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#apertus IRC Channel Logs

2017/03/29

Timezone: UTC


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RexOrCine[m]
Class
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05:40
xfxf
nice footage! optics/sensor seem super decent
06:37
Bertl_zZ
changed nick to: Bertl
06:37
Bertl
morning folks!
06:37
Bertl
xfxf: glad you liked it
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se6astian|away
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08:25
se6astian
good morning
08:33
se6astian
community color grades added to article: https://www.apertus.org/axiom-team-talk-volume-12.3-article-march-2017
08:33
se6astian
many thanks for the contribution!
08:39
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08:56
se6astian
hi xeechou!
09:17
atoav
Hi
09:18
atoav
I am looking into the audio extension and asked myself what kind of busses would exist in the module system
09:20
atoav
This boils down to two questions:
09:20
atoav
1. What power rails/voltages does the axiom supply?
09:21
atoav
2. Is there any bus that could be used to transfer the ADC converted audio streams?
09:22
atoav
If somebody has a good idea of those things, please append to this thread: https://lab.apertus.org/T361
09:44
se6astian
There are multiple options
09:45
se6astian
for audio a shield would be most suitable
09:45
se6astian
Bertl: can share the technical details
09:48
atoav
Cool
09:52
Bertl
the shields are connected directly to the routing fabrics with 2x10 GPIOs and 4 LVDS pairs
09:53
Bertl
there are two power rails for each shield, one is the IO voltage and the other can be used for powering electronics on the shields (typically 3.3V)
09:58
atoav
Bertl, thanks! for high quality preamps 3.3V is too little, we will have to bake our own for the audio shield (which is the better choice for running sensetive ADCs maybe anyways).
09:58
atoav
What is the IO voltage?
09:58
Bertl
2.5V typically
10:00
Bertl
btw, I wouldn't put a high quality preamp on the shield, there is a lot going on in the direct vicinity, so it probably will pick up a lot of switching noise
10:01
Bertl
i.e. probably better to put the audio part into a separate and shielded enclosure
10:01
atoav
Thought so. Mhhh It would require at least ±5V, and +48V for phantom powering the microphones
10:02
Bertl
all those voltages will have to be generated, unless you want to go with a separate set of batteries as well
10:03
Bertl
but I don't think that you will need much power there, so that should be fine
10:04
atoav
I think a seperate set of batteries should be avoided from a user perspective
10:08
Bertl
the question I was asking myself is: who would be the target audience for a high quality audio recording solution embedded into the AXIOM Beta?
10:08
Bertl
because I presume that when high quality is a requirement, there will be a separate audio crew and separate recording devices anyway
10:09
Bertl
while OTOH, when we are talking the typical indie movie maker, the question remains: does it need to be that high end?
10:12
Bertl
btw, the ODAC link is for audio output
10:15
atoav
With the ODAC ytou're right, was my fault. I would focus on documentary style filmmakers, they are the ones where at least 2 XLR inputs on Camera would make sense. At least my documentary collegues are most of the times very happy about having it
10:15
Bertl
XLR is huge compared to the AXIOM Beta (and the Shields)
10:16
Bertl
so you need a separate 'plug-box' anyway
10:16
atoav
Aha, I was thinking about a dedicated module anyways
10:17
atoav
mhh
10:17
Bertl
I would go to pure digital in that box, maybe input and output if you like to use headphones or similar
10:17
Bertl
then stamp and CRC/ECC the data and send it over a simple serial link to the Beta (e.g. via one of the existing shields)
10:18
atoav
exactly that was the idea. To have a box/module, that just spits out digital audio streams for the axiom
10:18
atoav
maybe a headphone output
10:18
atoav
maybe embedded cheap cardoids for syncing when no external mics are used
10:20
atoav
I am not that fit with stepping and inverting powersupplies though, where I come from linear powersupplies are used
10:24
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10:25
atoav
Bertl, thanks anyways
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10:26
Bertl
I'm sure that Linear, TI, AnalogDevices and others provide solutions for low noise audio power rails
10:26
Bertl
so it is more searching for the right part
10:26
comradekingu
http://www.beis.de/Elektronik/Electronics.html has some solutions
10:27
comradekingu
that come schematics supplied
10:28
atoav
comradekingu. cool stuff
10:28
comradekingu
skimming backlog i know there are some sheild type things for i2c and whatnot, from elsewhere
10:29
comradekingu
https://www.thomann.de/gb/mytek_digital_stereo_192_adc.htm looks to have DC power
10:31
comradekingu
But it would be a phantom power box, and another one afterwards
10:31
atoav
Bertl, right. I think I need to reconsider the whole specification thing. I somehow thought this could be a Gamma Module but to be honest, I have no idea what would integrate best with the current designs
10:57
Bertl
off for now ... bbl
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Bertl
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14:21
xeechou
Hi, I am looking for to talk with BAndiT1983, do you guys know when he is usually online, please?
14:21
Bertl_oO
in the evening (CEST)
14:30
se6astian
hi xeechou: BAndiT1983|away should be here in 3h roughly
14:32
xeechou
Oh okay, thanks for the info
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BAndiT1983
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15:40
BAndiT1983
Hi xeechou
15:40
xeechou
Hi
15:42
BAndiT1983
So, what are your questions? I'm on my mobile, because not at home, but can still reply
15:44
xeechou
OCLauncher is the right application to open?
15:45
BAndiT1983
At the moment no, OC backup or processing test are more advanced
15:45
BAndiT1983
You should try to load a DNG file in processing test
15:45
BAndiT1983
I deactivated DNG in ocbackup because of some tests
15:46
xeechou
It takes arguments?
15:46
xeechou
The program ProcessingTree?
15:46
BAndiT1983
No, all applications start without
15:47
BAndiT1983
But look into processing presenter class to see loading routines for images
15:50
xeechou
Yeah, from the output of program, it seems to try to load /media/Andi/OC_TEST_DISK2/darklab.mov
15:51
BAndiT1983
It is a test for video player in backup
15:51
BAndiT1983
Take processing test as base for now
15:52
BAndiT1983
Test files can be found here https://www.apertus.org/de/node/439
15:53
BAndiT1983
DNG are important for now
15:54
xeechou
Oh, btw, I cloned the main branch, I am not sure if we are talking about the same branch
15:55
BAndiT1983
Yes, Master was updated to the state of dev branch
15:55
BAndiT1983
I wasn't doing anything yet, as gsoc was approaching so I waited
16:01
xeechou
Okay, I need to leave a bit now, trying dng files before coming back
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BAndiT1983|away
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BAndiT1983
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Roopal08
Hey <BAndiT1983>, are you there ??
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se6astian|away
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se6astian
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23:01
aombk2
very nice team talk
23:14
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23:16
atoav
liked it too
23:17
RexOrCine[m]
Roopal08 - If you have specific questions the best idea is to ask them as the chat logs are routinely checked.
23:18
RexOrCine[m]
I'm sure Bandit would do his best to answer them when he comes online
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