Updated on January , 2017. Copyright © 2017 KASUGA ENTERPRISES Vasai Maharashtra India.
Acoustics Study Acoustics    play    an    increasing    role    in    the    success    of    a    project.    As    such,    there    is undoubtedly   a   growing   awareness   and   need   for   properly   designed,   acoustically   treated rooms. To   achieve   ideal   room   acoustics,   one   must   first   understand   the   intended   use   of   the room,   then   carefully   study   and   analyze   direct   and   reflected   sound   for   both   voice   and music.   Music   is   best   appreciated   with   a   warm   or   rich   reverberation;   speech   is   clearer   in a   room   with   less   reverberation.   These   competing   characteristics   pose   a   challenge   to   the designer,    which    is    why    it    is    critical    to    work    with    acoustic    experts.    At    KASUGA ENTERPRISES ,    we    design    accurately    to    achieve    a    distinctive    result    with    minimum concession. Reverberation   time   refers   to   the   amount   of   time   required   for   the   sound   field   in   a   space   to decay   60dB,   or   to   one   millionth   of   the   original   power.   In   simple   terms   this   refers   to   the amount    of    time    it    takes    for    sound    energy    to    bounce    around    a    room    before    being absorbed   by   the   materials   and   air.   Closed   spaces   that   don't   have   materials   that   absorb sound   have   long   reverb   times   (concrete   arenas,   big   rooms   with   Gyproc   walls,   big   water tanks   etc.),   and   very   absorbent   rooms   have   short   reverb   times   (like   a   movie   theatre,   or   a carpet and drapery showroom). Reverberation   time   is   important   because   it   can   affect   how   well   you   understand   speech, and    it    can    change    the    way    music    sounds.    The    effect    on    speech    intelligibility    is noticeable   in   a   gymnasium   or   arena,   where   you   often   can't   understand   someone   who   is only   10   or   15   feet   away   from   you.   Once   you   are   an   adequate   distance   away   from   a person   speaking   to   you,   the   sound   level   of   the   room's   reverberant   field   is   as   loud   as their   voice.   The   effect   of   this   could   be   replicated   by   having   a   large   group   of   people standing   beside   you   repeating   what   you   say   at   different   levels   and   at   different   times. All this   additional   babble   coming   back   from   the   walls,   floor   and   ceiling   mask   and   muddle what   is   being   said.   When   the   reverb   time   is   long   enough,   it   not   only   masks   the   next syllable,   but   it   can   mask   the   next   word.   The   preferred   reverberation   time   range   for   a space   intended   for   speech   is   1.0   second,   or   less.   As   the   reverberation   time   (or   RT60) becomes    longer    than    that,    it    becomes    increasingly    difficult    to    understand    unaided speech,   and   if   it   is   much   shorter   the   room   sounds   very   dead.   As   the   RT60   gets   much longer,   3,   4,   or   even   5   seconds,   speech   becomes   impossible   to   understand.   This   can become   a   life   safety   hazard   in   some   environments   like   swimming   pools,   and   industrial settings, where warnings cannot be understood. Music   is   the   other   common   victim   of   inappropriate   RT60.   A   pipe   organ   sounds   like   a huge   harmonica   in   a   very   dead   room   (say   with   a   RT60   under   0.8   seconds),   it   may   be loud   but   it   has   no   character.   A   symphony   orchestra   in   an   anechoic   chamber   (a   room with   no   reflected   sound)   would   all   but   disappear   if   you   looked   the   wrong   way.   On   the other   hand,   a   lone   drummer   playing   in   a   space   with   a   6.0   second   RT60   would   disappear into   a   sound   blizzard   of   reflections.   For   each   type   or   style   of   music   there   is   an   optimum RT60, as well as a preferred set of early reflections.