⢢ᙲ#㴟ⴊ⮎#ἶ#⭏ⴲᇂ#ⴊᶇᆾ#
ᇓⴖ⢢ⴖ#ⴊ⛯⁃Ẋᦂ⮎#↶㐖ᡒ#⮿㭣
Ǧ
߿Қʂॡİæ߹ėॡę
ۿսێۙțښێ ս܁ێۙțښێ ࢘ێۙțښێ
ొ ߧ: ҆ȦЛڹİ֬фধۆ֬ęÏڹՙőϿėÂقԴæ߹υÇۦΒقۆ३ьԦॣսەəܟڍŊۆڼ͟ۋÀ
Ԑ͊ۆߔÁۺڼՁϼΒʪقй࠘əٖॳقʂॠيőϼॠČۙॠٕɰ. ۋεڦ३ʂॡİÌۆ֬ۆܟ,ڍࠑѹقড়ڼ ۦεԺ࠘ॠٕڷ϶, تۋȥڼ֨֟ࢰںۋڌॠيܟࠑŊٮڍࠑŊۆڼؓͪѲںÁÁࠑ܁ॠٕɰ. ̚ॢড়ڼۦεԺ
࠘ॠşۻęÌۆ֬قԴ܁ԜߔͳۆʂॡԦ20ϼںʂԜڷͿڼۼࢬ֟࣡εսॱॠيتۋÂڼ͟ۋق˰δڼ ՁϼΒʪεܓԐॠٕɰ. ŔĀęࠑѹقড়ڼۦεԺ࠘ॢѹߕقÀūڗݗսتۋÂڼ͟ÀࡾóьԦॢɰə
۾ں؎սەؽڷ϶ێҙսڼ۾قԴə߯ՙѺজÇݓफۍ3 dB ۋԜۋÀьԦॠəĖʪەؽɰ. ̚ॢࠑ܁۾ѻ
˰͆ԴتۋÂڼ͟ÀÌۆ֬ۆڼՁϼΒʪقٖॳںйࠜսەڼں؎սەؽɰ.
ෑਕઘ: تۋÂڼ͟, ڼՁϼΒʪ, ڼۼࢬ֟࣡, ڼॳՁɠࠑ܁, ԜěěćқԵ, Ìۆ֬
ABSTRACT: The present study investigates the effect of the inter-aural level difference(ILD) on the syllable articulation test in classrooms which can be occurred by the absorption of interior surfaces. In order to do this, the sound absorbing materials were installed in the classroom and sound pressure level(SPL) at each ear was measured using binaural recording systems. Also, syllable articulation tests were carried out at a classroom with and without sound absorption materials by 20 students who have normal hearing condition, in order to investigates the effect of the ILD on the speech intelligibility. As a result, it was found that the larger inter-aural level differences was occurred at the nearer positions to lateral walls after sound absorptions were applied to lateral walls in the classroom. At some places, the measured ILD was lager than JND of sound level (3dB). Also, it was shown that the correlation coefficient of inter-aural level difference with the score of syllable test has the significant result(-0.441). Thus, It is concluded that ILD can affect the subjective speech intelligibility in classrooms.
Keywords: Inter-aural level difference, Speech intelligibility, Syllable articulation test, Acoustic measurement, Correlation analysis, Classroom
PACS numbers: 43.55. Hy
Department of Architectural Engineering, Chungbuk National University, Cheongju, 361-763, Republic of Korea (Tel: 82-43-261-2438, Fax: 82-43-260-2438)
*Դ
֬ǴėÂںĵՁॠəæ߹ۺڅՙقəѹߕфц ɱ, ߎۤˣۋەڷ϶, ێъۺۍąڍԐ͊ۆŊقÀ
ۤÀūۋڦ࠘ॠČەəæ߹څՙəѹߕۋɰ. ˰
͆ԴѹߕۆԜфशϸԜ, ড়ڼέˣڹߔࠄۙ
قóʪɵॠəڼॳںѺজ֨ࢅəÀۤࢀڅՙۋ
϶, ۋͿۍ३ڼقȃݓəɰتॢѺজٮٷčںێ
ڷࢉڷͿ׆ĀĶѹߕقۍۿॢߔࠄۙÀՙνεۍ
ݓॠəʚࢀٖॳںй࠘óʽɰ. , ėÂںĵՁॠ
əɰتॢæ߹ۺڅՙܼѹߕقۆ३ڼۆѓॳՁ
+d,#Dfrxvwlf#shuirupdqfh +e,#Shufhswlrq#ri#gluhfw#dqg#uhiohfwhg#vrxqg#dw#hdfk#uhfhlyhu#srlqw Ilj1#41#Looxvwudwlrq#ri#wkh#uhodwlrqvkls#ehwzhhq#wkh#vxuidfh#frqglwlrqv#dqg#dfrxvwlf#shuirupdqfh1
қфݓٍ֨ÂˣۋѺॠóʼ϶ۋəďߔࠄۙۆ
ڼॳںۍݓॠəʚܳڅॢۍۙͿۚڌॠəìۋɰ.
֬ǴėÂۆڼॳںथÀॠəݓशͿ׆ۛॳ֨Â (RT) ںҼ΅ॢɰتॢڼॳݓश˞ۋەڷ϶, Ŕܼ
قԴʪڼՁۻɵՁɠ(speech intelligibility)ںНνۺ ڷͿथÀॠşڦॢۍۙͿ׆D
50фSTI ˣںԐڌॠ Čەɰ. Ŕ͠ǣۋ͠ॢНνۺڼॳݓशəɳۋݓ श(monaural index)Ϳ׆ՙνۆۓԐѓॳфѓॳՁ қق˰δڼقȃݓۆ܁҃εप॥ॠݓЇॠə֬܁
ۋɰ. ˰͆ԴইۦڼϼΒʪۆथÀεڦॢ֬Ǵڼ ॳݓशͿəܟڍŊقۓԐʼəڼقȃݓۆۋͿ
ьԦॣսەəϼΒʪۆѺজεࣷ؊ॣսػɰ.
