FFTAnalyzerInput

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ArduinoSound

FFTAnalyzer.input()

Description

Set the input of the analyzer

Syntax

fftAnalyzer.input(in);

Parameters

in: input to analyze (type AudioIn)

Returns

0 on failure, 1 on success

Example

/*
This example reads audio data from an Invensense's ICS43432 I2S microphone
breakout board, and prints out the spectrum to the Serial console. The
Serial Plotter built into the Arduino IDE can be used to plot the audio
amplitude data (Tools -> Serial Plotter)

Circuit:
* Arduino/Genuino Zero, MKRZero or MKR1000 board
* ICS43432:
* GND connected GND
* 3.3V connected 3.3V (Zero) or VCC (MKR1000, MKRZero)
* WS connected to pin 0 (Zero) or pin 3 (MKR1000, MKRZero)
* CLK connected to pin 1 (Zero) or pin 2 (MKR1000, MKRZero)
* SD connected to pin 9 (Zero) or pin A6 (MKR1000, MKRZero)

created 21 November 2016
by Sandeep Mistry
*/

#include <ArduinoSound.h>

// sample rate for the input
const int sampleRate = 8000;

// size of the FFT to compute
const int fftSize = 128;

// size of the spectrum output, half of FFT size
const int spectrumSize = fftSize / 2;

// array to store spectrum output
int spectrum[spectrumSize];

// create an FFT analyzer to be used with the I2S input
FFTAnalyzer fftAnalyzer(fftSize);

void setup() {
// Open serial communications and wait for port to open:
// A baud rate of 115200 is used instead of 9600 for a faster data rate
// on non-native USB ports
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}

// setup the I2S audio input for the sample rate with 32-bits per sample
if (!AudioInI2S.begin(sampleRate, 32)) {
Serial.println("Failed to initialize I2S input!");
while (1); // do nothing
}

// configure the I2S input as the input for the FFT analyzer
if (!fftAnalyzer.input(AudioInI2S)) {
Serial.println("Failed to set FFT analyzer input!");
while (1); // do nothing
}
}

void loop() {
// check if a new analysis is available
if (fftAnalyzer.available()) {
// read the new spectrum
fftAnalyzer.read(spectrum, spectrumSize);

// print out the spectrum
for (int i = 0; i < spectrumSize; i++) {
Serial.print((i * sampleRate) / fftSize); // the starting frequency
Serial.print("\t"); //
Serial.println(spectrum[i]); // the spectrum value
}
}
}

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