PCM + Dolby Digital + Volume + Lip sync issues
 

Has anyone noticed that channels that present in PCM require a different audio delay in the amplifier?

For example I have a Sony Amp and TV with Dolby Digital it needs 100ms delay to keep lips in sync. However it requires 130ms for anything produced in PCM. Now of course you would think why not set the TiVO to PCM only? Well this is great and solves lip sync issue, but you lose multi channel sound!

Another issue is the massive difference in volume between Dolby Digital and PCM channels. If I switch from a DD to a PCM I need to lower the volume a lot and increase a lot when going the other way!

My PS3 and Apple TV on the other hand only need a 70ms, both of course run dolby digital. So what gives? Is this something that a software update can fix?

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

I don't need to add any audio delay for Tivo. Using Yamaha amps. Bedroom one (RX-V1500) connected via optical and lounge one (RX-V1900) connected via HDMI.

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

At Home I use a Tivo using a Yamaha DSP Z7 no delay needs to be added. Work we have a Yamaha RX V671 and a Onkyo 606 with both types of Tivo and no delay needs to be added.

If you are experiencing this with your other equipment maybe its your combination of TV/Amp

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

You must be supersensitive to lip-sync, as that's less than one frame difference. Set it to 115ms as a compromise?

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

Both Yamaha amps, well I am not replacing my amp!

It does not allow in 5ms increments. Also it is easy to sync I have my tv and amp running at the same time and tweak until there is not echo. That way I get perfect sync and yes I am sensitive! But that is not the point, it is not a cheap or crappy amp, it was a highly rated mid range!

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

I'm super sensitive to it also, Infact Comedy Central HD sometimes makes me want to smash something up its so bad.

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

Flawed logic? Aren't you assuming the TV itself is perfectly synchronised?

Try turning off all picture enhancements in the TV and see if that improves things.

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

The TV is synchronised, I use visual and audio feedback to judge. I tuned on game mode and it did not help.

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

I had a Yamaha for 10 years until the front two channels died and that suffered from lipsync issues especially on Sky Movies HD. Bought a new Yamaha last week and it's fine now. Mind you - I do have the HDMI plugged into the Amp now rather than before, HDMI was into the TV and sound via optical.

Re: PCM + Dolby Digital + Volume + Lip sync issues
 

My bedroom setup is connected that way and no problems.