From the original SynthMaker forum (2004–2014), with its members’ names and dates.
distante ·
Hello!!!!
I know It's a little bit strange, but I want to learn the basics so I can add more bands later.
Does anyone have (or know where I can find) examples of 1 band EQs with fixed Q, Freq and gain? I was trying to understand how to do this by checking the Parametric EQ module, but it is very complex for me now and has some options that get me rather confused than help me. 😕
Thank you
Warmonger ·
EQ with fixed Q and gain is just simplest filter. But you won't find music filters with fixed frequency, they are just not useful.
EQ is just multipole tunable filter or filter bank - more complex, but basing on same principles. Certainly you can't design filters without understanding complex math. But when you do, it's all about chaning mathematical formula into code.
trogluddite ·
What you require is a Band-Pass filter - if you search the forum, there are a few different ones around (the standard filter has a band-pass option). To turn that into an EQ, you need to mix the output of the filter with the original unfiltered audio signal...
You need to set the Cut/Boost knob to a range of -1 to +1 - positive values boost, negative ones cut.
If you need "shelving" low and high EQ bands, use Low-Pass or High-Pass filters instead of the Band-Pass.
martinvicanek ·
Hola distante, here is a prototype of a single band EQ for you to analyze. It has controls for gain, frequency and Q. For more bands just connect similar units in series. With Trog's design you need to take into account a possible phase shift caused by the BP filter. That would have an influence on how the signals combine at the Audio Out connector.
distante ·
Thanks a lot to all!
I'm analysing the RBJ Peaking module that martinvicanek posted.
Like Warmonger said I need to do some research about the maths used in this, but really I don't know where to start 😕
cyto ·
distante wrote: I need to do some research about the maths used in this, but really I don't know where to start 😕
Go to the source. 😉
-cyto
Warmonger ·
Get some good Digital Signal Processing book and get freaked out. Certainly that's not a pleasant lecture for everyone - only for a few, I'd say :P
distante ·
cyto wrote: distante wrote: I need to do some research about the maths used in this, but really I don't know where to start 😕
Go to the source. 😉
-cyto
Thanks!!!!!!!!! 😀
Warmonger wrote: Get some good Digital Signal Processing book and get freaked out. Certainly that's not a pleasant lecture for everyone - only for a few, I'd say :P
I looking for some DSP books, any particular recommendation? 🙂
Warmonger ·
Some proposals in English:
This is what I learned from for the exams: Hayes, Schaum's Outlinein Theory and Problems of Signals and Systems
For newbies and the easiest I know: The Scientist and Engineer's Guide to Digital Signal Processing
Those look good, but I didn't read it thoroughly: Wiley - Fundamentals of Signal Processing for Sound and Vibration Engineers Digital Signal Processing - Filtering Approach
Still, I really doubt one can learn it just from books :P
martinvicanek ·
For a succinct description ask Wikipedia. If you want to read more here is the relevant chapter of a good online DSP book.
distante ·
Thanks!
I will ask some things about this to my tutor, and also to my teacher in the class of electronic.
There are some basic things that I know from others courses that I toked before, like No Linear Systems or Convolution, but I need to be able to apply this to the DSP programming, after all, the idea of "Projects" in my institute is to do some research and ask to the people that know.
Thanks again!
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