SU809297A1 - Information compressing device - Google Patents

Description

one

The invention relates to the transmission and automated processing of information and can be used in various fields of technology where information compression is necessary.

A device for compressing information is known, which contains a block of input, the output of which is connected to an input shift register, a decoder, the outputs of which through sequentially

 the connected encoder and the first group of elements And and the output register are connected to the input of the perforator, the polling resistor, the outputs of which are connected to one input of the second group of elements AND, the other inputs of which are connected to the outputs of the selective circuits, the inputs of which are connected to the outputs of the corresponding input blocks, the outputs of the second group elements And connected to the first inputs of the first group of elements And, the second inputs of which are connected to the outputs of the encoder, the outputs of each input register through the first input of the corresponding keys are connected s

with the inputs of the decoder, and the second inputs of the keys are connected to the codes

The first group of elements AND 1 The disadvantage of the device is the low speed with a given compression error in the absence of a priori information about the statistical properties of the signal under study.

The closest in technical essence to the present invention is a device for compressing information containing an analog-to-digital converter, the first input of which is connected to the input of the device, and the output is connected to the first input of the output unit of essential values, the output of which is connected to the first input of the memory unit, the second the inputs of the analog-digital converter, the unit for outputting essential values and the memory unit are connected to the first, second and third outputs of the control unit, respectively, and the output of the memory unit is connected to the output the device 2.

The disadvantage of the device is that in the absence of a priori

5 distribution law information

probabilities of the processed case; its signal, in order to preserve a given error due to the compression of information, it is necessary to select manually

0 parameters of the issuance of essential

values. A low degree of automation can lead to a significant delay in the conversion time, which reduces the speed of the device.

The purpose of the invention is to increase the speed of the device while maintaining the specified error in the absence of a priori information about the statistical properties of the processed signal.

This goal is achieved by the fact that in a device for compressing information containing an analog-digital converter the first input of which is connected to the input of the device, and the output is connected to the first input of the output unit of essential values, the output of which is connected to the first input of the memory unit. the control, the outputs of which are connected to the second inputs of the analog-digital converter, the unit for outputting significant values and the memory unit, the output of the memory unit is connected to the output of the device, a subtraction unit, a quadrant, averager are entered, the comparison unit and the error setting unit, the first and second inputs of the subtraction unit are connected respectively to the first input and to the output of the essential value subtracting unit, the output of the subtraction unit is connected via a quad with the averager input, the output of which is connected to the first input of the comparison unit, the second input of which is connected to the output of the error setting block, and the output with the input of the control block.

FIG. 1 shows a block diagram of the device; in fig. 2 is a block diagram of an example implementation of a unit for outputting significant values and a control unit.

The device for compressing information contains an analog-to-digital converter 1, a unit 2 for outputting significant values, a block 3 of memory, a block of control 4, a block 5 of subtraction, a quad 6, an averager 7, a block 8 of comparison, a block 9 specifying an error.

Unit 2 of the issuance of significant values contains, for example, register 10, subtractor 11, key 12, counter 13 comparator 14.

The control unit 4 comprises, for example, a pulse generator 15, a frequency divider 16, a counter 17, a switch 18.

The device works in the following way.

The signal being processed is digitized by the analog-to-digital converter 1 at discrete points in time with a step db, specified by control unit 4. The temporal discretization step is determined based on a priori information about the upper cutoff frequency of the signal being processed, and in the absence of this information, depending on the value

the upper limit of the frequency range of the device. In block 2, the output of significant values in accordance with the type of algorithm implemented in it is carried out the selection of essential values. In block 2, data compression algorithms with one-parameter and multi-parameter adaptation can be implemented, based on the chosen recovery method.

 compressed data, simple enough

the data compression algorithm is implemented, based on extrapolating the zero order with a constant aperture. In this case, the initial value of the aperture is set, for example, the maximum

5 for the proposed compression device. information.

In block 2, the current difference between the last significant value is formed at subtractor 11 (FIG. 2)

0 stored in register 10, and the current sample value. The formed difference is compared on comparator 14 with a predetermined aperture coming from counter 17. In the case

5 if the current difference is greater (modulo aperture, then the comparator 14 generates a pulse that opens the digital key 12, allowing the issuance of a new significant value,

as well as the code of the corresponding time interval formed

counter 13. The trailing edge of the pulse records the new significant value in the register 10 and zeroing the counter 13.

5 from the output of the essential value output unit 2, substantial samples are fed to the memory unit 3 and to the subtraction unit 5. At the same time, service information Qi, the code of the time interval between the essential values, is needed in memory block 3, which is necessary to preserve the time scale when restoring a compressed signal.

In series connected

In subtraction blocks 5, quadrant 6 and averager 7, the value of the square of the actual mean square error from data compression is generated, which in 8 is compared to the specified value from the error setting block 9. According to the results

 control unit 4 controls the values of the parameters of unit 2

outputting significant values (apertures, if extrapolation is used. zero order) until the ratio n

0 (f (fy

where (fft, f is valid and given rms errors from compression information support.

Claims (1)

Claim A device for compressing information containing an analog-to-digital Converter, the first input of which is connected to the input of the device, and the output