System for detecting the siren of an approaching emergency vehic

Details System for detecting the siren of an approaching emergency vehic System for detecting the siren of an approaching emergency vehic

1992-08-11

1994-02-15

Richardson, Robert L.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 41, 395 24, 340902, 340907, G10L 500

Patent

active

052874117

ABSTRACT:
A siren detection system controls the lights at an intersection to direct traffic and permit an emergency vehicle to travel through the intersection unimpeded. The system determines the frequency of the sound emanating from a siren carried by the emergency vehicle by counting pulses that indicate the frequency of the sound, by determining the elapsed time necessary to count a selected number of pulses, and by utilizing the elapsed time and number of pulses counted to determine the frequency of sound emitted by the siren.

REFERENCES:
patent: 4625206 (1986-11-01), Jensen
patent: 4626849 (1986-12-01), Sims
patent: 4785474 (1988-11-01), Bernstein et al.
patent: 4806931 (1989-02-01), Nelson
patent: 4956866 (1990-09-01), Bernstein et al.

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