Re: free Orban loudness meter app now available

In article 
<XMCdnWyUJZIDiZzVnZ2dnUVZ_qelnZ2d@[EMAIL PROTECTED]
>, 
arnyk@[EMAIL PROTECTED]
 says...
>
>
>"Robert Orban" <donotreply@[EMAIL PROTECTED]
> wrote in message
>news:20080412-194627.828.0@[EMAIL PROTECTED]
>> In article <20080412-063035.375.0@[EMAIL PROTECTED]
>> west.giganews.com>, donotreply@[EMAIL PROTECTED]
 says...
>>>
>>>
>>> In article <Gd-
>>> dnQeZiuus0WLanZ2dnUVZ_j6dnZ2d@[EMAIL PROTECTED]
>,
>>> arnyk@[EMAIL PROTECTED]
 says...
>>>
>>>> I think that this computer may have some problems with
>>>> DC offsets in the digital domain. Some of the Orban
>>>> metering code might not
>> ignore
>>> them.
>>>
>>> The meter doesn't block DC. That gives most accurate peak
>>> indications because AC coupling introduces tilt into the
>> waveform
>>> unless the cutoff frequency is lower than around 0.15 Hz.
>>>
>>> Moreover, if the meter blocked DC and there was
>>> substantial DC
>> on
>>> the audio, the meter would not detect clipping due to
>>> the asymmetry.
>>
>> ...that being said, both loudness meters block DC because
>> of the highpass part of their equal-loudness contour
>> weighting filters. It is the VU and PPM meters that do
>> not block DC.
>
>I would argue that the reasons for not blocking DC apply equally to 
all 4 
>meters. If it is OK to block DC for two of them, then it is OK for all of

>them. 

Ther are good reasons for blocking DC to the loudness meters 
because the ear does not responds to DC, so DC las no loudness 
level.

However, the PPM, absolute peak, and VU meters are level meters. 
The insidious thing about blocking DC to peak level meters is that 
you no longer see the correct values of the digital samples so you 
can't detect clipping accurately.