SU788407A1 - Device for measuring telegraphy rate - Google Patents

Description

(54) DEVICE FOR MEASURING TELEGRAPHIC SPEEDS

one

The invention relates to telecommunications and can be used in demodulators and telegraph signal synchronizers.

A device for measuring the speed of cabling is known, which contains the front of the control signal, the first multiplier, the input of which is combined with the input of the second multiplier, and the output connected to the first input of the comparison unit 1.

However, the known device can only work with signals in which the series of characters are the same in duration.

The purpose of the invention is to provide a speed measurement for different durations of a series of identical symbols in the input signal.

To achieve this goal, a telegraph speed measurement device containing a control edge driver, the first multiplier, whose input is combined with the second multiplier input, and the output connected to the first input of the comparator unit, has a timer and a smoothing filter, and the controller front driver output the signal is connected via a serially connected timer and a smoothing filter to the input of the first multiplier, the output of the comparison unit is connected to the second input of the timer, and the second input of the comparison unit combined with the output of the timer, the output of the second multiplier is connected to the third input of the timer, the fourth 5 input of which is combined with the output of the smoothing filter.

The drawing shows a structural electrical circuit of the proposed device.

The device for measuring the speed of wiring contains a driver 1 for the front control signal, a timer 2, a smoothing filter 3, a unit 4 for comparison, the first and second multipliers 5, 6.

The device works as follows.

Let t J, ti ... be the consecutive time instants of a change in the signal at the input of the device. At each time t (i 1, 2 ...), driver 1 generates a control signal. When this signal arrives, a timer value of 2 x is applied to the smoothing filter 3, on timer 2 it is set

20 value from the output of the smoothing filter 3 - Yj ,, timer 2 starts. On the upper side of the smoothing filter 3 we have y, where. P; 1. Block 4 Comparisons Post H)

compares the value on timer 2 with the output value of the first multiplier 5; when the first value reaches the second value, a control signal is generated. When this signal arrives on timer 2, the value from the output of the second multiplier 6 is set, and timer 2 starts, but the output of timer 2 is not applied to the smoothing filter 3. The value removed from timer 2 at the moment

b-r {i H Let Y {.- j be equal to the duration of the elementary premise, tj.-t;., Aj. - the length of the series to the same parcels is distorted, then

XV YL-I -f Al, with AL -,

thus x is the reduction of the length of the series to the duration of the elementary parcel. Distortion Ai. removed by a smoothing filter 3.

Claims (1)

Claim device Measuring the speed of wiring, containing the front of the control signal, the first multiplier, the input of which is combined with the input of the second multiplier, and the output connected to the first input of the comparator, characterized in that in order to measure the speed at different durations of the series characters in the input signal, a timer and a smoothing filter are introduced, and the output of the driver front of the control signal is connected via a serially connected timer and smoothing vayuschy filter to the input of the first multiplier, the output of comparator unit is connected to the second input of the timer, and the second input of the comparison unit is combined with the output of the timer, the output of the second multiplier is connected to the third input of the timer, a fourth input of which is combined with the output of the smoothing filter. Sources of information taken into account in the examination 1 USSR author's certificate No. 474114, cl. H 04 1 7/02, 1972 (prototype).