"Impulse Response" for audio amplifier?

[lumanauw]

There is a method to know the characteristic of room accoustic using what is called "Impulse Response". With this method, using only few (like 3, very short impulse) signal, we know all the characteristic (EQ setting needed, Clarity, time delay needed, how much reflection, etc, etc...) for that room. Don't even need RTA measurement or measuring distances for time delay

Some are selling software for this, like www.YMEC.com

Interesting part is in here.
http://www.earlevel.com/Digital%20Audio/Reverb.html
It contains this "The impulse response tells everything about the room."

I think this kind of measurement is suitable for audio power amplifier. Is there anything like "Impulse Response" for audio power amp, for knowing every behavior of the amp hopely can "predict" how it will sound?

This is interesting, because this kind of measurement doesn't include steady signal. It measures very short impulses, and how it reacts to it.

Something like Mr.Graham Maynard's "First Cycle"?

[bogicp]

Originally posted by lumanauw
There is a method to know the characteristic of room accoustic using what is called "Impulse Response". With this method, using only few (like 3, very short impulse) signal, we know all the characteristic (EQ setting needed, Clarity, time delay needed, how much reflection, etc, etc...) for that room. Don't even need RTA measurement or measuring distances for time delay

Some are selling software for this, like www.YMEC.com

Interesting part is in here.
http://www.earlevel.com/Digital%20Audio/Reverb.html
It contains this "The impulse response tells everything about the room."

I think this kind of measurement is suitable for audio power amplifier. Is there anything like "Impulse Response" for audio power amp, for knowing every behavior of the amp hopely can "predict" how it will sound?

I agree, but probably not "well suitable", because there is need for a little more power for testing amplifiers, if we need to "predict" with measurements "how it will sound".

This is interesting, because this kind of measurement doesn't include steady signal. It measures very short impulses, and how it reacts to it.

Something like Mr.Graham Maynard's "First Cycle"?

Please look at some papers about shaped tone burst... this test method is more closer to real purpose of audio amplifiers.

You can find some references at our site:
http://www.bozoel.com/products/bozotest/references.html

and some (free) test signals at
http://www.bozoel.com/products/bozotest/download.html

Use only your ears, and you can find a bunch of anomalies....
if you use loudspeakers also...
If you play test tones and record it from amplifier output, you can find also more informations with simple sound editor, like cool edit pro... etc.



Best regards,

-boggy

[PMA]

David,

in case you know impulse response, you can calculate amplitude response and phase response for linear system (by means of Fourier Transform of the impulse response you get Transfer Function in Frequency Domain). This is one of the basics of the Signal Theory.

Regards,
Pavel

[SY]

boggy, excellent stuff on your site!

[PMA]

You're right Stuart, let's go wavelet transform ....

Anybody knows effective way?

[lumanauw]

Hi, PMA,

I just know this "Impulse Response for Room Accoustic", I don't know much about this.

But from the idea behind it, we should know how much TIM or how much intermodulation within an audio power amp just using this kind of "Impulse Response" test. I think these factors can determine how an amp will sound (compared to THD or S/Nratio or Damping Factor).

http://www.diyaudio.com/forums/showt...332#post712332

[PMA]

David,

the impulse response does not discover nonlinearities.

Pavel

[lumanauw]

Maybe not, I don't know

But I've got a feeling, if there is a test like this for audio power amps, your design(s) should be excellent of the result

[PMA]

David,

the impulse response is one of the very efficient methods to analyze circuits. Just one of the complete set of measurements. I had been often using it since my studies in the seventies in the last century.

[lumanauw]

Hi, PMA,

the impulse response is one of the very efficient methods to analyze circuits. Just one of the complete set of measurements.

Hey, you said it yourself Although it is from "last century", I think you understand why I wrote this thread