SU129686A1 - A method of measuring the ratio of a signal to a quasi-peak value of an interference by evaluating this ratio on an oscilloscope with the coincidence of the visible boundaries of the lower and upper peaks of the interference - Google Patents

Description

A method is proposed for measuring the ratio of the signal to the quasi-peak value of the interference when estimating this ratio on the oscilloscope screen at any place of the television path and at any part of the television raster by introducing calibrated reverse polarity (relative to the signal) at controlled points of the television path, Signal compensation and coincidence of the visible boundaries of the upper and lower peaks of interference are suspected. The sought ratio (for example, directly in decibels) is estimated by indications of an attenuator regulating the magnitude of the compensating pulses, creating a simultaneously mobile photon mark on the receiving screen in the image location under study.

Existing methods for measuring the ratio and signal to the quasi-peak value of the interference, for example, using an oscilloscope and calibrated rectangular pulses do not provide the necessary accuracy of measuring this ratio in any image area and the possibility of simultaneous measurements in different parts of the television path independently of one another without changing the input signal , as well as reading the desired ratio directly in decibels. The proposed method enables such measurements, improves their accuracy, and also accelerates the measurement process itself.

A possible block diagram of an apparatus for carrying out the described method is shown in FIG. one.

The measured video signals, in which the desired ratio should be determined, are fed to the input /. Through filter 2, they are fed to a broadband oscilloscope with a row selector 3 and to a video monitor 4. The filter is turned on if necessary to take into account the visual perception of interference. The attenuation frequency characteristic of this filter must take into account the superiority of visual interference from their frequency spectrum. The elements of the scheme, we, encompassing: No. 129686-2 and dashed lines, represent the device for forming pulses, creating a mobile brightness mark on the screen of the monitoring device 4.

To the input of the device 5 is applied, the string is synchronized and pulse. temporary nolozhennoe .: lazh change the phase shifter. 6 m within the length of one line decomposed image. The generator 7 generates linear rectangular frequency emulsions, the duration of which the molset is adjustable, and the younger front of these i-pulses is set by the temporary horizontal synchronous impulse, and after the phase-coupler 6. The device synchronous impulses are supplied to the input of the device 8. The phase shifter 9 n generator 10 performs functions similar to the one performed by the phase shifter 6 and generator 7.

The pulses received from the generators 7 and 10, the nodes on the CXCMV match, and the output of which forms one or more pulses, followed by the frequency of the rows. By adjusting with a calibrated potentiometer or an appropriate attenuator 12 of the magnitude of the pulse polarity, it is possible to get a dark mark on the raster of the video control device for any part of a single line or in the form of a touchpad with its equalization parties. Positions on the screen and its dimensions are adjusted by adjusting phase shifters 6 and 9 and generators 7 and 10.

Measuring the signaling of a sigia.la to a quasiic value of 1 Nomech by the described method can be performed, for example, in the following way. Suppose that an oscillogram of video signals containing a voltage drop between black and white levels has the form shown in FIG. 2a The position and the length of the compensating imiuls by the appropriate elements of 6, 7, .9, 10 (Fig. 1) are set so that they are located relative to the waveform of the video signals, and for example, as shown in Fig. 26. The magnitude of the computations (Fig. 26 - position /) is adjusted by changing the attenuation of the attenuator 12 to the occurrence of a drop in visible and on the oscilloscope of the upper and second peaks of the interference from the counter-line OO- (Fig. 2k - below and /). Then decrease the attenuation introduced by the attenuator until the computational control (Fig. 26 - position //) ensures that the lower and upper portions of the video signal (Fig. 2b - position //) are displaced. The desired relationship is determined, Nairi: 1p, non-effective in decibels as the difference between the indications on the scaler at the moment, corresponding to: the position of m / and // fig. 2c.

PRIORITY: l with t and z about b reet with 11 and

Measure the signal-to-quasi-peak signal ratio10 by interrogating this oscilloscope), which is the coincidence of the visible boundaries of the lower and upper peaks of the mesh, characterized by the fact that, in order to improve the accuracy of this assessment, in the corresponding lines of any participant to match each participant. the possibility of simultaneously conducting such imitations in different sections of the television path independently of one or the other without changing the input signal and the convenience of reading the desired ionization (i) e, directly in decib All of the visible boundaries of the upper and lower peaks of the nomeha are performed and, at the control points of the television path, the calibration of the reverse-zero calibration impulses is created at the points of the television path, created by the reference point on the screen at the measuring area and the area of the area of the eye and the area of the area of the area and the area of the area on the screen at the reference point on the screen at the measuring area and the area of the eye at the area of the area of the area and the area of the area at the center of the search area