Comments on: Bales As Soundproofing http://www.strawbale.com/bales-as-soundproofing The World's Leader in Straw Bale Education Mon, 15 Mar 2010 17:52:48 -0700 http://wordpress.org/?v=2.9.1 hourly 1 By: Andrew http://www.strawbale.com/bales-as-soundproofing/comment-page-1#comment-27229 Andrew Tue, 24 Nov 2009 02:36:43 +0000 http://www.strawbale.com/?p=1012#comment-27229 Thanks for the correction and input Mark. I appreciate the feedback and references. Thanks for the correction and input Mark. I appreciate the feedback and references.

]]> By: Mark Gibbs http://www.strawbale.com/bales-as-soundproofing/comment-page-1#comment-27228 Mark Gibbs Tue, 24 Nov 2009 02:24:00 +0000 http://www.strawbale.com/?p=1012#comment-27228 Your explanation of sound insulation is incorrect ... when it comes to sound, what matters is how much the energy of a sound wave is attenuated when passing through a material. From NDT (yes, this site concerns ultrasonics but the basics apply to everyday frequencies): "When sound travels through a medium, its intensity diminishes with distance. In idealized materials, sound pressure (signal amplitude) is only reduced by the spreading of the wave. Natural materials, however, all produce an effect which further weakens the sound. This further weakening results from scattering and absorption. Scattering is the reflection of the sound in directions other than its original direction of propagation. Absorption is the conversion of the sound energy to other forms of energy. The combined effect of scattering and absorption is called attenuation." See also: http://www.britannica.com/EBchecked/topic/555255/sound/63976/Attenuation and http://asksciencelions.blogspot.com/2009/02/how-does-soundproofing-work.html Regards, Mark Gibbs. Your explanation of sound insulation is incorrect … when it comes to sound, what matters is how much the energy of a sound wave is attenuated when passing through a material.

From NDT (yes, this site concerns ultrasonics but the basics apply to everyday frequencies):
“When sound travels through a medium, its intensity diminishes with distance. In idealized materials, sound pressure (signal amplitude) is only reduced by the spreading of the wave. Natural materials, however, all produce an effect which further weakens the sound. This further weakening results from scattering and absorption. Scattering is the reflection of the sound in directions other than its original direction of propagation. Absorption is the conversion of the sound energy to other forms of energy. The combined effect of scattering and absorption is called attenuation.”

See also:

http://www.britannica.com/EBchecked/topic/555255/sound/63976/Attenuation

and

http://asksciencelions.blogspot.com/2009/02/how-does-soundproofing-work.html

Regards,
Mark Gibbs.

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