SU960890A1 - Tv signal receiving device - Google Patents

Description

(5) DEVICE FOR RECEIVING TELESIGNALS

1 The invention relates to radio engineering, in particular, to a receiving technique of remote control signals, and can be used in remote control devices of radio, television and other equipment.

Known devices for controlling the receiver, comprising a serially connected pulse generator, a divider, a pulse counter, a memory register and a decoder, the output of the pulse generator through a single vibrator connected to the first input of the pulse train control unit, the second input of which is connected to the source of reference signals via an additional pulse shaper , and the outputs of the pulse train control unit are connected to the control inputs of the divider, pulse counter and for 1D ominayuschego register.

However, in such devices, there is no noise immunity from continuous signals entering the working frequency range of this device. In addition, it cannot be used as a standalone control device for controlling several devices from a single control panel.

The closest technical

10 to the essence of the invention is a device for receiving television signals, comprising a generator, the output of which is connected to the first frequency divider, the output of which is connected to the input

15 of the second frequency divider, the outputs of which are connected to the corresponding inputs of the decoder and the inhibitor pulse shaper and the command shaper of the command, whose input

20 is connected to the input of the device t 2 ..

A disadvantage of the known device is low noise immunity. 336 The aim of the invention is to improve the noise immunity of the device. The goal is achieved by the fact that a device for receiving television signals containing a generator, the output of which is connected to the information input of the first frequency divider, the output of which is connected to the information input of the second frequency divider, the outputs of which are connected to the corresponding inputs of the decoder and the inhibitor pulse generator and the command signal generator, the input of which is connected to the input of the device, the command pulse formating and command decoder are entered, the output of the command signal generator Connected to the first input of the control pulse generator and to the first input of the command decoder, the outputs of which are connected to the outputs of the device, the output of the generator is connected to the second input of the formation of the body of control pulses, the output of which is connected to the control inputs of the first and second frequency dividers, the output of the first divider the frequency is connected to the second input of the command decoder, the first output of which is connected to the third input of the control pulse, the fourth input of which is connected to the driver pulse, FIG. 1 shows a diagram of the device, FIG. 2 and 3 diagram of the device. The device for receiving television signals comprises a generator 1, first and second dividers 2 and 3 frequencies, a decoder k, a suppressor generator 5, a command signal generator 6, a control pulse generator 7 and a command decoder 8. A device for receiving a television signal works as follows. With the presence of a command at the output of the formatter b of the command signal, the generated signal of the received Command appears (Fig. 2a). The signal is an alternating t- clock pulse sequence. (Fig. 2a) and the command pulse t (Fig. 2a), with the duration t-. n-.tft, where n is an integer, and after the clock pulse there is a guard period equal to the duration of the pulse command. The commands differ from each other in time t from the falling edge of the clock pulse to the leading edge of the command pulse. The time T (FIG. 2a) defines the period of one command sequence. At the same time, the duration of the clock and command pulse, as well as the time defining the command and the period of one command sequence, are multiples of the period of the frequency of the transmitter generator signal. The frequencies of the transmitter generator and the generator 1 of the receiver are the same and stabilized. So, the signal (Fig. 2a) from the output of the signal generator of command 6 is fed to one of the inputs of the control pulse generator 7, and the signal from the generator 1 is simultaneously fed to another of the inputs of the driver 7. In the control driver 7, the signal from the generator 1 and si-nal shown in fig. 2a, clock pulse selection. As a result, at the output of the control pulse shaper 7, the switching voltage of dividers 2 and 3 appears (Fig. 26). The voltage (FIG. 26) includes a divider 2 frequencies and a divider 3 frequencies. In this case, at the output of the frequency divider 2, pulses are generated (Fig. 2b), which are fed to the input of the frequency divider 3. In this case, pulses are formed at each of the outputs of frequency divider 3 (Fig. 2d, e, f, g). To simplify the description of the operation, divider 2 is selected as the 3 frequency divider, although generally, depending on the number of commands received, it is divider 2, impulses (Fig. 2d, e, f, g) from the output of divider 3 is fed to the inputs decoder. In general, it is a decoder having n-inputs and 2-outputs. For simplicity, consider a decoder with four inputs and sixteen outputs. When pulses are applied to the decoder input (Fig. 2d, d, e, g), impulses will appear on each of the outputs of the decoder 4, depending on the combination of impulses at the input. This means that at one of the outputs of the decoder a pulse is received (Fig. 2h), coinciding in time with the command pulse t | (Fig. 2a). This pulse (Fig. 2h) is supplied to one of the inputs of the decoder 8 of the command. In addition, pulses (Fig. 2c) are output to its first input from frequency divider 2, and to the second input, a command signal (Fig. 2a) from the output of shaper 6 of the command signal. . As a result of the effect of these three signals, the decoder 8 command, at one of its outputs, and fully defined, which corresponds to the number of the command being received, a working pulse appears (Fig. 2i) used for control. Thus, the device performs the recognition and. command selection. At the end of the command sequence T (Fig. 2a), a combination of pulses (code) is formed at the input of the inhibitor impulse generator 5 (code), at which an impulse - (fig. 2k) appears at its output, which is fed to the input of the impulse control generator 7. When this happens, a voltage is generated at its