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1、Optimal Sound Matching Solution through Helmholtz resonator theory,卓坦瞒雕皑嘴却足送秃蟹弃梦兴骗粉琴什简谣聘狮甘聋惋驶峙络乡晓瘁霍手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Basic theoryHelmholtz Resonator was invented for sound analysis by H.VON Helmholtz(18211894)Its applications are various from bell,violin,guitar and bass speaker cabinet.It f
2、eatures shorter neck and volume bottle than wave as shown below.Specific frequency depends on air volume in neck(weight)and volume in the bottle(spring)So specific frequency is calculated as below.a:Necks area()V:Resonator volume()L:Necks length(m)C:Sound velocity(344m/s)Therefore any shapes of reso
3、nator is not affecting Resonant Frequency.If the volume&necks length is same,the resonator has same resonant frequency even in different shape.,Basic principle,Optimal Sound Matching Solution through Helmholtz resonator theory,悦湖烹令揉讨莆亭别体卖食钓乐绸镇珠讹肥砾鲤屎术芳租止终立苔臆狂顽手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Ex.1)Whats the
4、 resonant frequency in case of a bottle with outer dia.9.8cm,neck length10cm,neck outer dia.3cm?,Example,Optimal Sound Matching Solution through Helmholtz resonator theory,歌慕意至段略忆队撅赛泳轰参莹枕急讲治晃嘛稍畴战付馋嚣搐王渺姑恤览手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,2.Application(1)Inside structure of handset,a:Hole total area(m2),L:C
5、ase thickness(m),V:Front volume(m3),C:344 m/s(RT 20),Application,Optimal Sound Matching Solution through Helmholtz resonator theory,宛入荐奄陵价钙鸥同屏脏云蒋淡请普戴蓬慌蜘勇巡鬼辖炮痈慌薛沾炉武拜手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,(2)Example model:SS1534P-008-SIZE:15mm X 3.4 H-Fo:850 Hz-Ze:8 ohm(3)Test conditions*Input power:0.1W at 5cm,B
6、asic principle,Optimal Sound Matching Solution through Helmholtz resonator theory,牛嘎对扣辐柴薄咏靶凹澄倚雾镶主斟堕劈动螟几舆牛纯肘瘁冻互躲锹吾屎手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,SS1534P-008 GRAPH in BAFFLE,Original test result,Optimal Sound Matching Solution through Helmholtz resonator theory,脚梧擅释僵每碍塌频颤某蝉艘段做扑崔汁弃杯愚鼎澳霓冕咬琴盈津撰繁门手机音腔及出音孔的设计
7、计算手机音腔及出音孔的设计计算,(4)TEST according to some variations Basic Structure Air Hole quantity variation Case thickness variation Front Volume variation Back Volume variation,Test condition,Optimal Sound Matching Solution through Helmholtz resonator theory,寇毯娄漳片瘟场爬驮淄痔堰喂芋札揖捍欢珍勉许杜难早拥嗜财网悉某顶仑手机音腔及出音孔的设计计算手机音腔及出
8、音孔的设计计算,Basic structure a:1.55mm X 4 ea L:1.55mm V:1.2cc C:344 m/s(RT 20)Back volume:2.42cc,=3,486Hz,Basic structure,Hand Set Matching Solution with Helmholtz resonator,痘愤袜刽块嚼竿祥晦阿蹦簿璃淄龚伴佃赊丛媚术屏糖刷疤朝移茧隔膏随杉手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,X:3.0000kHz Y:104.23dB ZA:Live Curve TSR fund.,B,K,Mode:TSR,A:Frequency
9、Response,Magn dB re 20.00,Pa/V,100,200,500,1k,2k,5k,10k,Hz,60,70,80,90,100,110,dB,3,486Hz 3,000Hz,Test result,Optimal Sound Matching Solution through Helmholtz resonator theory,躇鄂昼币脂哮竖缮怯况凡新临袜舔舷育框醇疵苇锄秤众明脓陆滚淀寐澳些手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Air Hole quantity variation a:1.55mm X 4 ea 1.55mm X 2 ea L:1.55
10、mm V:1.2cc C:344 m/s(RT 20)Back volume:2.42cc,=2,465Hz,Air hole variation,Optimal Sound Matching Solution through Helmholtz resonator theory,网锈涧芯雌疫程鄂霜胞烈酥冀庸奢死役碴销钻劣赃再湾跋岁妙淮狗浚吩释手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Test result of air hole changed,Hand Set Matching Solution with Helmholtz resonator,郊扁崎浇立顶瞅呼涩逢戒弊臀图戌灸
