• ???????????
• ???????????????????????
• ???????????
• ????????????

??????????????????????????????????????? WH0301?93
??1.????????????÷?Χ
????????????漲????????????????????????????????????????.
??????????????????????????豸????????????????????OK??????????????.
??2.??????
??????GB3241????????????1/1??1/3??????????
??????GB3661????????????????????
??????GB3785??????硢???????????????
??????GB3947???????????
??????GB4959???????????????????
??????GYJ25????????????????????
??3.????
??3.1??????sound reinforcement system
??????????????????????????????????????????
??3.2???vacant auditoria
?????????????????????????,??????й???????.?????,??????????????????????????????????.
??3.3????????maximum sound pressure level
????????????????????????????
??3.4??????????maximum available gain
??????????????????????????????????????????6dB???????.
??3.5 ??????acoustic feedback
??????????????????????????????????????????????????????????Х???????????.
??3.6??????????transmission frequency characteristic
?????????????????????????????????????????????????????????豸????????????????
??3.7????????hound]transmission gain
?????????????????????????,???????????????????????????????????????????????
??3.8???????????sound field normniformity
?????????????,??????????????????????????????????С?????,???????.
??3.9????????background noise
?????????????????????,??????????????????????????????.
??3.10??????over all noise
????????????????????????,??????????????????,?????????????????????????
??3.11?????system distortion
??????????????????????????????????????в??????????????:????????????????????????????????????,?????????????????????????????????????,?????????????г??????????????????檔
??3.12???????reverberation time
??????????????,??????????,????????????60dB????????
??4.????????????????????????
?????????????(?????????????????????????????????)
???????л?????????????????
??4.1??????????0K???????????????????????????,
?????????????
?????????????????(dB)?????????????????? ??????????? ????????dB??A??????
?????????100~6300Hz??103dB40~12500Hz??80~8000Hz???????????0dB,????+4~-8dB,????80~8000Hz????????4dB ??125~4000Hz????????????-6dB 100Hz??10dB1000Hz??8dB63000Hz??8dB 35 5%
??????????(???????OK????125~4000Hz??98dB63~8000Hz??125~4000Hz???????????0dB,????+4~-10dB,????125~4000Hz???????+4dB125~4000Hz????????-6dB1000Hz??8dB4000Hz??8dB40 10%
??????????????OK??(????OK????250~4000Hz??93dB100~6300Hz??250~4000Hz???????????0dB,????+4~-10dB,????250~4000Hz???????+4~-6dB 250~4000Hz????????-10dB1000Hz??12dB4000Hz??12dB????OK????????40 13%
??4.1??????????0K???????????????????????????,
?????????????
?????????????????(dB)??????????? ???????? ???????????????????dB(A)????
????????? 100~6300Hz??103dB
40~12500Hz??80~8000Hz?????????0dB??????+4~-10dB,????80~8000Hz????????4dB125~4000Hz????????-8dB100Hz??10dB1000Hz??8dB6300Hz??8dB407%
??????????125~4000Hz??98dB63~8000Hz??125~4000Hz???????????0dB,????+4~-10dB,????125~4000Hz????????4dB. 125~4000Hz????????-10dB1000Hz??8dB4000Hz??8dB40 10%
?????????? 250~4000Hz??93dB 100~6300Hz??250~4000Hz???????????0dB,????+4~-10dB,????250~4000Hz??????+4~-6dB 250~4000Hz????????-10dB1000Hz??8dB4000Hz??8dB 4513%
???????????????????????????????????????????
?????????????????????????????????????????????????
??4.1???????????????????????????????
?????????????
????????? ????????(dB)??????????? ???????? ???????????????????dB(A) ????
????????? 100~6300Hz??110dB 40~12500Hz??80~8000Hz?????????0dB??????80~8000Hz????????4dB125~4000Hz????????-8dB100Hz??10dB1000Hz??8dB6300Hz??8dB 40 7%
?????????? 125~4000Hz??103dB 63~8000Hz??125~4000Hz???????????0dB,????+4~-10dB,????125~4000??z????????4dB. 125~4000Hz????????-10dB1000Hz??8dB4000Hz??8dB45 10%
???????:
??????????????????????????,??????????9??B???????,????????????????????110dB????.
??????????????????????????????????,?????????.
??4.4?????????????????????
????????????????????????????????????.
??4.4.1???????????????к??????????????????????????,???????????ó????????????????????????????.
??4.4.2???????????(T60)?????A.
??4.4.3????繃???????
???????????????????????????????,??????????????????????????,?????????????????????????15dB.
??5.????????
??5.1????????
??5.1.1??????????豸?????????????????????,????????????,??????????????????
???????:????????????,???????????????????????
??5.1.2?????,???????е?????????????????"??"λ??,??????????????????????е????????????λ?á?
