Compagnie Industrielle Des Telecommunications Cit-alcatel

Societe Anonyme, Compagnie Industrielle Des Telecommunications

Henri Brzozowski

Pierre Franco

Apparatus for reducing the intermodulation noise generated in a chain of amplifiers. The apparatus includes a first phase-shift circuit for at least partially compensating for the phase distortion and phase jumps in the chain and a balancing circuit including a source of compensating noise. The compensating noise is inverted, then added to the original signal to cancel the distortion generated in the chain. In one embodiment, the source of the compensating noise is a series of amplifiers and phase-shift networks which simulate the transmission characteristics of the actual amplifier chain.

Circuits for reducing intermodulation noise

The invention relates to a device for the remote adjustment of a switchable network equipping an unattended station on a transmission line, by means of remote control frequencies emitted from a terminal station on this line. The device enables the remote control of a motor actuating a switch which operates said switchable network. The moving of the switch, and then the adjusting of the network, can be followed at the terminal station from the observing of the level of a return frequency sent back from the unattended station to the terminal station.

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Colombes, France

Henri Brzozowski