Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-12-24
1992-06-02
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340539, G08B 2300
Patent
active
051190729
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.
REFERENCES:
patent: 2710345 (1955-06-01), Stephens
patent: 3087117 (1963-04-01), Mitchell
patent: 3105938 (1960-07-01), Onnigian
patent: 3177481 (1965-04-01), Joy et al.
patent: 4593273 (1986-06-01), Narcisse
patent: 4598272 (1986-07-01), Cox
patent: 4785291 (1988-11-01), Hawthorne
patent: 4814751 (1989-03-01), Hawkins et al.
patent: 4885571 (1989-12-01), Pauley et al.
patent: 4885796 (1989-12-01), Loftus et al.
patent: 4899135 (1990-02-01), Ghahariiran
Ng Jin F.
Oda Christine K.
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