SU815967A1 - Device for automatic monitoring of quality parameters of television channels - Google Patents

Description

(54) AUTOMATIC MONITORING DEVICE OF QUALITY INDICATORS OF TELEVISION CHANNELS which is connected to the first input of the comparison unit with a tolerance, the first output of which is connected to the control input of the control validation unit, and the second output is connected to the first input of the inhibitor unit, the output of which is connected to the first input of the display unit , while the output of the control validation unit and the output of the self-control unit are connected respectively to the first and second inputs of the control condition checker, the output of which The switch is connected to the second inputs of the prohibition unit and the display unit; a switch, a deciding unit, a memory unit, an interference protection unit and a digital-to-analog converter are inserted, each of the n-outputs of the comparison unit connected to the corresponding information input of the switch, the output of which is connected to the first the input of the solver unit, the first output of which is connected to the first input of the memory unit, the first output of which is connected to the second input of the decision unit, and the second output of the memory unit is connected through the interference protection unit to the third in by the progress of the decision block, while the third output of the memory block is connected simultaneously to the discrete input of the self-control unit and to the input of a digital-to-analog converter, the output of which is connected to (n- | -1u1m input of the comparison unit, in addition, the fourth output of the synchronization unit is connected to the second input of the unit memory, and the fifth (the course of the synchronization unit is connected to the control input of the switch, in addition, the fourth output of the memory unit is connected to the second input of the comparison unit with the tolerance. . The drawing shows a structural electrical circuit of the proposed device. The device for the automatic monitoring of television (TV) channel quality indicators contains an analog processing unit 1, a control validation block 2, a synchronization block 3, a comparison block 4, a switch 5, a decisive block 6, a memory block 7, a digital-analog converter (D / A converter) 8, a block 9 protection against interference, comparison unit 10 with tolerance, tolerance setting unit 11, prohibition unit 12, display unit 13, control condition check unit 14, self-checking unit 15 and identification unit 16. The device for automatic control of quality indicators of TV channels works as follows. An image signal is received at the input of the device with control signals of test lines introduced into its structure. In block 3, the synchronization signal of the TV receivers is selected and a sequence of control pulses is generated, determining the time sequence of operation of the device blocks and the sequence of their interaction. Block 2 reveals the conditions under which the accuracy of the automatic control device is broken and the results of the control are unreliable. Such conditions, for example, can be: breakdown of the image signal, alarm level of the image signal, absence of control signals of test lines. When these conditions occur, also when the device goes out of operation, detected by block 15, block 14, on the basis of the data of mutual analysis of signals from block 2 and block 15, excludes the issue of control results to block 13 and, c the other hand, on the same block 13 displays the situation. The elimination of the results of monitoring is carried out using block 12. At the same time, the results of operation of block 14 and block 12 are output to the data transmission channel, to the input of a computer, to automatic registration. In the proposed device, quality control of TV channels is carried out based on the test method of these channels in a dynamic mode by detecting and analyzing distortions of a number of image signal parameters (e.g. frame damping pulse. The detection and analysis of signal parameters starts from block 1. In block 1, a series of transformations of the input signal are performed in order to: a) reduce the degree of influence of interference (as a rule, by filtering the signals); b) isolating the distortions introduced by the TV channel and contained in the signal in an implicit form (for example, performing phase detection of a sinusoidal nozzle of a step signal, filtering out fluctuation interference in the required frequency band, separating low-frequency distortion and interference from the full TV signal, etc.) . Next, block 4, switch 5, the decisive block 6, block 7, block 9, D / A converters 8, form a circuit that provides tracking of parameters, execution of parallel-serial control operations, averaging of tracking results and their memorization. Due to the proposed connection of these blocks, all control operations are reduced to the same type, performed mainly in single blocks 6, 7, 9 and DAC 8 by using the principle of temporal and spatial information compilation that is circulating and stored in these blocks. The signals, which are the results of analog processing of the input signal, are fed to the parallel inputs of block 4. The other inputs of block 4 sequentially receive analog signals.

voltage from the output of the DAC 8. The issuance of codes corresponding to the results of monitoring the value of monitored parameters is carried out by block 7, controlled by block 3. Block 3 performs a sequential selection of the results of tracking the corresponding parameter. At the same time, unit 3 switches the switch 5 in order to ensure that the comparison results are output to a single decisive unit 6. Depending on the comparison results of the signal corresponding to the amount of distortion of the parameter being defined, and the voltage supplied by the DAC 8, the unit is added to the code controlling the DAC 8, or subtracting the unit, which ensures tracking of each parameter in real time. The processing results are assigned to block 7 in order to:

a) with each repetition cycle of the input signal component of interest, provide an iterative approximation to the actual value of the parameter;

b) store the obtained values of the parameters for their subsequent use.

