Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Using DSP to emulate analog crossover?
Using DSP to emulate analog crossover?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th December 2018, 07:59 PM   #1
preiter is offline preiter  United States
diyAudio Member
 
preiter's Avatar
 
Join Date: May 2006
Default Using DSP to emulate analog crossover?

I'm looking to design my first analog crossover.

I'd like to emulate an analog design using a DSP crossover so that I can evaluate different designs without building them.

Is there a guide somewhere on how to do this?

How close will the response of the DSP be to the equivalent analog circuit?

I have a miniDSP, a beocreate and a DCX2496 so a tutorial using any of those platforms would be ideal.
  Reply With Quote
Old 6th December 2018, 02:29 PM   #2
zbig001 is offline zbig001  Poland
diyAudio Member
 
zbig001's Avatar
 
Join Date: Nov 2018
Some attributes of analogue crossovers seem not reproducible in DSP, or very tedious and impractical to reproduce.

But general character of the sound from chosen crossover frequency could be reproducible.
Especially speakers directivity matching problem, audibility of sound reflections in the listening room.
Or speaker's susceptibility to overdive problem.
  Reply With Quote
Old 6th December 2018, 03:39 PM   #3
NikolaG is offline NikolaG
diyAudio Member
 
Join Date: Dec 2016
IIR DSP x-over is the closest you get to an analog filter response - it is going to have the same frequency response and phase-shift.
  Reply With Quote
Old 6th December 2018, 05:04 PM   #4
CharlieLaub is offline CharlieLaub  United States
diyAudio Member
 
Join Date: Mar 2007
Location: Michigan
Quote:
Originally Posted by zbig001 View Post
Some attributes of analogue crossovers seem not reproducible in DSP, or very tedious and impractical to reproduce.
Huh? Like what, exactly?

The only thing that an IIR DSP filter cannot reproduce AFAIK are the faults of the actual circuitry used to implement analog active filters. A DSP filter can much more accurately and reproducibly hit the target response of any desired "analog" filter. On the other hand, when you build an actual circuit from real world components with real tolerance errors in their values, what you get can be close but not exactly what you designed in terms of corner frequency and Q, and sometimes it's not really all that close...

At one time I designed a set of versatile PCBs for implementing a wide variety of analog filters for crossover work. Then I thought "why don't I use a DSP (miniDSP at the time) to tune the crossover to what I want, and then I can implement it with my active circuit PCBs"??? As soon as I found out how easy it was to use DSP, I never went back!

DSPs have their own set of challenges and some (early ones) did not have sufficient output voltage and were a bit noisy. But this seems to be getting better and there are even options like DSP processing on a mini-computer with an outboard AD/DAC unit.
__________________
Visit my Audio Web Page <<--CLICK TO LEARN MORE-->> Get my LADSPA plugins
  Reply With Quote
Old 6th December 2018, 06:37 PM   #5
zbig001 is offline zbig001  Poland
diyAudio Member
 
zbig001's Avatar
 
Join Date: Nov 2018
I have read the first post exactly as a question whether you can just recreate the complicated game of the relationship between the current and the voltage throughout the amplifier-crossover-speaker system.

And I think it would have been difficult to get the same result...
For example, you would have to take into account speaker impedance curve.
And there is also the issue of amplifier's output impedance seen by the loudspeaker.
Passive crossovers can greatly reduce amplifier's damping factor, especially near the crossover point.

Or, if the signal passes through a reactance element and a resistor connected in parallel, we would obtain something like two tracks mixed with phase shift. And various effects resulting from it.

In DSP we have only as many signal paths as there will be ways in the crossover...
And all the advantages of electrical isolation between crossover ways.
  Reply With Quote

Reply


Using DSP to emulate analog crossover?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
LX mini analog crossover Dennis Hui The diyAudio Store 4 20th September 2018 07:33 AM
Analog Crossover for LX-mini Nelson Pass Multi-Way 1 7th July 2018 10:51 PM
Do i need analog active Crossover or Digital Crossover for DIY home theatre speakers? dipankar862 Multi-Way 43 16th March 2017 06:55 AM
Can you use a digital active crossover to design a passive analog crossover ? RickDangerous Digital Line Level 27 1st April 2013 06:59 AM
Possible to emulate a sloped baffle? Mal P Multi-Way 11 8th April 2005 01:18 AM


New To Site? Need Help?

All times are GMT. The time now is 12:25 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki