[LAU] Level Matching

[Patrick Shirkey]

Paul Davis wrote:
> On Tue, 2008-11-04 at 14:08 +0700, Patrick Shirkey wrote:
>   
>> Paul Davis wrote:
>>     
>>> On Tue, 2008-11-04 at 11:25 +0700, Patrick Shirkey wrote:
>>>
>>>   
>>>       
>>>> Just out of interest how much processor power would it take to normalise 
>>>> on the fly?
>>>>     
>>>>         
>>> it doesn't need a CPU, it would need a time machine to travel into the
>>> future to measure the loudest sample still to come.
>>>
>>>
>>>   
>>>       
>> Even if we are talking about a static collection of audio files?
>>     
>
> that doesn't meet my understanding of the term "on the fly".
>
> look, normalization is a simple process: find the loudest sample. get
> the ratio of its value to the maximum possible sample value. multiply
> every sample by this ratio. done. no shortcuts, but also no complexity.
>
> what you seem to be after is a compressor, which will keep the level of
> the output within some defined range. entirely different beastie.
>   

Your right. I was looking at it from the wrong angle. I knew there was a 
well defined principal at use in the radio world.

So what the original poster wants is to add a compressor to the output 
path for amarok or whatever audio track player is being used... 
Jack-rack would probably do but surely someone has written a nice 
compressor interface for sc4 by now?

I looked into it once but didn't have time to finish.

I was thinking of ripping out the compressor code in jamin. Also the 
work that Jan did on the parametric eq would make a nice stand alone 
interface.




Cheers.

-- 
Patrick Shirkey
Boost Hardware Ltd.