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#!/usr/bin/python
# based on : www.daniweb.com/code/snippet263775.html
# from https://stackoverflow.com/questions/33879523/python-how-can-i-generate-a-wav-file-with-beeps
import math
import wave
import struct
# Audio will contain a long list of samples (i.e. floating point numbers describing the
# waveform). If you were working with a very long sound you'd want to stream this to
# disk instead of buffering it all in memory list this. But most sounds will fit in
# memory.
audio = []
sample_rate = 48000.0
phase = 0
def append_silence(duration_milliseconds=500):
num_samples = duration_milliseconds * (sample_rate / 1000.0)
for x in range(int(num_samples)):
audio.append(0.0)
return
def append_sinewave(
freq=440.0,
duration_milliseconds=500,
volume=1.0):
global phase
num_samples = duration_milliseconds * (sample_rate / 1000.0)
pc = math.tau * freq / sample_rate
for x in range(int(num_samples)):
phase += pc
audio.append(volume * math.sin(phase))
def append_squarewave(
freq=440.0,
duration_milliseconds=500,
volume=1.0):
global audio
num_samples = duration_milliseconds * (sample_rate / 1000.0)
samples_per_toggle = math.floor(sample_rate / freq)
for x in range(int(num_samples)):
on = math.floor(x / samples_per_toggle) % 2
audio.append(volume * on)
def save_wav(file_name):
wav_file=wave.open(file_name,"w")
nchannels = 1
sampwidth = 2
nframes = len(audio)
comptype = "NONE"
compname = "not compressed"
wav_file.setparams((nchannels, sampwidth, sample_rate, nframes, comptype, compname))
for sample in audio:
wav_file.writeframes(struct.pack('h', int( sample * 32767.0 )))
wav_file.close()
return
import random
freq = 6
for i in range(160):
append_sinewave(volume=1.0, freq=math.exp(freq), duration_milliseconds=50)
freq += random.uniform(-0.2, 0.2)
freq = max(4.5, min(freq, 9))
save_wav("output.wav")