Radio pager tone alarm circuit for generating variable duty...

Details Radio pager tone alarm circuit for generating variable duty... Radio pager tone alarm circuit for generating variable duty...

H - Electricity

04

B

H04B 1/16 (2006.01) G08B 3/10 (2006.01)

Patent

CA 2058536

"Radio Pager Tone Alarm Circuit For Generating Variable Duty Constant Audio Frequency Pulses Modulated With Unique Tone Pattern" ABSTRACT OF THE DISCLOSURE In a radio pager, a paging signal containing the pager's own identifier and a particular alert tone pattern is received. On receiving this signal, constant audio-frequency pulses having a duty ratio increasing as a function of time are generated and modulated with the alert tone pattern. The modulated pulses are applied to a loudspeaker for alerting the user with an escalating alert sound.

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