Re: free Orban loudness meter app now available

In article <48008557.271561968@[EMAIL PROTECTED]
>, 
nospam@[EMAIL PROTECTED]
 says...
>
>
>On Fri, 11 Apr 2008 11:33:40 -0800, Robert Orban
><donotreply@[EMAIL PROTECTED]
> wrote:
>
>>In article <48004342.189109968@[EMAIL PROTECTED]
>, 
>>nospam@[EMAIL PROTECTED]
 says...
>>>
>>>
>>>On Fri, 11 Apr 2008 06:52:15 -0400, "Arny Krueger" 
>><arnyk@[EMAIL PROTECTED]
>
>>>wrote:
>>>
>>>>"Robert Orban" <donotreply@[EMAIL PROTECTED]
> wrote in 
message
>>>>news:20080411-033616.328.0@[EMAIL PROTECTED]
>>west.giganews.com
>>>>
>>>>> The software accepts two-channel stereo inputs. The VU
>>>>> and PPM meters are split to indicate the left and right
>>>>> channels. The PPM meter also displays the instantaneous
>>>>> peak values of the L and R digital samples.
>>>>
>>>>When I started the program, the Vu and PPM meters started 
reading 
>>mid-scale 
>>>>and full-scale respectively, with no music playing. This seems 
>>>>counter-intuitive. 
>>>>
>>>
>>>Works as expected for me. my only issue is that the PPM isn't 
scaled
>>>as a normal PPM.
>>
>>I spent some time soul-searching about the issue of scales and 
finally 
>>chose to put all of the meters on identical scales to make it easier 
for 
>>users to compare the meters.  In future version, we may make 
scales a 
>>user-definable parameter.
>>
>>Bob Orban
>
>Can you explain a little more about the variable gain/sensitivity
>controls available for a couple of the scales? I'm not really too sure
>how one should be using those.

Because the scales are all -30 to 0 dBfs, setup is really somewhat 
arbitrary. If you set the VU Gain to +10 dB, the VU meter will indicate 
the same as the peak meter on a sinewave. (We sill probably change 
this is the next revision so that that this will happen with the VU Gain 
set to 0.)

As for the CBS loudness meter, there was never an "official" 
calibration published. As stated in the readme, if I want to compare it 
with the BS.1770 meter, I set the CBS gain to +7 dB if I want to 
compare the peak excursions of the meter wit BS.1770 and to +10 if I 
want to compare the experimental long-term CBS loudness to BS.1770.

>
>And apropos the PPM scales,  do remember that you need to 
provide IBU,
>BBC and Nordic scales at the very least.

The wonderful thing about "standards" is that there are so many of 
them :-(