DYNAMIC EGG PRESENTATION

• US 3,718,772 A
• Filed: 12/09/1971
• Issued: 02/27/1973
• Est. Priority Date: 12/09/1971
• Status: Expired due to Term

• Current Assignee: Clifford Sanctuary
• Original Assignee: Clifford Sanctuary
• Inventors: Sanctuary, Clifford
• Primary Examiner(s): Canney, Vincent P.
• Assistant Examiner(s): Tupper, Robert S.
• Application Number:
  US05/206,485
• Time in Patent Office: 446 Days
• Field of Search: 128/2.6A,2.6G 179/1.2B
• US Class Current: 360/7
• CPC Class Codes: A61B 5/337 Playback at speeds other than the recording speed

Abstract

A reproducing system for use as a high speed magnetic tape scanning instrument to provide for the superimposing of recurring signals such as ECG complexes on a visual indicator such as an oscilloscope from signals previously recorded for long time periods by a very slow single-track magnetic tape recorder. Trigger signals are developed from the reproduction by a first playback head of the ECG signals recorded on the tape. The trigger signals are delayed a particular period to provide for control signals to control the activation of the oscilloscope sweep at the proper times to produce a stable superimposition of the ECG signals as reproduced by a second playback head spaced from the first playback head. The particular period of delay is provided electronically or electromechanically.

Claims

1. A system for reproducing recurring signals recorded on a magnetic medium and on a single track on the medium, including first and second means displaced in position along the medium a predetermined distance from each other for reproducing the recurring signals on the medium and with the first means providing for the reproduction before the second means, third means coupled to the first means for producing a trigger signal from the recurring signal reproduced by the first means and with the trigger signal including individual trigger pulses corresponding to a particular portion of each of the recurrent signals, fourth means coupled to the second means for providing a recurring display of the recurrent signal reproduced by the second means to provide a superimposed display of each of the recurrent signals on the preceding recurrent signal, fifth means coupled to the third means for delaying the trigger signal to compensate for the displacement of the position between the first and second means and the position of the particular portion of the recurrent signal used to provide the trigger signal relative to a position necessary to provide a full display of each recurrent signal, and sixth means coupled to the fourth and fifth means for controlling the sweep of the display of the recurrent signal in accordance with the delayed trigger signal.

2. The system of claim 1 wherein the recurrent signals are ECG signals and the trigger signals are formed from the R portion of the ECG complex.

3. The system of claim 1 wherein the fifth means includes a plurality of series of multivibrators the output of each controlling the suceeding multivibrator and with the plurality of multivibrators providing the delay.

4. The system of claim 1 wherein the fifth means includes a moving magnetic tape loop and with means for recording the trigger signal on the tape loop at a first position and repro-ducing the trigger signal from the tape loop at a second position displaced from the first position so as to provide the delay.

5. The system of claim 1 wherein the fifth means includes a moving magnetic disc and with means for recording the trigger signal on the disc at a first position and reproducing the trigger signal from the disc at a second position displaced from the first position so as to provide the delay.

6. A reproducing and display system for reproducing and displaying ECG signals recorded on a single track of a moving magnetic tape and with the ECG signals forming a recurring complex and including and R portion of increased amplitude relative to tHe other portions of the ECG complex, including first means coupled to the magnetic tape at a first position for reproducing the ECG signals, second means responsive to the ECG signals reproduced by the first means for displaying the ECG signals as reproduced by the first means, third means coupled to the second means for providing a recurring sweep of the ECG signals displayed by the second means, and fourth means coupled to the magnetic tape at a second position in advance of the first portion to reproduce at least the R portion of the ECG signals before the reproduction of the ECG signals by the first means and including means for producing a delayed trigger signal from the R portion of the ECG signal to control the recurring sweep provided by the third means to produce a superimposed display of each complete ECG complex relative to the preceding ECG complex.

7. The reproducing and display system of claim 6 wherein the delay provided by the means included in the fourth means compensates for the difference in position between the first and fourth means relative to the magnetic tape and the relative position between the R portion of the ECG complex and a point to provide a full display of the ECG complex.

8. The reproducing and display system of claim 6 wherein the delay provided by the means included in the fourth means is produced by a plurality of series multivibrators the output of each controlling the succeeding multivibrator.

9. The reproducing and display system of claim 6 wherein the delay provided by the means included in the fourth means is produced by a recording and reproducing system including a loop of magnetic tape.

10. The reproducing and display system of claim 6 wherein the delay provided by the means included in the fourth means is produced by a recording and reproducing system including a magnetic disc.