RU2090009C1 - Device for shaping programmed test signals and teletext pages - Google Patents

Abstract

FIELD: television engineering; measurement of additional information analog and digital signals; checking decoders of teletext transmitted as part of TV signal. SUBSTANCE: device shapes test signals enabling estimation of true transmission of additional digital information, compatibility of additional digital information of teletext type with audio signal when they are transmitted simultaneously, measurement of close and distant repetitive signals in image channel. Test signals shaped in device are used for visual estimation of serviceability of teletext decoder and through channel for additional information digital signal transmission. Device functions both when full color TV signal is present and when there is broadcasting television radio signal. EFFECT: enlarged functional capabilities. 5 dwg

Description

 The invention relates to the technique of television and can be used to measure the parameters of analog and digital signals of additional information, for example, teletext transmitted as part of a television (TV) signal, and the corresponding channels from the transmission, including the sound channel, as well as the control of the operation of TV teletext decoders receivers.

 A known method of introducing measuring signals into the interval of quenching field pulses ([1] p. 434). This method is designed to control and measure the transmission path parameters of only the analog image signal.

 Closest to the method of generating this signal is the test line signal, which is designed to control image channels and sound ([1] p. 483). This signal does not allow to evaluate the influence of teletext signals on the transmission of a sound signal.

 However, these methods did not allow for the measurement and control of the parameters of digital signals of additional information-teletext transmitted as part of the TV signal and its transmission channel, as well as a number of specific parameters of the image channel and sound.

 A device is known for generating television test signals, comprising a matching unit, a synchronization generator, an identification signal generator, an interval distributor, the second input of which is connected to a second output of a synchronization generator, a measuring signal elements generator, a measuring signal generator, the second input of which is connected to a third output of a synchronization generator, and output through an attenuator with an adder, another input of which through a series-connected hash level lock The cross-section and the cross-out circuit is connected to the fourth output of the sync generator, the second input of the quenching level lock connected to the second output of the matching unit. The output of the adder through the matching unit is connected to the output of the generator. However, this device does not provide measurement and control of the parameters of digital signals of additional teletext information transmitted to the TV signal and its transmission channel, as well as a number of specific parameters of the image channel and sound.

 The closest in technical essence to the proposed device is a device for generating test signals, containing a clock pulse selector, serially connected to a pseudo-random sequence (PSP) generating unit, an OR circuit, to the second input of which is connected the output of the test page forming unit, the input of which is connected to the output of the generator clock pulses, code filter driver, introduction unit, the second input of which is connected to the second output of the said selector clock pulses, the third to the input of the device, and its output is the output of the device. However, a disadvantage of the known device is the inability to measure and control the parameters of the analog image channel and sound when transmitting digital teletext signals in the TV.

The aim of the proposed method and device is the formation of programmable test signals and pages and their introduction into the full color television signal (PCTS), into the radio image signal and into the radio signal of broadcast television (RSVT),
For this purpose, the proposed device generates: 1) a pseudo-random sequence (PSP) of pulses in the lines of the quenching pulses of the fields of the PCTS;
2) SRP pulses in the active part of the lines of the TV raster (in all lines of the raster or with a skip of 3 lines);
3) the deterministic signal in the active part of the lines of the TV raster;
4) test pages in strings of damping pulses of PTsTS fields.

