| 摘要 |
<p>Apparatus for monitoring a fetal heart-beat extracts one or more fetal electrocardiograms (fECGs) from a composite signal detected at the abdomen of a pregnant woman. The apparatus includes specific low-noise components: a plurality of low-noise electrodes (1 - 3, R) for placement on the abdomen during pregnancy and a low-noise signal recording and processing means (34). Screened leads are also used, as required. Signals indicative of voltages developed between each abdominal electrode (1 - 3) and a reference electrode (R) are recorded in multiple signal channels. Data within each channel is digitised and processed in order to generate separated source signals, at least one of which relates to the fECG of a single fetus. Single-channel fECGs may be reconstructed using the source signals identified as belonging to the same fetus.</p> |
