def get_filter_banks(filters_num,
NFFT,
samplerate,
low_freq=0,
high_freq=None):
''' Mel Bank
filers_num: filter numbers
NFFT:points of your FFT
samplerate:sample rate
low_freq: the lowest frequency that mel frequency include
high_freq:the Highest frequency that mel frequency include
'''
#turn the hz scale into mel scale
low_mel = hz2mel(low_freq)
high_mel = hz2mel(high_freq)
#in the mel scale, you should put the position of your filter number
mel_points = np.linspace(low_mel, high_mel, filters_num + 2)
#get back the hzscale of your filter position
hz_points = mel2hz(mel_points)
#Mel triangle bank design
center = np.floor((NFFT + 1) * hz_points / samplerate)
fbank = np.zeros([filters_num, int(NFFT / 2 + 1)])
for i in range(0, filters_num):
start = int(center[i])
end = int(center[i + 2])
tri_wid = end - start
tri_fil = sg.bartlett(tri_wid, sym=False)
fbank[i][start:end] = tri_fil
return fbank
def Bartlett (N,x):
ventana = sig.bartlett(N)
salida = np.multiply(x,ventana)
return salida
def __window_data(data):
# Apply window function to the decoded data & store as new key:value pair in dictionary
# Parameters: data: [{'frame_data': string,
# 'frame_count': int,
# 'frame_time': float,
# 'frame_position': int,
# 'frame_decoded': numpy.ndarray}, ...]
# cache window function
if 'hann' == config_analysis.frame_window:
window = signal.hann(config_audio.frames_per_buffer)
elif 'hamming' == config_analysis.frame_window:
window = signal.hamming(config_audio.frames_per_buffer)
elif 'blackman' == config_analysis.frame_window:
window = signal.blackman(config_audio.frames_per_buffer)
elif 'bartlett' == config_analysis.frame_window:
window = signal.bartlett(config_audio.frames_per_buffer)
elif 'barthann' == config_analysis.frame_window:
window = signal.barthann(config_audio.frames_per_buffer)
else:
# window function unavailable
return
# apply specified window function in config
for i in range(len(data)):
data[i]['frame_windowed'] = data[i]['frame_decoded'][:] * window
def plot_specgram(ax, data, fs, nfft=256, noverlap=128, window='hann',
cmap='jet', interpolation='bilinear', rasterized=True):
if window not in SPECGRAM_WINDOWS:
raise ValueError("Window not supported")
elif window == "boxcar":
mwindow = signal.boxcar(nfft)
elif window == "hamming":
mwindow = signal.hamming(nfft)
elif window == "hann":
mwindow = signal.hann(nfft)
elif window == "bartlett":
mwindow = signal.bartlett(nfft)
elif window == "blackman":
mwindow = signal.blackman(nfft)
elif window == "blackmanharris":
mwindow = signal.blackmanharris(nfft)
specgram, freqs, time = mlab.specgram(data, NFFT=nfft, Fs=fs,
window=mwindow,
noverlap=noverlap)
specgram = 10 * np.log10(specgram[1:, :])
specgram = np.flipud(specgram)
freqs = freqs[1:]
halfbin_time = (time[1] - time[0]) / 2.0
halfbin_freq = (freqs[1] - freqs[0]) / 2.0
extent = (time[0] - halfbin_time, time[-1] + halfbin_time,
freqs[0] - halfbin_freq, freqs[-1] + halfbin_freq)
ax.imshow(specgram, cmap=cmap, interpolation=interpolation,
extent=extent, rasterized=rasterized)
ax.axis('tight')
def win_sel(win_str, win_size):
"""
Function returns a window vector based on window name.
Note class can only use windows found in scipy.signal library.
