Electronics > Projects, Designs, and Technical Stuff
Making a HDMI audio type detector
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teddyng:

--- Quote from: Yansi on November 12, 2019, 04:38:45 pm ---HDMI sink signals it's supported formats to the HDMI source using the DDC/EDID, using SAD (short audio descriptors).

Can somebody fill in my gap in knowledge, how the HDMI sink then determines in what format is the audio data received?

(That will also probably be the partial answer for the OP how to grasp the problem)

Usually, HDMI receiver codec just provides a multichannel raw audio data (4x I2S or TDM), that then gets interpreted by the decoder. Question is, how the decoder decides, whether it is receiving raw LPCM, or compressed garbage?

Thx, Y.

--- End quote ---

I will probably do some sink simulation to find out the handshake process if any.

Thanks for all the info so far, I will do a bit more research and I also have access to a few quantumdata analysers so I can double check where the audio signal is being send and look at the EDID and infoframes, I will keep you guys updated. The main problem might be building a circuit with their proprietary chipset as Yansi mentioned which the datasheet or where I can get hold of them. I might buy a "HDMI Audio Extractor" from Amazon which might have a "smart" decoder chipset that also process the EDID/infoframes, but it might have a "dumb" chip/chipset that just pull the audio out without the handshake.
NiHaoMike:

--- Quote from: teddyng on November 13, 2019, 10:38:10 am ---That's what I am doing at the moment with a receiver, but I am trying to build a portable one.

--- End quote ---
Find a used receiver with a blown PSU or output stage, then scavenge the HDMI board and display?
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