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Abstract

An electronic siren emulates the sound of a mechanical siren using a dynamic algorithm and look up tables to generate a series of wave sets, each wave set including one fixed frequency wave and one variable frequency wave. A micro controller stores the algorithm and look up tables and executes the algorithm on command to produce a digital output emulating the mechanical siren. The digital output is converted to an analog signal that is applied to a class D amplifier. A switching power supply provides 70 VDC to the output stage of the amplifier. This arrangement produces 126 dB of sound pressure at a distance of 10 feet from the reverse folded horn speaker. The electronic siren generates little heat and requires only 10 amps of current from the vehicle electrical system.

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First Claim