Apparatus for monitoring child activity
First Claim
1. Apparatus for monitoring range to a person from a monitoring station comprising:
- a transmitter including an enclosure having means for removably fastening said enclosure to a person to be monitored, means disposed within said enclosure for generating a frequency-modulated rf carrier signal, and a transmitting antenna projecting from said enclosure and coupled to said generating means for radiating said signal, anda receiver including a receiving antenna, means coupled to said receiving antenna for monitoring field strength of said carrier signal, means coupled to said means for monitoring field strength for sampling and holding a signal indicative of peak field strength, and means coupled to said means for sampling and holding for indicating range from said receiver to said transmitter as a function of peak field strength of said carrier signal at said receiver.
1 Assignment
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Accused Products
Abstract
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.
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Citations
13 Claims
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1. Apparatus for monitoring range to a person from a monitoring station comprising:
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a transmitter including an enclosure having means for removably fastening said enclosure to a person to be monitored, means disposed within said enclosure for generating a frequency-modulated rf carrier signal, and a transmitting antenna projecting from said enclosure and coupled to said generating means for radiating said signal, and a receiver including a receiving antenna, means coupled to said receiving antenna for monitoring field strength of said carrier signal, means coupled to said means for monitoring field strength for sampling and holding a signal indicative of peak field strength, and means coupled to said means for sampling and holding for indicating range from said receiver to said transmitter as a function of peak field strength of said carrier signal at said receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification