US3777308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for information playback in multichannel digital seismic recording system
Assignee: Individual
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Filing: 1972-07-06
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Granted: 1973-12-04
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Expires: 1992-07-06
Abstract
Abstract A device for information playback in multichannel digital seismic recording systems based on the compression of the dynamic range of signals and consisting in that information recorded in digital multiplex form as values of signal samples in channels having respective gains is read off the carrier and converted into amplitude pulse multiplex signals accounting for the respective gains, thus recovering the original dynamic range of signals of a channel, compressing in a similar manner the recovered dynamic range of channel signals to a value acceptable for visual display, the channel signals obtained in the compressed dynamic range being demultiplexed and visually displayed.
Inventors
- 👤 G Borkovsky
- 👤 A Drozdov
- 👤 V Kriesburg
- 👤 A Tsukanov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24; G01V1/245
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
328 words
A device for playback of information in multichannel digital seismic systems which record information in the form of time multiplex of channels with compression of the dynamic range, comprising: a digital-to-analog converter means including an input adapted to receive recorder information and an output at which is produced an analog signal carrying time multiplexed information; a dynamic range recovery means connected to the output of said converter means and including an output at which is produced signals brought to a common scale; an AGC unit for the signals which occur at the output of said recovery means, said AGC unit including an input and output, the latter said input being connected to the output of said recovery means; channel demultiplexer means including an input and outputs for each channel; the input of said demultiplexer means being connected with said output of said AGC unit; shapers for the continuous analog signals in each channel respectively connected to an output of said demultiplexer means, and an oscillograph connected to the output of said shaper, said AGC unit including a main amplifier with a controlled gain factor and which includes two inputs and one output, the first of the latter said inputs being connected to the output of said dynamic range recovery means and said output being connected to said input of said demultiplexer means; a feedback circuit including inputs and an output; one of the latter said inputs of the feedback circuit being connected to the output of said main amplifier, and the latter said output being connected to said second input of said main amplifier, said feedback circuit including a switchable divider means including inputs and an output connected to another input of said feedback circuit, a multivibrator including an output connected to one input of said divider, and a time relay including an input adapted to receive a start signal for the time marking of information recording and including an output connected to another input of said divider.
Claim 2
Independent Claim
328 words
A device for playback of information in multichannel digital seismic systems which record information in the form of time multiplex of channels with compression of the dynamic range, comprising: a digital-to-analog converter means including an input adapted to receive recorder information and an output at which is produced an analog signal carrying time multiplexed information; a dynamic range recovery means connected to the output of said converter means and including an output at which is produced signals brought to a common scale; an AGC unit for the signals which occur at the output of said recovery means, said AGC unit including an input and output, the latter said input being connected to the output of said recovery means; channel demultiplexer means including an input and outputs for each channel; the input of said demultiplexer means being connected with said output of said AGC unit; shapers for the continuous analog signals in each channel respectively connected to an output of said demultiplexer means, and an oscillograph connected to the output of said shaper, said AGC unit including a main amplifier with a controlled gain factor and which includes two inputs and one output, the first of the latter said inputs being connected to the output of said dynamic range recovery means and said output being connected to said input of said demultiplexer means; a feedback circuit including inputs and an output; one of the latter said inputs of the feedback circuit being connected to the output of said main amplifier, and the latter said output being connected to said second input of said main amplifier, said feedback circuit including a switchable divider means including inputs and an output connected to another input of said feedback circuit, a multivibrator including an output connected to one input of said divider, and a time relay including an input adapted to receive a start signal for the time marking of information recording and including an output connected to another input of said divider.
Claim 3
Dependent Claim
42 words
A device as claimed in claim 1, which comprises a mixer of signals provided from the outputs of said shapers of the central and two opposite extreme channels; the output of said mixer being connected to the input of said feedback circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |