Frequency transformation supported by EQ?

[maddib]

Hi,

I'm rather new to REW EQ, but I already could achieve some major goals when using it.
So, when it comes to EQing a measurement to a specific target curve it ends in some EQ parameters in up to 20 frequency slots. I'd like to know if REW EQ, besides this rather classical EQing, also supports some sort of frequency transformation/adjustment, i.e. sending a specific frequency, measuring it, comparing it to the one sent, and making adjustments to the frequency itself, not only to its loudness. May be it's always done in the background without telling the user.
Sorry, for this newbie question

thanks

 

[ddude003]

In REW try Help EQ, Help Generator & Help RTA... If that does not get you what your looking for... Try the Trace Arithmetic, A.k.a. Vector math...

 

[pklose]

I understand your request and would like to have it, too. To help, you could use MSO from https://www.andyc.diy-audio-engineering.org/mso/html/index.html OR you can use manual bands in the EQ app of REW. Results will rendered. But null points cannot be found this way.

 

[maddib]

I read quite a lot, and sure, there may be something I missed. REW is esp. able to measure frequencies with their amplitude rendered by speakers. And the original signals are often sent by some data generated by REW. So, after or while sending these signals to a speaker and measuring the rendered output... does REW somehow detects differences between original and rendered frequencies? Let's say would REW see if an original frequency of e.g. 5,000Hz is rendered as 4,965Hz?
And if REW was able to detect that, would it be able to correct that?
May be I'm totally on the wrong path. But somehow I can't find an answer for this question

 

[ddude003]

Maybe read the https://www.avnirvana.com/resources/getting-started-with-rew-a-step-by-step-guide.19/ on the REW download page...

 

[John Mulcahy]

Linear systems do not change the frequency of signals passing through them.

 

[maddib]

Thanks for your link, but the very few appearances of the words frequencies or frequency don't reveal an answer.

 

[maddib]

Linear systems do not change the frequency of signals passing through them.

Okay, so whatever frequency is sent to a speaker it will render the (nearly) exact same frequency...?

 

[sm52]

maddib
you confused yourself. If REW says it sends 10 Hertz, then it sends 10 Hertz and the sound card, amplifier and speaker will play 10 Hertz. Everything else is from the evil one.

 

[maddib]

maddib
you confused yourself. If REW says it sends 10 Hertz, then it sends 10 Hertz and the sound card, amplifier and speaker will play 10 Hertz. Everything else is from the evil one.

Well, I'm not a physicist . But in each speaker there's moving mechanics, at the very end. And they behave 100% as theory? May be the real deviations are that small that they are actually inaudible?

 

[ddude003]

In a perfect world REW sends a tone or sweep (range of tones), your system plays those tones and REW records/samples what was played using a microphone... Then you can display what REW records and see how close or how far from perfect your system and room is... You can then use REW to create various EQ filters that you can load into your systems signal chain to "correct" the imperfections... Your signal chain must have a device or software that can use the EQ filters that REW produces...

In theory there is no difference between theory and practice. In practice there is. -Yogi Berra-

 

[skid00]

Distortion defines the difference between what is sent, and what is reproduced.

Speaker drivers will produce the same freq they are sent (possibly at a much lower loudness), but may also resonate with harmonic distortions that are multiples of the signal.