Accession Number : ADD018471

Title :   Circuit for Modulating a Sinusoidal Waveform Signal Using Digital Pulse Shaping.

Descriptive Note : Patent, Filed 26 Jan 95, patented 27 May 97,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Snelgrove, Andrew H ; Cirineo, Anthoney V ; Law, Eugene L

Report Date : 27 May 1997

Pagination or Media Count : 68

Abstract : An electronics circuit for frequency shift keying a continuous running carrier 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.

Descriptors :   *MICROCIRCUITS, *SINE WAVES, *FREQUENCY SHIFT KEYERS, *PATENTS, SIGNAL PROCESSING, DIGITAL SYSTEMS, COMPUTER PROGRAMMING, RANDOM ACCESS COMPUTER STORAGE, LOGIC CIRCUITS, MICROCOMPUTERS, CIRCUIT ANALYSIS, FREQUENCY ANALYZERS

Subject Categories : Electrical and Electronic Equipment
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE