Re: free Orban loudness meter app now available

"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.