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L 3 T0 P0 Cr-3COURSE TITLE: BUILDING SERVICES-IV

COURSE CODE: ARC314

WEEK NO.: 4 LECTURE NO.: 14

LECTURE DETAIL (To b !"#$ %ro& I$'!r)!*o$ P+"$,: R%+)!*o$ o% SO$

COURSE INSTRUCTOR: Ar.V*# S/"+ UID: 1320

CA CATEGOR: 003

E5A6 CATEGOR: 22

LSAD : AD01 : ARC7ITECTURE

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L 3 T0 P0 Cr-3COURSE TITLE:ARC314

LSAD : AD01 : ARC7ITECTURE Slide 02: Structure of Presentation

1. Questions from previous class

2. Reflection of sound from different surfaces

3. Flat surface

4. Convex surface

. Concave surface

!nd of Presentation

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CONTENT TOPIC: IS CODE 28

LSAD : AD01 : ARC7ITECTURE Slide "o. 03

Questions from previousclass

ABSORPTIVESURFACES!!!

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Questions from previous

classPorous aterials

Panel or emraneAsorers

Cavit" Resonators

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CONTENT TOPIC: E'!r"!!* Er'!


ections rom Flat Suraces%e li&%t'mirror analo&"( t%e re)ecte* +avefronts act as t%oori&inate* from a sound image. This image source is locate

*istance e%in* t%e +all as t%e real source is in front of t%s t%e simple case-a sin&le re)ectin& surface, In a rectan&( t%ere are si. surfaces an* t%e source %as an ima&e in all sin& ener&" ac$ to t%e receiver,

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Plane soundwavesimpinging ona convex

irregularitytend to bedispersedthrough awide angle i

the size otheirregularity islarge

compared tothe

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Refections rom Concave

SuracesPlane +avefronts of soun* stri$in& a concave surfaceten* to e focusse* to a point, T%e precision +it% +%ic%soun* is focusse* to a point is *etermine* " t%e s%ape

of t%e concave surface, Sp%erical concave surfaces arecommon ecause t%e" are rea*il" forme*, T%e" areoften use* to ma$e a microp%one %i&%l" *irectional "placin& it at t%e focal point, In t%e earl" *a"s of

roa*castin& sportin& events in 0on& 1on&( aresourceful tec%nician save* t%e *a" " usin& anor*inar" C%inese +o$( or coo$in& pan( as a re)ector,Concave surfaces in c%urc%es or au*itoriums can e t%esource of serious prolems as t%e" pro*uce

concentrations of soun* in *irect opposition to t%e &oal

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Plane soundwavesimpingingon a

concaveirregularitytend to beocussed ithe size o

theirregularityis largecompared

to the

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7O6EWORK9 REVISION9 UESTIONS:

LSAD : AD01 : ARC7ITECTURE

T/"$# o

LECTURE NO. Slide "o.11

arc314 l14

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