def combine_with_mfcc(xdir, neighbor=2, nfft=256, normal_flag=0):
_, x = wavfile.read(xdir)
_, _, Zxx = stft(x, freq, nfft=nfft)
Zxx = log((abss(Zxx)).T + 1e-7) if normal_flag == 0 else normalize_mean(log((abss(Zxx)).T + 1e-7))
m, n = Zxx.shape
tmp = zer(m * n * (neighbor * 2 + 1), dtype='float32').reshape(m, -1)
for i in range(2 * neighbor + 1):
if i <= neighbor:
shift = neighbor - i
tmp[shift:m, i * n: (i + 1) * n] = Zxx[:m - shift]
for j in range(shift):
tmp[j, i * n: (i + 1) * n] = Zxx[0, :]
else:
shift = i - neighbor
tmp[:m - shift, i * n: (i + 1) * n] = Zxx[shift:m]
for j in range(shift):
tmp[m - (j + 1), i * n: (i + 1) * n] = Zxx[m - 1, :]
# now tmp is "make_window_buffer" output
# then calc mfcc & d & dd
mfcc_data = combine_mfcc_d_dd(mfcc(x, freq, winlen=0.016, winstep=0.008, nfft=256, winfunc=np.bartlett))
while True:
try:
tmp1 = np.concatenate((tmp, mfcc_data), axis=1)
break
except ValueError:
mfcc_data = np.concatenate((mfcc_data, np.zeros([1, mfcc_data.shape[1]])), axis=0)
continue
return tmp1
def get_Zyy(ydir, nfft=256, normal_flag=0):
"""
get the stft.T of the wav file in ydir
usually used in train and test, not in practical application
:param ydir:
:param nfft:
:param normal_flag: 0 for log power, 1 for normalized log power
:return:
"""
_, y = wavfile.read(ydir)
_, _, Zyy = stft(y, freq, nfft=nfft)
return log((abss(Zyy)).T+1e-7) if normal_flag == 0 else normalize_mean(log((abss(Zyy)).T+1e-7))
def combine_with_mfcc_Zyy(ydir, nfft=256, normal_flag=0):
_, y = wavfile.read(ydir)
_, _, Zyy = stft(y, freq, nfft=nfft)
y_data = log((abss(Zyy)).T + 1e-7) if normal_flag == 0 else normalize_mean(log((abss(Zyy)).T + 1e-7))
mfcc_data = combine_mfcc_d_dd(mfcc(y, freq, winlen=0.016, winstep=0.008, nfft=256, winfunc=np.bartlett))
while True:
try:
tmp1 = np.concatenate((y_data, mfcc_data), axis=1)
break
except ValueError:
mfcc_data = np.concatenate((mfcc_data, np.zeros([1, mfcc_data.shape[1]])), axis=0)
continue
return tmp1
def make_window_buffer(xdir, neighbor=2, nfft=256, normal_flag=0):
"""
get frame group for DNN input, and this is the key
expend every row of the array to the combination of itself and its neighbors
Example:
given array like this:
[[1, 1, 1],
[2, 2, 2],
[3, 3, 3],
[4, 4, 4],
[5, 5, 5],
[6, 6, 6],
[7, 7, 7]]
and we combine 1 neighbor, then we have:
[[1, 1, 1, 1, 1, 1, 2, 2, 2],
[1, 1, 1, 2, 2, 2, 3, 3, 3],
[2, 2, 2, 3, 3, 3, 4, 4, 4],
[3, 3, 3, 4, 4, 4, 5, 5, 5],
[4, 4, 4, 5, 5, 5, 6, 6, 6],
[5, 5, 5, 6, 6, 6, 7, 7, 7],
[6, 6, 6, 7, 7, 7, 7, 7, 7]]
(neighbor)↑,↑,↑ (neighbor)
noticing this column marked above, they are the origin array
noticing that for the start and end, it will repeat 'neighbour' times to make up
:param xdir:
