Ghost cancellation circuit system

摘要

A ghost cancellation circuit system comprises an amplifier for forming an output signal of a composite wave of a direct wave and a ghost wave; a carrier wave extracting circuit for extracting the carrier wave having the reference phase from the output signals of the amplifier; phase shifting means for generating a detection axis signal having the specific phase of the output of the carrier wave extracting circuit; a pair of phase detection circuits for a phase detection of the output of the amplifier by the detection axis signal of the phase shifting means or the carrier wave extracting circuit, and a delay circuit for forming the output in delay for a time substantially equal to the delay time of the ghost wave by receiving the output of the pair of phase detection circuits through a pair of coefficient circuits, whereby at least a specific component of the ghost wave is cancelled by summing the output of the delay circuit to the output of the phase detection circuit.