This goal is achieved by the fact that
1. In a method for generating programmable test signals and teletext pages with their subsequent introduction into a full color television signal, which consists in generating a test signal with its subsequent introduction into a full color television signal, a deterministic signal having the structure of a teletext signal and containing bit and byte synchronization and code combination of single pulses (bit) "0" and "1";
2. In the method according to claim 1, for measuring and controlling near and far repeats in the image channel, a deterministic signal is introduced into a broadcast television broadcast signal (RSVT);
3. In the method according to claim 1, to evaluate the compatibility of teletext signal transmission with the sound signal, an SRP pulse is generated with a 3-line skip, which is input both into a full color television signal (PTsTS) and into a broadcast television signal (RSVT);
4. In the method of claim 1, for monitoring and measuring parameters of a collective television reception system and TV receivers with a teletext decoder, programmable test signals and teletext pages are input into the broadcast television radio signal;
5. In the device for implementing the method according to claim 1, comprising a clock selector 1, the input of which is the first input of the device and the input of the full color television signal (PCTS), connected in series to the pseudorandom sequence (PSP) generation unit of pulses 3, OR circuit 7, the second input of which the output of the test page forming unit 11 is connected, the code filter former 8, the input unit 9, the second input of which is connected to the input of the clock selector 1, the output of the introduction unit 9 is the first the output of the device for generating programmable test signals and teletext pages, a clock pulse generator 4, a control unit 2, an address counter 5, a read-only memory (ROM) of a determinate signal 6, a modulator 12 and a radio channel 10 are introduced, and to the first, second and third inputs of the control unit 2 the corresponding outputs of the clock selector 1 are connected, the fourth output of the control unit 2 is connected to the address counter 5, which is connected by the first input to the output of the clock generator 4, the output d address counter 5 is connected to the signal inputs of the ROM of the deterministic signal 6, the block of formation of the SRP pulses 3 and the block forming the test pages 11, the control input of the ROM is connected to the first output of the control unit 2, the second output of which is connected to the control input of the block forming the SRP 3, and the third the output of the control unit 2 is connected to the control input of the block forming the test pages 11, the input of the radio channel 10 is the second input of the device and the input of the radio signal of broadcast television (RSVT), one of the outputs the radio channel 10 is connected through a switch 13 to the first input of the device; another output through a switch 14 to the second input of the modulator 12, the first input of the modulator 12 is connected to the output of the input unit 9, the output of the modulator 12 is the second output of the device;
6. In the device according to claim 5, the control unit 2 contains a standby multivibrator 15, the input of which is connected to the first input of the control unit 2, and the output with the first input of the first circuit "And" 16, the second input of the first circuit "And" 16 is connected to the second input control unit 2, the third input of the first circuit "And" 16 is connected to the third input of the control unit 2, the output of the first circuit "And" 16 is connected to the installation input of the pulse counter 17, the counting input of which is connected to the second input of the control unit 2, the outputs of the pulse counter 17 connected to the corresponding decoder inputs Ora 18, the first and second outputs of the decoder 18 are connected to the first and second inputs of the first adder 19, and the third and fourth outputs of the decoder 18 are connected respectively to the first and second input of the switch 21, to the control inputs of which the contacts of the 23 "Raster / 1/4 switch are connected Raster / Off ", the first output of the decoder 18 is connected to the first input of the second adder 22, the second output of the decoder 18 is the third output of the control unit 2, the output of the switch 21 is connected to the third input of the first adder 19, and also through the contacts of the driver 24 "ПСП / ДС" to the first output of the control unit 2, or to the second input of the second adder 22, the output of which is the second output of the control unit 2, the output of the first adder 19 is connected to the first input of the second circuit "And" 20, the second input of which is connected with the third input of the first circuit "And" 16 and the third input of the control unit 2, the output of the second circuit "And" 20 is the fourth output of the control unit 2.

 These features of the proposal are their differences from the prototype. These differences are significant, because they provide the creation of a positive effect, reflected in the purpose of the proposal and are absent in the known technical solutions.

 PSP pulses, which are all kinds of combinations of a digital sequence, are designed to measure and control the fidelity of transmitting digital additional information. To increase the speed of automatic measurements of the fidelity of transmitting digital additional information and the convenience of visual measurements and monitoring the eye diagram, it is advisable to use the bandwidth of pulses introduced into all lines of the raster. To assess the compatibility of the simultaneous transmission of digital additional information such as teletext with a sound signal, it is advisable to use the bandwidth of the pulses introduced into the TV raster with a skip of 3 lines. In this case, the spectrum of digital additional information signals contains harmonic components that have the most intense interfering effect in the frequency band of the audio signal.

