SU579647A1 - Receiver of control signals - Google Patents

Description

one

The invention relates to telemechanics and can be applied to remote control radio and television equipment.

A device for receiving control signals is known, which consists of a console and a receiver 1. The receiver contains an amplifier, selective filters, detectors, a decoder, and control objects. The console emits signals with different frequency components for different commands. From the amplifier, the received signals arrive at the selective filters, are detected and fed to the corresponding inputs of the decoder. For each combination of the frequency components in the transmitted signal, the voltage arriving at the control object appears at the coax corresponding to the output of the decoder.

The disadvantages of the system are the complexity of the console's controllers and low noise and the receiver's impulse interference, the spectrum of which partially or completely covers the amplifier's operating frequency range, since the appearance of interference with a frequency w corresponding to the filter settings immediately leads to the appearance of an apron shshifratora.

The closest in technical essence to the proposed invention is a device for receiving control signals comprising an ultrasonic signal converter, the output of which is connected to the first input of a counter through a serially connected amplifier and pulse shaper, the output of the counter is connected to the first the input of the decoder, the synchronizer, the output of which is connected to the second inputs of the frequency divider, the counter and the decoder 2.

However, this device is characterized by low noise immunity from pulsed noise in the range corresponding to the bandwidth of the amplifier, since a single pulse generated at the output of the decoder as a result of the effect of this interference will trigger the Control Object.

The aim of the invention is to improve the noise immunity of the remote control device.

To do this, the device has impulse accumulators, a detector, a key element, valves, threshold elements, And elements, a generator, valve outputs, direct outputs of the remote controller, are connected to the inputs of the threshold elements and corresponding outputs And, the outputs of the elements And are connected with the objects of control. No, the generator output is connected to the second inputs of the elements I, the output of the pulse generator through the detector is connected to the input of a key element whose output is connected to the inputs of the gates. The drawing shows a block diagram of the device. The device contains a transducer 1 ultrasonic signals into electrical, amplifier 2, shaper 3 pulses, divider 4 frequencies, counter 5, decoder 6, synchronizer 7-, drives 8.9 pulses, threshold elements 10,11, elements I 12,13, objects 14 , 15 controls, generator 1b valves 17.18, key element 19, detector 20. The device operates as follows. If a command to the device is not given, then the signal at the output of the pulse shaper 3, and therefore the blocking offset at the output of the detectors 20, is absent. In this case, the key elongation Ment 19 has a high conductivity, as a result of which the voltage at the outputs of the accumulators 8.9 pulses is absent And the pulses from the generator 16 do not flow through the elements 12,13 to the objects 14,15. When a command is received in the form of ultrasonic waves, the transducer 1 is; Gives an electrical signal to the input of amplifier 2, which is amplified to a level that ensures reliable operation of the pulse shaper 3. The latter converts a sinusoidal sigal into a sequence of rectangular pulses of the same frequency, arriving at the 4 frequency divider and the detector 20. The 4 frequency generator during a time equal to half the clock cycle defined by the synchronizer 7 delivers a series of pulses to the counter 5. Since the duration of a clock is equal to twice the period of the supply network (220 V, 50 Hz), the number of pulses arriving at the counter is determined by the frequency of the signal received by the command. As a result, counter 5 will assume the state characterized by the corresponding binary move. At one of the outputs of the decoder appears a periodic sequence of pulses arriving at the accumulator of 8 pulses. At the output of the accumulator 8 pulses, as a result of 18-20 pulses arriving at its input, the output of the decoder 6, the voltage reaches a value equal to the threshold of the threshold element 10. In this case, the key element 19 has a low conductivity, since the locking bias applied to it with fleTektor 20, keeps it in a closed state. The closed key element 19 does not prevent an increase in the voltage at the output of the accumulator 8 pulses. When the threshold element 10 is triggered, the pulses from the generator 16 through the element 12 are transmitted to the control object 14. After the termination of the command, the signal voltage is not input to the detector 20, the locking offset from the key element 19 is removed, its conductivity increases sharply, and the drive 8 pulses are quickly discharged through the key element 19. Thereafter, the output voltage of the drive 8 pulses close to O and the pulses from the generator 16 do not flow through the AND 12 element to the control object 14. Valves 17.18 exclude direct connection between the outputs of the accumulators 8 and 9 pulses. When applying another command to the transducer 1, ultrasonic waves of a different frequency arrive. At the same time, the counter 5 will receive a different number of pulses in a time equal to half the cycle defined by the synchronizer 7, the counter will take a state characterized by a different binary code, and the periodic sequence of pulses will go from the output n of the decoder 6 to the accumulator 9 pulses. Further, the operation of the circuit is similar to the case when a series of pulses arrived at the accumulator 8 pulses, with the exception that the pulses from the generator 16 are sent to the control object 15 through the element 13. When the device operates with a pulse tone, the interference at the frequency corresponding to the passband the amplifier, the pulses from the generator 16 to the objects 14,15 control is not received if the duration of the interference is less than the duration of 18-20 clocks of synchronizer 7 (720-800 ms). In addition, in the case of a pause (in the order of 0.1 ms) in the disturbance, storage drives 8.9 through key element 19 are discharged, which further increases the noise immunity of the remote control receiver. Thus, drives 8.9 im-; pulses, threshold elements 10, 11, elements AND 12, 13, key element 19 and detector 20 exclude the direct passage of pulses from the outputs of the decoder 6 to control objects 14, 15 and transmit pulses to control objects 14, 15 from generator 16 only in effects on the output of the decoder 6 series of 18-20 pulses, which significantly increases the noise immunity of the remote control receiver.

Claims (1)

1. Accepted for France № 2205780, cl. H 03 3 7/02, 1974 2, Accepted for France № 2183504, kb. C 19/28, 1974