SU676974A1 - Correcting device - Google Patents

Description

one

The invention relates to automation and can be applied in control systems to extract and optimally measure a narrowband signal in noise.

Variable bandwidth adjustment devices 1, 2 are known.

Of the known correction devices, the closest in technical essence to the invention is a device containing a quantizer, the first input of which is connected to the input of the device, the second input - with the output of the clock generator, and the output - with the first input of the phase discriminator, the second input of which is connected to the output controlled pulse generator 2.

The disadvantages of the device are low reliability and the lack of the possibility of major bandwidth tuning, which limits its scope.

The purpose of the invention is to increase the reliability and expand the field of application of the device.

This goal is achieved by introducing a filter and a frequency modulator into the known correction device, the output of which is connected to the input of the clock pulse generator, and the output of the phase discriminator is connected via a filter to the input of the controlled pulse generator.

The drawing shows the functional diagram of the correction device.

It contains a quantizer 1, a phase discriminator 2, a filter 3, a controlled pulse generator 4, a frequency modulator 5, and a clock pulse generator 6.

Corrective device operates as follows.

The input narrowband signal in noise is fed to the quantizer 1, where it is quantized by level, and with a clock sampling rate / d generated by a generator of 6 clock pulses, is fed to one of the inputs of the phase discriminator 2, to another input of which passes a signal from the output of the controlled oscillator 4 pulses. If the frequency of the signal from the output of the adjustable oscillator 4 does not coincide with the frequency of the input signal, then the output of phase discriminator 2 is an error signal, which, having passed through filter 3, controls the operation of the adjustable oscillator 4 so that its frequency coincides with the frequency of the input signal . When these frequencies are equal, the error signal is zero.

The tracking system has a narrow lane.

transmission resulting in

filtering input from noise.

The bandwidth of the device depends on

filter parameters 3 and the sampling rate values. At the initial moment of time, when it is necessary to capture the input signal, the bandwidth of the signal must be wide enough, while at the same time it must be sufficiently good to ensure good filtering. Such a contradiction in known devices is resolved by the time variability of the parameters contained in the filter, and the device is quite cumbersome, complicated and, in addition, due to the discrete nature of the filter elements, the bandwidth can only change in jumps.

In the device, the change in the bandwidth of the dryer is changed by changing the frequency of the generator of 6 clock pulses with the help of the modulator 5 of the frequency according to a given program. At the initial moment of time, the sampling frequency d has a maximum value, which ensures the maximum bandwidth of the correction device, over time the frequency f d decreases according to a law specified by the modulator 5. By the same law, the bandwidth of the device is reduced. At the same time, filter 3 has constant parameters, which are selected from the conditions of stability of trace w; its system.

The proposed correction; its design is naturally simpler in implementation than

known similar devices. In addition, despite the discrete nature of its elements, the sampling rate in this device can be changed smoothly, and the bandwidth of the device smoothly changes, which expands its scope.

Claims (2)

1. US patent number 3872290, class. 235-152, published. 1975. 2.Sizov V.P. Radio engineering and electronics. 1974, Vol. XIX, No. 9, p. 1889, fig. one. entrance Output