A signal matching signal substitution system includes a tuner for selectively receiving signals in respective television channels with an input gain control for controlling the signal output level of the tuner. The system substitutes television signals in a substitute channel in lieu of normal signals in a normal channel selected by a viewer. The system has a component for determining the input signal level of currently received signals in a currently received channel and generating a current am…

A signal processing method for an analogue picture signal is proposed. In this case, the analogue picture signal originates from a computing unit (10) in which the signal was generated digitally in accordance with a graphics standard such as, for example, EGA or VGA and was subsequently converted into analogue form. The method consists in subjecting the analogue picture signal to analogue/digital conversion at a first chosen sampling frequency, after which the sampled picture is then investigate…

A signal encoder and a signal decoder involves the signal encoder for receiving a data signal and a clock signal, including a first code output terminal and a second code output terminal. When the data signal is logic one, the signal encoder outputs a modulated signal through the first code output terminal, and outputs a fixed level signal through the second code output terminal. When the data signal is logic zero, the signal encoder outputs the fixed level signal through the first code output t…

Provided is a signal processor for converting a signal that converts a return to zero (RZ) signal into a non-return to zero (NRZ) signal, in which two 2R (re-amplifying, re-shaping) regenerators are connected in parallel between an input waveguide and an output waveguide with different lengths from each other. The 2R regenerator includes: two semiconductor optical amplifiers having different lengths from each other; and phase control means connected to a short semiconductor optical amplifier. Th…

A signal transmitter and a signal receiver comprises a time base compression part (101) for compressing an audio signal on a time base to output the compressed signal as a time base compressed audio signal and a multiplexing part (102) for multiplexing a video signal, a control signal, and the time base compressed audio signal to output the multiplexed signal to the external as a video/audio control multiplexed signal. The thus constituted signal transmitter and the signal receiver realize a sig…

A signal encoded with three superimposed binary codes is divided into a petermined number of parallel lines equal to the number of bits in the first code and passed to a second code correlator. Each parallel output of the second code correlator is sampled and stored in a corresponding row of a core storage matrix so that each row of the matrix contains a history of the polarity of the corresponding signal. The bits stored on each row represent the third code sequence while the overall polarity o…

A circuit for converting a diphase signal into an isochronous baseband data signal, operates by extracting a clock signal from the carrier signal and combining the diphase signal and clock signal in a modulo-2 adder. The clock signal has a frequency equal to the reciprocal of the duration of one element of the baseband data and is derived by isolating a second harmonic of the carrier signal and applying it to a frequency halving circuit. The relative phase of the clock signal and the isochronous…

A fiber length analyzer is disclosed that detects the various lengths of fibers present in a liquid medium and converts data representing these fiber lengths into a distribution related to the range and relative number of different fiber lengths present in the medium.

A two-way telephone communications system passes signals of one frequency in one direction and transponds with signals of four frequencies in the other direction. The individual signals have a predetermined frequency and have a coded duration. The invention provides a system for recovering, or regenerating, the original signal without introducing frequency shift and without changing the duration of the signal.

There is provided a signal generator suitable for use in a light signal transmitter for television receiver remote control means and the like. It has an oscillating circuit supplying an oscillation output across the base and emitter of a transistor through a resistor, the resistance of the resistor being appropriately preset, whereby a steady and stable amplitude of the output signal of the generator may be maintained irrespective of variations of the power supply voltage.