SU1030752A1 - Device for recording seismic signals on magnetic tape - Google Patents

Description

(the second output of the analysis circuit is connected (to the first input of the third element 1IL or to the first input of the count counter; Space of differences, the second input to; which is connected to the second output of the first memory device, the third output of which is connected to the input of the sample counting counter, output of the channel counter connected to the input of the first memory device and to the first input of the eleventh element AND, the input of the channel counter is connected to the input of the channel switch and to the corresponding output of the control unit EXT of the second element OR connected to the second to the inputs of the ninth, tenth, and eleventh And elements, and to the input of an additional element of delay, the output of which is connected to the second input of the fifth And element, the Third

the input of the counter of the number of differences and to the second input of the third element OR, the output of which is connected to the input of the delay element, the output of which is connected to the second inputs of the sixth, seventh and eighth elements AND, the outputs of the ninth, tenth and eleventh elements AND are connected to the inputs of the third storage device , the output of which is connected to the input of the formatter, the first output of which is connected to the input of the digital magnetic recorder, the output of which is connected to; The first input of the second converter has a CBD analog, the second input of which is connected to the second output of the formatter, the outputs of the control unit are connected to the control inputs of the formatter and the digital magnetic recorder, the output of which is connected to the input of the control unit.

The invention relates to a seismic survey technique and can be used for digital recording of amine; their signals to magnetic tapes under field conditions.,

A device for digital recording of seismic information is known, which contains a block of seismic amplifiers, a software key, an instantaneous automatic gain controller, a level lock, a reference circuit, a reference level trigger device, a control pulse generator, a reproducing device, a light indicator, a digital magnetic recorder, an electronic a computer, a key, a code-to-analog converter and an oscilloscope. one,

A disadvantage of the known device is that in it readout seismic signals are recorded in the form of twelve-bit binary codes that contain significant redundancy with

The closest in technical essence to the present invention is a seismic recording device. signals to a magnetic tape containing seismic amplifiers, a first memory device, a counting counter, a first code-to-analog converter, the output of which is connected to the first input of the comparison circuit, the outputs of which are connected to the first inputs of the first, second and third elements And, the fourth element And ,, pulse generator, incremental block fifth element And, the second storage device, the first input of which

connected to the first output of the first storage device, the sixth, seventh and eighth cells, the outputs of which are connected to the inputs of the first storage device, the first input of the eighth element I is connected to the counter of counts and the input of the first converter-analogue, delay element, the ninth, dec The eleventh and eleventh And elements, the third storage device of the control input of which is connected to the corresponding output of the control unit, a digital magnetic recorder, a second converter code, the outputs of which are under They are connected to the inputs of the G2 oscilloscope.

The drawback of the device is that the seismic information recorded on the tape contains significant redundancy.

