Digitally controlled ringer signal generation

Details Digitally controlled ringer signal generation Digitally controlled ringer signal generation

H - Electricity

04

M

H04M 1/53 (2006.01) G08B 3/10 (2006.01) H04M 19/04 (2006.01)

Patent

CA 2044437

A method and apparatus of producing an alarm or ringing signal comprising providing a first pulse signal having a predetermined pulse width to define an alarm or ringing signal amplitude, and modulating the pulse signal with a second pulse signal having a pulse rate at least an order lower than the frequency of the first pulse signal to define the alarm or ringing signal frequency, averaging the modulated first pulse signal in a loudspeaker voice coil and reproducing the result in the loudspeaker to provide the alarm or ringing signal.

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