Electrocardio recording and reproducing system

Claim 1

A SYSTEM FOR RECORDING AND DISPLAYING SUCCESSIVE ELECTROCARDIAC SIGNAL SEQUENCES CHARACTERIZED BY P, Q, R, S AND T WAVES WHEREIN THE R WAVE IS NORMALLY OF GREATER MAGNITUDE THAN ANY OF THE PRECEDING WAVES, COMPRISING ELECTRODE MEANS FOR DERIVING SAID SIGNALS FROM A SUBJECT, A MAGNETIC RECORDER ADAPTED TO BE CARRIED ABOUT BY THE SUBJECT FOR RECORDING SAID SIGNALS ON A LONGITUDINALLY MOVING TAPE, SAID RECORDER INCLUDING TWO LATERALLY SPACED RECORDING HEADS, MEANS FOR SIMULTANEOUSLY ENERGIZING SAID RECORDING HEADS WITH THE SAME SIGNALS DERIVED BY SAID ELECTRODE MEANS, MEANS FOR MOVING SAID TAPE PAST SAID RECORDING HEADS AT A FIXED RECORDING SPEED, SAID RECORDING HEADS BEING LONGITUDINALLY SPACED IN THE DIRECTION OF TAPE MOVEMENT WHEREBY THE SAME SIGNAL SEQUENCES ARE RECORDED IN TWO SIDE-BY-SIDE AND LONGITUDINALLY OFFSET SIGNAL TRACKS WITH THE R WAVE OF A GIVEN SEQUENCE LONGITUDINALLY SPACED ALONG THE TRACKS FROM THE P WAVE OF THAT SEQUENCE, A REPRODUCING MECHANISM COMPRISING TWO LATERALLY SPACED REPRODUCING HEADS, ONE FOR EACH SIGNAL TRACK, MEANS FOR MOVING SAID TAPE PAST SAID HEADS AT A FIXED MULTIPLE OF THE RECORDING SPEED, SAID REPRODUCING HEADS BEING LONGITUDINALLY SPACED IN THE DIRECTION OF TAPE MOVEMENT BY A DISTANCE DIFFERENT FROM THE LONGITUDINAL SPACING OF THE RECORDING HEADS WHEREBY THE P WAVE OF A GIVEN SIGNAL SEQUENCE ON A TRACK REACHES ONE REPRODUCING HEAD AT APPORXIMATELY THE TIME THAT THE START OF THE R WAVE OF THE SAME SIGNAL SEQUENCE REACHES THE OTHER REPRODUCING HEAD, A CATHODE-RAY OSCILLOSCOPE HAVING VERTICAL AND HORIZONTAL SWEEP CIRCUIT INPUTS, AND AMPLIFIER CIRCUIT CONNECTING SAID ONE REPRODUCING HEAD TO THE VERTICAL SWEEP CIRCUIT INPUT, AND A SYNCHRONIZING CIRCUIT CONNECTING THE OTHER REPRODUCING HEAD WITH THE HORIZONTAL SWEEP CIRCUIT INPUT, SAID SYNCHRONIZING CIRCUIT INCLUDING MEANS RESPONSIVE EXCLUSIVELY TO SIGNALS DERIVED FROM THE OTHER REPRODUCING HEAD OF A PREDETERMINED ORDER OF MAGNITUDE RELATED TO THE SUCCESSIVE R WAVES REPRODUCED THEREBY FOR STARTING THE HORIZONTAL SWEEP OF SAID OSCILLOSCOPE FOR A GIVEN SIGNAL SEQUENCE COINCIDENTALLY WITH THE START OF THE P WAVE OF THAT SIGNAL SEQUENCE, WHEREBY SUCCESSIVE SIGNAL SEQUENCES PRODUCE OVERLAPPING TRACES ON SAID OSCILLOSCOPE.

Claim 2

A SYSTEM FOR RECORDING AND DISPLAYING SUCCESSIVE ELECTROCARDIAC SIGNAL SEQUENCES CHARACTERIZED BY P, Q, R, S AND T WAVES WHEREIN THE R WAVE IS NORMALLY OF GREATER MAGNITUDE THAN ANY OF THE PRECEDING WAVES, COMPRISING ELECTRODE MEANS FOR DERIVING SAID SIGNALS FROM A SUBJECT, A MAGNETIC RECORDER ADAPTED TO BE CARRIED ABOUT BY THE SUBJECT FOR RECORDING SAID SIGNALS ON A LONGITUDINALLY MOVING TAPE, SAID RECORDER INCLUDING TWO LATERALLY SPACED RECORDING HEADS, MEANS FOR SIMULTANEOUSLY ENERGIZING SAID RECORDING HEADS WITH THE SAME SIGNALS DERIVED BY SAID ELECTRODE MEANS, MEANS FOR MOVING SAID TAPE PAST SAID RECORDING HEADS AT A FIXED RECORDING SPEED, SAID RECORDING HEADS BEING LONGITUDINALLY SPACED IN THE DIRECTION OF TAPE MOVEMENT WHEREBY THE SAME SIGNAL SEQUENCES ARE RECORDED IN TWO SIDE-BY-SIDE AND LONGITUDINALLY OFFSET SIGNAL TRACKS WITH THE R WAVE OF A GIVEN SEQUENCE LONGITUDINALLY SPACED ALONG THE TRACKS FROM THE P WAVE OF THAT SEQUENCE, A REPRODUCING MECHANISM COMPRISING TWO LATERALLY SPACED REPRODUCING HEADS, ONE FOR EACH SIGNAL TRACK, MEANS FOR MOVING SAID TAPE PAST SAID HEADS AT A FIXED MULTIPLE OF THE RECORDING SPEED, SAID REPRODUCING HEADS BEING LONGITUDINALLY SPACED IN THE DIRECTION OF TAPE MOVEMENT BY A DISTANCE DIFFERENT FROM THE LONGITUDINAL SPACING OF THE RECORDING HEADS WHEREBY THE P WAVE OF A GIVEN SIGNAL SEQUENCE ON A TRACK REACHES ONE REPRODUCING HEAD AT APPORXIMATELY THE TIME THAT THE START OF THE R WAVE OF THE SAME SIGNAL SEQUENCE REACHES THE OTHER REPRODUCING HEAD, A CATHODE-RAY OSCILLOSCOPE HAVING VERTICAL AND HORIZONTAL SWEEP CIRCUIT INPUTS, AND AMPLIFIER CIRCUIT CONNECTING SAID ONE REPRODUCING HEAD TO THE VERTICAL SWEEP CIRCUIT INPUT, AND A SYNCHRONIZING CIRCUIT CONNECTING THE OTHER REPRODUCING HEAD WITH THE HORIZONTAL SWEEP CIRCUIT INPUT, SAID SYNCHRONIZING CIRCUIT INCLUDING MEANS RESPONSIVE EXCLUSIVELY TO SIGNALS DERIVED FROM THE OTHER REPRODUCING HEAD OF A PREDETERMINED ORDER OF MAGNITUDE RELATED TO THE SUCCESSIVE R WAVES REPRODUCED THEREBY FOR STARTING THE HORIZONTAL SWEEP OF SAID OSCILLOSCOPE FOR A GIVEN SIGNAL SEQUENCE COINCIDENTALLY WITH THE START OF THE P WAVE OF THAT SIGNAL SEQUENCE, WHEREBY SUCCESSIVE SIGNAL SEQUENCES PRODUCE OVERLAPPING TRACES ON SAID OSCILLOSCOPE.