An iterative approximation to the actual value of the parameter is carried out as follows. C. On the one hand, a binary digital code characterizing the results of the approximation performed in the previous cycle is issued to decision block 6 and recorded there. On the other hand, the same code is converted to analog form using the DAC 8 and is supplied for subsequent comparison with the signal that limits the parameter to block 4. The above input-output operations of the binary code in decisive block 6 allow to obtain a sequential approximation to the true value of the parameter. The presence in the signal, which characterizes the displayed parameter, of fluctuation interference, to some extent suppressed in block 1, leads to the random nature of the results of each approximation. Therefore, in a deciding unit 6, an additional averaging of the results is performed each time a comparison operation is performed. Namely, at. This correction of the code characterizing the magnitude of the approximation to this parameter is carried out after the n - fold addition (or subtraction) of the comparison results in decision block 6 (where n is the degree of averaging). Such an operation is performed continuously based on the use of recurrent calculations.

It is obvious that the provision of the necessary reliability of quality control of TV channels requires the implementation of averaging, depending on the level of interference. The known automatic control devices are calculated on the case of the presence of interference with the highest permissible level, from which the degree of averaging and, accordingly, the speed of control operations are determined. At that. At the same time, if we take into account the real (current) value of fluctuation noise, then the degree of averaging can be varied to ensure the required reliability of control. This is achieved in the proposed device by introducing an additional block 9. On the one hand, the input of the block 9 is from the output

0 of block 7, a digital code characterizing the magnitude of fluctuation noise (defined as one of the parameters of the TV channel) is received. Based on the inherent algorithm for analyzing these data, an averaging degree is automatically selected. The corresponding control signal, on the other hand, is outputted to the decision block 6. This control signal makes the current change in the multiplicity of recording the comparison results before the next correction of the result of the approximation and contributes to an increase in the speed of the control operations.

Storage of the obtained parameter value; The operation carried out in block 7 is necessary to ensure the subsequent association of these codes with the codes defined by block 11. This operation is performed in block 10. The results of the comparison, which are the results of the automatically performed tolerance control

(j quality indicators of TV channels are transmitted through block 12 above to block 13 and the device output. In addition, the results of block 10 are used in block 2 to eliminate the output of control results for those 11 parameters that are unreliable with this input signal.

The unit 16 selects from the input signal of the identification location pulses the introduction of the test lines into the TV signal, the indication and the issuance of the relevant information.

Claims (1)

Invention Formula A device for automatically controlling the quality indicators of television channels containing an analog processing unit, a control validation unit, a testing unit and an identification unit, whose inputs are paralleled, with each of the n outputs of the analog processing unit connected to the corresponding input of the comparison unit, and the first, second and the third outputs of the synchronization unit are connected to the corresponding control the inputs of the control validation unit, the self-checking unit and the identification unit, which also contains the tolerance setting unit, the output of which is connected to the first input of the comparison unit with the tolerance, the first output of which is connected to the control input of the control validation unit, and the second output is connected to the first input of the inhibit unit whose output is connected to the first input of the display unit, while the output of the control validation check unit and the output of the self-monitoring unit are connected respectively to the first and second inputs of the control unit check of control conditions, the output of which is simultaneously connected to the second inputs of the prohibition unit and the display unit, characterized in that, in order to increase the reliability of the control, a switch, a decision unit, a memory unit, a protection unit against noise and a digital-to-analog converter are entered, Each of the n outputs of the comparison unit is connected to the corresponding information input of the switch, the output of which is connected to the first input of the decision unit, the first output of which is connected to the first input of the memory unit, the first input of which is connected The second output of the memory unit is connected via the anti-interference block to the third input of the decision unit, while the third output of the memory unit is connected simultaneously to the discrete input of the self-control unit and to the input of the digital-to-analog converter whose output is connected) - 1) by the input of the comparison unit, in addition, the fourth output of the synchronization unit is connected to the second input of the memory unit, and the fifth output of the synchronization unit is connected to the control input of the switch, in addition, the fourth output of the memory adapter nen a second input unit with a tolerance comparison. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 261488, cl. G 01 R 13/00, 1969 (prototype).