[Tig] OT-Audio levels for theatrical use from digital post

[Joe Beirne]

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>85 dB is the reference sound pressure level for Dolby theatrical
>presentation: the equivalent level on the Dolby processor itself is
>7.0.
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>Joe Beirne


Trailers per se need to adhere to a peak volume standard that is 
weighted for "annoyance" (were that this were a general standard!) 
called LEq which administered by an organization called TASA. This 
was established to avoid the problem of theatre managers pulling down 
overall program playback levels in response to patron complaints 
about overly-annoying theatrical trailer volume.

The peak annoyance standard happens to also be 85 "LEq" as measured 
by the Dolby 737.

Features are not measured by this standard.

Joe Beirne
New York


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>>
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>>I'm no expert in this area, but I was the post supervisor on a 
>>theatrical trailer and when we mixed it at a reputable audio house in 
>>LA the mixer kept referring to a specific audio number that was the 
>>peak "legal" limit. It was not a db level on his mixer but a separate 
>>numerical display (possibly a Dolby device). It's been about 5 years 
>>so I can't recall perfectly, but it seemed like he had to keep the 
>>level under "84" or something like that. Once again, I think there is 
>>a standard, but I'm not sure what the actual number is or what the 
>>reference is from.
>>
>>Steve Hullfish
>>Chicago/producer
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>>On Jun 18, 2007, at 11:25 AM, Ted Langdell wrote:
>>>
>>>   A gentleman in another forum is seeking info on whether there are
>>>   "standards he shouldn't be overlooking" when sending the audio he
>>   just finished posting for a feature length documentary.
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-- 
Joe