, into the vehicle approach alert sound with controlling the voltage level of the first approach alert sound voltage waveform signal to turn up and down the sound volume of the vehicle approach alert sound according to the envelope frequency, and the envelope frequency is a frequency of a control signal that varies the first approach alert sound of the first output sound generator in the mixed approach alert sound voltage waveform output from the mixer circuit according to the driving condition of the vehicle.