Sound pattern discrimination system

Details Sound pattern discrimination system Sound pattern discrimination system

1988-01-25

1989-02-21

Crosland, Donnie L.

Communications: electrical

Traffic control indicator

340902, 340906, 367199, 381 56, G08G 1095

Patent

active

048069310

ABSTRACT:
A system is provided for the detection and recognition of pre-established sound patterns such as the various patterns produced by the sirens of emergency vehicles. The system includes a microprocessor which programmed with pre-established sequence detection algorithms corresponding to the different types of emergency vehicles sirens signal patterns which are to be recognized. A first omnidirectional microphone is coupled through a bandpass circuit to a trigger circuit to produce square wave signals representative of analog signals in the band of interest. At least two directional microphones are coupled through similar bandpass amplifier circuits to analog digital converters which produce a digital output representative of the strength of the signals received by the directional microphones. This directional information along with the output of the Schmitt trigger is supplied to the microprocessor which is used to control the signal lights at an intersection in response to the detected siren.

REFERENCES:
patent: 3992656 (1976-11-01), Joy
patent: 4212085 (1980-07-01), Vaillancour et al.
patent: 4625206 (1986-11-01), Jensen
patent: 4759069 (1988-07-01), Bernstein et al.

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