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  • ?????豸

    ???λ??:???>???????>???????????????????????
    ??????KTV???????
    ??????????????????????????????????????? WH0301?93
    ??1.????????????÷?Χ
    ????????????涨????????????????????????????????????????.
    ??????????????????????????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??????????????????档
    ??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????绷???????
    ???????????????????????????????,??????????????????????????,?????????????????????????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???涨?????
    ??5.2.5?????
    ????????GB3241???涨?????
    ??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?????????????,??????????????,?????????????档
    ??????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????
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