public float[] getFeatures(IWindowData windowData) {
float[] data = windowData.getData(0);
float mean = mean(data);
float stdev = stDev(mean, data);
float[] fftMag = getFFTMag(data);
float meanFftMag = mean(fftMag);
float stDevFftMag = stDev(meanFftMag, fftMag);
// prev state
float notMoving = 0, cruise = 0, accelerating = 0, breaking = 0;
int prevState = (int) (windowData.getData(1)[0]);
if (prevState == SvmRecognizerIntentService.NOT_MOVING) {
notMoving = 1;
} else if (prevState == SvmRecognizerIntentService.CRUISE) {
cruise = 1;
} else if (prevState == SvmRecognizerIntentService.ACCELERATING) {
accelerating = 1;
} else if (prevState == SvmRecognizerIntentService.BREAKING) {
breaking = 1;
}
return new float[] {
mean, stdev, meanFftMag, stDevFftMag,
notMoving, cruise, accelerating, breaking
};
}
