SU477559A1 - Device for measuring output parameters of a television transmitting station - Google Patents

Description

A device is known for automatically measuring the output parameters of a television transmission transmitter comprising a series-connected high-frequency block, including a video detector, a selection unit that selects signals corresponding to a characteristic level of the radiated image signal, a unit of parallel analog processing of selected signals, a switch A-digital converter, and a digital indicator, as well as a control unit. Such a device is complicated and has a low measurement accuracy, since the principle of its construction involves the extraction of signals corresponding to characteristic levels of the emitted image signal, analog processing of these signals in separate channels and the subsequent calculation of relative magnitudes using an analog-digital converter.

In order to improve the accuracy of measurement and enhancement of functionality, a switch with inputs connected to a video detector, a carrier detector of audio signals and a peak detector, a control input connected to a program block, and an output through a series-connected pulse modulator, amplifier and circuit are introduced into the proposed device. fixing the level of synchronizing pulses 1B -

one of the inputs of the switch, the control input of the latching circuit of the synchronizing signals is directly, and the control input of the pulse modulator is connected to one of the outputs of the latch pulse former and the second switch through the driver of the building signals. One input of the latter is connected to the output of a pulse modulator, the other through a phase inverter to the output of a circuit for fixing the level of synchronizing signals, and the output through a circuit for fixing the level of damping pulses, the control input of which is connected to another output of the imaging unit of fixing pulses, with one of the inputs switch. In addition, a color synchronization block was added to the device, the input of which is connected to the output of the leveling circuit of the synchronizing signals, and the output - iK to the inputs of the switch, the matrix connected to the outputs of the counter, and a limiter. The inputs of the limiter are connected to the outputs of the matrix and the switch, and the output is connected to the input of the counter.

FIG. 1 shows a block diagram of the described device; in fig. 2 shows time diagrams for the principle of its operation.

Using a loopback link located in the feeder of the image signal transmitter,

high-frequency signal through input I is fed to video detector 1, the load of which is allocated a full video signal a (see Fig. 2), which contains sync block b and line frequency, zero signals, color synchronization signals and the actual video signal consisting of luminance signals g and colors (d. (Fig. 2) shows the osci.1.1ograms, but removing the principles of 0b). The operation of the video signal of the color television signal is SECAM. The processing of video signals from other color television systems can be done in a similar way. On the right, the oscillograms in one of the lower-case intervals are shown in uve.chiteyny scale).

The zero zero-c line corresponds to the zero carrier in the radiation signal. FIG. Figure 2 shows the characteristic levels of off-chip, which determine the output pa) a: meters of the image signal transmitter: Luc, Unt - compliance with carrier span at the level of synchronizing and fading signals, Line - span of the full video signal of black-and-white television, (Amplitude of synchronized and im- c, Ufi-j, and i), i-sweeps of the color-lock sipgals in the rows corresponding to the D / and D c signaling. In this case, the intention is to subject the power of the transmitter of the image signals, proportional to the square of the size, with

orders f / iii-, modulation depth tn

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relate. This contains no sync pulses,. /----100%

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and OTHOfHTe.ibiioe content of color sync signaling signals, respectively

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. i 100h ,, and t

lIC Lu.

The signal a from the output of detector 1 is fed to the selector 2, which separates the full siihrosignal and its individual component frequencies of lines and fields, and further to the fixation pulse shaper 3. At the outputs of the latter, pulses are generated (see Fig. 2), location which corresponds to the transmission of the vertices of the horizontal sync pulses, and the pulses 3 that coincide in time with the horizontal quenching i-mul-maedi.

With the P01M view, the PSTL communication, located in the fnder of the transmitter of the audio signal sp) po: leader, the high-frequency signal is fed through the input II to the detector of the carrier of the sigals of the sound co-leader 4. At the output of this child, who if there is a constant if / nz, the square of which is proportionally passing power (T) and the transmitter of the signal of your vehicle.

