phoneme.cpp

#include "uspeech.h"
char signal::getPhoneme()
{
#ifdef ARDUINO_ENVIRONMENT
    sample();
#endif
    unsigned int pp =power();
    //Serial.print(F("pp=")); Serial.println(pp);
    if (pp>SILENCE) {
    //Perform Division
    int k = complexity(pp);
    //Low pass filter for noise removal
    overview[6] = overview[5];
    overview[5] = overview[4];
    overview[4] = overview[3];
    overview[3] = overview[2];
    overview[2] = overview[1];
    overview[1] = overview[0];
    overview[0] = k;

    int coeff = 0;
    for (uint8_t f=0; f<6; f++) {
        coeff += overview[f];
    }
    coeff /= 7;

    micPower = 0.05 * maxPower() + (1 - 0.05) * micPower;
    if (micPower < micPowerThreshold) {
        return ' ';
    }

    testCoeff = coeff;
    //Serial.print(F("coeff: ")); Serial.println(coeff); //Use this for debugging

    //Twiddle with the numbers here if your getting false triggers
    //This is the main classifier part

    if (coeff<econstant) { /*Default value = 2*/
        phoneme = 'e';
    } else if (coeff<aconstant) { /*Default value = 4*/
        phoneme = 'o';
    } else if (coeff<vconstant) { /*Default value = 6*/
        phoneme = 'v';
    } else if (coeff<shconstant) { /*Default value = 10*/
        phoneme = 'h';
    } else {
        phoneme = 's';
    }

    if (f_enabled) {
        //Serial.print(F("micPower: ")); Serial.println(micPower);
        if (micPower > fconstant) {
        return 'f';
        }
    }

    return phoneme;

    }

    micPower = 0;
    testCoeff = 0;
    return ' ';
}