騒音に配慮した音声案内装置の開発
■電子情報部 前川満良
視覚障がい者のために音声で案内する装置が普及するなかで，音声案内装置が騒音源となる課題が顕在化し始めている。本研究では，まず，音声案内装置の利用状況を解析し，人が立ち止まっているときに音声案内を繰り返してしまう過剰反応や周囲の音量に関係なく大音量で音声案内を行う過剰音量が騒音の原因であることが分かった。過剰反応に対しては，2つの焦電型赤外線センサを持つ知的人感センサを開発し，過剰反応を98.5％減少させることができた。過剰音量に対しては，周囲の音量によって音声案内の聞こえる音量を実験で求め，周囲の音量を計測しながら音量を調整する機能を開発した。この２つの機能により，従来よりも騒音に配慮した音声案内装置が実現できた。
キーワード: 視覚障がい者, 音声案内装置, 騒音, 焦電型赤外線センサ
Development of a Noise-conscious Voice Guide System
Mitsuyoshi MAEKAWA
Now that the voice guide system for people with a visual disability has become widely used, the noise that it produces is becoming a serious problem. First, we investigated situations in which voice guide systems were used, and found excessive response by the human detection sensor and excessive voice volume to be some of the causes of the noise. The excessive response brought about repetition of the voice guide even when people were not moving. The excessive voice volume was due to the fact that the volume was constant regardless of the ambient sound volume. Next, in order to reduce the excessive response, we developed a human detection sensor system with 2 PIRs (passive infrared sensors). It was confirmed that the excessive response was reduced by 98.5% by these sensors. In order to reduce the excessive voice volume, we developed a means of adjusting it based on measurement of the ambient sound volume. These two improvements enabled us to develop a voice guide system that is conscious of noise.
Keywords：people with visual disabilities, voice guide system, noise, passive infrared sensor
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