Direct digital frequency synthesizer

Details Direct digital frequency synthesizer Direct digital frequency synthesizer

1977-09-06

1979-01-09

Heyman, John S.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 83D, 340347AD, 364721, H03B 1900

Patent

active

041340728

ABSTRACT:
A desired output frequency can be generated by applying a corresponding digital phase step number to an accumulator to generate multiples of the number for application to a sine wave look-up table from which digital samples of the sine wave amplitude are obtained. The digital samples can be applied through a digital-to-analog converter to produce the desired output frequency in analog form. A time division multiplex system is disclosed in which a plurality of digital phase step numbers are used to generate an equal plurality of output frequencies. Each digital phase shift number may be altered in accordance with modulating signals so that each output frequency is frequency-shift keyed, and/or phase shift keyed, and/or on-off keyed.

REFERENCES:
patent: 3689914 (1972-09-01), Butler
patent: 3735269 (1973-05-01), Jackson
patent: 3973209 (1976-08-01), Nossen et al.
patent: 3984771 (1976-10-01), Nossen et al.
patent: 4021757 (1977-05-01), Nossen
patent: 4053839 (1977-10-01), Knoedl
Computer Design Jul. 1975, pp. 100-102, "Digital Synthesizers Produce Wide Frequency Range from Single Source," by John D. Fogarty.
IEEE Transactions on Audio & Electroacoustics, Mar. 1971, pp. 49-57, "A Digital Frequency Synthesizer," by Joseph Tierney et al.

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