Additive Synthesis after bandpass filter

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Anonymous
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Dear all,

   

I want to do additive synthesis (or harmonic synthesis of sine wave).
I use the solution filtering (band pass filtrer) to generate sine waves with timer 8 bits
on a PSOC1 Model CYC8C29466.
I create two harmonic signals (different frequencies, different amplitudes)
and I want to add these two analog signals.

   

What do you propose of solutions ?

   

Hardware ?

   

Software ?

   

Thank you very much for your propositions

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