The deterministic signal has the structure of a teletext signal and contains: bit, byte synchronization and a sequence of bits, which are a code combination of single pulses (bits) of "0" and "1" generated in the corresponding sequence shown in FIG. 5. The deterministic signal is intended:
1. to measure and control near and far repeats in the image channel, for which I and II groups of pulses of the code sequence are used, respectively (Fig. 5);
2. to measure and control the parameters of digital signals of additional information (level "0", level "1", the amplitude of the digital signal, the parameters of the eye diagram).

 Test pages are designed to visually evaluate the operation of the teletext decoder and the pass-through channel for transmitting a digital signal of additional information (from the input of the encoder to the output of the decoder).

 The introduction of programmable test signals into the radio signal image allows you to control and measure the parameters of the system of collective television reception and TV receivers with built-in teletext decoder.

 The signals of the test pages and the SRP pulses are constantly formed in the lines of the quenching field pulses, and the formation of the SRP pulses or the determinate signal in the active part of the lines is carried out using the "Raster / 1/4 Raster / Off" switch of the control unit 2.

 The introduction of the blocks indicated in the characterizing part of the claims allows the formation of programmable test signals and pages and their introduction into the PTsTs, into the radio signal of the image and into the radio signal of broadcast television and determines the novelty, allows you to automatically set the program for the formation of various test signals and pages of teletext and generate time intervals of lines for their input.

 In FIG. 1 is a functional block diagram of a device for generating test signals and teletext pages; in FIG. 2 is a functional block diagram of a control unit; in FIG. 3 diagrams of time diagrams at characteristic points of the control unit; in FIG. 4 diagrams explaining the operation of the device under various modes of generating test signals and pages; in FIG. 5 deterministic signal.

 The device for generating test signals and teletext pages (Fig. 1) contains a clock selector 1, a control unit 2, a memory bandwidth generation unit 3, a clock pulse generator 4, an address counter 5, a deterministic signal ROM 6, an "OR" 7 circuit, a code filter generator 8, an introduction unit 9, a radio channel 10, a switch 13 and 14, a test page forming unit 11, a modulator 12.

 In this case, the first input of the device is connected to the input of the clock selector 1, and its outputs are to the inputs of the control unit 2. The control inputs of the block of formation of the SRP pulses 3, the ROM of the deterministic signal 6 and the block of forming the test pages 11 are connected to the 2, 1 and 3 outputs of the control unit 2, respectively, and the signal inputs of the said blocks to the outputs of the address counter 5, the first input of the address counter 5 is connected to the output of the clock generator 4, and the second to the fourth output of the control unit 2. The outputs of the forming unit SP 3, the ROM of the deterministic signal 6 and the block forming the test pages 11 are connected to 1, 3 and 2 inputs of the OR circuit 7, respectively, its output is to the input of the filter driver code 8. The output of the filter 8 is connected to the first input of the input unit 9, and the second input the introduction unit 9 with the input of the clock selector 1. The output of the introduction unit 9 is the first output of the device and is connected to the input of the modulator 12, the output of which is the second output of the device. One of the outputs of the radio channel 10, the other output of which is connected through the switch 13 to the first input of the device, is connected to the second input of the modulator 12 through a switch 14. The input of the radio channel 10 is the second input of the device.

 A number of blocks presented on the functional block diagram (Fig. 1) are known from literary sources (see table. 1).

 In the table. 1 is a list of blocks and a bibliography of literature with a specific indication of the execution scheme of the corresponding block indicated in FIG. one.

The device for generating test signals and teletext pages generates the following signals:
1. a pseudo-random sequence (PSP) of pulses in the interval of one or more lines of quenching field pulses;
2. Pulse bandwidth in the active part of the lines of the TV raster (in all lines of the raster or with a skip of 3 lines, i.e. in every fourth line of the raster);
3. deterministic signal in the active part of the TV raster lines;
4. test pages in the interval of one or several lines of quenching field pulses.

