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normalize using maximum of all bins

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This commit is contained in:
Ahmet Inan 2015-01-07 21:02:34 +01:00
parent fd7326e24a
commit e1b68b4e59
1 changed files with 5 additions and 2 deletions
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7
app/src/main/rs/stft.rsh
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@ -51,16 +51,19 @@ static void spectrum_analyzer(float amplitude)
radix2(output, input, radix2_N, 1, 0);
for (int i = 0; i < radix2_N; ++i)
input[i] = 0.0f;
float maximum = 0.0f;
for (int i = 0; i < radix2_N; ++i)
maximum = max(maximum, cabs(output[i]));
for (int j = spectrum_height - 1; 0 < j; --j)
for (int i = 0; i < spectrum_width; ++i)
spectrum_buffer[spectrum_width * j + i] = spectrum_buffer[spectrum_width * (j-1) + i];
for (int i = 0; i < spectrum_width; ++i) {
int b = (i * (radix2_N / 2)) / spectrum_width;
#if 0
float dB = 20.0f * log10(cabs(output[b]));
float dB = 20.0f * log10(cabs(output[b]) / maximum);
float v = min(1.0f, max(0.0f, (60.0f + dB) / 60.0f));
#else
float v = min(1.0f, max(0.0f, pown(cabs(output[b]), 2)));
float v = min(1.0f, max(0.0f, pown(cabs(output[b]) / maximum, 2)));
#endif
spectrum_buffer[i] = rainbow(v);
}