Harmonic to noise ratio calculation

How can i calculate the harmonic to noise ratio of a signal?

Answer 1

[Chinmay Anand]

You can look into this link for this.

https://www.mathworks.com/help/signal/ref/snr.html

[Khandaker Noman]

Actually this calculates SNR, is there any function to calculate HNR?

[KALYAN ACHARJYA]

This is SNR, HNR is different.

Answer 2

[KALYAN ACHARJYA]

You can use this custom function to calculate harmonic to noise ratio (HNR)

To understand in detail theory, read here

[Li feng]

what is noOfFrames？

[KALYAN ACHARJYA]

Here

[Hyla Fourie]

Hmm I am not sure whether you are still active on this feed but I have read the resources and am still a bit confused as to what should be entered in to the noOfFrames variable...

[mariem khrissi]

does noofframes correspond to the number of frames ??

[Manuel Brandner]

noofframes equals signalblocks. in matlab you can use buffer to chop the signal into blocks with or without a certain overlap. Each signal block is then used in the HNR code to calculate the autocorrelation. After that the first zero crossing of the normalized autocorrelation is searched for. The maximum peak value is searched for with the max function and the sample position is then used (in the best case this gives you also the underlying fundamental frequency = fs/samplepos).

the energy at this position compared to the overall energy (value of the autocorrelation at index = 1) gives you the harmonic to noise ratio.

or for the normalized autocorrelation:

drawbacks as far as I understand it are:

• pitch dependency
• accuracy decreases if the signal gets more complex (in speech for example formants)
• SNR has an influence on the values in terms of comparison of several measurement situations

Answer 3

[Li feng]

what is noOfFrames？

[KALYAN ACHARJYA]

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