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

[Cyrille Henry]

hello,
yes, you are right, there is a typo.
it's
git clone git://pure-data.git.sourceforge.net/gitroot/pure-data/pure-data
(or git clone git://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/ 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
> (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
>>
>> 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/ 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/
>> ~/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/
>> ~/hid
>> cd hid/
>> make
>> pd hid-help.pd
>>
>> The Byron interface (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. 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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