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numCrossing=0; //initialize your number of zero crossings to 0 for (p=0;p<1000;p+=4) { if (audioData[p]>0 && audioData[p+1]<=0) numCrossing++; if (audioData[p]<0 && audioData[p+1]>=0) numCrossing++; if (audioData[p+1]>0 && audioData[p+2]<=0) numCrossing++; if (audioData[p+1]<0 && audioData[p+2]>=0) numCrossing++; if (audioData[p+2]>0 && audioData[p+3]<=0) numCrossing++; if (audioData[p+2]<0 && audioData[p+3]>=0) numCrossing++; if (audioData[p+3]>0 && audioData[p+4]<=0) numCrossing++; if (audioData[p+3]<0 && audioData[p+4]>=0) numCrossing++; }//for p for (p=(bufferSize/4)*4;p0 && audioData[p+1]<=0) numCrossing++; if (audioData[p]<0 && audioData[p+1]>=0) numCrossing++; } frequency=numCrossing*4; // Sampling at 8KHz and using 1000 samples thus the number of zero crossings //should be multiplied by 8 in order to get the numCrossings/second. //This number is divided by 2 to get the frequency(waves/sec) since 1 wave=2 zero crossings.