SU1021018A1 - Fascimile data coding device - Google Patents

Abstract

DEVICE KODIRS © anija facsimile information comprising a timing generator and the second inputs of which are connected sootvetslvenno the first input unit upravpevv and vkodom formirovatep discrete fansimshii one signal output of which is connected to the second input unit at ravpeni, output connected to upravp yuoshm input of the code kombinatsny coordinates, characterized in that, with a noise immunity circuit, & the element OR is inserted into it, connected between the second output of the synchronous generator and the counting input of the driver of the code com- plex coordinates, the key included. between the third output of the synchrograph and the other input of the OR element, to the determinant of the code distance included between the output of the generator of the code combination of coordinates and the equal input of the switch. (L S 3. S ifai about X)

Description

Izofethene refers to the facsimile technique and is intended to encode the fsimile information in a legal way in a code manner.

There are known redundancy redundancies, (known at transmission / code: the com plex coordinates of the elements of the facsimile are shown relative to the beginning of the line. In these known devices, the computations are self-contained. As a result, scan line signals are separated by line synchronization signals. .

A device is known that contains a synchronous generator, the first and second outputs of which are connected respectively directly and via a discrete facsimile signal generator to the first and second control unit code, the output of which is connected to the control input of the forms (in this device, the synchronization signal, section To the signals of the -stretch lines (the signal of the beginning of the line), the corresponding form of the code combination is attached, KOfTopaa is easily distinguished from the signals at the reception. the coordinates of the image elements are generated by the shaper of the code combinations of the coordinates and the determination of the position of the element of the facsimile image on the line relative to the beginning of the line Ll 3

the disadvantage of the known device is the low quality of the facsimile copy in the presence of interference in the communication channel due to the low reliability of the selection of start-of-line signals in the receiver, since among the generating code combinations, there are those with which the code a combination of the beginning of a line is small, as a result of which there is a rather large HER probability of the transition of code combinations of the beginning of a line to a combination of coordinates and vice versa. For example, from E} (for experiments, for the case of transmitting an image of the type of meteorological information, with a length of coding combinations of coordinates and the beginning of line 11, the annual distance between 1 and the probability of error in channel 1, 4 -1O and 8 15 the probability of transition code commanding the beginning of a line into code combo coordinates is O, 5, O, O48 and O, 08c, respectively. Loss of the line start signal or its false occurrence leads to reoMe-TiMHecKHM distortion (narrowing

or extension) of the facsimile copy in the direction of the frame sweep and, in addition, the loss of the start of line signal leads to the recording of two lines of signals, 5 between which the start of the line signal is lost, on one side of the sweep, which leads to additional distortion of the facsimile copy and in the final result in the deterioration of its quality.

0 The purpose of the invention is to increase the pomeoso security.

The goal is achieved by the fact that the device containing a sync generator, the first and second outputs of which

5 are connected respectively to the first input of the control unit and the input of the discrete facsimile driver of the signal whose output is connected to the second input - the control unit, the output connected to the control input of the coder of the code combinations of coordinates, the OR element is inserted between. SECI111 output of the sikhrogenerator and C4eiv nym -.input of the generator of the code com- plexes of coordinates, a key connected between the third output of the synchro-generator and another input of the OR element, and the determinant of the code distance, switched on by the output of the generator of the coder

0 combinations of coordinates and control key input.

The drawing shows a structured GiteMQ device for encoding facial information.

5 Facsimile coding device .; Information contains sync generator 1,. the first and second outputs of which are connected respectively to the first input of the control unit 2 and the input of the generator 3 of the discrete facsimile signal. The output of the forwarder 3 discrete facsimile signal is connected to the second input of block 2, the control, the KoTotboro output connected to the ..

It is connected to the control input of the former 4 code combinations of coordinates. Between the BTopbiM output of the synchronous generator 1 and the counting input of the driver 4 code combinations of coordinates included

0 element 5 OR, the second input of which through the key 6 is connected to the third output of the clock generator. The control input of the key 6 is connected to the output of the code distance determinant 7, whose input is connected to the output of the 4 coordinate combinations of the code. The other code, 8, defines the code distance to enter a code combination starting the line. As a generator of combinations of coordinates 4, a binary counter of coordinates is used, it is named ki n +1 condition, where n is the number of faxes / izfazheksh on the scan line; 1 (h with co-ordinate coordinates with code points | 1 m; then from the code combination the beginning of the line is less than a specified one. The device will throttle backwards. To the counting input of the code generator 1 (for data 4 are received through apement 5 OR pulses with frequency / bcfetiation of the facsimile bp-f-channel F /. from the second output of the synchronizer 1 or pulses with a frequency much higher than P, the signals from the third E & a of the sync generator 1 are received through the control input of the cnc 6; output determinant 7 code spacing, passing pulses of high frequency if the code distance between the code combination of the co-ordinate formed in this piece and the code start of the line is less than one time. Each high frequency translates the counter into the next state, i.e., w 1 works with the slave code combination of a coordinate, the code distance of which is also checked by the code distance determinant 7. This continues with the texpore, P01Sh shaper 4 kodoa 1X lo s coordinate combinations will not work out a coordinate code combination with a powerful distance greater than the specified one. This entire procedure is performed during the frequency interval of the facsimile video dis-signalization. An opamp 7 of the code distance determines the code distance indicated by one ' i is one of the known methods. When arriving from the output, form 3 discrete facsimile signals to the second code of the unit 2 control unit (series of elements) of the facsimile, v signal, the information about the cat should be transmitted, the control unit 2 selects the signal that comes to the control of the code generator coordinates, lio to which the code combination of coordinates is currently formed, is fed to the output of the device. The synchronization of the form of 3 discrete facsimile signals is performed by sync pulses. pass / toto RD, coming from the second output of the synchro generator 1, and synchronizing to the central unit of the control unit 2, Lincolc pulses are produced, the frequency and / or phase of which may differ from R. It is possible to improve the quality of facsimile cadmium in the presence of interference in the communication channel by increasing the reliability of the selection of the line start signal at the receiving station, without the increase in the volume of facsimile information.

Claims (1)

Facsimile information encoding device, comprising a clock generator, the first and second inputs of which are connected respectively to the first input of the control unit and the input of the discrete facsimile signal shaper, the output of which is connected to the second input of the control tag, the output connected to the control input of the coder of coordinate coordinates, characterized in that , in order to increase noise immunity, an OR element is inserted into it, included between the second output of the clock generator and the counting input To coordinate code combinations key included .mezhdu sinhrogoneratora third output and the other input of the OR gate, and the code distance determiner connected between the output of the code coordinates and combinations upravlyayu-. key input. .SU U021018 J * f 1021018 2