Re: [music-dsp] Low cost DSPs

2017-02-21 Thread Eric Brombaugh

Spencer,

The CS4270 is an ancient but decent codec that I've found to be less 
noisy than the WM8731. There are many others of course.


Fabian,

This depends a lot on what you have in mind when you say "low delay".

* In PCs, much of the audio latency comes from the OS audio drivers and 
application level buffering. In an embedded system such as the STM32 
it's fairly easy to minimize these delays.


* The data interface between the STM32 and codec involves a certain 
amount of delay due to the serial connection and that is difficult to 
eliminate.


* Most all audio codecs these days are sigma-delta designs which 
incorporate a lot of internal filtering which will result in some delay 
and in order to eliminate that you'd need to choose a codec that used 
flash conversion. I suspect that any multi-channel codec (such as the 
8-in/4-out configuration you suggested) would be a sigma-delta design 
and thus would have this kind of delay.


Eric

On 02/21/2017 04:36 AM, Stöter, Fabian-Robert wrote:

Hi Eric, hi Spencer,

I have a related question: can you recommend any multichannel codec that
works nicely with STM32 for the application of low delay mixing: lets
say 8in/4out? Is the stm32 capable enough for this application?

best Fabian


On 20 Feb 2017, at 10:04, Spencer Salazar > wrote:

Hi Eric,

I would definitely be interested to hear more what you'd suggest to
improve the ADC side of things with STM32 + codec, as far as a
low-cost HW/FW audio prototyping platform.

spencer


On Sun, Feb 19, 2017 at 6:22 AM, Eric Brombaugh > wrote:

As the author of one of the pages listed below I'd note that STM32
+ codec is a fairly capable combination. I'd caution however that
the WM8731 may not be the best choice - the DACs are fine but ADC
side is fairly noisy. It's probably fine for some things, but with
a little care and a few extra cents you can do much better.


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Re: [music-dsp] Low cost DSPs

2017-02-21 Thread Stöter , Fabian-Robert
Hi Eric, hi Spencer,

I have a related question: can you recommend any multichannel codec that works 
nicely with STM32 for the application of low delay mixing: lets say 8in/4out? 
Is the stm32 capable enough for this application?

best Fabian

On 20 Feb 2017, at 10:04, Spencer Salazar 
> wrote:

Hi Eric,

I would definitely be interested to hear more what you'd suggest to improve the 
ADC side of things with STM32 + codec, as far as a low-cost HW/FW audio 
prototyping platform.

spencer


On Sun, Feb 19, 2017 at 6:22 AM, Eric Brombaugh 
> wrote:
As the author of one of the pages listed below I'd note that STM32 + codec is a 
fairly capable combination. I'd caution however that the WM8731 may not be the 
best choice - the DACs are fine but ADC side is fairly noisy. It's probably 
fine for some things, but with a little care and a few extra cents you can do 
much better.

Eric

On Feb 18, 2017, at 7:12 PM, Spencer Salazar wrote:

> STM32 ARM + Wolfson WM8731 codec is popular in the modular synth community, 
> e.g.:
>
> http://mutable-instruments.net/modules/clouds/
> https://github.com/pichenettes/eurorack/tree/master/clouds/hardware_design
> http://ebrombaugh.studionebula.com/synth/stm32f4_codec_v2/index.html
> and I think: http://www.makenoisemusic.com/modules/erbe-verb
>
> spencer
>
>
> On Sat, Feb 18, 2017 at 11:10 AM, Emanuel Landeholm 
> > wrote:
> If you target modern GPU:s you will have  a truly huge platform with massive 
> computational power. Just a thought.
>
> On Thu, 16 Feb 2017 at 05:03, Pablo Riera 
> > wrote:
> Hi,
>
> I am collecting information on how to accomplish DSP projects (mainly synths, 
> only output) with low cost or makers boards.
>
> -Arduino Uno 16 bit PWM, 25 usd
> -Arduino Due 12 bit DAC, 50 usd
> -Beaglebone + Bela 16 bit DAC, 170 usd
> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
> -16 bit DAC module, 5 usd (and some fast board, Due? )
>
> I am not sure about maximum sampling rate for each case, but I think they all 
> reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run code 
> at higher bit depths and rates but DAC outputs at CD quality.
>
> Does anyone has experience with some of these combinations or others and 
> could share comments on technical issues, ease of use, latency, audio quality 
> (noise, max sampling rate), etc.
>
> Thanks in advance. Great list by the way.
> Pablo
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91058 Erlangen
Tel.: 09131 85-20518
Fax: 09131 85-20524
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Re: [music-dsp] Low cost DSPs

