On Sat, 30 Sep 2006 16:14:14 +0200, Raffaella Traniello
<[EMAIL PROTECTED]> wrote:
Hi all!
With the aim to set the correct range for fade keyframes in audio tracks
I'm now struggling with audio levels.
On Internet I learned that we can hear from silence (0 Db) up to over
140 Db (a bomb).
So why to set the automation range from -80 to 6? Are these number
referred to Db?
Yes, but they are not absolute levels, as that would not make sense.
They are relative levels, where 0 is "unity", the unaltered original
sound level. For digital sound that level is well defined if you don't
change the sampling format: Just pass the data through unchanged.
Faders' main purpose is to "fade out" sound to lower the sound level
smoothly to silence, or "fade in" to make sounds appear gradually
instead of suddenly. The faders need to be able to fade out the
sound completely for this purpose, and -80 dB seems about right,
although -96 might have been more appropriate for 16 bit sound.
(Someone mentioned the fader did not completely mute the sound at
the lowest level; that would be a bug!)
Some users have complained about the faders going above unity level
at all, since that makes them a little harder to use, especially with
keyframes. Or was that the video fader?
Fading and amplfication are typically separate knobs or levers:
the amplification setting is usually called "gain". Cinelerra has
a gain effect that you can attach to audio tracks. If Cinelerra
were an Audio Workstation, like Ardour, it would have had a gain
slider next to the fader.
--
Herman Robak
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