Marcio Tamagushi
Published © GPL3+

Speech Recognition and Synthesis with Arduino

Implements speech recognition and synthesis using an Arduino DUE.

BeginnerFull instructions provided75,894
Speech Recognition and Synthesis with Arduino

Things used in this project

Hardware components

Arduino Due
Arduino Due
×1
SparkFun Electret Microphone Breakout
×1
SparkFun Mono Audio Amp Breakout
×1
Speaker: 0.25W, 8 ohms
Speaker: 0.25W, 8 ohms
×1
Breadboard (generic)
Breadboard (generic)
×1
5 mm LED: Red
5 mm LED: Red
×3
Resistor 330 ohm
Resistor 330 ohm
×3
Jumper wires (generic)
Jumper wires (generic)
×1

Software apps and online services

BitVoicer Server 1.0

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Schematics

Fritzing Schematics

Code

Arduino Sketch

Arduino
#include <BVSP.h>
#include <BVSMic.h>
#include <BVSSpeaker.h>
#include <DAC.h>

// Defines the Arduino pin that will be used to capture audio 
#define BVSM_AUDIO_INPUT 7

// Defines the LED pins
#define RED_LED_PIN 6
#define YELLOW_LED_PIN 9
#define GREEN_LED_PIN 10

// Defines the constants that will be passed as parameters to 
// the BVSP.begin function
const unsigned long STATUS_REQUEST_TIMEOUT = 3000;
const unsigned long STATUS_REQUEST_INTERVAL = 4000;

// Defines the size of the mic audio buffer 
const int MIC_BUFFER_SIZE = 64;

// Defines the size of the speaker audio buffer
const int SPEAKER_BUFFER_SIZE = 128;

// Defines the size of the receive buffer
const int RECEIVE_BUFFER_SIZE = 2;

// Initializes a new global instance of the BVSP class 
BVSP bvsp = BVSP();

// Initializes a new global instance of the BVSMic class 
BVSMic bvsm = BVSMic();

// Initializes a new global instance of the BVSSpeaker class 
BVSSpeaker bvss = BVSSpeaker();

// Creates a buffer that will be used to read recorded samples 
// from the BVSMic class 
byte micBuffer[MIC_BUFFER_SIZE];

// Creates a buffer that will be used to write audio samples 
// into the BVSSpeaker class 
byte speakerBuffer[SPEAKER_BUFFER_SIZE];

// Creates a buffer that will be used to read the commands sent
// from BitVoicer Server.
// Byte 0 = pin number
// Byte 1 = pin value
byte receiveBuffer[RECEIVE_BUFFER_SIZE];

// These variables are used to control when to play
// "LED Notes". These notes will be played along with 
// the song streamed from BitVoicer Server.
bool playLEDNotes = false;
unsigned int playStartTime = 0;

void setup() 
{
  // Sets up the pin modes
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(YELLOW_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);

  // Sets the initial state of all LEDs
  digitalWrite(RED_LED_PIN, LOW);
  digitalWrite(YELLOW_LED_PIN, LOW);
  digitalWrite(GREEN_LED_PIN, LOW);
  
  // Starts serial communication at 115200 bps 
  Serial.begin(115200); 
  
  // Sets the Arduino serial port that will be used for 
  // communication, how long it will take before a status request 
  // times out and how often status requests should be sent to 
  // BitVoicer Server. 
  bvsp.begin(Serial, STATUS_REQUEST_TIMEOUT, STATUS_REQUEST_INTERVAL);
    
  // Defines the function that will handle the frameReceived 
  // event 
  bvsp.frameReceived = BVSP_frameReceived;

  // Sets the function that will handle the modeChanged 
  // event 
  bvsp.modeChanged = BVSP_modeChanged; 
  
  // Sets the function that will handle the streamReceived 
  // event 
  bvsp.streamReceived = BVSP_streamReceived;
  
  // Prepares the BVSMic class timer 
  bvsm.begin();

  // Sets the DAC that will be used by the BVSSpeaker class 
  bvss.begin(DAC);
}

void loop() 
{
  // Checks if the status request interval has elapsed and if it 
  // has, sends a status request to BitVoicer Server 
  bvsp.keepAlive();
  
  // Checks if there is data available at the serial port buffer 
  // and processes its content according to the specifications 
  // of the BitVoicer Server Protocol 
  bvsp.receive();

  // Checks if there is one SRE available. If there is one, 
  // starts recording.
  if (bvsp.isSREAvailable()) 
  {
    // If the BVSMic class is not recording, sets up the audio 
    // input and starts recording 
    if (!bvsm.isRecording)
    {
      bvsm.setAudioInput(BVSM_AUDIO_INPUT, DEFAULT); 
      bvsm.startRecording();
    }