??5.1.3?????,?????????????????????????,??????15dB??????????????????????????35dB???5.1.4???????????????????·????С?
??5.1.5???в????????1.5m???,?????????1.2~1.3m????????￥????????,????????￥??????
??5.1.6????????????????,?????????4?9?????????????????????????????????????￡?100??????μ?????4??,??????1???.l00~200????????6??200????????????P????????????????????
???????:???????????????????????,??????????????
??5.2?????????????????????????????????????????
??5.2.1???????????
??5.2.1.1????Χ:20~20000Hz?0.5dB.
??5.2.1.2??г?????:??????0.3%??
??5.2.2????????????
??5.2.2.1???????????????z20~20000Hz.??????????????????1.5dB.
??5.2.2.2??????????60dB??
??5.2.3????????
??5.2.3.1????Χ:20~20000Hz,????????????0.5dB.
??5.2.3.2??г?????:??????0.5%??
??5.2.3.3??????:??С??50W??
??5.2.4?????????
????????GB3661???漲?????
??5.2.5?????
????????GB3241???漲?????
??5.2.6???????GB3785??I???????????
??5.2.7?????????
??5.2.7.1????Χt20~20000Hz,????????????0.5d???A
??5.2.7.2??г?????:??????0.5%.
??5.2.8?????????
??5.2.8.1????Χ:20~20000Hz.
??5.2.8.2?????????Χ:0.1%~10%.
??5.2.9???????
??5.2.9.1????Χ:100~10000Hz,???????????6dB.
??5.2.9.2??г?????:??????5%??
??5.2.9.3??????:10W???????>90dB??.
??5.2.10????????????
??5.2.10.1????Χ:100~8000Hz??
??5.2.10.2???????????Χ:0.3s~10s??
??5.2.11???????????????????????????????????,??????????????5.2.5?????????????????????????????????????衣
??5.3???????
??5.3.1????[????]???????
??5.3.1.1???????????????2???????,????????????:
??????a???????????,???1/30ct??????????,??????????????,??????????????????5.1.3?????
??????b?????1/30ct?????????????????,?????????ε?????,??????????????????????????????????????????????
??????c???????????????Χ?????,????????1/30ct??????????
??????d????????5.1.5????5.1.6?????С?
???????:?????????????????????,?????÷????????????????2????????????,?????????????????????,??????????????????????????????????????????
??5.3.1.2???????????????3???????,????????????:
??????a?????????????,??????????????,?????????????檔
??????b??????????????????????0.5m??
??????c???????????,???1/30ct??????????,??????????????,?????????????15dB.
??????d?????l/30ct?????????????????,????????????????????????????????????????????????????
??????e???????????????????????????
??????f???????????????Χ?????,????????1/30ct??????????.
??????g????????5.1.5????5.1.6??????.?:?????????????????????,?????÷?????????????(?3??????????),?????????????????
?????? ?????????????????,???????????????????????????????????????????
??5.3.2????????
??????????????
?????????5.3.1.2???????????????????,??????????????????????????????????????????????,????????????????????????????.????????????????5.3.1.2??,???????????????????????
??5.3.3????????
??5.3.3.1??????
???????????????2,?????????5.3.1.1??,????????????????????????????ù???????????????????1/K??K=2~10????????
?????????????????????Χ???????????????1/30ct????????,???????????????Χ??????????,?????20LgK??????????
????????????????????????????????????????? ???zLi???i??1/30ct????????,N?????????Χ??1/30ct?????.
??5.3.4???????????
??????????5.3.1??????????,??????????????????????????????б????????????????????????
??5.3.5??????
??????????????????????С?
??????????????????????豸,??????硢???μ???????????豸?????????豸?????????????????.
?????????5.1.5????5.1.6??????.
?????????????????????λ???5.3.1.2??????????????????63~8000Hz??Χ?????????????.????????????????????????????????????. ??????????????A???????.
???????:???????????????,??????????豸,?????????????,?????????????A??????????????????????????NR???5,????????????NR=A??????5.
??5.3.6??????????????4?????
????????????????????????????,??????????????????????????????????????????ù???????????????????l/K??K=2~10?????????????500Hz,1000Hz,2000??????????????????????????????????г????????г?????????,г??????M?????????
??????????L??????????????????????????,L2??L3????????г????????г???????????
?????????????,??????????????????????,????????2m??.
??5.3.7???????
???????????????2,?????????????????????????????????????????????????????????????????
???????????????????l/30ct???????????????????????????????????????????????,???????????????5.1.3?????????????????????????в???????????????????????в???,????????????????????.
???????????????????,????????????????????????????
???????????????????????125Hz,250Hz,500Hz,1000Hz,2000Hz,??4000Hz????