Electromagnetic seismic transducer system

Claim 1

A SYSTEM FOR GENERATING A SEISMIC SIGNAL IN THE EARTH HAVING A WAVE SHAPE CLOSELY APPROXIMATING THE WAVE SHAPE OF A CONTROL SIGNAL COMPRISING: A BASE PLATE MEMBER FOR ENGAGING THE EARTH; A REACTION MASS MEMBER COUPLED TO SAID BASEPLATE MEMBER; ELECTROMAGNETIC DRIVE MEANS, SAID DRIVE MEANS HAVING A PLURALITY OF COILS ATTACHED TO SAID REACTION MASS MEMBER SUCH THAT WHEN ENERGIZED WILL RECIPROCATE THE MASS MEMBER RELATIVE TO THE BASEPLATE MEMBER; CLOCK CIRCUIT MEANS FOR GENERATING A SEQUENCE OF CLOCK PULSES; VOLTAGE COMPARATOR AND THRESHOLD CIRCUIT MEANS FOR COMPARING THE VOLTAGE LEVEL OF THE CONTROL SIGNAL WITH A FEEDBACK SIGNAL VOLTAGE AND PASSING THE CLOCK PULSES THROUGH A POSITIVE OUTPUT WHEN THE CONTROL SIGNAL VOLTAGE EXCEEDS THE FEEDBACK SIGNAL VOLTAGE BY A PREDETERMINED THRESHOLD VALUE AND FOR PASSING THE CLOCK CIRCUIT PULSES THROUGH A NEGATIVE OUTPUT WHEN THE FEEDBACK VOLTAGE EXCEEDS THE CONTROL SIGNAL VOLTAGE BY A PREDETERMINED THRESHOLD VALUE; LOGIC CIRCUIT MEANS FOR SUCCESSIVELY COUNTING THE PULSES FROM THE POSITIVE AND NEGATIVE OUTPUTS AND PRODUCING A STEPPED FEEDBACK SIGNAL TO THE VOLTAGE COMPARATOR AND THRESHOLD CIRCUIT WHICH INCREASES A STEP FOR EACH CLOCK PULSE COUNTED FROM THE POSITIVE OUTPUT AND DECREASES A STEP FOR EACH CLOCK PULSE COUNTED FROM THE NEGATIVE OUTPUT, THE FEEDBACK SIGNAL BEING APPLIED TO THE VOLTAGE COMPARATOR AND THRESHOLD CIRCUIT MEANS; POWER AMPLIFIER MEANS FOR ENERGIZING SAID COILS HAVING POSITIVE AND NEGATIVE CONTROL TERMINALS CONNECTED TO EACH COIL FOR APPLYING A POSITIVE OR NEGATIVE CURRENT, RESPECTIVELY, TO THE RESPECTIVE COILS; AND OUTPUT CIRCUIT MEANS INTERCONNECTING THE LOGIC CIRCUIT MEANS AND THE POSITIVE AND NEGATIVE CONTROLS TERMINALS OF THE POWER AMPLIFIER MEANS FOR APPLYING SIGNALS TO THE RESPECTIVE CONTROL TERMINALS IN SYNCHRONISM WITH THE STEPS OF THE FEEDBACK SIGNAL SO AS TO PRODUCE A TOTAL OUTPUT FORCE FROM THE COILS HAVING A STEPPED WAVE FROM SYNCHRONIZED WITH THE FEEDBACK SIGNAL AND APPROXIMATING THE WAVE FORM OF THE CONTROL SIGNAL.

Claim 2

A SYSTEM FOR GENERATING A SEISMIC SIGNAL IN THE EARTH HAVING A WAVE SHAPE CLOSELY APPROXIMATING THE WAVE SHAPE OF A CONTROL SIGNAL COMPRISING: A BASE PLATE MEMBER FOR ENGAGING THE EARTH; A REACTION MASS MEMBER COUPLED TO SAID BASEPLATE MEMBER; ELECTROMAGNETIC DRIVE MEANS, SAID DRIVE MEANS HAVING A PLURALITY OF COILS ATTACHED TO SAID REACTION MASS MEMBER SUCH THAT WHEN ENERGIZED WILL RECIPROCATE THE MASS MEMBER RELATIVE TO THE BASEPLATE MEMBER; CLOCK CIRCUIT MEANS FOR GENERATING A SEQUENCE OF CLOCK PULSES; VOLTAGE COMPARATOR AND THRESHOLD CIRCUIT MEANS FOR COMPARING THE VOLTAGE LEVEL OF THE CONTROL SIGNAL WITH A FEEDBACK SIGNAL VOLTAGE AND PASSING THE CLOCK PULSES THROUGH A POSITIVE OUTPUT WHEN THE CONTROL SIGNAL VOLTAGE EXCEEDS THE FEEDBACK SIGNAL VOLTAGE BY A PREDETERMINED THRESHOLD VALUE AND FOR PASSING THE CLOCK CIRCUIT PULSES THROUGH A NEGATIVE OUTPUT WHEN THE FEEDBACK VOLTAGE EXCEEDS THE CONTROL SIGNAL VOLTAGE BY A PREDETERMINED THRESHOLD VALUE; LOGIC CIRCUIT MEANS FOR SUCCESSIVELY COUNTING THE PULSES FROM THE POSITIVE AND NEGATIVE OUTPUTS AND PRODUCING A STEPPED FEEDBACK SIGNAL TO THE VOLTAGE COMPARATOR AND THRESHOLD CIRCUIT WHICH INCREASES A STEP FOR EACH CLOCK PULSE COUNTED FROM THE POSITIVE OUTPUT AND DECREASES A STEP FOR EACH CLOCK PULSE COUNTED FROM THE NEGATIVE OUTPUT, THE FEEDBACK SIGNAL BEING APPLIED TO THE VOLTAGE COMPARATOR AND THRESHOLD CIRCUIT MEANS; POWER AMPLIFIER MEANS FOR ENERGIZING SAID COILS HAVING POSITIVE AND NEGATIVE CONTROL TERMINALS CONNECTED TO EACH COIL FOR APPLYING A POSITIVE OR NEGATIVE CURRENT, RESPECTIVELY, TO THE RESPECTIVE COILS; AND OUTPUT CIRCUIT MEANS INTERCONNECTING THE LOGIC CIRCUIT MEANS AND THE POSITIVE AND NEGATIVE CONTROLS TERMINALS OF THE POWER AMPLIFIER MEANS FOR APPLYING SIGNALS TO THE RESPECTIVE CONTROL TERMINALS IN SYNCHRONISM WITH THE STEPS OF THE FEEDBACK SIGNAL SO AS TO PRODUCE A TOTAL OUTPUT FORCE FROM THE COILS HAVING A STEPPED WAVE FROM SYNCHRONIZED WITH THE FEEDBACK SIGNAL AND APPROXIMATING THE WAVE FORM OF THE CONTROL SIGNAL.