SU989501A1 - Multi-channel device for recording seismic signals to magnetic tape - Google Patents

Description

The invention relates to a measurement technique and can be used for digital recording of seismic signals onto a magnetic tape for subsequent input into an electronic computer.

A device for recording frequency-modulated seismic information is known, containing seismic receivers, amplifiers, modulators, magnetic heads, demodulators, calculator, oscilloscope.

The disadvantage of the device is that without the subsequent conversion of seismic information recorded on a magnetic tape in analog form, it is impossible to enter it into an electronic computer.

Closest to the invention is a device for digital recording of seismic information, comprising a block of seismic amplifiers, a comparison circuit, a storage device (memory), a control pulse generator, a software key, a code converter — an analog connected to an oscilloscope.

key, digital magnetic recorder L2J.

A disadvantage of the known device is that it performs sequential conversion of seismic signals into a digital code, where the total conversion time increases proportionally with the increase in the number of input signals.

10 WHAT; on the one hand, it limits the number of seismic signals that can be recorded simultaneously; on the other hand, limits the range of frequency variation

15 sampling of input signals. In addition, this leads to a time shift between channels, contributing hardware error as a result of processing information g

20 and signal samples are recorded as 12-bit binary codes that contain significant redundancy.

The purpose of the invention is to reduce the time of registration and reduce the redundancy of information.

This goal is achieved by the fact that in a multichannel device for recording seismic signals on a magnetic tape containing

seismic amplifier unit, comparison circuit, storage device, control pulse generator, software key, converter code analog connected to an oscilloscope, key and digital magnetic recorder, pulse generator introduced, count counter, additional converter code analogs - 1 additional comparison circuits, where N is the number of registration channels, 2N logical elements And, two additional memories, a delay element, an increment block and a reversible counter, the generator input being impulse The coil is connected to the first output of the control unit, and the output is connected to the input of the count counter, the outputs of which are connected to the inputs of the additional converter. The code is an analogue whose output is connected to the first inputs of all N comparison circuits, to the second inputs of which the outputs of the seismic amplifier unit are connected, the outputs of all N comparison circuits are connected to the first inputs of the pairwise combined 2N logic elements And, to the second inputs of which are connected the outputs of two lower counts of the counting counter, the outputs of the 2N elements AND connected to the 2N input The main memory, to the control input of which the output of the delay element is connected, the input of which is connected to the overflow output of the counter of counts and to the first control input of the first additional storage device, to the second control input of which is connected the second output of the control unit, 2N outputs of the main The charger is connected to the 2N inputs of the first additional storage device, the output of the high bit of which is connected to the input of the lower bit, and the outputs of the two most significant bits are connected to the inputs of the block increment The 2N outputs of the first additional storage device are connected to the inputs 2N of the higher bits of the second additional storage device, to the first control input of which the third output of the control unit is connected, and to the second control input the output of the key whose input is connected to the fourth output of the control unit , the fifth output of which is connected to the control input of the increment unit, the outputs of which are connected to the inputs of two lower bits of the second additional memory device, the outputs of the two x MSBs of which are connected to the inputs of unit increments, while the remaining outputs are connected to inputs of a digital magnetic recorder and through software key - to the inputs

reverse counter, the outputs of which are connected to the inputs of the additional converter code - ai.alog.

The drawing shows a block diagram of the proposed device.

A device for recording seismic signals contains input channels 1-1, a block of seismic amplifiers 2, a pulse generator 3 | count counter 4, converter code - analog 5, outputs of seismic amplifier block 6 - 6y, comparison circuit 7 - TC, logic elements - .BN, memory device 9, additional memory | 5 memory devices 10 and 11, delay element 12, increment unit 13, control unit 14, nporpaMi-i key 15, reversible counter 16, converter code - analog 17, cyclograph 18, key 19, digital magnetic recorder 20.

The device works as follows.

At the beginning of the work, the output voltage of the control unit 14 is formed, which triggers the pulse generator 3. The pulses from the generator 3 are fed to the input of the twelve-digit counter of counts 4. With the arrival of each of these pulses, the contents of the counter 4 are increased by one. Due to this, at the output of the converter code, analogue 5 forms a stepwise voltage, the height of each step of which is equal to the weight of the younger discharge of counter 4. by increasing the content of counter 4 in comparison circuits 7-7, the specified step voltage is compared with all seismic signals that The outputs of the seismic amplifier unit are 6-6m.

Claims (2)

1. Fedorenko A.N. Magnetic seismic recording. M., Nedra, 1964j p. 98 2.Kunizikov BK, Kunizikova MK, General course of geophysical methods 5 intelligence. M., Nedra, 1976,0.291 {prototype}.