From the output 31 of the first channel of the measuring demodulator of the transmitting station, the dipole is fed through input III to the d-ism of the snoater o, which makes the signal of the beetle with; and iKOTOiporo is normal to the maximum frequency deviation of the carrier A / 3M i: "- Next The signal is sent to the peak detector 6, and the output of which forms a constant forward fault, a signal transmitter and a signal carrier frequency deviation; d5 sound accompaniment.

The signals from the outputs in 1deodete: Ktar 1 ,. of the detector carrier cn11alO | z.vukavogo sonrovodedey and 4 AND 1IM-KOVOGO detector 6 through a non-switch 7, controlled (M 8 program, follow.

HM pulse modulator input 9.

In the case of iponeren.1N output parameters before the signaling signal to the input of an impulse modulator from the output of the video detector galvanic: iodine independent (see

. 2). The operation of the modulator is realized by a sipnal1mn and from the output of the generator 10 strobing chunks launched by the impulse set (see fng. 2). Location and pulses, and in time.

corresponds to the transmission of the vertex pulses. g. At the output of the modulus of the torus, vndeosignal is formed. H /, p) {) gated pulse ummennMNL l, the top 1 of the | ryh corresponds to zero loss, 1 with (carrier), and the span is proportional to the span of the carrier L-uc at the level of idle synchronization, iB radiated signal. This cnnal is used for dl. nzmerenn nrohod p1-s | 1 power of the transmitting signals is depicted; one .

In addition, the signal to Nodina on the amplifier with automatic adjustment 11, and the output of which the span of mm pulses l is fnksnapnym (Unified ;, - const, pr-inmay for 100% n, pO: 113 water of the Mmereiuie. modulations (/ О, containing-in sy11хр; 11izir1on1lkh n of multiplications (/// co) and signalL01 UIVCTDBOli OINHROPNZATSIN {niiy t jy).

From the amplifier output, the signal is fed to the circuit FI1K-: CATION level SI: PHRONNZ IRUYUSCH | IKH, Mpulsov 12, controllable p.mlulsalgl from the output of M Mrovatal 3. Nominal its original designation, circuit 12 provides an elimination of inrny.ibco:; i l from: All-in-one to, to the slice of wiravl yugzie I1pulses well overlap but the length.; 1 hgr impulses l.

A circuit from the output of circuit 12 is used to measure the depths of people. In addition, through (1) azoinve | rto) 13 n, the second 14 cp: C h is assigned to the scheme f; level 1 x 1 gas 1 xn imulysov 15, switched and unmuled 3 I - the other switch input 14 receives the signal k. From the output of circuit 15, a signal is connected to one of the inputs to the mmutator 16.

