Direct digital synthesizer, direct digital synthesizer for...

Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed

Reexamination Certificate

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C382S244000

Reexamination Certificate

active

07818359

ABSTRACT:
In order to output amplitude data with the clock frequency higher than the clock frequency of phase data, the direct digital synthesizer for transmission and detection comprises: a transmitting phase for outputting a first phase data with a first clock frequency; a curtailing unit for outputting a second phase data with a second clock frequency smaller than the first clock frequency, and outputting additional data for compensating for phase information disappeared with curtailing process; an interpolating unit for outputting a third phase data with a third clock frequency larger than the first frequency by implementing interpolating process to the second phase data, and a detecting waveform for outputting amplitude data in accordance with the third phase data. The detecting signal amplitude data can be outputted with the third clock frequency higher than the second clock frequency of the second phase data transmitted.

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Lionel Cordesses, Direct Digital Synthesis: A Tool for Periodic Wave Generation (Part 1), 2004, pp. 50-54.
SIPO, China issued in connection with corresponding CN Application No. 200610139527.8 on Feb. 12, 2010.

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