Traffic signal system for blind people
First Claim
1. A traffic signal system for blind people installed in combination with a common traffic signal device for pedestrians, comprisinga signal generator circuit electrically coupled to a blue light of the pedestrian traffic signal device for generating an audible sound signal synchronous with lighting of said blue light,a noise detector circuit for detecting the surrounding noise,a volume control circuit connected to said signal generator circuit and said noise detector circuit for controlling the output of said signal generator circuit in accordance with the output of said noise detector circuit, anda speaker electrically connected to said volume control circuit, whereby an audible sound having a volume corresponding to the level of the surrounding noise is produced from the speaker.
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Abstract
A traffic signal system for blind people which can be combined with an existing traffic signal device the device having a sound signal generator electrically connected to a blue light of the pedestrian traffic signal device for generating a signal representative of imitation sound synchronous with lighting of said blue light, a noise detector, a volume controller for controlling the output of the signal generator in accordance with the detected noise signal of the noise detector, a control gate for preventing the noise signal of said noise detector from being supplied to the volume controller when the generator is on, and a speaker for emitting imitation sound having a volume corresponding to the level of the surrounding noise.
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Citations
16 Claims
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1. A traffic signal system for blind people installed in combination with a common traffic signal device for pedestrians, comprising
a signal generator circuit electrically coupled to a blue light of the pedestrian traffic signal device for generating an audible sound signal synchronous with lighting of said blue light, a noise detector circuit for detecting the surrounding noise, a volume control circuit connected to said signal generator circuit and said noise detector circuit for controlling the output of said signal generator circuit in accordance with the output of said noise detector circuit, and a speaker electrically connected to said volume control circuit, whereby an audible sound having a volume corresponding to the level of the surrounding noise is produced from the speaker.
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4. A traffic signal system for blind people installed in combination with a common traffic signal device for pedestrians comprising
an imitation sound signal generator circuit electrically coupled to a blue light of the pedestrian traffic signal device for generating an imitation sound in accordance with lighting of said blue light, a noise detector circuit for detecting the surrounding noise to give a noise signal, a volume control circuit connected to said signal generator circuit and said noise detector circuit for controlling the output of said signal generator circuit in accordance with the level of the detected noise signal, said volume control circuit including a delay circuit, a control gate coupled between said signal generator circuit, detector circuit and volume control circuit for cutting off the output of said noise detector circuit when said signal generator circuit produces a signal and for applying the output to said volume control circuit when said signal generator circuit produces no signal, and a speaker electrically connected to said volume control circuit for emitting imitation sound, whereby the output of said noise detector circuit is applied to said volume control circuit with a delay after said signal generator circuit is interrupted.
Specification