ъϸԐ͊ۆŊəϢνۆتޅقڦ࠘॥ڷͿۍ३
ܟڍŊقۓԐʼəՙνۆࡾşфʪɵ֨Â, ѓ ॳՁқقʂ३ۍݓॠóʼ϶ۋəďՙνۆڦ࠘, äν, ėÂÇˣۆۍݓфࣺɳقٖॳںй࠘óʽ ɰ. ۋͩóتŊۆڼॳՁɠںथÀॠşڦॢݓश εتۋݓश(binaural index)͆ॠ϶ŔܛΪقəتۋ Ԝěćս(IACC, Interaural Cross-Correlation), تۋÂ
֨Â(ITD, Interaural Time Differences), تۋÂڼ͟
(ILD, Interaural Level Differences), تۋÂڼԜ
(IPD, Interaural Phase Differences) ˣۋەڷ϶,
[1]ۋ͠
ॢݓश˞ںࣀ३ėÂقԴьԦॣսەəتࠑŊ ÂۆڼॳѺজε܁͟জॠäǣۋεۍڦۺڷͿ
Ѻজ֨ࢉڷͿ׆ڼॳقʂॢۍݓՁɠںܓۼॣս
ەɰ. Ŕ͠ǣۋ͠ॢÒȝڹݓŚūݓ֮νڼॳф
ڼॳ֪қآقԴæ߹ėÂۋ؉ɨÀԜڼۤԜق ԴڼԜ܁ڦфėÂÇওڹۍۙۆѺڦق˰δڼ
ݗۆѺজقٍĵεڦ३টڌʼرٵɰ.
[2,3]˰͆Դ
şܕۆٍĵĀęͿəæ߹څՙقۆ३ьԦॣսە əܟڍŊÂۆНνۺۋÀϼΒʪقй࠘əٖ
ॳںԺϼॣսػڷ϶, ʌҝرتۋÂڼॳठͿ
ۍॢܳěۺϼΒʪۆۋεथÀॠşڦॢتۋݓ श̚ॢۻИॢ֬܁ۋɰ. ɰχսथϸقԴʪɵॠ əъԐڼقҼ३սݔϸقԴʪɵॠəߣşъԐڼ ۋϼΒʪقʌڎࢀٖॳںйࠚɰəٍĵĀęε
ࣀ३ՙνۆѓॳՁқۋڼՁۻɵՁɠقٖॳںй ࠚɰə۾ۋэঅݕцەɰ.
[4,5]Ŕ͠ǣ֬܃æ߹ėÂقԴ֬ǴυÇۦقۆॢت ۋÂڼ͟əϔڍҾѥॠóьԦॠČەɰ. ٚε
ՁɠۋȭڹۦΒε, ъʂठѹߕقəড়ڼՁɠۋ
äۆػəۦΒͿυÇॢˏÁѹߕͿҙࢢۍۿॢ
äνقսڼ۾ںԺ࠘ॠČ˃ѹߕͿҙࢢʴێॢä νقڦ࠘ॢڼڙقԴՙνεьԦ֨࢈ąڍÁս ڼ۾قԴࠑ܁ʽتۋÂڼ͟əԴͿɰβóǣࢍ
Ǧɰ. , ড়ڼՁɠۋȭڹѹߕقۍۿॢߔࠄۙə
ѹߕۆড়ڼέقۆ३ݔۿڼęъԐڼۆقȃݓت قठÀьԦॠóʿڷͿ׆ѹߕقÀūڏŊٮ
ڼڙقÀūڏŊقۓԐʼəڼ͟قۋÀьԦॠ óʼəìۋɰ. ۋͿۍ३ড়ڼՁɠۋǰڹѹߕق
ۍۿॢܟԵ҃ɰড়ڼՁɠۋȭڹѹߕŖߌۆܟԵ
قԴتۋÂڼ͟À࠶ݙڷͿ׆ڼॳۆۍݓՁɠ
قʌڎࢀٖॳںйࠜսەڷ϶, ০ڼՁۆڅ३
ʪقٖॳںйࠜìڷͿٚԜʼəцۋɰ.
Wdeoh#41#Dufklwhfwxudo#glphqvlrq#ri#fodvvurrp1
Contents Dimension
Length 14.2 m
Width 8.65 m
Height 2.71 m
Volume 332.87 m
3Area of Floor (F) 122.83 m
2Number of Seat (N) 110 seats
Area of Audience in floor (F/N) 1.11 m
2Volume of Audience in floor (V/N) 3.03 m
3+d,#Sodq
+e,#Vhfwlrq
Ilj1#51#Wkh#gudzlqj#ri#wkh#fodvvurrp1
ۋ͠ॢÀԺڹRonsse ˣ(2010)ۆٍĵĀęقԴ
رɗ܁ʪۓݒʽцەɰ. Ronsse ˣڹ2008țҙࢢ
2009 țūݓ2țقèߝйĶߣˣॡİۆ2ॡțę4 ॡțİ֬ںʂԜڷͿتۋԜěćսٮتۋÂڼ͟
ˣںࠑ܁ॢˏսॡфʫ३Ձۺę॥ƍқԵॠ
ٕڷ϶, ŔĀęتۋÂڼ͟Àࡾϸʫ३Ձۺۋ
ǰɰəĀںʪॢцەɰ. Ŕ͠ǣۋٍĵəت ۋÂڼ͟قۋق˰δսॡфʫ३ՁۺںҼ İॢìڷͿ׆تۋÂڼ͟ÀॡԦۆڼՁۻɵՁ ɠقݔۿۺۍٖॳںйࠚìۍݓقʂॢथÀÀ
رͷɰ.
