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    • 7. 发明授权
    • Apparatus for monitoring child activity
    • 用于监测儿童活动的装置
    • US5119072A
    • 1992-06-02
    • US633048
    • 1990-12-24
    • Mark D. Hemingway
    • Mark D. Hemingway
    • G08B21/02G08B21/24H04B1/04H04B1/16
    • G08B21/023G08B21/0247G08B21/0288H04B1/04H04B1/16
    • Apparatus for monitoring a child or the like includes a transmitter having a microphone and an oscillator coupled to an antenna within an enclosure for mounting on a child's arm and transmitting a frequency-modulated rf signal from the antenna. A separate receiver, within an enclosure constructed to be hand carried by a parent, includes circuitry for separating the audio and carrier components of the signal received at the receiver, and comparing field strength of the carrier component to a range threshold. When the amplitude of the carrier field strength is less than the threshold value, an alarm is sounded to indicate that the child is out of desired range. The audio component is fed to a speaker so that the parent can monitor the activities of the child.
    • 用于监测儿童等的装置包括具有麦克风的发射器和耦合到外壳内的天线的振荡器,用于安装在儿童的手臂上并从天线发射调频的rf信号。 在构造为由父母手持的机箱内的单独的接收机包括用于分离在接收机处接收的信号的音频和载波分量的电路,并将载波分量的场强与范围阈值进行比较。 当载波场强度的幅度小于阈值时,发出警报以指示儿童超出期望的范围。 音频组件被馈送到扬声器,使得父母可以监视孩子的活动。