Does SigmaDSP support both cosine and sine source?
Hi,
I'd like to create a "frequency shifter function" based on SigmaDSP platform.
And the algorithm diagram is shown below.
Here the Hilbert filter is a 256 FIR filter and cosine and sine signal source is about 2~10 Hz.
The system sample frequency is 48kHz.
So I need both sine and cosine signal source while there is only tone source in Sigmastudio lib.
Although I can delay half a period of sine wave to generate cosine wave, which need too many RAM consuming.
So I'd like to know how can I get both cosine and sine signal source efficiently.
No, there is not a way to generate a cosine wave that is 90 degrees out of phase with the sine wave other than by delaying one vs the other.
Please look at this article for a method for generating a sine and cosine with the same frequency using multiply, add, and delay cells. I will try to implement this in SigmaStudio when I have free time.
http://www.earlevel.com/main/2003/03/02/the-digital-state-variable-filter/
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Thank you,
EZ Admin
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