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-   -   Phase EQ using FIR filters (http://www.diyaudio.com/forums/multi-way/12950-phase-eq-using-fir-filters.html)

Grasso 26th March 2003 06:23 PM

Phase EQ using FIR filters
 
HI,

has anyone some experience in this? I have a real-time DSP platform ready to work with ( http://grassomusic.de/english/m56k.htm ), but I still miss rudimentary FIR coefficient types. How does a phase EQ look like?

Then there is the question if an über-alles EQ is sufficient. In case of horn speakers, delays are big, hence seperate delay lines and EQs must be used.

This is not solely about an optimized phase at 0° angle but also for acceptable amplitude and phase characteristics at different radiation angles. A speaker which can produce 110dB SPL at any frequency and at a radiation of +-40° hor. and +-20° ver. cannot have a perfectly flat phase but must find a balance.

DSPs are a powerful and dangerous tool, which if justly used can enhance sound quality. Any comments welcome.

phase_accurate 26th March 2003 07:30 PM

If you want to time-align horns, then a constant (i.e. frequency independant) delay would be a good start.

Regards

Charles

Grasso_new 2nd July 2003 10:37 PM

The results
 
Hi all,

see http://grassomusic.de/e/phaseeq.htm for my findings.

Uli


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