"""
overlap = 0
if (win_str == 'blackmanharris'):
win = sig.blackmanharris(win_size)
overlap = .75
elif (win_str == 'blackman'):
win = sig.blackman(win_size)
elif (win_str == 'bartlett'):
win = sig.bartlett(win_size)
elif (win_str == 'hamming'):
win = sig.hamming(win_size)
elif (win_str == 'hanning'):
win = sig.hanning(win_size)
elif (win_str == 'hann'):
win = sig.hann(win_size)
elif (win_str == 'barthann'):
win = sig.barthann(win_size)
elif (win_str == 'triang'):
win = sig.triang(win_size)
elif (win_str == 'rect' or win_str == None):
win = np.ones(win_size)
else:
print('Invalid Window Defined')
return -1
return win, overlap
def td_dft(dat, winlen=4096, winoverlap=2048, dftsize=4096, winty='blackman'):
# calculate the views
views = view_as_windows(dat,winlen,winlen-winoverlap)
# generate desired window
if winty == 'rect':
win = np.ones(winlen)
elif winty == 'bartlett':
win = bartlett(winlen)
elif winty == 'hann':
win = hanning(winlen)
elif winty == 'hamming':
win = hamming(winlen)
elif winty == 'blackman':
win = blackman(winlen)
else:
assert False # invalid winty
# apply window sequence to views
views = [ v*win for v in views ]
# computes time aliasing to input sequences if needed
if winlen > dftsize:
views = [ time_alias(v,dftsize) for v in views ]
# apply fft and fftshift to all views
dfts = [ fftshift(fft(v,dftsize)) for v in views ]
return np.array(dfts)
def spectrum_wwind(array, time, window='hanning'): # time should be in seconds
# Size of array
Nw = array.shape[0]
# Calculate time step (assumed to be in seconds)
dt = time[1] - time[0]
# prefactor
# print 'dt = ',dt
prefactor = dt
# Calculate array of frequencies, shift
w = np.fft.fftfreq(Nw, dt)
w0 = np.fft.fftshift(w)
# make window
# blackman window
if window == 'blackman':
bwin = blackman(Nw) # pretty good
if window == 'hanning':
bwin = hanning(Nw) # pretty good
if window == 'hamming':
bwin = hamming(Nw) # not as good
if window == 'bartlett':
bwin = bartlett(Nw) # pretty good
if window == 'kaiser':
bwin = kaiser(Nw, 6)
if window == 'None':
bwin = 1.0
# Calculate FFT
aw = prefactor * np.fft.fft(array * bwin)
aw0 = np.fft.fftshift(aw)
# Calcuate Phase
phase = np.angle(aw)
phase0 = np.fft.fftshift(phase)
# Adjust arrays if not div by 2
if not np.mod(Nw, 2):
w0 = np.append(w0, -w0[0])
aw0 = np.append(aw0, -aw0[0])
phase0 = np.append(phase0, -phase0[0])
# Cut FFTs in half
Nwi = Nw // 2
w2 = w0[Nwi:]
aw2 = aw0[Nwi:]
phase2 = phase0[Nwi:]
comp = aw
pwr = (np.abs(aw2))**2
pwr2 = (np.abs(aw))**2
mag = np.sqrt(pwr)
cos_phase = np.cos(phase2)
freq = w2
freq2 = w
return freq, freq2, comp, pwr, mag, phase2, cos_phase, dt
def filtering_bartlett(sig, win_size):
win = signal.bartlett(win_size)
win = map(lambda x: float(x), win)
sig = map(lambda x: float(x), sig)
win = list(win)
sig = list(sig)
filtered = signal.convolve(sig, win, mode='same') / sum(win)
return filtered
def recompute_window(self):
zoom = int(self.width * (self.get_eff_sample_rate()) / self.zoom_fac)
if self.filter == 'kaiser':
self.window = signal.kaiser(
freqshow.SDR_SAMPLE_SIZE,
self.kaiser_beta,
False,
)[0:zoom +
2] # for every bin there is a window the same exact size as the read samples.
elif self.filter == 'boxcar':
self.window = signal.boxcar(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'hann':
self.window = signal.hann(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'hamming':
self.window = signal.hamming(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'blackman':
self.window = signal.blackman(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'blackmanharris':
self.window = signal.blackmanharris(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'bartlett':
self.window = signal.bartlett(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'barthann':
self.window = signal.barthann(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'nuttall':