[6]˰͆Դ҆ȦЛقԴə֬Ǵড়ڼۦԺ࠘εࣀ३
تۋÂڼ͟ۆѺজεࠑ܁ॠČۋεڼۼࢬ֟࣡
ĀęٮҼİॠي, تۋÂڼ͟ÀॡԦۆߔÁۺ
ڼՁϼΒʪ(speech intelligibility)قй࠘əٖॳقʂ ३э০Čۙॢɰ.
[7,8]**ٍĵۆѓѪ
تۋÂڼ͟ق˰δڼՁϼΒʪۆۋεथÀ ॠşڦॠيCʂॡİÌۆ֬ںʂԜڷͿѹߕقড় ڼۦεԺ࠘ॠşۻęڦ࠘ѻܟࠑŊٮڍࠑŊ ۆڼؓͪѲںࠑ܁ॢˏتۋÂڼ͟εԓॠٕ
ɰ. ̚ॢتۋÂڼ͟ق˰δڼՁϼΒʪۆۋ εࣷ؊ॠşڦॠيڼॳՁɠࠑ܁۾ęʴێॢڦ࠘
قԴڼۼࢬ֟࣡ε֬֨३ԜěěćεқԵॠٕɰ.
۩ঃվԩଭ୪
ٍ҆ĵۆʂԜڷͿԐڌʽCʂॡİÌۆ֬ڹأ
110 ϼۆॡԦںսڌॣսەəܼőϿÌۆ֬Ϳ׆
ÀͿͿšۤѓۆεÍ߸Čەɰ. ÌԐۆٍ
Ժںڦ३Ìۆ֬ۆۻϸقəࣺࠜфİࢎę॥ƍ
أ30cm ȭۋۆÌɳۋԺ࠘ʼرەɰ. ॡԦ˞ۆ
Ԝڹߪ3ÒۆŔΝڷͿǣɌر܋ەڷ϶Ìۆ֬ۻ ߕقèߝŒˣॠóқपʼرەɰ.
ʂԜėÂۆæ߹ۺ܃ڙڹTable 1ق܁νॠٕڷ
϶ŔԜڹFig. 2ۆʪϸقǣࢍǦìęÏɰ.
ใଣ୍ଭড౿
ʂԜÌۆ֬ڹ4ϸܼ3ϸۋࡓࡾν࣡ѹߕۋ϶,
ǣϢݓॢϸڹڮνڷͿۋΘر܋ەɰ. ̚ॢц ɱڹࡓࡾν֢࣡͒ҵڦقҼɩࢍێۋԺ࠘ʼرە ڷ϶ߎۤڹড়ڼࢭ֟ࢍێͿĵՁʼرەɰ. ۋߌ
ͤߎۤęцɱں܃ٽॢ֬ǴۆԐϸۋъԐۦͿ
ۋΘرݕėÂقԴəݔۿڼęʴ֨قԐѓقԴۻ ɵʼəъԐڼڷͿۍ३تۋÂڼ͟ÀࡾóьԦ ॠݓ؍əɰ.
Ŕ͠ǣѹߕۆॢޅϸقড়ڼՁɠۋȭڹυÇۙ
ۦÀԺ࠘ʼرەəąڍڼڙڷͿҙࢢѓԐʽڼق ȃݓÀড়ڼۦقۆ३۹ÇʼرܟࠑŊٮڍࠑŊ قۓԐʼəڼقȃݓۆتęÀɵ͆ݕɰ. ۋ
͠ॢąڍə֬܃ėÂقԴʪ֖óۿॣսەəʚ, ড়ڼՁɠۋȭڹড়ڼۦͿυÇʽধۆ֬фÌۆ
֬, ϥ࣯й˥ر֬ۋцͿŔìۋɰ. ۋ͠ॢėÂڹ
ݥڹۛॳ֨Âںڦॠي֬ۆőϿقěćػۋȭڹ
ড়ڼՁɠںÀݕυÇۦεѹߕقۻߕقۺڌॠó
Wdeoh#51#Ilqlvklqj#pdwhuldov#dqg#wkhlu#vrxqg#devruswlrq#Frhiilflhqw#lq#fodvvurrp1
^<044`+d,#Ehiruh#wkh#vrxqg#devruswlrq#wuhdwphqw +e,#Diwhu#wkh#vrxqg#devruswlrq#wuhdwphqw
Part Material
Sound absorption Coefficient Frequency (Hz) 125 250 500 1k 2k 4k
W a l l
Front Glazed concrete and Black board 0.24 0.20 0.20 0.18 0.18 0.21 Right Glazed concrete 0.01 0.01 0.01 0.02 0.02 0.02 Left Window 0.18 0.06 0.04 0.03 0.02 0.02 Rear Glazed concrete 0.01 0.01 0.01 0.02 0.02 0.02 Ceiling Mineral fiber board 0.16 0.53 0.44 0.51 0.59 0.58 Floor Concrete 0.01 0.01 0.01 0.02 0.02 0.02 Furniture Wooden desk & chair 0.57 0.61 0.75 0.86 0.91 0.86
Part Material
Sound absorption Coefficient Frequency(Hz) 125 250 500 1k 2k 4k
W a l l
Front Glazed concrete and Black board 0.24 0.20 0.20 0.18 0.18 0.21 Right Tectum panel 25mm 0.06 0.06 0.13 0.24 0.45 0.82
