Synthesizer for testing elements of a geophysical data acquisiti

Details Synthesizer for testing elements of a geophysical data acquisiti Synthesizer for testing elements of a geophysical data acquisiti

1975-10-01

1977-08-02

Malzahn, David H.

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Transfer mechanism

Traveling pawl

328 14, 340347AD, H03K 1302

Patent

active

040398064

ABSTRACT:
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.

REFERENCES:
patent: 3657657 (1972-04-01), Jefferson
patent: 3735269 (1973-05-01), Jackson
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 3877023 (1975-04-01), Spicer et al.
Analog-Digital Conversion Handbook by Analog Devices, Inc., June 1972 pp. II-79 & III-82-III-83.
H. Rossero "Analog Switch with Gating Spike Suppression" IBM Tech. Discl. Bulletin vol. 14, No. 9, Feb. 1972, pp. 2825-2826.

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