2017-02-20 Thread Spencer Salazar
Hi Eric,

I would definitely be interested to hear more what you'd suggest to improve
the ADC side of things with STM32 + codec, as far as a low-cost HW/FW audio
prototyping platform.

spencer


On Sun, Feb 19, 2017 at 6:22 AM, Eric Brombaugh  wrote:

> As the author of one of the pages listed below I'd note that STM32 + codec
> is a fairly capable combination. I'd caution however that the WM8731 may
> not be the best choice - the DACs are fine but ADC side is fairly noisy.
> It's probably fine for some things, but with a little care and a few extra
> cents you can do much better.
>
> Eric
>
> On Feb 18, 2017, at 7:12 PM, Spencer Salazar wrote:
>
> > STM32 ARM + Wolfson WM8731 codec is popular in the modular synth
> community, e.g.:
> >
> > http://mutable-instruments.net/modules/clouds/
> > https://github.com/pichenettes/eurorack/tree/
> master/clouds/hardware_design
> > http://ebrombaugh.studionebula.com/synth/stm32f4_codec_v2/index.html
> > and I think: http://www.makenoisemusic.com/modules/erbe-verb
> >
> > spencer
> >
> >
> > On Sat, Feb 18, 2017 at 11:10 AM, Emanuel Landeholm <
> emanuel.landeh...@gmail.com> wrote:
> > If you target modern GPU:s you will have  a truly huge platform with
> massive computational power. Just a thought.
> >
> > On Thu, 16 Feb 2017 at 05:03, Pablo Riera  wrote:
> > Hi,
> >
> > I am collecting information on how to accomplish DSP projects (mainly
> synths, only output) with low cost or makers boards.
> >
> > -Arduino Uno 16 bit PWM, 25 usd
> > -Arduino Due 12 bit DAC, 50 usd
> > -Beaglebone + Bela 16 bit DAC, 170 usd
> > -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
> > -16 bit DAC module, 5 usd (and some fast board, Due? )
> >
> > I am not sure about maximum sampling rate for each case, but I think
> they all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice
> to run code at higher bit depths and rates but DAC outputs at CD quality.
> >
> > Does anyone has experience with some of these combinations or others and
> could share comments on technical issues, ease of use, latency, audio
> quality (noise, max sampling rate), etc.
> >
> > Thanks in advance. Great list by the way.
> > Pablo
> > ___
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> > music-dsp@music.columbia.edu
> > https://lists.columbia.edu/mailman/listinfo/music-dsp
> >
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Re: [music-dsp] Low cost DSPs

2017-02-19 Thread Eric Brombaugh
As the author of one of the pages listed below I'd note that STM32 + codec is a 
fairly capable combination. I'd caution however that the WM8731 may not be the 
best choice - the DACs are fine but ADC side is fairly noisy. It's probably 
fine for some things, but with a little care and a few extra cents you can do 
much better.

Eric

On Feb 18, 2017, at 7:12 PM, Spencer Salazar wrote:

