SU869027A1 - Smoothing converter of alternative pulse-frequency signals to code - Google Patents

Description

(54) SMOOTHING CONVERTER OF SPECIFIC VARIABLE FREQUENCY-PULSE SIGNALS TO CODE

The invention relates to computing and measurement technology and can be used as a converter for inputting the values of a frequency-pulse signal in a digital computer and as an autonomous frequency meter combining the functions of conversion and smoothing of noise. A continuous digital representation frequency meter is known, consisting of an OUT reversible counter and a binary multiplier, with the reversible counter outputs connected to the potential inputs of a binary multiplier, and the output of the latter connected to the negative input of the counter tU. The disadvantage of this device is the impossibility of measuring alternating frequency-pulse SIGNSHOV. Closest to the technically proposed converter of alternating pulse-frequency signals into a code containing a reversible counter with a subtracting device and a trigger - a sign, a binary multiplier, a pulse distributor, a switch of the number of additional bits, a node of the coinciding pulses, and the sign outputs the trigger is connected to the inputs of the pulse distributor 2. The disadvantage of this device is the low speed, due to the fact that the change of the sign of the result produced It takes two clocks, and the impossibility of obtaining a result in an additional code makes it difficult to interface this device with a DVR, in which, as a rule, numbers are represented in an additional code. The purpose of the invention is to increase the speed. The goal is achieved by the fact that the smoothing converter of alternating pulse-frequency SIGNSHOV in code containing a pulse selector, to the first input of which is connected the bus of the first input frequency, the subtraction unit, the outputs of which are connected to the inputs of additional bits of the reversible counter, the outputs of which are through the switch connected to a group of outputs of a binary multiplier, whose octagous inputs are connected to the outputs of the main bits of the reversing counter, the first output of which is the last bit connected to one of the inputs of the sign trigger, the reference frequency bus is connected to the binary multiplier input, two OR elements are additionally introduced, the AND element and the pulse selector, the main selector outputs are connected through the first OR element to the totalizer input, the additional selector outputs are connected via the second OR element to the subtractive input of the subtraction unit, the bus of the second input frequency is connected to the first input of an additional selector, the second input of which is connected to the output of the binary multiplier, second The last output of the last counter of the reversible counter is connected to the second input of the sign trigger, the output of which is connected to the outputs of the main bits of the reversible counter, the output of the device and the first input of the And element, the second input of which is connected to the reference frequency bus, and the output to the second input of the main selector .

The drawing shows the block diagram of the device.

The converter contains a reversible counter containing the main 1 and additional 2 bits, trigger 3 characters, subtraction block 4, selectors 5 and b of coinciding pulses, elements OR 7 and 8, binary multiplier 9,

111

-one

+ 1

111

Note .X, Y - frequency pulses F, Fv /, respectively, Fvj F - F, -frequency at the output of subtraction unit 4, which is generated from frequencies coming from the binary multiplier and element I.

After a negative number i1 I 111 is formed in the counter (corresponding to TJO 01 in the direct code), element 11 is opened, and the reference frequency begins to flow through the selector 5 and the element OR to the positive input of the 4 subtraction, resulting in its positive output FF differences. After the end of the transient, the positive pulses of the difference F-F are commenced by the negative pulses fed to the bus -F.

Thus, the counter is set to a negative number, represented in the additional binary

switch 10 of the number of additional bits, element and 11, one input of which is connected to the trigger output of 3 characters, and the second to the reference frequency bus, output of the AND 11 element through the selector 5 and element OR 7 is connected to the summing input of block 4, the selector inputs 5 and 6 matching pulses are connected respectively to the buses 12 and 13 of the input frequency (-F) and (+ Fy).

 The device works as follows.

With a positive signal, the pulses go to bus 13 (+ RD) and a positive code is set in the counter, trigger 3 is in the zero state, And 11 is closed, feedback pulses are received only from the output of the binary multiplier through selector 6, and OR 8 to the negative input of block 4. In this case, the operation of the device does not differ from the operation of known devices with a positive input signal.

With a negative input signal, the pulses go to bus 12 (-Fx) and the value of the number in the counter begins to decrease. This process is illustrated by a table.

+0.125 F

0.875 F

+0.125 F

0.875 F

code and the corresponding measured. negative signal F (t). These data, without any additional transformations, can be entered into digital computers, the numbers of which are also represented in the additional code. To change the sign of the result, it takes not two clocks, as in a known transducer, but one beat, which improves speed and allows you to measure signals with a higher frequency.

Claims (2)

Invention Formula Smoothing converter of alternating pulse frequency signals into a code containing an impulse selector, the first input of which is connected to the first input frequency bus, a subtraction unit, whose outputs are connected to the inputs of additional digits of the reversible counter, the outputs of which are connected via a switch to the output multiplier of a binary multiplier , the remaining inputs are connected to the outputs of the main bits of the reversible counter, the first output of the last bit of which is connected to one of the inputs of the trigger of the sign, An oro frequency is connected to the input of a binary multiplier, which is characterized by the fact that, in order to increase speed, two OR elements are additionally introduced, AND element and pulse selector, and the outputs of the main selector OR are connected to summing up input of the subtractor, outputs an additional selector through the second element OR is connected to the subtractive input of the subtraction unit, the bus of the second input frequency is connected to the first input of the additional, selector, the second input of which is connected to the output of the binary the multiplier, the second output of the last bit of the reversible counter is connected to the second input of the sign trigger, the output of which is connected to the outputs of the main bits of the reversible counter, the device output and the first input of the And element, the second input of which is connected to the reference frequency bus, and the output to the second input main selector, Sources of information taken into account during the examination 1.Wood R.A. Frequency Meter | Digital presentation j.- The Radio and Electronic Engineer, Ang. 1963, 26 W 2. 2. Authors certificate of the USSR 194416, cl. G 01 R 23/10, 1966 (prototype).