Remote controlled receiving apparatus which prevents erroneous operation due to noise

Claim 1

A remote controllable receiving apparatus comprising a receiver unit for receiving an incident signal wave, a plurality of frequency selection circuits which are respectively tunable to a plurality of different control frequency components contained in the received signal wave For control of the apparatus, a plurality of detector circuits for detecting first output signals supplied from said frequency selection circuits respectively, said detector circuits having respective output terminals for providing second output signals corresponding to said first output signals, a plurality of switching circuits, each including a first transistor, for turning on in response to said second output signals of said detector circuits above definite levels thereof respectively, a plurality of controllable devices which are on-off controlled by the respective switching circuits, an inhibit circuit for detecting AC noise components included in the second output signals of said detector circuits to turn off said switching circuits, and first capacitor means, connected between ground and the base of said first transistor and between ground and said output terminals of said detector circuits, for retarding the turn-on of said switching circuits to avoid the turn-on of said switching circuits due to the AC noise components and to allow the turn-on of said switching circuits due only to the control frequency components, said first capacitor means being connected to said inhibit circuit to discharge through said inhibit circuit when the AC noise components are detected.