ISP Analyzer - When true peak scan cannot represent what happens in a real DAC

[danadam]

I am pretty sure we can come up with some ideal test signal of ISP that can be used in a listening test, which would sound like 'clicks' or 'grainy noise'.

Here's one with tones:

Invitation: Audible intersample clipping test

The test signal is attached at the end of this post: https://forum.cockos.com/showthread.php?t=201868 Basically I don't like the idea of blaming those who make music or DACs for intersample clipping since there is no absolute clipping point. My test signal is a bit more sophisticated than the...

www.audiosciencereview.com

Note, there were some concerns about possibility of equipment damage:

Can you really hear the sound details over 20kHz?

WARNING - PLAY THE ATTACHED FILE ON HEADPHONES ONLY. HIGH LEVEL PLAYBACK MAY DAMAGE TWEETERS. Hello, are you a moderator in Hydorgenaudio? I suppose moderators in HA should have high degree of audio knowledge so my question here: https://hydrogenaud.io/index.php?topic=114816.msg946524#msg946524...

www.audiosciencereview.com

 

[OHtaru]

Note, there were some concerns about possibility of equipment damage

I know that, so I didn't play longer.

Here's one with tones

Wow, this is obvious!!!!!

 

[morillon]

It would be great to get a rough idea, thanks to your approach, of the additional headroom to allow with the most common filters supplied with AKM or ESS DACs.... What about the additional headroom that also seems necessary when using digital compression? Should all these margins be combined as a precaution? ;-)

 

[OHtaru]

It would be great to get a rough idea, thanks to your approach, of the additional headroom to allow with the most common filters supplied with AKM or ESS DACs.... What about the additional headroom that also seems necessary when using digital compression? Should all these margins be combined as a precaution? ;-)

What does "digital compression" mean? Dynamic range compressor or lossy compression like mp3 and AAC？

 

[morillon]

MP3 AAC etc

 

[OHtaru]

MP3 AAC etc

This also requires headroom, and it's more about player software than your DAC. Lossy formats should be decoded to float32. It is recommended that you use Foobar2000, which has no problems at all in this regard. It can not only correctly decode samples greater than 0dBFS, but also output samples greater than 0dBFS, which are handed over to the Windows mixer for final attenuation.