HDMI audio problem (high-pass filter?!)

[#1]

Hello everyone! It's me again.

I found a problem with my phone. I have a hi-fi system and Sony's receiver at home. When I connected the phone to listen for some music, I instantly noticed that the sound is seriously lacking in low frequencies.

It sounds like a high-pass filter was applied. The cut-off frequency seems to be around 100 hz or so. To me it looks like when you connect the phone through HDMI, the sound which is meant to be for the phone's external speaker (which includes a high-pass filter for obvious reasons), is simply rerouted to the hdmi connection. Or something like that. Anyway this connection becomes useless for any media but puctures.

I do hope this is some kind of software problem and could be fixed in future updates! Is there any way to workaround this issue?

Thanks!

[Johan]

I have not been listening that carefully to songs over HDMI from the phone so I can't tell but I will try to find out if your theory is true or not.

I'll be back.

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[#3]

Thank you for the answer and for the launched investigation!

[pixate]

I discovered this last night, and can confirm that there is some significant equalisation going on with audio over hdmi.

It's like you say some sort of high pass filter, cutting most of the bass frequencies. Not sure on the reasoning for this as most devices with a hdmi input can handle full range signal, in fact I can't think of one situation where this would be necessary, so can assume it's a fault.

It doesn't seem to do this over any other outputs (DLNA and headphone jack).

[Johan · Accepted solution]

This will be fixed in the ICS update for the phone.

[#6]

Those are great news! Thank you very much Johan! One more reason to wait for ICS