| 摘要 |
<p>Physiological condition monitors (700) utilizing very low frequency acoustic signals and signal indicative of body orientation are disclosed. The physiological condition monitors (700) comprise a sensor (100) that is capable of detecting low frequency acoustic signals in the frequency range of one tenth Hertz to thirty Hz. The sensor (100) comprises a chamber (120) having portions that form a cavity (150) and a low frequency microphone (110) placed within the cavity (150). An alternate embodiment of the invention comprises a chamber (120) having portions that form a resonant cavity (440), a microphone (110) mounted in the resonant cavity (440), and a membrane (430) that covers the resonant cavity (440).</p> |
