def hamming(win_len, mode='symmetric'):
if mode == 'symmetric':
window = get_window('hamm', win_len, fftbins=False)
elif mode == 'periodic':
window = get_window('hamm', win_len, fftbins=True)
else:
print('Window mode can not be {}'.format(mode))
raise
return window
def hanning(win_len, mode='symmetric'):
if mode == 'symmetric':
window = get_window('hann', win_len + 2, fftbins=False)
window = window[1:-1] # 去掉前后的两个0
elif mode == 'periodic':
window = get_window('hann', win_len, fftbins=True)
else:
print('Window mode can not be {}'.format(mode))
raise
return window
def get_chromagram(y, sr, chroma):
"""
returns chromagram
Parameters
----------
y : number > 0 [scalar]
audio
sr: number > 0 [scalar]
target sampling rate
chroma: str
chroma-samplerate-framesize-overlap
Returns
-------
list of chromagrams
"""
params = get_parameters_chroma(chroma)
chroma = params["chroma"]
doce_bins_tuned_chroma = None
if chroma == 'nnls':
doce_bins_tuned_chroma = get_nnls(y, params["sr"], params["fr"], params["off"])
elif chroma == 'cqt':
win = get_window('blackmanharris', params["fr"])
doce_bins_tuned_chroma = chroma_cqt(y=y, sr=params["sr"],
C=None,
hop_length=params["off"],
norm=None,
# threshold=0.0,
window=win,
fmin=110,
n_chroma=12,
n_octaves=4 if params["chroma"] == "cqt" and params["sr"] == 5525 else 5,
bins_per_octave=36)
elif chroma == 'cens':
win = get_window('blackmanharris', params["fr"])
doce_bins_tuned_chroma = chroma_cens(y=y, sr=params["sr"],
C=None,
hop_length=params["off"],
norm=None,
window=win,
fmin=110,
n_chroma=12,
n_octaves=5,
bins_per_octave=36)
elif chroma == 'stft':
win = get_window('blackmanharris', params["fr"])
doce_bins_tuned_chroma = chroma_stft(y=y, sr=params["sr"], hop_length=params["off"], norm=None, window=win,
n_chroma=12)
return doce_bins_tuned_chroma
def stft_from_frames(frames, window='hann', dtype=np.complex64):
"""
Variation of the librosa.core.stft function,
that computes the short-time-fourier-transfrom from frames instead from the signal.
See http://librosa.github.io/librosa/_modules/librosa/core/spectrum.html#stft
"""
win_length = frames.shape[0]
n_fft = win_length
fft_window = filters.get_window(window, win_length, fftbins=True)
# Reshape so that the window can be broadcast
fft_window = fft_window.reshape((-1, 1))
# Pre-allocate the STFT matrix
stft_matrix = np.empty((int(1 + n_fft // 2), frames.shape[1]),
dtype=dtype,
order='F')
# how many columns can we fit within MAX_MEM_BLOCK?
n_columns = int(util.MAX_MEM_BLOCK /
(stft_matrix.shape[0] * stft_matrix.itemsize))
for bl_s in range(0, stft_matrix.shape[1], n_columns):
bl_t = min(bl_s + n_columns, stft_matrix.shape[1])
# RFFT and Conjugate here to match phase from DPWE code
stft_matrix[:,
bl_s:bl_t] = fft.fft(fft_window * frames[:, bl_s:bl_t],
axis=0)[:stft_matrix.shape[0]].conj()
return stft_matrix
def __init__(
self,
n_fft: int = 512,
n_mels: int = 80,
sample_rate: int = 16000,
hop_length: int = 200,
f_max=8000, # default
f_min=0, # default
power=2.0, # default
win_length=None,
window='hann', # default
center=True,
pad_mode='reflect', # default
norm=None, # default for pytorch
htk=True # default for pytorch
):
self.n_fft = n_fft
self.sample_rate = sample_rate
self.pad_mode = pad_mode
self.hop_length = hop_length
self.power = power
self.win_length = n_fft
self.mel_basis = filters.mel(
sr=sample_rate,
n_fft=n_fft,
n_mels=n_mels, # mel filter
fmin=f_min, # mel filter
fmax=f_max, # mel filter
norm=norm, # mel filter
htk=htk)
self.fft_window = get_window(window, self.win_length,
fftbins=True).reshape((-1, 1))
def __init__(self, length, stride=None, amplitude=1.):
self.l = length
self.stride = int(stride)
if stride == None:
self.stride = length // 2
self.amplitude = amplitude
self.last_frame = None
self.w = get_window('hann', self.l, True)
def get_mfcc(self, sig_frm):
sig_frm = sig_frm / 32768.0
window = 'hamming'
win_length = sig_frm.shape[0]
hop_length = win_length
center = True
n_fft = win_length
fft_window = get_window(window, win_length, fftbins=True)
fft_window = util.pad_center(fft_window, n_fft)
fft_window = fft_window.reshape((-1, 1))
util.valid_audio(sig_frm)
sig_frm = sig_frm[:, None]
stft_matrix = np.empty((int(1 + n_fft // 2), 1),
dtype=np.complex64,
order='F')
stft = fft.fft(fft_window * sig_frm,
axis=0)[:stft_matrix.shape[0]].conj()
powspec = np.abs(stft)**2
melspec = librosa.feature.melspectrogram(S=powspec,
hop_length=hop_length,
n_fft=n_fft,
n_mels=40)
mfcc = librosa.feature.mfcc(S=librosa.logamplitude(melspec), n_mfcc=13)
n_fft = 512
fft_window = get_window(window, win_length, fftbins=True)
fft_window = util.pad_center(fft_window, n_fft)
fft_window = fft_window.reshape((-1, 1))
y = np.pad(sig_frm[:, 0], int(n_fft // 2), mode='reflect')
