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: Arshia Cont <email@hidden>
- Date: Mon, 12 Nov 2018 21:42:55 +0100
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 <email@hidden> 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, email@hidden, wrote:
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>> 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:
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>>
>> 1-888-SOFT-440 or 1-888-763-8440
>> Reyburn CyberTuner, Inc.
>> http://www.cybertuner.com
>>
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>> ------------------------------
>>
>> 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/>
>>
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>> ------------------------------
>>
>> End of Coreaudio-api Digest, Vol 15, Issue 92
>> *********************************************
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