SU1495995A1 - Period-to-code converter - Google Patents

Abstract

The invention relates to computing and measuring technology and can be used in automatic control systems in data acquisition devices. The invention allows to reduce the conversion time due to the fact that a shaper 1 and a switch made on the exclusive OR 4 and D-flip-flop 5 are inserted into the device containing the digital periodometer-frequency meter 3. The introduction of these blocks allows to reduce the variance of the time interval between the "Start" signal and the start of the conversion due to the formation of the output sequence by block 2 with a constant phase sign relative to the "Start" signal. 2 Il.

Description

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The invention relates to computing and measuring technology and can be used in automatic control systems in data acquisition devices.

The aim of the invention is to reduce the conversion time by reducing the dispersion of the time interval between the Start signal and at the beginning of the conversion. i FIG. 1 shows a functional converter circuit; in fig. 2 - time diagrams. I The converter contains a pulse former 1, a switch 2 | and a digital periodometer-frequency meter 3.

Switch 2 contains the element

| EXCLUSIVE SHSh 4 and D-flip-flop 5.

I The converter operates as follows.

I Shaper 1 generates rectangular I pulses with logic levels from the input-I harmonic signal, however, before the start signal arrives I, operation of the digital periodometer-frequency- measure 3 is prohibited.

On the Start signal, the initial setting of the digital perimeter-frequency meter 3 is carried out and conversion starts from the O to 1 difference at the output of the switch 2, which, depending on its state (Input (O or 1), at the moment of the signal arrival, the Start inverts ( if input 1) or non-inverted (if input O) input after

constancy of impulses. Thus, the closest to the Start signal, the level difference at the input of switch 2 (from O to 1 or from 1 to O) at its output will always be 1, i.e. the sign of the phase of the signal at the output of switch 2 with respect to the signal Start is the same. Due to this, the dispersion of the time interval T. between the Start signal and the start of the conversion is halved, the total conversion time (Fig. 2) is also reduced by Te / 2.

Claims (1)

Invention Formula The period converter is a code containing a digital periodometer-frequency meter, the control input of which is the Start bus, and the outputs an output field, characterized in that, in order to reduce the conversion time, a pulse shaper and a switch performed on the EXCLUSIVE OR and D element are introduced -trigger whose information input is combined with the first input of the EXCLUSIVE SHS element and connected to the output of the pulse former, whose input is the input bus, the D-trigger clock input is the Start bus, and the output is connected with the second input of the EXCLUSIVE OR element, the output of which is connected to the information input of the digital periodomer-1 hour meter. Phie.g