- Oak Brook IL, US Lonnie Moravetz - Lincoln NE, US David L. Corey - Crown Point IN, US Robert Steiert - Crete IL, US
Assignee:
Federal Signal Corporation - Oak Brook IL
International Classification:
H04R 17/00
Abstract:
A tone generation system includes a square wave signal generator configured to generate a first series of square wave signals to replicate a fundamental frequency of a desired mechanical tone, and a second series of square waves signals to replicate a second harmonic of the desired mechanical tone. An amplifier is configured to receive the first and second series of square waves, and a speaker is connected to receive an output signal from the amplifier.