 Moreover, the signals of the test pages and the SRP pulses are constantly formed in the lines of the quenching field pulses, and the formation of the SRP pulses or deterministic signal in the active part of the lines is carried out using the switch 23 "Raster / 1/4 Raster / Off" (see Fig. 2), located in control unit 2.

 The device for generating test signals and pages (Fig. 1) works either in the presence of a PCTS supplied to input 1 of the device, or in the presence of a radio signal of broadcast television (RSVT) supplied to input 2 of the device. Moreover, in the presence of PCTS at input 1, the switches 13 and 14 are in the open state (i.e., the radio channel 10 is disabled), and in the presence of PCBT at input 2, the switches 13 and 14 are in the closed state.

 The device has two outputs. If there is a PTsTS input at input 1 of the device, a PTsTS is generated at the first output of the device with programmable test signals and pages introduced into its composition, and at the second output, an image radio signal with the same signals entered into it (switches 13 and 14 are open). If there are 2 RSVT devices at the input (switches 13 and 14 are closed), there is no PCTS at the input, the PCTS with the programmable test signals and pages entered into its structure is also formed at the first output, and the RSVT is formed in the meter and decimeter at the second ranges with programmable test signals and pages introduced.

If there is a PTsTS at the input 1 of the device, it works as follows (switches 13 and 14 are open). The input of the clock selector 1 is connected to the input 1 of the device. At the output of the clock selector 1, sync pulses (Fig. 3a, b), line frequency pulses (Fig. 3d, g) and field frequency pulses (Fig. 3c) are distinguished. These pulses are fed to the first, second and third inputs of the control unit 2, in which control pulses are formed, which are:
1. time intervals occupied by lines in the interval of the quenching pulses of the fields into which the SRP pulses are introduced (Fig. 4b);
2. the time intervals occupied by lines in the interval of the quenching pulses of the fields into which the signal of the test pages is input (Fig. 4c);
3. the time intervals occupied by every fourth row in the active part of the TV raster (Fig. 4d);
4. the time interval occupied by the lines of the TV raster (Fig. 4e);
5. impulses for setting the address counter 5 (Fig. 1).

 To the counting input of the address counter 5, clock pulses are supplied from the output of the clock pulse generator 4. The address counter 5 generates an address code. In the block of formation of the SRP pulses 3 recorded SRP pulses in the teletext format, in the ROM of the determinate signal 6 recorded a sequence of deterministic pulses (Fig. 5), in the block formation of the test pages 11 code sequence of pulses corresponding to the text or graphic information of the test pages.

 When forming the SRP pulses in the line of the interval of quenching field pulses, the control pulse (Fig. 4b), corresponding to the time interval occupied by the line into which the SRP pulses should be entered, are fed from the second output of the control unit 2 to the control input of the SRP pulses forming unit 3. When this impulses installation of the address counter 5 (Fig. 1) from the fourth output of the control unit 2 are fed to the installation input of the address counter 5. At the time of the installation pulse, the address counter 5 begins to form oic address sequence during the time interval corresponding control pulse. From the output of the address counter 5, the code sequence of addresses is supplied to the signal input of the PSP pulse generating unit 3. When the control pulses coincide in time with the code sequence of addresses from the PSP pulse generating unit 3, the recorded pulses begin to be read corresponding to the PSP pulses in teletext format. The read pulses are fed to the first input of the OR circuit 7, and from its output to the input of the filter driver of code 8, in which the front and slice of the pulses of the corresponding test signals are converted in accordance with a given law (for example, a cosine-squared law).

 The converted test signal is fed to the first input of the introduction unit 9, to the second input of which the PCTS is supplied. Thus, the introduction of PSP pulses in PCTS. From the output of the introduction unit 9, the signal is supplied to the first output of the device and to the input of the modulator 12, which provides modulation of the image carrier in the meter and decimeter ranges, respectively. Thus formed the total (decimeter and meter ranges) radio image signal from the output of the modulator 12 is fed to the second output of the device.

