Handle the microphone physical interface. More...

Classes
struct	SoundStruct
	Handle the analysis of a sound sample. This structure handled the FastFourrier analysis of a sound sample, sound strenght, sound most active frequency, ... More...

Functions
float	square (const float v)

float	decibel_A_scaling (const float frequency)
	Scaling for the DecibelA model.

float	decibel_B_scaling (const float frequency)
	Scaling for the DecibelB model.

float	decibel_C_scaling (const float frequency)
	Scaling for the DecibelC model.

bool	enable ()
	Start the microphone data analysis, if not already started.

void	disable ()
	Disable the microphone data analysis, if its running.

void	disable_after_non_use ()
	disable microphone if last used a target time ago

SoundStruct &	process_sound_data (const platform::microphone::PdmData &data)

SoundStruct &	get_sound_characteristics ()
	Compute and process sound data.

Variables
utils::fft::FftAnalyzer< platform::microphone::PdmData::SAMPLE_SIZE, SoundStruct::numberOfFFtChanels, float >	fftAnalyzer

bool	isStarted = false

uint32_t	lastMicFunctionCall = 0

float	autoGain = 1.0f

static constexpr float	minAutoGain = 0.0001f

static constexpr float	maxAutoGain = 30.0f

static constexpr float	distortionFactor = 0.00005f

static constexpr float	desiredoutputRMS = desiredoutput * desiredoutput

SoundStruct	soundStruct

constexpr float	silenceLevelDb = 30.0
	Decibel level for a silent room.

constexpr float	highLevelDb = 80.0
	Microphone is not good enough at after this.

constexpr float	desiredoutput = 0.5f
	Desired output of the auto gain (0-1)

constexpr int16_t	gainedSignalTarget = INT16_MAX * desiredoutput
	Desired output of the auto gain (0-INT16_MAX)

Detailed Description

Handle the microphone physical interface.

Function Documentation

bool lampda::physical::microphone::enable ( )

Start the microphone data analysis, if not already started.

SoundStruct & lampda::physical::microphone::get_sound_characteristics ( )

Compute and process sound data.