[AudioI] Octo Glitches at 96 kHz
jr52884 at aim.com
jr52884 at aim.com
Thu Aug 24 02:22:11 UTC 2023
Hi Matt,
I have some examples of the audio input artifacts I was talking about when running the Octo at 96 kHz sampling rate. At 48 kHz sampling, these artifacts are not seen. Here are time domain plots of sine waves and an RC-shaped pulse.
As can be seen here, the artifact occurs at the peak and trough of this low frequency sine wave.
Here, the artifacting is seen as indicated by the arrows.
In this RC-shaped pulse, the artifacting is indicated by the arrows.
These artifacts are only seen at a 96 kHz sampling rate and not at 48 kHz. Could this be a clock issue? Driver issue? An issue with the CODEC? You can reproduce it by feeding in a test signal like a sine wave into the soundcard and looking at a time domain plot. Let me know if you see this behavior.
Thanks.
Jonathan
On Thursday, July 6, 2023, 10:33:01 AM EDT, jr52884--- via People <people at lists.audioinjector.net> wrote:
Hi Matt,
Any sort of aliasing or imaging artifacts that should not be present. Have you tested capture of more than two channels at 96 kHz? Any oddities in the noise floor at that sampling rate?
Thanks.
Jonathan
On Wednesday, July 5, 2023 at 05:35:09 PM EDT, Matt Flax <matt at audioinjector.net> wrote:
Not really sure - what type of artefacts ?
On 5/7/23 20:33, jr52884--- via People wrote:
> Matt,
>
> Can you comment on my question below?
>
> Thanks.
>
> Jonathan
>
> On Tuesday, May 30, 2023 at 01:38:31 PM EDT, jr52884 via People
> <people at lists.audioinjector.net> wrote:
>
>
> Did you ever run the audio input at 96 kHz sampling and ever run into
> any sort of issues or artifacts? One person I know had that issues
> with artifacts in the recorded audio at 96 kHz.
>
> Jonathan
>
>
> Sent from the all new AOL app for iOS
> <https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661>
>
> On Tuesday, May 30, 2023, 11:09 AM, Holguin Daniel via People
> <people at lists.audioinjector.net> wrote:
>
> Yes. It's unlike the usual, the opposite.
> Bottom red connectors are 1, 3, 5, 7 and top white connectors are
> 2, 4, 6, 8.
> I went through the same realization.
>
> El lunes, 29 de mayo de 2023, 09:12:31 p. m. GMT-5, jr52884 via
> People <people at lists.audioinjector.net> escribió:
>
>
> It looks like I might be wrong. Here are pictures of the output
> board, showing left channels as even numbered:
>
>
> Inline image
>
> Inline image
>
> From this in relation to the input board, 2, 4, and 6 are left
> channels and 1, 3, and 5 are right channels. Do I have this right?
>
> Thanks.
>
> Jonathan
>
>
> Sent from the all new AOL app for iOS
> <https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661>
>
> On Friday, April 14, 2023, 8:42 PM, jr52884 via People
> <people at lists.audioinjector.net> wrote:
>
> Hi David,
>
> I really appreciate this information! From what I gather, is
> this correct? I don’t have the RCA connectors anymore.
>
>
> Inline image
>
> Thanks!
>
> Jonathan
>
>
> Sent from the all new AOL app for iOS
> <https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661>
>
> On Friday, April 14, 2023, 2:08 AM, David Vanmanshoven via
> People <people at lists.audioinjector.net> wrote:
>
> Hi,
>
> I believe this is what you are looking for:
>
> Channel number Channel name Pin
> 0 ADC1 Left ADC_fb1- ADC_fb1+
> 1 ADC1 Right ADC_fb2- ADC_fb2+
> 2 ADC2 Left ADC_fb3- ADC_fb3+
> 3 ADC2 Right ADC_fb4- ADC_fb4+
> 4 ADC3 Left ADC_fb5- ADC_fb5+
> 5 ADC3 Right ADC_fb6- ADC_fb6+
>
> When you hold this input print in front of you with the
> cinch connector facing you and the PCB on the bottom, then:
> 0 bottom left
> 1 top left
> 2 bottom middle
> 3 top middle
> 4 bottom right
> 5 top right
>
> Kind regards,
>
> David
>
> -----Original Message-----
> From: People <people-bounces at lists.audioinjector.net> On
> Behalf Of people-request at lists.audioinjector.net
> Sent: donderdag 13 april 2023 11:36
> To: people at lists.audioinjector.net
> Subject: People Digest, Vol 37, Issue 2
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> 1. Octo Input Numbering (jr52884)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 13 Apr 2023 09:35:50 +0000 (UTC)
> From: jr52884 <jr52884 at aim.com>
> To: <people at lists.audioinjector.net>
> Subject: [AudioI] Octo Input Numbering
> Message-ID: <174651869.1512330.1681378550276 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Matt,
> Can you post the numbering of the channel inputs on the
> Octo? This would be channel 1-6 for how it?s reported in
> ALSA. Attached is a picture of the input board which I
> removed the RCA jacks. Which input is channel 1?
>
>
>
> Thanks.
> Jonathan
>
>
> Sent from the all new AOL app for iOS
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