SU536463A1 - Device for changing pulse frequency - Google Patents

Description

one

The invention relates to measurement technology and automation and can be used, in particular, to determine the static and dynamic parameters of differentiating devices.

A device for changing the pulse frequency is known, which contains a controlled oscillator, a frequency divider connected to the output of the controlled oscillator, a phase detector, the first input of which is connected to the output of the frequency divider, the second input to the signal source of the measured frequency, and the output through the first filter a low frequency is connected to the input of the controlled oscillator, a master oscillator, a controllable delay unit, the input of which is connected to the output of the master oscillator, and a pulse counter, the input of which is connected to the output match schemes.

However, this device does not provide linear frequency variation over time.

It is also known a device for changing the pulse frequency, which contains a control frequency divider, whose input is connected to an exemplary frequency generator, and the output is the device output, the first counter, the discharge outputs of which are connected to a controlled frequency divider, the second counter, input which is connected to the output of the controlled frequency divider, the output is connected to the reset circuits of the first counter, and the counting input of the first counter is through the circuits; - OR and the decoder is connected to the output of the bits of the second counter.

However, this device has insufficient frequency variation accuracy.

The purpose of the invention is to improve accuracy.

This is achieved by the fact that a device for changing the pulse frequency, containing two counters, an exemplary frequency generator and the first controlled frequency divider, one of the inputs of which is connected to the first generator output of the reference frequency, two other inputs are connected to the outputs of the first counter, and the output the output of the device, provided with two additional controllable frequency dividers connected in series and connected between the second generator output of the reference frequency and the input of the first counter, mp This generator output of the reference frequency is connected to the / counter of the second counter, the outputs of which are connected to the inputs of the second controlled frequency divider and to the inputs of the third controlled frequency divider. The drawing shows the functional diagram of the device for changing the pulse frequency. This device contains the first controlled frequency divider 1, the input of which is connected to the generator 2 of exemplary frequency, the first counter 3, the outputs of the bits of which are connected to the first controlled frequency divider 1, the second controlled frequency divider 4 and the third controlled frequency divider 5, connected in series, and the second counter 6, the outputs of which are connected to the second and third controlled frequency dividers 4 and 5. The output of the second controlled frequency divider 4 is connected to the input of the first counter 3, and the input of the third controlled frequency divider 5 is connected to the generator 2 exemplary frequency. The output 7 of the device is connected to the output of the first controlled frequency divider 1. This device operates as follows. The input of the first controlled frequency divider 1 is the frequency K from the generator 2 of the exemplary frequency, where K is the proportionality coefficient that takes into account the coefficient of transmission of the exemplary frequency on the generator 2 output connected to the input of the first controlled frequency divider 1. Frequency at the output of the first controlled divider Frequency 1 is determined by the expression i (i) (t), where E (t) is the current code value in the first counter 3. In the first counter 3, before starting the operation, the E code is recorded. When the first counter 3 operates in the subtraction mode, the current code value in it is determined by the expression i EiH-Ifz t- “3i, where Ct) is the current frequency value at the output of the second controlled frequency divider 4. So as the second and third controlled frequency dividers 4 and 5 are connected in series, controlled by the same code of the second counter 6, and the frequency K f from generator 2 is fed to the input of the third controlled frequency divider 5, where K is the proportionality coefficient taking into account the coefficient transfer of exemplary tea the output of the generator 2 connected to the input of the third controlled frequency divider 5, the current frequency at the output of the second controlled frequency divider 4 is determined by the expression. (- t) K.,), where "(t) is the current code value In the second counter 6. On the second counter 6, before starting work, the code input of counter 6 is recorded during operation from the output of generator 2 pulses with a frequency of 3 to D 3 are proportional to the coefficient of transmission of the reference frequency at the output of generator 2 connected to the input of second counter 6. When the second counter 6 operates in the addition mode, the current code value in it is determined by the expression. Then the current code value in the first counter 3 is I, (t) b, o Accept E.jj K. / K. / E, we get f.sh-- VK, - l / E ,, - t Then the expression for the current frequency value at the device output becomes ib f, (t) JoV Therefore, the frequency at output 7 of the device changes linearly depending on of time.

Claims (1)

Invention Formula A device for changing the pulse frequency, which contains two counters, an exemplary frequency generator and the first controlled frequency divider, one of the inputs of which is connected to the first output of an exemplary frequency generator, two other inputs are connected to the outputs of the first counter, and the output is an output device 6 VA, characterized in that, in order to increase accuracy, it is equipped with two additional controlled frequency dividers connected in series and connected between the second generator output of the reference frequency and the input of the first counter, the third generator output of the reference frequency is connected to the input of the second counter, the outputs of which connected to the inputs of the second controlled frequency divider and to the inputs of the third controlled frequency divider.