Thank you Jason!!! Very useful.. I’m searching for a similar page for iPhones..in case you have it handy! :)
> On 11 Nov 2018, at 09:27, Jason Cowling <jasonwcowl...@gmail.com> wrote: > > Hi - documentation (images) of microphone locations here: > https://support.apple.com/en-us/HT201471 > <https://support.apple.com/en-us/HT201471> > <177F6616C5954E4485FE0F800CA87B80.png> > On Nov 10, 2018, 3:00 PM -0500, coreaudio-api-requ...@lists.apple.com, wrote: >> Send Coreaudio-api mailing list submissions to >> coreaudio-api@lists.apple.com >> >> 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 >> coreaudio-api-requ...@lists.apple.com >> >> You can reach the person managing the list at >> coreaudio-api-ow...@lists.apple.com >> >> 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 <d...@reyburn.com> >> To: CoreAudio <coreaudio-api@lists.apple.com> >> Subject: Re: iPad Pro 3 audio distortion? >> Message-ID: <a059ccbd-95ba-4ade-abb3-4158b3c08...@reyburn.com> >> 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 <arshiac...@antescofo.com> 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 <d...@reyburn.com> 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 >>>> d...@reyburn.com >>>> www.cybertuner.com >>>> _______________________________________________ >>>> Do not post admin requests to the list. They will be ignored. >>>> Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) >>>> Help/Unsubscribe/Update your Subscription: >>>> https://lists.apple.com/mailman/options/coreaudio-api/arshiacont%40antescofo.com >>>> >>>> This email sent to arshiac...@antescofo.com >>> >> >> 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 <arshiac...@antescofo.com> >> To: Dean Reyburn <d...@reyburn.com> >> Cc: CoreAudio <coreaudio-api@lists.apple.com> >> Subject: Re: iPad Pro 3 audio distortion? >> Message-ID: <189b1e89-0350-4c0e-b4eb-98a4cbce8...@antescofo.com> >> 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 <d...@reyburn.com> 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 <arshiac...@antescofo.com >>>> <mailto:arshiac...@antescofo.com>> 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 <d...@reyburn.com >>>>> <mailto:d...@reyburn.com>> 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 >>>>> d...@reyburn.com <mailto:d...@reyburn.com> >>>>> www.cybertuner.com >>>>> _______________________________________________ >>>>> Do not post admin requests to the list. They will be ignored. >>>>> Coreaudio-api mailing list (Coreaudio-api@lists.apple.com) >>>>> Help/Unsubscribe/Update your Subscription: >>>>> https://lists.apple.com/mailman/options/coreaudio-api/arshiacont%40antescofo.com >>>>> >>>>> This email sent to arshiac...@antescofo.com >>>> >>> >>> 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 >> Coreaudio-api@lists.apple.com >> 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 (Coreaudio-api@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/arshiacont%40antescofo.com > > This email sent to arshiac...@antescofo.com
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