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change decimation factor depending on sample rate

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This commit is contained in:
Ahmet Inan 2016-05-27 12:50:15 +02:00
parent ad31d8e194
commit 6f96811f38
1 changed files with 18 additions and 17 deletions
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35
app/src/main/rs/stft.rsh
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@ -102,7 +102,7 @@ static void draw_line(int x0, int y0, int x1, int y1)
static void spectrum_analyzer(int amplitude)
{
const int M = 7;
int M = (sample_rate + 3000) / 6000;
static int n, m;
static int buffer[stft_N];
static float input[radix2_N];
@ -110,25 +110,26 @@ static void spectrum_analyzer(int amplitude)
if (disable_analyzer)
return;
if (M > 1) {
#if 1
const int order = 5;
const int gain = pown(M, order);
static cic_t cascade[order];
int tmp = cic_int_cascade(cascade, amplitude, order);
if (++m < M)
return;
m = 0;
amplitude = cic_comb_cascade(cascade, tmp, order) / gain;
const int order = 5;
const int gain = pown(M, order);
static cic_t cascade[order];
int tmp = cic_int_cascade(cascade, amplitude, order);
if (++m < M)
return;
m = 0;
amplitude = cic_comb_cascade(cascade, tmp, order) / gain;
#else
static int sum;
sum += amplitude;
if (++m < M)
return;
m = 0;
amplitude = sum / M;
sum = 0;
static int sum;
sum += amplitude;
if (++m < M)
return;
m = 0;
amplitude = sum / M;
sum = 0;
#endif
}
buffer[n] = amplitude;
if (!(++n&(radix2_N-1))) {