 When the SRP pulses are introduced into several lines in the interval of field quenching pulses, the control pulses generated at the second output of control unit 2 correspond to the time intervals occupied by these lines.

 The signal generation of test pages in the line of the interval of quenching field pulses occurs in a similar way. In this case, the control pulse (Fig.4c), corresponding to the time interval occupied by the line into which this signal should be input, is supplied from the third output of the control unit 2 to the control input of the test page forming unit 11, and a code sequence of addresses to its signal input formed in the address counter 5. At this moment, the recorded pulses from the block forming the test pages 11 corresponding to the text or graphic information that are fed to the second input begin to be read OR circuits 7. Next, the formation processes are identical to those that were described during the formation of the SRP pulses.

 When you enter the signal of the test pages in several lines in the interval of the quenching field pulses, the control pulses generated at the third output of the control unit 2 correspond to the time intervals occupied by these lines. Moreover, regardless of whether the SRP pulses and the signal of the test pages are entered in one or several lines, the control pulses allocated at the second and third outputs of the control unit 2 should not coincide in time.

 The processes of formation of PSP pulses in the active part of the lines of a TV raster occur in a similar way, with the exception of the formation of a control pulse.

 In the mode of formation of the SRP pulses in the active part of the TV raster with a skip of 3 lines (in this case, the control pulse (Fig. 4f) generated at the second output of the control unit 2 is fed to the control input of the block in the lines of the blanking pulse of the fields of the SRP pulses formation of SRP pulses 3.

 In the mode of generating the PSP pulses in all lines of the TV raster (in this case, the control pulse (Fig. 4i) generated at the second output of the control unit 2 is also fed into the lines of the blanking pulse of the fields of the PSP pulses 3.

 The formation of a deterministic signal is carried out only in the active part of the lines of the TV raster (in all lines of the raster) and occurs in a similar way. In the mode of generating a deterministic signal on all lines of the TV raster, a control pulse (Fig. 4i) generated at the first output of control unit 2 is fed to the control input of the ROM of the determined signal 6, and a code sequence of addresses generated in the address counter 5 is fed to its signal input At this moment, the recorded pulses begin to be read from the ROM of the deterministic signal 6, corresponding to the sequence of deterministic pulses (Fig. 5), which are fed to the third input of the OR circuit 7. Next, the processes of forming The values are identical to those that were described during the formation of the SRP pulses.

 In the presence of RSVT at input 2 of the device, it works as follows (switches 13 and 14 are closed). In this case, the input of the radio channel 10 receives RSVT. Radio channel 10 allows you to receive RSVT on one of the TV channels. At the first output of radio channel 10, the PTsTS is allocated, which through the closed contacts of the switch 13 is fed to the input of the clock selector 1. Further signal generation processes are similar to those that were described when there was a PTsTs at input 1 of the device. And, therefore, at the input 1 of the modulator 12 is formed PCTS with the test signals and pages introduced into its composition. In this operating mode, sound output signals are emitted at the output of radio channel 10, which are supplied through input 2 of the switch 14 to input 2 of the modulator 12. At the same time, the output of the modulator 12, which is also the second output of the device, generates the total radio signal of the image and sound meter decimeter range with test signals and pages inserted into it.

 In FIG. 2 is a functional diagram of a control unit 2.

 The control unit contains a standby multivibrator 15, a first "And" circuit 16, a pulse counter 17, a decoder 18, a first adder 19, a second "I" circuit 20, a switch 21, a second adder 22, a Raster switch 2/4 Raster / Off ", switch 24" PSP / DS ".

 The first input of the control unit 2 is connected to the output of the clock selector (Fig. 1), from which field frequency pulses are applied to this input.

