5. Sound Intensity - Loudness and Level

We'll look at sound intensity as the last of the sound measurement metrics in the physical domain and compare it to sound power and sound pressure. The real advantage of sound intensity is its property of directionality, and we'll see how the spatial location of sound sources can be isolated with sound intensity using heat maps. Finally, we'll take a look at the decibel unit of sound intensity level and where its usefulness lies.
Find the full playlist here: • Loudness and Level
Content:
00:00 Sound Intensity
03:40 Inverse Square Law
04:55 Directionality
07:42 Measurements
08:20 Decibel quantity
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.
If you've got any questions, suggestions or recommendations, type them out here, or send me a message on any of my social channels mentioned below.
A lot of time was spent on creating this series, and I plan to do more. So please consider subscribing if you wish to be notified about more releases in the future. And if you feel generous: / akashmurthy
Check out the audio track in the intro and outro here: / tinderbox
Check out my music here: farfetchd-official.bandcamp.com/
Give me a shout here:
Facebook - / akash.murthy.319
Instagram - / thrifleganger

[@akashmurthy]

Corrections:
0:26 I've interchanged the units for Sound Pressure and Sound Power

[@cinematichormone]

Done sir 💞

[@mimranh1]

I never commented on any video on RUclips (may be Once in Million). But I cannot stop myself to comment that is GREAT WORK....

[@akashmurthy]

Thanks for taking the time to comment!

[@helloyoro]

Take a bow Akash! This series was amazing for someone who wants to learn concepts of Audio Engineering.

[@akashmurthy]

Thank you very much! :) Hopefully I can continue this series soon enough..

[@moinm007]

This is such an amazing series! I can't believe this is free. You've put so much effort in explaining complex mathematics using such simple graphics. I know this is a series I'm going to keep coming back to.
Fantastic work, Akash!

[@akashmurthy]

Glad you enjoyed it! Hope the series treat you well over the years.

[@paraglider-pilot]

every video is a true treasure. best regards.

[@akashmurthy]

Thanks so much!

[@sankhubaludu3111]

Worth wise work. Respected sir

[@aj310790]

Amazing series! You broke down the topic into logical bits and then explained it with exceptional simplicity and absolute clarity. Thank you.

[@akashmurthy]

Cheers mate! Glad you enjoyed it..

[@paulpkae]

Beautifully illustrated and very well explained. These tutorials are fantastic and I have enjoyed watching them.

[@akashmurthy]

Thanks very much mate! :)

[@VegasOct1Sounds]

Thanks again for a well done and beautifully illustrated video of an often confusing subject matter.

[@akashmurthy]

Thank you again for the support!

[@outofoffice99]

These are really good videos to comprehend the acoustic power and intensity concepts. Good visualisation of the concepts.

[@akashmurthy]

Thanks mate!

[@streamoutAUOLD]

Superb series of tutorials Akash. The best I have seen on this subject. Well done and I hope you'll do more!

[@akashmurthy]

Thanks mate! I hope to continue this series soon.

[@Illkacirma]

great series. thx!

[@sebastianvallejoperez9754]

cant wait for part 6 jajaja, huge thanks

[@saulwarren9611]

excellent video thank you. you made things clear not only by mathematic expression, but technically as well as practically.

[@akashmurthy]

Cheers! Glad you found it useful!

[@restoband7338]

Thank you so much for this series :)

[@akashmurthy]

You're welcome!

[@Yo-oz6pj]

Please make a tutorial video on how you make your videos, how you edit them, how you created that animation intro video with sound, how you create animated tutorials like these, etc.

[@akashmurthy]

I think I'll be sticking to making just videos on audio technology. There are plenty of videos on RUclips regarding this kind of animation. Keywords: Adobe After Effects, Motion graphics.

[@figaro-dg5c5]

This is great stuff, Akash.
You're very good at explaining.

[@akashmurthy]

Thanks very much! :)

[@isandybread321]

I'm stuck on the concept of sound/energy, And it applications. Thxs for this video.

[@cinematichormone]

Finally done sir , Thankyou for you efforts

[@akashmurthy]

You're welcome! :)

[@mokhasunotsi6215]

great stuff
Best vid on this topic

[@akashmurthy]

Thank you!

[@kamalkrishnabiswas3040]

Great Video mate 👏

[@akashmurthy]

Thank you!

[@MANUCHOTTU]

Thankyou So much...

[@borisdjokaboris6424]

Thanks a lot for thé sharing

[@akashmurthy]

You are welcome!

[@pranavgupta27]

Good Job

[@modeswitching]

Thanks for such a detailed and beautifully animated series of videos! One possible correction on this one: At 0:29, are the units for sound pressure and sound power reversed?

[@akashmurthy]

Oh wow! I hadn't noticed that, you're right! Thanks for pointing that out, and for the lovely feedback!

[@borisdjokaboris6424]

Can you also do videos of the resultant(equivalent) acoustic pressure of sound wave please??...thanks again for the sharing...and the images and animations are Just great!!

[@akashmurthy]

Hey there, thanks for that! There is a video on Sound Pressure on my channel, check it out!

[@aymaneelfahsi8048]

hello sir. Have you done videos on A weighting measurements? I'm working on an arduino project and i can't find much online. thanks for these videos!

[@akashmurthy]

You're welcome! I'm planning to cover A, K weighting at some point of time.

[@mohsens22]

Nice course mate.
But when will you upload stuff about analog and digital domain?
When recording, when the level meter shows -1db what does that mean?
Or when there's no input or we have absolute silence, meter shows "infinity" which in our course we understood that it should show "0 db" or some negative decibel value.
What's the matter with that?

[@akashmurthy]

Hey man.. I'm planning to cover dBFS at some point of time.
Quick answer to your question: dBFS is purely a reading of digital audio. Not analog. In digital audio, you have fixed number of states. 16bit audio let's say can store -32768 to +32767 distinct values.
Since in digital audio (fixed point), no values can be stored above this, this is kept as the base line standard.
So the formula for dBFS for 16bit audio is 20log(value/32768)
If the value is the highest representable value (full amplitude), then 20log(1) = 0 dBFS is the theoretical maximum.
Any value below that will have a negative dBFS value.
And in the case of pure silence, value will be 0.
In this case, 20log(0) is undefined, or if you want to represent it, tends towards negative infinity.

[@mohsens22]

@@akashmurthy Thank you! Excellent response!
But how is this "level" thing is calculated and quantified in the analog domain?

[@akashmurthy]

@@mohsens22 in the analog domain, when you are talk about level, you are talking about the voltage of the electrical signal. You can measure and compare voltage of signals using a volt meter.

[@mohsens22]

@@akashmurthy Thank you mate!

[@koto3754]

thanks akash

[@akashmurthy]

You're welcome mate

[@borisdjokaboris6424]

Can you do videos on building acoustics please??

[@akashmurthy]

That's not my area of expertise, I'm afraid.

[@timster5]

I'm not the legend, You are.

[@user-hm2gb6pm6b]

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