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DSP Overshoot vs. Intersample peaks and True Peak limiting - the devilish details !

October 20th, 2023 BY 

Hands up - I could have done better !

If you saw either of my two videos about inter-sample peaks and True Peak limiters, there's a chance you might have ended up being confused.

This was called out during some interesting conversations over on the Mastering Forum on GearSpace, where several members pointed out that I'd glossed over some important details in those videos - and, I agreed with them.

Specifically, in both videos I used the terms "ISP" or "inter-sample peak" to refer to two different types of peak level, without explaining the difference. They're closely related, but there are some important and interesting differences.

I'm not the only one - many other people also use the terms loosely, but it can lead to some incorrect conclusions, so in this video I've tried to set the record straight, diving into the details and exploring the topic in more depth. Some of the topics include:

  • The difference between inter-sample peaks and DSP overshoot, and
  • Why it matters
  • Why different meters sometimes give different True Peak readings
  • What over-sampling has to do with it all
  • The best way to test the "sound" of a True Peak limiter, and
  • When a True Peak limiter may not do what you were expecting

Hopefully you'll find it interesting - one of the people I was talking to on GearSpace was Alexey Lukin, the principal DSP developer from iZotope, who really knows his stuff ! As a result I ended up talking to him on my podcast about all this, and you can hear my interview with him here.

ABOUT IAN SHEPHERD

My name is Ian Shepherd - I'm a professional mastering engineer with over 25 years experience and I run the Production Advice website with over 50,000 readers each month

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