self.window = signal.nuttall(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
else:
self.window = 1
def mkWindow(com,N):
if com == "hm":
win = sg.hamming(N)
elif com == "hn":
win = sg.hann(N)
elif com == "bk":
win = sg.blackman(N)
elif com == "ga":
win = sg.gaussian(N,N/16)
elif com == "bar":
win = sg.bartlett(N)
elif com == "rect":
win = np.ones(N)
else :
usage()
return win
def plot_specgram(ax,
data,
fs,
nfft=256,
noverlap=128,
window='hann',
cmap='jet',
interpolation='bilinear',
rasterized=True):
if window not in SPECGRAM_WINDOWS:
raise ValueError("Window not supported")
elif window == "boxcar":
mwindow = signal.boxcar(nfft)
elif window == "hamming":
mwindow = signal.hamming(nfft)
elif window == "hann":
mwindow = signal.hann(nfft)
elif window == "bartlett":
mwindow = signal.bartlett(nfft)
elif window == "blackman":
mwindow = signal.blackman(nfft)
elif window == "blackmanharris":
mwindow = signal.blackmanharris(nfft)
specgram, freqs, time = mlab.specgram(data,
NFFT=nfft,
Fs=fs,
window=mwindow,
noverlap=noverlap)
specgram = 10 * np.log10(specgram[1:, :])
specgram = np.flipud(specgram)
freqs = freqs[1:]
halfbin_time = (time[1] - time[0]) / 2.0
halfbin_freq = (freqs[1] - freqs[0]) / 2.0
extent = (time[0] - halfbin_time, time[-1] + halfbin_time,
freqs[0] - halfbin_freq, freqs[-1] + halfbin_freq)
ax.imshow(specgram,
cmap=cmap,
interpolation=interpolation,
extent=extent,
rasterized=rasterized)
ax.axis('tight')
# plt.plot(T,Lt+Zt,color=crta[j],alpha = 0.95,label=r'skupaj $\Delta t=$'+str(dt))#+'{:.{}f}'.format(SHfi, 3 ))
# plt.xscale('log')
plt.yscale('log')
plt.ylabel('PSD($\omega$)', fontsize=16)
plt.xlabel(r'$\omega$', fontsize=16)
plt.xlim([0, len(SIG) / 2])
# plt.ylim([0,250])
# plt.title('Umiranje populacije za različne korake in razlicno velika vzorca')#+'(N='+str(N)+',M='+str(M)+')')
plt.legend(loc=0)
###############################################################################
################ okenske funkcije in odzivi #################################
###############################################################################
windowGauss = signal.gaussian(51, std=6)
windowBartt = signal.bartlett(51)
windowHann = signal.hann(51)
windowCH = signal.chebwin(51, at=100)
windowTuR = signal.tukey(51)
AGauss = np.fft.fft(windowGauss, 2048) / (len(windowGauss) / 2.0)
ABartt = np.fft.fft(windowBartt, 2048) / (len(windowBartt) / 2.0)
AHann = np.fft.fft(windowHann, 2048) / (len(windowHann) / 2.0)
ACH = np.fft.fft(windowCH, 2048) / (len(windowCH) / 2.0)
ATuR = np.fft.fft(windowTuR, 2048) / (len(windowTuR) / 2.0)
freqGauss = np.linspace(-0.5, 0.5, len(AGauss))
freqBartt = np.linspace(-0.5, 0.5, len(ABartt))
freqHann = np.linspace(-0.5, 0.5, len(AHann))
freqCH = np.linspace(-0.5, 0.5, len(ACH))
freqTuR = np.linspace(-0.5, 0.5, len(ATuR))
example demonstrates the spectral leakage for several different windows (including the boxcar): """ fig02 = plt.figure() # Boxcar with zeroed out fraction b = sig.boxcar(npts) zfrac = 0.15 zi = int(npts * zfrac) b[:zi] = b[-zi:] = 0 name = "Boxcar - zero fraction=%.2f" % zfrac winspect(b, fig02, name) winspect(sig.hanning(npts), fig02, "Hanning") winspect(sig.bartlett(npts), fig02, "Bartlett") winspect(sig.barthann(npts), fig02, "Modified Bartlett-Hann") """ .. image:: fig/multi_taper_spectral_estimation_02.png As before, the left figure displays the windowing function in the temporal domain and the figure on the left displays the attentuation of spectral leakage in the other frequency bands in the spectrum. Notice that though different windowing functions have different spectral attenuation profiles, trading off attenuation of leakage from frequency bands near the frequency of interest (narrow-band leakage) with leakage from faraway frequency bands (broad-band leakage) they are all superior in both of these respects to the boxcar window used in the naive periodogram.
