SU750538A1 - Adaptive address device - Google Patents

Description

one

The invention relates to telemetry and can be used in devices where data compression is required.

A device for compressing data, comprising a clock pulse generator, an e-3111-e block, a control unit, a buffer storage unit, an indicator 1, is known.

The device has limited functionality.

The closest to the proposed technical entity is an adaptive addressing device containing the current sample register, whose input is connected to the device input, the output register of the current sample and the output of the RAM block are connected to the inputs of the arithmetic blockade whose first three outputs are connected: respectively to the first inputs OR elements and with the first INPUT: the register of control values, the second input of which is connected to the output of the first element OR, the output of the register of control values is connected to the first the course of the RAM block, the second input of which is connected to the output of the .fiTODoro element OR, the first output

a clock generator is connected to the input of a delay element, a buffer memory accumulator, an And element, a buffer e-memory block, a read address counter, a write signal generator, a control unit, a write address counter 2.

. However, the following disadvantages could not be avoided in this device: the addressing method is only acceptable for telemetry systems with high compression ratios; the impossibility of obtaining sufficiently high integral coefficients of compression, which arise due to the fact that when reducing the redundancy of telemetry data, the number of active channels. (sensors) varies from frame to frame,

20 and this leads to the appearance of redundancy in the address: information.

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

The goal is achieved

25 in that a device for determining the personnel coefficient of compression, a block of decision makers, a gap coding generator, a generator of a separate address,

Claims (2)

