Accession Number : ADD007319

Title :   Electrical Waveform Synthesizer.

Descriptive Note : Patent Application,


Personal Author(s) : Schwager,Joseph Edward ; Urban,Harry Earle

Report Date : 24 Apr 1980

Pagination or Media Count : 25

Abstract : An electrical waveform synthesizer comprising a shift register loadable by digital values provided by a programmable logic means is presented. The loaded values correspond to analog waveform amplitudes with the number of samples of the values being inversely proportional to the waveform frequency to decrease harmonic content of the waveform. The values are stepped along the shift register stages by a clock frequency signal applied to a clock input of the shift register. Outputted values can be recirculated back to the input of the register for providing a repetitious waveform or can be continuously inputted and outputted without recirculation. The bandpass of the filter is adjustable by the logic means according to the frequency and complexity of the waveform. The output waveform frequency can be shifted by shifting the clock frequency generated by a fine frequency vernier comprising a plurality of adder circuits connected in series, each adder circuit being loadable with digital values by the logic means with the output of the respective adder being recirculated to the respective adder input under the control of a precision oscillator.

Descriptors :   *Patent applications, *Waveform generators, Shift registers, Analog to digital converters, Clocks

Subject Categories : Electrical and Electronic Equipment
      Computer Hardware
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE