by Audio Dandy » Wed Jan 14 2015 13:11
by fm-maniac » Thu Jan 15 2015 10:28
by PatrickB » Thu Jan 15 2015 13:34
by fm-maniac » Fri Jan 16 2015 08:49
by PatrickB » Fri Jan 16 2015 19:26
Thanks for the interesting read. I wasn't aware of these possibilities.fm-maniac wrote:Patrick,
PS Audio for example offers I2S over HDMI inputs on it's DACs and equivalent outputs on it's transport. They in fact defined the "standard" for I2S over HDMI.
It's only the physical cable and connector used for signal transmission and has nothing to do with the embedded audio signal of the HDMI protocol. Instead a differental current signal is used for each I2S signal (SDA, LRCLK, BCLK, MCLK).
Other solutions are using Ethernet connectors and cables or BNC.
I took from the webpage of the thread starter that he's using Audio GD DACs from China. Audio GD is also offering I2S over HDMI modules.
The only problem with the RasPi is, that it doesn't provide a MCLK. So it needs some sort of clock recovery or upsampling on the DAC to get it running without it. The SABRE chips used by Audio GD as well as by many others perform such a clock recovery. So I'm pretty sure that this will work out of the box, as long as you connect the IIS signals from the RasPi's P5 connector in the right manner.
by Audio Dandy » Sat Jan 17 2015 08:30
by fm-maniac » Sat Jan 17 2015 13:49
by Audio Dandy » Thu Jan 22 2015 16:58
fm-maniac wrote:You need the USD20 I2S over HDMI board from audio GD:
Connecting this board to the Pi should be an easy job.
As I said Audio GD uses SABRE chips on most of it's products. So no Master clock is needed. BUT(!) the Master 7 you use has a PCM1704 DAC and I'm not sure if this works works without the master clock. Check the datasheet or ask Audio GB. They should know.
by NWTStuff » Thu Jan 22 2015 23:22
by fm-maniac » Fri Jan 23 2015 08:52