| 摘要 |
PURPOSE:To decrease an erroneous analysis caused by an artifact by widening a substantial dynamic range of an A/D converter so that it is scarcely influenced by the artifact. CONSTITUTION:In the case an output of an electrocardiogram amplifying part 1 biased by circuit 2 and inputted to an A/D converter 3 exceeds a conversion input range of the A/D converter 3 by influence of an artifact, etc., an output voltage of the bias circuit 2 is shifted into an A/D conversion range by varying a bias voltage 9, and a substantial dynamic range of the A/D converter 3 is widened. Accordingly, since the substantial dynamic range of the A/D converter 3 expands, the device comes to be scarcely influenced by the artifact, and an erroneous analysis caused by the artifact can be decreased. |
