HDMI to I2S

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This is not "Real HDMI->I2S" receiver (extractor), just LVDS-TTL interface.
There are less expensive modules: https://vi.aliexpress.com/item/1005003316456642.html?gatewayAdapt=glo2vnm
For both sides (LVDS->TTL, TTL-LVDS, receiver/transmitter).
Yes, It's not HDMI, It's i2s over HDMI connection (connectors and cable).
I had that one also (still have it) and tried it first, I found the CDES one a bit better, cleaner.

But as you say it is cheaper so if it suits someones budget better that's great advice.
 
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Below installed close to Najda DSP XO using short wires, digital earth for each of Data, Frame and Clock.
The wiring clump to the right was the quickest way to get 3 gnd to one for the CDES board.
The loop on Najda is too activate the Expansion port as input.
The brown wire is +5v from Najda.
The black flying wire is 5v and.
The grey wire is MCLK from CDES to Nadja.

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