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- adjvolume(samples, factor=0.75)
- Adjust the amplitude of entire sample uniformly.
pre: factor > 0
post: Every sample in samples has been multiplied by factor.
note: factor > 1.0 amplifies while factor < 1.0 decreases volume.
- fadeout(samples, decaytime=0.5, SAMPLERATE=44100)
- Exponential taper of signal amplitude
pre: decaytime > 0
post: Values in samples have been decreased with increasing
damping from the begining to end. The rate of damping is
determined by decaytime, which is the half-life of the
amplitude. So the sample at decaytime is reduced by .5, the
sample at 2*decaytime is reduced by .25, etc.
- playsound = _play_sound_linux(samples)
- Play sound on Linux system
pre: samples is a list representing a valid sound sample.
post: The sound has been piped to an external process for playback.
Note: This should work on any Linux system using ALSA.
- sawtoothwave(t)
- Standard periodic sawtooth wave generator.
pre: t >= 0
post: returns amplitude of standard sawtooth wave at time t.
(0.0 at t=0, rises to 1 near t=pi,
-1.0 at t=pi, rises to 0.0 at t=tau)
- sinewave(t)
- standard periodic sine wave generator
- squarewave(t)
- Standard periodic square wave generator.
pre: t >= 0
post: returns amplitude of standard square wave at time t.
(1.0 for 0 <= t < pi and -1.0 for pi <= t < 2*pi)
- test()
- tone(wavefn=<function sinewave at 0x7fa34f5cbb80>, freq=440, duration=1, amp=1)
- Create a tone with given characteristics
params: wavefn is a standard wave function, frequency is in hz,
duration is in seconds, amplitude is a float in range
0..1.
returns a list of floats representing sequential samples of
a tone with the given waveform, frequency, duration,
and amplitude.
- trianglewave(t)
- Standard periodic triangle wave generator.
pre: t >= 0
post: returns amplitude of standard triangle wave at time t.
(0.0 at t=0, 1.0 at t=pi/2, 0.0 at t=pi, -1.0 at t=1.5*pi)
- whitenoise(t)
- White noise "wave" generator
post: returns random value in range -1 to 1
- write_wavefile(samples, fname, SAMPLERATE=44100)
- Write sampled wave to a wav format sound file
pre: samples is a list representing a valid sound sample.
post: The sound information has been written to the file fname in
wav audio file format.
Note: This function wipes out any previous contents of file, fname.
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