> STM32 ARM + Wolfson WM8731 codec is popular in the modular synth community, 
> e.g.:
> 
> http://mutable-instruments.net/modules/clouds/
> https://github.com/pichenettes/eurorack/tree/master/clouds/hardware_design
> http://ebrombaugh.studionebula.com/synth/stm32f4_codec_v2/index.html
> and I think: http://www.makenoisemusic.com/modules/erbe-verb
> 
> spencer
> 
> 
> On Sat, Feb 18, 2017 at 11:10 AM, Emanuel Landeholm 
>  wrote:
> If you target modern GPU:s you will have  a truly huge platform with massive 
> computational power. Just a thought.
> 
> On Thu, 16 Feb 2017 at 05:03, Pablo Riera  wrote:
> Hi,  
> 
> I am collecting information on how to accomplish DSP projects (mainly synths, 
> only output) with low cost or makers boards. 
> 
> -Arduino Uno 16 bit PWM, 25 usd
> -Arduino Due 12 bit DAC, 50 usd
> -Beaglebone + Bela 16 bit DAC, 170 usd
> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd 
> -16 bit DAC module, 5 usd (and some fast board, Due? ) 
> 
> I am not sure about maximum sampling rate for each case, but I think they all 
> reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run code 
> at higher bit depths and rates but DAC outputs at CD quality. 
> 
> Does anyone has experience with some of these combinations or others and 
> could share comments on technical issues, ease of use, latency, audio quality 
> (noise, max sampling rate), etc. 
> 
> Thanks in advance. Great list by the way. 
> Pablo
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Re: [music-dsp] Low cost DSPs

2017-02-18 Thread Spencer Salazar
STM32 ARM + Wolfson WM8731 codec is popular in the modular synth community,
e.g.:

http://mutable-instruments.net/modules/clouds/
https://github.com/pichenettes/eurorack/tree/master/clouds/hardware_design
http://ebrombaugh.studionebula.com/synth/stm32f4_codec_v2/index.html
and I think: http://www.makenoisemusic.com/modules/erbe-verb

spencer


On Sat, Feb 18, 2017 at 11:10 AM, Emanuel Landeholm <
emanuel.landeh...@gmail.com> wrote:

> If you target modern GPU:s you will have  a truly huge platform with
> massive computational power. Just a thought.
>
> On Thu, 16 Feb 2017 at 05:03, Pablo Riera  wrote:
>
>> Hi,
>>
>> I am collecting information on how to accomplish DSP projects (mainly
>> synths, only output) with low cost or makers boards.
>>
>> -Arduino Uno 16 bit PWM, 25 usd
>> -Arduino Due 12 bit DAC, 50 usd
>> -Beaglebone + Bela 16 bit DAC, 170 usd
>> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
>> -16 bit DAC module, 5 usd (and some fast board, Due? )
>>
>> I am not sure about maximum sampling rate for each case, but I think they
>> all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run
>> code at higher bit depths and rates but DAC outputs at CD quality.
>>
>> Does anyone has experience with some of these combinations or others and
>> could share comments on technical issues, ease of use, latency, audio
>> quality (noise, max sampling rate), etc.
>>
>> Thanks in advance. Great list by the way.
>> Pablo
>> ___
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>> https://lists.columbia.edu/mailman/listinfo/music-dsp
>
>
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Re: [music-dsp] Low cost DSPs

2017-02-18 Thread Emanuel Landeholm
If you target modern GPU:s you will have  a truly huge platform with
massive computational power. Just a thought.

On Thu, 16 Feb 2017 at 05:03, Pablo Riera  wrote:

> Hi,
>
> I am collecting information on how to accomplish DSP projects (mainly
> synths, only output) with low cost or makers boards.
>
> -Arduino Uno 16 bit PWM, 25 usd
> -Arduino Due 12 bit DAC, 50 usd
> -Beaglebone + Bela 16 bit DAC, 170 usd
> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
> -16 bit DAC module, 5 usd (and some fast board, Due? )
>
> I am not sure about maximum sampling rate for each case, but I think they
> all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run
> code at higher bit depths and rates but DAC outputs at CD quality.
>
> Does anyone has experience with some of these combinations or others and
> could share comments on technical issues, ease of use, latency, audio
> quality (noise, max sampling rate), etc.
>
> Thanks in advance. Great list by the way.
> Pablo
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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread robert bristow-johnson



�
the target is more for stomp boxes, and i am curious as to where the intended 
market is or will be but the Snowbird from Danville Signal Processing has a 
21479 SHArC DSP in it. �i've done some assembly level coding on it. �i dunno 
how to buy it other than to contact the
manufacturer. �the owner, Al Clark, had been at one time hanging out here, and 
might still be.
r b-j


 Original Message 

Subject: Re: [music-dsp] Low cost DSPs

From: "Pablo Riera" <pablo.ri...@gmail.com>

Date: Thu, February 16, 2017 6:02 am

To: "A discussion list for music-related DSP" <music-dsp@music.columbia.edu>

--



> Yes! I forgot Axoloti. Great specs and price.