Left Hanged heavy
curtains 0.60 0.50 0.30 0.25 0.25 0.40 Rear Aluminum foam 9mm (air cavity 200mm) 0.50 0.50 1.00 0.76 0.49 0.58 Ceiling Mineral fiber board 0.16 0.53 0.44 0.51 0.59 0.58 Floor Concrete 0.01 0.01 0.01 0.02 0.02 0.02 Furniture Wooden desk & chair 0.57 0.61 0.75 0.86 0.91 0.86
僟#V|oodeoh#whvw 僠#Uhdu#zdoo 僟#V|oodeoh#whvw 僠#Uhdu#zdoo
僡#Ohiw#zdoo 僢#Uljkw#zdoo 僡#Ohiw#zdoo 僢#Uljkw#zdoo
+d,#Slfwxuhv#ri#wkh#fodvvurrp#ehiruh#vrxqg#devruswlrq#wuhdwphqw +e,#Slfwxuhv#ri#wkh#fodvvurrp#diwhu#vrxqg#devruswlrq#wuhdwphqw Ilj1#61#Slfwxuhv#ri#wkh#fodvvurrp#ehiruh#dqg#diwhu#vrxqg#devruswlrq#wuhdwphqw1
ʼəʚۋͿۍ३ѹߕقŖۿॢܟԵقԴتۋÂڼ
͟ÀьԦॠóʼČ, ėÂۆܼؖҙقڦ࠘ॢߔ ࠄۙٮѹߕقŖۿॢڦ࠘ۆߔࠄۙÂقتۋÂڼ
͟ۆठÀьԦ॥ڷͿ׆ʴێॢڼՁ֪εۍ ݓॠəՁɠۋԴͿɵ͆ݗսەɰ.
ٍ҆ĵقԴəۋߌͤ֬܃ėÂقԴ֬ǴυÇۙ
ۦقۆ३ьԦॣսەəتۋÂڼ͟εĵইॠ şڦॠيÌۆ֬ۆتࠑѹقড়ڼۦεԺ࠘ॠٕ
ɰ. ̚ॢড়ڼ֨˓ѹقۆॢъԐڼۆٖॳںѕ܃
ॠşڦॠي˓ѹ̚ॢড়ڼۦεԺ࠘ॠٕɰ. ֬ॹ
ًۆড়ڼՁɠۋڍսॢɰėݗՁড়ڼۦεԐڌॠ
ٕɰ.
֬ॹقԐڌʽড়ڼۦۆܛΪфԺ࠘ҙڦٮÁ
ۦΒۆড়ڼέڹTable 2قϼ֨ॢцٮÏڷ϶, Ŕ
ÉڹЛॶфěʹυÇۦۆࣺϔغߕقԴ܃ėॢ
֬ॹĀęεşܵڷͿۚՁʼؽɰ. ̚ॢ֬ॹ֨Ìۆ
֬ǴÁҙڦѻড়ڼۦۆԺ࠘Ͽ֥ęڼۼࢬ֟࣡
֬ॹۤϸڹFig. 3قǣࢍǦìęÏɰ.
ਓٛଣේনۇ౸୨
ড়ڼۦۆԺ࠘ق˰δتۋÂڼ͟ۆѺজε؎
؉҃şڦॠيتޅŊۆ֬ǴڼॳՁɠںࠑ܁ॠٕ
ɰ. Ìۆ֬ۆ֬ǴڼॳՁɠࠑ܁قەرԴ֬ॹێ֨
фࠑ܁şşۆԸ࢘, ڼڙۆՁˣڹԐۻقইۤ
Ԑ܁ںÇ؋ॠيܓԐ·Ը࢘ʼؽڷ϶Ͽ˜֬ࠑڹ
KS F 2864( ֬ǴėÂۆۛॳ֨ÂęڼॳѺսࠑ܁
ѓѪ)ق˰͆֨ॱॠٕɰ.
Wdeoh#61#H{dpsoh#ri#v|oodeoh#duwlfxodwlrq#whvw#olvw1
͇ կ β ֧ ƚ ॠ ١ ޚ ع
û ŷ ݗ ϥ ̞ ű ˄ Ԝ ɫ ۼ
╊ ऽ ֩ Ϣ ֻ Ҿ Ʒ ˣ Ο
ɺ ͈ ̷ ͪ ƹ ࣥ ے ʚ ܀ ݡ
ڐ ࢹ ё ƍ ę ζ қ ݚ ު ֤
Ilj1#71#Vrxqg#vrxufh#dqg#uhfhlylqj#srvlwlrqv1
Ilj1#81#Ghylfh#vhw0xs#ri#wkh#urrp#dfrxvwlfv#sdudphwhu phdvxuhphqw1
ڼڙڹԐ͊ۆڼՁںĵইॠşڦ३ИݓॳՁ֟
क़࠶εԐڌॠٕڷ϶Ժ࠘ڦ࠘əÌٍ֨ÌԐۆۓ ںşܵڷͿॠيÌɳۆܼؖҙцɱقԴ1.5 m ȭ ۋقԺ࠘ॠٕɰ. ֬ǴڼॳՁɠࠑ܁֨ڼڙ֪ə
MLS εԐڌॠٕڷ϶ͳڼؓͪѲڹ֬܃Ìۆۙ
ۆڼՁںşܵڷͿԺ܁३ڼڙڷͿҙࢢ1 m ؘق Դࠑ܁ॠٕں˺أ75 dB(A)
[9]Ϳێ܁ॠóѓԐॠ
ٕɰ. تۋÂڼؓͪѲۆࠑ܁֨ۋεÓԵقԴ1/3 ٢ࢍҵї˚Ϳأ10ߣÂ3ধࠑ܁ॢˏŔथŒÉں
Ԑڌॠٕɰ.
