H - Electricity – 03 – C
Patent
H - Electricity
03
C
332/1, 354/137,
H03C 1/00 (2006.01)
Patent
CA 1257663
22 Abstract An angle modulated periodic waveform is syn- thesized by generating three digital number sequences. In a first number sequence, one number thereof is generated on each occurrence of a periodic clock signal and has a magnitude which is a selected first periodic function of the number of prior occurring clock signals. In a second number sequence, one number thereof is generated on each occurrence of said clock signal and has a magnitude which is a selected second function of prior occurring numbers of said first number sequence and an applied constant car- rier waveform frequency parameter. Each number of the second number sequence is added as it is generated to a stored second address number. In the third number sequence, one number thereof is generated on each occurrence of said clock signal and has a magnitude which is a selected third periodic function of said stored second address number. Each number of the third number sequence is converted to a voltage of pro- portional magnitude by a digital-to-analog conver- ter, the output of which comprises the synthesized angle modulated waveform. The second function may be selectively adjusted by application of an exter- nal control signal such that the output waveform may exhibit either frequency or phase modulation.
502644
Kirby Eades Gale Baker
Tektronix Inc.
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