Alarm system
DCFirst Claim
Patent Images
1. An alarm system which includes an alarm signalling device comprising a housing (1) adapted to be worn on the person, the alarm signalling device including:
- transmitter means (14) for sending out radio signals,a microphone (3) for picking up sounds and producing audio signals to modulate said transmitter means,emergency trigger means (2) for operating the transmitter means (14), andcode generator means (16) for modulating the transmitter means with an encoded identification signal, said transmitter means, said microphone, said trigger means and said code generator means being operatively interconnected, and said transmitter means (14) being constructed to transmit, for an initial period, encoded information from said code generator means (16), and to thereafter switch automatically to transmit said audio signals for a second period.
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Abstract
A signalling device to be worn on the person includes an emergency button (2) which triggers an internal transmitter to transmit an encoded identification signal followed by audio signals derived from sounds picked up by a microphone (3). The transmitted signals are picked up by a control box (21) containing a radio receiver which encodes the signals and commands an alarm box (24) to send out an audible and/or visual warning. Such warnings alternate with periods in which the alarm box broadcasts sounds picked up by the microphone (3).
33 Citations
7 Claims
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1. An alarm system which includes an alarm signalling device comprising a housing (1) adapted to be worn on the person, the alarm signalling device including:
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transmitter means (14) for sending out radio signals, a microphone (3) for picking up sounds and producing audio signals to modulate said transmitter means, emergency trigger means (2) for operating the transmitter means (14), and code generator means (16) for modulating the transmitter means with an encoded identification signal, said transmitter means, said microphone, said trigger means and said code generator means being operatively interconnected, and said transmitter means (14) being constructed to transmit, for an initial period, encoded information from said code generator means (16), and to thereafter switch automatically to transmit said audio signals for a second period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification