Digital processor for selectively synthesizing sinusoidal...

Details Digital processor for selectively synthesizing sinusoidal... Digital processor for selectively synthesizing sinusoidal...

G - Physics

06

F

354/97

G06F 1/035 (2006.01) G01V 1/16 (2006.01) G01V 13/00 (2006.01)

Patent

CA 1083719

ABSTRACT OF THE DISCLOSURE DIGITAL PROCESSOR FOR SELECTIVELY SYNTHESIZING SINUSOIDAL WAVEFORMS, SAY SUITABLE FOR TESTING GEOPHONES OR COMBINATIONS OF GEOPHONES OF A GEOPHYSICAL DATA ACQUISITION SYSTEM This disclosure relates to a non-recursive digital synthesizer for producing a surprisingly accurate synthesized sinusoid suitable for testing elements of a geophysical data acquisition system in either a laboratory or a field environment. In accordance with the present invention, [ (C/2) +1]-discrete -16- bit binary words are stored in a read-only memory (ROM), representing discrete amplitudes of a digitized sinusoid in a frequency range of 1-500 Hz, and then accessed in succession to a digital-to-analog converter (DAC). A separate suppression circuit means at the output of the DAC is adapted to operate in synchronization with movement of the binary words through the DAC: in that way, glitches generated by the various digital elements of the synthesizer are suppressed. Result: accuracy of the generated sinusoid to the elements under test is assured.

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