Thus, depending on the nozhelep. switch 14 pa indicated by the input of a commutator. There is either a signal from m. (see fig. 2), ln / bo has indicated n, IB of which is the level of gassin of pulses of and p is fixed “corresponding to: h,“ h.riipMM6p, The signal span of the signal m, counted from the fixation level o to the level corresponding to the vertexes of the impulses introduced, is lost by the iiecyuieft range and the level of damping pulses in the radiated M signal. relative luminescence mm mm he ncr o: n from rotating pulses in the “sound of eredatech A. CxciMa (}) KicauiHH levels of synchronizing pulses 12 Comm-i-with KOMiMytaror inputs directly and through the selection of color-synchronous signals 17. At the output of 12 BO3IH circuit, the signal p (ohm fig 2) is detected, the ikOTOipoM has xjiiii level cjiiiihrohrsch nh pulses from Pa3iMax; video signal, cut off coupons and in the signal p from the level Onnhr011iruyu1OSh, their pulses up to the maximum level of the brightness signal, proportional to the depth factor. modulation of the transmitter signal. At the outputs of block 17, gig / color synchronization signals appear (see Fig. 2), which are separated by time and frequency selection methods. The swings of these small and normal are relative to the relative frequency of the signals of color sync in the transmitter's radiation. Thus, if a signal from video detector 1 is input to the input of the pulse modulator 9, depending on the positions of the switch 14 and switch 16, the signals m, i, p, t, or y are produced at the output of the latter. To eliminate the effect of the color subcarrier on the measurement results of the modulation depth factor and the relative content of clock pulses, a switch is inserted into the switch & the corresponding notch filter connected during the measurement of these parameters. The signals m, u, p, t, or y are successively galvanically fed to the input of the limiter 18, the output of which is connected to the counting cell. 19. The counter outputs are connected via the matrix 20 to the control input of the limiter 18. Before starting the measurement, each of the parameters of the counter cell is set by pulses of the program block 8 to a position where the voltage at the matrix output is zero. In this case, the signal passes through the limiter and starts the counter, which leads to the appearance of a stepwise varying voltage at the output of the matrix, which increases until the level of the limit is equal to the span of the corresponding measured signal, counted from the fixation level (or zero level). ). Thus, when a signal limiter is applied to the input of the signal m, a code corresponding to the value Uw is recorded in the counter. On command from block 8 of the program, this code enters a quad 21, the output of which forms a digital code corresponding to the transmitted power of the image signal transmitter at the level of damp pulses. It is displayed on the digital power indicator 22 by a command from the program block. In the case of an input of a limiter of signals n, p, t, or ij, digital codes are written in the counter, corresponding to the values, t, gpn (nil), which, when commanded from the program block, are displayed on the digital indicator of linear values 23 (in percent). When measuring the transmitted power of the sound signal transmitter, a constant voltage and from the output of the detector 4 through the switch 7 is fed to a pulse modulator 9, at the output of which the horizontal frequency pulses are formed. The span of these pulses is proportional to the span of the carrier of the sound signal transmitter L.i3. Further, the signal processing is carried out in the same way as the measurement of the current power of the image signal transmitter. When measuring the maximum frequency deviation of the carrier of the audio signal transmitter and the constant nai lu, the irradiation signal, from the output of the peak detector 6, through the switch 7 is fed to the pulse modulator 9, at the output of which rectangular horizontal pulses are also generated. The pulse width is proportional to the maximum deviation of the carrier frequency of the sound signal transmitter And Zmax. These NM pulses through the switch 14, the leveling circuit of the damping pulses 15, the switch 16 and the limiter 18 arrive at the counter 19, in which the code corresponding to the parameter being measured is recorded. According to the command from program block 8, the generated code is displayed on a digital indicator of linear values 23. Thus, the scheme of the proposed device is greatly simplified by using single-channel signal processing and audio sounding, which, in turn, leads to an increase in measurement accuracy. PROBLEM OF THE INVENTION A device for measuring the output parameters of a non-destructive television station, comprising a carrier signal detector, a sound signal discriminator connected in series and a peak detector, a video detector, to the output of which are connected in series: a selectable pulse selector and a driver fixation pulses, a program block connected to a switch, digital indicators of power and linear quantities, a quad and a counter, and even) 5k is connected to the digital linear value indicator directly, and to the digital power indicator through a quad, characterized in that, in order to improve the accuracy of measurement and extension

functionality, which includes a switch, the inputs of which are with a video detector, a carrier signal detector and a peak detector, a control input connected to the program block, and an output through a series-connected pulse modulator, amplifier and level fixing level synchronizing pulses - to one of the inputs of the switch where the control input of the latching circuit of the level si: nnh: isolating signals and means, and the control input of the multi-layer modulator through the gate form swearing

the pulses are connected to one of the B1 INPUTS

shaper immobilization fixer, second switch, one input of which is soy hoarfrost with

the VMCHj modulator, HMHj output, the other through the phase cutter, with the output of the synchronization level fixing circuit; and the output through the latching emulsion leveling circuit, the control input of which is connected to another output of the latching pulse generator, to one of the switch inputs, OLO.K, the color synchronization signal selection, the input of which is connected to the output of the sync signal level fixing circuit, and outputs - to the switch inputs of the matrix, connected to the outputs of the counter and the limiter, the inputs of which are connected to the outputs of the matrix and the switch, and the output is connected to the input of the counter.

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