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Change baseband floats to normalize at +/-1.0.

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This commit is contained in:
Jared Boone
2016-02-14 12:38:50 -08:00
parent a5ed3b20b4
commit ef86848139
10 changed files with 35 additions and 26 deletions
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7
firmware/common/utility.cpp
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@@ -82,15 +82,14 @@ float fast_pow2(const float val) {
return u.f;
}
float complex16_mag_squared_to_dbv_norm(const float c16_mag_squared) {
constexpr float input_component_max = 32768;
constexpr float mag2_max = (input_component_max * input_component_max) * 2;
float mag2_to_dbv_norm(const float mag2) {
constexpr float mag2_max = 1.0f;
constexpr float mag2_log2_max = std::log2(mag2_max);
constexpr float log_mag2_mag_factor = 0.5f;
constexpr float log2_log10_factor = std::log10(2.0f);
constexpr float log10_dbv_factor = 20.0f;
constexpr float mag2_to_db_factor = log_mag2_mag_factor * log2_log10_factor * log10_dbv_factor;
return (fast_log2(c16_mag_squared) - mag2_log2_max) * mag2_to_db_factor;
return (fast_log2(mag2) - mag2_log2_max) * mag2_to_db_factor;
}
/* GCD implementation derived from recursive implementation at

2
firmware/common/utility.hpp
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@@ -72,7 +72,7 @@ constexpr size_t log_2(const size_t n, const size_t p = 0) {
float fast_log2(const float val);
float fast_pow2(const float val);
float complex16_mag_squared_to_dbv_norm(const float c16_mag_squared);
float mag2_to_dbv_norm(const float mag2);
inline float magnitude_squared(const std::complex<float> c) {
const auto r = c.real();