signal.cpp

#include "uspeech.h"


signal::signal(int port){
    pin = port;
    fconstant = F_CONSTANT;
    econstant = 2;
    aconstant = 4;
    vconstant = 6;
    shconstant = 10;
    amplificationFactor = 10;
    micPowerThreshold = 50;
    scale = 1;
}
void signal::calibrate(){
#ifdef ARDUINO_ENVIRONMENT 
    calib = 0;
    uint32_t samp=0;
    for (uint16_t ind=0; ind<10000; ind++) {
    //acquire background noise
    samp += analogRead(pin) * scale;
    }
    calib = samp/10000;
#endif
}
void signal::sample(){
    int i = 0;
    while ( i < 32){
#ifdef ARDUINO_ENVIRONMENT
        arr[i] = (analogRead(pin)*scale-calib);
#endif
        i++;
    }
    
}
unsigned int signal::power(){
    unsigned int j = 0;
    uint8_t i = 0;
    while(i<32){
        j+=abs(arr[i]);
        i++;
    }
    return j;
}
unsigned int signal::complexity(int power){
    unsigned int j = 0;
    uint8_t i = 1;
    while(i<32){
        j+=abs(arr[i]-arr[i-1]);
        i++;
    }
    //Serial.println(j);
    return (j*amplificationFactor)/power;
}


unsigned int signal::maxPower()
{
    int i =0;
    unsigned int max = 0;
    while (i<32){
        if(max<abs(arr[i])){
            max = abs(arr[i]);
            maxPos = i;
        }
        i++;
        avgPower+=arr[i];
    }
    avgPower /= 32;
    return max;
}
int signal::snr(int power){
    uint8_t i=0,j=0;
    int mean =power/32;
    while(i <32){
        j+=sq(arr[i]-mean);
        i++;
    }
    return sqrt(j/mean)/power;
}