Noise eliminating circuit

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a noise eliminating circuit in which the above-mentioned disadvantages and drawbacks have been eliminated.
In accordance with the above and other objects, the invention provides a noise eliminating circuit comprising a subsignal demodulator circuit for demodulating a subsignal from a composite multiplexed signal containing a main signal and a subsignal, a matrix circuit for effecting arithmetic operations upon the main signal and the demodulated subsignal from the subsignal demodulator circuit so as to produce first and second output signals, and a sample-and-hold circuit interposed between the subsignal demodulator circuit and the matrix circuit in the signal paths of the subsignal for sampling and holding the demodulated subsignal in response to a signal synchronized with at least one of a noise detection signal and a noise component contained in the subsignal.