musicSimplifier

mp3 음원을 넣으면 간단하게 

다음과 같은 melody 와 damper 형태로 

추출해주는 audio proecessing and c

 

const int PIN = 15;

hw_timer_t* timer = NULL;
bool value = true;
int frequency = 20; // 20 to 20000

// music
int rest =0;
int melody[] = {294, 330, 392, 392, 392, 392, 392, 392, 392, 294, 330, 392, rest,
                392, 392, 392, 392, 392, 294, 330, 392, rest,
                392, 392, 392, 392, 392, 392, 392, 370, 370, rest};

int damper[] = {400, 400, 200, 200, 200, 100, 300, 100, 200, 200, 200, 100, 30,
                200, 100, 300, 100, 200, 200, 200, 100,  30,  
                200, 100, 300, 100, 200, 200, 200, 200, 200, 3000};

void IRAM_ATTR onTimer() {
  value = !value;
  digitalWrite(PIN, value); 
}

void setup() {
    Serial.begin(115200);
    pinMode(PIN, OUTPUT);    // sets the digital pin as output
    setupTimer();
}

void setupTimer() {
    // Use 1st timer of 4  - 1 tick take 1/(80MHZ/80) = 1us so we set divider 80 and count up 
    timer = timerBegin(0, 80, true);//div 80
    timerAttachInterrupt(timer, &onTimer, true);
}

void setFrequency(long frequencyHz){
    timerAlarmDisable(timer);
    timerAlarmWrite(timer, 1000000l / frequencyHz, true);
    timerAlarmEnable(timer);
}

void tone(long frequencyHz, long durationMs){
    setFrequency(frequencyHz);
    delay(durationMs);
}

void loop() {
    for(int a=0; a<32; a++) {
      tone(melody[a],damper[a]);
      delay(damper[a]+10);   
  }
}

 

https://www.codebug.org.uk/explore/codebug/15483/happy-birthday-tune/

CodeBug – happy birthday tune