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Old 29-03-2007, 10:30 AM   #8
Chris Moseley Chris Moseley is offline
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Re: Could someone please explain HDMI when it comes to Amps.

Quote:
Originally Posted by AntonioMS View Post
Have downloaded that pdf file which was linked through a previous thread which adds to the explanation and help you have provided.

Based on what I am learning...

a Question regarding ver 1.3:

Let us say we have a 1.3 amp along with the PS3 which is 1.3.
Let us say for argument's sake that the PJ is 1.2.

Therefore if I plug the PS3 into amp with HDMI and then HDMI to projector but have optical running also from PS3 to amp, would this enable 1.3 for audio but keeping 1.2 for picture or would the PJ cancel all out and relegate all to 1.2 thereby negating any need to wait for 1.3?

further to:

So, if I only have one output source of HDMI (i.e. the PS3) and connect it to the PJ for Hi Def image.

Would there be no difference in terms of sound if that is fed into the Amp via an Optical rather than HDMI?

Therefore if with only one HDMI source and the current absence of ver 1.3 I wouldn't get any difference in sound with either an amp that had HDMI sockets and one that didn't.

Would I still get uncompressed PCM via an optical cable or is that where the catch is? You have to have an amp with HDMI in order to hear that soundtrack... and hence why there is an argument that uncompressed PCM is so good, what difference is version 1.3 going to bring with HD audio when it is pretty amazing with this new enhancement. Is that it?

Am I learning correctly here?


Hi

Zerolight is correct.

Many members on this forum refer incorrectly to MPCM over HDMI as LPCM, which leads to confusion.

PCM is just a transfer method used for carrying digital audio. Several methods exist to carry PCM signals, including optical, coaxial, iLink and HDMI. However, PCM signals do differ. Whilst optical and coaxial can carry a two channel PCM signal (ie stereo), they can not handle multi channel PCM as HDMI can. Some HDMI repeaters can cope with 6 channel PCM, others 8 channel.

As for your question regarding having a 1.3 source, a 1.3 repeater and a 1.2 display. The audio repeater (if set to handle the audio) would not be affected by the display. However, if set to pass the audio on further (to the HDMI output) then as the screen would be connected to this output the HDMI connection between source and audio decoder would now be between the source and the screen and would therfore revert to v 1.2. This setting is usually selected in the menu of the product equipped with the HDMI repeater.

Regards

Chris Moseley
Yamaha UK
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