1 files changed, 50 insertions, 0 deletions
diff --git a/tests/signals.py b/tests/signals.py
new file mode 100644
index 0000000..1ebf44e
--- /dev/null
+++ b/tests/signals.py
@@ -0,0 +1,50 @@
+# 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
+