Re: How metering is calculated...
Re: How metering is calculated...
- Subject: Re: How metering is calculated...
- From: Brian Willoughby <email@hidden>
- Date: Mon, 1 Mar 2010 15:27:27 -0800
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
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden