[access-uk] Re: CDEX and normalising
- From: "Andy Collins" <andy@xxxxxxxxxxxxxxxxxxx>
- To: <access-uk@xxxxxxxxxxxxx>
- Date: Mon, 10 Mar 2008 16:50:34 -0000
Actually, for some of us, it can remain pretty impossible to understand even
with a lot of effort, our skills and talents can lie elsewhere, that's why
so many of us are grateful for these lists and people such as yourself being
subscribed -
Andy
----- Original Message -----
From: "Tristram Llewellyn" <tristram.llewellyn@xxxxxxxxxxxxxxxxxxx>
To: <access-uk@xxxxxxxxxxxxx>
Sent: Monday, March 10, 2008 4:38 PM
Subject: [access-uk] Re: CDEX and normalising
| "I wish I could get my head round some of this stuff the way some of you
| guys can."
|
| It helps if you have emerged from some kind of technical background in
| audio which at least for some portion of my life past and present I
| have, but it is not impossible to undertstand with some effort.
|
|
| Regards.
|
| Tristram Llewellyn
| tristram.llewellyn@xxxxxxxxxxxxxxxxxxx
| Technical Support
| Sight and Sound Technology
|
| -----Original Message-----
| From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf
| Of Andy Collins
| Sent: Monday, March 10, 2008 3:31 PM
| To: access-uk@xxxxxxxxxxxxx
| Subject: [access-uk] Re: CDEX and normalising
|
| Tristram, I was hoping for a more thorough explanation than this :] I
| wish I
| could get my head round some of this stuff the way some of you guys can.
|
| Thanks for the explanation, I always try to achieve the best sound
| [subjective I know] but because I have some high frequency deafness, I
| can't
| trust my ears to know what others hear that I do not! -
|
| Andy
| ----- Original Message -----
| From: "Tristram Llewellyn" <tristram.llewellyn@xxxxxxxxxxxxxxxxxxx>
| To: <access-uk@xxxxxxxxxxxxx>
| Sent: Monday, March 10, 2008 2:45 PM
| Subject: [access-uk] Re: CDEX and normalising
|
|
|| The term "normalisation" when used in its proper sense has nothing to
| do
|| with making music tracks apparantly have the same volume level. I am
|| not sure how CDEX implements the feature you speak of, I haven't used
| it
|| for a few years now.
||
|| The process of normalisation is used in order to optomise the apparant
|| level of audio to the maximum extent allowed by whatever bit depth 16
| or
|| 24bits of the digital audio path. What normalisation generally does
| is
|| look for the loudest parts of audio material and arrange things so
| that
|| those land at the top or near to the top of the 16bit audio range
|| without causing digital clipping. There are two types of
| normalisation
|| and one thus described is peak level normalisation which is perhaps
| the
|| most common. Normalisation is desirable because it helps maximise the
|| maximum dynamic range possible whilst reducing to a minium
| quantisation
|| errors at low level.
||
|| However the problem may be that you can normalise two tracks so they
|| peak at the same level but the apparant volume still seems to be
|| different because of the differences in the material which mean that
| the
|| average level of the sound of one of the tracks is higher. It is most
|| likely that the one with the higher average level will be determined
| by
|| the human listener as the loudest. This can also be made to happen
|| artificially during TV ad breaks and you find yourself wanting to turn
|| down the sound. In order to catch our attention commercials heavy
| heavy
|| audio compression applied to the sound to reduce the size of audio
| peaks
|| and turning up the makeup gain for the lower level signal so that the
|| average level becomes higher whilst the differences between the
| highest
|| level of sound and lowest is less, result, something that sounds
| louder
|| and more exciting.
||
|| In such cases as yours would would either need the help of software or
|| use your own ears to compare two or more audio programs and even out
| the
|| difference beween them as an average level because most likely the
|| normalisation process will not help. Also if you are sourcing from
|| commercial CDs this process will have already taken place. A breed of
|| individual in the audio industry known as a mastering engineer will be
|| making sure that all the tracks of an album sound like they fit
| together
|| and make sure the levels appear to the human listener to be roughly
| the
|| same. There are all sorts of other things they do to given an abum
| its
|| sound if that is the kind of project they are working on. I know
| iTunes
|| certainly a facility called sound check which evens out levels between
|| tracks in your music library but I don't it does it particularly well
|| come to think of it.
||
|| To add further fuel to the fire the human ear is not completely linear
|| therefore what a machine or software "hears" (I used the term
| advisedly
|| here) may not be what a human perceives. The vast majority of all the
|| acoustic energy in most pop music certainly is contained in the lower
|| end of the spectrum, thus a regeah track may sound about the same
| level
|| as something mush less bassy but the former still has more acoustic
|| energy in it whilst still sounding quieter and register a higher audio
|| level (as measured).
||
|| Hope this helps.
||
|| Regards.
||
|| Tristram Llewellyn
|| tristram.llewellyn@xxxxxxxxxxxxxxxxxxx
|| Technical Support
|| Sight and Sound Technology
||
|| -----Original Message-----
|| From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On
| Behalf
|| Of Andy Collins
|| Sent: Monday, March 10, 2008 11:15 AM
|| To: access-uk@xxxxxxxxxxxxx
|| Subject: [access-uk] CDEX and normalising
||
|| Hi all
||
|| Within CDEX settings, are tabs for normalisation, will this just make
|| all
|| tracks have the same volume, in other words, when ripping tracks, does
|| it
|| equalise the volume so that some tracks are not louder or quieter than
|| others? Am I right in thinking it doesn't affect the sound quality?
||
|| Thanks -
||
|| Andy
||
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