Abstract: A TV distribution equipment includes at least one stabilizer (1) associated with a signal processing circuit (2A) suitable for transmitting TV signals to one channel of a cable TV network. The synchronizing signals in said one channel are subject to interference which may be external (e.g. received on the air from a nearly TV transmitter) or internal (e.g. intermodulation from other signal processing equipments 2B, 2C, 2D). The stabilizer (1) includes a frequency comparator (10) and a phase comparator (28) connected in parallel with their inputs arranged to receive a first signal from the associated signal processing circuit (2A) and a second signal representative of the interfering synchronizing signal. The outputs of the comparators are combined to control the frequency of a local oscillator that governs the synchronizing signals produced by the one processing circuit (2A).

Abstract: A system for automatically substituting television signals from different sources at a station for applying signals to a cable TV network. The substitution system (10) includes at least one switch (9) inserted between the cable network and the outputs of at least one signal processing equipment (1,4) and of at least one signal generating equipment (6) which feed the network, as well as at least one synchronizing signal detector (8) connected to a processing equipment output and suitable for controlling the switch associated with said processing equipment to control making and breaking of the link between the processing equipment and the network.