In general terms, seismic signals are mechanical vibrations of the earth’s surface, which are sensed by seismic receivers and converted into electrical signals. It is known that the nature of inertial objects is such that for them for a short time interval, sharp abrupt mechanical vibrations do not occur. As a rule, the values of the signals corresponding to these oscillations over time either increase uniformly or evenly decrease. In this connection, as shown by the results of the analysis of seismic signals, the difference in neighboring samples, despite its increase or decrease in time. For a certain period of time remains constant. Therefore, during periods of increased seismic signal, a plurality of consecutive identical positive increments are obtained, and when the seismic signal is reduced, a plurality of identical negative consecutive increments are obtained. During periods of time when the seismic signal does not change, a set of Gpdp zeros are obtained. Naturally, registering all the increments of the same increments practically means registering redundant information. The aim of the invention is to increase the information content of the recorded information. The goal is achieved. The device for recording seismic signals on magnetic tapes containing seismic amplifiers, the first memory device, a count counter, the first code-analog converter, the output of which is connected to the first circuit input. Comparison, the outputs of which are connected to the first inputs I will give the first, second and third elements And, the fourth element And, the generator of pulses, the increment block, the five element And, the second storage device, the first input of which is connected to the first output of the first record the sixth, seventh and eighth elements AND whose outputs are connected to the inputs of the first storage device, the first input of the eighth element AND is connected to the output of the counter of counts and to the input of the first converter code-analogue, delay element, the ninth, -des the first and the first elements And, the third storage device, the control input of which is connected to the corresponding output of the control unit, a digital magnetic recorder, the second code-analog converter, the outputs of which are connected to the inputs of the oscilloscope, In addition, a channel switch, a channel counter, a trigger, the first element OR, cxeiMa analog, a counter for the number of differences, the second and third elements OR, an additional delay element and a formatter are entered, the outputs of the seismic amplifiers are connected to the inputs of the channel switch, the output of which is connected to the second input of the comparison circuit, the second inputs of the first, second and third elements And are connected to the output of the fourth element And the first input of which is connected to the output of the pulse generator, the second input of the fourth element And by The key is connected to the single output of the trigger, whose single input is connected to the corresponding output of the control unit, the zero input of the trigger is connected to the control input of the analysis circuit and to the output of the second element AND, the output of the first element AND is connected to the first input of the first increment OR and to the subtraction input of the count counter, the input of which is connected to the output of the third element AND, the second sign input of the increment block and to the second input of the first element OR whose output is connected to the first element OR, the output of which is connected to the input of the increment block, the output of which is connected to the first input of the analysis circuit and the first input of the fifth AND element, the output of which is connected to the second input of the second storage device whose output is connected to the first input of the sixth And element, the input of the tenth element And to the second input of the analysis scheme, the first output of which is connected to the first input of the second element OR, the second input of which is connected to the first output of the counter. the number of differences, the second output of which The second is connected to the first input of the seventh element AND and the first input of the ninth element I, the second output of the analysis circuit. We connected to the first input of the third element 1LI and to the first input of the counter of the number of differences, the second input of which is connected to the second output of the first storage device, - the third output of which is connected to the input of the counting counter, the output of the channel counter is connected to the input of the first storage device and to the first input of the eleventh element AND, the input of the channel counter is connected to the input of the channel switch and to the corresponding 5y output of the control unit, the output of the second element OR is connected to the second inputs of the ninth, tenth, and eleventh AND elements and to the input of an additional delay element whose output is connected to the second input of the fifth And element, the third input of the counter of the number of differences and the second the input of the third element OR, the output of which is connected to the input of the delay element, the output of which is connected to the second inputs of the sixth, seventh and eighth elements AND, the outputs of the ninth, tenth and eleventh elements | are connected; to the inputs of the third storage device, the output of which is connected to the input of the formatter, the first output of which is connected to the input of the digital magnetic recorder, the output of which is connected to the nepaoMS input of the second code-analog converter, the second input of which is connected to the second output of the formatter It is necessary for formatter and digital magnetic recorder, the output of which is connected to the input of the control unit. The drawing shows a block diagram of a device for recording seismic signals onto a magnetic tape. A device for recording seismic signals on a magnetic one contains 1.1-1.N.N seismic channels, 2.1-2.N seismic amplifiers, a 3-channel commulator, a 4-channel counter, the first storage device 5, a count counter b, the first code-analog converter 7, comparison circuit 8, first, second, third and fourth elements AND 9-12, pulse generator 13, trigger 14, first element OR 15, increment unit 16, fifth element AND 17, second storage device 18, analysis circuit 19, counter 20 the number of differences, the second and third elements OR 21 and 22, above stand, seventh and eighth elements And 23-25, additional delay element 26, delay element 27, ninth, tenth and eleventh elements And 28-30, third storage device 31, formatter 32, digital magnetic recorder 33, second code converter analog 34, oscilloscope 35 and control block 36. A device for recording seismic signals on a magnetic tape operates as follows. The signals generated by the seismic detectors and from the input seismic channels 1.1-1.N in the form of continuous (analog) voltages are fed to the inputs of seismic amplifiers 2, l-2.iN from the outputs of which are fed to the KOMrviy 3 channels. According to the signal from control unit 36 supplied to the input of the 3-channel switch, the latter supplies the seismic signal of the first seismic receiver to the input of the comparison circuit 8. The same signal from the control unit 36 records a unit in the 4-channel counter, i.e. code of the first seismic receiver number “Since the device’s operation in all addresses is memorized at the beginning, its devices 5 are zeros, then the signal from the 4-channel counter from the first address of the storage device 5 to the counter 6. memory 