There is a thread in the forums at cSounds about micro frequency differences
between phasor and oscili.  In a nutshell, phasor's 440hz is slightly
different than oscili's 440hz.  This causes sine waves to eventually drift
until they're 180 out of phase.  More here:


"difference between phasor and tablei opcodes"
http://www.csounds.com/node/36


Any thoughts or explanations?

Best, 
Jake 
---- 
The Csound Blog 
http://www.thumbuki.com/csound/blog/


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Thanks!  Your explanation makes a lot of sense.  Since I'm not all that
familiar with the internals of Csound, I don't think I could have ever come
to that conclusion by myself.

As for your suggestion... Adding a phasor driven tablei signal to a poscil
signal 180 out of phase returned 0.0 amps after a 20 minute render.  That
certainly did the trick.

Best, 
Jake 
---- 
The Csound Blog 
http://www.thumbuki.com/csound/blog/



Victor.Lazzarini wrote:
> 
> These can be explained by the fact that oscil et al phaseaccumulator will
> have its precision dependent on the sizeof the table (because they use
> integer maths). You could try poscil to see if this "problem" is less
> apparent, as it uses 64-bit floating point indexing.Victor

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