Resampling artifacts

[T3RIAD]

Is there a test file that is specifically designed to reveal resampling artifacts? I want to know if my Android phone resampling from 44.1 kHz to 48 kHz is added any distortion or not.

 

[AnalogSteph]

There is. Here's a blast from the past, straight from my downloads of the year 2004. Well, I FLAC'd it.

Found an improved version as well - also attached for good measure.

The forum won't accept any audio files as attachments, so I zipped them.

 

[Veri]

There is. Here's a blast from the past, straight from my downloads of the year 2004. Well, I FLAC'd it.

Found an improved version as well - also attached for good measure.

The forum won't accept any audio files as attachments, so I zipped them.

Intriguing. Any instructions on what to do with this?

 

[danadam]

The file contains DTMF tones (I assume) at low volume level (in other words they are telephone buttons' tones). In addition, the second half of the file has a loud high frequency tone (around 20 kHz). If you play the file and it is processed by a poor resampler then you'll hear some distortions during that second half. Because of that loud high frequency tone I'd suggest playing it first at low volume and then increasing it a bit on following replays.

The original topic on HA: https://hydrogenaud.io/index.php?topic=9772.0

 

[pozz]

It's better to use a single-tone sweep going up to 30kHz or higher. Track the ascending tone and, if it reverses course, you have issues. Another option is recording and then throwing the file into a spectrum analyzer in a DAW.

Unrelated, if you use an ascending two-tone sweep you can listen for IMD components.

Much less risk of blowing tweeters and so on.