From b02468867a0910fa43ec254420bdef915d234428 Mon Sep 17 00:00:00 2001
From: Kizarm <mrazik@volny.cz>
Date: Sun, 10 Dec 2023 10:52:48 +0100
Subject: [PATCH] spectrum blur suppression

---
 main.cpp | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/main.cpp b/main.cpp
index eec343d..cf04827 100644
--- a/main.cpp
+++ b/main.cpp
@@ -16,19 +16,24 @@ static constexpr int OFS   = 20;
 
 static CFFT fft (ORDER);
 static vector<double> mono;
+static bool sign = false;
 
 void cputs (const char * s) {
-  const complex one (0.0, 256.0), zero (0.0, 0.0);
+  const complex plus (0.0, 256.0), minus (0.0, -256.0);
   complex data [TAPS];
   memset (&data,0, TAPS * sizeof(complex));
   int n = 0;
   while (true) {
     const char c = s [n];
     if (c == '\0') break;
-    const complex fill = c == '#' ? one : zero;
-    const int k = n + OFS;
-    data[k]        = fill;
-    data[TAPS - k] = fill;
+    if (c == '#' ) {
+      // Střídání fáze 0/180 dost potlačí rozmazání spektra.
+      const complex fill = sign ? plus : minus;
+      const int k = n + OFS;
+      data[k]        = fill;
+      data[TAPS - k] = fill;
+      sign = ! sign;
+    }
     putchar(c);
     n += 1;
   }
@@ -82,7 +87,7 @@ int main (int argc, char *argv[]) {
   for (const char * p = buffer; *p; p++) {
     banchr (*p);
   }
-  WriteSound ();
+  WriteSound ("test.vaw");
   return 0;
 }