SU624380A1 - Device for monitoring facsimile apparatus phasing - Google Patents

Description

(54) DEVICE FOR THE CONTROL OF THE PHASE OF THE FAX CIRCLE

The invention relates to radio engineering and can be used in transmission systems of facsimile images of gas strips.

A device for monitoring is known.

facsimile device phasing, containing a pulse shaper of the test signal of synchronous frequency and shaper of receiver receiver phase pulses, the output of each of which is connected respectively to the first and second inputs of the first element And, and the second element And, the first input of which is connected to the output of the level generator of the pulse package test signal, and the second to the output of the video signal source fll.

However, in order to promptly eliminate the cause of skewing (of the sweepers, it is necessary to more accurately determine the place of its occurrence, which is not provided by a known device.

The purpose of the invention is to improve the accuracy of control formation by increasing

accuracy of determining the source of the rasfair ovani.

For this; In the proposed device for monitoring the phasing of the facsimile apparatus, P signal transducers were introduced, AND pulse shapers and an OR element, the output of which is connected to the input of the pulse shaper of the test signal, and each of the C inputs of the OR element is connected to the corresponding shaper outputs the phase position of the pulses of the test signal, to the first input of each of which is connected the output of the corresponding sensor-signal converter, and to the second input - the output of the driver the duration of the phase pulses of the receiver, and the output of the first element AND is connected to the (H +1) input of the element OR.

The drawing is structural; electrical circuit of the proposed device.

Claims (1)

Device for Phasing Control fax machine contains shaper 1 pulse width of the test signal of synchronous frequency and shaper 2 duration of the receiver phase pulses, the output of each of which is connected respectively to the first and second inputs of the first element of the IZ, and the second element 4, the first input of which is connected to the output of the shaper 5 level a packet of pulses of the test signal, and the second to the output of the video signal source 6, ft of the sensor-converter 7 signals, tt of the formers 8 of the phase position of the pulses and the element OR 9, the output of the last it is connected to the input of the driver of the 5th level of the pulse packet of the test signal, and each of the II inputs of the element OR 9 is connected to the corresponding outputs of the driver of the 8 phase position of the pulses of the test signal, the first input of each of which is connected to the output of the corresponding sensor -7 signal and to the BTopo.vy input, the output of the imager 2 is the duration of the phase pulses of the receiver, and the output of the first element AND 3 is connected to the (H + 1) input of the element OR 9. The device works as follows If the monitored signals do not have their own Settings, then formed at the outputs of the respective DC voltage U-transmitters 7, which is provided to form rovateli 8 polozhent1} gmpulso phase control. At the inputs of these drivers 8, triggered by the second input by the leading edge of the phase pulse of the receiver formed by the duration of the former 2, pulses are generated with the length chosen in such a way that the CT01 / rear edges of them are shifted in synchronism with the frequency. This first pulse is extracted by the receiver 2 phase pulse generator and the And 3 element, and is intended to roughly determine the source of the dephasing: transmitter or receiver From the outputs of the drivers 8. The pulses are intended for recording and are carriers of information about the parameters of signals of monitored areas. synchronization system. These impulses from the outputs, the formers -8 arrive at 11 inputs of the element OR 9, tia (C 1) input a pulse of the synchronous frequency signal comes in, From the output of the element OR 9 the pulses go to the input: the transmitter of the test-signal pulse level 5 and further through ele 6O4 ment And 4 together with the video signal from the source of the video signal 6 follow to the recording device. If at least one of the signals of a certain part of the synchronization path changes a monitored parameter, then the output voltage of the corresponding transducer 7 changes in the direction of increase or decrease. Then, in the first case, the pulse from the corresponding phase positioner 8 changes its phase position in the direction of lag, and in the second case in the direction of advance. In the case of line by line, these changes are in the form of a curvature or jitter of the corresponding line of the test signal. The amplitude of these curves: the curves or jitters and the coordinate of their position over the image frame will show the magnitude and time of the occurrence of the deviation of the monitored parameter, and the line number indicates the place of origin. Thus, the first of the recorded lines can be used to determine the source of the skew - transmitter or receiver, for the rest - more precisely the place where the deviation of parameters occurs in the synchronization path. If the second, third, etc. the test lines do not change their curvature, and skewing occurs due to the fault of the receiver, as evidenced by a change in the curvature of the first test line, this means that the cause of skewing is caused by problems with the mechanical components of the sweep drive. Apparatus of the Invention A device for monitoring the phasing of a phase array device containing a pulse width driver, a test signal. Of a synchronous frequency, and a receiver phase pulse length driver, the output of each of which is connected respectively to the first and second inputs of the first And element, and the second And element , the first input of which is connected to the output of the pulse level generator of the test-signal pulse, and the second input to the output of the video signal source, characterized in that, in order to raise the 5C accuracy of the phase control by increasing the accuracy of determining the source of skew, rt of the sensor signal transducers, C phase formers, pulses and the element IL1 are introduced, the output 562 of which is connected to the input of the pulse level generator of the test signal pulse, and each of the If inputs of the OR element is connected to the corresponding outputs of the phase generator of the test signal pulse, to the first input of each of which the output of the corresponding sensor-converter is connected, and to the second input - the output of the test signal l synchronous frequency 0cr3oSi fe imp / ugs rfpueMHUifO O Rovatel of the phase pulses of the receiver, and the output of the first element AND is connected to (ff 1) the input of the element OR, Sources of information taken into account during the examination: 1, Express information, exchange of experience Telegraph communication, CITYinforms, M. , 1973, p. 2, Fig. one.