Is an equalizer made out of bandpass filters?



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yes, but possibly you might want to use a certain type of bandpass filter that is designed for eq work.
Try eqfil.

I showed an example here last week.

Victor
On 15 Nov 2012, at 22:42, Cacophony7 wrote:

> Is an equalizer made out of bandpass filters?
> 
> 
> 
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> 
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Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie

So you did, and I remain very grateful!
This is the example referred to:

Victor wrote:
Here's a 1/3-octave graphic equaliser with user-defined number of bands.
It uses a function table to define the gains for each band. 

opcode Eq, a, aiipp
as1,ifreq,itab,ibnd,icnt xin
inxtf = ifreq*2^(1/3)
if (icnt >= ibnd) goto bank
if (inxtf > sr/2) goto bank
as1 Eq as1,inxtf,itab,ibnd,icnt+1
bank:
kgain table ibnd-icnt, itab
ibw = ifreq/1.5
as1 eqfil as1, ifreq, ibw, kgain
xout as1
endop


instr 1
ilowest = 100
imaxbands = 24
itab ftgen 0,0,32,-7,1,10,0.5,10,1,4,1
a1 diskin2 "jarrettm.wav",1
a2 Eq a1,ilowest,itab,imaxbands
outs a2,a2
endin


> yes, but possibly you might want to use a certain type of bandpass filter that is designed for eq work.
> Try eqfil.
> 
> I showed an example here last week.
> 
> 

Great example of recursion! I had never seen it done that way. If I
remember correctly from my programming class, doesn't the base case
usually go first?

Very interesting!

On 11/16/12, Anders Genell  wrote:
> So you did, and I remain very grateful!
> This is the example referred to:
>
> Victor wrote:
> Here's a 1/3-octave graphic equaliser with user-defined number of bands.
> It uses a function table to define the gains for each band.
>
> opcode Eq, a, aiipp
> as1,ifreq,itab,ibnd,icnt xin
> inxtf = ifreq*2^(1/3)
> if (icnt >= ibnd) goto bank
> if (inxtf > sr/2) goto bank
> as1 Eq as1,inxtf,itab,ibnd,icnt+1
> bank:
> kgain table ibnd-icnt, itab
> ibw = ifreq/1.5
> as1 eqfil as1, ifreq, ibw, kgain
> xout as1
> endop
>
>
> instr 1
> ilowest = 100
> imaxbands = 24
> itab ftgen 0,0,32,-7,1,10,0.5,10,1,4,1
> a1 diskin2 "jarrettm.wav",1
> a2 Eq a1,ilowest,itab,imaxbands
> outs a2,a2
> endin
>
>
>> yes, but possibly you might want to use a certain type of bandpass filter
>> that is designed for eq work.
>> Try eqfil.
>>
>> I showed an example here last week.
>>
>>
>
>
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>

Check out Victor's vocoder UDO. Another nice example of recursion.

On 16 November 2012 17:20, Adam Puckett  wrote:
> Great example of recursion! I had never seen it done that way. If I
> remember correctly from my programming class, doesn't the base case
> usually go first?
>
> Very interesting!
>
> On 11/16/12, Anders Genell  wrote:
>> So you did, and I remain very grateful!
>> This is the example referred to:
>>
>> Victor wrote:
>> Here's a 1/3-octave graphic equaliser with user-defined number of bands.
>> It uses a function table to define the gains for each band.
>>
>> opcode Eq, a, aiipp
>> as1,ifreq,itab,ibnd,icnt xin
>> inxtf = ifreq*2^(1/3)
>> if (icnt >= ibnd) goto bank
>> if (inxtf > sr/2) goto bank
>> as1 Eq as1,inxtf,itab,ibnd,icnt+1
>> bank:
>> kgain table ibnd-icnt, itab
>> ibw = ifreq/1.5
>> as1 eqfil as1, ifreq, ibw, kgain
>> xout as1
>> endop
>>
>>
>> instr 1
>> ilowest = 100
>> imaxbands = 24
>> itab ftgen 0,0,32,-7,1,10,0.5,10,1,4,1
>> a1 diskin2 "jarrettm.wav",1
>> a2 Eq a1,ilowest,itab,imaxbands
>> outs a2,a2
>> endin
>>
>>
>>> yes, but possibly you might want to use a certain type of bandpass filter
>>> that is designed for eq work.
>>> Try eqfil.
>>>
>>> I showed an example here last week.
>>>
>>>
>>
>>
>> Send bugs reports to the Sourceforge bug tracker
>>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>> csound"
>>
>>
>
>
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>