Added frequency sweep, gaussian pulse and pwm modulation arbitrary wa…

…veform genearion python scripts.

scripts/frequency-sweep.py

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+#!/bin/env python
+
+# generata a frequency sweep
+
+import numpy as np
+from scipy.signal import chirp
+import matplotlib.pyplot as plt
+
+showplot = False
+t = np.linspace(0, 1, 2048)
+waveform = chirp(t, f0=1, f1=50, t1=1, method='linear')
+
+print("# frequency sweep using scipy.signal.chirp")
+for y in waveform:
+    print(y)
+
+if showplot:
+    plt.plot(t, waveform, '--')
+    plt.show()
+

scripts/gaussian-pulse.py

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+#!/bin/env python
+
+# generata a gaussian pulse
+
+import numpy as np
+from scipy.signal import gausspulse
+import matplotlib.pyplot as plt
+
+showplot = False
+t = np.linspace(-1, 1, 2048)
+waveform = gausspulse(t, fc=5)
+
+print("# gaussian pulse using scipy.signal.gausspulse")
+for y in waveform:
+    print(y)
+
+if showplot:
+    plt.plot(t, waveform, '--')
+    plt.show()
+

scripts/pwm-modulation.py

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+#!/bin/env python
+
+# generata pwm modulated signal
+
+import numpy as np
+from scipy.signal import square
+import matplotlib.pyplot as plt
+
+showplot = False
+t = np.linspace(0, 1, 2048)
+sig = np.sin(2 * np.pi * t)
+waveform = square(2 * np.pi * 25 * t, duty=(sig + 1)/2)
+
+print("# pwm modulation using scipy.signal.square")
+for y in waveform:
+    print(y)
+
+if showplot:
+    plt.plot(t, waveform, '--')
+    plt.show()
+