SU556478A1 - Device for data transmission with redundancy of information - Google Patents

Description

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The invention relates to the field of measuring information technology and can be used in multi-channel measuring and information systems in which the principle of typing (tabular) form of representation of measuring signals when transmitting them via communication channels is used.

Measuring information systems are known, whose characteristics for improper performance include computing devices for reducing the redundancy of measurement data, performing adantive tabulation from the warning signals and leveling the compressed data stream over time before entering them into the data transmission channel.

In the indicated device, there is a cell in the bz-fern drive reserved for recording, but no entry has been made. They are stored in reserved cells, the numbers of which are Xranc of the memory block of the addresses of the cells, are made if the measurement process is nonstop (Approximate polynomial exceeds some given value.

Since reserved cells are attached to the buffer accumulator, for which the read mode must be excluded, since it was not recorded into it, it is in a certain measure that limits the capabilities of the device. Such an exception is possible when the speed of data output from the buffer storage device is lower than the data arrival rate on the device input. Therefore, the continuous mode of multiple reading of arrays of compressed data from the buffer accumulator, because such modes require a higher speed of data output from the buffer accumulator, than the speed of data

device input. In addition, since writing to the buffer storage takes place only when a certain specified error value is exceeded, there is no limit on the device to the maximum approximation limit: it remains unknown how much it exceeded (the approximation error is a specified value.

The closest in technical essence to the invention is a device for data transmission with reduced redundancy of infarmation, containing a data storage unit, one input of which is connected to the input of the device, another input and the first input of the memory block of addresses of the cells connected to the output

the data source number generator, the second input of the memory cell of the addresses of the cells is connected to the indicator of the first free cell, the output of the data storage block is connected to the first inputs of the tabulator and the control block of the approximation error, the first

the output of which is connected to the first input of the tabulator. The first output of the tabulator is connected to the second input of the block to the “control room” approximation, the output of the first protection indicator of the cell is connected to the first input of the “buffer accumulator”.

The known device also doesn’t allow multiple reads of a compressed data array, since the data output rate from the buffer storage device exceeds the data arrival rate at the device input.

The purpose of the invention is to expand the functional capabilities of the device.

The goal is achieved by the fact that ycTipoECTBo is entered n & switchable, the output of each of which is connected 1 directly to the second and third inputs of the buffer storage device. The second output of the approximation error control unit is connected to the first inputs of the first and second switches, the second output of the tabulator and the input of the device. The device is connected respectively with the second and third inputs of the first switch. The output of the indicator of the first free cell and the output of the memory block of the switches, the cells are connected to the second and third in the soda of the second switch.

The block diagram shows a block diagram of a device for data transmission with contraction, redundancy of information.

The device contains input 1, data storage unit 2, data source number generator 3, tabulator 4, cell address memory block 5, buffer storage 6, first switch 7, indicator 8 of the first free cell (buffer "auxiliary battery"), error control unit 9 approximation, the second switch 10, and the indicator-11 of the first occupied cell (buffer storage).

The device operates in cycles corresponding to the moments of arrival of digital samples of the measuring signals at its input 1.

In each cycle, the input of the data storage block 2 of the control values of the measuring signals is counted from some i-ro measuring signal. When a measurement signal is received by the generator 3, the number of the data source in block 2 contains the address at which the list of control values of the signals is stored, which relates to the i-th measuring sipnal. The measurement signal and the list of control values are transmitted to the tabulator 4. In this case, the list of reference values may be corrected. The tabulator 4 calculates the new coefficients of the polynomial approximating the gth signal at the current approximation interval (or other characteristics of the approximating function) using the surplus list of control values.

Using the generator 3, the data source number in block 5 of cell address addresses is the cell address of the buffer accumulator 6, which contains a set of variable polynomial coefficients related to the i-th measurement signal. This address is connected to the switch input 7 addresses and 5 information. The address from the indicator 8 of the first free cell of the buffer accumulator is connected to the other input of the switch 7. The choice of the switchable address depends on the signal from the control / error block 9 of the approximation procedure. Block 9, by comparing the values of the approximate polynomial with the control values of the i-th signal, estimates the error of the approximation. If this error does not exceed some given value, the output of block 9 is a signal which, using the first switch 7 and information, connects to the address: inputs of the buffer accumulator b the address of the set of variable polynomial coefficients 0 i. mu measurement signal 1C output unit 5.

In addition, using the second switch 10 of the addresses and information to the information inputs 1M of the buffer accumulator 6, the outputs of the tabulator 4 are turned on. Thus, if the approximation error is not more than a certain specified value, then a new set of polynomial coefficients will be written to the corresponding cell of the buffer accumulator 6 related to the i-th measuring signal. If the approximation accuracy exceeds the specified value, the signal from the output of block 9 using switches 7 and 10 records the initial 5 Å approximation (always equal to the i-ro signal itself); to the first free one. cell buffer buffer. After that, a new content is recorded in block 5 of the cell address — a new address for the –th set of variable polynomial coefficients, equal to the content of the indicator 8 of the first free cell of the buffer accumulator. Then the value of the indicator 8 of the first free cell of the buffer storage is increased by 5 per unit.

In the next cycle, the described operation is repeated for the (i + l) -ro measuring signal. Data from the buffer accumulator 6 is fed to the transmitter at a fixed rate. This speed can be either higher or lower than the rate at which data is input to the device, since each cell contains a set of polynomial coefficients, the 1HP of which the approximated process restores with a given accuracy, and the cells only reserved for recording coefficients, are missing. Each time data is output from the memory cell of the buffer accumulator 6, the address 0 of which is equal to the value of the indicator 11 of the first occupied cell of the buffer accumulator, after which the value is increased by one. If the read speed is faster than the write speed, then to ensure multiple reads after the completion of the read cycle