SU391587A1 - INTERVAL TIME CONVERTER TO DIGITAL CODE - Google Patents

Description

one

This invention relates to an analog-to-digital time-slot-to-digital converter.

Time-code converters for converting one-time intervals to a digital code are known, containing a p-stroke pulse generator of a reference frequency and a pulse counter, the lower bits of which contain n counting cells, each of which is connected to one of these outputs via an input pulse generator reference frequency.

The aim of the invention is to simplify the device and reduce the delay of the transfer chain.

This is achieved by inserting n two-bit counters into the lower bits of the counter, the same-named outputs of each cell through the sequentially connected multiple-input logic cell of the AND and the driver are connected to the counter input of the higher-level bits of the counter.

The drawing shows the functional diagram of the proposed Converter.

It contains a circuit / start-pulse, valves 2 at the output of each clock pulse of the reference frequency generator; The generator 3 impulses of the reference frequency (diffraction near each output conditionally denote

the order number of the beat); scoring cells — and 5 two-digit counters, respectively, constituting the lower and upper digits of the converter counter (the entire pulse counter is not shown in the drawing); harness b, combining the same (single) outputs of the cells of two-bit counters, multi-input circuit "And 7, having 2 n inputs, driver of 8 pulses, counting input 9

the higher bits of the counter of the converter, the first 10 and the second 11 cells of the higher bits of the counter of the converter, the circuit 12 of the stop-pulse.

At the time of passage through the chain 1 start-pulse

valves 2 open, and from the corresponding outputs of the d-ta-kt generator 3 to the counting inputs of the cells 4 begins to arrive, respectively, pmpulses the reference frequency. In this case, the first is triggered cell 4 of that measure,

the pulse of which, but the time will be closest to the moment of the appearance of the start-pulse after its appearance. Cells 4 and 5 are connected according to the binary counter scheme; therefore, the frequency of cell 5 is two times lower than the frequency of cell 4.

At the moments of time when all cells 4 n 5 are in the zero position, the output of the multi-input logic cell 7 produces a signal of non-transfer to the higher bits

counter. The duration of the transfer pulse during the operation of the counter is equal to tin, therefore cell 7 should have a limit frequency of tin times greater than the limit frequency of switching cells 4. The frequency of transfer pulses to higher bits is four times lower than the pulse frequency of the generator 3 therefore, the limiting frequency of cell 10 can be four times lower than cell 4. To increase the duration of the transfer pulse at the output of the logic circuit "And 7 is the driver 8. The counter is closed in m The arrival time of valves 2 but chains 12 of the stimpulse, after which, according to the state of the cells 4, 5, 10, 11, etc., can be judged on the value of the time interval being transformed. The maximum conversion error of the proposed device is tjn, where / is the duration of the period of the pulse of the reference frequency from the generator 3 output. Subject selectable the second inputs of which are connected to the input “start-pulse of the converter, and the third inputs - to the input“ stop-pulse of the converter, the outputs of the valves are connected accordingly but with the trigger inputs n the lower bits of the pulse counter, characterized in that, in order to increase the speed and simplify the device, n additional triggers of lower-order bits, the inputs of which are connected to the outputs of the corresponding low-level triggers, are entered into the pulse counter A multi-input “I” circuit is introduced, the inputs of which are connected to the outputs of the main and additional low bits of the pulse counter, and the output is connected to the high-trigger trigger input of the pulse counter.

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