Hello, i know this is not an easy question but just in case there is someone out there with some experience with HDMI ARC.
I am thinking on building a multichannel HDMI to i2s audio extractor hat for raspberry pi. The idea is to capture multichannel audio from HDMI and send it to a raspberry pi 5, that has multichannel i2s input and output capabilities. Member @mdsimon2 has tested and confirmed it works:
audiosciencereview.com
I am going to use the HDMI transceiver IC from this multichannel HDMI extractor that i have:
This extractor uses a semicom EP92A3E chip that is ARC capable. The web page of the chip says:
However, the ARC pins of the chip are not connected and the ARC function in the extractor is not advertised and not functional.
My tv is a smart tv and i have all the services i need as built in apps, i would like to use its ARC HDMI to plug directly to the extractor without needing any other boxes. Unfortunately, i am not aware of other affordable HDMI multichannel extractors that are ARC capable.
What i would like to do, as i am going to transfer the chip from the extractor to the diy hat anyways, is try to activate the ARC function. From an schematic of a different device using this same chip i have this relevant section:
pins 117 and 118 (not connected in my extractor) seem to carry the ARC signal/code/whatever. and go to the HDMI output socket:
Now my question, for anyone that understands how ARC works, is:
Do you guys think that if i replicate these connections in my diy PCB i will have any chances of having the ARC function working, or it is not that easy? (note that there is no MCU in my circuit, the transceiver chip comes programmed from factory. It is unknown to me if it comes programmed with all its functionality by default)
If this is the case, why the people selling these extractors just don't do the same and have one more selling point?
I am aware of the answer "try and see", that is a fair one. The problem is that this is a project that will be time consuming and complex for me. If i know beforehand that the chances of having ARC working are very little or none, i will probably decide not to move forward and save a lot of time and effort.
thank you for any clue or direction where i can research more. When i type "how HDMI ARC works" in google, as you can imagine, i get hundreds of answers that have nothing to do with this.
I am thinking on building a multichannel HDMI to i2s audio extractor hat for raspberry pi. The idea is to capture multichannel audio from HDMI and send it to a raspberry pi 5, that has multichannel i2s input and output capabilities. Member @mdsimon2 has tested and confirmed it works:
Multichannel audio on a Pi will get a whole lot easier and cheaper!
I have to admit the multichannel I2S input is pretty cool and was much more plug and plug than I ever expected, although that is largely due to folks way more knowledgeable than me. I did some more testing today and really think an Apple TV + HDMI to I2S Extractor + RPi5 + CamillaDSP +...
audiosciencereview.com
I am going to use the HDMI transceiver IC from this multichannel HDMI extractor that i have:
This extractor uses a semicom EP92A3E chip that is ARC capable. The web page of the chip says:
However, the ARC pins of the chip are not connected and the ARC function in the extractor is not advertised and not functional.
My tv is a smart tv and i have all the services i need as built in apps, i would like to use its ARC HDMI to plug directly to the extractor without needing any other boxes. Unfortunately, i am not aware of other affordable HDMI multichannel extractors that are ARC capable.
What i would like to do, as i am going to transfer the chip from the extractor to the diy hat anyways, is try to activate the ARC function. From an schematic of a different device using this same chip i have this relevant section:
pins 117 and 118 (not connected in my extractor) seem to carry the ARC signal/code/whatever. and go to the HDMI output socket:
Now my question, for anyone that understands how ARC works, is:
Do you guys think that if i replicate these connections in my diy PCB i will have any chances of having the ARC function working, or it is not that easy? (note that there is no MCU in my circuit, the transceiver chip comes programmed from factory. It is unknown to me if it comes programmed with all its functionality by default)
If this is the case, why the people selling these extractors just don't do the same and have one more selling point?
I am aware of the answer "try and see", that is a fair one. The problem is that this is a project that will be time consuming and complex for me. If i know beforehand that the chances of having ARC working are very little or none, i will probably decide not to move forward and save a lot of time and effort.
thank you for any clue or direction where i can research more. When i type "how HDMI ARC works" in google, as you can imagine, i get hundreds of answers that have nothing to do with this.
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