Joachim Henke wrote:
Ok, I simplified my patch to generate just plain square waves. Indeed,
its sound is much closer to a real PC speaker now.
Does "cut off frequency" mean, that we have silence above that specific
frequency?
No. Typical cutoff freq is where components of the signal are attenuated by
3dB (i.e. are half as loud). At 2 times taht frequency they'll be attenuated
by 3 + A dB, where A is filter's rate in dB/octave. Typical 1st order filter
is 6dB/octave, 2nd order is 12dB/octave, etc. Typical soundards used no more
than 2nd order filter.
But, if you want to have your path behave really nicely, you should simply
not generate at all waves at frequencies above half of current output
sampling rate -- those can't be reproducted -- instead significant
distortion will be generated (google for Nyquist frequency).
rgds
--
Sebastian Kaliszewski
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