Well, the only thing that needs to be changed is the example, as it
is not quite correct. I'll send you the changes later (just a sign change
really).

The opcode had its outputs reversed, which I fixed, but the manual is
correct.

Victor
----- Original Message ----- 
From: "Andres Cabrera" 
To: "Developer discussions" 
Sent: Sunday, January 06, 2008 2:46 PM
Subject: Re: [Cs-dev] Hilbert bug


> Hi,
>
> While taking care of backlogged manual issues, I found this note about
> the hilbert bug, I can't understand if documentation should be changed
> or not, since the comments that were changed in the code in
> opocdes/ugsc.c seem to suggest that documentation should change as well.
>
> Can someone confirm?
>
> Cheers,
> Andrés
>
> El jue, 25-10-2007 a las 08:42 -0700, Steven Yi escribió:
>> I'm with David and am for the change. We should probably put a big
>> WARNING in the manual notifying the non-backwards compatible change
>> (and I would suggest we create a new manual page just for
>> non-backwards compatible changes.  It could have tables for each
>> version that has a non-backwards compatible change and then lists the
>> change, description, and suggestion for how to modify old code).
>>
>> steven
>>
>> On 10/25/07, David Ogborn  wrote:
>> > I would say change the code.
>> >
>> > If any orchestras out there are unconsciously relying on an 
>> > undocumented
>> > "feature" that is the exact opposite of what the documentation 
>> > implies -
>> > then surely those orchestras (and not an improved Csound or its
>> > documentation) should be considered "problematic" rather than 
>> > "normative".
>> >
>> > Conversely, if any orchestras out there are _consciously_ relying on 
>> > the
>> > reversed outputs, it would beg the question of why their authors did 
>> > not
>> > raise the code/documentation mismatch with the Csound community at the
>> > time...  (But probably there are no such orchestras.)
>> >
>> > Yours truly,
>> > David
>> >
>> > Victor Lazzarini wrote:
>> > > (no it's not Goedel going about stuff...)
>> > >
>> > > Still waiting for someone to reply on this. I rechecked and
>> > > the outputs are definitely reversed. Now how do we deal with
>> > > it: change the code or change the manual?
>> > >
>> > > The former will break backward compatibility, but just changing the
>> > > manual will make it not very intuitive (outs being
>> > > imag, real instead of real,imag).
>> > >
>> > > Victor
>> > >
>> > > At 16:57 19/10/2007, you wrote:
>> > >> (no it's not to with his plans for mathematics...)
>> > >>
>> > >> anyway, after almost going crazy checking and
>> > >> rechecking my equations, I realised that the
>> > >> Hilbert transform filter seems to have its
>> > >> outputs the wrong way round. What is the
>> > >> cosine output is the sine output and vice-versa.
>> > >> (No wonder I could not get some ideas to work
>> > >> properly.)
>> > >>
>> > >> Can someone double-check this before we fix it?
>> > >> (I used a sine input and checked the two signals
>> > >> against each other. The 2nd output was in the
>> > >> cosine phase against the 1st one in the sine
>> > >> phase, but at this point I might be wrong).
>> > >>
>> > >> This also explains why the example in the manual
>> > >> has its up and down shifts the wrong way round too.
>> > >>
>> > >> Victor
>> > >>
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>> > >
>> > > Victor Lazzarini
>> > > Music Technology Laboratory
>> > > Music Department
>> > > National University of Ireland, Maynooth
>> > >
>> > >
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