def fft_filter(v_frm_short_a, shift_a, v_spec_diff_db_a, fft_len):
# dB to absolute:
v_spec_diff_a = la.db(v_spec_diff_db_a, b_inv=True)
right_a = v_frm_short_a.size - shift_a
v_frm_short_a_ext = np.r_[np.zeros(fft_len/2 - shift_a) , v_frm_short_a , np.zeros(fft_len/2 - right_a)]
v_fft_frm_short_a_ext = np.fft.fft(v_frm_short_a_ext) * la.add_hermitian_half(v_spec_diff_a[None,:], data_type='mag')[0]
# To time domain:
v_frm_short_a_ext_filt = np.fft.ifft(v_fft_frm_short_a_ext).real
return v_frm_short_a_ext_filt
def synthesis_from_lossless(m_mag, m_real, m_imag, v_shift):
m_ph_cmpx = m_real + m_imag * 1j
### with protection against divide-by-zero:
m_ph_cmpx_mag = np.absolute(m_ph_cmpx)
m_ph_cmpx_mag[m_ph_cmpx_mag==0.0] = 1.0
m_fft = m_mag * m_ph_cmpx / m_ph_cmpx_mag
m_fft = la.add_hermitian_half(m_fft, data_type='complex')
m_frm = np.fft.ifft(m_fft).real
m_frm = np.fft.fftshift(m_frm, axes=1)
v_pm = la.shift_to_pm(v_shift)
v_syn_sig = mp.ola(m_frm,v_pm)
return v_syn_sig
def get_formant_locations_from_raw_long_frame(v_sig, v_pm, nx, fft_len):
'''
nx: frame index
'''
#v_sig, fs = la.read_audio_file(wavfile)
# Epoch detection:
#v_pm_sec, v_voi = la.reaper_epoch_detection(wavfile)
#v_pm = lu.round_to_int(v_pm_sec * fs)
# Raw-long Frame extraction:
v_frm_long = v_sig[v_pm[nx-2]:v_pm[nx+2]+1]
# Win:
left_len = v_pm[nx] - v_pm[nx-2]
right_len = v_pm[nx+2] - v_pm[nx]
v_win = la.gen_non_symmetric_win(left_len, right_len, np.hanning, b_norm=False)
v_frm_long_win = v_frm_long * v_win
# Spectrum:
v_mag = la.remove_hermitian_half(np.absolute(np.fft.fft(v_frm_long_win, n=fft_len)[None,:]))[0]
v_mag_db = la.db(v_mag)
# Mel warping:
alpha = 0.50 # 0.55 - 0.60
#ncoeffs = 2048 # must be even
v_mag_mel = la.sp_mel_warp(v_mag[None,:], fft_len/2, alpha=alpha, in_type=3)[0]
v_sp_cmplx = la.build_min_phase_from_mag_spec(v_mag_mel[None,:])[0]
v_sp_cmplx_ext = la.add_hermitian_half(v_sp_cmplx[None,:], data_type='complex')[0]
v_frm_long_win_mel = np.fft.ifft(v_sp_cmplx_ext).real
if False:
plt.close('all')
pl(la.db(v_mag))
pl(la.db(np.absolute(v_sp_cmplx)))
pl(v_frm_long_win_mel)
# Formant extraction -LPC method:--------------------------------------------------
n_lpc_coeffs = 30 # 40
v_lpc_mel, v_e, v_refl = lpc(v_frm_long_win_mel, n_lpc_coeffs)
v_lpc_mag_mel = lpc_to_mag(v_lpc_mel, fft_len=fft_len)
v_lpc_mag_mel_db = la.db(v_lpc_mag_mel)
v_lpc_mag_mel_db = v_lpc_mag_mel_db - np.mean(v_lpc_mag_mel_db) + np.mean(la.db(v_mag_mel))
v_frmnts_bins_mel, v_frmnts_gains_db = get_formant_locations_from_spec_env(v_lpc_mag_mel_db)
# Getting bandwidth:
fft_len_half = 1 + fft_len / 2
v_vall_bins = get_formant_locations_from_spec_env(-v_lpc_mag_mel_db)[0]
v_vall_bins = np.r_[0, v_vall_bins, fft_len_half-1]
nfrmnts = v_frmnts_bins_mel.size
v_frmnts_bw_mel = np.zeros(nfrmnts) - 1.0
for nx_f in xrange(nfrmnts):
#Left slope:
curr_frmnt_bin = v_frmnts_bins_mel[nx_f]
curr_vall_l_bin = v_vall_bins[nx_f]
curr_vall_r_bin = v_vall_bins[nx_f+1]
curr_midp_l = int((curr_frmnt_bin + curr_vall_l_bin) / 2.0)
curr_midp_r = int((curr_frmnt_bin + curr_vall_r_bin) / 2.0)
# Protection:
if curr_midp_l==curr_frmnt_bin:
curr_midp_l = curr_vall_l_bin
if curr_midp_r==curr_frmnt_bin:
curr_midp_r = curr_vall_r_bin
#print(nx_f)
# 27 y 32
slope_l = (v_frmnts_gains_db[nx_f] - v_lpc_mag_mel_db[curr_midp_l]) / (curr_frmnt_bin - curr_midp_l).astype(float)
slope_r = (v_frmnts_gains_db[nx_f] - v_lpc_mag_mel_db[curr_midp_r]) / (curr_frmnt_bin - curr_midp_r).astype(float)
slope_ave = (slope_l - slope_r) / 2.0
v_frmnts_bw_mel[nx_f] = 1.0 / slope_ave
# Filtering by bandwidth:
# bw_thress = 7.0
# v_frmnts_bins_mel = v_frmnts_bins_mel[v_frmnts_bw_mel<bw_thress]
# v_frmnts_gains_db = v_frmnts_gains_db[v_frmnts_bw_mel<bw_thress]
# v_frmnts_bw_mel = v_frmnts_bw_mel[v_frmnts_bw_mel<bw_thress]
# Computing frame short:--------------------------------
# Win:
left_len_short = v_pm[nx] - v_pm[nx-1]
right_len_short = v_pm[nx+1] - v_pm[nx]
v_win_short = la.gen_non_symmetric_win(left_len_short, right_len_short, np.hanning, b_norm=False)
v_frm_short = v_sig[v_pm[nx-1]:v_pm[nx+1]+1]
v_frm_short_win = v_frm_short * v_win_short
shift = v_pm[nx] - v_pm[nx-1]
# Formant extraction - True envelope method:----------------------------------------
# Not finished.
#v_true_env_db = la.true_envelope(v_mag_db[None,:], in_type='db', ncoeffs=400, thres_db=0.1)[0]
if True:
plt.figure(); plt.plot(la.db(v_mag_mel)); plt.plot(v_lpc_mag_mel_db); plt.grid(); plt.show()
#pl(v_mag_db)
if True: import ipdb; ipdb.set_trace(context=8) # breakpoint 906d26d6 //
return v_mag_db, v_lpc_mag_mel_db, v_frmnts_bins_mel, v_frmnts_gains_db, v_frmnts_bw_mel, v_frm_short_win, shift