>

> El jue, feb 16, 2017 01:40 AM, Bennett Dobni <bdo...@gmail.com> escribi�:

>

>> http://www.axoloti.com/

>>

>>

>>

>>

>> On Wed, Feb 15, 2017 at 11:02 PM, Pablo Riera <pablo.ri...@gmail.com>

>> wrote:

>>

>> Hi,

>>

>> I am collecting information on how to accomplish DSP projects (mainly

>> synths, only output) with low cost or makers boards.

>>

>> -Arduino Uno 16 bit PWM, 25 usd

>> -Arduino Due 12 bit DAC, 50 usd

>> -Beaglebone + Bela 16 bit DAC, 170 usd

>> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd

>> -16 bit DAC module, 5 usd (and some fast board, Due? )

>>

>> I am not sure about maximum sampling rate for each case, but I think they

>> all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run

>> code at higher bit depths and rates but DAC outputs at CD quality.

>>

>> Does anyone has experience with some of these combinations or others and

>> could share comments on technical issues, ease of use, latency, audio

>> quality (noise, max sampling rate), etc.

>>

>> Thanks in advance. Great list by the way.

>> Pablo

>>



--
r b-j � � � � � � � � �r...@audioimagination.com
"Imagination is more important than knowledge."
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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Andrew McPherson
On Wed, Feb 15, 2017 at 11:02 PM, Pablo Riera  wrote:

> I am collecting information on how to accomplish DSP projects (mainly
> synths, only output) with low cost or makers boards.
> 
> -Arduino Uno 16 bit PWM, 25 usd
> -Arduino Due 12 bit DAC, 50 usd
> -Beaglebone + Bela 16 bit DAC, 170 usd
> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
> -16 bit DAC module, 5 usd (and some fast board, Due? )
> 
> I am not sure about maximum sampling rate for each case, but I think they
> all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run
> code at higher bit depths and rates but DAC outputs at CD quality.
> 
> Does anyone has experience with some of these combinations or others and
> could share comments on technical issues, ease of use, latency, audio
> quality (noise, max sampling rate), etc.
> 
> Thanks in advance. Great list by the way.
> Pablo

I'm one of the developers of Bela and can supply a bit more info. It has a 
16-bit stereo audio ADC and DAC, plus 8x each of 16-bit DC-coupled analog I/O.

Low latency was one of our core design principles for Bela. We use a Xenomai 
Linux environment to get audio buffer sizes as small as 2 samples, producing 
round-trip audio latency as low as 1ms (or down to 100us using the non-audio 
analog I/Os). The design also samples the analog and digital I/Os at audio 
rates, synchronously with the audio clock. You can a paper about how the 
environment works here:

http://www.eecs.qmul.ac.uk/~andrewm/mcpherson_aes2015.pdf

(More info at http://bela.io and https://github.com/BelaPlatform/Bela/wiki.)

The CPU on the BeagleBone Black isn't as powerful as the Pi3; on the other 
hand, the hard real-time audio environment means that you can run with much 
smaller latencies without glitches, as long as your code is fast enough to run 
in real time. At the moment we support C/C++ and Pd with experimental support 
for a few other languages and environments (SuperCollider, FAUST, Pyo).

Andrew

--
Andrew McPherson
Reader in Digital Media
Centre for Digital Music
School of Electronic Engineering and Computer Science
Queen Mary, University of London
Mile End Road
London E1 4NS

Phone: +44 (0)20 7882 5774
Email: a.mcpher...@qmul.ac.uk
Web: http://www.eecs.qmul.ac.uk/~andrewm
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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Laurent de Soras

Philippe Wicker wrote:


the A15 is not good at providing a sustained high cpu usage
without getting rapidly too hot.You rapidly get a throttling
cpu (the OS reduces the core frequency to a bare minimum
[...]
the code compiled in 64bit for the 1.5GHz C2 runs nearly as
fast than the same code compiled  in 32bit modes for the
1.8GHz RK3288, and 1.5 faster than the  32bit 1.2GHz PI3.


