From fdf6e7e882ac8d8b1c3bf1f9ac55dff4cb02a63e Mon Sep 17 00:00:00 2001
From: Roman Zeyde <roman.zeyde@gmail.com>
Date: Mon, 16 Feb 2015 19:12:05 +0200
Subject: [PATCH] sampling: use raised cosine window.

---
 amodem/sampling.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/amodem/sampling.py b/amodem/sampling.py
index 576a7f5..aa21b9d 100644
--- a/amodem/sampling.py
+++ b/amodem/sampling.py
@@ -14,7 +14,7 @@ class Interpolator(object):
 
         N = resolution * width
         u = np.arange(-N, N, dtype=float)
-        window = (1 + np.cos(0.5 * np.pi * u / N)) / 2.0  # (Hann window)
+        window = np.cos(0.5 * np.pi * u / N) ** 2.0  # raised cosine
 
         h = np.sinc(u / resolution) * window
         self.filt = []