sound.h

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#ifndef COMPONENT_SOUND_H
#define COMPONENT_SOUND_H
 
#include <cstdint>
 
#include "src/system/hal/pdm_handle.h"
 
#include "src/system/common/fft.h"
 
namespace lampda {
namespace component {
namespace microphone {
 
constexpr float silenceLevelDb = 30.0;
constexpr float highLevelDb = 80.0;
 
constexpr float desiredoutput = 0.5f;
constexpr int16_t gainedSignalTarget = INT16_MAX * desiredoutput;
 
struct SoundStruct
{
  /*
   * raw data
   */
 
  bool isDataValid = false;
 
  static constexpr auto SAMPLE_SIZE = hal::microphone::PdmData::SAMPLE_SIZE;
 
  std::array<int16_t, SAMPLE_SIZE> data;
  std::array<int16_t, SAMPLE_SIZE> rectifiedData;
 
  float sound_level_Db = 0.0f;
  float maxAmplitude = 0.0f;
  float maxAmplitudeFrequency = 0.0f;
 
  /*
   * FFT
   */
 
  bool isFFTValid = false;
 
  static constexpr uint8_t numberOfFFtChanels = 24;
 
  static constexpr float get_fft_resolution_Hz() { return common::fft::SAMPLE_RATE / static_cast<float>(SAMPLE_SIZE); }
 
  // FFT results
 
  std::array<float, SAMPLE_SIZE / 2> fft_raw;
  std::array<float, numberOfFFtChanels> fft_log;
  std::array<float, numberOfFFtChanels> fft_log_end_frequencies;
};
 
bool enable();
 
void disable();
 
void disable_after_non_use();
 
SoundStruct& get_sound_characteristics();
 
} // namespace microphone
} // namespace component
} // namespace lampda
 
#endif