Klarinet Archive - Posting 000310.txt from 2009/01

From: Matt Reid <qmartialarts@-----.com>
Subj: Re: [kl] TV Audio-Video Synchronization
Date: Fri, 23 Jan 2009 09:02:37 -0500

Maybe this will explain it....

http://www.nytimes.com/2009/01/23/arts/music/23band.html?_r=1&hp

On Thu, Jan 22, 2009 at 12:29 PM, Tim Roberts <timr@-----.com> wrote:
> On Wed, 21 Jan 2009 18:06:47 -0500, Matt Reid <qmartialarts@-----.com>
> wrote:
>> Take this into account...
>>
>> The camera is probably not picking up the sound through the
>> microphone, and is probably farther away from the "action" than you
>> may think. ...
>> OR
>>
>> The camera is picking up the audio and video, and the audio is coming
>> from a public address system, and the camera is physically located far
>> beyond the throw of the speakers. ..
>
> I very seriously doubt that any of these synchronization issues came
> from the generating end. Television studios have spent VAST fortunes to
> ensure that audio and video are synchronized to within one video frame,
> and that they remain that way for weeks on end.
>
> The issue here is almost certainly at the receiving end -- at the
> television in your living room. We recently "upgraded" from an analog
> television to a fancy-dancy digital HD television. As someone who has
> spent 15 years writing operating system drivers for video capture cards,
> I find the delay issues fascinating. Standing in my kitchen, I can hear
> the new digital TV and one of our old analog TVs simultaneously, and the
> audio is as much as 1 or 2 full seconds apart. My kids play Guitar Hero
> and Rock Band, where you have to strum a guitar or hit a drum pad at
> exactly the right time, and the timing on the digital TV is vastly
> different from the old analog TV.
>
> I expected a certain amount of difference, because of the somewhat
> unpredictable delays in decoding the digital TV signal, but I'm shocked
> at just how much difference there is. I would expect the television
> networks to be up in arms about this. After all of the time and effort
> spent in getting audio and video in sync, now the individual TV
> manufacturers are screwing it up, with apparently no standards to fall
> back on.
>
> --
> Tim Roberts, timr@-----.com
> Providenza & Boekelheide, Inc.
>
>
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>

--
Matt Reid
Kendallville Computers, Inc.
260-347-5559

Check out our website for computers and for M&M Sound DJ Services!

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