:param neighbor:
:param nfft:
:param normal_flag: 0 for log power, 1 for normalized log power
:return:
"""
_, x = wavfile.read(xdir)
_, _, Zxx = stft(x, freq, nfft=nfft)
Zxx = log((abss(Zxx)).T+1e-7) if normal_flag == 0 else normalize_mean(log((abss(Zxx)).T+1e-7))
m, n = Zxx.shape
tmp = zer(m * n * (neighbor * 2 + 1), dtype='float32').reshape(m, -1)
for i in range(2 * neighbor + 1):
if i <= neighbor:
shift = neighbor - i
tmp[shift:m, i * n: (i + 1) * n] = Zxx[:m - shift]
for j in range(shift):
tmp[j, i * n: (i + 1) * n] = Zxx[0, :]
else:
shift = i - neighbor
tmp[:m-shift, i * n: (i+1) * n] = Zxx[shift:m]
for j in range(shift):
tmp[m-(j + 1), i * n: (i + 1) * n] = Zxx[m-1, :]
return tmp
def test_GRU(model, input_path, output_path):
_, s = wavfile.read(input_path)
_, _, Zxx = stft(s, freq)
Zxx1 = log((abss(Zxx)).T + 1e-7)
print(Zxx1.shape)
yt = pack_GRU(input_path)
y = model.predict(np.reshape(yt, [1, -1, 22]))
y = unpack_GRU(y)
print(y.shape)
ypreComplex = exp(y.T * Zxx1.T) * exp(complex(0, 1) * ang(Zxx))
_, xrec = istft(ypreComplex, freq)
dataWrite = xrec.astype(np.int16)
wavfile.write(output_path, freq, dataWrite)
def test_model_mfcc(model, input_path, output_path, neighbor, nffts, normal_flag=0):
_, s = wavfile.read(input_path)
_, _, Zxx = stft(s, freq)
Zxx1 = log((abss(Zxx)).T+1e-7)
y_input = combine_with_mfcc(input_path, neighbor=neighbor, nfft=nffts, normal_flag=normal_flag)
y = model.predict(y_input)
y = (np.delete(y, np.s_[-39:], axis=1)).T # delete mfcc data
ypreComplex = exp(y) * exp(complex(0, 1) * ang(Zxx)) if normal_flag == 0 \
else exp(unnormalize(y, Zxx1)) * exp(complex(0, 1) * ang(Zxx))
# ypreComplex = unnormalize(exp(y) * exp(complex(0, 1) * ang(Zxx)), abss(Zxx)) # wrong code
_, xrec = istft(ypreComplex, freq)
dataWrite = xrec.astype(np.int16)
wavfile.write(output_path, freq, dataWrite)
def test_model(model, input_path, output_path, neighbor, nffts, normal_flag=0):
_, s = wavfile.read(input_path)
_, _, Zxx = stft(s, freq)
Zxx1 = log((abss(Zxx)).T+1e-7)
y_input = make_window_buffer(input_path, neighbor=neighbor, nfft=nffts, normal_flag=normal_flag)
y = model.predict(y_input).T
# print(y.shape, unnormalize(y, abss(Zxx)).shape, unnormalize(y, abss(Zxx)).dtype)
ypreComplex = exp(y) * exp(complex(0, 1) * ang(Zxx)) if normal_flag == 0 \
else exp(unnormalize(y, Zxx1)) * exp(complex(0, 1) * ang(Zxx))
# ypreComplex = unnormalize(exp(y) * exp(complex(0, 1) * ang(Zxx)), abss(Zxx)) # wrong code
_, xrec = istft(ypreComplex, freq)
dataWrite = xrec.astype(np.int16)
wavfile.write(output_path, freq, dataWrite)
def pack_GRU(xdir):
_, x = wavfile.read(xdir)
_, _, Zxx = stft(x, freq)
Zxx = log((abss(Zxx)) + 1e-7)
return bark_dct(bark_rescale(fr2bark(Zxx)))
