4. Sound Power - Loudness and Level
Вставка
- Опубліковано 20 лип 2024
- We'll look at sound power as our first power quantity, and we'll find out how it's different from a field quantity like pressure. Sound power is a constant, non directional, calculated value and is quite significant in the field of acoustics. In this video, we'll see the applications of sound power as a tool for labelling, derive the formula for Sound Power Level (SWL) in decibels, and derive the formula for calculating sound pressure produced by a source of known power at any distance in an ideal space.
Find the full playlist here: • Loudness and Level
Content:
00:00 Sound Power
04:51 Formula for Sound Power Level (SWL)
06:20 Power and Field quantities
07:26 Calculation of sound pressure at a distance
References:
community.sw.siemens.com/s/ar...
www.sengpielaudio.com/calculat...
In this module on Loudness and Level we'll delve into how our sense of loudness is different for different frequencies and all the nuances associated with hearing. We'll look at level, and the technical ways of measuring and calculating the amplitude of signals. And finally we’ll look at a new way of measuring loudness that’s all the rage at the moment, the Loudness unit. It has redefined the standard used in streaming and broadcast, and promises to bring an end to the age of super compressed audio and the so-called loudness war.
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Great Videos! Thank you for making everything crystal clear. You have a great way of explaining things.
Thank you very much!
Thanks for your dedication and wonderful videos. I have enjoyed every video. Acoustics is a complicated subject and your videos help and I can point people to them when needed. Thanks again.
Thank you very much for the kind feedback! You've got a really interesting channel as well!
Great effort
Your videos are great! More people should watch them!
"If you build, they'll come"
Thanks for checking it out!
I had many confusions from my Physics classes. Your videos were suggested by UA-cam for the subject of acoustics and they are truly interesting!
Cheers! I'm glad it was useful!
Your videos are brilliant! Thank you very much.
Thanks very much for checking them out!
Thank you very much
You're welcome!
Thankyou sir, finishing it today
THANK YOU
Hi! thank you for sharing knowledge.
One quick question at 9:14, how come there is an absolute value at the 10log(q/4pir^2)? This mean that whenever you get closer to the source than 0.282m, the spl actually get quieter? How can this possibly be?
Hello there! Great observation. I was thinking about the same question when I was doing the research. The reason why I didn't explain this in the video was that I wasn't a 100% sure.
So the idea of sound power is purely theoretical. It's calculated for a point source. Point sources don't exist in nature, and for geometric calculations for surface area (to calculate sound pressure) we have to use a unit source rather than a point source, because the surface area of a point source is 0. In the metric system, the unit of measurement is a meter. So we consider a spehrical source of sound rather than a point source.
If we do this, then the sound power is emanating from the surface of this sphere, so naturally the sound pressure will be maximum at the surface (0.282m). If you go lower in distance, it's almost like you are going into the source of sound, which doesn't make sense. But you can also think about it like this:
You have a speaker in a cabinet. At the cone of the speaker, sound pressure is highest. But if you go further, you go past the cone and into the cabinet, essentially going through the source of sound to the other side. And if you think about it, sound pressure will be lower within the cabinet than at the cone.
@9:21, you are not entirely sure how useful this information is. Let me tell you, this whole video is very useful, helpful, and well made. Thank you.
Is it ok if I show parts of your videos to my students? The graphics are really useful and quite entertaining. Keep it up!
Ofcourse! Go for it.
This is actually quite useful. Thank you.
Cheers! Glad you think so..
The ability of source to produce sound is described by
a.sound power
b.sound pressure
c.sound energy
D.sound frequency
Need help with correct ans
Anyone pls help me with the right answer p