Hi Robson,

I think that a great number of opcodes use tables because the
operations they are doing require to some degree non-realtime
operations.  For shifting the signal in realtime, this should do the
job:

http://www.csounds.com/manual/html/pvscale.html

The example in the pvscale manual entry shows how to use it to add a
detuned version to the original to function as a harmonizer,
preserving formants (haven't tried, but that's what it says! =) ).

Hope that helps!
steven


On 2/27/06, Robson Cozendey <russel_rj@hotmail.com> wrote:
> Hi Chaochi,
>
> I was having the same problem some time ago. The first thought to solving
> this is to use the opcode " sndwarp" to shift the pitch, but the problem
> with it is that sndwarp reads from a table, not from an stored signal.
> An option, that I have not tried yet, is to use the UDO "freqShift" which is
> found in:
>
> http://www.csounds.com/udo/displayOpcode.php?opcode_id=50
>
> A possible problem with freqShift is that it moves the harmonics too in a
> linear way, which change the spetrum of the signal and may cause
> inharmonicity for large pitch shifts.
> A problem with so many opcodes of CSound is that they read their signal from
> a table, and it is not possible to read them from a variable.
> Who knows if in the future we will have opcode versions for reading from
> tables and from variables? It would make CSound more suitable for real-time,
> since tables are most useful only for non real-time tasks.
>
>
> >From: "Chaochi Chang" <chaochichang@gmail.com>
> >Reply-To: csound@lists.bath.ac.uk
> >To: <csound@lists.bath.ac.uk>
> >Subject: Re: [Csnd] How can I manipulate input signal?
> >Date: Fri, 24 Feb 2006 10:43:30 -0500
> >
> >
> >Hi Steven
> >Thanks for the information. I am trying to shifting the signal's pitch
> >via a fixed amount. Any suggestion about that? Thanks.
> >
> >Chaochi
> >
> >
> >-----Original Message-----
> >From: Steven Yi [mailto:stevenyi@gmail.com]
> >Sent: Friday, February 24, 2006 3:47 AM
> >To: csound@lists.bath.ac.uk
> >Subject: Re: [Csnd] How can I manipulate input signal?
> >
> >
> >Hi Chaochi,
> >
> >Once you have the signal in, there are many ways to adjust it's
> >character.  You can filter it like any other signal using filters
> >(i.e. butterlp, butterbp, moogvcf, etc.) for coloring, or phase vocode
> >it with another signal to get a different coloring, or convolve the
> >signal with an impule response, etc. It all depends really on what
> >kind of character of sound you are looking for.
> >
> >As for tune, are you trying to tune a signal say like Antares
> >Auto-Tune where the signal becomes quantized to a scale?  Or shifting
> >signal's pitch via a fixed amount (i.e. transposed up a minor second)?
> >
> >steven
> >
> >
> >
> >On 2/23/06, Chaochi Chang <chaochichang@gmail.com> wrote:
> > > Hi All
> > > I try to use "asig1 in" to get the signal from microphone.
> > > I have tried to use "asigout = asig1 * kamp" (kamp is
> > > an adjustable value from FLTK UI)
> > > I want to know what opcode I can use to manipulate the
> > > input signal, such as adjust its tone/tune? Thanks a lot!
> > >
> > > Chaochi
> > > --
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> > >
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