RU2066937C1 - Device for control of tv receiver - Google Patents

Abstract

FIELD: TV devices. SUBSTANCE: device has SSC signal generator 1 and decoupling unit 2. Main station part of device has unit 3 which detects synchronization signals, unit 4 which detects control signals, control unit 5, and unit 16 which increases synchronization frequency. Peripheral station part of device has unit 6, which detects synchronization signals, unit 7 which detects control signals, unit 8 which outputs response signal, unit 9 which requests digital and analog sensors, decoding unit 10, registers 11, 13, and 15, digital-to-analog converter 12 and NOR gate 14. Device operates in two modes. In first mode it sends control commands from main station to peripheral one. In second mode it receives one information bit at main station about state of digital or analog unit at peripheral station. Introduced unit 16 which increases synchronization frequency provides possibility to increase information transfer in extreme cases. Other claims of invention describe specific design of unit 16 which increases synchronization frequency and control unit 5. EFFECT: increased speed of information transfer. 3 cl, 4 dwg

Description

 The invention relates to television technology, can be used in television receivers and is an improvement of the known device described in the application N 2046549, 4151717 / 24-09 a positive decision from 12.13.86,

 The aim of the invention is to increase the speed of the device by increasing the amount of transmitted information.

 In FIG. 1 is a structural electrical diagram of a television receiver control device.

 In FIG. 2 and 3 and 4 are timing diagrams illustrating the operation of the device.

 The television receiver control device (Fig. 1) contains an SSC signal generator 1, an isolation unit 2, a synchronization signal isolation unit 3, a control signal allocation unit 4, a control unit 5, at a peripheral station, a synchronization signal allocation unit 6, block 7 at a central station allocation of control signals, block 8 generating a response signal, block 9 polling digital and analog sensors, block 10 decryption, first register 11, block 12 digital-to-analog converters (DAC), register 13 shift, element OR NOT 14, second register 15, in Central station entered block 16 increase the synchronization frequency.

 The synchronization signal extraction unit 3 comprises a first SSC signal detector 17, a first SSC signal recovery unit 18.

 The control signal extraction unit 4 comprises a first comparator 19, a first reference voltage source 20.

 The control unit 5 comprises a first key 21, a microcomputer 22, an IR receiver 23, a keyboard unit 24.

 The synchronization signal extraction unit 6 comprises a second SSC signal recovery unit 25, a second SSC signal detector 26, a first AND element 27.

 The control signal extraction unit 7 comprises a second voltage reference source 28, a second comparator 29, and a trigger 30.

 The response signal generating unit 8 comprises a delay element 31, a second key 32, a second AND element 33.

 Block 9 polling digital and analog sensors contains a block 34 of the comparators, digital-to-analog Converter 35 (DAC), the multiplexer 36.

 Block 16 increases the synchronization frequency contains a second block 37 isolation, the third key 38, the source 39 of the voltage.

 SSC signal recovery blocks 18 and 25 may be implemented as a low-pass filter.

 The control device of the television receiver operates as follows.

 The signal from the output of the SSC signal generator 1 through the first isolation unit 2 and the first SSC signal recovery unit 18 (Figs. 2a and 3a) is input to the first SSC signal detector 17, the signals A, B, C from the output of which (Fig. 2e, d , c and 3d, d, c) are fed to the inputs of the micro-computer 22. The micro-computer 22 is synchronized by signals A, B, C and, in accordance with the program of work and received from the IR receiver 23 and the keyboard block 24, generates pulses ( Fig. 2b and 3b), which the first key 21 in the form of pulses of the control signal are input into the signal SSC. SSC signal recovery blocks 18 and 25 are designed to suppress these pulses before applying the SSC signal to the SSC signal detectors 17 and 26. The SSC signal, with the control pulses introduced (Figs. 2a and 3a), is fed to the second comparator 29, to the gate input of which the signal A is received (Figs. 2e and 3d). As a result of comparing the SSC signal with the level of the second reference voltage source 28 and as a result of gating with signal A, a signal is generated at the first and second outputs of comparator 29 (Fig. 2e, and 3e, and). That is, control pulses located in the active part of the lines in the interval of the frame blanking pulse. The control pulses taken from the first output of the comparator 29 (Figs. 2e and 3e) are set at the S-input of the trigger 30 to the state "log. 1". In the state "log. 0" trigger 30 is returned on the trailing edge of the pulse In (Fig. 2d and 3d), supplied to its C-input. D-input of the trigger 30 is connected to the level of "log. 0". The output signal of the trigger 30 (Figs. 2g and 3g) is fed to the input of the shift register 13, to the synchronization input of which pulses from the output of the element And 27 (Figs. 2z and 3z) are received, when signals A and B coincide. As a result, in the register 13 of the shift after the end of the frame blanking pulse, a parallel code of the received control command is recorded, containing in one part N bits of the address of the actuator and located on the address output of the shift register 13, and in the second part of M bits of data output to the information output of the shift register 13 a. These M data bits are fixed in the actuator at the selected address after the end of the frame blanking pulse. The address of the actuator is decrypted by the decryption unit 10 and fed to the gate inputs of the blocks 11, 12, 15, and 35. The signal from the output of the OR-NOT 14 element, allowing information to pass along the trailing edge of pulse A, is fed to the gate input of the decryption unit 10 (Fig. 2k and 3k) when the operating mode selection bit is in the zero state at the first output of the second register 15. To expand the addressing capabilities of executive devices, the decryption unit 10 has additional inputs. The outputs of the register 11 are intended for switching in the Executive units. The outputs of block 12 DACs are designed to control analog blocks.

