Re: How metering is calculated...
Re: How metering is calculated...
- Subject: Re: How metering is calculated...
- From: Grant Robinson <email@hidden>
- Date: Tue, 2 Mar 2010 10:32:21 -0700
So, off-the-record, you are saying that you are doing buffer-to-buffer
reporting of RMS gain with attack/decay smoothing? Does the
attack/decay smoothing require values from previous buffer
calcuations, or can it all be done on-demand?
Grant
On Mon, Mar 1, 2010 at 4:32 PM, James McCartney <email@hidden> wrote:
>
> 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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Grant Robinson
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