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I'd like to make digital samples that construct sine waves. It's nothing but direct digital synthesis (DDS) before the digital-to-analog converter and filter.

I want to make a sinewave sample that swings between 1 and 10 (it could be any physical parameters such as voltage and current).

Look-up table determines almost accurate but not precise (due to quantization error) samples.

There could be two parameters

  1. Resolution of the look-up table: how precisely can a single value be expressed?
  2. Size of the look-up table : how many samples are between 1 and 10?

For example, If I have a LUT with an integer value and 4 samples, I have sinewave samples like 1, 3, 8, 10. But if I have 0.5 resolution and 8 samples, I can express it like 1, 1.5, 2.5, 4.5, 6.5, 8.5, 9.5, 10.

So my question is: How are size and resolution related to spurious contents (e.g., THD)?

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  • $\begingroup$ How is this different from your previous question? dsp.stackexchange.com/questions/92011/… $\endgroup$
    – Hilmar
    Feb 13 at 4:46
  • $\begingroup$ I’m voting to close this question because merging went "the wrong way". $\endgroup$
    – Peter K.
    Feb 13 at 13:58
  • $\begingroup$ Apologies for the rigamarole. I tried to merge the previous question onto this one, but the answers went to the closed question (the other one at the time was closed). Let me know if I need to more to fix this. $\endgroup$
    – Peter K.
    Feb 13 at 14:00

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