[sdiy] equalizer
Seb Francis
seb at burnit.co.uk
Fri Oct 7 23:46:04 CEST 2005
I think you would need 4 filters for 3 bands (LF uses 1, MF uses 2, HF
uses 1)
Of course that's 8 for stereo.
cheater cheater wrote:
>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
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
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