Digitally controlled ringer signal generation
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United States of America Patent
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Jun 21, 1994
Grant Date -
N/A
app pub date -
Jun 5, 1992
filing date -
Jun 12, 1991
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Abstract
A method and apparatus, of producing an alarm or ringing signal by 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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