How many independent SPDIF outputs in biphase encoding does ADV7612 have?
How many independent SPDIF inputs in biphase encoding does ADV7511 have?
In other words - how many SPDIF or AES/EBU Channel pairs in biphase encoding are supported in ADV7612 and ADV7511?
It's sort of a trick question. ADV7612 and ADV7511 just treat the audio bus as data to be serialized/deserialized and stuffed in the HDMI data islands-- they don't support anything more or less than the HDMI standard.
As far as I know, that is only a single input and output for SPDIF. You could run whatever you want through there though in I2S mode, if your system was closed and you knew what it was.
If I have 4 biphase encoded AES/EBU ( or SPDIF ) channel pairs coming from Audio Extractor / Disembedder part of a SDI deserializer and I need to build a SDI -> HDMI converter, then I expect to have 4 relevant inputs in ADV7511 not to lose data.
If ADV7511 has only one AES/EBU ( or SPDIF ) input, then the rest 3 audio channel pairs will be lost.
ADV7612 and ADV7511 both have support for 4 input lines supporting 8 channels of audio. You could still have 8 channels of audio on a single SPDIF.
SDI is not HDMI. Different standards, different modes of operation. You can easily send all the audio, but it would need to be reformatted in a way that makes sense for HDMI as part of your converter. 4 separate SPDIF signals with 2 channels each is not something people do with HDMI.
I'd decode your 4 SPDIF into PCM and then it's easy to send all of them over HDMI without losing anything.
To make me better understand Your previous answer, please answer the following question.
If to compare ADV7611 and ADV7612 in terms of available audio outputs, is it true, that ADV7611 is "less functional" than ADV7612 because ADV7611 has only 1 I2S /SPDIF output, while ADV7612 has 5 I2S /SPDIF outputs?
Does it mean, that ADV7611 will not be able to reproduce all possible audio from input HDMI stream, while ADV7612 will be able to do it?
If nevertheless ADV7611 will be able to reproduce all possible audio from input HDMI stream, than why does ADV7612 has 4 extra I2S /SPDIF outputs?
Yes, It means ADV7611 will only be able to output stereo audio or SPDIF because it doesn't have the pins so not all possible audio formats on HDMI can be done. The EDID would need to reflect this. ADV7610 would give you one input with all the audio pins though.
Let's assume that on my board there is ADV7612 with audio outputs connected to a custom schematic, that can only process SPDIF and cannot process I2S.
Then in this case I have to arrange that upstream HDMI transmitters are informed via EDID, that they have to supply only SPDIF in the HDMI stream?
What will happen if upstream HDMI transmitters cannot supply SPDIF, but can only supply I2S?
No audio at all will be transmitted from upstream HDMI transmitters?
Is it a common situation, that upstream HDMI transmitters ( HD sat receivers, HD media players, etc. ) can produce only one kind of audio ( SPDIF or I2S ) or they usually can produce both SPDIF and I2S?
>> Let's assume that on my board there is ADV7612 with audio outputs connected to a custom schematic, that can only process SPDIF and cannot process I2S.
I have to stop you right there-- HDMI requires that you at least process 32 Khz, 44.1Khz, or 48Khz Stereo PCM over I2S. You can't design a compliant system without supporting I2S. You could indicate in EDID that you ONLY support those. You would need to do this for ADV7611 or else you would risk confusion by the user as there is no way in the edid to specify you support more than 2 channels *if* the source uses SPDIF.
Most devices support both but don't automatically switch between them.
Basically the bottom line is this: If you use ADV7611, you should only be supporting Basic Audio (Stereo 48Khz). Nothing stopping you from doing more, but you have no way to guarantee it'll work automatically.
With ADV7612 or ADV7610, you do not have this limitation.Dave
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