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 protected]> 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 protected] >> <mailto:[email protected]>> 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 protected] >>> <mailto:[email protected]>> 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 protected] <mailto:[email protected]> >>> www.cybertuner.com >>> _______________________________________________ >>> Do not post admin requests to the list. They will be ignored. >>> Coreaudio-api mailing list ([email protected]) >>> Help/Unsubscribe/Update your Subscription: >>> https://lists.apple.com/mailman/options/coreaudio-api/arshiacont%40antescofo.com >>> >>> This email sent to [email protected] >> > > 1-888-SOFT-440 or 1-888-763-8440 > Reyburn CyberTuner, Inc. > http://www.cybertuner.com <http://www.cybertuner.com/>
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