# Plot the window and its frequency response:
from scipy import signal
from scipy.fftpack import fft, fftshift
import matplotlib.pyplot as plt
window = signal.bartlett(51)
plt.plot(window)
plt.title("Bartlett window")
plt.ylabel("Amplitude")
plt.xlabel("Sample")
plt.figure()
A = fft(window, 2048) / (len(window)/2.0)
freq = np.linspace(-0.5, 0.5, len(A))
response = 20 * np.log10(np.abs(fftshift(A / abs(A).max())))
plt.plot(freq, response)
plt.axis([-0.5, 0.5, -120, 0])
plt.title("Frequency response of the Bartlett window")
plt.ylabel("Normalized magnitude [dB]")
plt.xlabel("Normalized frequency [cycles per sample]")
def test_basic(self):
assert_allclose(signal.bartlett(6), [0, 0.4, 0.8, 0.8, 0.4, 0])
assert_allclose(signal.bartlett(7), [0, 1/3, 2/3, 1.0, 2/3, 1/3, 0])
assert_allclose(signal.bartlett(6, False),
[0, 1/3, 2/3, 1.0, 2/3, 1/3])
def test_basic(self):
assert_allclose(signal.bartlett(6), [0, 0.4, 0.8, 0.8, 0.4, 0])
assert_allclose(signal.bartlett(7), [0, 1/3, 2/3, 1.0, 2/3, 1/3, 0])
assert_allclose(signal.bartlett(6, False),
[0, 1/3, 2/3, 1.0, 2/3, 1/3])
from scipy import signal
from matplotlib import pyplot as plt
from matplotlib import style
import mysignals as sigs
import numpy as np
from scipy.fftpack import fft, fftshift
window = signal.bartlett(51)
plt.plot(window)
plt.title("Bartlett Window")
plt.ylabel("Amplitude")
plt.xlabel("Sample")
plt.show()
#frequency response
plt.figure()
A = fft(window, 2048) / (len(window) / 2.0)
freq = np.linspace(-0.5, 0.5, len(A))
response = 20 * np.log10(np.abs(fftshift(A / abs(A).max())))
plt.plot(freq, response)
plt.axis([-0.5, 0.5, -120, 0])
plt.title("Frequency Response of Bartlett Window")
plt.ylabel("Normalized Magnitude(dB)")
plt.xlabel("Normalized Frequency in cycles/sample")
plt.show()
(including the boxcar): """ fig02 = plt.figure() # Boxcar with zeroed out fraction b = sig.boxcar(npts) zfrac = 0.15 zi = int(npts * zfrac) b[:zi] = b[-zi:] = 0 name = 'Boxcar - zero fraction=%.2f' % zfrac winspect(b, fig02, name) winspect(sig.hanning(npts), fig02, 'Hanning') winspect(sig.bartlett(npts), fig02, 'Bartlett') winspect(sig.barthann(npts), fig02, 'Modified Bartlett-Hann') """ .. image:: fig/multi_taper_spectral_estimation_02.png As before, the left figure displays the windowing function in the temporal domain and the figure on the left displays the attentuation of spectral leakage in the other frequency bands in the spectrum. Notice that though different windowing functions have different spectral attenuation profiles, trading off attenuation of leakage from frequency bands near the frequency of interest (narrow-band leakage) with leakage from faraway frequency bands (broad-band leakage) they are all superior in both of these respects to the boxcar window used in the naive periodogram. Another approach which deals with both the inefficiency problem and with the
f0 = fs / 4
p0 = 0 # radianes
a0 = 2 # Volts
df = np.random.uniform(-2, 2, k)
fn = f0 + df * fs / N
Ts = 1 / fs
tt = np.linspace(0, (N - 1) * Ts, N)
x = np.transpose(np.vstack([a0 * np.sin(2 * np.pi * ff * tt) for ff in fn]))
ventana = [
sig.boxcar(N),
sig.bartlett(N),
sig.hann(N),
sig.blackman(N),
sig.flattop(N)
]
V = len(ventana)
sesgo = np.zeros(V)
var = np.zeros(V)
prom = np.zeros(V)
dist = np.zeros((k, V))
for (vv, this_win) in zip(range(V), ventana):
X = np.transpose(np.vstack([x[:, kk] * this_win for kk in range(0, k)]))
X = fft(X, axis=0)
barva = ['r', 'b', 'g', 'k', 'm', 'y', 'c'] DIR = '/home/jernej/Desktop/ModelskaAn/MOJEDELLO/dvanajsta/' val = ["val2", "val3"] V = 1 SIG = loadtxt(DIR + val[V] + ".dat") # branje LS = len(SIG) # dolžina signala SIG_256 = SIG[0:LS // 2] SIG_128 = SIG[0:LS // 4] SIG_64 = SIG[0:LS // 8] STD = 7 windowGauss = signal.gaussian(LS, std=STD) windowBartt = signal.bartlett(LS) windowHann = signal.hann(LS) windowCH = signal.chebwin(LS, at=100) windowTuR = signal.tukey(LS) FTSIG = 2 * abs(np.fft.fft(SIG))**2 FTfreq = np.fft.fftfreq(LS, 1 / len(SIG)) FTSIG_G = 2 * abs(np.fft.fft(SIG * signal.gaussian(LS, std=STD)))**2 FTSIG_B = 2 * abs(np.fft.fft(SIG * signal.bartlett(LS)))**2 FTSIG_H = 2 * abs(np.fft.fft(SIG * signal.hann(LS)))**2 FTSIG_CH = 2 * abs(np.fft.fft(SIG * signal.chebwin(LS, at=100)))**2 FTSIG_T = 2 * abs(np.fft.fft(SIG * signal.tukey(LS)))**2 FTSIG_HCH = 2 * abs(np.fft.fft(SIG * signal.tukey(LS) * signal.hann(LS)))**2 FTSIG_256 = 2 * abs(np.fft.fft(SIG_256))**2 FTfreq_256 = np.fft.fftfreq(LS // 2, 1 / len(SIG_256))
def remix_solo(x):
""" The core method to analyse, separate, estimate, remix and reconstruct audio mixtures and sources.
