From 6bb6be845b6099550e0a530217633e30522093ad Mon Sep 17 00:00:00 2001
From: wukong <wukong@longaeva>
Date: Sun, 10 Jun 2018 00:00:01 -0700
Subject: correction to Hamming window expression

---
 hamming.awk | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'hamming.awk')

diff --git a/hamming.awk b/hamming.awk
index 30140a5..c853003 100644
--- a/hamming.awk
+++ b/hamming.awk
@@ -3,7 +3,7 @@
 # https://en.wikipedia.org/wiki/Window_function provides a few values for the
 # 'a0' and 'a1' parameters of the raised cosine.
 
-a1EGIN {
+BEGIN {
 
     N = ARGV[1]
 
@@ -20,10 +20,10 @@ a1EGIN {
 
     for (n=0; n<N; n++) {
         if (N > 1) {
-            w[n] = 0.5*a0 - 0.5*a1*cos((2*pi*n)/(N - 1))
+            w[n] = a0 - a1*cos((2*pi*n)/(N - 1))
             sum_w += w[n]
         }
-        printf("%f  %f\n", w[n], w[n]/sum_w)
+        printf("%g  %g\n", w[n], 2.0*(w[n])/(N + 1))
     }
 
 }
-- 
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