 The output of the multivibrator 15 (Fig. 2) is connected to the first input of the first circuit "And" 16 (Fig. 2), its second input is connected to the second input of the control unit 2, which receives the frequency pulses from the output of the clock selector (Fig. 1) and the third input of the first circuit "And" 16 (Fig. 2) is connected to the third input of the control unit 2, which receives the signal of the mixture from the output of the clock selector 1 (Fig. 1). The output of the first circuit "And" 16 (Fig. 2) is connected to the installation input of the pulse counter 17, the counting input of which is connected to the second input of the control unit 2. The outputs of the pulse counter 17 are connected to the corresponding inputs of the decoder 18, the first and second outputs of which are connected respectively to the first and second inputs of the first adder 19, and the third and fourth outputs of the decoder 18 to the first and second inputs of the switch 21, to the control inputs of which the contacts of the switch 23 "Raster" 1/4 Raster / Off "are connected. The first output of the decoder 18 is connected nen with the first input of the second adder 22, and the second output of the decoder 18 is the third output of the control unit 2 (Fig. 1). The output of the switch 21 is connected to the third input of the first adder 19 and through the switch 24 "PSP / DS" to the first output of the control unit 2 The output of the first adder 19 is connected to the first input of the second And circuit 20, and its second input is connected to the third input of the first And circuit 16 to the third input of the control unit 2. The output of the second And circuit 20 is the fourth output of the control unit 2 . The output of the switch 21 through the switch 24 "PSP / DS" connected to the second input of the second adder 22, the output of which is the second output of the control unit 2 (Fig. one).

The control unit 2 generates control pulses, which are:
1. time intervals occupied by lines in the interval of the quenching pulses of the fields into which the SRP pulses are introduced (Fig. 4b);
2. the time intervals occupied by lines in the interval of the quenching pulses of the fields into which the signal of the test pages is input (Fig. 4c);
3. the time intervals occupied by every fourth row in the active part of the TV raster (Fig. 4d);
4. the time interval occupied by the lines of the TV raster (Fig. 4e);
5. impulses for setting the address counter 5.

 The control pulses are allocated at the first, second and third outputs of the control unit 2, and at its fourth output, the pulse setting of the address counter 5 (Fig. 1).

 The operation of the control unit 2 is controlled by a switch 23 "Raster" 1/4 of the Raster "Off" and switch 24 "PSP / DS" (Fig. 2). The control pulses generated for the introduction of the SRP pulses and the signal of the test pages in the interval of the quenching field pulses are allocated at the second and third outputs of the control unit 2, regardless of the position of the switch 23 "Raster" 1/4 Raster / Off "and switch 24" PSP / DS " .

 The control pulses generated to introduce the SRP pulses into the active part of the raster lines are also allocated at the second output of the control unit 2, and for the introduction of a deterministic signal at its first output. When the SRP pulses or a determinate signal are introduced into the active part of the lines of the TV raster, the duration of the control pulses changes depending on the mode of introduction of these test signals: into all lines of the TV raster (switch 23 in the "Raster" position) or with a skip of 3 lines (switch 23 in the "1/4 Raster" position). If switch 23 is in the off position, test signals are not input to the active part of the TV raster.

 The introduction of the SRP pulses or a determinate signal in the active part of the lines of the TV raster is controlled by the switch 23 "Raster / 1/4 Raster / Off" and the switch 24 "SRP / DS".

 The control unit 2 operates as follows (Fig. 2).

The pulses of the fields (Fig. 3c) are fed to the input of the multivibrator 15 from the output of the sync pulse selector 1 (Fig. 1), to the input of which the PCTS signal is received from the input of the device. The duration of the pulse generated at the output of the multivibrator 15 (Fig. 2) is equal to half the length of the string (H / 2) (Fig. 3d). This pulse is fed to the first input of the first circuit "And" 16, to its second input
pulses of the frequency of the lines (Fig. 3d, g), and to the third input pulses of the sync mixture (Fig. 3A, b). At the input of the first "And" circuit 16, one pulse is allocated (Fig. 3e) during the transmission of one frame (for example, in 1 field). This pulse in each frame is the installation of the pulse counter 17, the counting input of which receives the pulse frequency of the lines. The pulses from the output of the pulse counter 17 are supplied to the corresponding inputs of the decoder 18.

 The operation of control unit 2 is shown in the following example.

