Re: Coreaudio-api Digest, Vol 15, Issue 9 - microphone locations
Re: Coreaudio-api Digest, Vol 15, Issue 9 - microphone locations
- Subject: Re: Coreaudio-api Digest, Vol 15, Issue 9 - microphone locations
- From: Jason Cowling <email@hidden>
- Date: Sun, 11 Nov 2018 03:27:41 -0500
On Nov 10, 2018, 3:00 PM -0500, email@hidden, wrote:
Send Coreaudio-api mailing list submissions to
email@hidden
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.apple.com/mailman/listinfo/coreaudio-api
or, via email, send a message with subject or body 'help' to
email@hidden
You can reach the person managing the list at
email@hidden
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Coreaudio-api digest..."
Today's Topics:
1. Re: iPad Pro 3 audio distortion? (Dean Reyburn)
2. Re: iPad Pro 3 audio distortion? (Arshia Cont)
----------------------------------------------------------------------
Message: 1
Date: Fri, 09 Nov 2018 15:18:16 -0500
From: Dean Reyburn <email@hidden>
To: CoreAudio <email@hidden>
Subject: Re: iPad Pro 3 audio distortion?
Message-ID: <email@hidden>
Content-Type: text/plain; charset="utf-8"
Hi Arshia,
I’m using AVAudioSessionCategoryPlayAndRecord but maybe I should use AVAudioSessionCategoryRecord since my app does not itself do any playback. I do wish to let the user listen to background music on headphones if they wish.
Apple is suggesting I try the .measurement or AVAudioSessionModeMeasurement setting. Need to test that.
I use AudioUnits, the lowest level audio input possible.
Sorry I don’t know where all the mics are, I could only find four of them, three on the front, one on the back. My app only wants to use one mic.
-Dean Reyburn
On Nov 9, 2018, at 11:36 AM, Arshia Cont <email@hidden> wrote:
Hi Dean,
What AVAudioSession Category/Mode are you using? Beyond this, you should probably tell us how you record (AVAudioEngine? AUnit?).. My first suggestion si to check the Stream format of your audio chain with that provided by the system (such as sample rate etc.).
Do you mind sharing the positions of the 5 microphones?! Time to buy one of those I guess! :)
Arshia
On 9 Nov 2018, at 17:29, Dean Reyburn <email@hidden> wrote:
Hi all,
My app, CyberTuner does low level audio recording and custom DSP, then displays the results in a way useful to pro piano tuners. On iPad Pro generation 3 which was just released on Nov. 7th, the audio appears to be distorted. This is the first time I’ve ever seen any general recording issues with iOS devices.
There are five (!!) microphones on these new devices so I suspect that fact has something to do with the problem. Any suggestions or anyone else see issues with the new iPads?
My app simply uses the default microphone.
Thanks in advance,
-Dean Reyburn
email@hidden
www.cybertuner.com
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
1-888-SOFT-440 or 1-888-763-8440
Reyburn CyberTuner, Inc.
http://www.cybertuner.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.apple.com/mailman/private/coreaudio-api/attachments/20181109/c14a5da8/attachment.html>
------------------------------
Message: 2
Date: Fri, 09 Nov 2018 21:36:31 +0100
From: Arshia Cont <email@hidden>
To: Dean Reyburn <email@hidden>
Cc: CoreAudio <email@hidden>
Subject: Re: iPad Pro 3 audio distortion?
Message-ID: <email@hidden>
Content-Type: text/plain; charset="utf-8"
It all depends on the type of live processing you employ with AudioUnits! You would want to use Measurement Mode if you want low latency by lowering the AVAudioSession’s Buffer Duration. Note that Measurement mode will remove AGC and Equalisation to achieve low-latency. So if you record audio, you need to take that into account.
I would also recommend double checking all the Stream Formats in your AudioUnit chain.
If you are getting continuous glitches it might be that your custom DSP is not delivering before the main audio thread cycle. But I’d be surprised if that’s the case since “iPad Pro 3rd gen” should naturally improve performance with regards to prior devices I would assume!
On 9 Nov 2018, at 21:18, Dean Reyburn <email@hidden> wrote:
Hi Arshia,
I’m using AVAudioSessionCategoryPlayAndRecord but maybe I should use AVAudioSessionCategoryRecord since my app does not itself do any playback. I do wish to let the user listen to background music on headphones if they wish.
Apple is suggesting I try the .measurement or AVAudioSessionModeMeasurement setting. Need to test that.
I use AudioUnits, the lowest level audio input possible.
Sorry I don’t know where all the mics are, I could only find four of them, three on the front, one on the back. My app only wants to use one mic.
-Dean Reyburn
On Nov 9, 2018, at 11:36 AM, Arshia Cont <email@hidden <mailto:email@hidden>> wrote:
Hi Dean,
What AVAudioSession Category/Mode are you using? Beyond this, you should probably tell us how you record (AVAudioEngine? AUnit?).. My first suggestion si to check the Stream format of your audio chain with that provided by the system (such as sample rate etc.).
Do you mind sharing the positions of the 5 microphones?! Time to buy one of those I guess! :)
Arshia
On 9 Nov 2018, at 17:29, Dean Reyburn <email@hidden <mailto:email@hidden>> wrote:
Hi all,
My app, CyberTuner does low level audio recording and custom DSP, then displays the results in a way useful to pro piano tuners. On iPad Pro generation 3 which was just released on Nov. 7th, the audio appears to be distorted. This is the first time I’ve ever seen any general recording issues with iOS devices.
There are five (!!) microphones on these new devices so I suspect that fact has something to do with the problem. Any suggestions or anyone else see issues with the new iPads?
My app simply uses the default microphone.
Thanks in advance,
-Dean Reyburn
email@hidden <mailto:email@hidden>
www.cybertuner.com
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
1-888-SOFT-440 or 1-888-763-8440
Reyburn CyberTuner, Inc.
http://www.cybertuner.com <http://www.cybertuner.com/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.apple.com/mailman/private/coreaudio-api/attachments/20181109/52a5625c/attachment.html>
------------------------------
Subject: Digest Footer
_______________________________________________
Coreaudio-api mailing list
email@hidden
https://lists.apple.com/mailman/listinfo/coreaudio-api
------------------------------
End of Coreaudio-api Digest, Vol 15, Issue 92
*********************************************
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden