Apparatus for monitoring child activity
US5119072A · kind A · utility
Inventor
Key dates
| Filing date | Dec 24, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Dec 24, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/16
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.