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I have to do a project where I'm receiving the same sound signal from different channels (with different offsets), but they may not be consistent all the time. At any given time, I should decide which channel is providing the best transmission, and make the connection as persistent as possible.

I'm an electronic engineering student familiar related concepts. I appreciate it if you know of any reference that would help me.

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    $\begingroup$ Is it speech signals? Most common quality metric for speech would be PESQ or some derivative. Not sure if it's applicable in your scenario. $\endgroup$ – Florian Jul 24 at 7:25
  • $\begingroup$ Yeah it is! Thanks, I would check it out. $\endgroup$ – Kamyab Jul 24 at 7:50
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From your comment I take it you are looking for speech quality measures. As far as I know, there exist a couple of objective measures, along with subjective procedures, since quality of speech is kind of a vague concept which may not be the same to everyone.

Since your application seems to require automatic evaluation, there are a number of measures you might want to check out:

  • ITU-T Rec. P 835 for assessment of listening speech quality (no available reference signal)
  • The PESQ for listening speech quality, mentioned by Florian already (when the reference signal is available)
  • The PEAQ for assessment of audio quality (when the reference signal is available)
  • The E-model für conversational speech quality (network parameters available)

All of these are listed in this book, along with a range of subjective measures. It seems to me that for your application, the ITU-standard is most reasonable since no clean reference signal is required.

Edit: What also may be of interest of you is the frequency-weighted segmental SNR (fwsegSNR), which incorporates the articulation index (AI). This measure apparently correlates well with subjective measures.

An overview of objective speech quality measures is also given in this Loizou paper available online.

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