Dump everything you know about HDMI eARC here

[djtwxj]

thanks
it not identify support dolby atmos

check this one, support dolby atmos

https://www.aliexpress.com/item/1005008762182617.html

 

[MCH]

thanks
it not identify support dolby atmos

check this one, support dolby atmos

https://www.aliexpress.com/item/1005008762182617.html

Thanks for sharing. If you buy one, would you mind posting pictures of the insides?
Thanks

 

[stigger]

From the link above:

The Navceker HDMI-compatible Switch supports LPCM 7.1CH, Dolby True-HD, DTS-HD, AC 3, DTS, DSD, Dolby Digital Plus, and Dolby Atmos audio formats, but cannot decode these audio formats

So unless I'm missing something, it won't give any benefits over the extractor mentioned in the first post.

 

[djtwxj]

What's the audio format from I2S?

the HDMI input audio format is dolby truehd + atmos + mat
the i2s audio format is also dolby truehd + atmos +mat , if so how to remove mat and get dolby truehd + atmos
or dolby truehd + atmos , if so we can decode it to pcm 9.1.6
or dolby truehd , if so can only decode to 7.1

 

[djtwxj]

can help record samples from the i2s port with hdmi in dobly atmos audio format?

 

[phofman]

IIUC an eARC -> I2S extractor capable of all formats would require an 8ch I2S (just like the eARC extractor in RK3588 SoC). Then it's up to the I2S receiver how it treats the incoming data streams. The transmission could be TDM too (i.e. bit clock running at 8ch * 192kHz * 24bits = 36.864 MHz = maximum eARC bitrate of 37Mbps).

 

[djtwxj]

The bitstream audio from HDMI in i think is not 8 ch, it should be 2 ch with dolby truehd atmos with mat?

 

[phofman]

PCM/LPCM has channels. Non-PCM streams are just bitstreams (which yield channels after decoding to PCM) which need to be stuffed somehow into the channel-oriented transmission links.

Look at this nice eARC description for eARC transmitter/receiver chips SiI9438/SiI9437 https://www.digikey.pl/Site/Global/...nfRfVFOwB8POxLizNVoEQqvsGZrDlyLu_j9637GTFlV-S and their data brief https://www.latticesemi.com/-/media...aSheets/SiI-DB-02013-B.ashx?document_id=52242 - the I/O interfaces are 4-lane (= 8ch) I2S.

 

[djtwxj]

No, not disconnecting anything, I even left the resistors in place and simply soldered the wires to them.

Hi, would u mind upload some pictures of your setup of the two boards?

 

[stigger]

Hi, would u mind upload some pictures of your setup of the two boards?

Sorry, I didn't make any photos back then, and now everything's assembled, so there is not much to see. But connecting the lanes is quite straightforward, as long as you have a datasheet for one of the chips (was linked somewhere in this thread) and a digital multimeter to test the connections.