Don Pearce wrote:
On Mon, 10 Jul 2006 13:05:17 GMT, "dadiOH"
wrote:

Don Pearce wrote:
On Mon, 10 Jul 2006 11:10:55 GMT, "dadiOH"
wrote:

David Morgan (MAMS) wrote:

I had a look, and I can't see how the device works without
modifying dynamic range

Simply put...

1. Find max volume among all songs
2. "Turn up the volume" in all others so their max is the same as
the loudest.

Won't work - can't work. If you have a mixture of music, then peak
levels as related to average loudness will vary wildly. The loudest
sounding will have highly compressed dynamics, with most of the tune
crammed against the limit. If you try to increase the levels of all
the others until they sound as loud, they will all be clipped to
hell.

No, not necessarily *sound* as loud just increase the values in the
softer songs until the greatest is equal to the greatest in the
loudest song. For example...

Loud song greatest value = 29000

Song to be changed, greatest value = 24,500

(29000)-(24500) = 4500. Therefore, all values in this song are to be
increased by 4500 when played.

But what does that do? They are just numbers, and they have only the
most tangential relationship to the perceived playing of the track -
which is what this is all about.

The playing of the track involves (after decoding to wave) interpretation of
numbers - that's all a file is - in a meaningful way to produce the desired
sound; in this case, sound.

What the numbers do in this case is to tell the player to increase the
volume of each sound by a specific amount.
______________

Incidentally the maths is all off too. You can't do this by adding
numbers, you have to multiply.

No, one can certainly do binary addition.

Things may have changed but in the not too distant past there were no op
codes for multiplication. Doesn't matter one way or the other because
multiplication is nothing more than repetitive addition.


--

dadiOH
____________________________

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