How does a phase rotator work?

[cordura21]

I can't understand this one, as well as what an all-pass filter is.
Thanks for the help. Andrés

 

[Son of Mixerman]

For Radar or Radio Processing?

SoMm

 

[cordura21]

the things they used on radios to process the signals.

 

[bleyrad]

i'm also curious. especially about the all-pass filter. apparently there are several different techniques for samplerate conversion, and using an all-pass filter is the best (simply dropping samples at a set interval after a FIR filter is the worst way.)

however, the only program/plugin i've seen that uses an all-pass filter in the conversion process is for Linux.

 

[Son of Mixerman]

the things they used on radios to process the signals.

Cool, this is a link that covers alot of ground of PR for audio. It was orininally developed for Airborne Radar.

http://www.euphonicmasters.com/orban_article.html

SoMm

 

[cordura21]

thanks for the link. I already read it, in fact that's where I learned of the existence of such a device. But from what's written, I couldn't understand how it works, or how an all-pass filter does its job.
Cheers, Andrés

 

[DigitMus]

The Littlelabs IBP (in Between Phase) box uses an all-pass filter to achieve a certain degree of phase matching between multiple mics or mic vs. direct. If you look at the Guest Moderator Archives at www.gearslutz.com Jonathan Little was moderator there for a month. Should be a wealth of information.

Scott