Good to know. I was wondering if I could replace my Pi 3 with
a XU4 but the heat issue is a no go and it seems that the C2 is
actually a better solution.


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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Philippe Wicker

> On 16 Feb 2017, at 13:49, Laurent de Soras  wrote:
> 
> Pablo Riera wrote:
>> 
>> I try some stuff on Rpi with supercollider + jack but I couldn't
>> manage to have lots of performance. As a synth it would crash
>> with more than 6 polyphony with 256 sample buffers. I think
>> the supercollider build  was messed up but need more
>> testing. What audio framework are you using?
> 
> I first tested Jack then directly attacked ALSA, but performance
> was similar.

It’s not surprising because JACK relies on the underlying drivers to “talk” 
with the audio device and those drivers likely are ALSA drivers.

> My framework is just plain C++, with specific NEON
> optimisations when possible. I don’t know about Supercollider
> performance.
> 
> Also don’t forget that the the newer RPi 3 is much faster than
> the first gen RPi for just a few more bucks.

There’s also the ODROID C2 which is a “card sized” board embedding a quad 
1.5GHz cortex-a53. This board uses a 64bit kernel, that is it runs applications 
in 64 bit mode (ARMV8) while the PI3 runs a 32bit kernel (ARMV7).

> And if you need even
> more horsepower the Odroid-XU4 looks pretty nice (and twice more
> expensive).

I own an XU4 myself. That’s indeed a powerful board based on an octal core 
processor (4*A15 + 4*A7). But the A15 is not good at providing a sustained high 
cpu usage without getting rapidly too hot.You rapidly get a throttling cpu (the 
OS reduces the core frequency to a bare minimum - 900MHz instead of 1.7GHz if I 
remember well).

There also exist boards based on Rockchip quad core 1.8GHz Cortex-A12 RK3288  
(look at MiQi or Firefly on the web).

I’ve not yet been able to make extensive cpu comparison between all these 
processors. What I can say is that a bench based on an analog filter emulation 
spent 600 on a PI3, and about 400 on both RK3288 and ODROID-C2. The interesting 
result is that the code compiled in 64bit for the 1.5GHz C2 runs nearly as fast 
than the same code compiled in 32bit modes for the 1.8GHz RK3288, and 1.5 
faster than the 32bit 1.2GHz PI3.

> 
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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Laurent de Soras

Pablo Riera wrote:


I try some stuff on Rpi with supercollider + jack but I couldn't
manage to have lots of performance. As a synth it would crash
with more than 6 polyphony with 256 sample buffers. I think
the supercollider build  was messed up but need more
testing. What audio framework are you using?


I first tested Jack then directly attacked ALSA, but performance
was similar. My framework is just plain C++, with specific NEON
optimisations when possible. I don’t know about Supercollider
performance.

Also don’t forget that the the newer RPi 3 is much faster than
the first gen RPi for just a few more bucks. And if you need even
more horsepower the Odroid-XU4 looks pretty nice (and twice more
expensive).

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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Teemu Pohjanlehto
Xmos dev boards are also something to think of. You lose the easy "Hey
there is a ready-made library for almost everything" you have with Teensy
or Arduino, but you gain a lot of processing power for little money.

I have used the cheapest one:
https://www.xmos.com/support/boards?product=17441

There is also an option for much faster dev boards.

On 16 February 2017 at 13:17, Pablo Riera  wrote:

>
>
> El jue, feb 16, 2017 06:11 AM, Laurent de Soras 
> escribió:
>
>
> > Does anyone has experience with some of these combinations
> > or others
>
> Teensy + audio board is popular too.
>
>
> Great. This looks pretty good https://www.pjrc.com/
> store/teensy3_audio.html
>
> > and could share comments on technical issues, ease
> > of use, latency, audio quality (noise, max sampling rate), etc.
>
> I’m working on something using a Raspberry Pi 3 + USB audio.
> Latency is decent but not mindblowing : 13 ms for an audio
> roundtrip with 64-sample buffers. You might have better
> performances with I2S boards.
>
>
> I try some stuff on Rpi with supercollider + jack but I couldn't manage to
> have lots of performance. As a synth it would crash with more than 6
> polyphony with 256 sample buffers. I think the supercollider build  was
> messed up but need more testing. What audio framework are you using?
>
> Audio quality depends on the audio interface. If the card is
> powered by the USB port, watch for the noise coming from the
> RPi.
>
> For the ease of use, it’s a complete Linux system.
>
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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Pablo Riera
El jue, feb 16, 2017 06:11 AM, Laurent de Soras 
escribió:


> Does anyone has experience with some of these combinations
> or others

Teensy + audio board is popular too.


