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October 12, 2017 09:55
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| import scipy.signal | |
| def freq_hilbert(sig,Fs): | |
| """ Calcultes the instantaneous frequency based on the hilbert | |
| transform | |
| """ | |
| sigorig = sig | |
| sig = sig.real | |
| ts = 1.0/Fs | |
| hilb = scipy.signal.hilbert(sig) | |
| ampli = np.abs(hilb) | |
| norm = sig/ampli | |
| hilbnorm = scipy.signal.hilbert(norm) | |
| env = np.abs(hilbnorm) | |
| phase = np.unwrap(np.angle(hilbnorm)) | |
| #print 'phase1',phase | |
| phase = np.unwrap(np.angle(sigorig)) | |
| #print 'phase2',phase | |
| #exit() | |
| phasediff = np.append([0],np.diff(phase)) | |
| #print 'phasediff',phasediff | |
| freq = phasediff/(2*np.pi*ts) | |
| #freq = freq/(2*np.pi) | |
| return freq | |
| def freq_hilbert_phase(sig,Fs): | |
| """ Calcultes the instantaneous frequency based on the hilbert | |
| transform | |
| """ | |
| sigorig = sig | |
| sig = sig.real | |
| ts = 1.0/Fs | |
| hilb = scipy.signal.hilbert(sig) | |
| ampli = np.abs(hilb) | |
| norm = sig/ampli | |
| hilbnorm = scipy.signal.hilbert(norm) | |
| env = np.abs(hilbnorm) | |
| phase = np.unwrap(np.angle(hilbnorm)) | |
| #print 'phase1',phase | |
| phase = np.unwrap(np.angle(sigorig)) | |
| #print 'phase2',phase | |
| #exit() | |
| phasediff = np.append([0],np.diff(phase)) | |
| #print 'phasediff',phasediff | |
| freq = phasediff/(2*np.pi*ts) | |
| #freq = freq/(2*np.pi) | |
| return freq |
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