On 2015-05-16 9:33 AM, Mike Harris wrote: > It has so far been assumed that the KIO3B somehow has an analogue to > digital conversion function (sound card) feeding the USB interface.
Looking at the current K3 schematic, there is no *digital* connection between the DSP board and the KIO3. Since the KIO3B is a *replacement* for the current KIO3, I expect the USB sound function is nothing more than an off the shelf USB Audio CODEC chip (e.g. TI PCM-2902) fed from "Line Out" as is the case in the other rigs with USB Audio.
Looking at the K3 block diagram shows a mysterious KDV3 (Dig. Audio) within the DSB environment. KDV3 nomenclature would lead one to assume it was a module of some sort.
I doubt that the DSP engine has the horsepower to provide a separate isochronous USB audio stream (and identify as a USB CODEC) even if
there were a USB connection from the DSP board (via the RF board) to a USB hub on the KIO3B. 73, ... Joe, W4TV On 2015-05-16 9:33 AM, Mike Harris wrote:
It has so far been assumed that the KIO3B somehow has an analogue to digital conversion function (sound card) feeding the USB interface. Looking at the K3 block diagram shows a mysterious KDV3 (Dig. Audio) within the DSB environment. KDV3 nomenclature would lead one to assume it was a module of some sort. I've so far not been able to determine from the alphabet soup on the DSP board schematics where a KDV3 might interface with the DSP. This might offer a clue as to how the digital audio presented on the USB interface is derived. Sherwood has previously commented unfavourably on the audio quality of the LINE OUT signal. This has lead to the general acceptance that the LINE OUT level should be limited to 8-10. When the KIO3B module manual becomes available questions might be answered. Or maybe, someone in the know might offer enlightenment. Enquiring minds and all that. Regards, Mike VP8NO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
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