Args:
x : (2D ndarray) The two-channel mixture time domain waveform
Returns:
x : (2D ndarray) The two-channel mixture time domain waveform
yhat : (array) Single channel solo instrument time domain waveform
yhatb : (2D ndarray) The two-channel accompanying instruments time domain waveform
ymix : (2D ndarray) The two-channel remixed time domain waveform
"""
# Load models using pickle
print('Loading models')
# Check for os, to avoid some windows crushes
plat = sys.platform
if plat == 'linux' or plat == 'linux2' or plat == 'darwin':
ww = pickle.load(open('solo_suppression_mag.p', 'rb'),
encoding='latin1')
# ww = pickle.load(open('solo_suppression_mag.p', 'rb'))
wwpan = pickle.load(open('pannet_mag.p', 'rb'), encoding='latin1')
# wwpan = pickle.load(open('pannet_mag.p', 'rb'))
else:
fileA = open('solo_suppression_mag.p', 'rb')
ww = pickle.load(fileA, encoding='latin1')
fileB = open('pannet_mag.p', 'rb')
wwpan = pickle.load(fileB, encoding='latin1')
del fileA, fileB
hop = 512
N = 4096
wsz = 2049
# Left/Right/Mid Analysis
xL = x[:, 0]
xR = x[:, 1]
MmX, MpX = TF.STFT((xL + xR) * 0.5, sig.bartlett(wsz, True), N, hop)
LmX, LpX = TF.STFT(xL, sig.bartlett(wsz, True), N, hop)
RmX, RpX = TF.STFT(xR, sig.bartlett(wsz, True), N, hop)
print('Extracting Solo Information')
### Hidden Layer Representation 1
Trs = sigmoid(np.dot(MmX, ww[2]) + ww[3])
act = relu(np.dot(MmX, ww[0]) + ww[1])
act *= Trs
hl = act + (1. - Trs) * MmX
### Hidden Layer Representation 2
Trs = sigmoid(np.dot(hl, ww[6]) + ww[7])
act = relu(np.dot(hl, ww[4]) + ww[5])
act *= Trs
hl = act + (1. - Trs) * hl
### Hidden Layer Representation 3
Trs = sigmoid(np.dot(hl, ww[10]) + ww[11])
act = relu(np.dot(hl, ww[8]) + ww[9])
act *= Trs
hl = act + (1. - Trs) * hl
### Hidden Layer Representation 4
Trs = sigmoid(np.dot(hl, ww[14]) + ww[15])
act = relu(np.dot(hl, ww[12]) + ww[13])
act *= Trs
hl = act + (1. - Trs) * hl
### Output Layer
Trs = sigmoid(np.dot(hl, ww[18]) + ww[19])
act = relu(np.dot(hl, ww[16]) + ww[17])
act *= Trs
hl = ((act + (1. - Trs) * hl) + eps)
# Monophonic Solo
yhat = TF.iSTFT(hl, MpX, wsz, hop)
# Stereo instrumentation
print('Estimating accompaniment instrumentation')
mask = fm(LmX,
hl, [(LmX - hl).clip(0.)], [], [],
alpha=1.3,
method='alphaWiener')
mshatL = mask(reverse=True)
mask = fm(RmX,
hl, [(RmX - hl).clip(0.)], [], [],
alpha=1.3,
method='alphaWiener')
mshatR = mask(reverse=True)
# Time-domain reconstruction
yhatbL = TF.iSTFT(mshatL, LpX, wsz, hop)
yhatbR = TF.iSTFT(mshatR, RpX, wsz, hop)
yhatb = np.vstack((yhatbL, yhatbR)).T
# Mixing coefficients Estimation
print('Estimating Mixing Coefficients')
### Hidden Layer Representation 1
Trs = sigmoid(np.dot(hl, wwpan[2]) + wwpan[3])
act = relu(np.dot(hl, wwpan[0]) + wwpan[1])
act *= Trs
hl = act + (1. - Trs) * hl
### Hidden Layer Representation 2
Trs = sigmoid(np.dot(hl, wwpan[6]) + wwpan[7])
act = relu(np.dot(hl, wwpan[4]) + wwpan[5])
act *= Trs
hl = act + (1. - Trs) * hl
mix_vec = softmax(np.dot(hl, wwpan[8]) + wwpan[9])
mix_vec = np.sum(mix_vec, axis=0)
# Acquiring locations
degloc = np.argmax(mix_vec[19:])
gloc = np.argmax(mix_vec[:19])
mix_vec = np.zeros((40, 1), dtype=np.float32)
mix_vec[degloc + 19] = 1.