18 is received zeros. On a signal from control unit 36, trigger 14 is set to one state, element 12 is opened. In diagram 8 s, the zero-to-zero comparison is compared with the seismic signal of the first seismic receiver. Since the value of the seismic signal. is greater than zero, then at the third output of the comparison circuit 8, a signal is received that opens element 11 and the signals from the pulse generator 13 begin to pass through the open elements 12 and 11 to the input of the counting counter 6 samples, which begins to count. With the arrival of each of these pulses, the contents of the 6 count counter are incremented by one. Due to this, at the output of the code-analogue converter 7, a linear-step rising voltage is obtained, the height of each step that is equal to the low-order weight of the counter is 6 samples. At the same time, the signals from the element output; I11, arriving at the sign input of the block 16 increments, fix a positive sign and, entering the counting input through the element OR 15, accumulate in this block. This process continues until the value of the seismic signal of the first seismic receiver with the value of the voltage at the output of the code-analogue converter is equal to 7. In mno-. The equality of the indicated voltages at the second output of the comparison circuit 8 produces a signal that opens the element 10 and stops the flow of pulses to the input of the addition of the counter of 6 samples and to the inputs of the increment block 16. The content of the 6 count counter and the increment block 16 is the digital equivalent of the seismic signal readout of the first seismic receiver. The next pulse generator signal 13 through the open element enters the control input of the analysis circuit 19 and simultaneously sets the trigger 14 to the zero position, closing the And 12 and stop, and the passage of the signal generator 13 pulses through this element. The signal from the output of the And 10 element by the analysis circuit 1.9 compares the digital equivalent of the reference of the seismic signal of the first seismic receiver to zero. The inequality signal from the output of the analysis circuit 19, the passage through the OR element 21, opens the elements AND 28-30 and writes to the storage device 31 from the counter 20 the number of differences and the storage device 18 zeros, and from the counter of channels 4 - one, i.e. code number of the first geophone. The same recording signal, delayed by delay element 26, writes a unit to counter 20 of the number of differences, opens element 17 and rewrites the digital equivalent of the seismic signal of the first seismic receiver from the output of increment block 16 to memory 18. Signal from the output of delay element 26 , the passage through the OR element 22 is delayed on the delay element 27, opens the AND 23-25 elements and records the digital equivalent of the seismic signal of the first seismic receiver coming from the memory devices. and 18 and the counter b are counts and the unit coming from the counter 20 of the number of differences into the memory 5 at the first address. Then, the signal from the control unit 36 supplied to the input of the switch 3 channels, the latter supplies to the input of the comparison circuit 8 a seismic signal of the second seismic receiver. Next, the device works similarly to that described before the end of the first cycle of seismic signal conversion of all seismic receivers. At the beginning of the second cycle, from the netBor address of the storage device 5, the digital equivalent of the reference of the first seismic signal of the first cycle is entered into the counter b of counts and in the storage device 18, and one is taken into account 20 of the number of differences. In this case, at the output of the converter, the analogue code 7 forms a voltage level corresponding to the reading of the first seismic signal of the first cycle. In comparison diagram 8, the first seismic signal of the first cycle is compared with the first signal of the second cycle. If the count of the first seismic signal of the second cycle is greater than the count of the first signal of the first cycle, then the third output of the comparison circuit 8 produces a signal that opens the element 11 and 11 and the generator signals 13 pulses through the open element 12 and 11 to the input of the counting counter b of samples. At the output of the converter, the code analog 7 from the voltage level corresponding to the readout of the first signal of the first cycle, a linear-step rising voltage is formed. At the same time, the signals from the output of the AND 11 element, arriving at the sign input of the block 16 increments, fix a positive sign, and, entering its counting input through the element OR 15, accumulate in this block. If the count value of the first seismic signal of the second cycle is less than the count value of the first signal of the first cycle, then at the first output of the comparison circuit 8, you get a signal that opens element 9 and pulse generator 13 signals through open elements 12 and 9 to the subtraction input of count 6, With the arrival of each of these pulses, the contents of the count counter b are decremented by one. Due to this, at the output of the converter code-analog 7 from the voltage level, corresponding to the reading of the first one of the first cycle, a linear-step decreasing voltage is formed. At the same time, the signals from the output of the element 9, arriving at the sign input of the increment block 16, fix a negative sign and, arriving at its counting input through the element 15, accumulate in this block. the converter, code-analog 7 at the second output of the comparison circuit 8, a signal is obtained that opens the element and 10 and stops the flow of pulses from the generator 13 to the addition or subtraction input of the count b and counting and to the inputs of the increment block 16. The content of the count counter b is the digital equivalent of the count of the first seismic signal of the second cycle, and in block 16 of increment the sign and the difference values of the counts of the first signal of the second and first cycles are found. The signal from the output of the element AND 10 by the analysis circuit 19 compares the difference in samples of the first signal with the digital equivalent of the reference of the first signal of the first cycle. The inequality signal from the cxeMii 19 output of the analysis, the passage through the OR 21 element, opens elements 28-28 and writes down to the memory 31 from the counter 20 the number of differences one, from the memory 18 is the digital equivalent of the first signal count, the first cycle, 4 channels -. Unit, i.e. code number of the first seismic signal. The same recording signal, delayed on delay element 26, writes one to counter 20 of the number of differences, opens element 17 and rewrites the sign and value of the difference of samples of the first signal from the output of increment block 16 to memory 18. The signal from the output of delay 26 the passage through the element OR 22, is delayed on the element 27 of the delay, opens the elements AND 23-25 and records the sign and the value of the difference of the samples of the first signal received from the storage device 18, the unit coming from the counter 20. a-connectivity, and digital ekviva.pent first frame of the second cycle of the signal coming from the counter 6 counts in the memory 5 to the first address. Then, the signal from control unit 36 supplied to the input of the channel switch 3, the latter supplies the second seismic signal to the input of the comparison circuit 8. Further, the device operates similarly to that described before the end of the second cycle of the conversion of all seismic signals.

