Re: How metering is calculated...
Re: How metering is calculated...
- Subject: Re: How metering is calculated...
- From: James McCartney <email@hidden>
- Date: Mon, 1 Mar 2010 15:32:17 -0800
The question was how we were doing our metering. I'm answering that question, if only obliquely, and not some other question about how one might do it..
On Mar 1, 2010, at 3:27 PM, Brian Willoughby wrote:
>
> On Mar 1, 2010, at 15:11, James McCartney wrote:
>> There is also the issue of meter ballistics. A buffer to buffer reporting of RMS gain without any attack/decay smoothing would be too jittery for a user to be able to take a sensible reading from.
>
> ... except that it's impossible for the Mean to jump, even if the input is discontinuous. A low-frequency square wave is still going to result in a slow, 300 ms rise from 0 to the RMS value of the wave, then another 300 ms fall. Of course, if you're only calculating the RMS value across a single buffer, then you're integrating only about 2 ms of audio, and that might jitter quite a bit. To put it another way, you can simply factor the meter ballistics into the 300 ms time - I believe they're basically the same thing. Whether you're considering the electrical damping of an RC network or the mechanical damping of a spring and low-mass meter needle, it's still fairly simplistic. Isn't it?
>
> Brian Willoughby
> Sound Consulting
>
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