[PD] Few steps further on analog synth emulation on RPi

Tue Sep 18 10:22:18 CEST 2012

Has he started tweaking Pd yet?? I thought he was only working on the
firmware (or something) of the Pi to improve audio output.

2012/9/18 Antoine Villeret <antoine.villeret at gmail.com>

> to take benefits of all the recents changes miller made to tweak pd for RPi
> i don't know another way to do that
> but any suggestion would be appreciated...
>
> --
> do it yourself
> http://antoine.villeret.free.fr
> http://drii.ensad.fr
> --
> Google lit ce mail...
> si vous refusez cela, utilisez l'adresse antoine.villeret [at] free.frpour me contacter
>
>
>
>
> 2012/9/18 Pierre Massat <pimassat at gmail.com>
>
>> Why do you need to compile it?..
>>
>>
>>
>> 2012/9/17 Cyrille Henry <ch at chnry.net>
>>
>>> hello,
>>> yes, you are right, there is a typo.
>>> it's
>>> git clone git://pure-data.git.**sourceforge.net/gitroot/pure-**
>>> data/pure-data<http://pure-data.git.sourceforge.net/gitroot/pure-data/pure-data>
>>> (or git clone git://pure-data.git.**sourceforge.net/gitroot/pure-**
>>> data/pure-data<http://pure-data.git.sourceforge.net/gitroot/pure-data/pure-data>pure-data)
>>>
>>>
>>> try
>>> sudo apt-get install autoconf
>>>
>>> thanks for the feedback, we will correct the documentation.
>>>
>>> cheers
>>> c
>>>
>>>
>>>
>>> Le 17/09/2012 20:44, m.e.grimm a écrit :
>>>
>>>  hey,
>>>>
>>>> so you know
>>>>
>>>> with this i get:
>>>>
>>>> pi at raspberrypi ~/Desktop/pure-data/src $ git clone
>>>> git://pure-data.git.**sourceforge.net/gitroot/pure-**data/<http://pure-data.git.sourceforge.net/gitroot/pure-data/>pure-data
>>>> Cloning into 'pure-data'...
>>>> fatal: The remote end hung up unexpectedly
>>>>
>>>> so i have to do:
>>>>
>>>> git clone git://pure-data.git.**sourceforge.net/gitroot/pure-**
>>>> data/pure-data<http://pure-data.git.sourceforge.net/gitroot/pure-data/pure-data>
>>>> (no space)
>>>>
>>>> but then i get:
>>>>
>>>> pi at raspberrypi ~/Desktop/pure-data/src $ autoconf-bash: autoconf:
>>>> command not found
>>>>
>>>> where is autoconf?
>>>>
>>>> m
>>>>
>>>> On Sun, Sep 16, 2012 at 6:38 PM, Antoine Villeret
>>>> <antoine.villeret at gmail.com> wrote:
>>>>
>>>>> hi all, here is an up-to-date tutorial to make an analog synth with a
>>>>> Raspberry Pi and pd :
>>>>>
>>>>> 1. installing raspbian on a SD card
>>>>>
>>>>> see instruction :
>>>>> http://www.raspbian.org/
>>>>> http://elinux.org/RPi_Easy_SD_**Card_Setup<http://elinux.org/RPi_Easy_SD_Card_Setup>
>>>>>
>>>>> connect a keyboard, a mouse, an HDMI screen and an ethernet cable with
>>>>> DHCP
>>>>> (to get internet access) and boot on the SD card to configure the OS :
>>>>> - expand root
>>>>> - change keyboard
>>>>> - change password
>>>>> - change local (fr utf8)
>>>>> - change memory split : minimum allocated to video
>>>>> - enable ssh
>>>>> - boot : no desktop
>>>>> - update
>>>>>
>>>>> sudo apt-get update / upgrade
>>>>> sudo reboot
>>>>> log in and start graphical interface :
>>>>> startx
>>>>>
>>>>> 2. installing puredata
>>>>>
>>>>> sudo apt-get install git tk8.5-dev libasound2-dev subversion
>>>>> downloading latest pd :
>>>>>
>>>>> git clone git://pure-data.git.**sourceforge.net/gitroot/pure-**data/<http://pure-data.git.sourceforge.net/gitroot/pure-data/>pure-data
