git status -u, learn something new every day.

libs/libcodec2/unittest/tprede.c

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+/* 
+   tpre_de.c
+   David Rowe
+   Sep 24 2012
+
+   Unit test to generate the combined impulse response of pre & de-emphasis filters.
+
+     pl("../unittest/out48.raw",1,3000)
+     pl("../unittest/out8.raw",1,3000)
+
+   Listening to it also shows up anything nasty:
+
+     $ play -s -2 -r 48000 out48.raw
+     $ play -s -2 -r 8000 out8.raw
+
+  */
+
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "lpc.h"
+
+#define N                        10 
+#define F                        10
+
+int main() {
+    FILE  *fprede;
+    float  Sn[N], Sn_pre[N], Sn_de[N];
+    float  pre_mem = 0.0, de_mem = 0.0;
+    int    i, f;
+
+    fprede = fopen("prede.txt", "wt");
+    assert(fprede != NULL);
+    
+    for(i=0; i<N; i++)
+	Sn[i] = 0.0;
+
+    Sn[0]= 1.0;
+
+    for(f=0; f<F; f++) {
+	pre_emp(Sn_pre, Sn, &pre_mem, N);
+	de_emp(Sn_de, Sn_pre, &de_mem, N);
+	for(i=0; i<N; i++) {
+	    fprintf(fprede, "%f\n", Sn_de[i]);		
+	}
+	Sn[0] = 0.0;
+    }
+
+    fclose(fprede);
+
+    return 0;
+}