At the beginning of the k-th cycle, from the first address of the storage device 5, the digital equivalent of t of the readout of the first signal of the (k-1) -th cycle is entered into the counter of 6 readings, the sign and values of the readings of the readings of the first signal obtained in recording. into a memory device 18, the number of equal incremental differences obtained in (the cycle is fed into the counter 20 of the number of differences) At the output of the code-analog converter 7, the voltage level corresponding to the first signal count is obtained: a (k-1) - In comparison circuit 8, the first signal of the (k-1) th cycle is compared with the first signal of the k-g Cycle, If the first signal of the k-th cycle is larger than the first Signal 1k-1) -th cycle , then at the output of the comparison circuit 8, a signal is obtained that opens an element. Mei-iT И 11, л-г (pulses from generator 13 pass through open elements and 12 and 11 to the addition input of a counter of 6 counts. At the same time, at the output of the converter, code-analog 7 from the voltage level corresponds to the first signal reading ( k-1) -th cycle, a linearly stepped voltage is obtained.If the countdown of the first signal of the k-th cycle is less than the countdown of the first signal fK-D-ro cycle, then the first output of the comparison circuit 8 is a signal that opens the AND 9 element and the pulses of the generator 13 are passed through the open cells to the input of the subtract account I

Chika 6 counts. At the same time, at the output of the converter, the code-analog 7 from the voltage level corresponding to the timing of the first signal (k-1) -th, forms a linear-stepwise decreasing stress, At the moment of equality of the counting of the first signal of the k-th cycle with a voltage value at the output of the converter, the code-analogue 7, the contents of the 6-sample counter represent the digital equivalent of the first signal of the k-th cycle, and in block 16 of increment the sign and value of the difference of samples of the first signal of the k-th and (k-1) th cycle, the output signal of the element | ta And 10 schemes 19 minutes analysis comparing the difference produced samples of the first signal received in k th cycle, with the difference obtained in {k - 1) th cycle. If the difference obtained in the kth cycle is not equal to the difference obtained in the (5 (-1) -th cycle, to the inequality signal from the output of the analysis circuit 19, the passage through the OR 21 element opens the AND elements and writes to the memory 31 the number Others going the same way.

differences coming from the counter 20 of the number of differences, the sign and value of the difference (k-1) -th cycle, stepping from the storage device 18, and one, (Ie the code of the number of the first signal coming from the counter

4 channels. A similar recording of the contents of the 4-channel counter, the storage device 18 and the counter 20 of the number of differences to the storage device 31 is also carried out with the full filling of the counter 20 of the number of differences. The same recording signal, which is delayed on delay element 26, writes a unit to counter 20 of the number of differences, opens element 17 and rewrites the sign and difference of the k-th cycle from increment block 16 to memory 18. Signals from the output of delay element 26, the passage through element 22, is held on delay element 27, opens elements H-23-25 and records the sign and value of the difference c-r6 of the cycle coming from memory 18, the unit coming from counter 20 of the number of differences, and the digital equivalent of the reference per th signal k th cycle, coming from the counter 6 counts in the memory 5 for the first direc ..su. If the difference / obtained in the kth cycle is equal to the difference obtained in the (k-1) -th cycle, then the equality signal from the output of the analysis circuit 19 increases by one the contents of the counter 20, the number of differences, and passing through the OR 22 element is delayed on the element 27 delay, opens the elements And 23-25 and writes in the first address of the storage device

The 5 sign and the difference value of the k-th cycle is the new number of sequences of the same differences going on. And digital is equivalent to the count of the first signal of the k-th cycle. After recording in the first address of the storage device 5 new information

The signal from control unit 36, which is supplied to the input of the 3-channel switch, the latter supplies the second seismic signal to the input of the comparison circuit B. Next, the device works as described globally.

The memory 31 has a storage capacity sufficient to accumulate information during recording intervals. When the signal control unit 36 is fed to the input from the digital magnetic recorder 33 about the readiness of the latter for registration, the control unit 36 sends signals to the storage device 31, the formatter 32 and the digital magnetic recorder 33, the formatter 32 sends the generated codes from the control unit 36 to

device 31 to a digital magnetic recorder 33.

