JPS5810947A - Relay system for signal transmission and reproduction - Google Patents

Abstract

PURPOSE:To reproduce and relay a start-stop synchronizing signal without code distortion, by taking the synchronism with sampling pulses through the pickup of a reproducing timing at each prescribed time. CONSTITUTION:A synchronizing signal detection circuit 4 receives a demodulation signal (a) from an input terminal IN and outputs a synchronizing signal (b). The 1st output (d) of the signal (b) sets a reproducing timing pickup inhibiting timer 3, resets a reference sampling pulse generator 2, restores the timing of a reproduction sampling and provides no distortion for a reproduction output signal (e) from a reproducing circuit 5. The timer 3 provides no signal (b) to the generator 2 for a prescribed time (c) and the relay of the relayed signals is performed with the circuit 5 by the sampling pulses obtained from the said synchronism.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission regenerative repeating system in an asynchronous signal transmission system in which signal transmission is performed by repeating multiple transmission lines.

Conventionally, in the signal multiplex transmission method that multiplexes and transmits signals and codes, the start-stop synchronous signal transmission method uses a large number of relay points (terminals) T to perform signal transmission, as shown in Figure 1. When a signal is demodulated, modulated again, and retransmitted, the signal or code may be distorted, resulting in a code error, making it impossible to reproduce the signal.

The present invention has been made to solve the above-mentioned problems, and its characteristics are that the reproduction timing is extracted using a synchronization signal at one or more relay points of the signal transmission path, and the sampling pulse is In addition to synchronizing and regenerating code with zero code distortion, timing extraction is prohibited for a predetermined period of time after timing extraction, and the reproduction timing is extracted again using a synchronization signal after a predetermined period of time, and the sampling pulses are resynchronized. This is due to the provision of a repeating regenerative repeater.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 2 is a diagram schematically showing the configuration of an embodiment of the signal transmission regenerative relay system of the present invention. In FIG. 2, reference numeral 1 denotes a black pulse generator, which generates, for example, a 2 KHz black pulse. Reference numeral 2 denotes a reference sampling pulse generator, which is composed of, for example, a counter. 6 is a reproduction timing extraction prohibition timer that resets the reference sampling pulse generator 2 to return the reproduction sampling timing to its original state and prohibits reproduction timing extraction for a predetermined time; 4 is a demodulation from a demodulator (not shown); A synchronizing signal detector detects a synchronizing signal of a signal, 5 is a reproducing circuit, IN is a demodulated signal input terminal, and OUT is an output terminal of the reproducing circuit 5, which is connected to the input terminal of a modulator (not shown). .

FIG. 3 is a time chart for explaining the operation of this embodiment, in which (a) is a demodulated signal, (b) is an output signal of the synchronization signal detector 4, and (C) is a timer for inhibiting reproduction timing extraction. 3, (d) is a reproduction timing signal output when the reproduction timing extraction prohibition timer 3 is set, and (e) is an output signal of the reproduction circuit 5.

Next, the operation of this embodiment will be explained.

2 and 3, the demodulated signal (a
) is input to the synchronizing signal detector 4 through the input terminal IN, the synchronizing signal detector 4 detects and outputs the synchronizing signal (b). The first output of the synchronization signal (b) sets and activates the reproduction timing extraction prohibition timer 6, and at the same time resets the reference sampling pulse generator 2 to return the reproduction sampling timing to its original state, thereby ensuring that the signal is not distorted or distorted for a certain period of time. Play with zero sign distortion.

The output after the first output of the synchronization signal (b) is performed during a predetermined period determined by the playback sampling prohibition timer 6 (the period immediately before a code error occurs due to a deviation in the timing of transmission and playback relay). is prohibited, and when the predetermined period has elapsed, the synchronizing signal (b) is output again, and the first output sets the reproduction timing extraction prohibition timer 3, and at the same time resets the reference sampling pulse generator 2 again and reproduces the signal. Restoring the sampling timing. Thereafter, this operation is repeated to output the reproduced image (e) as shown in FIG. In this way, the demodulated signal (,) is determined by the reproduction timing signal shown in FIG. 3 and is input to the modulator as the reproduction output (e).

As explained above, according to the present invention, it is possible to reliably reproduce the signal distortion or code distortion with zero for a predetermined period of time after the first synchronization signal is detected. Transmission becomes possible.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional asynchronous multiplex signal transmission system having multiple relay points, and FIG. 2 is a block diagram showing the configuration of an embodiment of the signal transmission regenerative relay system of the present invention. FIG. 3 is a time chart for explaining the operation of this embodiment. 1 Black pulse generator 4 Synchronous signal detector 5 Regeneration circuit fN O11 signal λ power terminal OUT/Reproduction output layer f agent Patent attorney Aki 1) Collection Ki'1

Claims (1)

[Claims] In an asynchronous signal transmission system that transmits signals by repeating multiple transmission lines, the reproduction timing is extracted using a synchronization signal at one or more relay points on the transmission line, and the sampling pulses are synchronized to eliminate code distortion. Regeneration relay that reproduces the code of O, prohibits timing extraction for a certain period of time after extracting the timing, and repeats the procedure of extracting the reproduction timing again using the synchronization signal after the predetermined period of time and resynchronizing the sampling pulse. A signal transmission regenerative relay system characterized by the provision of a receiver.