ÓԵقԴۆࠑ܁֨Ԑ͊ۆϢνۻɵ॥ս(HTRF) ٮŊۆݓॳՁںۺڌॠşڦ३Head Acoustic Ԑ ۆتۋȥڼ֨֟ࢰ(binaural recording system)ۍHMS III.L ںԐڌॠٕɰ. սڼ۾Ժ܁֨Ìۆ֬Ǵڦ࠘ѻ
تۋÂڼ͟ε҃ɰϸн০êࢹॠşڦॠيۻߕ
110 ÒܟԵܼ60Òۆࠑ܁۾ںԸ܁३֬ǴڼॳՁ ɠںࠑ܁ॠٕڷ϶, Áսڼ۾ۆȭۋəԜق،
ڹॡԦۆŊεşܵڷͿцɱقԴ1.2 m ȭۋͿԺ
܁ॠٕɰ. Fig. 4əتۋÂڼؓͪѲࠑ܁фڼۼࢬ
֟࣡սॱ֨ۆԺ܁ॢࠑ܁۾ںڦ࠘εथϸʪقǣ
ࢍǶìۋ϶, Fig. 5əتۋÂڼؓͪѲࠑ܁قԐڌ ʽۤҼۆĵՁʪεǣࢍǴČەɰ.
ઑଲԩଣ߆ఙծॺ
تۋÂڼ͟ćԓė֩ںটڌॠϸتۋȥڼ֨
֟ࢰںۋڌ३ࠑ܁ॢڼؓͪѲÉڷͿتۋÂڼ͟
εćԓॣսەɰ. ێъۺڷͿتۋÂڼ͟ۆ
ćԓė֩ڹɰڼۆ֩(1)ęÏɰ.
[12]
يşقԴ, SPL
leftəܟࠑŊقԴࠑ܁ʽڼؓͪѲں
SPL
rightəڍࠑŊقԴࠑ܁ʽڼؓͪѲۋɰ. ˰͆Դ
ڦۆ֩ںࣀ३ćԓॢĀęÀتսێąڍܟࠑق ԴۓԐʽՙνÀڍࠑقԴۓԐʽՙν҃ɰڼؓͪ
Ѳۋࢀìںۆйॠ϶ڼսێąڍڍࠑقԴۓԐ ʽՙνۆڼؓͪѲۋܟࠑقԴۓԐʽՙν҃ɰࡾ
ɰəìںۆйॢɰ.
ଣୣഓਆൈ
تۋÂڼ͟ÀڼՁۻɵՁɠقй࠘əٖॳں
ܓԐॠşڦॠيڼؓͪѲںࠑ܁ॢڦ࠘قԴড়ڼ ۦεԺ࠘ॠşۻęقߔࠄ֨ॹںսॱॠٕɰ.
֨ॹ֨ܳěۺڼՁۻɵՁɠںथÀॠşڦ३ڼۼ ࢬ֟࣡Ѫ(syllable articulation test)ںԸ࢘ॠٕɰ. ڼ ۼࢬ͈֟࣡क़֬ॹۙÀڼڙڷͿҙࢢѓԐʽɳڼ ۼۆ֨ॹڌڼڙں˝Čы؉ۺəѓѪںϊॠ϶, Ŕ܁ɻέںࣀ३ėÂقԴߔۙۆڼՁϼΒʪεथ Àॠəìۋɰ. Á֨ॹقԐڌʽڼۼڹۆйÀػ əɳڼۼͿ׆ڼՙѻͿǦۋʪۆŒںۋΘČە əڼۼЀںԸ࢘ॠٕڷ϶, ьڼԜܼ҄ʼəڼۼ ڹ܃ٽॠٕɰ. ɰڼۆश3ڹڼۼࢬ֟࣡قԐڌʽ
ڼڙЀۆٚ֨εǣࢍǴČەɰ.
[13, 14]ߔࠄ֨ॹĀęۆ۾قەرԴॢĶرशܵьڼ ѪںşܵڷͿʴێॢьڼںÍəڼۼڹϿ˃܁
ɻڷͿۍ܁ॠٕəʚ, ٚε˞ϸ‘܀’ۋ͆əڼۼۆ
Wdeoh#71#MQG#ri#vrxqg#suhvvxuh#ohyho1 JND Discontinuous sound source 3 dB(A)
Continuous sound source 1 dB(A) ąڍशܵьڼۍ‘❞’ę֬܃ڼڙۍ‘܀’ ٽقʪʴ
ێॢьڼۍ‘܂’ ̚ॢ܁ɻڷͿۍ܁ॠٕɰ.
[15]ߔࠄ֨ॹڹॢĶرεϿĶرͿԐڌॠəC ʂॡ İॡԦܼ22ՃقԴ25ՃۆॡԦ20ϼںʂԜڷͿ
֬֨ॠٕڷ϶, ֬ॹۻԺЛܓԐĀęϿ˃܁Ԝߔ ͳںՙڮॠČەəìڷͿǣࢍǮɰ.
̚ॢ֬Ǵড়ڼͳѺজق˰δتۋÂڼ͟ٮ
ۋͿۍॢڼՁϼΒʪεࣷ؊ॠşڦॠيÌۆ֬ۆ
ࠑѹقড়ڼۦεԺ࠘ॠşۻęߪ2ধقèߝݕ ॱʼؽɰ. ڼۼࢬ֟࣡սॱ֨क़֬ॹۙۆथÀڦ࠘
ə֬ǴڼॳՁɠۆࠑ܁ڦ࠘ٮʴێॠóԺ܁ॠٕ
ڷ϶Ŕڦ࠘əFig. 4قǣࢍǦцٮÏɰ. 1ধ֬ॹ
֨20ϼۆॡԦ˞ڹÌۆ֬ںۻъҙ, ܼъҙ, ъ ҙقԺ܁ʽࠑ܁۾قԴߪ3ধقèߝथÀεսॱ
॥ڷͿ׆Ìۆ֬ۻߕًٖقʂॢܳěۺथÀÀ
ۋΘرݓʪॠٕɰ.