11、肌入煤层欠墒挡泄抛挑筏乌禾支堡冕手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Case thickness variation a:1.55mm X 4 ea L:1.55mm 2.5mm V:1.2cc C:344 m/s(RT 20)Back volume:2.42cc,=2,745Hz,Case thickness changed,Optimal Sound Matching Solution through Helmholtz resonator theory,菏豺炭俊被水惶蹈疆邹际后昧刘附盆截川沥白艳倦特衫痈癣查喉凡磕酉乡手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,
12、Test result by case thickness variation,Optimal Sound Matching Solution through Helmholtz resonator theory,雄籍笑躇箩策恃勒皿镑黔谎毁玄娱错肩佣灸邀妓迟服磨奔围粳锣巾掖邯测手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Front Volume variation a:1.55mm X 4 ea L:1.55mm V:1.2cc 0.8cc C:344 m/s(RT 20)Back volume:2.42cc,=4,269Hz,Front volume variation,Optim
13、al Sound Matching Solution through Helmholtz resonator theory,桃兴颗寸幢啮散输漂汞嘱窑捡旁躯婶疑峙匣桔盔私寂堑寝垄家撵碎涤以懂手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Test result by front volume variation,Optimal Sound Matching Solution through Helmholtz resonator theory,书桐刮缆蚕法迟猎饰头蓖负埂牛件苏矽厦洛哀仿嗅裔倪扒吭桓时铺腋彰抱手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Back Volume var
14、iation a:1.55mm X 4 ea L:1.55mm V:1.2cc C:344 m/s(RT 20)Back volume:2.42cc 1.5cc,Back volume variation,Optimal Sound Matching Solution through Helmholtz resonator theory,跑渤埠曰掩韦乖往豢主蜜橇园踏峨物斡芜侥毒筒封瓮骗辈阂歉肾层货启搐手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,B,K,Mode:TSR,A:Frequency Response,Magn dB re 20.00,Pa/V,100,200,500,1k,
15、2k,5k,10k,Hz,60,70,80,90,100,110,dB,X:1.3000kHz Y:96.65dB ZA:Live Curve TSR fund.,Loss of low sound,Test result by back volume changed,Optimal Sound Matching Solution through Helmholtz resonator theory,品决刹珐饱犬侧技崇兆抓鲁怀釉跑舜磕柄哨礼赤本目蛇谜葱段萄席墒惠婆手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,3.Conclusion We come to conclusion thro
16、ugh proved theory as follows:1)The quantity of front air hole,Resonant Frequency 2)Front case thickness,Resonant Frequency 3)Front volume,Resonant Frequency 4)Back volume,Low sound Optimal acoustic solution in handset design can be coming from Helmholtz resonator theory.In case that speaker itself h
17、as flat frequency response,specific resonant frequency is generating when being mounted in the handset.Then SPL and sound quality is depending on how the resonant frequency is met with.In conclusion the optimal resonant frequency should be set between 2KHz and 5KHz because these area is most sensiti
18、ve one for human ear.,Analysis&Conclusion,Optimal Sound Matching Solution through Helmholtz resonator theory,驼匪椰舒掇浆袖龋奎藐最枣令恋巾锁汉犬阜遏狭壮膊淄徊笺厚惑仕埃怂烂手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,HANDSET Design considerations for Optimal Sound Matching 1.The bigger back volume in speaker,the rich sound at low frequency.2.Sound
19、 leakage at front cover is causing decreasing sound at low frequency.3.The bigger sound hole in handset,the clearer sound.4.Should be designed for no interference in between front and back bouncing sound from the speaker,Handset design application,Optimal Sound Matching Solution through Helmholtz resonator theory,秩乙此协胸宗逾斯样窄狞是揍描弓噶折管教款堪舆逸柞捂锋暮引退破枝余手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,Handset design application,Optimal Sound Matching Solution through Helmholtz resonator theory,痒衡围弱掇肪馏鞘侵胞鸥盒域熔彻宛帛茵阁钧锹诀部貌叼件盈呢书婿慢婿手机音腔及出音孔的设计计算手机音腔及出音孔的设计计算,
