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LeonardJayawardena-3494 asked LeonardJayawardena-3494 answered

24k. .wav. vs. 48k, .wav

I use Azure Speech Studio to generate audio files for use on YouTube videos. When exporting, is there a difference in audio quality between 24k, .wav and 48k, .wav?
I notice that the default setting is 24k, .wav.
Thanks.

azure-speech
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romungi-MSFT answered romungi-MSFT commented

The audio quality on 48k will be higher. This is basically a difference in the bitrate and encoding type, so exporting a higher quality audio will definitely help in the quality of the videos. The supported audio formats are also listed here. You can use tools like audacity to check the difference of quality in these formats.


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Thanks, from now on I will be using 48k, though, I must confess, to my ear there isn't a discernible difference in audio quality. I installed Audacity, but how do you use it to check any difference in audio quality?

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romungi-MSFT avatar image romungi-MSFT LeonardJayawardena-3494 ·

@LeonardJayawardena-3494 Yes, the differences are very subtle for a normal user. To spot the difference in quality using any tool tests need to be run. Because, this is a difference in the bitrate you can refer this thread from sound exchange that describes these test. If you are fine with the quality of the exported files though then you can continue to use 48k.


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LeonardJayawardena-3494 answered

One further question. Just over and to the right of the text box of Speech Studio there is an option to select the "sample rate" from 8 kHz to 48 kHz. Should this also be set to 48 kHz? When I do that, I find that the audio file generated comes out with the file name extension "mp3," instead of .wav. What does this mean?

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LeonardJayawardena-3494 answered

Further to my earlier post, I now see that the files are generated with the extension .wav in all cases. I don't know why that earlier anomaly took place.

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