H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/14
H04M 3/02 (2006.01) G06F 1/03 (2006.01) G06J 1/00 (2006.01) H04M 19/02 (2006.01)
Patent
CA 1127335
PROGRAMMABLE RINGING GENERATOR ABSTRACT OF THE DISCLOSURE An apparatus for generating a selected one of a plurality of ringing frequencies utilizing a single frequency source. A first counting means is utilized to divide the source frequency by a first predetermined integer to generate a series of address signals at a rate proportional to the selected ringing frequency. A read only memory is responsive to the address signals for generating a series of values representing points along a sine wave form such that, as the first counting means continuously cycles to a maximum count total equal to the number of values stored in the read only memory, the sine wave form is repetitively generated. If the source frequency is not an integer multiple of the selected frequency, the first integer is selected to generate the closest higher frequency and a second counting means is utilized to increase the time required for the first counting means to generate all of the address signals for one cycle of the sine wave form. The second counting means divides the first counting means output frequency by a second predetermined integer to generate signals to disable the first counting means for at least one count each. The second integer is selected to obtain the number of missed counts of the first counting means which will result in an actual cycle time as close to the selected cycle time as Possible.
321490
Reliance Electric Company
Ridout & Maybee Llp
LandOfFree
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