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RECORDING DEVICE WITH AUTOMATIC GAIN RANGE CHANGER AND D.C. CORRECTION MEANS

  • US 3,699,948 A
  • Filed: 05/14/1971
  • Issued: 10/24/1972
  • Est. Priority Date: 05/16/1970
  • Status: Expired due to Term
First Claim
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1. A recording device comprising a bioelectrode for detecting an electrocardiograph signal, means for detecting a peak-peak value of said electrocardiograph signal, means for changing the range in which gain is automatically selected in accordance with said peak-peak value so as to obtain an electrocardiograph signal of suitable amplitude regardless of amplitude of detected electrocardiograph signal, means for detecting an asymmetrical DC signal of said electrocardiograph signal in order to record an electrocardiogram at the center of the recording paper and a recorder for recording said electrocardiograph signal passed through said range changer after superimposing said asymmetrical DC signal.

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