क़֬ॹۙəИݓॳՁ֟क़࠶εࣀ३ͳʽڼۼ ں2ߣʴ؋˝Č4ߣÂы؉ۺʪ॥ڷͿ׆Ŕ܁
ɻέںࣀ३ڼՁۻɵՁɠںथÀॠٕɰ.
ڼۼࢬ֟࣡قԐڌॢڼڙڹИॳ֬قԴȥڼॠ ي؉ǣڏԴۆڼՁںԐڌॠٕɰ. ڼۼࢬ֟࣡սॱ
֨ÁڼۼںьԦ֨ࢅəڼڙڷͿИݓॳՁ֟क़࠶
εԐڌॠٕڷ϶Ŕڦ࠘əÌۆ֨ÌԐۆڦ࠘ۍ
ÌɳۆܼؖҙقԺ܁ॠٕɰ. ̚ॢڼڙۆͳڼؓ
ͪѲڹأ75 dB(A)Ϳ֬ǴڼॳՁɠࠑ܁֨ٮʴێ ॠóԺ܁ॠٕɰ.
ۋшقʪڼۼࢬ֟࣡ə֬ǴڼॳՁɠںࠑ܁ॢ
ʴێॢ֨Âʂقսॱʼؽڷ϶֬ॹ֨Ìۆ֬ۆؒ
ՙڼͪѲڹथŒأ34 dB(A)ۋؽɰ.
[16]ౖী࣡ฃԮඒ +VTU/PUJDFBCMF%JGGFSFODF
߯ՙѺজÇݓफ(JND)͈Ԑ͊ۋڼॳۍۙۆۋ εߔÁۺڷͿۍݓॣսەə߯ՙॢć࠘εϊॢ
ɰ. ˰͆ԴJNDə֬ǴυÇۙۦقۆ३ьԦॣս
ەəتۋÂڼ͟εԐ͊ۋߔÁۺڷͿۍݓॣս
ەəݓεथÀॠşڦॢşܵڷͿԺ܁ॣսەɰ.
ٍ҆ĵقԴتۋÂڼ͟ۆۍݓÀɠՁقʂॢ
şܵڷͿԐڌॢڼؓͪѲۆJNDəTable 4قǣࢍ
ǦцٮÏɰ.
[17]***֬ॹĀęфқԵ
Գଭਓଭଣේনۇ౸୨էր
Ìۆ֬Ǵড়ڼۦۆԺ࠘ق˰δڼॳՁɠѺজε
ܓԐॠČڼۼࢬ֟࣡ɾ֨Ìۆ֬ۆߔࠄঞąں؎
؉҃şڦॠيڼॳՁɠںࠑ܁ॠٕڷ϶ŔĀęε
ɰڼۆTable 5قǣࢍǴؽɰ.
ࠑ܁Āęড়ڼۦεԺ࠘ॠşۻÌۆ֬ۆۛॳ֨
ÂڹथŒأ1.59ߣۋČD
50ڹأ37.5%ۋ϶STI É ڹ0.48ےں؎սەؽɰ. ۋìڹėÂۆőϿٮʂ ԜėÂۋİԐۆڼՁۻɵՁɠۋϔڍܼڅॢÌۆ
֬ےںÇ؋ॣ˺ۛॳ֨Âڹݓǣ࠘óţČϼΒʪ (D
50, STI) əǰڹìڷͿǣࢍǣÌۆ֬Ϳۺ०ॠݓ
؍ڹڼঞąےں؎սەؽɰ. Ŕ͠ǣࠑѹقড়ڼ ۦεԺ࠘ॢۛॳ֨Âڹأ0.85ߣͿÇկॠٕČ
D
50ڹأ55.3%, STIə0.61ͿԜ֧॥ڷͿ׆ڌʪق
ҙ०ॠəڼঞąۋܓՁʼؽڼں؎սەؽɰ. ڼ
ؓͪѲۆąڍড়ڼۦεԺ࠘ॠşۻęۆठÀ
أ1.3 dB(A)ͿѺজÀϔڍۺڹìڷͿǣࢍǮɰ.
ॢठÌۆ֬Ǵսڼ۾ۆڦ࠘ق˰δڼॳۍۙۆ
߯ʂठəড়ڼۦεԺ࠘ॠşۻęقࡾóɵ
͆ݓݓ؍ؕڼں؎սەؽɰ.
ઑଲԩଣ߆ఙॺౢէր
ʂԜėÂقԴتۋȥڼ֨֟ࢰںۋڌ३ࠑ܁ॢ
ڼؓͪѲںćԓė֩قʂۓॠيتۋÂڼ͟ε
ԓॠٕڷ϶ۋεFig. 6قড়ڼۦεԺ࠘ॠşۻę
ͿĵқॠيǣࢍǴؽɰ.