 In FIG. 4a shows two adjacent lines in the interval of quenching field pulses, into one of which the SRP pulses are entered, and into the other signal of the test page, as well as the lines of the TV raster, into which the SRP pulses are entered in the mode of skipping 3 lines.

 The control pulses are formed at the first and second outputs of the decoder 18, representing the time intervals occupied by the lines in the interval of the quenching field pulses, into which the SRP pulses (Fig. 4b) and the signal of the test pages (Fig. 4c) are introduced, and at the third and fourth outputs time intervals occupied by every fourth line of the TV raster (Fig. 4d) and lines of the TV raster (Fig. 4e), respectively.

If the switch 23 "Raster / 1/4 Raster / Off" is in the "Off" position, then no test signals are entered into the active part of the TV raster, only signals are entered into the intervals of the quenching field pulses (Fig. 4a ₁ ). In this case, there are no pulses at the output of the switch 21 (Fig. 2), and pulses from the first and second outputs of the decoder 18 are supplied to the first and second inputs of the adder 19. A control pulse corresponding to the time interval occupied by the line for introducing the test page signal into the blanking interval field pulses (Fig. 4c), from the second output of the decoder 18 (Fig. 2) is fed to the third output of the control unit 2 (Fig. 1). The control pulse corresponding to the time interval occupied by the line for introducing the SRP pulses into the interval of quenching field pulses (Fig. 4b), from the first output of the decoder 18 is supplied to the first input of the second adder 22, and from its output to the second output of the control unit 2.

From the output of the first adder 19, a pulse (Fig. 4e ₁ ) is supplied to the first input of the second circuit "I" 20, and to its second input pulses of the clock from the third input of the control unit 2 (Fig. 4g). At the same time, pulses are allocated at the output of the second "And" 20 circuit (Fig. 4c ₁ ). These pulses carry out the installation of the address counter 5 (Fig. 1) and enter the fourth output of the control unit 2.

 The control unit 2 provides for the formation of control pulses for the simultaneous introduction of the signal of the test pages in several lines in the interval of the quenching field pulses and the introduction of SRP pulses also in several lines. In the first case, control pulses corresponding to several lines into which the test page signal is input are generated at the second output of decoder 18, and in the second case, control pulses corresponding to several lines into which SRP pulses are input are generated at the first output of decoder 18.

 In the mode of introducing PSP pulses into the active part of the TV raster with 3 lines skipping, switch 23 "Raster / 1/4 Raster / Off" is set to "1/4 Raster", and switch 24 "PSP / DS" to "PSP "(regardless of the position of switch 23 and 24, test signals in the interval of field quenching pulses are also entered). At the third output of the control unit 2, control pulses are generated (Fig. 4c), as described above. At the output of the switch 21, to the first and second outputs of which the third and fourth outputs of the decoder 18 are connected, respectively, control pulses are formed corresponding to the time intervals occupied by each fourth line of the TV raster (Fig. 4d), these pulses are fed to the third input of the first adder 19, and control pulses from its first (Fig. 4b) and second (Fig. 4c) outputs of the decoder 18 are supplied to its first and second inputs.

 From the output of the first adder 19, the pulses (Fig. 4e) are fed to the first input of the second circuit "I" 20, and the pulses of the clock mixture (Fig. 4g) are fed to its second input. At the same time, pulses are allocated at the output of the second “I” circuit (FIG. 4h), which install the address counter 5 (FIG. 1) in this operating mode. These pulses are fed to the fourth output of the control unit 2. From the output of the switch 21, the control pulses (Fig. 4d) through the contacts of the switch 24 "PSP / DS" are fed to the second input of the second adder 22, the first input of which is supplied with pulses (Fig. 4b), and from its output pulses (Fig. 4L) to the second output of the control unit 2.

