From d2e2bac65973c9528c95cab68415ed6c27037000 Mon Sep 17 00:00:00 2001
From: Ben Zhang <2690287331@qq.com>
Date: Sun, 5 Dec 2021 20:53:41 -0800
Subject: [PATCH] Fix the equation for generating sawtooth wave

fix the equation for generating sawtooth wave
---
 src/generate_sawtooth.m | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/generate_sawtooth.m b/src/generate_sawtooth.m
index 61fd0da..3886e99 100644
--- a/src/generate_sawtooth.m
+++ b/src/generate_sawtooth.m
@@ -20,19 +20,22 @@ function x = generate_sawtooth(amplitude, frequency, phase, fs, duration, duty)
     % initialize a one dimensional zero matrix to be populated
     x = zeros(1, n);
     
+    
     % populate the matrix
     for i = 1:n
         t = i * dt; % time of the i'th sample
         st = mod(frequency * t - phase, 1); % Progression through cycle
         
         slope = 2 * amplitude / period; % the incline slope from start to amplitude
+        mid = period / 2;
+        
         %part before the straght vertical line
-        if(st < period /2)
+        if(st < mid)
             x(i) = slope * st;
         
         %part after the straght vertical line
         else
-            x(i) = slope * st - amplitude;
+            x(i) = slope * (st - 0.5) - amplitude;
         
     end
-end
\ No newline at end of file
+end