Traffic signal system for blind people

Details Traffic signal system for blind people Traffic signal system for blind people

1978-03-15

1981-02-24

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 22, 340327, 340328, 116 63R, 455234, G08G 100

Patent

active

042530830

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.

REFERENCES:
patent: 2260315 (1941-10-01), Halstead
patent: 3495213 (1970-02-01), Nahas
patent: 4025922 (1977-05-01), Trawick

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