General > General Technical Chat

Why do commercials sound so blasted loud?

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Zero999:
I would have thought the solution would be obvious. Measure the RMS value of the signal and dial back the gain, if it's too high. Note a normal audio limiting circuit won't work very well because it uses the peak amplitude, when the RMS is more important here.

Terry Bites:
Its that area under the curve stuff again. There used to be a block of pixels (top left) on UK TV just before an ad. There was a project I saw back in the stone age that let you use this block to mute the TV. Now you need AI.

nctnico:

--- Quote from: Terry Bites on November 24, 2021, 04:59:58 pm ---Its that area under the curve stuff again. There used to be a block of pixels (top left) on UK TV just before an ad. There was a project I saw back in the stone age that let you use this block to mute the TV. Now you need AI.

--- End quote ---
Not really... first hit from Google https://blog.gdeltproject.org/using-ffmpegs-blackdetect-filter-to-identify-commercial-blocks/

ejeffrey:

--- Quote from: EPAIII on November 24, 2021, 10:29:05 am ---Compression is the cause of the problem. It is going to be hard to use it as a cure.




--- Quote from: ejeffrey on November 19, 2021, 01:59:33 am ---Many AV receivers have adjustable dynamic range compression for exactly that reason.

--- End quote ---

--- End quote ---

That's not what I was responding to.  I was talking about movies with extremely high dynamic range where a little bit of compression can make it more listenable.

james_s:

--- Quote from: ejeffrey on November 24, 2021, 05:51:02 pm ---
--- Quote from: EPAIII on November 24, 2021, 10:29:05 am ---Compression is the cause of the problem. It is going to be hard to use it as a cure.




--- Quote from: ejeffrey on November 19, 2021, 01:59:33 am ---Many AV receivers have adjustable dynamic range compression for exactly that reason.

--- End quote ---

--- End quote ---

That's not what I was responding to.  I was talking about movies with extremely high dynamic range where a little bit of compression can make it more listenable.

--- End quote ---

That's precisely what the adjustable compression on the receivers he's talking about is there to help with.

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