Vehicle approach alert device

Abstract

A vehicle approach alert device is provided with: a first sound generation voltage waveform signal generation unit including a first sound generation output generation unit (27a) that generates a first signal corresponding to sound generation data read from a memory device, and a first volume varying unit (26a) that controls a voltage level of the first signal; a second sound generation voltage waveform signal generation unit including a second sound generation output generation unit (27b) that generates a second signal corresponding to the sound generation data read from the memory device, and a second volume varying unit (26b) that controls a voltage level of the second signal; a mixer circuit (24) that mixes the first and the second signals; and an amplifier (25) that causes a current corresponding to a voltage of the mixed signals to flow through a sound generation member (3) so as to generate vehicle approach alert sound.

Description

[0001] Cross-reference of related applications [0002] This indication is based on the Japanese application number 2011-275998 for which it applied on December 16, 2011, and uses the description content here. technical field [0003] The present disclosure relates to a vehicle approach notification device that notifies surroundings that a vehicle is approaching by generating sound from the vehicle. Background technique [0004] In recent years, in electric vehicles (EV vehicles), hybrid vehicles (HV vehicles), etc., since the structure generates little noise and it is difficult for pedestrians to notice the approach of these vehicles, it is equipped with a A vehicle approach notification device that generates an approach notification sound based on the recognition that the vehicle is nearby (for example, refer to Patent Document 1). In this vehicle approach reporting device, as a sounding method, sounding data such as PCM (Pulse Code Modulation) stored in a memory of a mic...

AI Technical Summary

Problems solved by technology

[0006] However, since the utterance data is expressed in a form with "fluctuation" added, the amount of time necessary to store the utterance data, that is, the length of time of the utterance data increases, resulting in an increase in storage capacity.

In addition, due to the time limit of the storage capacity of the microcomputer, there is a problem that it is not possible to sufficiently add the "fluctuation" of the sound such as the "emphasis and inflection of the head" that is intended to be uttered.

[0007] In addition, even if "fluctuation" is added to the sound data, there is a problem that the way pedestrians hear the approaching sound will change depending on the installation location and sound insulation characteristics of the vehicle approaching sounding device in the vehicle.

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