or Connect
AVS › AVS Forum › Industry Area › HDMI Q&A - The One Connector World › New HDMI splitter causing signal delay
New Posts  All Forums:Forum Nav:

New HDMI splitter causing signal delay

post #1 of 8
Thread Starter 
I know a lot has been covered on this but I'm trying to sort out my ongoing problem. My current set up is
all HDMI cables Comcast HD cable --> Denon 1713 --> LU604M 1x2 splitter (Samsung 6000/Epson 8350)
The issue is when watching TV there is a 10 sec delay when switching channels with a no signal error message. After 10 sec everything is fine. When I bypass the splitter = no delay between channel changes.
Any thoughts or suggestions?
I would rather not keep plugging/unplugging HDMI cables to use TV/projector.
post #2 of 8
What happens if you bypass the AVR – Comcast > 1x2 DA > TV + Projector?

Power everything Off at the wall, make the connectivity changes then repower.

Joe
post #3 of 8
Unfortunately the AVR-1713 doesn't include upscaling. Otherwise I'd ask you to set it to only output 1080p.

After you are done with Joe's testing steps, can you set the Comcast HD source to only output 1080i or 720p. Basically set it so that it doesn't change resolution when you change channels. I'm wondering if the splitter is taking its time with the resolution changes?
post #4 of 8
Thread Starter 
Quote:
Originally Posted by alk3997 View Post

Unfortunately the AVR-1713 doesn't include upscaling. Otherwise I'd ask you to set it to only output 1080p.

After you are done with Joe's testing steps, can you set the Comcast HD source to only output 1080i or 720p. Basically set it so that it doesn't change resolution when you change channels. I'm wondering if the splitter is taking its time with the resolution changes?

thanks for the info. I was wondering about the 1713 and resolution settings. I completed Joe's tests and still have the delay. There is no delay from the Denon direct to the TV. Only when the splitter is used.
Could the splitter be bad or is it just the nature of the signal?
post #5 of 8
A little background on what is happening with the handshaking might help. When your TV is connected directly to the Denon, it sends a signal called an EDID that contains information about the sink (the TV) and what its capabilities are. This is then taken by the Denon, the information in the EDID is changed based on the Denon options that you selected and that modified EDID is passed to the source device. The source device then takes that information and generates an audio and video signal that is compatible with the information received from the sink (and modified by the Denon).

Now when you add the splitter after the Denon, the additional complication becomes that both sinks are sending separate EDIDs to the switcher. The switcher then has to either combine or choose one EDID to forward on. There is no standard way of doing this. So, every distributinon amp (splitter) can choose their own method. Just as long as the resulting EDID is valid and should include only capabilities that both sinks have the dist amp has met the HDMI spec. If only one sink has 3D, then the EDID sent back says that the displays are not 3D compatible because both do not have 3D capability.

So, the two possibilities I see is that the splitter is having problems reconsiling the two sinks or the Denon is having a problem handling the EDID that the splitter is creating and forwarding on. I suppose the other possibility is that this is just the way that particular splitter works. You haven't said if you tried to bypass the Denon with the splitter and what happens then. That could be a good clue.

But either way I suspect if this problem is bothering you, the best method to solve it would be to try a different splitter with different firmware. While on the topic of firmware, also make sure your TVs and the Denon have the latest firmware. It's usually impossible to update a distribution amp's firmware except for some that are in the $150+ range.
post #6 of 8
does your 1713 status info screen (under general) show any differences when the unit is hooked directly versus thru the splitter (after "appropriate plugging techniques")?
post #7 of 8
Quote:
Originally Posted by alk3997 View Post

...the splitter is having problems reconsiling the two sinks...
Not likely IMHO. At its most complex, it is essentially a process of logical anding two tables.
Quote:
...the Denon is having a problem handling the EDID that the splitter is creating...
Same thing.
Quote:
I suppose the other possibility is that this is just the way that particular splitter works
Again, not likely IMHO. These things are built on splitter chips from a handful of manufacturers, and there isn't a general problem with this.
Quote:
...the best method...would be to try a different splitter...
Always an option.

I am curious about cable lengths. Longer cables mean high capacitance, and high capacitance is known to cause problems with DDC.

FWIW cable boxes are notorious for bad implementations of HDMI, including not handling repeaters properly. Could simply be the cable box cannot handle two repeaters in-line (AVR and splitter). Could be the cable box is timing out before getting all the E-EDID blocks with the added delay of the splitter. Sounds to me like the cable box is retrying, then finally giving up after 10 seconds and outputting a default sigal.
Edited by Colm - 4/16/13 at 12:57pm
post #8 of 8
Interesting. Yes, I was thinking about a timeout when writing the above but lost my train of thought before I posted. I had not thought about a default signal though.

The long time really does lead one to suspect the firmware is looping for a while and then "giving up" or waiting a while and "giving up". The difference between looping for a while and waiting for a while is probably insignificant in this case. But since there is no real good way to fix the firmware in most of these little HDMI devices, I'd still stick with the suggestion to try another splitter and hope that the chipset manufacturer was different (not just the outer case).
New Posts  All Forums:Forum Nav:
  Return Home
AVS › AVS Forum › Industry Area › HDMI Q&A - The One Connector World › New HDMI splitter causing signal delay