Great. This looks pretty good https://www.pjrc.com/store/teensy3_audio.html

> and could share comments on technical issues, ease
> of use, latency, audio quality (noise, max sampling rate), etc.

I’m working on something using a Raspberry Pi 3 + USB audio.
Latency is decent but not mindblowing : 13 ms for an audio
roundtrip with 64-sample buffers. You might have better
performances with I2S boards.


I try some stuff on Rpi with supercollider + jack but I couldn't manage to
have lots of performance. As a synth it would crash with more than 6
polyphony with 256 sample buffers. I think the supercollider build  was
messed up but need more testing. What audio framework are you using?

Audio quality depends on the audio interface. If the card is
powered by the USB port, watch for the noise coming from the
RPi.

For the ease of use, it’s a complete Linux system.

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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Pablo Riera
Yes! I forgot Axoloti. Great specs and price.

El jue, feb 16, 2017 01:40 AM, Bennett Dobni  escribió:

> http://www.axoloti.com/
>
>
>
>
> On Wed, Feb 15, 2017 at 11:02 PM, Pablo Riera 
> wrote:
>
> Hi,
>
> I am collecting information on how to accomplish DSP projects (mainly
> synths, only output) with low cost or makers boards.
>
> -Arduino Uno 16 bit PWM, 25 usd
> -Arduino Due 12 bit DAC, 50 usd
> -Beaglebone + Bela 16 bit DAC, 170 usd
> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
> -16 bit DAC module, 5 usd (and some fast board, Due? )
>
> I am not sure about maximum sampling rate for each case, but I think they
> all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run
> code at higher bit depths and rates but DAC outputs at CD quality.
>
> Does anyone has experience with some of these combinations or others and
> could share comments on technical issues, ease of use, latency, audio
> quality (noise, max sampling rate), etc.
>
> Thanks in advance. Great list by the way.
> Pablo
>
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Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Laurent de Soras



Does anyone has experience with some of these combinations
or others


Teensy + audio board is popular too.


and could share comments on technical issues, ease
of use, latency, audio quality (noise, max sampling rate), etc.


I’m working on something using a Raspberry Pi 3 + USB audio.
Latency is decent but not mindblowing : 13 ms for an audio
roundtrip with 64-sample buffers. You might have better
performances with I2S boards.

Audio quality depends on the audio interface. If the card is
powered by the USB port, watch for the noise coming from the
RPi.

For the ease of use, it’s a complete Linux system.

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Re: [music-dsp] Low cost DSPs

2017-02-15 Thread Bennett Dobni
http://www.axoloti.com/




On Wed, Feb 15, 2017 at 11:02 PM, Pablo Riera  wrote:

> Hi,
>
> I am collecting information on how to accomplish DSP projects (mainly
> synths, only output) with low cost or makers boards.
>
> -Arduino Uno 16 bit PWM, 25 usd
> -Arduino Due 12 bit DAC, 50 usd
> -Beaglebone + Bela 16 bit DAC, 170 usd
> -Raspberry Pi + Behringher Uca22216 bit DAC, 70 usd
> -16 bit DAC module, 5 usd (and some fast board, Due? )
>
> I am not sure about maximum sampling rate for each case, but I think they
> all reach 44.1 kHz, (maybe not for the arduino UNO). It will be nice to run
> code at higher bit depths and rates but DAC outputs at CD quality.
>
> Does anyone has experience with some of these combinations or others and
> could share comments on technical issues, ease of use, latency, audio
> quality (noise, max sampling rate), etc.
>
> Thanks in advance. Great list by the way.
> Pablo
>
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