You need software that can do the resampling/decimation along with the FIR convolution on multiple channels and then output to a multichannel DAC. A PC with the right software should be able to do this easily. Acourate, Bodzio UE, Audio Weaver, etc are commercial products that can do this. Does anyone know of similar freeware?
A standalone piece of hardware would need to have this capability programmed into it's firmware (what we have been waiting for in vain from NAJDA)
Hardware or software but the principal is reducing the sample rate on the channels that carry only low frequency information. The filter needs to be created at that sample rate but it needs more than just a low sample rate filter.
It doesn't make sense in a computer based system unless you are looking to use more than eight channels of very long FIR filters, probably why it isn't very popular. Using minimum phase to do the heavy lifting and then shorter FIR filters to undue the phase wrap uses much less resources.
Yes this seems like the most efficient way to allocate processing power, but if a particular DSP/DAC unit won't allow IIR+FIR filters (and decimation) then you need a computer upstream anyway to perform the convolution. Why not just do it all at the PC and use a multichannel soundcard? I have not seen (for a reasonable price) a product that can handle IIR+FIR for a linear phase 4-way system.
For stereo music chaining two hardware devices together can be a solution, using something like one of the Minidsp sharc boxes or kits on the input to do the phase processing outputting to another box to do the IIR crossover etc. Using a smaller number of taps for phase correction only would result in lower latency which might be important for some.
If there is any kind of reasonable computer available as the player then it makes sense to use that to do all the processing. The only reasons not to is because you don't want to use a computer or you need low latency.
If there is any kind of reasonable computer available as the player then it makes sense to use that to do all the processing. The only reasons not to is because you don't want to use a computer or you need low latency.
Just as an aside, I'm a Mac user, and I'm wondering whether there's any standalone software convolver or DSP engine that can import FIR filters and output the processed (two channel) audio to the operating system – freeing me up to use any music player upstream of the processor that I want. (I don't want to use iTunes or any of the bloated players that host audio plug-ins and rely on loading from the iTunes library.)
I know I could use Dirac (and I'm pretty tempted to be honest) but I was wondering whether there's anything more universal that allows the import of user designed FIR filters.
I know I could use Dirac (and I'm pretty tempted to be honest) but I was wondering whether there's anything more universal that allows the import of user designed FIR filters.
You can use AU Lab to host plugins and Soundflower to redirect the audio stream from whichever player you choose.
This is a free AU convolver
Lernvall Audio
Or you could use a VST convolver in a wrapper
There were a couple of things that made me scratch my head but I have the same setup running on my Macbook to allow me to feed EQ into the output from REW when measuring speakers.
There are always the fancier Mac programs like Pure Music or Sonic Studio but they seem expensive to me.
Jriver has a Mac version too and that has built in DSP and convolution.
Jriver is the best player I have found for music so far but if you need any help getting AU lab and Soundflower working let me know.
This is a free AU convolver
Lernvall Audio
Or you could use a VST convolver in a wrapper
There were a couple of things that made me scratch my head but I have the same setup running on my Macbook to allow me to feed EQ into the output from REW when measuring speakers.
There are always the fancier Mac programs like Pure Music or Sonic Studio but they seem expensive to me.
Jriver has a Mac version too and that has built in DSP and convolution.
Jriver is the best player I have found for music so far but if you need any help getting AU lab and Soundflower working let me know.
The most elegant solution is to use a player with built in DSP engine.
Jriver does that well for me. Pure Music has the same.
AU lab is minimal but you can load and chain whatever plugins you want. What more do you want it to do?
No need for itunes unless you want that to be the player. I don't know of any player that would force you to use the itunes library if you didn't want to.
Player>Soundflower>AULab
Soundflower sits in the background and is just like selecting another soundcard in the player and plugin host.
PS: Dirac is not that flexible in that you can't change anything other than the target response.
Jriver does that well for me. Pure Music has the same.
AU lab is minimal but you can load and chain whatever plugins you want. What more do you want it to do?
No need for itunes unless you want that to be the player. I don't know of any player that would force you to use the itunes library if you didn't want to.
Player>Soundflower>AULab
Soundflower sits in the background and is just like selecting another soundcard in the player and plugin host.
PS: Dirac is not that flexible in that you can't change anything other than the target response.
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I find the best solution to that is to use an app to control playback and library functions. There are a couple for Jriver that I quite like, JRemote and EOS. I also like the Apple remote app and have used that to control Foobar on windows.
The apps look better and are easier to use to me anyway.
The apps look better and are easier to use to me anyway.
Biquads
Hi all
i am trying to import biquads from REW to Najda. I have used a generic eq in REW and have checked 96kHz as sampling frequency.
This is my exported file:
If i try to import i get an Error: invalid File ;(
Greetings
Christian
Hi all
i am trying to import biquads from REW to Najda. I have used a generic eq in REW and have checked 96kHz as sampling frequency.
This is my exported file:
Code:
biquad1,
b0=1.0,
b1=0.0,
b2=0.0,
a1=0.0,
a2=0.0,
biquad2,
b0=0.9990533854262882,
b1=-1.9965312502634536,
b2=0.9975250114537477,
a1=1.9965312502634536,
a2=-0.9965783968800359If i try to import i get an Error: invalid File ;(
Greetings
Christian
Did you find your answer? It is addressed on page 14 of the manual here: https://web.archive.org/web/20160315195113/http://waf-audio.com/doc/Najda/Najda_Under_Control_Manual.pdf
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