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# Copyright (c) 2010 John Glover, National University of Ireland, Maynooth
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import simpl
import numpy as np
def sine_wave(n, f=220, sr=44100):
s = simpl.zeros(n)
for i in range(n):
s[i] = np.sin(2.0 * np.pi * f * i/sr)
return s
def noisy_sine_wave(n, f=220, sr=44100):
s = simpl.zeros(n)
for i in range(n):
s[i] = np.sin(2*np.pi*f*i/sr) + (np.random.random() / 4)
return s
def sinechirpsine():
initial_freq = 220
final_freq = 440
amp = 0.5
section_length = 1 # seconds
sampling_rate = 44100
audio = simpl.zeros(section_length*sampling_rate*3)
chirp_freq = initial_freq
chirp_rate = (final_freq - initial_freq) / 2
for i in range(section_length*sampling_rate):
t = float(i) / sampling_rate
audio[i] = amp * np.sin(2 * np.pi * initial_freq * t)
audio[i+(section_length*sampling_rate)] = amp * np.sin(2 * np.pi * (initial_freq*t + chirp_rate*t*t))
audio[i+(section_length*sampling_rate*2)] = amp * np.sin(2 * np.pi * final_freq * t)
return audio
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