| There are no flags -p or -e in the generic sources. What are they supposed to
do?
==John
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From: J P Fitch
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I have just updated my 'system' so the daily Csound digest archive is updated
automatically rather than when I remember. Hope this helps someone!
....and.....due to a DAT tape failure I have not managed to install the version of csound_win.zip which has the new help file. I am not sure whan this
will happen as I am away on Friday. Shame, as the help file is cool.
==John
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From: J P Fitch
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Which build for Linux are you using?
==John
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From: Mike Berry
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Subject: Re: Phase shift by +-90 degrees?
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> How can one easily do a 90 degree phase-shift on a signal?
>
You can't, unless you can describe all of the frequency components
exactly. The closest you could probably get is to take an FFT and shift
all of the phases by pi/2.
If you know the frequency of the signal, you can delay it by 1/4 of the
wavelength. But this only shifts the fundamental by 90 degrees. Every
partial is going to be shifted by some multiple of 90.
--
Mike Berry
mikeb@nmol.com
http://www.nmol.com/users/mikeb
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Date: Thu, 26 Nov 98 17:12:30 GMT
From: J P Fitch
To: csound@maths.ex.ac.uk
Subject: [Drew Skyfyre: Realtime PowerMac options]
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Date: Thu, 26 Nov 1998 11:40:17 +0530
From: Drew Skyfyre
Subject: Realtime PowerMac options (fwd Csound please)
Hi All,
Just thought I'd air out a few things regarding realtime
music software on the PowerMac. First, to be honest, I
put Csound aside a few months ago, since the performance
on PowerMac really started to put me off.
I've recently been looking into other options.
At the top of my list is SuperCollider
. This is probably the best option
right now. It's programming is text based, like Csound
but simpler. But, you can also make your own graphic
interface and add items to the menu bar from within
your SuperCollider program ("orc/sco") itself.
It cost $250 (I think) but it is solid. Realtime performance
is excellent. Should be able to do (at least)
@16 voices of 2-operator FM in realtime.
Other options :
1) Common Lisp Music (CLM), but unfortunately seems to need
CodeWarrior. (Please correct me if I'm wrong.)
2) Max with MSP : powerful, icon based programming. @$800 total.
Also, a small caveat : although the @$295 fee for MSP is
a permanent license, you have to get a fresh authorization code
every 6 months.
3) Stephen Travis Pope's Siren (written in Squeak Smalltalk)
(Not sure about this one, since it seems to be at version 1.31
for more than 6 months now.)
4) Squeak Smalltalk itself. This variation on Smalltalk is available
on multiple platforms, was developed on the Macintosh itself
(by a team working for Apple) and has built in support for
realtime synthesis. One of the pages documenting how the
language was developed reports that the programmers were able ot
run 10 voices of FM synthesis in realtime on a PowerBook 5300 !!!
Oh yeah, it's free and the source code is public.
5) Nyquist. I don't know much about it, except that it's not
realtime. Probably faster than Csound, though.
Check here :
And, there is LinuxPPC . Yup, Linux
for ALL PowerMacs, including G3s. This appears to be just coming
into it's own. Could be a brave new world for Macs, but still
don't know of anyone using it for music.
Cheers,
Drew
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To: pipe@algonet.se
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Subject: Re: Phase shift by +-90 degrees?
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From: Ed Hall
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Look up "Hilbert Transform" in any good Signal Processing book.
-Ed
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From: Josep M Comajuncosas
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We should learn some things from a program like Supercollider. It
includes a variety of ultraoptimized oscil=B4s opcodes for realtime
performance and, if I=B4m not wrong, it already implements fractional
delay lines with interpolating allpass filters and lagrange
interpolators... we should not be behind it ;-) ... btw I=B4ll use Csound
for a long time simply because I do want to do music right now, no time
to learn another language... but I want to be sure it is still the best
choice ...
J P Fitch wrote:
> Just thought I'd air out a few things regarding realtime
> music software on the PowerMac. First, to be honest, I
> put Csound aside a few months ago, since the performance
> on PowerMac really started to put me off.
>
> I've recently been looking into other options.
>
> At the top of my list is SuperCollider (...)
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From: Josep M Comajuncosas
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Sean Costello wrote:
> Hi everyone:
>
> Has anyone here implemented a phaser in Csound?
The problem is, the existing allpass filter doesn=B4t allow k-rate variat=
ion
of the delay time. Till then, you=B4ll have to deal with delayr/delayw pa=
irs.
H Mikelson has a nice phaser in his multifx orchestra.
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From: Anders Andersson
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Date: Thu, 26 Nov 1998 21:32:53 +0100
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Subject: Re: Phase shift by +-90 degrees?
