For all here who don't follow the kernel lists..
Thomas Gleixner has announced a new version of the real-time patch:
https://lkml.org/lkml/2011/7/19/309
Even though most of the pro-audio-relevant preemt-rt patches are already
mainline since 2.6.39, this is still very interesting mostly because:
> What's new in 3.0-rt ?
>
> - No more split soft interrupt threads. We need to analyze whether
> this is a good decision.
>
> - softirq handling from the end of interrupt threads and on all
> thread sites where a nested local_bh disabled section ends
> ...
..and this latency plot is stunning:
https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencyplot-…
enjoy,
robin
Hi everyone,
I want to give hdsp mixer OSC support for fader-, pan, mute and presetcontrol in both directions and input metering.
the OSC client shall be another hdsp mixer instance on the remote machine.
I wanted to know, where i can find the sources?
And if someone has some hints to do that...
Bye Ck
Hi,
Are the proceedings from the LAC printed in any journals? I know Dave did
a report this year but I'm not sure if that counts as published
proceedings when it comes to making things official.
--
Patrick Shirkey
Boost Hardware Ltd
> On 07/18/2011 04:02 AM, pshirkey(a)boosthardware.com wrote:
>>> On 07/17/2011 10:41 AM, Rustom Mody wrote:
>>>> On Sun, Jul 17, 2011 at 1:21 PM, Philipp Ãœberbacher
>>>> <hollunder(a)lavabit.com>wrote:
>>>>
>>>>> Excerpts from Rustom Mody's message of 2011-07-17 05:33:44 +0200:
>>>>>> I am preparing to give a talk on the wider ramifications of music.
>>>>>> One of the things I wish to demonstrate is that things that look
>>>>> different
>>>>>> are merely analogs but at different scales.
>>>>>>
>>>>>> eg if something vibrates at 400Hz we hear a sound of A-flat. If it
>>>>>> 'vibrates' at 4 Hz we hear a beat.
>>>>>> In the same analogy a 2 vs 3 poly-rhythm (should?) change to a do-so
>>>>> chord.
>>>>>> And so on.
>>>>>
>>>>> I suggest you do some experiments before you give a talk. At 4 Hz you
>>>>> won't be able to hear anything, you won't even be able to reproduce a
>>>>> 4 Hz sound with common speakers.
>>>>>
>>>>
>>>> You took me quite literally, [I did put the vibrate into quotes :-) ]
>>>> Let me spell out the experiment in more detail:
>>>> Say I have a rhythm in 4/4 time -- 4 even quarter notes, bar repeating
>>>> every
>>>> second played by say a click. [What kind of click I am not very sure;
>>>> sharp
>>>> with few harmonics would be best I expect]
>>>
>>> Exactly. Just take a short audio-sample (aka grain) and trigger it
>>> repeatedly. Increase the trigger freq. (aka grain-speed) from 4 Hz ->
>>> 400Hz.
>>>
>>> Search the net for granular-synthesis. Your use-case is not the typical
>>> grain-synth application, but the principle is the same.
>>>
>>>> Now if there were some (realtime) way of sliding the tempo from 1 sec
>>>> to
>>>> millisec I expect the separate clicks would vanish into a hum at some
>>>> stage.
>>>>
>>>> This (and other such experiments) is what I want to demo.
>>>> Ive started looking at chuck.
>>>> How does it compare with puredata?
>>>>
>>>
>>> It's a bit of an apples vs oranges question.
>>>
>>> the main difference: Chuck you program in text, pure-data you
>>> graphically connect "objects" (if you know Max/MSP: pure-data is
>>> similar).
>>>
>>> AFAIK, Chuck does not offer GUI elements - you'll need to implement the
>>> slider via OSC or use a "text slider".
>>>
>>>>>> Is there some kind of software where I can make a 4 Hz beat and pull
>>>>>> a
>>>>>> slider or a freq text box entry until it sound like a A-flat note?
>>>>>
>>>>> puredata springs to mind, it's easy to use and has everything you
>>>>> need.
>>>
>>> Indeed. Though chuck, supercollider, csound,... could all do the trick.
>>>
>>> If you know neither of those. Pure-data is probably the easiest to get
>>> started with.
>>>
>>> http://www.timvets.net/video/grains.php will do what you want with Pd.
>>>
>>
>>
>> I'm not sure that does what he wants. He asked for a tool that takes an
>> existing signal/tone and then down tunes it. What you are suggesting
>> creates an emulation of that process but generates a completely new
>> signal/tone.
>>
>> It would achieve a similar sound but is functionally quite a different
>> process.
>
> You are right or course. It's not modeling the desired effect correctly;
> Yet it's close enough and much more robust and convicing for a Demo.
>
> Actually http://www.sonicvisualiser.org/ may be the tool of choice.
> Here's a video where it is used to slow down some Bach so that you can
> hear the "beating/pulsing" introduce by equal-temperament tuning:
> http://www.youtube.com/user/mcldx#p/a/u/0/uOOhvw89jc4
>
That's an interesting feature of that tool. I was not aware of that
functionality. It appears to work on the time domain not the
amplitude/phase of the signal. I assume as it uses a similar code base to
librubber band to achieve that functionality.
IIRC, It is still not quite doing what the original request appeared to
be asking for. i.e. down tuning an existing signal. ( He didn't require
time adjustment )
Would it just be a case for a pitch shifter with a automation fade curve
sone in Ardour/qtractor, etc...?
--
Patrick Shirkey
Boost Hardware Ltd
Hi LADs!
a new free software is born: IceStream -
https://sourceforge.net/projects/icestream/
it's a beta version, we are writing the known bugs & todo, some parts
are in french but it is already possible to use it to mix audio
streaming, to start an icecast from gui and the to send an audio
stream to it or elsewhere. Thanks to mplayer, ices, icecast, vorbis
and jack.
It works with jackd server and use only ogg for the moment (we don't
use mp3 anyway here).
Of course, we are looking for beta-tester and more people are also
welcome to help, support, develop and more if you want!!
mailing list on its way and forum already in place :
https://sourceforge.net/apps/phpbb/icestream/
bug tracker to come ;-)
cheers
Julien
--
APO33
space of research and experimentation
http://www.apo33.org
info(a)apo33.org
