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    • 3. 发明授权
    • Stand-off non-invasive acoustic baby monitor
    • 支持非侵入式声学婴儿监护仪
    • US6150941A
    • 2000-11-21
    • US305900
    • 1999-05-05
    • Paul Daniel GeigerLonnie H. Hudgins
    • Paul Daniel GeigerLonnie H. Hudgins
    • A61B5/113G08B23/00
    • A61B5/113A61B2503/06
    • A stand-off, non-invasive acoustic detector for monitoring physical activity and/or breathing activity of children and infants. According to a preferred embodiment, the present invention comprises a two-phase output oscillator coupled to an ultrasonic transmitter and microphone. A respective one of the outputs of the oscillator drives the ultrasonic transmitter, through a power amplifier, which sends out an ultrasound wave. The echo return is picked up by the microphone and thereafter band passed to isolate those frequencies falling within 33 to 40 kHz. Such signal is further adjusted for automatic gain control. The resultant echo return signal is compared to the respective other output of the oscillator, the latter also being adjusted for automatic gain control, which are then combined via a summing junction to produce a resultant signal, the latter being utilized to drive a phase comparator and an alarm timer. To the extent the resultant signal, which corresponds to continuous breathing activity or physical activity, deviates substantially from the signal produced by the comparator for a sufficient length of time, an alarm is activated to signal either abnormal breathing activity or a lack of breathing activity, the latter indicative of either a medical condition, such as SIDS, or the absence of the child from the monitored area.
    • 一种用于监测儿童和婴儿的身体活动和/或呼吸活动的独立的非侵入性声学检测器。 根据优选实施例,本发明包括耦合到超声波发射器和麦克风的两相输出振荡器。 振荡器的相应输出之一通过功率放大器来驱动超声波发射器,功率放大器发出超声波。 回波返回由麦克风拾取,然后通过频带,以隔离在33至40 kHz范围内的频率。 进一步调整这种信号以进行自动增益控制。 将所得到的回波信号与振荡器的相应的另一个输出进行比较,后者也被调整用于自动增益控制,然后通过一个加法结合起来产生一个合成信号,后者用于驱动一个相位比较器 闹钟定时器 在相当于持续的呼吸活动或身体活动的结果信号在足够长的时间内基本上偏离由比较器产生的信号的程度上,启动警报来表示异常的呼吸活动或呼吸不足的活动, 后者指示诸如小岛屿发展中国家之类的医疗状况,或监测区域没有儿童。