SU898428A1 - Differentiating-smoothing device - Google Patents

Description

(5) DIFFERENTIATING SMOOTHING DEVICE

The invention relates to automagne and can be used to differentiate pulse frequency signals in the presence of interference. A differentiating-smoothing device containing a reversible counter, a binary multiplier, a frequency divider and a subtraction unit is known. The closed circuit of the device is reduced precision and speed. sign switch, the first input is to the input signal input bus, and the second input to the output of the first converter is the frequency code connected by a code input from the output the house of the first reversible counter, the summing and subtracting inputs of which are connected to the outputs of a sign switch connected by an information input to the output of the second converter; CDR-frequency connected by a code input to the output of a second reversible counter connected by a subtracting input to the output of the third code-frequency converter; the input of which is connected to the output of the second reversible counter, the sign output of the subtraction unit and the output of the second code-frequency converter are corresponding to TBiBHHo frequency and frequency outputs of the device, and the frequency output of the subtraction unit is connected to the summing input of the second reversing counter C23. The disadvantages of this device are relatively low accuracy and speed with a predetermined limited range of variation of the output signal of the device. The aim of the invention is to improve the accuracy and speed with given restrictions on the range of variation of the output signal.

To this end, a differentiating smoothing device containing a subtraction unit connected by a sign output to a control input of a sign switch, a first input to an input signal input bus, and a second input to an OUTPUT of the first code-frequency converter connected by a code input to the output of the first reversing counter, the summing and subtracting inputs of which are connected to the outputs of the sign switch connected by the information input to the output of the second code-frequency converter connected by the code input To the output of the second reversible counter, connected by a subtracting input to the output of the third code-frequency converter, the code input of which is connected to the output of the second reversible counter, the sign output of the subtraction unit and the output of the second code-frequency converter are respectively the sign and frequency outputs of the device; a frequency multiplier connected by an input to the frequency output of the subtractor, and an output to a summing input of the second reversible ctieT4MKa.

The drawing shows a block diagram of the differentiating-smoothing yct.

The device circuit contains a block of 1 subtraction connected by a sign output to the control input of the sign switch 2, the first input to the input signal bus, and the second input to the output of the first code-frequency converter 3, which is connected by a code input with the output of the first reversing counter It The summing and subtracting inputs of which are connected to the outputs of the sign switch 2. The information input of the switch 2 is connected to the output of the second code-frequency converter 5 connected by code input j to the output of the second reversible of the second counter 6, the counter 6 of the connection with a summing input with the output of the frequency multiplier 7, and the subtractive input with the output of the third code-frequency converter 8 connected with a code input to the output of the estimator 6, the input of the multiplier 7 is connected to the frequency output of the subtraction unit t, and the sign output The subtraction unit 1 and the output of the code rate converter 5 are respectively the sign and frequency outputs of the device.

The device works as follows.

The subtraction unit 1 compares the input signal Fx (t) with the output signal F, (t) of the 3 code-frequency converter. The selected frequency difference AF (t) F (t) -F (t) through

a frequency multiplier 7 with a multiplication factor cc is fed to the input of a tracking system, which consists of a reversible counter 6 and a code-frequency converter 8. present value

code N (t) and the counter 6

N (t) (t) -N (t) dt,

where n is the number of bits of the counter 6; FO - reference frequency transform and clock 8 {

 the time constant of the follow system is converted by converter 5 to the output frequency F. (t) of the device:

F (t) N. (t). ,

where kFg is the reference frequency of the transducer 5,

k is a constant coefficient. The resulting output frequency is integrated in counter k and converted by converter 3 to frequency F, (t):

F, (t) brlK (t) dt,

- number of counts

m ka 4,

FO - converter frequency reference 3,

 - constant time of the counter k and converter 3.

In accordance with the above expressions, the transfer function of the device is

(-Y

N) ,,

.LK f eCj, g

those. corresponds to a differentiating smoothing device of second order.

In this case, the range of variation of the output frequency F (t) of the device is 0-kF, Hz and depends only on the value of the coefficient k at a given frequency. ,

Thus, at a predetermined and limited range of variation of the output signal F (t), the device

Claims (1)

Claim A differentiating-smoothing device containing a subtraction unit connected by a sign output to the control input of the sign switch, the first input to the input signal input bus, and the second input to the output of the first code-frequency converter connected by the code input to the output of the first reversible counter, summing and The IS subtracting inputs of the second converter and increase accuracy and speed with given restrictions on 898428 * of the second reversible counter connected by the subtracting input to the output. a third code-frequency converter, the code input of which is connected to the output of the second reversible counter, and the sign-in output of the subtraction unit and the frequency output are designed to change the output signal range; an additional frequency multiplier connected to the input with the frequency output of the subtraction unit is additionally introduced into it, and the output m with the summing input of the second reversible counter.