SU542339A2 - Adaptive time sampler - Google Patents

Description

one

The invention relates to a pulse technique.

The adaptive time sampler is known, which contains a counter that changes its state in accordance with the field p

delta pulses, a control device containing a second counter, a logic element that generates a control signal under the influence of signals from the counters, and a key element 1.

However, the known sampler is complex.

According to the main auth. 394800 is known adaptive temporal sampler, containing a block of signal sampling, block

memory, comparison unit, measuring element and control unit f2l.

The purpose of the invention is to increase the compression ratio of information.

This goal is achieved due to the fact that a differentiation block and a squaring block are inserted into the proposed adaptive time sampler, which are connected in series between the sampler input and the block input.

In comparison, the outputs of the differentiation unit and the squaring unit are also connected to the corresponding inputs of the measuring element.

The drawing shows a structural electrical circuit of the proposed sampler.

The digitizer contains a signal sampling unit 1, a memory unit 2, a comparison unit 3, a measuring element 4, a control unit 5, a differentiation unit 6, a squaring block 7. Input 8 sends an information signal.

Discretization works as follows.

At the beginning of each cycle (at time (; 0), the storage unit remembers the value of the input signal (o) i) which is read from the subsequent current signal values:

4 (t) S (t) -S (0)

During the entire cycle of operation, the measuring element 4 comes from the control unit — a linearly varying voltage; from the memory block - doubled differential voltage 2f (t) -; from the differentiation unit, the voltage of the derivative C (i); from the square squaring block to the voltage derivative of the HH-I J derivative

In this case, the following voltage is output at the output of the measuring element 4:

and - J24 (t} -t4a) -vi3: 44t) ca -tpc-tH

If the input signal is a straight line, i.e. S C-t) oi-t-OF where d and a

- the arbitrary constants, the voltage at the output of the measuring element 4 is zero. If the signal b lil is rejected

from the direct, the non-zero voltage from the input of the measuring element 4 goes to the comparison unit 3.

At the same time, the square of the voltages of the derivative 4 (-t) from the output of the squaring block 7 also goes to the comparison block 3.

Here, by shifting the level by a unit of multiplication (tl value), the voltage is generated due to the permissible approximation error:

u MiMfct)}

as a result, in block 3, a continuous comparison of two alternating voltages is performed: U 2 the moment when equality is achieved, the signal from

block 1 of the signal sample and the outputs of the reset to zero of block 2 and block 5.

The output of block 1 is the countdown of the input signal; in block 2, the new value of the input signal is stored, and from the output of block 5 to the input of the measuring element 4, a control signal is received, which changes linearly from zero to zero. Thus, a new sampling cycle is started, etc.

The described adaptive time sampler, which implements the process of tracking the tangent in natural coordinates, reduces the average sampling rate, which means an increase in its efficiency (higher degree of adaptation ;.

Claims (2)

1. The patent of Germany. No. 2126172, cl. 21a 36/12, 10/4/73. 2.Authorical certificate) USSR No. 394800, cells, Q 06g-3/12, 09.11.71 - prototype. 7 eight Would) (one