Just out of curiosity, does anybody know what the difference is between a graphic equalizer and a parametric equalizer? Because, while searching the internet I have seen both titles used but I havent known what the difference is.
- Paranoid_Android asked 15 years ago
There are actually three types of equalizers as it goes with professional audio equipment: graphic, parametric, and dynamic.
Graphic equalizers generally come in 15 or 31 band units. The audio spectrum is divided up into 15/31 “bands” from 20Hz to 20000Hz. However, the frequencies are not divided evenly – it generally goes something like 20, 45, 80, 100, 160, 250, 400, 630, 1000, 1600, 2500, 4000, 6300, 10000, 16000 (at least for 15 bands). The frequencies are all fixed, so you can only adjust the amount of gain that each frequency gets.
Parametric equalizers generally come in 5, and sometimes 21 band units. Each band is completely adjustable (hence “parametric”) – you can choose the fequency that is modified, the gain for that frequency, and often the width of the adjustment (i.e. how much should it adjust the adjacent frequencies).
Dynamic equalizers are a poorly defined type of equalizer. It can really mean anything, but in general, a dynamic equalizer is an equalizer that adjusts frequencies based upon the programme. Depending on the manufacture or features wanted are the amount of adjustments that you can make. For example, a “Feedback Destroyer” is a dynamic equalizer – it adjusts certain frequencies to reduce feedback as soon as it detects any. Most of this type are fairly automated, for example a feedback destroyer might only have 2 or 3 buttons for a little bit of customization.
As far as equalization goes with FMOD, the effect provided is only parametric, and each parametric frequency requires an effect processor, so you can only have, at most, 16 bands, assuming you don’t want any other effects. For example in my latest project, I have a “15-band GEQ” which is just 15 of the 16 effects used for parametric EQ and I’ve preset the frequencies that the EQ uses, so the user can only change the gain for each of these frequencies, so it appears as though it is a graphic equalizer.
Hope that helps.
I added eq preset values very easily, much the same way as I assume Nci added them to his project. I downloaded winamp, I hate winamp by the way (massive cpu hog), and I stole the eq values from it. Pretty simple, so now I have 17 presets hehe.
But, I thought eq parameters in FMOD ex is like this :
Center can be found on Winamp’s equalizer, but I don’t know the bandwidth, and the unit of gain in Winamp is db, which is not in FMOD ex.
So how do I imitate those Winamp presets??
- chez0000 answered 12 years ago
Graphic equalizer is the traditional Eq, with bands fixed. Parametric Eq includes other features. The ability to vary the frequencies being adjusted to allow for very precise equalization and the ability to vary the ‘Q’ or width of the filter skirt, to ensure that the frequencies either side of the ones required are not greatly affected. Parametric equalizers lack the “graphic” appearance of Graphic Equalizers and are often perceived as being difficult & complex to operate.
- LeoCombes answered 15 years ago
Hey, I want to set up some equalizer presets (Rock, Pop, Classical, etc.) but I dont know what values are best with each types of music. I dont have all types of music to test and see which values work best. Does anybody have any example preset EQ values that corrispond to each type of music?
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