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Raspberry Pi4 announced
Raspberry Pi4 announced
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Old 7th February 2020, 05:44 PM   #111
phofman is online now phofman  Czech Republic
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I would need a few times more :-) Support for high samplerates in SW analyzers
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Old 7th February 2020, 05:56 PM   #112
soundcheck is offline soundcheck  Germany
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I think from PI 2 onwards 384k was possible from a HW perspective.
But. To make absolute sure that everything worked fine
the drivers were limited to 192k by the manufacturers
in the early days.

I think Hifiberry came up with the first driver.
And that had the 192k limit. Some drivers still have it.

And that's the confusing part here.

You basically need to analyze the situation for every single DAC.
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Old 7th February 2020, 07:25 PM   #113
MrGlasspoole is offline MrGlasspoole
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I bought a Odroid C1+ just to find out there is only old stuff (kernel, releases, software).

Now somebody shows at raspberrypi.org that the JustBoom DAC does 32/384

All I'm looking for is a I2S DAC (Stereo Cinch) that does

44.1k/48k/88.2k/96k/176.4k/192k/352.8k/384k @ 16/24/32bit
DSD64/DSD128/DSD256

without up/down sampling.
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Old 8th February 2020, 08:40 AM   #114
soundcheck is offline soundcheck  Germany
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This thread is not about audio devices. Please open your own thread if you look for advise.

THX.


Good luck.
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Old 9th February 2020, 03:13 AM   #115
MrGlasspoole is offline MrGlasspoole
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Sorry, i thought the whole forum is about audio and this thread about the RPi4 capabilities.
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Old 9th February 2020, 07:08 AM   #116
soundcheck is offline soundcheck  Germany
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Quote:
Originally Posted by MrGlasspoole View Post
Sorry, i thought the whole forum is about audio and this thread about the RPi4 capabilities.
Absolutely. There's nothing to be sorry about.

However. After explaining to you the RPi4 I2S capabilities,
you switched topics and asked for a DAC:


Quote:
Originally Posted by MrGlasspoole View Post
All I'm looking for is a I2S DAC (Stereo Cinch) that does

44.1k/48k/88.2k/96k/176.4k/192k/352.8k/384k @ 16/24/32bit
DSD64/DSD128/DSD256

without up/down sampling.
Simply make use of "search", because numerous (HAT-) DACs with all their features have been discussed over the years.
Or if you prefer the lazy-mans approach, simply open a new thread in the "digital-line-level" section and ask your question over there.
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Old 9th February 2020, 12:31 PM   #117
soundcheck is offline soundcheck  Germany
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Today I did a quick benchmark.

@1500MHz I redid my sox resampling benchmarking exercise on the RPi4.

a flac 44.1 >> 352k8

Code:
**************************************************************
*** audio file length   >> 00:06:28.93
*** binary              >> /tmp/sox
*** SRC options         >> rate -v -b 95.0 -p 50 -a 352800 
*** dither options      >> dither -S

real	0m28.171s
user	0m39.928s
sys	0m0.992s

**************************************************************
In comparison the same task on my Broadwell NUC

Code:
**************************************************************
*** audio file length   >> 00:06:28.93
*** binary              >> /tmp/sox
*** SRC options         >> rate -v -b 95.0 -p 50 -a 352800 
*** dither options      >> dither -S

real	0m14,815s
user	0m41,807s
sys	0m0,387s

**************************************************************
"real" is the elapsed time.

It's still half the size on the NUC. And the performance from 3B to 4B has
not changed much. Around 10%.

DSP is still the achilles heel in the RPi universe.

Running an RPi4 as a media server has still its limitations.


Enjoy.

Last edited by soundcheck; 9th February 2020 at 12:36 PM.
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Old 9th February 2020, 01:31 PM   #118
phofman is online now phofman  Czech Republic
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one core of i5-5250 (3MB cache, gcc heavily optimized for SSEx vector instructions) vs. one core of ARM Cortex A72 (1MB cache, very likely not using NEON instructions) - 50% is a good value IMO.
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Old 9th February 2020, 02:19 PM   #119
soundcheck is offline soundcheck  Germany
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Yep. A reasonable value for a RPi. There were times when such a HQ upsampling
wasn't possible at all in realtime.

And, yep , it would probably look even better if the ARM specific optimizations would be used.

Perhaps using ffmpeg (with libsoxr enabled) does a better job. Usually they use the GPU
for processing and on top ffmpeg also comes with a much better multi-threading engine.

Ah. I forgot: the sox binary was compiled with "-mcpu=native", whereas I was using the
standard binary on the NUC.

Last edited by soundcheck; 9th February 2020 at 02:22 PM.
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Old 25th February 2020, 07:11 AM   #120
soundcheck is offline soundcheck  Germany
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The Raspberry PI 4 Version 1.2 is ""on its way"".

* the USB-C Power layout issue has been resolved
* they relocated a SD power-switch
* and then they did some silk screen adjustments due do problems in the production.

One the first glance, I'd say, no major changes or enhancements.

To clearly identify the new board via SW, you can run below command:

Code:
# cat /proc/cpuinfo | grep Revision
You should get this:

Code:
Revision	: c03112
The initial version is c03111.

As usual official RPi Foundation issued information is scarse. You hardly see any official announcements, roadmaps or release plans.
You never really know if old stuff still gets sold to you. That's a bit annoying.

Enjoy.
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