mix_vec[gloc] = 1.
print('Performing Mixing')
degrees, gain = vec2val(mix_vec)
LGenv, RGenv = pan_gain_env(yhat, degrees, gain)
ymix = np.vstack((yhat * LGenv, yhat * RGenv)).T + yhatb
return x, yhat[:x.shape[0]], yhatb[:x.shape[0], :], ymix[:x.shape[0], :]
# -*- coding: utf-8 -*-
"""
Created on Tue Oct 22 00:54:03 2019
@author: fede
"""
import matplotlib as mpl
import matplotlib.pyplot as plt
import numpy as np
from numpy.fft import fft, fftshift
import scipy.signal as sig
N = 60 # muestras
fftSize = 2048
ventanas = [sig.boxcar(N), sig.bartlett(N), sig.hann(N), sig.blackman(N), sig.flattop(N)]
ventanas_names = ["rectangular", "bartlett", "hanning", "blackman", "flattop"]
V = len(ventanas_names)
plt.figure("Ventanas", figsize = (10,10))
for (vv, this_win) in zip(ventanas_names, ventanas):
plt.plot(this_win, label=vv)
plt.legend()
plt.grid()
plt.xlabel("Numero de muestra")
plt.ylabel("Amplitud de la ventana")
plt.title("Forma de ventanas")
complexMat = np.transpose(np.vstack([fft(thisWin,fftSize, axis=0) for thisWin in ventanas]))
#fft(signal, size) Si size > len(signal) la FFT le hace zero padding automaticamente :)
def bartlett(self, delta_w):
m = int(np.ceil((8 * np.pi) / (2 * delta_w))) + 1
if m % 2 == 0:
m = m + 1
w = signal.bartlett(m)
return w
center = int(np.floor(N / 2))
modX = modX[center:N]
modX = 20 * np.log10(modX)
freq = np.linspace(0, 0.5, len(modX))
plt.plot(freq, modX)
plt.title("Rectangular", fontsize=20)
plt.xlim(0.2, 0.3)
plt.xlabel("Frecuencia normalizada", fontsize=20)
plt.ylabel("Amplitud en dB", fontsize=20)
plt.grid()
#########################
###ventana bartlett###
#########################
plt.figure("Bartlett")
rectWindow = sig.bartlett(N)
a2dB = -40
a2 = 10**(a2dB / 20)
x1 = np.sin(2 * np.pi * f1 * tt)
x2 = a2 * np.sin(2 * np.pi * f2 * tt)
x = x1 + x2
x = x * rectWindow
X = fft(x)
modX = np.abs(fftshift(X)) * 2 / N
center = int(np.floor(N / 2))
modX = modX[center:N]
modX = 20 * np.log10(modX)
freq = np.linspace(0, 0.5, len(modX))
plt.plot(freq, modX)
plt.title("Bartlett", fontsize=20)
def get_data(self):
"""Get spectrogram data from the tuner. Will return width number of
values which are the intensities of each frequency bucket (i.e. FFT of
radio samples).
"""
# Get width number of raw samples so the number of frequency bins is
# the same as the display width. Add two because there will be mean/DC
# values in the results which are ignored. Increase by 1/self.zoom_fac if needed
if self.zoom_fac < (self.sdr.sample_rate / 1000000):
zoom = int(self.width *
((self.sdr.sample_rate / 1000000) / self.zoom_fac))
else:
zoom = self.width
self.zoom_fac = self.get_sample_rate()
if zoom < freqshow.SDR_SAMPLE_SIZE:
freqbins = self.sdr.read_samples(freqshow.SDR_SAMPLE_SIZE)[0:zoom +
2]
else:
zoom = self.width
self.zoom_fac = self.get_sample_rate()
freqbins = self.sdr.read_samples(freqshow.SDR_SAMPLE_SIZE)[0:zoom +
2]
# Apply a window function to the sample to remove power in sample sidebands before the fft.
if self.filter == 'kaiser':
window = signal.kaiser(
freqshow.SDR_SAMPLE_SIZE,
self.kaiser_beta,
False,
)[0:zoom +
2] # for every bin there is a window the same exact size as the read samples.
