LURCH said:
I've been hearing about this legislation for some time, and I really have my doubts that it can make any real difference. The people recording the commercials don't know what levels the studios are using to record their programs, and certainly can't afford to record at different levels for each TV show during which their commercial might air. So, they will just record at the loudest level they can, to make sure their commercial is not quieter than the hsow.
Extremely unlikely. Sound editing/mixing is a technical and well developed profession and I find it incredulous that the advertisers and networks don't know exactly what they -and everyone else- are doing.
As mentioned, there is a set dynamic range that everyone has to work with, limited by the signal transmission. So the difference between the commercials and the programs would simply be that the sound levels of certain types of sounds are indexed to different parts of the range. Say, for example, a sound mixer for a tv show had three different sounds to mix: background music, speaking voices and an explosion. He's not lucky enough that they are already at the right sound levels when he mixes them together: he has to pick the levels as he mixes them. On a scale of one to ten, he mixes them at level 2, level 4 and level 8, respectively (made up numbers). He does this so that they sound natural to our ears -- and by the way, I don't notice differences between shows or between channels, so *somehow*, there is standardization in this. Whether that standardization comes from the show editors (say, a sound editor's handbook?), the tv network or the cable company, I don't know. Regardless, the advertiser (generally) has only background music and speech, so he indexes them to level 4 and level 8, respectively and so we get the commercial
actually being louder than similar parts of the TV show.
I've also noticed that movies usually have a wider dynamic range than tv shows and perhaps even action movies have wider ranges than rom-coms. This would be done on purpose, to optimize the sound for a louder playback device (my home theater, rather than the tv speakers). But if I'm not in my normal movie watching mode (say, if I'm in bed, watching on a little tv), I'll often manually compress the range, increasing the volume of soft talking and decreasing the volume of loud action. The physical range is the same, of course, but that just means they index the different types of sounds to different parts of the range in movies than for tv.
...and, of course, the explosion in the movie or action tv show is only momentary and most of the show is speaking, so you would want to compare averages, not peaks.