Home Theater Shack Forums
Home About Us Rules Register Gallery Glossary FAQ
Creative Sound Solutions: Loudspeaker kits and components for subwoofers, midwoofers, woofers and full range speakers! Reliable Hardware: A Reliable Source for Case, Cabinet and Acoustical Hardware! Epik Subwoofers manufactures world-leading high performance subwoofers for die-hard home theater and music enthusiasts who won't settle for anything less than the best. Parts Express: Excellent Source for DIY Speaker and Subwoofer Projects! RAM Electronics: Audio, Video, Home Theater and Computer Cables. PacParts: Replacement parts & accessories from the most recognized manufacturers in the Consumer Electronics Industry! Discount Merchant:  If you need a replacement bulb for your video device... look no further... save big! Emotiva is your Home Theater Component Source for Audiophile Quality Home Theater Equipment at Factory Direct Prices Fi Audio: Infinitely amazing balanced high end musicality designed drivers! Ultimate Home Entertainment: Providing home theater seating and accessories such as popcorn machines and signage... at very affordable prices! Visual Apex: The most competitive pricing for home theater projectors... and built on customer satisfaction! BOCS - Power Up Your Tivo! Elite Screens offers the finest in affordable projection screens. SVSound GIK Acoustics: Home audio acoustics at its best... especially when you have help from the owners right here at the Shack!  Check out their very affordable acoustic panels!
Go Back   Home Theater Forum and Systems - HomeTheaterShack.com > Equalization | Calibration > SPL Meters | Mic's | Calibration | Sound Cards
Forgot Password?

SPL Meters | Mic's | Calibration | Sound Cards

  Discuss Delay when processing FIR filters? in the Equalization | Calibration forum; Delay when processing FIR filters? Hi Guys (and girls?) The last couple of weeks I have been messing around with different kind of software for ...



 Reply     Post New Thread
Views: 402 - Replies: 2  
Thread Tools
Old 09-05-09, 02:27 PM   #1
Shackster
Alias: Theealge
User: #20826
Since: May 2008
Posts: 7
  Theeagle is offline  
Delay when processing FIR filters?


Hi Guys (and girls?)
The last couple of weeks I have been messing around with different kind of software for digital room correction/EQ. After quite a few measurings etc. I've got a descent FIR filter I would like to use. So far I have been using it with foobar and convolver, and it works just perfect

My problem is, that I would like to use the FIR-filter with a VST-host, by doing so I should be able to run all sounds through the FIR filter. Unfortunately I'm experiencing quite a high delay when using convolver with a VST-host

So far my configuration is as following:
EMU 0404 soundcard -> all sound is being sent to ASIO in
Console (VST-host) -> picks up the ASIO-in signal
Convolver - processes the FIR filter (131072 taps stereo filter in 44100 hz)
Console -> forward the sound to the ouput

From this link I found the following information concerning the delay associated with the use of FIR-filters:
(links removed due to restrictions)
given a FIR filter which has N taps, the delay is: (N - 1) / (2 * Fs), where Fs is the sampling frequency

If this information is correct, the 1.5 s delay is just a result of my pretty huge FIR filter. I just wonder, cause in foobar with convolver I haven't noticed this delay at all, and I felt pretty sure that it should be possible to process a FIR filter in (near)real-time.. But I might be wrong?

Anyone who can confirm if a fir filter can be processed in real-time or not? And perhaps know a solution

Thanks a lot!

(I hope I have placed the topic in the right category)



Last edited by Theeagle; 09-06-09 at 07:23 AM..

Forum Rules Reply With Quote
Alt Advertisement
Old 09-06-09, 09:06 AM   #2
Elite Shackster
Platinum Supporter
Alias: brucek
User: #6
Since: Apr 2006
Posts: 7,306
  brucek is offline  
Re: Delay when processing FIR filters?


Quote:
I hope I have placed the topic in the right category
There really isn't a category for this question, but I would suggest re-asking the same question in the Convolver thread. You may get better play there.

brucek


Forum Rules Reply With Quote
Old 09-06-09, 09:27 AM   #3
Shackster
Alias: Theealge
User: #20826
Since: May 2008
Posts: 7
  Theeagle is offline  
Re: Delay when processing FIR filters?


Thanks a lot Brucek
I have made a post in the convolver thread and hope that someone is able to help me out.



Forum Rules Reply With Quote
 Reply     Post New Thread     Post New Thread



« Home Theater Shack > Equalization | Calibration > SPL Meters | Mic's | Calibration | Sound Cards »

« Previous Thread   Next Thread »

Bookmarks

Tags
delay, filters?, processing
Thread Tools

Posting Rules
You may not post new threads... You may not post replies... You may not post attachments... You may not edit your posts

BB code is On... Smilies are On... [IMG] code is On... HTML is not allowed!



Bookmark and Share


Parts Express: The #1 Internet source for all your DIY and electronics needs!

Ultimate Home Entertainment    

This site is best viewed with a screen resolution width of 1280 or higher!




Powered by vBulletin
Copyright ©2000 - 2010, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2010, Home Theater Shack, LLC.
John Mulcahy and Sonnie Parker - ALL RIGHTS RESERVED!



Massage Chairs   Wall Fountains   Bath Vanities   Electric Fireplaces   Bunk Beds

Dish Network



Sponsor/Vendor Ad Rates

Search Engine Friendly URLs by vBSEO 3.3.0