From 085a85d9ae84e6e5ae2d7d751899e26c2d08d3f3 Mon Sep 17 00:00:00 2001
From: shahules786 <shahules786@gmail.com>
Date: Thu, 27 Oct 2022 11:32:50 +0530
Subject: [PATCH] fourier transforms using cnn

---
 enhancer/utils/transforms.py | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/enhancer/utils/transforms.py b/enhancer/utils/transforms.py
index bf481e8..bbbae90 100644
--- a/enhancer/utils/transforms.py
+++ b/enhancer/utils/transforms.py
@@ -2,6 +2,7 @@ from typing import Optional
 
 import numpy as np
 import torch
+import torch.nn.functional as F
 from scipy.signal import get_window
 from torch import nn
 
@@ -42,7 +43,22 @@ class ConvSTFT(ConvFFT):
         self.register_buffer("weight", self.init_kernel)
 
     def forward(self, input):
-        pass
+
+        if input.dim() < 2:
+            raise ValueError(
+                f"Expected signal with shape 2 or 3 got {input.dim()}"
+            )
+        elif input.dim() == 2:
+            input = input.unsqueeze(1)
+        else:
+            pass
+        input = F.pad(
+            input,
+            (self.window_len - self.hop_size, self.window_len - self.hop_size),
+        )
+        output = F.conv1d(input, self.weight, stride=self.hop_size)
+
+        return output
 
 
 class ConviSTFT(ConvFFT):
@@ -58,6 +74,11 @@ class ConviSTFT(ConvFFT):
         )
         self.hop_size = hop_size if hop_size else window_len // 2
         self.register_buffer("weight", self.init_kernel)
+        self.register_buffer("enframe", np.eye(window_len).unsqueeze(1))
 
-    def forward(self, input):
-        pass
+    def forward(self, input, phase=None):
+
+        if phase is not None:
+            real = input * torch.cos(phase)
+            imag = input * torch.sin(phase)
+            input = torch.cat([real, imag], 1)