SU615439A1 - Device for on-line processing of seismic information - Google Patents

Description

(54) DEVICE FOR PROCESSING SEISMIC TIME OF INFORMATION TIME IN REAL inputs of digital-analog multiplier. The output of the code-analog converter is connected to the second input of the multiplier, and its output is connected to the integrator input. The control inputs of all units are connected to the output of the control unit. The reference and seismic signals from digital information sources through the input block are fed to the corresponding inputs of the PSA. After loading both OZB, the device automatically switches to the processing mode, during each cycle of which equal to the time interval for the arrival of information via the seismic channel; conversion of all samples of the reference channel from digital to analog using a converter (L code-analogue; digital-analog multiplication of the transformed information of the reference channel with digital seismic information; analog integration of the multiplication results, forming at the output of the integrator the value of the mutual correlation function corresponding to this value argument The main drawback of the device type is the large capacity of the PSA, which, in addition to the duration of the realization of the reference signal (number The N) samples are determined by the dynamic range of the processed signals and, consequently, by the size of their representation, taking into account that the most acceptable form of the AHD in the device is according to the correlation algorithm, the shift registers and their degree of integration the time is short, the significant effect of the capacity of the PSA on the weight of the barometric and energy performance of the device as a whole becomes evident, especially when it comes to a multi-channel device performing simultaneous parallel processing and Several seismic traces (usually 12 or 24) The aim of the invention is to reduce the capacitance of the ES and increase the reliability of the device. This is achieved by introducing a digital sample converter, included between the output of the input unit and the seismic channel OZB input, and a decoder, connected between the seismic channel OZB output and the input multiplier; . The introduction of a digital sample converter makes it possible, with a certain algorithm of its operation, to reduce the frequency of digital sample codes of a seismic channel with virtually no narrowing of the dynamic range of workable and output signals of reduced processing accuracy. In my eyes

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Claims (3)

, .... J, radiah, reducing the length of the codes leads to a reduction in the capacity of the HSE required to store them with the same number of samples M. FIG. 1 shows a block diagram of the proposed device; in fig. 2 is one of the possible block diagrams of a digital sample converter. The device consists of an input unit 1, random access memory units 2 and 3, a multiplier 4, an integrator 5, a converter b, digital samples, a decoder 7, a control unit 8. The input unit 1 is connected to the inputs to the sources of digital information of the reference and seismic channels. One of the outputs of block 1 is connected to the input of the reference channel 2 OZV, and the second output is connected to the input of the converter 6 digital samples. The output of the converter 6 digital samples is connected to the} {ode seismic channel 3. The output of the latter is connected to the input of the decoder 7, the output of which is connected to one of the inputs of the multiplier 4. The second input of the multiplier 4 is connected to the output of the OZB reference channel 2. The output of the transmitter is connected to the input an integrator 5, the output of which forms a mutually correlation function. The control inputs of all units 1-7 are connected to the output of control unit 8. The device works as follows. The reference signal from the source of information through the input unit 1 is fed to the OZB2 input, and the seismic signal to the input of the digital sample converter 6 and further, in a transformed form, to the output of the OZB 3. ,, After loading both OZB, the device automatically goes to processing mode, processing, during each cycle of which is equal to the time interval; The information is received via the seismic channel, the digital information of the seismic channel is decrypted in the decoder 7; a mix of reference channel and seismic information; summation of the results of multiplication in integrator 5, forming at its output a count of the mutual correlation function corresponding to the given value of the argument. One of the design features of the proposed device is a digital sample converter b. It consists of an adder 9, a register 10 of the corrected readout of logic circuit 11 and an encoder 12. The input of the digital sample converter is the first input of the adder 9. The input for correcting the contents of register 10 is connected to the first output of the analysis logic circuit 11. The output of register 10 is connected to the input of the logic circuit 11 and the second input of the adder 9. The second input of the adder 9 (the X | (pT sign) is directly connected with the output of the sample converter. And BT, the output of the logic circuit 11 is connected with the input of the encoder 12, the output of which is the second output of the digital sample converter itself. The digital sample converter operates as follows: 1. The received next sample is added on the adder 9 with the remainder of the previous sample, and the binary code of the absolute amount of the sum is analyzed by logic, circuit 11, In the process, the first unit is written in the code when viewing the number from the left to the right, i.e., from the higher order bits to the younger ones. The sum sign is directly transmitted to the output of the digital sample converter. 2. If the unit is found in the ith bit (KciS + 2), tp in the presence of a unit in the next (i + 1th) bit, the logic circuit 11 gives a number consisting of zeros in all bits except (i -1) where it will be written (the zero bit has a weight of 2 °). In this case, all bits from the 1st to (1-1) -th, inclusive, i.e. those to the left of the bit from the first are thrown in. The number thus obtained is the remainder in the modified additional code; zero bit becomes a sign of the remainder of the reference. 3.If one is found in I-TOM bit, but (t + l) oM is written O, then logic circuit 11 has a number consisting of all zeros, except for the 1st bit, where it will be written. Thereafter, the i-th register bit 10 is reset to. The number obtained in it is the remainder of the reference. 4. If all bits within the first (S + 2) samples are equal to 0, the analysis circuit also gives out all bits, and the sample itself is the remainder for the next sample. 5. Any remainder of the previous sample is transferred to adder 9, where it is algebraically summarized to the next sample, which is received at the input of the converter, of digital samples. 6. The output number containing no more than one unit is encrypted by the encoder 12 into a code of shorter length than the original digital samples. It should be noted that the technical implementation of the proposed device, in particular for the rapid processing of vibroseis records on 12 tracks by correlating them with the reference signal The digital sample converter 6 is used only one due to the fact that it operates in multiplex mode in parallel for 12 (13) channels (including the reference one). It will also reduce the equipment costs per route. Claims An apparatus for real-time seismic information processing, comprising an input unit, operational storage blocks of the reference and seismic channels, a multiplier, an integrator, a control unit | , in order to reduce the capacity of the operative storage units and increase the reliability of the device / a digital sample converter and a decoder are introduced in it, the input of the digital sample converter connected to the output of the seismic channel of the input unit and the output to the input of the operational storage unit and the input the decoder is connected to the output of the operational storage unit of the seismic channel, and the output of the decoder to the input of the multiplier. Sources of information taken into account in the examination: 1. The brochure of the company ClUAteectroteeffnicaC Labs, Houston -Texas ETU / DC-i OO. 2. USA Prospect Iececrotectinicae Labs, Houston-Te xa 5tTb -Modef 24oo. 3. The prospectus of Reac Time TecfinoEog-j, M W - H02. (PT)