Remote volume control by means of frequency modulation feedback loop

摘要

A TV frequency modulation feedback loop (FMFB) remote volume control includes an RF input and a mixing means with the RF input being connected to and providing one input for the mixing means. A voltage controlled oscillator is connected to the mixing means and provides the other input thereto. The output from the mixing means is an IF FM sound signal which is connected to a demodulator. A remotely operable deviation control is connected to the output of the demodulator for changing the amplitude of the demodulated sound signal. The deviation control is connected to and provides a deviation controlled input for the VCO.