Base class for FFT-based microphone signal processing. More...

#include <MicrophoneFourierBase.h>

Inheritance diagram for MicrophoneFourierBase:

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Collaboration diagram for MicrophoneFourierBase:

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Static Public Member Functions
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 Protected Attributes
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

Base class for FFT-based microphone signal processing.

The MicrophoneFourierBase class provides foundational support for microphone signal processing, including FFT transformations, signal normalization, and filtering. Derived classes can extend its functionality for specific applications.

Definition at line 29 of file MicrophoneFourierBase.h.

Member Function Documentation

◆ AverageMagnitude()

float AverageMagnitude	(	uint16_t	binL,
		uint16_t	binH
	)

static

Calculates the average magnitude of the specified FFT bins.

Parameters

binL	The lower bound of the bin range (inclusive).
binH	The upper bound of the bin range (inclusive).

Returns: The average magnitude within the specified range.

Definition at line 23 of file MicrophoneFourierBase.cpp.

References FFTSize, and outputMagn.

Referenced by MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ GetCurrentMagnitude()

float GetCurrentMagnitude ( )

static

Retrieves the current signal magnitude.

Returns: The current magnitude value.

Definition at line 54 of file MicrophoneFourierBase.cpp.

References threshold.

◆ GetFourier()

float * GetFourier ( )

static

Retrieves the FFT output data.

Returns: Pointer to the array of FFT output data.

Definition at line 46 of file MicrophoneFourierBase.cpp.

References outputData.

◆ GetFourierFiltered()

float * GetFourierFiltered ( )

static

Retrieves the filtered FFT output data.

Returns: Pointer to the array of filtered FFT output data.

Definition at line 50 of file MicrophoneFourierBase.cpp.

References outputDataFilt.

◆ GetSampleRate()

float GetSampleRate ( )

static

Retrieves the current sampling rate.

Returns: The sampling rate in Hz.

Definition at line 38 of file MicrophoneFourierBase.cpp.

References sampleRate.

Referenced by ArtleckAnimationV2::UpdateFFTVisemes(), ElGatoAnimation::UpdateFFTVisemes(), LeonHuskyAnimation::UpdateFFTVisemes(), MyntAnimation::UpdateFFTVisemes(), ProtobottAnimation::UpdateFFTVisemes(), SergaliciousAnimation::UpdateFFTVisemes(), TechSaneAnimation::UpdateFFTVisemes(), VesperAnimation::UpdateFFTVisemes(), WaffleDaProtoAnimation::UpdateFFTVisemes(), WarzoneAnimation::UpdateFFTVisemes(), AlphaAnimation::UpdateFFTVisemes(), and ProtogenProject::UpdateFFTVisemes().

◆ GetSamples()

float * GetSamples ( )

static

Retrieves the raw input samples.

Returns: Pointer to the array of raw input samples.

Definition at line 42 of file MicrophoneFourierBase.cpp.

References inputStorage.

Referenced by ProtogenProject::OscilloscopeFace(), SergaliciousAnimation::Update(), and TechSaneAnimation::Update().

◆ IsInitialized()

bool IsInitialized ( )

static

Checks if the microphone system is initialized.

Returns: True if initialized, false otherwise.

Definition at line 34 of file MicrophoneFourierBase.cpp.

References isInitialized.

Member Data Documentation

◆ currentValue

float currentValue = 0.0f

staticprotected

Current magnitude of the microphone signal.

Definition at line 38 of file MicrophoneFourierBase.h.

◆ fft

FFT< MicrophoneFourierBase::FFTSize > fft

staticprotected

FFT processor instance.

Definition at line 50 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ fftFilters

FFTFilter fftFilters

staticprotected

Array of FFT filters for post-processing.

Definition at line 48 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ FFTSize

const uint16_t FFTSize = 256

staticprotected

Size of the FFT (number of samples).

Definition at line 31 of file MicrophoneFourierBase.h.

Referenced by AverageMagnitude(), MicrophoneFourier::Initialize(), MicrophoneFourier::Reset(), and MicrophoneFourier::SamplerCallback().

◆ inputSamp

float inputSamp

staticprotected

Raw input samples for FFT.

Definition at line 43 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Reset(), MicrophoneFourier::SamplerCallback(), MicrophoneFourier::SamplerCallback(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ inputStorage

float inputStorage

staticprotected

Storage for processed input samples.

Definition at line 44 of file MicrophoneFourierBase.h.

Referenced by GetSamples(), MicrophoneFourier::SamplerCallback(), MicrophoneFourier::SamplerCallback(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ isInitialized

bool isInitialized = false

staticprotected

Flag indicating if the system is initialized.

Definition at line 39 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), and IsInitialized().

◆ maxDB

float maxDB = 120.0f

staticprotected

Maximum decibel value for normalization.

Definition at line 36 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ minDB

float minDB = 50.0f

staticprotected

Minimum decibel value for normalization.

Definition at line 35 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ OutputBins

const uint16_t OutputBins = 128

staticprotected

Number of output bins from FFT processing.

Definition at line 32 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Initialize(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ outputData

float outputData

staticprotected

Processed FFT data for output bins.

Definition at line 46 of file MicrophoneFourierBase.h.

Referenced by GetFourier(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ outputDataFilt

float outputDataFilt

staticprotected

Filtered FFT data for output bins.

Definition at line 47 of file MicrophoneFourierBase.h.

Referenced by GetFourierFiltered(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ outputMagn

float outputMagn

staticprotected

Magnitude output from FFT.

Definition at line 45 of file MicrophoneFourierBase.h.

Referenced by AverageMagnitude(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ peakFilterRate

DerivativeFilter peakFilterRate

staticprotected

Filter for peak rate detection.

Definition at line 41 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

◆ pin

uint8_t pin = 0

staticprotected

Pin number for microphone input.

Definition at line 34 of file MicrophoneFourierBase.h.

Referenced by MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), and MicrophoneFourier::SamplerCallback().

◆ sampleRate

uint16_t sampleRate = 8000

staticprotected

Sampling rate in Hz.

Definition at line 33 of file MicrophoneFourierBase.h.

Referenced by GetSampleRate(), MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::Initialize(), MicrophoneFourier::setSamplingRate(), and MicrophoneFourier::StartSampler().

◆ threshold

float threshold = 400.0f

staticprotected

Threshold value for processing.

Definition at line 37 of file MicrophoneFourierBase.h.

Referenced by GetCurrentMagnitude(), MicrophoneFourier::Update(), and MicrophoneFourier::UpdateDMA().

The documentation for this class was generated from the following files:

Static Public Member Functions

Static Protected Attributes

Detailed Description

Member Function Documentation

◆ AverageMagnitude()

◆ GetCurrentMagnitude()

◆ GetFourier()

◆ GetFourierFiltered()

◆ GetSampleRate()

◆ GetSamples()

◆ IsInitialized()

Member Data Documentation

◆ currentValue

◆ fft

◆ fftFilters

◆ FFTSize

◆ inputSamp

◆ inputStorage

◆ isInitialized

◆ maxDB

◆ minDB

◆ OutputBins

◆ outputData

◆ outputDataFilt

◆ outputMagn

◆ peakFilterRate

◆ pin

◆ sampleRate

◆ threshold