ࠑ܁Āęড়ڼۦԺ࠘ۻتۋÂڼ͟ۆۼʂ ÉथŒڹأ0.42 dB(A)ͿǣࢍǮɰ. ۋəäۆϿ˜
սڼ۾قԴԐ͊ۆتޅŊقäۆʴێॢڼ͟ۆ
ڼقȃݓÀۓԐʼČەڼںۆйॢɰ. ০Ìۆ֬
ۆܟࠑфܼؖ, ڍࠑۆتۋÂڼ͟थŒۋÁÁ
-0.5 dB(A), 0.0 dB(A), 0.5 dB(A) ͿǣࢍǮəʚ, ڼڙ
+d,#Ehiruh#wkh#vrxqg#devruswlrq#wuhdwphqw +e,#Diwhu#wkh#vrxqg#devruswlrq#wuhdwphqw Ilj1#91#Wkh#uhvxow#ri#LOG#ghshqglqj#rq#wkh#devruswlrq#wuhdwphqw# +Xqlw=#gE+D,, 1
Wdeoh#81#Uhvxow#ri#urrp#dfrxvwlfv#phdvxuhphqw#ehiruh#dqg#diwhu#vrxqg#devruswlrq#wuhdwphqw1
Room Acoustics
Parameters (unit) Room Conditions
Frequency(Hz)
Average
Maximum deviation of each receiver
125 250 500 1k 2k 4k
Background Noise dB(A)
Before sound absorption treatment 12.8 15.9 21.1 22.8 23.0 25.1 34.4* - After sound absorption treatment 9.6 16.4 19.6 20.3 21.3 23.7 33.7* - RT (s) Before sound absorption treatment 1.56 1.49 1.45 1.74 1.60 1.38 1.59** 0.20
After sound absorption treatment 1.31 0.97 0.85 0.85 0.85 0.68 0.85** 0.18 SPL dB(A) Before sound absorption treatment 32.3 49.1 52.3 54.9 57.9 57.1 50.6* 3.2
After sound absorption treatment 32.3 47.2 51.6 53.0 57.1 54.9 49.3* 3.5 D
50(%) Before sound absorption treatment 29.3 41.4 42.3 35.2 34.1 42.8 37.5*** 24.7
After sound absorption treatment 33.6 65.3 50.9 59.5 56.9 65.7 55.3*** 23.1
STI Before sound absorption treatment - 0.48 0.05
After sound absorption treatment - 0.61 0.05
* Leq (equivalent noise level) , ** The average of 500 Hz to 1 kHz , *** The average of 125 Hz to 4 kHz.
ڷͿԐڌॢMLS ֪ٮÏۋٍ՚ʽڼڙقʂॢ
ڼؓͪѲ߯ՙѺজÇݓफۋأ1 dB(A)ۋ϶, ڼ؊
фϊՙνٮÏۋҝٍ՚ۺۍڼڙقʂॢ߯ՙѺজ Çݓफۋأ3 dB(A)ےںÇ؋ॣ˺ߔࠄۙəتۋ Âڼ͟εۍ֩ॣսػںìڷͿࣺɳʽɰ. ̚ॢ
ۋεࣀ३Ìۆ֬ۻߕقèߝϔڍČδъԐڼۋ
қपॠČەəìڷͿथÀॣսەɰ.
ॢठÌۆ֬قড়ڼۦεԺ࠘ॢتۋÂڼ͟
ۆۼʂÉथŒڹأ1.76 dB(A)Ϳড়ڼۦεԺ࠘ۻ
҃ɰأ1.34 dB(A)ۋݒÀ॰ɰ. ۋəتࠑѹۆড়ڼ ͳۋݒÀ॥ق˰͆֬ǴъԐڼۋ۹ÇʼرتۋÂ
ڼؓͪѲقठÀьԦॠóʼəìۋɰ. ০Ì ۆ֬ۆܟ·ܼ·ڍࠑقԴࠑ܁ॢĀęۆथŒۋڦ࠘
ѻͿÁÁ-2.2 dB(A), 0.7 dB(A), 2.1 dB(A)Ϳǣࢍǫق
˰͆Ìۆܼ֬ؖҙۆتۋÂڼ͟Ѻজəࡾݓ
؍ڹʚъ३ѹߕقۍۿॢĵًڹتۋÂڼ͟À
ࡾóѺজॢìڷͿǣࢍǮɰ.
০ܟࠑѹقÀūڏࠑ܁۾˞ۆتۋÂڼ͟
ÀڼսͿǣࢍǦìڹܟࠑ҃ɰڍࠑقԴۓԐʽ
ڼؓͪѲۋܟࠑ҃ɰ࠾ɰəìڷͿܟࠑѹقۆॢ
قȃݓ՜֬ۋٚࠑʼəĀęۋɰ. υÀݓͿڍࠑ
ѹࠑ܁۾ۆĀęÀتսͿǣࢍǦ۾ڹڍࠑѹۆ
υÇۦΒˣقۆॢڼؓͪѲۆ۹ॠͿۍ३ܟࠑ
ŊقۓԐʽڼؓͪѲۋڍࠑ҃ɰࡾɰəìںۋآ şॠəìۋ϶, ۋìڹFig. 1قǣࢍǦÀԺںۓݒ ॠəìۋɰ. ০ѹߕقÀūڏࠑ܁۾ۆʂҙқ ۋҼٍ՚ۺڼڙقʂॢ߯ՙѺজÇݓफÉۍ1 dB(A) εߣęॠČەڷ϶, تѹߕق؉ܳÀūڏࠑ܁۾
ܼێҙقԴəٍ՚ڼڙقʂॢ߯ՙѺজÇݓफۍ
3 dB(A) εߣęॠČەرԴتۋÂڼ͟εߔࠄۙ
ÀۍݓॣսەںìڷͿࣺɳʽɰ.
