SU372727A1 - AMPLITUDE-TIME SIGNAL REGENERATOR - Google Patents

Description

one

This invention relates to a wire connection. The device can be used in the equipment of broadband communication systems with pulse code modulation.

Amplitude-time regenerators of signals are known, which contain a prohibition pulse generator connected to a time delay unit with taps, threshold devices with two stable positions, and an output pulse generator.

The prior art devices perform amplitude selection of a signal by a threshold level and temporal selection by a narrow, as compared with a signal pulse duration by a threshold level, a gating clock frequency pulse. However, under conditions of significant fluctuations in the temporal positions, duration, and shape of the regenerated pulses in such devices, errors arise due to the difference in the time that the pulse signal exceeds the threshold level and the strobe pulse.

In order to increase the stability of the temporal positions of the edges of the regenerated pulses, in the described regenerator of signals, the taps of the time delay unit are connected to the second inputs of the threshold devices.

FIG. 1 depicts functional

2

regenerator circuit; in fig. 2 - time diagrams.

The regenerator contains n threshold devices 1, block 2 of the time delay of the inhibit pulses, the driver 3 of the inhibit pulses of a certain duration, the driver of the output pulses 4.

The digital signal source is connected to the signal input of the first threshold device (PU) with two stable states / 1. The gate input PU is connected to the first branch of the unit 2, the input of which is connected to the output of the imager 3. The input of the imager is connected to the source of pulses of the clock frequency 5.

The output of each PU is connected to the signal input of the next PU, the gate input of which is connected to the corresponding output of block 2, providing a delay

impulses of prohibition for time t in relation to impulses of prohibition of previous PU The output of the last PU In is connected to the input of the output pulse generator of signal 4, the output of which is the regenerator output.

Timing diagrams are presented for the event. The pulses of the original signal (Fig. 2.0 :), subject to regeneration, are fed to the signal input of the NI / i. When the signal exceeds the threshold level / n YAU / i

and in the absence of a prohibition pulse at its gate entrance (Fig. 2.6), the RV / switches from the initial state "O to state" 1 (Fig. 2, e). The reliability of this event is provided by pre-phasing the clock source and selecting the duration of the inhibit pulses. The signal drop from the NPS output / is supplied to the signal input of the NPS / 2. If there is no inhibit pulse at the gate input of the NPS / 2 (Fig. 2, d) or after its expiration, the ZAU) 2 switches from the initial state "O to "1" (Fig. 2, d), and the signal differential from the NI / 2 output is fed to the NI / s signal input. Similarly, the sequential switching process takes place in all other PUs. The fronts of the corresponding inhibiting pulses return to the initial state of the PU (Fig. 2.6, d, e).

This process takes place sequentially from the NU / 1 to the NI / n in accordance with the time shifts in the inhibit pulse distribution circuit.

After the passage of a signal pulse through a CC / 1, the leading edge of the corresponding inhibit pulse records the magnitude and temporary position of the high edge of the signal pulse. The temporal position of the leading edge is determined by the parameters of the input signal pulse (the time of occurrence, the steepness of the rising edge). The magnitude of the pulse fronts at the NPS / i output is determined by the switching time of the NI. Thus, the pulse duration at the NPS output / 1 and the instant of its appearance depend on the pulse parameters of the second signal.

The prohibition pulses at the gating inputs YAU / 2, YAU / s, YAU / n are successively delayed for a time interval t, which is the duration of the duration of the prohibition pulses m3 (). The time zones of operation of these devices are sequentially shifted for the same time interval. At the same time, a value equal to the interval of the prohibition impulse delay gradually reduces the area of uncertainty of the rising edge of the signal pulse at the NF output, depending on the parameters of the regenerated signal. The falling edge of the signal pulse is also sequentially shifted by an amount equal to the interval of the inhibit pulse delay. It can be shown that when performing certain

The conditions of the uncertainty of the time position of the leading edge of the pulse of the signal and the output of the last PU can be reduced to a predetermined allowable value or to zero (Fig. 2, g). In the latter case, this uncertainty will be characterized only by the scatter of the switching time of the last PU.

By successively reducing the uncertainty zone of the appearance of the leading edge of the regenerated pulse, the time parameters of the regenerated pulses are stabilized under conditions of significant fluctuations of the temporal position, duration and shape of the pulses at the input of the regenerator.

The output pulse generator 4 causes the regenerated signal pulses to a form suitable for subsequent transmission (for example, FIG. 2, s).

The required number of threshold devices is determined by the parameters of the regenerated signal and a given degree of temporal regeneration.

For complete regeneration, the required amount of PU is determined by the ratio

T-t

"22 - +1, 1-t

where G is the period of the clock frequency;

gi is the pulse duration of the regenerated signal at the threshold level;

/ n - switching time used in PU;

7 - the coefficient of overlap in time of the action of the prohibition pulses of neighboring PUs (7 0-1).

Subject of invention

Amplitude-time signal regenerator containing an inhibit pulse shaper, the output of which is connected to the input of a time delay unit with taps, successively connected threshold devices with two stable positions and an output pulse shaper, characterized in that in order to increase the stability of the temporal positions of the fronts of regenerated pulses , the taps of the time delay unit are connected to the second inputs of the threshold devices.

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