    // Checks if the BVSMic class has available samples 
    if (bvsm.available)
    {
      // Makes sure the inbound mode is STREAM_MODE before 
      // transmitting the stream
      if (bvsp.inboundMode == FRAMED_MODE)
        bvsp.setInboundMode(STREAM_MODE); 
        
      // Reads the audio samples from the BVSMic class
      int bytesRead = bvsm.read(micBuffer, MIC_BUFFER_SIZE);
      
      // Sends the audio stream to BitVoicer Server
      bvsp.sendStream(micBuffer, bytesRead);
    }
  }
  else
  {
    // No SRE is available. If the BVSMic class is recording, 
    // stops it.
    if (bvsm.isRecording)
      bvsm.stopRecording();
  }

  // Plays all audio samples available in the BVSSpeaker class
  // internal buffer. These samples are written in the 
  // BVSP_streamReceived event handler. If no samples are 
  // available in the internal buffer, nothing is played.
  bvss.play();

  // If playLEDNotes has been set to true, 
  // plays the "LED notes" along with the music.
  if (playLEDNotes)
    playNextLEDNote();
}

// Handles the frameReceived event 
void BVSP_frameReceived(byte dataType, int payloadSize) 
{
  // Checks if the received frame contains binary data
  // 0x07 = Binary data (byte array)
  if (dataType == DATA_TYPE_BINARY)
  {
    // If 2 bytes were received, process the command.
    if (bvsp.getReceivedBytes(receiveBuffer, RECEIVE_BUFFER_SIZE) == 
      RECEIVE_BUFFER_SIZE)
    {
      analogWrite(receiveBuffer[0], receiveBuffer[1]);
    }
  }
  // Checks if the received frame contains byte data type
  // 0x01 = Byte data type
  else if (dataType == DATA_TYPE_BYTE)
  {   
    // If the received byte value is 255, sets playLEDNotes
    // and marks the current time.
    if (bvsp.getReceivedByte() == 255)
    {
      playLEDNotes = true;
      playStartTime = millis();
    }
  }
}

// Handles the modeChanged event 
void BVSP_modeChanged() 
{ 
  // If the outboundMode (Server --> Device) has turned to 
  // FRAMED_MODE, no audio stream is supposed to be received. 
  // Tells the BVSSpeaker class to finish playing when its 
  // internal buffer become empty. 
  if (bvsp.outboundMode == FRAMED_MODE)
    bvss.finishPlaying();
} 

// Handles the streamReceived event 
void BVSP_streamReceived(int size) 
{ 
  // Gets the received stream from the BVSP class 
  int bytesRead = bvsp.getReceivedStream(speakerBuffer, 
    SPEAKER_BUFFER_SIZE); 
    
  // Enqueues the received stream to play
  bvss.enqueue(speakerBuffer, bytesRead);
}

// Lights up the appropriate LED based on the time 
// the command to start playing LED notes was received.
// The timings used here are syncronized with the music.
void playNextLEDNote()
{
  // Gets the elapsed time between playStartTime and the 
  // current time.
  unsigned long elapsed = millis() - playStartTime;

  // Turns off all LEDs
  allLEDsOff();

  // The last note has been played.
  // Turns off the last LED and stops playing LED notes.
  if (elapsed >= 11500)
  {
    analogWrite(RED_LED_PIN, 0);
    playLEDNotes = false;
  }
  else if (elapsed >= 9900)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 9370)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 8900)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 8610)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 8230)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 7970)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 7470)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 6760)
    analogWrite(GREEN_LED_PIN, 255); // E note
  else if (elapsed >= 6350)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 5880)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 5560)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 5180)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 4890)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 4420)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 3810)
    analogWrite(GREEN_LED_PIN, 255); // E note
  else if (elapsed >= 3420)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 2930)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 2560)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 2200)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 1930)
    analogWrite(YELLOW_LED_PIN, 255); // D note
  else if (elapsed >= 1470)
    analogWrite(RED_LED_PIN, 255); // C note
  else if (elapsed >= 1000)
    analogWrite(GREEN_LED_PIN, 255); // E note
}

// Turns off all LEDs.
void allLEDsOff()
{
  analogWrite(RED_LED_PIN, 0);
  analogWrite(YELLOW_LED_PIN, 0);
  analogWrite(GREEN_LED_PIN, 0);
}

Credits

Marcio Tamagushi

Marcio Tamagushi

3 projects • 48 followers

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