Re: iPad USB Audio Class 1 and Update on OSX Class 2
Re: iPad USB Audio Class 1 and Update on OSX Class 2
- Subject: Re: iPad USB Audio Class 1 and Update on OSX Class 2
- From: Gordon Rankin <email@hidden>
- Date: Tue, 13 Apr 2010 08:09:12 -0400
- Organization: Wavelength Audio, ltd.
Bill,
> Does class compliant USB Audio devices being supported imply being supported through the USB dongle from the iPad Camera Connection Kit? Because that would be just about perfect.
yes
Bill
Well this is really exciting! Just a couple of obvious questions....
1) Is this Full Speed or High Speed USB as the protocols are a little
different? With HS Class 1 you are still utilizing multiple microFrames
were as with Full Speed it is only a single frame per 1ms SOF.
2) Will standard Feature items like Volume and Mute be included?
3) I take it that developers with MFI will be able to make docks that
integrate the authentication and have USB Audio device I/O. Correct?
4) I take it that self powered Class 1 Audio devices could be connected
directly to the the Camera Connection Kit?
5) Would sample rates be limited to 32, 44.1, 48 @ 16 bits or would high
res devices to 24/96 (Class 1 top end) be supported?
Bill of course the first thing I did when I saw this was plug in my iPad
to a powered hub as the host and then put my Proton dac into one of the
available down ports and ran iTunes.... oh well no audio or stream.
Paul devices that require device drivers (i.e. M-Audio Transit) would
not be considered a Class 1 compliant device.
~~~~~~~~~~~
Class 2 USB Audio
In answer to Paul's questions... I have a number of USB Class 2 Audio
devices we are going to ship this month. There is a few things to
remember. Class 2 is really only supported under Snow. There will be an
updated AppleUSBAudio.kext to correct some minor problems with slower
machines.
Thanks
Gordon
--
J. Gordon Rankin
Owner and Chief Scientist
====== Wavelength Audio, ltd ======
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