Harmonic to noise ratio calculation
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How can i calculate the harmonic to noise ratio of a signal?
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KALYAN ACHARJYA
le 28 Juin 2019
Modifié(e) : KALYAN ACHARJYA
le 16 Nov 2019
To understand in detail theory, read here
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Manuel Brandner
le 19 Déc 2020
Modifié(e) : Manuel Brandner
le 19 Déc 2020
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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/465775/image.png)
or for the normalized autocorrelation:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/465780/image.png)
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
Li feng
le 16 Nov 2019
what is noOfFrames?
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KALYAN ACHARJYA
le 16 Nov 2019
Please write the comment in comment section only (Just below the answer).
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