PREMODULATION FILTER FOR GENERATING IN COMBINATION WITH A FM TRANSMITTER A GENERALIZED TAMED FREQUENCY SIGNAL

摘要

A transmitter for transmitting a carrier whose frequency is modulated by pseudo five-level signals. In order to obtain a simple receiver and an improved signalto-noise ratio, a substantially three-level signal is generated in the transmitter at the detection instants t = (2m-1)T/2 by means of a pre-modulation filter.