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Re: Audio cracks with the iPad 11"
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Re: Audio cracks with the iPad 11"


  • Subject: Re: Audio cracks with the iPad 11"
  • From: Dean Reyburn <email@hidden>
  • Date: Wed, 14 Nov 2018 08:24:39 -0500

Hi Pascal,
I have found a possible solution for my recording (only) app which was giving
distortion on iPad Pro gen 3 .  My older versions record only at 44.1khz. When
I change to 48khz the recording is perfect. Either sample rate works fine for
my app, but I simply need to know during intitialization which to use.

I’m still talking to Apple DTS about how to detect whether a device wants or
needs 44.1khz or 48khz. There are no error returned when an iPad Pro gen 3 from
AudioUnitSetProperty() or any other audio units call on iPad Pro 3 when
starting recording. The iPad Pro 3 accepts 44.1khz and confirms that it can do
this sample rate with AudioUnitGetProperty() even though the recording is
distorted.

So far I have not found how to detect the “default” or “native” recording
sample rate for a device if such a thing exists.

-Dean

> On Nov 14, 2018, at 5:02 AM, Flavio Antonioli <email@hidden> wrote:
>
> Pascal,
>
> we have also received reports from some of our users of audio distortion on
> the new iPad Pro. We too are using RemoteIO.
> We don't currently have a device to test with so I wasn't able to reproduce
> the issue.
>
> Flavio.
>
> On Tue, Nov 13, 2018 at 9:00 PM <email@hidden
> <mailto:email@hidden>> wrote:
> Message: 2
> Date: Tue, 13 Nov 2018 16:43:53 +0100
> From: Pascal Douillard <email@hidden
> <mailto:email@hidden>>
> To: email@hidden <mailto:email@hidden>
> Subject: Audio cracks with the iPad 11"
> Message-ID: <email@hidden
> <email@hidden">mailto:email@hidden>>
> Content-Type: text/plain; charset=utf-8
>
> Hi everyone,
>
> I have an audio app for iPad & iPhone and I have been getting audio cracks on
> the new iPad Pro 11”. The cracks happen on speakers and on headphones on the
> USB-C port but not when using bluetooth headphones like the Air Pods.
>
> They do not happen on any of the other iPads or iPhone.
>
> The audio engine is in C++ and is running in Core Audio using a single
> RemoteIO unit. No extra audio libraries are used.
>
> This is not related to the forced 48K sample rate of the iPad 11” as the app
> runs fine with the same sample rate on other devices.
>
> Anyone else has experienced the same? Thanks.
>
> Pascal
>
> ------------------------------
>
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>
> ------------------------------
>
> End of Coreaudio-api Digest, Vol 15, Issue 94
> *********************************************
>
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1-888-SOFT-440  or 1-888-763-8440
Reyburn CyberTuner, Inc.
http://www.cybertuner.com

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  • Follow-Ups:
    • Re: Audio cracks with the iPad 11"
      • From: Martin Man <email@hidden>
References: 
 >Re: Coreaudio-api Digest, Vol 15, Issue 94 (From: Flavio Antonioli <email@hidden>)

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