[BC] Radio audio delay for TV

[Robert Meuser]

Trust me - delay in TV has been around a long time. Frame syncs, various effects 
boxes, etc etc.  That and the fact that the path is not constant. The program 
may pass though a number of control rooms depending on the phase of the overall 
show.

I once tested the delay of various video codecs well before the JJ incident (or 
9-11 for that matter). We used a direct off air feed from NY and a return feed 
from LA also off air but then back to NYC via the codec. Normally the results 
were predictable with LA being a bit more than 1 second behind NY. At certain 
times, we actually got LA BEFORE NY due to in plant delays.  This excludes the 
delays involved coming in from the remote. Being in the position to trace the 
delays, we discovered just how much the usual production equipment can delay a 
program. The production paths very often vary with sports broadcasts.

R

WFIFeng at aol.com wrote:
> In a message dated 06/01/2006 03:36:47 PM Eastern Daylight Time, 
> jerseyspikes at gmail.com writes:
> 
>> Some of that delay comes from the local affiliate in what they are doing in
>>  house, looping through coord rooms to do inserts/news promos, tossing 
> delays
>>  in the mix to correct lip sync issues in their plant, etc, and then of
>>  course the transmission path involved (digital STL/uplink = more delay).
> 
> Well, this all seems to have started after Janet's infamous "Wardrobe 
> Malfunction"... the radio & TV used to be within a fraction of a second of each 
> other, discernable only by hearing the sound of a crack of the bat, pop in a glove, 
> etc. Now, whether it's on YES, ESPN, or Channel 9 in NYC, that delay is 
> always approximately 10 seconds. It didn't use to be there. That's why I wonder if 
> it's deliberate.
> 
> The sync idea isn't to get them exact... I don't care if there's a second or 
> two, as long as the radio audio emerges AFTER the TV action, that's cool.
> 
> So... I'm still wondering if such a software app exists! I have a Ham DSP 
> program that yeilds about 1/2 sec delay, so I know it's possible!
> 
> Willie...
> 
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