We can use SawOsc to produce the wave in tutorial 1.
The gain of SawOsc is reduced by a factor of 2 (gain is 0.5) and initial phase changed so it goes up for the entire period.
The gain of SawOsc goes from -1 to +1, during a period. Changing the gain we go from -.5 to .5. If we add a step of 0.5, we get the desired wave.
# chuck30.py - SawOsc as phasor SawOsc saw Step step # sawtooth oscillator + step of 0.5 connected to dac dac = step dac = saw # phasor frequency of 100 Hz, step of 0.5 saw.freq = 100 step.next = 0.5 # correct phase and gain saw.phase = 0.75 saw.gain = 0.5 # Play for 20 ms = 0.02 second (2 periods of 100-Hz) time(20::ms)
This is the wave, after running python createWav.py chuck30, on command line:
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