ftc/soundthermo-cpp
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Improved handling of starting and ending silence

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ftc
2021-01-06 11:28:33 +03:00
parent 8b20a79198
commit 2440d0aa3f
2 changed files with 21 additions and 2 deletions
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Measurer.cpp
+20 -2
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@@ -83,11 +83,19 @@ float Measurer::ProcessData(QByteArray data)
}
cerr << "Samples read: " << oss.str() << "\n";
}
// determine silence threshold (will consider signal less than SILENCE of maximum as silence)
float max_sample = abs(samples[0]);
for (int i = 1; i < (int)samples.size(); i++)
{
float q = abs(samples[i]);
if (q > max_sample) max_sample = q;
}
float silence_level = SILENCE_LEVEL * max_sample;
// cut off starting and ending silence
int left_pos = 0;
while (left_pos < (int)samples.size() && abs(samples[left_pos]) < 1e-4) left_pos++;
while (left_pos < (int)samples.size() && abs(samples[left_pos]) < silence_level) left_pos++;
int right_pos = (int)samples.size() - 1;
while (right_pos >= 0 && abs(samples[right_pos]) < 1e-4) right_pos--;
while (right_pos >= 0 && abs(samples[right_pos]) < silence_level) right_pos--;
int len = right_pos - left_pos + 1;
int pow = 1, m = 0;
while (2 * pow <= len)
@@ -101,6 +109,16 @@ float Measurer::ProcessData(QByteArray data)
d[i] = Complex(samples[left_pos + i], 0);
}
FFT(d, pow, false);
if (debug)
{
ostringstream oss;
for (int i = 0; i < pow; i++)
{
float amp = (float)sqrt(d[i].real() * d[i].real() + d[i].imag() * d[i].imag());
oss << amp << " ";
}
cerr << "Spectrum: " << oss.str() << "\n";
}
float max = -1;
int argmax = 0;
for (int i = 0; i < pow; i++)