Git-Mirrors/portapack-mayhem
1
0
Fork 0
mirror of https://github.com/eried/portapack-mayhem.git synced 2025-06-25 07:10:43 -04:00
Code Issues Projects Releases Packages Wiki Activity

Extract complex16_mag_squared_to_dbv_norm to utility.

Browse source
This commit is contained in:
Jared Boone 2015-08-04 12:03:10 -07:00
parent d855336985
commit efaf13d2d1
3 changed files with 10 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

8
firmware/common/utility.cpp
View file

@ -24,6 +24,7 @@
#include "utility.hpp"
#include <cstdint>
#include <cmath>
#if 0
uint32_t gcd(const uint32_t u, const uint32_t v) {
@ -61,6 +62,13 @@ uint32_t gcd(const uint32_t u, const uint32_t v) {
}
#endif
float complex16_mag_squared_to_dbv_norm(const float c16_mag_squared) {
constexpr float mag2_max = -32768.0f * -32768.0f + -32768.0f * -32768.0f;
constexpr float mag2_log10_max = std::log10(mag2_max);
constexpr float mag2_to_db_factor = 20.0f / 2.0f;
return (std::log10(c16_mag_squared) - mag2_log10_max) * mag2_to_db_factor;
}
/* GCD implementation derived from recursive implementation at
* http://en.wikipedia.org/wiki/Binary_GCD_algorithm
*/