output (Fig. 26), which closes dividers 2 and 3. The next command sequence will be processed by the device, as described above. In the device, to further increase noise immunity, the signal from one of the outputs of the decoder 8 is fed to one of the inputs of the driver 7 of the control pulses. The output of the decoder 8 is selected so that the pulse on it (Fig. 2l appears with a delay of ut relative to the end of the clock pulse t. (Fig. 2a). This pulse appears only when there is an interference pulse, the duration of which exceeds time. When an impulse impact on a device is interfered with a duration tL.at at time tj- & ut at the output of the control pulse generator 7 appears as during normal operation, the switching voltage of the dividers (Fig. 26), but if the duration of the disturbance pulse is greater than ut then at one of the exits de the encoder of command 8 for the Wits pulse (Fig. 2L), which will result in the output of the voltage control pulse generator (Fig. 26, dotted line), closing the dividers 2 and 3, i.e., false positives of the device are prevented The presence of a connection from one of the outputs of the decoder 8 command to one of the inputs of the driver pulse generator 7 allows you to expand the functionality of the device. In particular, use this device, which is available in each of the devices controlled from one control panel. In this case, the device will work as follows. The received and processed command sequences for different devices differ in the duration of the clock pulse. Moreover, the difference in duration should be greater. For example, we have three command sequences for three different devices. Suppose that the command impulses in them go simultaneously (Fig. 3, a, b, c). The considered devices in these devices are similar in construction to the proposed one and differ from each other only by the response of the driver 7 of control pulses to the selection of the clock pulse, i.e. The drivers 7 of the control pulses of each of the devices respond only to the duration (own) clock pulse. Assume that a command sequence is sent from the transmitter. Control panel (Fig. 36). Then the driver 7 of the control pulses and the device as a whole, for which this command is intended, will work in the same way as the proposed device, the operation of which is described above. At the same time, at the output of the control pulse driver 7 there will be a signal (FIG. 2) and the device will enter the processing mode of this command (FIG. 36). The other two devices will work as follows. A device in which the control pulse shaper 7 is configured to select the clock pulse duration t will work as the proposed device in the mode of receiving interference in the form of a pulse that has a duration longer than the control pulse selector of the device for this unit. At the same time, at the output of the imager 7, Vits voltage (Fig. Zg), i.e. The device for this unit will not enter the processing mode of this command (Fig. 3B). The device for which the control pulse shaper 7 is configured to select the clock duration t + 4d1 also does not enter the processing mode of this command (Fig. 36), since the duration of the clock pulse of the received command 2ut (Fig. 36) is less than that The shaper 7 of the pulses of control of the device of this apparatus react, and therefore at the output of the forwarder of 7, the opening voltage of dividers 2 and 3 is absent (Fig. Ze). Thus, out of three devices placed in three controlled devices, into the command processing mode Only one device of a well-defined apparatus will come in (Fig. 36), for which the command was transmitted (Fig. 36). The proposed device differs from the known ones in that it will allow no to increase noise immunity in case of distortions of the pulse length in the communication channel. . The device for receiving a television signal contains a generator, the output of which is connected to the information input of the first frequency divider, the output of which is connected to the information input of the second frequency divider, the outputs of which are connected to the corresponding inputs of the decoder and the inhibitor pulse former and the driver of the command input which is connected to the input of the device, characterized in that, in order to improve the noise immunity of the device, the driver of control pulses and command encoder, the output of the command signal generator is connected to the first input of the control pulse generator and to the first input of the command decoder, the outputs of which are connected to the device outputs, the generator output is connected to the second input of the control pulse generator, the output of which is connected to the control inputs of the first and second frequency dividers , the output of the first frequency divider is connected to the second input of the command decoder, the first output of which is connected to the third input of the control pulse former, to h The fourth input of which is connected to the prohibitive pulse driver. Sources of information taken into account during the examination 1. USSR author's certificate No. 528895, cl. H 0 V 1/06, 1976. 2. Bilik R.V., Zhozhikashvili V.A., Mityushkin K.G. and Prangishvili I.V. Contactless elements and remote control systems. M., - Science, Teb, p. 32, fig. 10- (prototype).

Claims (1)

The claims of A device for receiving television signals, comprising a generator, the output of which is connected to the information input of the first frequency divider, the output of which _{35 is} connected to the information input of the second frequency divider, the outputs of which are connected to the corresponding inputs of the decoder and shaper. stop pulse and command signal shaper, the input of which is connected to the device input, characterized in that, in order to increase the noise immunity of the device, a control pulse shaper and a command decoder are introduced into it, the output of the command signal shaper is connected to the first input of the control pulse shaper and to the first input command decoder, the outputs of which are connected to the outputs of the device, the output of the generator is connected to the second input of the control pulse shaper, the output of which is connected to the control With the input inputs of the first and second frequency dividers, the output of the first frequency divider is connected to the second input of the command decoder, the first output of which is connected to the third input of the control pulse shaper, to the fourth input of which the inhibit pulse shaper is connected.