Circuit for modulating a sinusoidal waveform signal using digita

Details Circuit for modulating a sinusoidal waveform signal using digita Circuit for modulating a sinusoidal waveform signal using digita

1995-01-26

1997-05-27

Tse, Young T.

Pulse or digital communications

Transmitters

Angle modulation

375303, H04L 2712

Patent

active

056338945

ABSTRACT:
An electronics circuit for frequency shift keying a continuous-running caer, such as a sinewave, which allows the user to vary two closely spaced frequencies from a personal computer. The electronics circuit of the present invention comprises a microcontroller which has stored therein a lower frequency and an offset frequency. After the electronics circuit is powered up the microcontroller enters the MAIN program and generates control and address signals to effect a transfer of thirty two data bits representing the lower frequency from the microcontroller to a pair of eight bit RAMS. A programmed array logic device, which receives addresses from the microcontroller, decodes the addresses and then provides chip select and output enable signals to the RAMs to allow the thirty two data bits to be written into the RAMs with the write signal being provided by the microcontroller.

REFERENCES:
patent: 4442530 (1984-04-01), Parrish, Jr. et al.
patent: 4686688 (1987-08-01), Chung et al.
patent: 5016259 (1991-05-01), Hershberger
patent: 5255288 (1993-10-01), Ichihara
patent: 5398031 (1995-03-01), Saji
patent: 5483554 (1996-01-01), Chauvel et al.

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