 In the mode of introducing the SRP pulses in the lines of the TV raster, the switch 23 "Raster / 1/4 Raster / Off" is set to the position "Raster", the switch 24 "PSP / DS" to the position "PSP". (Test signals in the interval of quenching field pulses are also introduced). At the output of the switch 21, a control pulse is generated corresponding to the time interval occupied by the raster lines (Fig. 4e), which is fed to the third input of the first adder 19 (Fig. 2), and to its first and second inputs as well as in the previous mode - pulses (Fig. 4b) and (Fig. 4c) from the outputs of the decoder 18. From the output of the first adder 19, the pulses (Fig. 4i) are fed to the first input of the second circuit "And" 20, and the second input pulses of the clock (Fig. 4g) . At the same time, pulses are allocated at the output of the second AND circuit 20 (Fig. 4k), which in this operating mode set the address counter 5 (Fig. 1). The control pulses (Fig. 4e) through the switch 24 "PSP / DS" are fed to the second input of the second adder 22, and to its first input pulses (Fig. 4b). From the output of the second adder 22 pulses (Fig. 4m) are fed to the second output of the control unit 2.

 In the mode of introducing a determinate signal into the active part of the lines of the TV raster, the switch 23 "Raster / 1/4 Raster / Off" is set to "Raster", and the switch 24 "PSP / DS" in the position "DS". The formation of control pulses and installation impulses of the address counter 5 is carried out in a similar way. In this mode, the control pulses (Fig. 4e) are allocated at the first output of the control unit 2.

 Thus, the method of generating programmable test signals and teletext pages makes it possible to measure and control the parameters of the analog image channel and sound when transmitting digital teletext signals as part of a TV signal.

 The deterministic signal makes it possible to measure and control near and far repeats in the image channel, the parameters of the digital signal of additional information.

 The SRP of pulses introduced into the TV raster with a skip of 3 lines allows you to evaluate the effect of the teletext signal on the transmission of the sound signal.

 Test pages allow you to evaluate the operation of the teletext decoder and the end-to-end digital signal transmission channel for additional information.

 The introduction of programmable test signals into the radio image signal allows you to control and measure the parameters of the collective television reception system.

 From the description of the device it can be seen that the introduction of the control unit allows you to automatically set the program for the formation of various test signals and teletext pages and to form time intervals of lines for their input, the introduction of a deterministic signal ROM allows you to generate a specific signal to control the parameters of the image channels and sound, the introduction of the address counter allows you to highlight information about test signals and teletext pages in accordance with a given program by entering The modulator provides amplitude modulation of two carrier images of both the meter and decimeter ranges with a full color TV signal, including digital teletext signals, with parameters and characteristics in accordance with the requirements of the standard [4], the introduction of a radio channel block allows the introduction of programmable test signals and pages into the radio signal broadcast television of any received channel.

Claims (1)

 A device for generating programmable test signals and teletext pages containing a sync pulse selector, the input of which is the first input of the device and the input of the full color television signal, the pseudorandom sequence of pulses forming in series, an OR element connected to the second input of which the output of the video signal generating unit of the teletext pages correcting filter, introduction unit, the second input of which is connected to the input of the clock selector, the output is and the introduction is the first output of the device for generating programmable test signals and teletext pages, a clock pulse generator, characterized in that a control unit, an address counter, a read-only memory of the deterministic signal, a modulator and a radio channel unit are introduced into it, and to the first, second and third inputs the control unit is connected to the corresponding outputs of the clock selector, the fourth output of the control unit is connected to the address counter, which is connected to the first input to the output of the clock pulse generator, the output of the address counter is connected to the signal inputs of the permanent memory of the deterministic signal, the pseudo-random sequence of pulses and the generating unit of the test pages, the control input of the permanent memory is connected to the first input of the control unit, the second output of which is connected to the control input of the forming unit pseudo-random pulse sequence, and the third output to the control input of the block form of the video signal of the teletext pages, the input of the radio channel block is the second input of the device and the input of the broadcast television radio signal, one of the outputs of the radio channel block is connected via a switch to the first input of the device, the other output is through a switch with the second input of the modulator, the first input of the modulator is connected to the output of the input block, the output modulator is the second input of the device.

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