| 摘要 |
<p>Signal processing apparatus for use with an electrocardigraph monitoring activity of the human heart is disclosed. The apparatus receives input signals from electrodes attached to the body of a subject whose heart activity is being monitored. These electrodes include chest electrodes positioned at conventional positions V1, V2, V3, V4, V5 and V6 of the body and limb electrodes positioned at conventional positions RA, LA and LL of the body. Input signals (from electrodes at LA, LL, V1, V2, V3, V4, V5, V6, RA) are processed to synthesize one or more signals substantially corresponding to an unsynthesized signal or signals that would be produced by a further chest electrode or electrodes, if such were used on the body at a chest position or positions other than the conventional positions. The synthesized signal or signals (for leads V3R, V4R, V5R, V7, V8, V9) is or are then provided as an output to the electrocardiograph. The apparatus may include provision which selectively permits synthesized or unsynthetized signals to be prrovided as an output to the electrocardiograph. A method of monitoring heart activity of a human body comprises the steps of attaching chest electrodes at chest positions V1, V2, V3, V4, V5 and V6 of the body, attaching limb electrodes at positions RA, LA and LL of the body, sensing voltage signals produced by such electrodes in response to heart activity; and, synthesizing from the sensed signals a voltage signal substantially corresponding to a voltage signal that would be produced by a further chest electrode, if a further chest electrode was used.</p> |
