Note here HDMI likes and uses LPCM. AC-3 is dolby digital. There needs te be a handshake and conversion, and their lies the problem.
http://en.wikipedia.org/wiki/HDMI
I suggested, and it has been brought to Verizon's attention is regards to the PCM, LPCM, and AC-3. And the Cisco not having the user adjustable hidden settings. They should be adjustable in the Settings under Audio, Auto, AC3, LPCM. Since they are not adjustable in a hidden menu with Cisco. But I believe the issues in HDMI is based on LPCM. I am not sure if this was posted as an idea for the Cisco hardware. But it is known that there is a hidden diagnostic menu on the Cisco, but no hidden user settings, such as found with the Motorola.
Interesting info RE: HDMI LPCM
http://en.wikipedia.org/wiki/Linear_pulse_code_mod​ulation
Interesting Info regarding AC3 and Dolby digital. Now it looks as if the conflict stands with the HDMI standard being LPCM, and some media standard being Dolby. How is the STB or TV supposed to handle that. I have heard some have used a fiber cable to resolve the issue.
Interesting info RE: Dolby AC3 and HDMI conflict. Handshake issues.
http://en.wikipedia.org/wiki/Dolby_AC-3
I will bring this up in the ideas section. It had been discussed previously, but now seems to have become a larger issue.
#1 Resolve sound issues with CIsco Hardware.
Just fix the img or HDMI firmware. If that can not solve the issue, than provide manual settings.
"Linear pulse-code modulation is used by HDMI (defined in 2002), a single-cable digital audio/video connector interface for transmitting uncompressed digital data."
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