elif self.filter == 'boxcar':
window = signal.boxcar(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'hann':
window = signal.hann(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'hamming':
window = signal.hamming(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'blackman':
window = signal.blackman(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'blackmanharris':
window = signal.blackmanharris(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'bartlett':
window = signal.bartlett(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'barthann':
window = signal.barthann(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
elif self.filter == 'nuttall':
window = signal.nuttall(
freqshow.SDR_SAMPLE_SIZE,
False,
)[0:zoom + 2]
else:
window = 1
samples = freqbins * window
# Run an FFT and take the absolute value to get frequency magnitudes.
freqs = np.absolute(fft(samples))
# Ignore the mean/DC values at the ends.
freqs = freqs[1:-1]
# Reverse the order of the freqs array if swaping I and Q
if self.swap_iq == True:
freqs = freqs[::-1]
# Shift FFT result positions to put center frequency in center.
freqs = np.fft.fftshift(freqs)
# Truncate the freqs array to the width of the screen if neccesary.
if freqs.size > self.width:
freq_step = self.get_freq_step(
) # Get the frequency step in Hz between pixels.
shiftsweep = int(self.get_lo_offset() * 1000000 /
freq_step) # LO offset in pixels.
extra_samples = int(
(freqs.size - self.width) / 2
) # The excess samples either side of the display width in pixels.
if extra_samples > abs(
shiftsweep
): # check if there is room to shift the array by the LO offset.
if self.get_swap_iq() == True:
lextra = extra_samples + shiftsweep
elif self.get_swap_iq() == False:
lextra = extra_samples - shiftsweep
else:
lextra = extra_samples
rextra = freqs.size - (lextra + self.width)
freqs = freqs[lextra:-rextra]
# Convert to decibels.
freqs = 20.0 * np.log10(freqs)
# Get signal strength of the center frequency.
# for i in range ( 1, 11):
# self.sig_strength = (self.get_sig_strength() + freqs[((zoom+2)/2)+i-5])
# self.sig_strength = self.get_sig_strength()/10
# Update model's min and max intensities when auto scaling each value.
if self.min_auto_scale:
min_intensity = np.min(freqs)
self.min_intensity = min_intensity if self.min_intensity is None \
else min(min_intensity, self.min_intensity)
if self.max_auto_scale:
max_intensity = np.max(freqs)
self.max_intensity = max_intensity if self.max_intensity is None \
else max(max_intensity, self.max_intensity)
# Update intensity range (length between min and max intensity).
self.range = self.max_intensity - self.min_intensity
# Return frequency intensities.
return freqs
def remix_solo(x):
""" The core method to analyse, separate, estimate, remix and reconstruct audio mixtures and sources.
Args:
x : (2D ndarray) The two-channel mixture time domain waveform
Returns:
x : (2D ndarray) The two-channel mixture time domain waveform
yhat : (array) Single channel solo instrument time domain waveform
yhatb : (2D ndarray) The two-channel accompanying instruments time domain waveform
ymix : (2D ndarray) The two-channel remixed time domain waveform
"""
# Load models using pickle
print('Loading models')
# Check for os, to avoid some windows crushes
plat = sys.platform
if plat == 'linux' or plat == 'linux2' or plat == 'darwin' :
ww = pickle.load(open('solo_suppression_mag.p', 'rb'))
wwpan = pickle.load(open('pannet_mag.p', 'rb'))
else :
fileA = open('solo_suppression_mag.p', 'rb')
ww = pickle.load(fileA,encoding='latin1')
fileB = open('pannet_mag.p', 'rb')
wwpan = pickle.load(fileB,encoding='latin1')
del fileA, fileB
hop = 512
N = 4096
wsz = 2049
# Left/Right/Mid Analysis
xL = x[:, 0]
xR = x[:, 1]
MmX, MpX = TF.STFT((xL+xR) * 0.5, sig.bartlett(wsz, True), N, hop)
LmX, LpX = TF.STFT(xL, sig.bartlett(wsz, True), N, hop)
