More > JRiver Media Center 18 for Windows

Limiter DSP for LFE channel

<< < (2/5) > >>

mojave:

--- Quote from: Matt on January 26, 2011, 01:19:51 pm ---In response to the topic, I think it's a great idea.  I also think you're a year or two ahead of us.

For v16, my signal processing goals are a nice analyzer and a parametric equalizer.

--- End quote ---
It looks like you are catching up!  ;D

Matt:
This is funny.

I told you that you were a year or two ahead of me!

mojave:

--- Quote from: 18.0.40 ---5. NEW: Added 'Subwoofer' mode to Parametric Equalizer > Limiter (an adaptive limiter well suited for subwoofer use, good after a Linkwitz, etc.).
--- End quote ---

This looks like a great addition. Can you explain what the subwoofer mode does?

Recently I was experimenting with limiting by splitting the subwoofer into User1 (above 20 Hz) and User2 (below 20 Hz) and applying limiting to User1 User2. Then I would combine them back again and route to Subwoofer. This worked well and the signal would stay the same until high output and then just below 20 Hz would be limited.

Matt:
Because of the Linkwitz in my home system, I sometimes get distortion on the subwoofer if the volume is high.  This is because at close to full volume, there's no extra headroom from Internal Volume.

This new limiter is just an easy way to add an adaptive limiter that works well for a subwoofer.  I wrote the adaptive limiter, and still think understanding the parameters is a little tough.

The subwoofer limiter hard-clamps at full volume, only holds a little, and recovers lost volume quickly.  This way, a huge bass hit that exceeds the limit will still sound reasonably good (just not as loud), but the next bass hit a couple seconds later that's not quite as loud will be reproduced as intended.

In initial testing, it works well.  I should know even more after living with it a few months and watching a variety of movies.

mojave:
I was backwards in what I stated I was limiting in my previous post. I have fixed it.

I currently have 3 different DIY subs and 4 different amps I could use with them. Depending on sub/amp combination, the limit can be reached much sooner than full volume. Maybe you should allow for a user selectable dB setting. I can currently do this manually by increasing user2 by 5 or 10 dB, applying the limiter, decreasing user2 by the same dB amount, and then adding user2 and user1 back to subwoofer. By increasing the volume, I'm forcing to limiter to act when I want it to and by splitting the frequencies I'm allowing the limiter to only affect the bass below a certain frequency. I can see both of these being beneficial to you.

Navigation

[0] Message Index

[#] Next page

[*] Previous page