Audio input to binary

Hi,
I am trying to get a binary sequence from an audio stream.
In short, I would need to speak into a mic and having as output a sequence of 1 and 0 according to the audio signal.
if there are no sound I shouldn’t get any number
At the moment it seems that I keep on receiving data…
I thought it was a straightforward thing to do but I might be lost.

I started with the standard ofSoundStream then switched to ofxFFT.

here is the code that I am using. If anybody had a suggestion that would be great!
thanks.

void ofApp::setup(){

ofSetBackgroundAuto(true);



///...FFT/////

fftLive.setMirrorData(false);
fftLive.setup();

}

//--------------------------------------------------------------
void ofApp::update(){

fftLive.update();

myBinary = fftLive.getFftRawData();

audioData = new float[myBinary.size()];

fftLive.getFftPeakData(audioData, myBinary.size());

delete[] audioData;

}

//--------------------------------------------------------------
void ofApp::draw(){

if (fftLive.getFftNormData().size()>0) {
    ofDrawBitmapStringHighlight(ofToBinary(audioData),0,100);
    ofDrawBitmapStringHighlight("binary Size "+ofToString(myBinary),0,120);
    
}




ofSetColor(255);

int w = OFX_FFT_WIDTH;
int h = OFX_FFT_HEIGHT;
int x = 20;
int y = ofGetHeight() - h - 20;
fftLive.draw(x, y, w, h);

}