| 摘要 |
<p>A monitor system for monitoring the heartbeat, in particular of a baby, without being attached to the living being, comprising a transducer (40, 80) responsive the the heartbeat to generate an electrical signal, the system further comprising a filter (226) for filtering the electrical signal and processing circuitry (236) to process the filtered signal. An oscillating element generates, in response to a heartbeat signal, a sinusoidal signal of decaying amplitude. The oscillating element comprises an active band-pass filter (230), which passes a selected range of frequencies centred on a frequency of between 10 Hz and 15 Hz. The processing circuitry (236) is arranged to activate an alarm if the heartbeat ceases.</p> |
