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Comparing Loudness Between Two Different Open Files?

 
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Vik_R



Joined: 26 Feb 2007
Posts: 2

PostPosted: Thu Dec 16, 2010 9:15 pm    Post subject: Comparing Loudness Between Two Different Open Files? Reply with quote

The vertical axis on the waveform chart is not labeled to show number of db. If I have two different sound files open in Amadeus Pro, is a waveform of one height in the first file, equally as loud as a waveform of the identical height, in the other file?

Thanks very much in advance for the info.

Best,


-Vik
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Thu Dec 16, 2010 11:17 pm    Post subject: Comparing Loudness Between Two Different Open Files? Reply with quote

The scale is not dB but is linear signal -- yes, the scales are the same
(unless you increased the size of one of them). Of course, you just
need to select a section of each and do "wavestats" and you have both
signal (max 1 min -1) and dB

Chuck

On 12/16/10 3:15 PM, Vik_R wrote:
Quote:
The vertical axis on the waveform chart is not labeled to show number of db. If I have two different sound files open in Amadeus, is a waveform of one height in the first file, equally as loud as a waveform of the identical height, in the other file?

Thanks very much in advance for the info.

Best,


-Vik




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Martin Hairer
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Joined: 08 Nov 2006
Posts: 1612

PostPosted: Fri Dec 17, 2010 10:43 am    Post subject: Comparing Loudness Between Two Different Open Files? Reply with quote

As Chuck mentioned, the scales are indeed the same, unless you
changed that. However, the perceived "loudness" of a signal depends
on many things, so two different signals that appear to have the same
"height" on the screen will probably not appear to have exactly the
same loudness. The "average RMS power" from the waveform stats
will give you better idea, but even this does not take into account the
fact that the human ear perceives different frequencies in different ways.
Regards,

Martin

HairerSoft
http://www.hairersoft.com/


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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Fri Dec 17, 2010 3:35 pm    Post subject: Comparing Loudness Between Two Different Open Files? Reply with quote

I will tack onto Martin's comments. You can experimentally see this
using AP. Create a sound about 20 seconds long where the first 5
seconds are sine, the second square wave, triangle wave and sawtooth at
about 400 hz. Play it. You can then do statistics on them and you will
find that all have the same maximum value; the sawtooth and triangular
wave will have the same rms value but the apparent level is considerably
different.

Chuck

On 12/17/10 4:43 AM, Martin Hairer wrote:
Quote:
As Chuck mentioned, the scales are indeed the same, unless you
changed that. However, the perceived "loudness" of a signal depends
on many things, so two different signals that appear to have the same
"height" on the screen will probably not appear to have exactly the
same loudness. The "average RMS power" from the waveform stats
will give you better idea, but even this does not take into account the
fact that the human ear perceives different frequencies in different ways.
Regards,

Martin

HairerSoft
http://www.hairersoft.com/


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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue Dec 21, 2010 7:23 pm    Post subject: Amadeus 1.5.3 Reply with quote

I can confirm the horizontal zoom does not work on 1.5.3 on a G4 with
10.4.11. If I click on the slider, I can get the position of the slider
to move (I can't move it by grabbing it) however, that is useless as the
thing doesn't zoom.

I just downloaded the1.5.3 and installed it today. I do have 1.5.2
still sitting on my machine so there is no real problem.

Chuck Jonah

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