[AudioI] Trouble with audio input on Octo

[Chris Fernandez]

Hi Matt,

The microphones I've been using do NOT have a preamplifier, as far as I can
tell. Here's a link to the microphones I bought, but I haven't been able to
find much technical documentation on them:
https://www.amazon.com/dp/B09CPWWVNM?psc=1&ref=ppx_yo2ov_dt_b_product_details

Would something like this require a preamplifier before it can connect to
the Octo?

With that said, I have also tried inputting audio from my phone to the
Octo, and still have not gotten any signal. I would think that even with a
very low amplitude signal, I'd see SOME kind of noise on the audio input if
it was configured correctly, rather than identical zero values every time.

     -Chris

On Tue, May 10, 2022 at 5:48 PM Matt Flax <matt at audioinjector.net> wrote:

> Hi Chris,
>
> It is possible that you aren't using microphone preamplifiers when
> plugging into the octo. Is the microphone a standard electret type of
> microphone which doesn't take batteries and needs the preamplifier embedded
> in the hardware it plugs into ?
>
> Is it possible to test with line level signals first ? This could be an
> output from your computer, phone, etc.
>
> Matt
> On 7/5/22 05:19, Chris Fernandez via People wrote:
>
> Hello,
>
> I'm having trouble getting any kind of audio input signal to the
> AudioInjector Octo.
>
> I have been able to get all 8 channels of audio output working just fine.
> I've been primarily using PureData, and I have been able to output .wav
> files and test sine wave patterns to each of the 8 channels independently
> and simultaneously.
>
> However, I have not been able to see any audio data at all on the input
> side. PureData has a diagnostic tool to help with this type of
> troubleshooting (Media -> Test Audio and MIDI...) but the only data I'm
> seeing are zeroes.
>
> For input, I have been using a set of cheap microphones I bought off
> Amazon that use a 3.5mm jack. I've confirmed that they are working by using
> them to record audio on my laptop via the Headphone/Mic combo jack. I
> thought that maybe these microphones need a preamplifier to work with the
> AudioInjector in order to get to line level. But, I have also tried routing
> the AudioInjector output back to the input, and still get nothing but zeros.
>
> This has me thinking that I must be doing something wrong from a software
> or configuration standpoint.
> -I have opened up the AlsaMixer and confirmed that all ADC channels are
> not muted and do not have the volume turned all the way down.
> -I've verified that my /etc/asound.conf and ~/.asoundrc both match the
> guidance listed in the readme at https://github.com/Audio-Injector/Octo
> -I've checked aplay -l and arecord -l, they both list the audioinjectoroc
> as a device.
>
> What other steps can I take to get audio inputs working on the Octo? Any
> help would be greatly appreciated!
>
>      -Chris
>
> --
> Chris Fernandez
> chris at hardline.io
> 518-242-6475
> Hardline, Inc.
> 112 South Park Street
> San Francisco, CA 94107
>
> --
> Checkout the community email list :https://lists.audioinjector.net/mailman/listinfo/people
>
>

-- 
Chris Fernandez
chris at hardline.io
518-242-6475
Hardline, Inc.
112 South Park Street
San Francisco, CA 94107
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