10-20-2007, 11:32 AM
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Member
Join Date: Feb 2001
Local Time: 02:31 AM
Local Date: 08-29-2008
Posts: 3,280
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Re: Is HDMI compatible with it's newer versions?
ok, the review doesn't give much detail.
HDMI Forum says this
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Q. Some cable TV set-top boxes with HDMI outputs don’t deliver a picture to displays with HDMI inputs. What is the problem, and is there a solution?
In some cases, the set-top box software does not activate or support the HDMI port. In other cases, cable TV set-top boxes don’t work correctly when used in conjunction with an A/V receiver (but will typically function correctly when connected directly to a TV or monitor). Investigation of some of these devices reveals that this is caused by an error in the way these set-top box devices implement HDCP. Specifically, some of those boxes do not support "HDCP repeaters" (devices that pass along the signal to another device) such as an A/V receiver or switch. We believe that this may be a problem in the initial versions of these products, and in some cases there is new firmware available that fixes this issue in HDMI (newer versions may already have this fix). We have been actively working with manufacturers to resolve these problems. We suggest that users contact their cable operator and request the new software to address these issues. As noted above, cable operators are increasingly downloading the available firmware upgrades required to fix this error.
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I think it's a specific model of Motorola cable boxes that is most susceptible to this problem.
edit:
seems as if it's common to many poorly implemented cable boxes
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The SA 8300HD DVR had this issue with my Yamaha RX-V2600 which has HDMI. As I recall the explaination I got when I tried this late last year, the 8300HD doesn't understand that the Yamaha is a repeater and so it complained about it. I don't remember the exact error. It wasn't too big a deal since my Sony SXRD HDTV has 2 HDMI inputs anyway.
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I have an almost identical problem. I bought a Denon 5805 and an Aquos 45" LCD and tried to use 2 set top boxes from Cox [my local cable company] one with a DVI output and a second one with HDMI output [Scientific Atlanta 8300HD with DVR].
I looked and asked everywhere, including Denon, Scientific Atlanta, Sharp, and my cable company, and nobody could give me a usable answer [blaming each other's implementation of HDMI]. I also read in an audio magazine that there are 3 versions of HDMI with serious incompatibilities with each other [yeah, very user-friendly those engineers must've been thinking!!!!]
Since the TV can display the video signal and play the audio signal from the cable box's HDMI output, it must be the Denon's switching circuit that's doing something wrong. I paid $$$ for HDMI switching and what I was sold is component switching. I'm thinking seriously of returning the Denon 5805, even if I were to regret that decision in the future.
Here's my experience:
(1) Like you stated, "component" switching works as advertised.
(2) Also, like you, I can connect the cable box's HDMI output to the Aquos HDMI input and get the expected awesome picture. And I get super audio in various stereo and surround formats when I use an optical cable to connect the cable box to the Denon.
(3) DVI Switching Does Not Work: Using the first cable HDTV box, I connected the DVI output port to the Denon's DVI input and connected the Denon's DVI output to the Aquos DVI input. No video came out of the Denon or the Aquos could not display the signal (couldn't tell which was the case, but as a user who cares?) I then tried the HDMI output from the Denon and hooked it to the HDMI input of the Aquos, again no success. I even tried to use a DV-HDMI converter and still no video was shown on the Aquos. In all 3 cases, I managed to get the audio using either an optical or a coax cable from the cable box into the Denon and on to the speakers.
(4) HDMI Switching Does Not Work: I gave up and got the latest box from my cable company which came with an HDMI output. Once again, I tried all possibilities, but no video came out of the Denon or the Aquos couldn't display such an output. The only improvement was that I managed to get audio out when I turned off the Aquos TV or the Denon or the cable box [yes, there was audio when I turned off the cable box: don't ask me how!]
Any help would be greatly appreciated, because that Denon is AWESOME and it would be a shame to return it.
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HDMI is already backwards compatible with DVI/HDCP (that's what my TV uses). The problem is that Scientific Atlanta has created a buggy implementation of HDMI. I have a second HDMI DVR, from Sony, which has zero trouble communicating with my DVI/HDCP TV or HDMI v1.1 switching receiver (and yes, the Sony DVR does require HDCP).
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Last edited by JeremyErwin : 10-20-2007 at 11:42 AM.
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