Re: Coreaudio-api Digest, Vol 13, Issue 115
Re: Coreaudio-api Digest, Vol 13, Issue 115
- Subject: Re: Coreaudio-api Digest, Vol 13, Issue 115
- From: Jean-Charles Rousset <email@hidden>
- Date: Sun, 21 Aug 2016 21:57:25 +0200
Thanks for your reply Gordon.
What we have been trying to do is to RECORD sounds in iOS/macOS with our USB device as the master clock (TCXO) and iOS/macOS devices as the slave in order to get perfect samples.
If I have understood correctly :
- It cannot be achieved with ASYNC IN, as the sink (iOS) will be master.
- Of course, it cannot be achieved by SYNC mode.
- In ADAPTIVE mode, iOS should adapt its rate to what the USB device send.
Maybe I understood it wrongly, but then, I have no idea how to send audio to iOS with iOS being clock slave.
As I’m not recording audio for music but for timing measurement tool, I don’t need an ultra-high-quality audio. 16 bits / 48KHz is totally ok. But these 48KHz must be absolutely perfect (48.0000KHz..)
Thanks !
JC
> Le 21 août 2016 à 21:26, Gordon Rankin <email@hidden> a écrit :
>
> JC,
>
> Adaptive of course will add jitter to either the input or output device because of it's flow control being that of changing the Master Clock. Which in turn changes the speed of the clocked device (I2S, L/RJ whatever). Parts like the PCM2902 and really early TI parts were done (even early TAS1020 code) before anyone really could take a look the consequences of the protocols used.
>
> The XMOS software only works in ASYNC mode. You can use input, output both etc...
>
> Maybe a better approach maybe to tell us what you are trying to accomplish and maybe we could help you look for a better solution. Price or not, ASYNC or SYNC is a much better ADC way than Adaptive.
>
> Brian is correct on the Windows front, unless you are only trying to accomplish Full Speed UAC1 type products.
>
> Thanks,
>
> Gordon
>
>
> On 8/20/16 3:00 PM, email@hidden wrote:
>> Content-Type: text/plain; charset="utf-8"
>>
>> Brian, as I wrote in my email, I am not talking about asynchronous DAC which are, of course, the best solution for audio.
>> I am talking about ADC. Cheap or not, asynchronous mode in record is not clock master. Adaptive is.
>> I would love to get a high-quality chip that works but this is not the point. Xmos does not work either.
>> Thanks,
>>
>> JC
>
> --
> J. Gordon Rankin
> Owner and Chief Scientist
> ====== Wavelength Audio, ltd ======
>
> _______________________________________________
> 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
_______________________________________________
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