A good method to determine the overall perceived loudness is to sort the RMS energy values into numerical order, and then pick a value near the top of the list. For highly compressed pop music (e.g. Figure 7, where there are many values near the top), the choice makes little difference. For speech and classical music, the choice makes a huge difference. The value which most accurately matches human perception of perceived loudness is around 95%, so this value is used by Replay Gain.
Beatles tracks tend to sound much louder than other stuff in my collection after RG, so I normally bump them downward.
As far as I can see, proper solutions to this problem require human intervention*. So if you don't like the automated results, change the RG tags in your own files to give the loudness your ears think is correct.
How do I edit this? Who do I ask for permission?Cheers,David.
The problem at the moment is that the original ReplayGain website is out of date, and a defacto standard exists out there which is based on the original but with several important modifications and improvements. That's what needs to be set in stone here IMO.
Possibly it is a good idea to let (expert) users overwrite the 95% value at scan time in order to more reflect the character of audio under consideration. The following, including manual post-processing, is not uncommon:Quote from: greynol on 15 December, 2010, 07:54:41 PMBeatles tracks tend to sound much louder than other stuff in my collection after RG, so I normally bump them downward.
No - because you have to assume some listening level to use any psychoacoustics. Talking only about samples values in files with no real world reference is exactly how you create a dead-end standard which no one can ever improve.There is a major change to make though: what's stored is the 83dB referenced result, plus an arbitrary 6dB. That's a defacto change from the original proposal.Cheers,David.
I believe the +6 dB is correctly called out in section 3.2 (Pre-amp).
The text on replaygain.hydrogenaudio.com says 6 to 12 dB. I removed the 12 dB option in my early edits because I knew 6 dB was current practice.
I don't know if this is still a noticeable problem with the new remasters.
I will try to contribute, time allowing. Sadly it can't be top of my list. Well, not "sadly" - new house to get ready, new baby on the way, job, Christmas - all good!
If the replay gain is applied in the digital domain, bit transparency is lost. The original proposal included a short discussion of a digitally-controlled analog implementation. For some reason I had not carried that discussion over to the new revision. I have updated the new revision to include it. This demonstrates that a bit-transparent implementation is possible. I'm not aware of any such implementation, however.
I'm not aware of any such implementation, however.
Quote from: Notat on 17 December, 2010, 06:01:31 PMI'm not aware of any such implementation, however.I'd like to see a justification of such an implementation based on the results of blind tests with real-world examples.
Telling your amplifier to adjust the volume by a specific amount? I would certainly think so.EDIT: Noting your edit: sound quality. Back on the topic of difficulty in implementation, perhaps you can explain the mechanism by which this can be accomplished within the current framework of digital transmission. If it falls outside the current framework, please explain how you would get universal adoption and implementation.