Re: [LAD] Suitable peak/RMS/etc. data for UI metering

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To: Fons Adriaensen <fons@...>
Cc: <linux-audio-dev@...>
Date: Tuesday, July 26, 2011 - 4:17 am

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On Mon, Jul 25, 2011 at 12:03 PM, Fons Adriaensen wrote:

> On Mon, Jul 25, 2011 at 11:43:14AM -0400, David Robillard wrote:

Hi Fons,

I'm interested in what you're saying about RMS metering. Could you give me
specifics or point me to a reference? I can't find anything by googling.
What sort of low pass filter is used for audio metering, for example?

Jeremy

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On Mon, Jul 25, 2011 at 12:03 PM, Fons Adriaense=
n <fons@linuxau=
dio.org
> wrote:

On Mon, Jul 25, 2011 at 11:43:14AM -0400,=
David Robillard wrote:

> */

In all cases I know of the RMS value required for metering, dyn=
amics
processing, etc. is *not* the average over a period, nor over any other
rectangular window. It is the result of applying a specific lowpass
filter on the squared samples, which one depends on the application.

This means that:

* period_start: can be useful.
* period_size: should be defined as the number of samples processed
=A0since the last event.
* The definition of RMS as you provide it should be dropped.

Ciao,

--
FA

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Hi Fons,

I'm interested in what you're saying about RMS metering.=A0 Could y=
ou give
me specifics or point me to a reference?=A0 I can't find anything by=
=20
googling.=A0 What sort of low pass filter is used for audio metering, for e=
xample?Jeremy

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Messages in current thread:
[LAD] Suitable peak/RMS/etc. data for UI metering, David Robillard, (Mon Jul 25, 3:43 pm)
Re: [LAD] Suitable peak/RMS/etc. data for UI metering, Fons Adriaensen, (Mon Jul 25, 4:03 pm)
Re: [LAD] Suitable peak/RMS/etc. data for UI metering, Jeremy Salwen, (Tue Jul 26, 4:17 am)
Re: [LAD] Suitable peak/RMS/etc. data for UI metering, Fons Adriaensen, (Tue Jul 26, 6:33 am)
Re: [LAD] Suitable peak/RMS/etc. data for UI metering, David Robillard, (Mon Jul 25, 5:45 pm)