SU544126A1 - Multichannel analog-to-digital converter - Google Patents

Description

The invention is intended for time separation and transformation into serial binary code information from pistochnikov, expressed in analog values, voltage amplitudes, with intermediate conversion in the time interval and can be applied in information transmission systems. The analog-digital converters are built according to the method of single weighting and sequential counting, which use the method of comparing standards with input signal jY. However, they are distinguished by the difficulty of setting standards and a comparison unit. A multichannel analog-to-digital converter is known, which contains a block of formation of channel intervals and switching. Connected to the input of the amplitude-time converter, the output of which through a two-input match element is connected to the counter input, a master oscillator whose output is connected to the second input of the two-input matching element, a reset node whose output is connected to the reset input of the counter 2. This device has limited functionality. The aim of the invention is to enhance the functionality of the converter. This is achieved by the fact that a multichannel analog-to-digital converter containing a channel interval shaping and switching unit connected to the input of an amplitude-time converter, the output of which, through a two-input match element, is connected to the counter input specifies a generator whose output is connected to the second input of a two-input element match, the reset node, the output of which is connected to the reset input of the counter, a shaper of pulse sequences, three-input elements with coincidence and combining element, moreover, one of the inputs of the channel interval shaping and switching unit through the shaper of T1 bit pulse sequences is connected to the master oscillator, and

the output is connected to the first inputs of the three-input matching elements and the input of the reset unit, the second inputs of the three-input matching elements are connected to the outputs of the discharge pulse trainer, the third inputs are connected to the outputs of the counter, and the outputs are connected to the inputs of the combining element.

FIG. 1 is a block diagram of the device.

It contains a block 1 of formation of time slots and switching, an amplitude-time converter 2, a two-input coincidence element 3, a master oscillator 4, a counter 5, three-input coincidence elements 6-9, a pulse pattern generator 10, a combining element 11 and node 12 reset.

To the input of block 1, the formation of time slots and commutation is received by n-transmitted messages. At the output, an amplitude-modulated message pulse appears in accordance with the channel slot number and is fed to the input of amplitude-time converter 2, which converts the pulse amplitude into a time interval. In accordance with the duration of this time interval at the output of the two-input element 3, the coincidence of the pulses from the master oscillator 4, sets the counter 5 to the state determined by the last pulse. The outputs of counter 5 are connected to one of the inputs of three-input elements of coincidence 6-9, the second input of which is assigned to the codes of the sequences of discharge pulses from the generator of 10 discharge sequences of pulses, and the third input of the intervals and switching . The outputs of the three-inlet matching elements 6-9 are connected to the combining element 11. After the end of the coding cycle, the reset node 12 sets the counter 5 to the initial state.

FIG. Figure 2 shows the time diagrams of the operation of the multichannel digital converter for case 4, P 16, where k is the number of bits in a sequential binary code; n - the number of transmitted messages.

The device works as follows.

Pulses from the output of master oscillator 4 (Fig. 2a) with frequency f where is the quantization frequency of the original message, determined by the bandwidth of the transmitted message, sent to one of the inputs of the two-input match element 3, to the other input of which time intervals arrive (Fig. 2d) from the output of the amplitude-time converter 2, corresponding in duration to the amplitude of the transmitted message defined by the pulses -t-goi of i-channel intervals (Fig. 2, c, b,) with a frequency where is f,

- channel frequency

KU

intervals.

At the output of the two-input coincidence element 3, a series of pulses appears (Fig. 2, d determined by the duration of time intervals from the amplitude-time converter 2. The last pulse of this series sets the counter 5 to the state defined by Fig. 2, e, g, h, and. The outputs of counter 5 with the states defined in Fig. 2, e, g, 3, and are connected to one of the inputs of a three-input coincidence element 6 to 9. In a period of time corresponding to half the length of the channel interval, from one of the outputs of the block 1 formation of time intervals and switch The impulse impulse (Fig. 2, o) comes in. At the same time interval, the third of the inputs of the three-input elements of coincidence 6-9 appears discharge sequences of pulses (Fig. 2, k, l, m, n) s frequency fp 2-к п f кз. where f p is the frequency of the discharge pulse sequences.

As a result of polling counter 5 at the output of combining element 11, a code appears corresponding to the amplitude of the transmitted message switched in a given channel interval (Fig. 2, p). After the polling pulse has completed, the reset unit 12 forms a short pulse (Fig. 2, p) to set the counter 5 to its original state.

Claims (2)

1. USSR author's certificate No. 309457, M.C.L. H 03 K 13/19, 1971 equivalent). 2. Universal electronic data converters. Ed, VB See tin 1971, pp. 45-56 fig. 46 (prototype). 27 g, Output figure 1