30 address switch, common address generator and address register, whose input is connected to the second clock generator output, wedge register outputs, respectively, through the common address generator, through the separate address generator, and through the gap coding generator, are connected to the first three inputs of the address switch, the output of which is connected to the first input of the AND element and the first input of the buffer storage unit, the second input of which is connected to the output of the AND element, the second inputs of the OR elements are connected respectively to you Odom and the first delay element in the course of the clock generator, four fifth output of the arithmetic unit via the drive buffer memory connected to the second input of AND gate and input of the compression ratio determining unit frame, the output of which through a decision block connected to the fourth input of switching unit addresses. The operation of the proposed device is based on the principle of switching address generators in accordance with the quality indicator of the adaptive telemetry system. This quality indicator selects the personnel compression factor: act (1) the number of sensors (channels) in the source; the number of active sensors in the frame of the telemetry system. Most existing radio telemetry systems are based on the principle of the time division of NIN channels. Moreover, the addressing in them is carried out by transmitting the marker at the beginning of the treasure. FIG. 1 shows the block diagram of the proposed device; in fig. timing diagrams and graphs explaining the process of compressing measurement data. When the measurement data is compressed, the structure of the complete geometric frame changes (Fig. Next, the telemetry frame is condensed, i.e., the active channels follow one after the other in order to increase the channel numbers. If such data arrive on the receiving side, then they will not be decoded capabilities. Therefore, compressed data must be addressed ... Generally, three ways of addressing 1. A method of encoding a separate address. The essence of the method is that the address is assigned to the active channel. In this case, the telemetry frame appears As of Fig. 2 V. And the number of symbols Nj. spent on addressing compressed data is avno: N5. -noKT-Bog M, (2) de is the number of active channels in the frame, N. is the number of PTC channels, 8o6oN is the number characters (ones or zeros) required for addressing one sample or one channel 2. Method for coding gaps Method community - transferring instead of rejecting data on the number of this pass (FIG. 2 g). In this case, the number of characters N spent on addressing compressed data, is: M MM-Iakt) 2 (3) (N-rijjj i) is the number of gaps. 3. A method of forming a common address. The essence of the method is transmission at the beginning of the frame of the code group, where it corresponds to the active channel (Fig. 2 d). In this method, the number of characters spent on addressing the compressed data is: Fig. 2 e shows the dependencies of the number of characters spent on addressing for the three addressing methods depending on the code compression factor. It can be seen that with a decrease in the number of active channels, i.e. as K grows, / the number of characters per address when coding gaps increases, the number of characters at separate addressing decreases, and remains constant when forming a common address. Data analysis of FIG. 2 shows that the minimum number of characters required for addressing is possible when using the system at the same time three ways of addressing. Moreover, the address part of the system should produce an estimate of K, and in accordance with this assessment, switch address generators. Yoi remove the values of K., at which it is necessary to make switching address generators. From the consideration of dependencies Sfig. 2) it became apparent that the minimum number of characters per address-. day is obtained by operating the system in the shaded area. The boundaries are obtained from expressions (2) and (3) using expression (1) by substituting instead of the value N. We get: act-Ng "(" - aKTVCoggN From here we get the limit for Eod-Ni. Thus, if the measured Kj value has not reached The values Eo / EoggN-i, the coding of the gaps is used, if K is used for separate addressing, then it is within the limits, with the 2M-1 charger and Eogg N, the common address is formed from the top.The values Ko | 2N and g ° | || f - are known a priori, since the number of sensors in the RTS is determined by the design features of telemetry The systems. The definition of K is reduced to calculating the ratio N / Hgi fn, where N is the number of channels known a priori, and the calculation is PS (| K, is performed by a pulse counter. The device contains a register 1 of the current sample, the arithmetic unit 3 , element 4ILI, register 5 of control values, element b OR, accumulator 7 b of fern memory, block 8 for determining the compression factor, block 9, making decision, block 10 for switching addresses, general address generator 11, generator 12 for separate addresses, generator 13 coding of skips, buffer memory conductive block 14, timing generator 15, a delay element 16, a register 17 addresses member 18 VI device operates as follows. Binary codes of measured parameters (sample) are received at equal intervals on register 1 of the current sample. From the output of register 1, the current sample is fed to the first input of the arithmetic unit 2, to the second input of block 2, the control values are received from block 3 of the RAM. From the control values and the value of the current sample, the arithmetic unit 2 determines the function approximating the measured process. With the appearance of significant samples, a single signal appears at the first output of the arithmetic unit 2. It passes element 6 AND and is fed to the first input of the register of 5 control values. In this case, in register 5, the control values corresponding to the beginning of the new approximation interval are set. Then, the arithmetic unit 2 outputs at its third output a recording resolution pulse, which, having passed element 4 OR, is fed to the input of the RAM block 3. At the same time, control values are recorded from the Registrar 5 to the corresponding cell of the RAM block 3 to begin a new approximation interval. If, with an oversampling, the control values need to be corrected, then at the first output of the arithmetic unit 2 a code appears that is transmitted to the register 5 of the control values. Then, at the third output, a pulse is formed, which records the corrected values of the control values from the register 5 into the corresponding cell of the operational memory 3. In addition, at the second output of the arithmetic unit 2, in any case, codes of control parameters appear that describe the function that most optimally approximates the measurement process. These codes are recorded in buffer storage 7. A clock generator 15 is designed to synchronize the operation of the device. Pulses from the first output of the generator 15 are fed to the second input of element 4 OR, and through delay element 16 to the second input of element 6 OR. These pulses control the operation of register 5 of control values and block 3 of operational data in the case of coincidence in the value of current sampling rates and control magnitude. The compressed data from accumulator 7 is fed to the input of block 8 for determining the personnel compression factor in which the operation is performed. Depending on the magnitude of the personnel compression ratio, the decision block 9 performs a comparison operation of Kezh with the values of EogjVn .j values set a priori and controls the operation of the address switch 10, the address generation occurs in the separate address generators 12, the total address 11 and the coding gaps 13 The selected address is fed to the buffer storage unit 14 and controls the operation of the element 18 I. To synchronize the operation of the device, the clock pulses from the clock generator 15 through the address register 17 are fed respectively to ode address generator. Thus, at the output of the buffer storage unit 14, we have a transformed signal of measured parameters, by counting which the address is optimally assigned. The application of the invention improves the efficiency of telemetry systems, since the number of characters required to address compressed data is reduced. Claims of the invention: An adaptive addressing device comprising a current sample register, the input of which is connected to the device input, the output of the current sample register and the output of the RAM block are connected to the inputs of the arithmetic unit, the first three outputs of which are connected respectively to the first inputs of the OR elements and to the first input of the register of control variables, the second input of which is connected to the output of the first element OR, the output of the register of control values is connected to the first input of the RAM unit, the second input of which is connected to the output of the second element OR, the first output of the clock generator is connected to the input of the Delay Element, the buffer memory accumulator, the I element, the buffer e-memo block, characterized in that, in order to increase the information content of the device by increasing the compression ratio, a frame compression ratio determining block, a skip coding generator, a separate address generator, an address switch, a shared address generator and an address register, whose input is connected to the second clock generator output the outputs of the address register, respectively, through the generator of the common address, through the generator of the separate address and through the coding generator skip j OB are connected to the first three inputs of the address switch, the output of which is connected to the first input of the terminal I and the first input of the buffer storage unit, the second input of which is connected to the output of the element I the second inputs of the OR elements are connected respectively with the output of the delay element and the first output of the clock generator, the fourth output of the arithmetic unit through the buffer buffer drive m tee is connected to the second input of AND gate and input blokaopredeleni human compression ratio, the output of which through a decision block connected to the fourth input of switching unit addresses. Sources of information taken into account in the examination 1, Aerospace telemetry. Ed., Trofimova K.N., M, 1968, p. 199-207. 2. USSR author's certificate No. 56717.4, cl. G 08 C 15/00, 05.01.76 (prototype). P / L X v h I  nfvnycKob / f 3; r (e addresses bg Y1S U