RmX, RpX = TF.STFT(xR, sig.bartlett(wsz, True), N, hop)
print('Extracting Solo Information')
### Hidden Layer Representation 1
Trs = sigmoid(np.dot(MmX, ww[2]) + ww[3])
act = relu(np.dot(MmX, ww[0]) + ww[1])
act *= Trs
hl = act + (1. - Trs) * MmX
### Hidden Layer Representation 2
Trs = sigmoid(np.dot(hl, ww[6]) + ww[7])
act = relu(np.dot(hl, ww[4]) + ww[5])
act *= Trs
hl = act + (1. - Trs) * hl
### Hidden Layer Representation 3
Trs = sigmoid(np.dot(hl, ww[10]) + ww[11])
act = relu(np.dot(hl, ww[8]) + ww[9])
act *= Trs
hl = act + (1. - Trs) * hl
### Hidden Layer Representation 4
Trs = sigmoid(np.dot(hl, ww[14]) + ww[15])
act = relu(np.dot(hl, ww[12]) + ww[13])
act *= Trs
hl = act + (1. - Trs) * hl
### Output Layer
Trs = sigmoid(np.dot(hl, ww[18]) + ww[19])
act = relu(np.dot(hl, ww[16]) + ww[17])
act *= Trs
hl = ((act + (1. - Trs) * hl) + eps)
# Monophonic Solo
yhat = TF.iSTFT(hl, MpX, wsz, hop)
# Stereo instrumentation
print('Estimating accompaniment instrumentation')
mask = fm(LmX, hl, [(LmX-hl).clip(0.)], [], [], alpha = 1.3, method = 'alphaWiener')
mshatL = mask(reverse = True)
mask = fm(RmX, hl, [(RmX-hl).clip(0.)], [], [], alpha = 1.3, method = 'alphaWiener')
mshatR = mask(reverse = True)
# Time-domain reconstruction
yhatbL = TF.iSTFT(mshatL, LpX, wsz, hop)
yhatbR = TF.iSTFT(mshatR, RpX, wsz, hop)
yhatb = np.vstack((yhatbL, yhatbR)).T
# Mixing coefficients Estimation
print('Estimating Mixing Coefficients')
### Hidden Layer Representation 1
Trs = sigmoid(np.dot(hl, wwpan[2]) + wwpan[3])
act = relu(np.dot(hl, wwpan[0]) + wwpan[1])
act *= Trs
hl = act + (1. - Trs) * hl
### Hidden Layer Representation 2
Trs = sigmoid(np.dot(hl, wwpan[6]) + wwpan[7])
act = relu(np.dot(hl, wwpan[4]) + wwpan[5])
act *= Trs
hl = act + (1. - Trs) * hl
mix_vec = softmax(np.dot(hl, wwpan[8]) + wwpan[9])
mix_vec = np.sum(mix_vec, axis=0)
# Acquiring locations
degloc = np.argmax(mix_vec[19:])
gloc = np.argmax(mix_vec[:19])
mix_vec = np.zeros((40,1), dtype = np.float32)
mix_vec[degloc + 19] = 1.
mix_vec[gloc] = 1.
print('Performing Mixing')
degrees, gain = vec2val(mix_vec)
LGenv, RGenv = pan_gain_env(yhat, degrees, gain)
ymix = np.vstack((yhat * LGenv, yhat * RGenv)).T + yhatb
return x, yhat[:x.shape[0]], yhatb[:x.shape[0], :], ymix[:x.shape[0], :]
example demonstrates the spectral leakage for several different windows (including the boxcar): """ fig02 = plt.figure() # Boxcar with zeroed out fraction b = sig.boxcar(npts) zfrac = 0.15 zi = int(npts*zfrac) b[:zi] = b[-zi:] = 0 name = 'Boxcar - zero fraction=%.2f' % zfrac winspect(b, fig02, name) winspect(sig.hanning(npts), fig02, 'Hanning') winspect(sig.bartlett(npts), fig02, 'Bartlett') winspect(sig.barthann(npts), fig02, 'Modified Bartlett-Hann') """ .. image:: fig/multi_taper_spectral_estimation_02.png As before, the left figure displays the windowing function in the temporal domain and the figure on the left displays the attentuation of spectral leakage in the other frequency bands in the spectrum. Notice that though different windowing functions have different spectral attenuation profiles, trading off attenuation of leakage from frequency bands near the frequency of interest (narrow-band leakage) with leakage from faraway frequency bands (broad-band leakage) they are all superior in both of these respects to the boxcar window used in the naive periodogram.
"""
import matplotlib.pyplot as plt
import numpy as np
import scipy.signal as sig
from scipy.fftpack import fft, fftshift
N = 1000
fs = 1000
Ts = 1 / fs
tt = np.linspace(0, (N - 1) * Ts, N)
ventanas = [
1,
sig.boxcar(N),
sig.bartlett(N),
sig.hann(N),
sig.blackman(N),
sig.flattop(N)
]
##Rect
d = 2.8
f1 = fs / 4 + 0.5 * fs / N
f2 = f1 + d * (fs / N)
a2 = 1
x1 = np.sin(2 * np.pi * f1 * tt)
x2 = a2 * np.sin(2 * np.pi * f2 * tt)
x = x1 + x2
xw = x * sig.boxcar(N)
X = fft(xw)