H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/217 (2006.01) H04M 9/00 (2006.01)
Patent
CA 2124976
ABSTRACT An audio amplifier for telephone-sourced audio signals that drive paging speaker employs 21 class D amplifier and a state variable feedback network, which monitors voltage and current levels of an audio output filter to which the paging speakers are coupled, so as to adjust the operation of the amplifier circuit, to compensate variations in the speaker loading of the audio output filter. The class D amplifier includes a pulse width modulator, which control the switching of a power Hbridge-configured switching circuit. The switching circuit sources and sinks current with respect lo the paging speaker load. The output of the power bridge switching circuit is a high energy square wave-type signal, which is filtered in a downstream audio filter to remove the switching transients and preserve the desired voice paging signal for application to the paging speakers. The state variable feedback network monitors variations in current flow and voltage at a plurality of circuit locations.
Mistry Yogi L.
Wagner Randall M.
Harris Corporation
Oldham Edward H.
LandOfFree
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