It is seen that in the process of its device in periods of time when it is significant. Neither the differences between the adjacent samples of the seismic signals are the same, they are not recorded, i.e. during those periods of time when seismic signals do not change or change at the same rate, recording is not performed. In practice, 70–80% of the time change of seismic signals is of a specified nature, and therefore 70–80% of samples are virtually blunted, i.e. they are not needed to restore the original signal from the converted digital values. It is precisely because of this, in the proposed device, it is sufficient to make registration only at those moments when the difference value of the neighboring seismic readings changes.

signals. In this case, it is necessary to register only the numbers of the children of the same differences, the sign and the value of the difference and the number of the seismo receiver. Due to this, the total amount of recorded information is reduced by 4–5 times due to the elimination of an excessive number of samples. As a consequence, it is possible to use compact tape drives to build compact portable seismic devices as recorders instead of bulky high-capacity tape drives.

Registrars that, on the one hand, require less manufacturing costs compared to the known device; on the other hand, they do not pipe special vehicles and. staff, which leads to a significant reduction in the cost of their operation.

Claims (1)

(56) A DEVICE FOR RECORDING SEISMIC SIGNALS TO A MAGNETIC TAPE, containing seismic amplifiers, a first storage device, a counter, a first code-analog converter, the output of which is connected to the first input of the comparison circuit, the outputs of which are connected to the first inputs of the first, second and third elements And, fourth element And, pulse generator, block> increments, fifth element And, second storage device, the first input of which is connected to the first output of the first storage device, sixth, seventh and eighth elements And, the outputs of which are connected to the inputs of the first storage device, the first input of the eighth element And is connected to the output of the counter and to the input of the first converter, the analog code, the delay element, the ninth, tenth and eleventh elements And, the third storage device, the control input of which is connected to the corresponding output of the control unit, a digital magnetic recorder, a second code-analog converter, the outputs of which are connected to the inputs of the oscilloscope, distinguished by the fact that, in order to increase the information content of the the information to be verified, the channel switch, the channel counter, the trigger, the first OR element, the analysis circuit, the difference number counter, the second and third OR elements, the additional delay element and the formatter are additionally inserted, and the outputs of the seismic amplifiers are connected to the inputs of the channel switch, the output of which connected to the second input of the comparison circuit, the second inputs of the first, second and third elements And are connected to the output of the fourth element And, the first input of which is connected to the output of the pulse generator, the second input q of the fourth element And is connected to the unit output of the trigger I ger, a single input of which is connected to the corresponding output of the control unit, the zero input of the trigger is connected to the control input of the analysis circuit and to the output of the second element And, i the output of the first element And is connected to the first input of the first element OR,, the first sign input of the block pri- | and to the input of the subtraction counter | samples, whose addition input keys under-j to the output of the third AND gate, a second input to the sign of the increment block and to the second input of the first ^element; OR, whose output is connected I to the input of the increment block, the output of which is connected to the first input of the analysis circuit and the first input of the fifth AND element, whose output is connected to the second input of the second storage device, the output of which is connected? to the first input of the sixth element And, | the first input of the tenth element And sz ® and to the second input of the analysis circuit, the first output of which is connected to the first input of the second OR element, the second input of which is connected to the first output of the counter of the number of differences, the second output of which is connected to the first input of the seventh element And the first input of the ninth element AND, 103075? 'the second output of the analysis circuit is connected to the first input of the third element 1 OR and to the first input of the counter of the number of differences, the second input of which is connected to the second output of the first storage device, the third output of which is connected to the input of the sample counter, the output of the channel counter is connected to the input of the first storage device and to the first input of the eleventh AND element, the input of the channel counter is connected to the input of the channel switch and to the corresponding output of the control unit. The output of the second OR element is connected to the second odes of the ninth, tenth and eleventh AND elements and to the input of the additional delay element, the output of which is connected to the second input of the fifth AND element, to the third input of the difference number counter and to the second input of the third OR element, the output of which is connected to the input of the delay element, the output of which is connected to the second inputs of the sixth, seventh and eighth elements And, the outputs of the ninth, tenth and eleventh elements And are connected to the inputs of the third storage device,. the output of which is connected to the input of the formatter, the first output of which is connected to the input of the digital magnetic recorder, the output of which is connected to; the first input of the second conversion is a code-analog, the second input of which is connected to the second output of the formatter, the outputs of the control unit are connected to the equalizing inputs of the formatter and the digital magnetic recorder, the output of which is connected to the input of the control unit.