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>> How can one easily do a 90 degree phase-shift on a signal?
>> =
>You can't, unless you can describe all of the frequency components
>exactly. The closest you could probably get is to take an FFT and shift=
Ok, so there are no easy way as it is with a 180=B0 phaseshift?
When encoding for dolby-surround, the "surround" signal has to
be splitted and phaseshifted +90 and -90 degrees.
I heard that it's not really ok to leave one and shift the other by 180=B0=
=2E
=2E--- -- - -
| Anders "Pipe/Nature" Andersson, pipe@algonet.se
:
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Message-ID: <365E3147.6075C3D3@ibm.net>
Date: Thu, 26 Nov 1998 23:57:43 -0500
From: Job van Zuijlen
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Subject: Re: Phase shift by +-90 degrees?
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I would try to get some information on how this is done in the analog
world. I used to know this 20 years ago :-|
There are applications for which you need a sine as well as a cosine
output over a fairly wide frequency range. This easily done digitally,
but for an analog application you would want to use one sine wave
oscilator and than phase-shift the output 90 degrees. Older analog
implementations of surround sound implementations must have had similar
circuitry. I would search for patents that describe those.
Job van Zuijlen
Anders Andersson wrote:
>=20
> >> How can one easily do a 90 degree phase-shift on a signal?
> >>
> >You can't, unless you can describe all of the frequency components
> >exactly. The closest you could probably get is to take an FFT and shi=
ft
>=20
> Ok, so there are no easy way as it is with a 180=B0 phaseshift?
> When encoding for dolby-surround, the "surround" signal has to
> be splitted and phaseshifted +90 and -90 degrees.
> I heard that it's not really ok to leave one and shift the other by 180=
=B0.
>=20
> .--- -- - -
> | Anders "Pipe/Nature" Andersson, pipe@algonet.se
> :
--=20
Arlington, VA, USA
zuijlen@ibm.net
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From: Job van Zuijlen
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Subject: Re: Windows Specific flags
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>From the manual (v. 3.47):
PC Windows-specific flags
-j num set the number of console text rows (default 25)
-J num set the number of console text columns (default 80)
-K num enables MIDI IN. 'num' (optional) = MIDI IN port device id
number
-q num WAVE OUT device id number (use only if more WAVE devices are
installed)
-p num number of WAVE OUT buffers (default 4; max.
40) <---
-O suppresses all console text output for better realtime
performance
-e allows any sample rate (to use only with WAVE cards supporting
this feature) <---
-y doesn't wait for keypress on exit
-E allows graphic display for WCSHELL by Riccardo Bianchini
-Q num enable MIDI OUT. 'num' (optional) = MIDI OUT port device id
number
-Y suppresses realtime WAVE OUT for better MIDI OUT timing
performance
-* yields control to the system until audio output buffer is full
so I suppose you could expect them in the/a official Windows version of
Csound.
I asked about these as well a little while ago, and also why in some
implementaions these parameters are being proceeded by +-. It may lead
to incompatibility with programs that call Csound.
Job van Zuijlen
J P Fitch wrote:
>
> There are no flags -p or -e in the generic sources. What are they supposed to
> do?
> ==John
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From: Job van Zuijlen
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>From the manual (v. 3.47):
PC Windows-specific flags
-j num set the number of console text rows (default 25)
-J num set the number of console text columns (default 80)
-K num enables MIDI IN. 'num' (optional) = MIDI IN port device id
number
-q num WAVE OUT device id number (use only if more WAVE devices are
installed)
-p num number of WAVE OUT buffers (default 4; max.
40) <---
-O suppresses all console text output for better realtime
performance
-e allows any sample rate (to use only with WAVE cards supporting
this feature) <---
-y doesn't wait for keypress on exit
-E allows graphic display for WCSHELL by Riccardo Bianchini
-Q num enable MIDI OUT. 'num' (optional) = MIDI OUT port device id
number
-Y suppresses realtime WAVE OUT for better MIDI OUT timing
performance
-* yields control to the system until audio output buffer is full
so I suppose you could expect them in the/a official Windows version of
Csound.
I asked about these as well a little while ago, and also why in some
implementaions these parameters are being proceeded by +-. It may lead
to incompatibility with programs that call Csound.
Job van Zuijlen
J P Fitch wrote:
>
> There are no flags -p or -e in the generic sources. What are they supposed to
> do?
> ==John
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From: roger klaveness
To: csound
Subject: Re: Phase shift by +-90 degrees?
Date: Fri, 27 Nov 1998 10:36:22 +0100
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>Look up "Hilbert Transform" in any good Signal Processing book.
you can design here: http://www.cs.york.ac.uk/~fisher/mkfilter/
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