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Test filter uses a dB graph to show the response graphically

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This commit is contained in:
Andreas Eversberg
2017-01-27 17:17:39 +01:00
parent 7ea3bc188d
commit b3fd53b165
3 changed files with 25 additions and 22 deletions
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25
src/test/test_filter.c
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@@ -13,31 +13,12 @@
static double get_level(double *samples)
{
#if 0
int i;
double last = 0, envelope = 0;
int up = 0;
for (i = SAMPLERATE/2; i < SAMPLERATE; i++) {
if (last < samples[i]) {
up = 1;
} else if (last > samples[i]) {
if (up) {
if (last > envelope)
envelope = last;
}
up = 0;
}
last = samples[i];
}
#else
int i;
double envelope = 0;
for (i = SAMPLERATE/2; i < SAMPLERATE; i++) {
if (samples[i] > envelope)
envelope = samples[i];
}
#endif
return envelope;
}
@@ -72,7 +53,7 @@ int main(void)
gen_samples(samples, (double)i);
filter_process(&filter_low, samples, SAMPLERATE);
level = get_level(samples);
printf("%4d Hz: %.1f dB", i, level2db(level));
printf("%s%4d Hz: %.1f dB", debug_db(level), i, level2db(level));
if (i == 1000)
printf(" cutoff\n");
else if (i == 2000)
@@ -91,7 +72,7 @@ int main(void)
gen_samples(samples, (double)i);
filter_process(&filter_high, samples, SAMPLERATE);
level = get_level(samples);
printf("%4d Hz: %.1f dB", i, level2db(level));
printf("%s%4d Hz: %.1f dB", debug_db(level), i, level2db(level));
if (i == 2000)
printf(" cutoff\n");
else if (i == 1000)
@@ -112,7 +93,7 @@ int main(void)
filter_process(&filter_low, samples, SAMPLERATE);
filter_process(&filter_high, samples, SAMPLERATE);
level = get_level(samples);
printf("%4d Hz: %.1f dB", i, level2db(level));
printf("%s%4d Hz: %.1f dB", debug_db(level), i, level2db(level));
if (i == 1000)
printf(" cutoff high\n");
else if (i == 2000)