H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/16
H04M 3/02 (2006.01)
Patent
CA 1150867
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 device 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 gen- erating a series of values representing points along a sine wave form such that, as the first counting device 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 device is utilized to increase the time required for the first counting device to generate all of the address signals for one-cycle of the sine wave form. The second counting device divides the first counting device output frequency by a second predetermined integer to generate signals to disable the first counting device for at least one count each. The second integer is selected to obtain the number of missed counts of the first counting device which will result in an actual cycle time as close to the selected cycle time as possible.
400323
Reliance Electric Company
Ridout & Maybee Llp
LandOfFree
Programmable ringing generator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Programmable ringing generator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable ringing generator will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-240096