Re: Audio cracks with the iPad 11"
Re: Audio cracks with the iPad 11"
- Subject: Re: Audio cracks with the iPad 11"
- From: Dean Reyburn <email@hidden>
- Date: Thu, 15 Nov 2018 10:35:46 -0500
A follow up:
My iPhone XS Av session has a sampleRate of 48khz, however this device records
with a lot of distortion at 48khz. At 44.1khz the iPhone records perfectly.
So I’m still searching for a way to determine a reliable distortion free
recording rate on all devices. For now I can use 48khz only with the “iPad8,x”
but that’s a hack and the wrong way to do this in the long run.
FWIW I’m using the play and record av session type.
-Dean
> On Nov 14, 2018, at 4:52 PM, Martin Man <email@hidden> wrote:
>
> Hi Dean,
>
> What’s the
> https://developer.apple.com/documentation/avfoundation/avaudiosession/1616499-samplerate?language=objc
>
> <https://developer.apple.com/documentation/avfoundation/avaudiosession/1616499-samplerate?language=objc>
> reporting back to you?
>
> Martin (still unable to test on 11”)
>
>
>> On 14 Nov 2018, at 14:24, Dean Reyburn <email@hidden
>> <mailto:email@hidden>> wrote:
>>
>> 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
>>> <mailto: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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>>
>> 1-888-SOFT-440 or 1-888-763-8440
>> Reyburn CyberTuner, Inc.
>> http://www.cybertuner.com <http://www.cybertuner.com/>
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1-888-SOFT-440 or 1-888-763-8440
Reyburn CyberTuner, Inc.
http://www.cybertuner.com
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