SU402159A1 - DEVICE FOR SIGNAL TRANSFORMATION - Google Patents

Description

one

Devices are known for converting signals in telemetric measuring systems with PWM or VIM to AIM with time division channels and the presence of overhead signals of minimum and maximum amplitudes. In these devices, the signals are converted using sawtooth voltage generators with an adjustable slope. In this way, the slope of the sawtooth voltage is kept constant on the weight of the frame time on the n channels and adjusted by the voltage from the memory element received during the previous frame by comparing the 100% service pulse with the reference voltage.

The sawtooth voltage pulses from the generator output commute according to the accessories and are memorized. From the voltages of the working channels, the voltage of the service channel is 0% and the voltage difference, directly proportional to the measured parameters, is subtracted, fed to the recorders.

However, in known devices, the possibility of errors associated with distortions of transmitted pulses in the transmission path, especially in the path with the properties of long lines, is not excluded.

The purpose of the invention is to improve the accuracy of the conversion. It is achieved by the fact that

The proposed device is connected to the source of the voltage by one pole to the input of the cascade and compared to the output of the service channel of the minimum amplitude.

The drawing shows a block diagram of the proposed device.

The device contains a clock generator, a driver of informational working and service pulses 2. Counter 3 with 4-G keys forms a channel switch.

Keys 4 and 5 refer to service channels 100% and 0%, respectively, keys 6 to working channels. Shaper 2 is connected to a controlled generator of a sawtooth voltage 7, the output of which is connected to storage accumulators 8, amplifiers 9, recorders 10, reference voltage source AND and a comparison cascade 12 via switches 4-6. The latter is connected through memory element 13 to generator 7.

The device receives a PWM signal with time division channels. In the case of a VIM signal, the latter is predominantly converted into a PWM signal by known methods. The signals from the imaging unit 2 switch the counter 3 with the arrival of the next iformatsionny impulse, and the signals from the imaging device 1 additionally synchronize it across the frame. The information pulses from the imaging unit 2 are also fed to the controlled sawtooth voltage generator 7. The sawtooth voltage pulses with an amplitude proportional to the duration of the corresponding information pulses, from the output of the generator 7, are separated by keys 4-6. Through the keys 5 and 6, they knock on the accumulators 8, each of which produces a constant voltage proportional to the amplitude of the corresponding sawtooth voltage pulses of this channel, and the output voltage of the key 5 produces a constant voltage of the service channel 0%.

Each of the recorders 10 through the amplifiers 9 is connected to the same zeroes of the accumulator of its channel and the channel 0%. This ensures the registration of a differential voltage proportional to the value of the corresponding parameter.

The impulses of the sawtooth voltage of the service channel are 100% through the switch 4 and the amplifier 9 are fed to the input of the comparison stage 12, the second input of which contains the total voltage from the source of the reference voltage 11 and the amplifier of the service channel 0%.

The result of the comparison in the form of a voltage (current) pulse is fed to the element 13 and 13 associated with the generator, which ensures that the sawtooth voltage is steep for the entire frame until the next service pulse reaches 100%.

The described connection of the source of the reference voltage and the links mentioned above provide for an exact correspondence of the difference in the voltage levels of 100% and 0% to the reference voltage. This correspondence is maintained even with distortions of pulses in the transmission path,

leading to shortening (lengthening) of pulses on the device's input by an amount the same for all pulses of the frame (distortion of edges). Interval interval stability

100-0% provides linear and accurate conversion of the signal duration scale to the voltage level.

Subject invention

A device for converting signals in telemetric systems with PWM or VIM to AIM with time division channels and the presence of service signals of minimum and maximum amplitude, containing drivers of information (working and service) pulses and sync pulses connected to the counter inputs

which, together with the keys, forms a channel switch, and the information pulse generator is connected to a niloover voltage generator, the output of which is connected through the keys in series with the accumulators, amplifiers and recorders included in each channel, the reference source and the comparison cascade, connected through a memory element to a saw-tooth voltage generator, characterized in that, in order to increase the conversion accuracy, the reference voltage source is connected from one pole to in comparison stage, and the other - to the output of the service channel minimum amplitude.

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