Estimating amplifier transfer function...? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 24th April 2007, 10:45 PM   #1
Limhes is offline Limhes  Orkney Islands
diyAudio Member
 
Join Date: Apr 2005
Location: Nijmegen!
Default Estimating amplifier transfer function...?

Right now I am in the middle of an EE subject called Adaptive Systems, employing some algorithms to obtain a valid (usable) model of 'any' (linear) system. For example, one puts a 'persistently exciting' input (enough frequency/amplitude content) into a system and measures its output, trying to estimate the transfer function from it, in terms of bode diagrams, impulse response, pole/zero diagram or whatever.

Has anyone ever tried this to get to a good quality measure of his (her) amp, regarding stability/resonance character? To me, it seemed very valuable and worth a try. But, since it needs some (high quality) equipment, I would like to hear some thoughts on this first...

Shoot!

Link to my course reader: http://www.limhes.net/upload/AS1_05.pdf
  Reply With Quote
Old 24th April 2007, 10:59 PM   #2
diyAudio Member
 
darkfenriz's Avatar
 
Join Date: Jun 2004
Location: Warsaw
Square wave response gives you most answers what frequency/phase response is. Common, simple and infinite bandwidth in theory.
  Reply With Quote
Old 25th April 2007, 10:45 AM   #3
Limhes is offline Limhes  Orkney Islands
diyAudio Member
 
Join Date: Apr 2005
Location: Nijmegen!
The problem with this is, that you want to see the response to all frequencies on just a small time period. You think all useful information is in peaking/ringing of a square wave?
  Reply With Quote
Old 26th April 2007, 05:17 AM   #4
diyAudio Member
 
Join Date: Feb 2006
Location: Portland, OR
Truth is I think most of the interest isn't in the linear transfer function. Per you comment on a square wave excitation, which does tell lots, but not for example loop stability per say ( a conditionally stable loop can have excellent transient response, but that's an exception.)

Much is to be learned about the "linear"system in how it responds to say multitone, and what new tones it produces.

If one could actually make a meter that could tell how good an amp would be percieved, then you'd really be on to something.
To date, some amps with rather poor THD actually sound better to the masses then ones with far better THD. Make a meter for that and write a paper.

mike
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
transfer function jenks Solid State 31 24th April 2008 08:28 PM
Question about transfer function magnitude. massappeal129 Subwoofers 4 16th August 2007 10:21 PM
Transfer Function jclouse Multi-Way 22 1st July 2006 01:19 PM
Transfer function of closed box cm961 Multi-Way 1 31st August 2004 06:42 PM
Electrical transfer function measurement Thomas B Multi-Way 4 12th March 2003 04:04 AM


New To Site? Need Help?

All times are GMT. The time now is 05:24 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2