I want to be able to get the frequency out of some audio do detect gender. I am using C# and the Unity engine.



void Update ()
{

if(listener.enabled)
{
AudioListener.GetSpectrumData(number, 0,FFTWindow.BlackmanHarris);

for(int i=0; i < numSamples; i++)
{
int newHertz = Mathf.RoundToInt (Mathf.Clamp (number * 2, 0, AudioSettings.outputSampleRate) / (AudioSettings.outputSampleRate / numSamples));

if(newHertz >=100 && newHertz <= 150)
bMan = true;
else if(newHertz >= 170 && newHertz <= 220)
bWoman = true;
else
bGender = false;

if(newHertz > peakData.Hertz)
peakData.Hertz = newHertz;
}
}
}



I thought this would work but it does not, can anyone point me i0n the right direction?


void Update ()
{

if(listener.enabled)

{

AudioListener.GetOutputData(number, 0);

for(int i=0; i < numSamples; i++)

{

int newHertz = Mathf.RoundToInt (Mathf.Clamp (number * 2, 0, AudioSettings.outputSampleRate) / (AudioSettings.outputSampleRate / numSamples));

if(newhertz >=100 && newHertz <= 150)

bMan = true;

else if(newHertz >= 170 && newHertz <= 220)

bWoman = true;

else

bGender = false;

}

}

}



I don't know if it would work and if it did it is not doing what you think it is. It will only store the last time newHertz was checked. I would try it like this:


int newHertz = 0;

for (numsamples with i)
{
//NOTE THE += and not =
newHertz += do calculation
}
newHertz /= numsamples;
if (newHerz ....)
male
else if (newHerz ....
female
else
none



[quote name='johnboy007' timestamp='1313423805' post='4849432']
I want to be able to get the frequency out of some audio do detect gender. I am using C# and the Unity engine.

There is no unique frequency you can get out of a audio file/stream. You can try to Fourier transform the input and then analyze the "spectrum".

I don't get at all what you are trying to do in your code? You are trying to calculate the gender inside the loop for every audio sample? The audio samples are an amplitude so to speak. So you can't get a frequency from a single sample. Also the whole upper bound of the clamp "AudioSettings.outputSampleRate) / (AudioSettings.outputSampleRate / numSamples)" is just a fancy way to write "numSamples" + some integer rounding error?

Edit: after the ninja edit it makes more sense. I still don't get why you are clamping the result. Basically what you want to do is search for the max amplitude.


void Update ()
{

if(listener.enabled)
{
AudioListener.GetSpectrumData(number, 0,FFTWindow.BlackmanHarris);

double max = 0;
int maxpos = 0;
for(int i=0; i < numSamples; i++)
{
if(Mathf.Abs(number)>max)
{
max = Mathf.Abs(number);
maxpos = i;
}
}
double frequency = maxpos*AudioSettings.outputSampleRate/numSamples;
//...

}
}


[/quote]
Thank you for your reply:
I have now added this to get my frequency, and i have 2 test wav files, man and woman and the womans is higher but both output value are alot higher than i expected, i like 22500 hertz, going to see if i can find a wav file that outputs just 500 hertz and see if it is calibrated right?

Well, I don't have experience with unity and just assumed the spectrum data would return a fourier transform that's why I put that scaling factor there. What happens when you just write "frequency = maxpos"?

I have downloaded and tested it with a wav file that outputs 500hz

If i do fequency = maxpos with numsample that = 256 the frequency is showing as 5

Then i thought well i really need to up the numsamples to test so i put that to 512 and my freq is 10 not 500? Has anyone got any ideas why?