+d,#ehiruh#wkh#vrxqg#devruswlrq#wuhdwphqw +e,#diwhu#wkh#vrxqg#devruswlrq#wuhdwphqw Ilj1#:1#Wkh#uhvxow#ri#v|oodeoh#whvw#ghshqglqj#rq#wkh#devruswlrq#wuhdwphqw1
Ilj1#;1#Wkh#dyhudjh#ri#v|oodeoh#whvw#ghshqglqj#rq#wkh#
uhfhlylqj#}rqh1
ଣୣഓਆൈէր
֬Ǵড়ڼͳقۆ३ьԦॢتۋÂڼ͟ÀڼՁ ۍݓՁɠقй࠘əٖॳںܓԐॠşڦॠيڼۼࢬ
֟࣡ε֨ॱॠٕɰ. ɰڼۆFig. 7ڹʂԜėÂقড় ڼۦεԺ࠘ॠşۻęق֬֨ॢڼۼࢬ֟࣡Āę ε܁νॢìۋ϶, Fig. 8ڹսڼ۾ۆڦ࠘ق˰͆ĵ
ًںĵқॠيڼۼࢬ֟࣡ĀęथŒںʪ֩জॢ
ìںǣࢍǶìۋɰ.
ڼۼࢬ֟࣡Āęড়ڼۦεԺ࠘ॠşۻق֬֨ॢ
֬ॹۆ܁ɻέڹथŒأ73.1%ͿǣࢍǮڷ϶, ড়ڼ ۦԺ࠘قəأ78.0%Ϳ܁ɻέۋԜ֧ॢìڷͿ
ǣࢍǮɰ. ۋəড়ڼͳۆݒÀق˰͆Դۛॳ֨Âۋ
ܶر˞ČڼՁϼΒʪÀॳԜʽĀęͿࣺɳʽɰ.
*7تۋÂڼ͟ٮڼՁϼΒʪۆ
Ԝěěć
ઑଲԩଣ߆ఙ౸࣠րଭঃււծ
تۋȥڼ֨֟ࢰڷͿ֬ǴڼॳՁɠںࠑ܁ॠČ
ćԓė֩ںۋڌ३تۋÂڼ͟εԓॠٕɰ. ۋ εцڷͿսڼ۾ڦ࠘ѻتۋÂڼ͟Ѻজε
؎؉҃şڦ३ڼڙڷͿҙࢢۆսथäνق˰δت ۋÂڼ͟εFig. 9قŔ॒͒Ϳʪ֩জॠٕɰ. , Ŕ॒͒ۆX ߹قԴ0۾ڹڼڙۋڦ࠘ॢÌۆ֬ۆ
ܼؖҙεǣࢍǴəìۋ϶, քۙÀ࠶ݗսѹߕق
Àūڗݙںۆйॢɰ. يşԴتսəڍࠑѹ, ڼս əܟࠑѹقÀūڏìںۆйॠдͿ, սथäνۆ
ۼʂÉۋ࠶ݗսսڼ۾ۆڦ࠘ÀࠑѹقÀŲɰ əìںǣࢍǶɰ. Ŕ॒͒ۆY ߹ڹتۋÂڼ͟
ࠑ܁ĀęεǣࢍǶìۋ϶ŔÉۋتսێąڍܟ ࠑŊۆڼॳۍۙÀڍࠑŊ҃ɰࢀìۋČ, ڼսێ
ąڍڍࠑŊۆڼॳۍۙÀܟࠑŊ҃ɰʌڎࢀì ڷͿथÀॣսەɰ. ̚ॢŔ॒͒قəڼؓͪѲۆ
ق˰δ߯ՙѺজÇݓफÉںڼٖڷͿश֨
ॠيߔࠄۙÀتۋÂڼ͟εߔÁۺڷͿۍݓॣ
սەəݓقʂॢथÀşܵڷͿԘČۙॠٕɰ.
Ìۆ֬قড়ڼۦεԺ࠘ॠşۻڼڙڷͿҙࢢս थäνٮۆتۋÂڼ͟ۆԜěěćεқԵॢĀ ęԜěćս(R)Àأ0.696, ԸԜěćս(R
2) Àأ
0.484 ͿǣࢍǮɰ. ۋεࣀ३تࠑѹۆড়ڼՁɠۋ
äۆػəėÂقԴʪتۋÂڼ͟ٮѹߕͿҙࢢ
ۆäνəȭڹԜěěćقەڷǣŔٖॳۋࡾݓ
Wdeoh# 91# Fruuhodwlrq# ehwzhhq# yduldwlrq# ri# LOG# dqg#
lpsuryhphqw#lq#wkh#v|oodeoh#whvw#vfruh1 Improvement of
score
Variation of ILD Improvement of score - -0.441*
Variation of ILD -0.441* -
* Correlation coefficient significance at the 0.05 level (both sides).
Ilj1#431#Fruuhodwlrq#judsk#ehwzhhq#yduldwlrq#ri#LOG#
dqg#lpsuryhphqw#lq#wkh#v|oodeoh#whvw#vfruh1 +d,#Ehiruh#wkh#vrxqg#devruswlrq#wuhdwphqw +e,#Diwhu#wkh#vrxqg#devruswlrq#wuhdwphqw
Ilj1#<1#Frpsdulvrq#ri#LOG#dqg#glvwdqfh#ri#wkh#uhfhlyhu#iurp#wkh#vrxqg#vrxufh1
ə؍ڹìڷͿथÀॣսەɰ.
̚ॢ֬Ǵড়ڼۦԺ࠘تۋÂڼ͟ٮڼڙ ڷͿҙࢢۆսथäνقʂॢԜěěćεқԵॢĀ ęRÉۋأ0.890, R
2Éۋأ0.793ڷͿǣࢍǣ˃ۍ
ۙԐۋقϔڍȭڹսܵۆԜěěćÀՁςॠČ
ەڼں؎սەؽɰ.
ĀۺڷͿѹߕۆড়ڼͳقۆ३ࠑϸъԐڼۆ
