Description: In the programming step, the electronic controller fills the memory with data. Each datum is a binary word representing the amplitude of the signal at an instant of time. The array of data in the memory then forms a table of amplitudes, with time implied by the position in the table. If, for example, the first half of the table were filled with zeroes and the second half with values of 100 , then the data would represent a square wave. Any other wave shape can be created simply by altering the data.
Devices are also available that cannot be programmed, and can only output sinewaves or a small number of waveforms.
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dds.doc
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