It passes "All" frequencies, high or low (within limits), but does so in a way that keeps all the filter's poles and zeros lined up in a specific way. So, it has to do with the phase math or complex numbers math of filters. An Allpass has a specific math form to adheres to just like High-pass, Low-pass, Band-pass and Notch filters do. 

Hope that helps. More later on my lunch break, if you like.
- Partev   :-)



----------------------------------------------------------------------------------------------------

--- rorywalsh@ear.ie wrote:

From: Rory Walsh 
To: csound@lists.bath.ac.uk
Subject: [Csnd] Re:  RE: alpass opcode...
Date: Tue, 19 Feb 2008 09:38:02 +0000

Give that it's an 'allpass' filter, I would have thought 'allpass' would 
have been a better name. Perhaps it's something to do with the length of 
opcode names as Alex suggests. I'm just curious.

Rory.


  Partev Barr Sarkissian wrote:
> Could you elaborate?
> - Partev
> 
> --- rorywalsh@ear.ie wrote:
> 
> From: Rory Walsh 
> To: csound@lists.bath.ac.uk
> Subject: [Csnd] alpass opcode...
> Date: Sat, 16 Feb 2008 18:40:20 +0000
> 
> Wouldn't "allpass" have been better name?
> 
> Rory.
> 
> 
> Send bugs reports to this list.
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> 
> 
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Partev,

I think you misunderstood Rory's question. What Rory meant was why  
the opcode is written with a single L instead of two.

Alex


On Feb 19, 2008, at 5:19 PM, Partev Barr Sarkissian wrote:

> It passes "All" frequencies, high or low (within limits), but does  
> so in a way that keeps all the filter's poles and zeros lined up in  
> a specific way. So, it has to do with the phase math or complex  
> numbers math of filters. An Allpass has a specific math form to  
> adheres to just like High-pass, Low-pass, Band-pass and Notch  
> filters do.
>
> Hope that helps. More later on my lunch break, if you like.
> - Partev   :-)
>
>
>
> ---------------------------------------------------------------------- 
> ------------------------------
>
> --- rorywalsh@ear.ie wrote:
>
> From: Rory Walsh 
> To: csound@lists.bath.ac.uk
> Subject: [Csnd] Re:  RE: alpass opcode...
> Date: Tue, 19 Feb 2008 09:38:02 +0000
>
> Give that it's an 'allpass' filter, I would have thought 'allpass'  
> would
> have been a better name. Perhaps it's something to do with the  
> length of
> opcode names as Alex suggests. I'm just curious.
>
> Rory.
>
>
>   Partev Barr Sarkissian wrote:
>> Could you elaborate?
>> - Partev
>>
>> --- rorywalsh@ear.ie wrote:
>>
>> From: Rory Walsh 
>> To: csound@lists.bath.ac.uk
>> Subject: [Csnd] alpass opcode...
>> Date: Sat, 16 Feb 2008 18:40:20 +0000
>>
>> Wouldn't "allpass" have been better name?
>>
>> Rory.
>>
>>
>> Send bugs reports to this list.
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body  
>> "unsubscribe csound"
>>
>>
>>
>>
>> _____________________________________________________________
>> Netscape.  Just the Net You Need.
>>
>>
>> Send bugs reports to this list.
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>> "unsubscribe csound"
>>
>
>
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I know what an aLLpass filter is but I've never heard of an aLpass 
filter. I like Chuck suggestion that the second L was filtered out!

Rory.


  Partev Barr Sarkissian wrote:
> It passes "All" frequencies, high or low (within limits), but does so in a way that keeps all the filter's poles and zeros lined up in a specific way. So, it has to do with the phase math or complex numbers math of filters. An Allpass has a specific math form to adheres to just like High-pass, Low-pass, Band-pass and Notch filters do. 
> 
> Hope that helps. More later on my lunch break, if you like.
> - Partev   :-)
> 
> 
> 
> ----------------------------------------------------------------------------------------------------
> 
> --- rorywalsh@ear.ie wrote:
> 
> From: Rory Walsh 
> To: csound@lists.bath.ac.uk
> Subject: [Csnd] Re:  RE: alpass opcode...
> Date: Tue, 19 Feb 2008 09:38:02 +0000
> 
> Give that it's an 'allpass' filter, I would have thought 'allpass' would 
> have been a better name. Perhaps it's something to do with the length of 
> opcode names as Alex suggests. I'm just curious.
> 
> Rory.
> 
> 
>   Partev Barr Sarkissian wrote:
>> Could you elaborate?
>> - Partev
>>
>> --- rorywalsh@ear.ie wrote:
>>
>> From: Rory Walsh 
>> To: csound@lists.bath.ac.uk
>> Subject: [Csnd] alpass opcode...
>> Date: Sat, 16 Feb 2008 18:40:20 +0000
>>
>> Wouldn't "allpass" have been better name?
>>
>> Rory.
>>
>>
>> Send bugs reports to this list.
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>>
>>
>>
>>
>> _____________________________________________________________
>> Netscape.  Just the Net You Need.
>>
>>
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> 
> 
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> 
> 
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