ext_analysis.cpp File Reference

#include <FastLED.h>
#include <Arduino.h>
#include "patterns.h"
#include "nanolux_types.h"
#include "nanolux_util.h"
#include <cmath>

Functions
double *	density_formant ()
	Calculates the frequency bands with the highest density.
double *	band_split_bounce (int len)
	Outputs the average volume of 5 buckets given a sample length.
void	temp_to_array (double *temp, double *arr, int len)
	Used for moving a temporary pointer into another pointer.
void	update_formants ()
	Moves data from the formant calculation function to the global array.
void	update_five_band_split (int len)
	Moves data from the 5-band-split calculation function to the global array.
VowelSounds	vowel_detection ()
	Detects vowels based off of formants.

Variables
double	volume
	Global variable used to access the current volume.
double	peak
	Global variable used to store preak audio frequency.
double	vReal [SAMPLES]
int	F0arr [20]
	Used for smoothing (old) formant processing.
int	F1arr [20]
	Used for smoothing (old) formant processing.
int	F2arr [20]
	Used for smoothing (old) formant processing.
int	formant_pose
	Used for smoothing (old) formant processing.
double	formants [3]
	Global formant array, used for accessing.
double	fbs [5]

Detailed Description

This file's functions perform advanced audio processing.

Many of the functions defined here use values calculated from core_analysis.h to perform more complex audio analysis.

Function Documentation

band_split_bounce()

double * band_split_bounce

(

int

len

)

Outputs the average volume of 5 buckets given a sample length.

Parameters

len	The number of samples the buckets should stretch across.

This function totals up the volume inside all 5 buckets, averages them, then maps them to the allowed volume range.

density_formant()

double * density_formant

(

)

Calculates the frequency bands with the highest density.

Returns

An array of the highest density formants.

This is intended to be used for functions like vowel detection, and is used in a couple patterns. For any nontrivial applications, do not use this.

temp_to_array()

void temp_to_array	(	double *	temp,
		double *	arr,
		int	len )

Used for moving a temporary pointer into another pointer.

Parameters

temp	The temporary pointer to copy from.
arr	The global pointer to copy to.
len	The number of elements to copy.

Automatically deletes temp after copy is finished.

Intended to be used to copy temporary audio analysis pointer data into global arrays.

Variable Documentation

fbs

double fbs[5]

extern

Global FIVE BAND SPLIT which stores changing bands based on raw frequencies

peak

double peak

extern

Global variable used to store preak audio frequency.

Global variable used to store preak audio frequency.

volume

double volume

extern

Global variable used to access the current volume.

Global variable used to access the current volume.

vReal

double vReal[SAMPLES]

extern

Array to store both sampled and FFT'ed audio. Processing is done in place.