added matlab

2025-08-21 07:27:52 +02:00
parent fd522e1b99
commit 64c6745c76
50 changed files with 2516 additions and 0 deletions
@@ -0,0 +1,53 @@
+function eval_adsr(Ta, Td, Vs, Tr, ks)
+
+% eval_adsr(0.1, 0.2, 0.2, 0.2)
+
+fs = 1000;
+
+a_a = -log(1-ks)/(Ta*fs);
+a_d = 5/(Td*fs);
+a_r = 5/(Tr*fs);
+state = 0;
+s = 0;
+tol = 1E-4;
+n = 1;
+p = 0;
+k = 1/ks;
+while (1),
+    
+    if state == 0       % Attack
+        s = a_a + (1-a_a)*s;
+        y(n) = k*s;
+        if s >= (ks-tol)
+            state = 1;
+            s = 1-ks;
+        end;
+    end;
+    if state == 1       % Decay
+        s = (1-a_d)*s;
+        y(n) = s/(1-ks);
+        if s <= (Vs+tol)
+            state = 2;
+            p = 0;
+        end;
+    end;
+    if state == 2       % sustain
+        y(n) = Vs;
+        if p >= 1*fs
+            state = 3;
+            s = Vs;
+        end;
+        p = p + 1;
+    end;
+    if state == 3       % Release
+        s = (1-a_r)*s;
+        y(n) = s;
+        if s <= (tol)
+            break;
+        end;
+    end;
+    n = n + 1;
+end;
+
+plot((0:n-1)/fs, y); grid;
+set(gca,'xtick',[0:0.1:(n-1)/fs])