Roll-along switch
AssigneeLitton Resources Systems, Inc.
InventorJohn T. Bobbitt
Life of this patent
Estimating the term…
Abstract
The electronic roll-along switch consists of several input multiplexers, each having a number of inputs that are connected to seismic detectors, and an output line. A plurality of multiple-input sample-and-hold modules are provided. Corresponding inputs of the respective sample-and-hold modules are paralleled. The output lines of the input multiplexers are connected in consecutive order to the paralleled input of the sample-and-hold modules. The output of each sample-and-hold module is connected to an output amplifier which is couplable to a multichannel seismic recording system. A master controller provides circuitry for connecting any set of several seismic detectors to a like number of channels in the seismic recording system.
Claims8
A roll along switch for sequentially connecting successive sets of seismic detectors, each set having a desired number of seismic detectors selected from a plurality of such detectors, to a like desired number of recording channels of a multichannel recording system comprising:
- a plurality of seis-line input multiplexers each having a number of input channels and an output line, each said input channel being connected to one of said plurality of seismic detectors;
- a plurality of multiple-input sample-and-hold modules having an output coupled to each said recording channel, the number of inputs being equal to the number of seis line input multiplexers, corresponding inputs of said multiple-input sample-and-hold modules being connected in parallel, the output line of each one of said seis-line input multiplexer being coupled to a corresponding one of the paralleled inputs of said sample-and-hold modules in consecutive order;
- means cooperating with said seis-line input multiplexers and said multiple-input sample-and-hold modules, for selectively coupling a desired set of seismic detectors to said recording channels;
- group-select and sample switches associated with each said sample-and-hold module;
- means for forming an initial address code;
- means for assigning an ordinal channel-number code to each said sample-and-hold module and its associated output channel and means for summing said initial address with said ordinal number code to form a seis-line address code;
- means for decoding said seis-line address code into a corresponding group-select code and a sample-enable code;
- and
- means for addressing the group select switches of said sample-and-hold modules so that said group-select code enables a selected one of the input channels of each said sample-and-hold module and said sample-enable code enables the sample switch of a selected one of said sample-and-hold modules.
A roll-along switch for connecting a first desired set of seismic detectors, selected from a plurality of such detectors disposed at intervals along a line of survey, to a multichannel recording system having a desired sample interval, comprising:
- a plurality of seis-line input multiplexers, each having a number of input lines and an output line, each input line of the respective input multiplexers being connected to a different one of said plurality of seismic detectors;
- means for advancing in unison said input multiplexers to connect in turn, each said input line to the output line of the respective multiplexers at desired multiplex intervals;
- a plurality of multiple-input sample-and-hold modules, each having an output couplable to corresponding channels of said multichannel recording system, the respective inputs of each said sample-and-hold module being connected in parallel, the output lines of the respective seis-line input multiplexers being connected in consecutive order to corresponding ones of the paralleled inputs of said sample-and-hold modules;
- means synchronized with said input-multiplexer advancing means, for sampling in consecutive order the signal present on the input lines of each said sample-and-hold module;
- group-select and sample switches associated with each said sample-and-hold module;
- means for forming an initial address code;
- means for assigning an ordinal channel-number code to each said sample-and-hold module and its associated output channel and means for summing said initial address with said ordinal number code to form a seis-line address code;
- means for decoding said seis-line address code into a corresponding group-select code and a sample-enable code;
- and
- means for addressing the group select switches of said sample-and-hold modules so that said group-select code enables a selected one of the input channels of each said sample-and-hold module and said sample-enable code enables the sample switch of a selected one of said sample-and-hold modules.
A roll-along switch for sequentially connecting desired successive sets of seismic detectors, selected from a plurality of such detectors, to a multichannel data acquisition system, comprising:
- a first multiplexing stage having a plurality of inputs coupled to the plurality of detectors and having a lesser plurality of outputs;
- a second multiplexing stage having a plurality of inputs coupled to the outputs of said first multiplexing stage and having a number of outputs equal to the number of channels in the multichannel data acquisition system;
- means for advancing the first multiplexing stage at desired intervals;
- group select switches associated with the inputs of said second multiplexer stage and signal-sampling switches associated with the outputs of the second multiplexer stage;
- means for forming a seis-line address code;
- means, associated with said second multiplexer stage, for decoding the seis-line address code into a group-select code and a sample-enable code;
- means for applying the group select code to the group select switches to select a desired set of seismic detectors;
- and
- means for applying the sample-enable code to the signal-sampling switches to sample at desired intervals the signal present at the inputs of the second multiplexer stage.
Dependencies are inferred from the claim text.