pad_frame = librosa.util.frame(y,
frame_length=n_fft,
hop_length=win_length * 2)[:, 0][:,
None]
stft_matrix = np.empty((int(1 + n_fft // 2), 1),
dtype=np.complex64,
order='F')
stft = fft.fft(fft_window * pad_frame,
axis=0)[:stft_matrix.shape[0]].conj()
powspec = np.abs(stft)**2
power_to_db = getattr(librosa, 'power_to_db')
spec = power_to_db(powspec)
self.spec_tape_add(spec)
return mfcc
def smooth(self, feat, win_len_smooth=4):
'''
This code is similar to the one used on librosa for smoothing cens:
https://librosa.github.io/librosa/generated/librosa.feature.chroma_cens.html
'''
win = filters.get_window('hann', win_len_smooth + 2, fftbins=False)
win /= np.sum(win)
win = np.atleast_2d(win)
feat = scipy.signal.convolve2d(feat, win, mode='same', boundary='fill')
return util.normalize(feat, norm=2, axis=0)
def __init__(self, input_shape, epochs=20, batch_size=32):
self.epochs = epochs
self.batch_size = batch_size
self.input_shape = input_shape
#self.mod el = self.Model_build(input_shape=input_shape)
self.Nx = 512
self.w = get_window(window='hann', Nx=self.Nx)
#self.spectrum = Spectrum() # FFT() would return the complex FFT, here we just want the magnitude spectrum
#self.mfcc = MFCC()
self.numPreprocessFrames = 10
self.frameSize = input_shape[1] / self.numPreprocessFrames
self.inputData = []
self.model = 0
def _init_wrapper(self, config):
self._config = config
self.sample_rate = config.sample_rate
self._preemphasis = config.preemphasis
self.n_fft = config.n_fft
self.num_freq = self.n_fft / 2 + 1
self.hop_length = int(config.frame_shift_ms / 1000 * self.sample_rate)
self.win_length = int(config.frame_length_ms / 1000 * self.sample_rate)
self.num_mels = config.num_mels
self._mel_basis = librosa.filters.mel(self.sample_rate,
self.n_fft,
n_mels=self.num_mels)
self.fft_window = filters.get_window('hann',
self.win_length,
fftbins=True).reshape(
(1, -1)).astype(np.float32)
def frames_stft(y_frames,
n_fft=2048,
win_length=None,
window='hann',
dtype=np.complex64):
"""
Adapted from librosa for frame input. NOTE: not centered anymore.
"""
# By default, use the entire frame
if win_length is None:
win_length = n_fft
fft_window = get_window(window, win_length, fftbins=True)
# Pad the window out to n_fft size
fft_window = util.pad_center(fft_window, n_fft)
# Reshape so that the window can be broadcast
fft_window = fft_window.reshape((-1, 1))
# Pre-allocate the STFT matrix
stft_matrix = np.empty((int(1 + n_fft // 2), y_frames.shape[1]),
dtype=dtype,
order='F')
# how many columns can we fit within MAX_MEM_BLOCK?
n_columns = int(util.MAX_MEM_BLOCK /
float(stft_matrix.shape[0] * stft_matrix.itemsize))
for bl_s in range(0, stft_matrix.shape[1], n_columns):
bl_t = min(bl_s + n_columns, stft_matrix.shape[1])
stft_matrix[:,
bl_s:bl_t] = fft.fft(fft_window * y_frames[:, bl_s:bl_t],
axis=0)[:stft_matrix.shape[0]]
return stft_matrix
import librosa
import numpy as np
import librosa.util as util
from librosa.filters import get_window
audio_path = "../AudioData/audio/D4_750.wav"
noise_path = "../AudioData/noise/Pink Noise.wav"
# 读取音频文件
y, sr = librosa.load(audio_path)
# 对音频文件进行分帧
win_len = n_fft = 200
hop_length = 80
# Pad the time series so that frames are centered
y = np.pad(y, int(n_fft // 2), mode='reflect')
# Window the time series.
y_frames = util.frame(y, frame_length=n_fft, hop_length=hop_length, axis=0)
# 获得窗系数
fft_window = get_window('hamm', 10, fftbins=False)
# fft_window = fft_window[1:-1]
print(fft_window)
fft_window = get_window('hamm', 10, fftbins=True)
print(fft_window)
# Pad the window out to n_fft size
fft_window = util.pad_center(fft_window, n_fft)
# Reshape so that the window can be broadcast
fft_window = fft_window.reshape((-1, 1))
#
frame_size = config['frame_size']
frame_step = config['frame_step']
n_fft = config['n_fft']
n_mels = config['mfcc_bank_cnt']
fmin = config['fmin']
fmax = config['fmax']
dtype = config.get('dtype', "int")
high_prec = config.get('use_high_prec', False) or dtype == "fix32_scal"
use_power = False
rad4 = round(math.log(n_fft // 2, 4)) == math.log(n_fft // 2, 4)
ndct = config.get('n_dct', False)
from librosa.filters import get_window
from librosa import util
librosa_fft_window = get_window("hann", frame_size, fftbins=True)
# Pad the window out to n_fft size
librosa_fft_window = util.pad_center(librosa_fft_window, n_fft)
stft = librosa.core.spectrum.stft(data,
n_fft,
frame_step,
frame_size,
center=False,
pad_mode="constant")
spect = np.abs(stft)**(1 if not use_power else 2)
mel_basis = librosa.filters.mel(samplerate, n_fft, n_mels, fmin, fmax)
mel_spect = np.dot(mel_basis, spect)
logmel = power_to_db(mel_spect, top_db=None)
mfcc = scipy.fftpack.dct(logmel, axis=0, type=2, norm=None)
with open("ground_truth.h", "w") as f: