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 protected]> 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 protected] 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 protected]) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/rousset.jc%40gmail.com > > This email sent to [email protected] _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to [email protected]
