Data compositing and array control system

• US 3,883,725 A
• Filed: 05/07/1973
• Issued: 05/13/1975
• Est. Priority Date: 05/07/1973
• Status: Expired due to Term

• Current Assignee: Donald R. Juiles, Fort J. Robert, James A. Westphal
• Original Assignee: Donald R. Juiles, Fort J. Robert, James A. Westphal
• Inventors: Fort, J. Robert, Westphal, James A., Juiles, Donald R.
• Primary Examiner(s): Ruggiero, Joseph F.
• Application Number:
  US05/358,078
• Time in Patent Office: 736 Days
• Field of Search: 235/151.3,181,152 340/15.5DP,15.5TS,15.5CD,172.5 346/33C
• US Class Current: 702/14
• CPC Class Codes: G01V 1/28 Processing seismic data, e.g. for interpretation or for event detection G01V1/48 takes precedence

Abstract

This abstract describes a system for acquisition of analog signals at one or more sensors, carrying these signals in groups of M channels to each of N spaced-apart array terminals, processing each signal in the array terminals by separately amplifying, adding to a shifting signal of selected amplitude, axis-crossing-coding these sum signals and storing as single bit pulses, one for each channel, in a parallel to serial converter. Each of the converters in each of the array terminals are operatively connected in series and to an array controller, which also controls a disc magnetic recorder to run at constant speed. The disc generates a disc clock, and responsive to the disc clock the converters are read out in series as a sequential train of MN bits and stored on the disc. Successive samples at subsequent digitizing intervals are stored on the disc, to form a first record. Subsequent records can be processed, coded and recorded, and composited with previous records on the disc.

Claims

1. In a data recording system having a repetitive source, in which on each repetition of said source one or more analog signals are detected, processed and axis-crossing-coded to form pulses which are stored, and said stored pulses are read out at selected digitalizing intervals to form a train of single bit signals, and said trains transmitted to a storage means, the method of recording and compositing said trains of single bit signals compositing the steps of:

a. controlling a magnetic disc means by clock means to run at constant speed, said disc having a plurality of tracks each with a transducing head;

b. responsive to said disc rotation producing said first train of single bit signals;

c. storing in sequence, along said tracks, in a first plurality of single bit spaced locations, each of the bits in said first train;

d. repeating said source and responsive to said disc rotation producing and transmitting to said disc a second train of single bit signals representative of a second record;

e. reading out from said disc said stored first train of bits in said first single bit locations;

f. storing said second train of single bit signals in said first plurality of spaced single bit locations; and

g. storing said first train of bits in a second pluraliaty of spaced multiple bit word locations.

2. The method as in claim 1 including the additional steps of:

h. repeating said source for a third time and responsive to said disc rotation, producing and transmitting to said recording means a third train of single bit signals representative of a third record;

i. responsive to the rotation of said disc, reading out from said first locations on said disc said stored second train of bits and from said second locations said first train of bits;

j. adding said second train of bits and said first train of bits to form a first train of sum words;

k. responsive to the rotation of said disc storing said first train of susm words in said second plurality of multiple-bit word locations; and

l. responsive to the rotation of said disc storing said third train of single bit signals in said first plurality of spaced single-bit positions.

3. The method as in claim 1 in which said system is a seismic geophysical system and in which said analog signals are geophone signals.

4. The method as in claim 3 in which the processing of said geophone signals includes the steps of:

a. amplifying said geophone signals;

b. generating a uniformly distributed random noise of selected amplitude; and

c. adding said amplified signal and said noise to form a sum signal, which sum signals are subsequently axis-crossing-coded.

5. A signal detecting, coding and multiplexing system, comprising:

a. a plurality of detectors generating analog signals representative of physical parameters, and means to amplify said analog signals;

b. means to generate a plurality of different shifting functions of selected amplitude, and means to add one of said shifting functions to each one of said plurality of analog signals to form a plurality of sum signals;

c. magnetic disc recording means having a plurality of tracks, with transducing heads mounted operatively on each track, said disc controlled by clock means to run at constant speed, and means on said disc to generate electrical control pulses in synchronism with its rotation;

d. first means responsive to said electrical control pulses to generate first commands at first time intervals and means responsive to said first commands to code said plurality of sum signals into axis-crossing-coded pulses, and means responsive to said first commands to store said coded pulses in parallel-to-serial converter means;

e. second means responsive to said electrical control pulses to generate second commands at second time interval and means responsive to said second commands to read out from said parallel-to-series conveRter means said stored coded pulses, in the form of a first train of sequential single bit pulses, on a transmitting means; and

f. means to store said first train of sequential bit pulses on said disc means in first selected spaced positions on said plurality of tracks.

6. The system as in claim 5, including:

a. means to produce a second train of sequential bit pulses representing new data;

b. means to read out from said first selected spaced positions on said plurality of tracks said first train of sequential bit pulses;

c. means to record in said first selected spaced positions on said plurality of tracks said second train of sequential bit pulses; and

d. means to record in second selected spaced positions on said plurality of tracks said first train of sequential bit pulses.

7. The system as in claim 6 including:

a. means to produce a third train of sequential bit pulses representing new data;

b. means to read out from said first selected spaced positions on said plurality of tracks said second train of sequential bit pulses;

c. means to read out from said second selected spaced positions on said plurality of tracks said first train of sequential bit pulses;

d. means to add said second train of sequential bit pulses and said first train of sequential bit pulses to form a train of first sum multiple-bit words;

e. means to record in said first selected spaced positions on said plurality of tracks said third train of sequential bit pulses; and

f. means to record said train of first sum multiple-bit words in said second selected spaced positions on said plurality of tracks.

8. In a system for compositing a plurality of sequential signal bit signals on a disc recording means, having a plurality of tracks each with its own read/write head, said disc having means to generate a train of disc clock pulses corresponding to each successive bit position on said tracks, said tracks having a first plurality of spaced single-bit storage locations for the storage of new data in the form of a train of single bit pulses, and a second plurality of spaced multiple-bit storage locations, for the storage of old data in the form of a composited plurality of single bit trains;

the method of compositing the steps of;

a. responsive to said disc clock pulses reading out of said first storage the last previous single bit train and passing to an adder means;

b. responsive to said disc clock pulses reading out of said second storage the composited old data, and passing said old data to said adder means;

c. responsive to said disc clock pulses adding said previous bit train and said composited old data to form a sum signal and passing the sum signal into a buffer register;

waiting for two revolutions of said disc;

d. responsive to said disc clock pulses reading out said sum signal from said buffer and recording on said disc in said second storage locations; and

e. responsive to said disc clock pulses recording the next train of new data into said first storage positions.