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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
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commit 033c4e9a5b
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31
firmware/baseband/dsp_goertzel.cpp
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@ -28,29 +28,26 @@
namespace dsp {
GoertzelDetector::GoertzelDetector(
const float frequency,
const uint32_t sample_rate
) {
coefficient = 2.0 * sin_f32((2.0 * pi * frequency / sample_rate) - pi / 2.0);
const float frequency,
const uint32_t sample_rate) {
coefficient = 2.0 * sin_f32((2.0 * pi * frequency / sample_rate) - pi / 2.0);
}
float GoertzelDetector::execute(
const buffer_s16_t& src
) {
const buffer_s16_t& src) {
const size_t count = src.count;
const size_t count = src.count;
for (size_t i = 0; i < count; i++) {
s[2] = s[1];
s[1] = s[0];
s[0] = src.p[i] + coefficient * s[1] - s[2];
}
for (size_t i = 0; i < count; i++) {
s[2] = s[1];
s[1] = s[0];
s[0] = src.p[i] + coefficient * s[1] - s[2];
}
const uint32_t sq0 = s[0] * s[0];
const uint32_t sq1 = s[1] * s[1];
float magnitude = __builtin_sqrtf(sq0 + sq1 - s[0] * s[1] * coefficient);
const uint32_t sq0 = s[0] * s[0];
const uint32_t sq1 = s[1] * s[1];
float magnitude = __builtin_sqrtf(sq0 + sq1 - s[0] * s[1] * coefficient);
return magnitude;
return magnitude;
}
} /* namespace dsp */