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arduinoFFT
kopia lustrzana https://github.com/kosme/arduinoFFT
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Misc changes to improve performance

pull/106/head
Enrique Condes 2024-11-21 15:26:23 +08:00
rodzic fe351e57bf
commit 7f340769fa
1 zmienionych plików z 16 dodań i 15 usunięć
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src/arduinoFFT.cpp
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@ -52,7 +52,7 @@ template <typename T>
void ArduinoFFT<T>::complexToMagnitude(T *vReal, T *vImag,
uint_fast16_t samples) const {
// vM is half the size of vReal and vImag
for (uint_fast16_t i = 0; i < samples; i++) {
for (uint_fast16_t i = 0; i < (samples >> 1) + 1; i++) {
vReal[i] = sqrt_internal(sq(vReal[i]) + sq(vImag[i]));
}
}
@ -189,11 +189,12 @@ void ArduinoFFT<T>::majorPeak(T *vData, uint_fast16_t samples,
T delta = 0.5 * ((vData[IndexOfMaxY - 1] - vData[IndexOfMaxY + 1]) /
(vData[IndexOfMaxY - 1] - (2.0 * vData[IndexOfMaxY]) +
vData[IndexOfMaxY + 1]));
T interpolatedX = ((IndexOfMaxY + delta) * samplingFrequency) / (samples - 1);
if (IndexOfMaxY == (samples >> 1)) // To improve calculation on edge values
interpolatedX = ((IndexOfMaxY + delta) * samplingFrequency) / (samples);
if (IndexOfMaxY == (samples >> 1)) { // To improve calculation on edge values
*frequency = ((IndexOfMaxY + delta) * samplingFrequency) / (samples);
} else {
*frequency = ((IndexOfMaxY + delta) * samplingFrequency) / (samples - 1);
}
// returned value: interpolated frequency peak apex
*frequency = interpolatedX;
if (magnitude != nullptr) {
#if defined(ESP8266) || defined(ESP32)
*magnitude = fabs(vData[IndexOfMaxY - 1] - (2.0 * vData[IndexOfMaxY]) +
@ -504,16 +505,16 @@ template <typename T> double ArduinoFFT<T>::sqrt_internal(double x) const {
template <typename T>
const T ArduinoFFT<T>::_WindowCompensationFactors[11] = {
1.0000000000 * 2.0, // rectangle (Box car)
1.8549343278 * 2.0, // hamming
1.8554726898 * 2.0, // hann
2.0039186079 * 2.0, // triangle (Bartlett)
2.8163172034 * 2.0, // nuttall
2.3673474360 * 2.0, // blackman
2.7557840395 * 2.0, // blackman nuttall
2.7929062517 * 2.0, // blackman harris
3.5659039231 * 2.0, // flat top
1.5029392863 * 2.0, // welch
2.0, // 1.0000000000 * 2.0, // rectangle (Box car)
3.7098686556, // 1.8549343278 * 2.0, // hamming
3.7109453796, // 1.8554726898 * 2.0, // hann
4.0078372158, // 2.0039186079 * 2.0, // triangle (Bartlett)
5.6326344068, // 2.8163172034 * 2.0, // nuttall
4.734694872, // 2.3673474360 * 2.0, // blackman
5.511568079, // 2.7557840395 * 2.0, // blackman nuttall
5.5858125034, // 2.7929062517 * 2.0, // blackman harris
7.1318078462, // 3.5659039231 * 2.0, // flat top
3.0058785726, // 1.5029392863 * 2.0, // welch
// This is added as a precaution, since this index should never be
// accessed under normal conditions
1.0 // Custom, precompiled value.