def synt_from_mcep_matrix_to_spec(f0, mcep_mat, aperiod_mat):
world = World(samplingrate, float(hop_length) / samplingrate * 1000)
fft_size = world.fftsize()
spec_from_mcep = mcep2spec_from_matrix(mcep_mat, alpha, fft_size)
out = world.synthesis(f0, spec_from_mcep, aperiod_mat)
return out
