SU892413A2 - Meter of intervals between pulse centers - Google Patents

Description

(54), INTERVAL METER BETWEEN THE MIDDLE

PULSES

The invention relates to a radio metering technique and can be used in radio devices for measuring the duration of time intervals between the centers of pulses. According to the main author. St. No. 661385, a device for measuring the intervals between the midpoints of pulses is known, which contains a pulse generator, the output of which is connected to the element AND and through a frequency divider two to another element AND the outputs of both elements AND are connected to the counting input of the main reversible pulse counter, and There is also an additional node that controls the elements of the IR, which consists of two blocks of di (}) amplification, two converters of different polarity pulses into unipolar, an additional reversible counter and an element EXCLUSIVE OR tilThe disadvantage of this device is the low measurement accuracy. The purpose of the invention is to increase the accuracy of measuring the intervals between the middle. us impulses. The goal is achieved by the fact that a known interval meter between the midpoints of pulses contains a clock pulse generator, the output of which is connected to the element AND, as well as through a frequency divider two to another element AND, and the outputs of both elements AND are connected to the counter input of the reversible pulse counter , two differentiation units, to the inputs of which input pulse signals are fed, two converters of different polarity pulses into unipolar, connected directly to the differentiation units, in pomogatelny reversible ELAPSED 1k summarizing vychitak conductive and whose inputs are connected to outputs of converters, and outputs sign and. the content module is equal to two ugflavl respectively by typing the account of the main reversible counter and one

from the AND elements connected directly to the clock generator output, and the EXCLUSIVE OR element, whose output is connected to the input of another AND element, further introduced the AND element and the OR element, and the output of the EXCLUSIVE OR element is connected to the first input of the additional AND element, the output of which is connected to the counting input of the frequency divider into two, and the second input - to the output of the clock pulse generator and pulse inputs of the AND elements, the outputs of which through an additional OR element are connected to the counting input An explicit recursive pulse counter.

Fig, 1 presents an block diagram, measuring the intervals between the midpoints of the pulses; in fig. 2 - time we of the auxiliary reverse of the account with half the frequency is repeated

sive counter, depending on the mutual location of the input pulses.

The meter contains a generator of 1 clock pulses, logic elements 2-4, a .rogic element OR 5, a frequency divider 6 into two, reversible counters of the main 7 and auxiliary 8, output 9 sign of the auxiliary counter 8, controlling the counting direction of the main reversible counter 7 and output 10, the content module is equal to two, blocks 11 and 12 of differentiation, their inputs are connected with buses 13 and 14 of input pulse signals, converters 1S and 16 different polarity pulses into unipolar, controlling summing and subtracting counting inputs The wide reverse counter 8, the logical element EXCLUSIVE OR 17 and the installation input 18. The device operates as follows. iB in the initial state, the counters 7 and 8 and the frequency divider 6 are in the zero state; Blocks 11 and 12 and converters 15 and 16 form short pulses, indicating the beginning and end of the input signals | which are counted by a reversible counter 8. Depending on the relative position of the input pulses, there are only six possible options for the operation of counter 8, for timing charts (Fig. 2). When a top-end with one input pulse is present on buses 13 and 14, a logical unit level appears at the output of the logic element EXCLUSIVE OR 17, the main counter 7 counts the pulses, running through 1, divider 6, and elements 4 and 5 and having a frequency following equal to half the frequency of the generator 1. In this case, the state module of the auxiliary counter 8 is equal to one. However, if one of the input pulses has already passed, and the second is not yet wired, the state module of counter 8 is equal to two, at output 10 the signal of a logical unit and, therefore, counter 7 counts the pulses passing through elements 2 and 5 with the frequency generator 1. In this case, the counting direction is determined by the signal from output 9 of the reverse

counter 8. At the end of the count, the state of the reverse counter 7 corresponds to the interval between the midpoints of the pulses presented in the additional code. In kagkdom cycle measurement interval

Claims (1)

twice. An additional element AND 3 is allowed to save the remainder of the half frequency count from the first interval and start counting in the second interval taking this residue into account, which improves the measurement accuracy. The initial setting of divider 6 eliminates the uncertainty at the beginning of the account caused by this divider. Therefore, at the end of the measurement, the balance of the account stored. in divider 6, will be more reliable; and can be used to refine the estimate of the time interval. In the case when the divider 6 (1C: | 1st on the trigger) switches to one state simultaneously with the end of the first half-frequency counting interval, a false counting pulse may appear at the output of the logic element And, due to a longer delay on the element 17 than in the circuit, element 3 is divider 6. This is especially dangerous if the input signals are previously subjected to clocking by the frequency of the generator 1. The introduction of additional f communication from the generator to the input of the element I eliminates the likelihood of momentum of, increasing the accuracy of measurement. The invention Meter intervals between the midpoints of the pulses by author. St. No. 661385, characterized in that, in order to improve the measurement accuracy, an element OR is added to it, the element OR, and the output of the element EXCLUSIVE OR is connected to the first 589 input of the additional element AND whose output is connected to the counting input of the frequency divider by two, and the second input to the output of the clock pulse generator and the pulse inputs of the AND elements, the outputs of which through the additional OR element are connected to the counting input 3 of the main reversible pulse counter. Sources of information taken into account during the examination 1. USSR Authorship Certificate No. 661385, KW. G O4 F 10/01, 1977. as.l Ul. Z