I've been locked up for a while so the whole Raspberry Pi world is new to me but I just found this online and was super excited Raspberry Pi Expansion Board till I noticed everyone seems to be out of stock. Anybody know where I can find one?
Yes it does, thank you. Not sure how much it costs to ship to the states, though. Whoa, I just realized my account says I'm in Israel. I'll have to figure out how to change that. I've actually been using this site since 2003 or so, but I lost my log in information and my old email address, so I look like a newbie.
Just noticed this post. there are apparently two different versions of the X6000 that look the same. One is 7.1 out or 8 channel out , the other is 4 x 2 Ch out.
IIUC the 4 x 2ch should generate 4 stereo alsa devices which can be merged to a single 8ch device by the route plugin. Timing should be synchronous, it's one serial data channel. But there can be a slight delay between each pair, maybe.
From what I understand, whatever is interfacing with HDMI on the HAT exposes only 2 channels of audio. These are then "copied" to the four onboard DACs. Sorry that this is a very naive understanding of the hardware, but this is why, as I understand it, you can only access two channels with this version of the board. I was never clear why the designer made it that way and what the intended use was supposed to be.
That would be a very stupid design, why wasting the extra 3 stereo dacs?
I know next to nothing about HDMI, but the EP91A6SX HDMI repeater supports HDMI 2.0 which in turn supports up to 4 audio streams. Perhaps the chip in the 4x2 version is configured to announce to support 4 stereo streams instead of one 8ch stream. RPi4 has HDMI2.0 outputs, maybe its VC4 firmware can support the 4x2 configuration via 4 alsa devices. Perhaps RPi developers at Raspberry Pi Forums - Index page would know more, HDMI is a proprietary technology with no official documentation online. Also the seller should know more (theoretically ).
I know next to nothing about HDMI, but the EP91A6SX HDMI repeater supports HDMI 2.0 which in turn supports up to 4 audio streams. Perhaps the chip in the 4x2 version is configured to announce to support 4 stereo streams instead of one 8ch stream. RPi4 has HDMI2.0 outputs, maybe its VC4 firmware can support the 4x2 configuration via 4 alsa devices. Perhaps RPi developers at Raspberry Pi Forums - Index page would know more, HDMI is a proprietary technology with no official documentation online. Also the seller should know more (theoretically ).
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