Provides real-time FFT analysis of microphone signals. More...

#include <MicrophoneFourier_DMA.h>

Inheritance diagram for MicrophoneFourier:

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Collaboration diagram for MicrophoneFourier:

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Static Public Member Functions
static void	Initialize (uint8_t pin, uint32_t sampleRate, float minDB, float maxDB)
	Initializes the microphone and FFT system with basic parameters.

static void	Initialize (uint8_t pin, uint8_t gain_pin, uint32_t sampleRate, float minDB, float maxDB, bool microphoneGain_50db)
	Initializes the microphone and FFT system with advanced parameters.

static void	setSamplingRate (uint32_t sampleRate)
	Sets the sampling rate for the microphone.

static void	setMicGain (bool is50db)
	Sets the microphone gain.

static void	UpdateDMA ()
	Updates the DMA system to process new samples.

static void	Initialize (uint8_t pin, uint16_t sampleRate, float minDB, float maxDB, float refreshRate=60.0f)
	Initializes the microphone and FFT system.

static void	Reset ()
	Resets the microphone system and clears stored data.

static void	Update ()
	Updates the microphone system, processing new samples and performing FFT.

Static Public Member Functions inherited from MicrophoneFourierBase
static float	AverageMagnitude (uint16_t binL, uint16_t binH)
	Calculates the average magnitude of the specified FFT bins.

static bool	IsInitialized ()
	Checks if the microphone system is initialized.

static float	GetSampleRate ()
	Retrieves the current sampling rate.

static float *	GetSamples ()
	Retrieves the raw input samples.

static float *	GetFourier ()
	Retrieves the FFT output data.

static float *	GetFourierFiltered ()
	Retrieves the filtered FFT output data.

static float	GetCurrentMagnitude ()
	Retrieves the current signal magnitude.

Static Private Member Functions
static void	window_raw_fft_data (void buffer, const void window)
	Applies a Hanning window to raw FFT data.

static void	SamplerCallback (AnalogBufferDMA *dma_buffer_instance, int8_t adc_num)
	Callback function for DMA sampling.

static void	SamplerCallback ()
	Callback function for the sampling timer.

static void	StartSampler ()
	Starts the sampling process using the IntervalTimer.

Static Private Attributes
static const int16_t	Hanning256 []
	Hanning window coefficients for FFT.

static bool	microphoneGain_50db = false
	Flag to enable or disable 50dB microphone gain.

static uint8_t	gain_pin = 0
	Pin number for gain control (if applicable).

static IntervalTimer	sampleTimer
	Timer for managing sampling intervals.

static TimeStep	timeStep = TimeStep(60)
	Time step utility for controlling updates.

static uint16_t	samples = 0
	Number of samples collected in the current cycle.

static uint16_t	samplesStorage = 0
	Total number of samples stored.

static float	refreshRate = 60.0f
	Refresh rate for processing in Hz.

static bool	samplesReady = false
	Flag indicating if samples are ready for processing.

static uint16_t	frequencyBins [OutputBins]
	Array for storing frequency bin data.

Additional Inherited Members
Static Protected Attributes inherited from MicrophoneFourierBase
static const uint16_t	FFTSize = 256
	Size of the FFT (number of samples).

static const uint16_t	OutputBins = 128
	Number of output bins from FFT processing.

static uint16_t	sampleRate = 8000
	Sampling rate in Hz.

static uint8_t	pin = 0
	Pin number for microphone input.

static float	minDB = 50.0f
	Minimum decibel value for normalization.

static float	maxDB = 120.0f
	Maximum decibel value for normalization.

static float	threshold = 400.0f
	Threshold value for processing.

static float	currentValue = 0.0f
	Current magnitude of the microphone signal.

static bool	isInitialized = false
	Flag indicating if the system is initialized.

static DerivativeFilter	peakFilterRate
	Filter for peak rate detection.

static float	inputSamp [FFTSize *2]
	Raw input samples for FFT.

static float	inputStorage [FFTSize]
	Storage for processed input samples.

static float	outputMagn [FFTSize]
	Magnitude output from FFT.

static float	outputData [OutputBins]
	Processed FFT data for output bins.

static float	outputDataFilt [OutputBins]
	Filtered FFT data for output bins.

static FFTFilter	fftFilters [OutputBins]
	Array of FFT filters for post-processing.

static FFT< FFTSize >	fft
	FFT processor instance.

Detailed Description

Provides real-time FFT analysis of microphone signals.

Provides real-time microphone analysis using FFT.

The MicrophoneFourier class leverages DMA and FFT techniques to analyze microphone input signals in real time. It supports configurable sampling rates, gain control, and signal processing.

The MicrophoneFourier class extends MicrophoneFourierBase to add capabilities for real-time sampling, signal processing, and frequency bin analysis. It enables dynamic updating and resetting of the microphone system.

Definition at line 27 of file MicrophoneFourier_DMA.h.

Member Function Documentation

◆ Initialize() [1/3]

void Initialize	(	uint8_t	pin,
		uint16_t	sampleRate,
		float	minDB,
		float	maxDB,
		float	refreshRate = `60.0f`
	)

static

Initializes the microphone and FFT system.

Parameters

pin	The pin connected to the microphone.
sampleRate	The desired sampling rate in Hz.
minDB	Minimum dB level for normalization.
maxDB	Maximum dB level for normalization.
refreshRate	The desired refresh rate for processing (default is 60 Hz).

Definition at line 35 of file MicrophoneFourier_MAX9814.cpp.

References MicrophoneFourierBase::FFTSize, frequencyBins, MicrophoneFourierBase::isInitialized, MicrophoneFourierBase::maxDB, MicrophoneFourierBase::minDB, MicrophoneFourierBase::OutputBins, MicrophoneFourierBase::pin, refreshRate, MicrophoneFourierBase::sampleRate, samples, samplesReady, TimeStep::SetFrequency(), StartSampler(), and timeStep.

◆ Initialize() [2/3]

void Initialize	(	uint8_t	pin,
		uint32_t	sampleRate,
		float	minDB,
		float	maxDB
	)

static

Initializes the microphone and FFT system with basic parameters.

Parameters

pin	Pin number connected to the microphone output.
sampleRate	Sampling rate in Hz.
minDB	Minimum dB level for normalization.
maxDB	Maximum dB level for normalization.

Definition at line 314 of file MicrophoneFourier_DMA.cpp.

References adc, adc_dma_instance(), MicrophoneFourierBase::isInitialized, MicrophoneFourierBase::maxDB, MicrophoneFourierBase::minDB, MicrophoneFourierBase::pin, and MicrophoneFourierBase::sampleRate.

Referenced by AlphaAnimation::Initialize(), ProtogenProject::Initialize(), MyntAnimation::MyntAnimation(), SergaliciousAnimation::SergaliciousAnimation(), and TechSaneAnimation::TechSaneAnimation().

◆ Initialize() [3/3]

void Initialize	(	uint8_t	pin,
		uint8_t	gain_pin,
		uint32_t	sampleRate,
		float	minDB,
		float	maxDB,
		bool	microphoneGain_50db
	)

static

Initializes the microphone and FFT system with advanced parameters.

Parameters

pin	Pin number connected to the microphone output.
gain_pin	Pin number for gain control.
sampleRate	Sampling rate in Hz.
minDB	Minimum dB level for normalization.
maxDB	Maximum dB level for normalization.
microphoneGain_50db	Flag to enable or disable 50dB microphone gain.