Merge pull request #115 from sp-nitech/mixed

Support mixed phase filter

Author: takenori-y

README.md

@@ -3,7 +3,7 @@
 *diffsptk* is a differentiable version of [SPTK](https://github.com/sp-nitech/SPTK) based on the PyTorch framework.
 
 [![Latest Manual](https://img.shields.io/badge/docs-latest-blue.svg)](https://sp-nitech.github.io/diffsptk/latest/)
-[![Stable Manual](https://img.shields.io/badge/docs-stable-blue.svg)](https://sp-nitech.github.io/diffsptk/2.3.0/)
+[![Stable Manual](https://img.shields.io/badge/docs-stable-blue.svg)](https://sp-nitech.github.io/diffsptk/2.4.0/)
 [![Downloads](https://static.pepy.tech/badge/diffsptk)](https://pepy.tech/project/diffsptk)
 [![Python Version](https://img.shields.io/pypi/pyversions/diffsptk.svg)](https://pypi.python.org/pypi/diffsptk)
 [![PyTorch Version](https://img.shields.io/badge/pytorch-2.0.0%20%7C%202.6.0-orange.svg)](https://pypi.python.org/pypi/diffsptk)

diffsptk/modules/c2mpir.py

@@ -77,7 +77,7 @@ def forward(self, c):
     @staticmethod
     def _forward(c, ir_length, n_fft):
         C = torch.fft.fft(c, n=n_fft)
-        h = torch.fft.ifft(cexp(C))[..., :ir_length].real
+        h = torch.fft.ifft(cexp(C)).real[..., :ir_length]
         return h
 
     _func = _forward

diffsptk/modules/imglsadf.py

@@ -35,8 +35,11 @@ def forward(self, y, mc):
         y : Tensor [shape=(..., T)]
             Audio signal.
 
-        mc : Tensor [shape=(..., T/P, M+1)]
-            Mel-generalized cepstrum, not MLSA digital filter coefficients.
+        mc : Tensor [shape=(..., T/P, M+1)] or [shape=(..., T/P, N+M+1)]
+            Mel-generalized cepstrum, not MLSA digital filter coefficients. Note that
+            the mixed-phase case assumes that the coefficients are of the form
+            c_{-N}, ..., c_{0}, ..., c_{M}, where M is the order of the minimum-phase
+            part and N is the order of the maximum-phase part.
 
         Returns
         -------