[AudioI] Trouble with audio input on Octo

[Matt Flax]

Yes, it would need an electret microphone preamplifier before plugging into the Octo.

 

You can also try to use a cable to input the output audio from the Octo for testing.

 

Matt
 

 
On 13/5/22 01:15, Chris Fernandez wrote:
 
 
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 <mailto: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 <mailto:chris at hardline.io> 
 
518-242-6475
 
Hardline, Inc.
 
112 South Park Street
 
San Francisco, CA 94107
 
 
 
 
 
 

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

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