>>>>> cd pure-data/src
>>>>> autoconf
>>>>> ./configure CFLAGS="-mfpu=vfp -mfloat-abi=hard"
>>>>> make
>>>>> sudo make install
>>>>>
>>>>> It takes around 20min to build, be patient.
>>>>> you can start pd using the « pd » command
>>>>>
>>>>> 3. optimising the system for pd :
>>>>>
>>>>> sudo leafpad /etc/security/limits.conf
>>>>> or try nano if you don’t start an X server
>>>>> add
>>>>> * - rtprio 99
>>>>> * - memlock 1000000000
>>>>> start pd and go to media > preference > startup
>>>>> add the following flag in the startup flag field :
>>>>> -rt -alsa -noadc -audiobuf 25
>>>>>
>>>>> then apply and restart pd.
>>>>>
>>>>> 4. test
>>>>>
>>>>> download analog synth emulation patch by Cyrille Henry here :
>>>>> svn checkout
>>>>> https://pure-data.svn.**sourceforge.net/svnroot/pure-**
>>>>> data/trunk/externals/nusmuk/**nusmuk-audio/<https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk/externals/nusmuk/nusmuk-audio/>
>>>>> ~/nusmuk-audio
>>>>> cd ~/nusmuk-audio
>>>>> make
>>>>> cd examples
>>>>> pd analog_synth_emulation.pd
>>>>>
>>>>> 5. Performance :
>>>>>
>>>>> The analog output is very poor now. Some (like Miller) are working on
>>>>> improving it (thanks for their work). The signal to noise ratio is low
>>>>> and
>>>>> there is also some quantization distorsion.
>>>>>
>>>>> On the other hand, one can output some audio through HDMI. We use an
>>>>> HDMI
>>>>> display to convert audio and to send it to good quality loudspeaker. We
>>>>> later tried a USB soundcard (Edirol UA-1A) which works out-of-the-box.
>>>>>
>>>>> We tried to reduce latency without hearing click with the Cyrille’s
>>>>> patch,
>>>>> here are the results :
>>>>> 10 ms latency with USB soundcard
>>>>> 20 ms latency with integrated HDMI audio
>>>>> We also tried to input audio with USB soundcard but audio is crackly
>>>>> as soon
>>>>> as input is enable (with output too).
>>>>>
>>>>> 6. Getting data from real world
>>>>>
>>>>> Most of MIDI-USB interface should work out-of-the-box.
>>>>> With Edirol UM-1EX we get a MIDI loopback between 30 and 35ms.
>>>>>
>>>>> HID works great.
>>>>> svn checkout
>>>>> https://pure-data.svn.**sourceforge.net/svnroot/pure-**
>>>>> data/trunk/externals/hid/<https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk/externals/hid/>
>>>>> ~/hid
>>>>> cd hid/
>>>>> make
>>>>> pd hid-help.pd
>>>>>
>>>>> The Byron interface (http://www.1010.co.uk/org/**byron.html<http://www.1010.co.uk/org/byron.html>)
>>>>> is one of the
>>>>> cheapest way to make a CV-to-computer interface.
>>>>>
>>>>> A TCP loop on a local computer takes less than 1.5 ms.
>>>>>
>>>>> 7. Autologin
>>>>>
>>>>> To enable auto login, we follow this :
>>>>> http://elinux.org/RPi_Debian_**Auto_Login<http://elinux.org/RPi_Debian_Auto_Login>.
>>>>> And to start pd at startup, we
>>>>> follow the steps on the same page but replace startx by ~/autostart.sh
>>>>> wich
>>>>> is a script like this :
>>>>> pd -nogui -audiodev 3 -open
>>>>> ~/nusmuk-audio/examples/**analog_synth_emulation.pd
>>>>>
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>>>>>
>>>>
>>>>
>>>>
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>>
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