 One of the bits of the information output of the shift register 13 is for transmitting a bit for selecting a device operation mode. Setting this category to "log. 1" puts the device in the mode of issuing information from a peripheral station to a central station. This discharge is fixed at the first output of the second register 15 by a gating pulse from the decryption unit 10.

 Information transfer from the peripheral station to the microcomputer 22 is carried out in three stages.

First, the value of the parameter of interest to us is recorded in the DAC 35. In the next frame quenching pulse, a command containing:
second register address 15,
operation mode selection bit in the "log. 1" state,
To bits of data transmitted through the second register 15 to the address inputs of the multiplexer 36.

 Information at the output of register 15 appears on the trailing edge of pulse A. The appearance of “log. 1” at the first output of register 15 allows the passage of information from multiplexer 36 to the second key 32.

 Direct input of information from a peripheral station occurs with the beginning of the next, third, frame blanking pulse.

 The inverse output of the comparator 29 through the delay element 31 gates the passage of information from the output of the multiplexer 36 (Fig. 3l) to the input of the key 32 (Fig. 3n). By the delay element 31, the input signal is delayed by a time exceeding its duration (Figs. 2l and 3m). The trailing edge of this pulse resets to “log. 0” register 15. The second key 32 implements the information in the signal SSC. Thus, each control pulse introduced into the SSC signal by the central station in the mode of transmitting information from the peripheral station leads to the appearance of the second of the same pulse after the first only if there is a level of "log. 1" at the output of the multiplexer 36 (Fig. 3L).

 Let us describe the structure of a command for transmitting information from a peripheral station.

 In the active part of the lines of the blanking pulse (except the first), a pulse is supplied that determines the moment of gating information from the output of the multiplexer 36 (taking into account the delay time of block 31). The first input of the multiplexer 36 receives information from the block 34 of the comparators, the first input of which receives information from the analog blocks of the Executive circuit. The second input of the comparator unit 34 is connected to the output of the DAC 35. Thus, the status information of the analog and digital units can be transmitted to the central station. Using the comparator 19 and the voltage reference source 20, information is extracted for processing it in the microcomputer 22.

The device operates in two modes:
first transmission of control commands from the central station to the peripheral station.

the second receiving one bit of information by the central station about the status of the digital or analog unit of the peripheral station. To do this, pass three commands:
1) write in the DAC 35 the value of the parameter of interest;
2) write in register 15 the address of the comparator in block 34, the second input of which receives the parameter of interest to us;
3) apply a pulse from the central station, gating the comparison in the comparator of the actual value of the parameter with the value recorded in the DAC 35.

 At the time of turning on the television receiver, it is necessary to issue a large amount of information from the ROM to peripheral circuits. In this case, the micro-computer 22 at the second output generates a pulse equal to the pulse width of the personnel blanking (Fig. 4b). At the same time, when the SSC signal generator 1 does not produce such a pulse (Fig. 4a). This pulse is supplied to the control input of the key 38 and switches the output of the voltage source 39 through the isolation unit 37 to the SSC bus. Moreover, due to the presence of blocks 2 and 37, isolation on the SSC signal bus, we obtain a signal (Fig. 4c) with an increased repetition rate of frame blanking pulses, during which information is transmitted as described above. Moreover, for one period of the frame frequency, many cycles of information transfer are carried out.

 For those circuits that use a frame blanking pulse in the process, a clean SSC signal without additional input frame blanking pulses is removed from the fourth output of the television receiver control device.

 For the central station to work together with an external computer (for example, in a manufacturing process), a request pulse is generated in the active part of the first line of the blanking pulse of the external computer, which is analyzed by the micro-computer 22 in the central station. "Log. 1" in the first line transfers control functions from the central station to the external computer.

 Thus, the introduction of a block to increase the synchronization frequency allows you to speed up the exchange of information in extreme conditions.

Claims (3)

 1. The control device of the television receiver, characterized in that, in order to increase the speed of the device by increasing the amount of information transmitted, a synchronization frequency increase unit is introduced into the central station, the input of which is connected to the second output of the control unit, and the output is connected to the input of the synchronization signal extraction unit and the input of the control signal extraction unit.  2. The device according to claim 1, characterized in that the synchronization frequency increase unit is made in the form of series-connected voltage sources, a third key, the control input of which is the input of the synchronization frequency increase unit, and a second isolation unit, the output of which is the output of the synchronization frequency increase unit .  3. The device according to claim 1, characterized in that in the control unit of the central station containing the first key, the output of which is the first output of the control unit, and the input is connected to the first output of the microcomputer, the first and second inputs of which are respectively synchronization inputs and information inputs the control unit, the third and fourth inputs are connected respectively to the outputs of the keyboard unit and IR receiver, the inputs of which are the control inputs of the control unit, the second output of the microcomputer is the second output of the unit equalization.

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