[sdiy] equalizer

[cheater cheater]

how do you split audio into 3 bands using only one filter?

On 10/7/05, Steven Cook <stevenpaulcook at onetel.com> wrote:
> A state-variable filter with fixed frequency and q set at minimum would be
> an easy way to split audio into three bands.
>
> Steven Cook.
>
> http://www.spcplugins.com/
> steve at spcplugins
> sales at spcplugins
>
> > From: cheater cheater <cheater00 at gmail.com>
> > Reply-To: cheater cheater <cheater00 at gmail.com>
> > Date: Fri, 7 Oct 2005 17:31:20 +0200
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: Re: [sdiy] equalizer
> >
> > On 10/7/05, Seb Francis <seb at burnit.co.uk> wrote:
> >> Sounds like you need to use combinations of high-pass / low-pass filters
> >> to get total-kill, rather than just EQ cut.
> >
> > You are totally right.
> >
> > On 10/7/05, Amos <controlvoltage at gmail.com> wrote:
> >> I'm a little rusty on my filter architecture right now... but a band-stop
> >> filter should be just as easy as a bandpass filter, as it's basically the
> >> same thing from a different perspective.  I remember that a cheesy way to
> >> increase the Q of your filter is to use an identical one in series... you
> >> can gang them to the same controls, and then I think total band kill is a
> >> definite possibility.  For some reason most of the band-stop/bandpass
> >> filters I can think of rely on inductors.... but there must be a cheaper R/C
> >> version of the same thing, I just can't think of it.  I'm away from all my
> >> books right now.  And actually, should probably get back to work... ;-)
> >>
> >
> > No, a typical band pass/reject filter won't do - it'll "kill" just the
> > center frequency. The rest of the dip won't be that big.
> >
> > Cheers,
> > D. 8)
> >
> >
> >>
> >> On 10/6/05, cheater cheater <cheater00 at gmail.com > wrote:
> >>> Tempting! It seems to have nice features.
> >>> However, I'm not sure if it has the feature i need most...
> >>> can it totally cut ("kill") each of its bands?
> >>>
> >>> Best regards,
> >>>
> >>> Damian
> >>>
> >>> On 10/6/05, ken mosley <keninverse at gmail.com> wrote:
> >>>> sorry hit send way too fast:
> >>>>
> >>>> how about the Calreq pq1549 project at the gyraf audio site:
> >>>> http://gyraf.dk/gy_pd/calreq/calrec.htm
> >>>>
> >>>> PCBs can be purchased from gustav here:
> >>>>
> >> http://prodigy-pro.com/forum/viewtopic.php?t=233&sid=ef77164249ee072a50c4ad83
> >> 18d132fa
> >>>>
> >>>>
> >>>>
> >>>> ken m.
> >>>>
> >>>> On 10/6/05, ken mosley <keninverse at gmail.com> wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 10/5/05, cheater cheater < cheater00 at gmail.com > wrote:
> >>>>>> yes!
> >>>>>> schematics anyone? :>>
> >>>>>>
> >>>>>> On 10/5/05, dustin sedlacek < dustin.sedlacek at gmail.com> wrote:
> >>>>>>> i personally would love to have a EQ killer or at least know how
> >> to
> >>>> build
> >>>>>>> one , thats a really cool unit i think
> >>>>>>>
> >>>>>>>
> >>>>>>> On 10/4/05, cheater cheater < cheater00 at gmail.com> wrote:
> >>>>>>>> Hey,
> >>>>>>>> very interesting find indeed!
> >>>>>>>> $199 is definitely prohibitive for me :(
> >>>>>>>>
> >>>>>>>> On 10/4/05, Danjel van Tijn < syntheticdan at gmail.com > wrote:
> >>>>>>>>> Have you ever looked at the electrix EQ Killer? I highly
> >> recomend
> >>>>>>>>> incorporatng that design into a DJ mixer. You could actually
> >>>> reverse
> >>>>>>>>> enegineer one if you got it (not such complicated circuitry)
> >>>>>>>>>
> >>>>>>>>> Cheers,
> >>>>>>>>> Danjel
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> On 10/4/05, cheater cheater < cheater00 at gmail.com > wrote:
> >>>>>>>>>> Hi guys,
> >>>>>>>>>>
> >>>>>>>>>> I'm looking to build my own DJ mixer [as, frankly, nothing
> >> on
> >>>> the
> >>>>>>>>>> market is anywhere near what I'm looking for.... :( ]
> >>>>>>>>>>
> >>>>>>>>>> the first step would be to build a good equalizer: something
> >>>> that's
> >>>>>>>>>> four-band and can totally cut out each one of them. I'm
> >> looking
> >>>> for
> >>>>>>>>>> the same kind of thing that's in, for example, the Pioneer
> >>>> DJM-600
> >>>>>>>>>> (this one's 3-band, though), or the Vestax DCR-1200 PRO
> >> (which
> >>>> is a
> >>>>>>>>>> stand-alone equalizer).
> >>>>>>>>>> The Pioneer's EQ, for example, drops the whole band to -36
> >> dB.
> >>>> Without
> >>>>>>>>>> weird resonance. Nice!
> >>>>>>>>>> I haven't personally used the DCR-1200 PRO, but from
> >>>> stories&tales it
> >>>>>>>>>> seems it's the thing I'd want in my mixer.
> >>>>>>>>>> No, I'm not buying 6 of those >:(    ;)
> >>>>>>>>>>
> >>>>>>>>>> I've searched the archives, but not come up with a lot of
> >>>> stuff....
> >>>>>>>>>> some nice reads queued, though :)
> >>>>>>>>>>
> >>>>>>>>>> If anyone could point me in the right direction, perhaps
> >> assist
> >>>> me...
> >>>>>>>>>> [I've never made a complicated circuit like that, but I'm
> >>>> definitely
> >>>>>>>>>> NOT shy of my soldering iron ;) ]
> >>>>>>>>>>
> >>>>>>>>>> Best regards to everyone,
> >>>>>>>>>>
> >>>>>>>>>> Damian
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> --
> >>>>>>> Dustin
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> >
> >
>
>