計(jì)算揚(yáng)聲器聲壓級(jí)公式

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,"Version1.0

AcousticCalculator

聲學(xué)計(jì)算器ByFreemanLoo",,,,,,,,,,,,,,,

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,A聲壓級(jí)(SPL)計(jì)算器,,,,,,,,,,,,,,,

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,揚(yáng)聲器靈敏度(1W@1m),,100.0,dBSPL,,,,,,,,,"

聲學(xué)計(jì)算器應(yīng)用指南：

點(diǎn)擊右上角的名稱按鈕A~M會(huì)跳至相應(yīng)的計(jì)算器。計(jì)算器中白色單元格為可輸入?yún)^(qū)域，輸入后請(qǐng)使用鼠標(biāo)點(diǎn)擊附近灰色區(qū)域確認(rèn)。請(qǐng)注意綠色說(shuō)明文字。部分內(nèi)容翻譯自DoctorProAudio網(wǎng)站，希望對(duì)音響初學(xué)者有所幫助。

Freeman@Oct2008",,,

,額定功率(AES/ANSI),,500,Watts,相對(duì)于,,1,W功率的SPL增量,,27.0,dB,,,,,

,最大聲壓級(jí)(@1m),,127.0,dBSPL(RMS功率輸出),,,133.0,dBSPL(峰值功率輸出),,,,,,,,

,揚(yáng)聲器數(shù)量,,4,,相對(duì)于,,1,個(gè)揚(yáng)聲器的SPL增量,,6.0,dB,,,,,

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,到揚(yáng)聲器距離,,1,米(Meters),相對(duì)于,,1,米處的SPL衰減值,,0.0,dB,,,,,

,理論計(jì)算總聲壓級(jí),,133.0,dBSPL,,,,總SPL增減量,,33.0,dB,,,,,

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,,"以上計(jì)算為理論值，不包含聲音在空氣中的傳播損耗和揚(yáng)聲器的功率壓縮（加載(受熱)后的聲壓級(jí)下降）影響。

功率壓縮：

當(dāng)音箱進(jìn)入工作狀態(tài)（譬如等于或大于滿功率20秒之后），音圈和磁體受熱溫升后、由于它們性能下降改變了受熱前單元的原有特性，這時(shí)，實(shí)際的聲壓輸出就會(huì)減少，常規(guī)音箱，如音圈溫升60度-80度，常見額定聲壓級(jí)下降3dB為容限，如音圈散熱優(yōu)異，耐溫達(dá)100度以上，實(shí)際的聲壓下降可達(dá)6至8dB。",,,,,,,,,,,,,,

,B揚(yáng)聲器組總聲壓級(jí)(SPL),,,,,,,,,C聲音空氣傳播損耗,,,,,,

,揚(yáng)聲器1聲壓級(jí)SPL1,,,96.0,dBSPL,,,空氣溫度,,23.0,攝氏度°C,,,,,

,揚(yáng)聲器2聲壓級(jí)SPL2,,,96.0,dBSPL,,,空氣相對(duì)濕度,,45.0,%,,,,,

,揚(yáng)聲器3聲壓級(jí)SPL3,,,,dBSPL,,,頻率,,8000.0,赫茲(Hz),,,,,

,揚(yáng)聲器4聲壓級(jí)SPL4,,,,dBSPL,,,計(jì)算距離,,26.0,,,,,,

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（dB@距離）",,,,,,,,

,2,個(gè)揚(yáng)聲器總聲壓級(jí)(自由相位),,99.01,dBSPL,,,,,2.67,dB,,,,,

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,揚(yáng)聲器組總聲壓級(jí)計(jì)算公式,,,,,,,,,,,,聲音空氣傳播損失參考圖,,,

,D限幅器啟動(dòng)閥值Threshold計(jì)算,,,,,,,,,,,,,"

Left","

Right",

,揚(yáng)聲器連續(xù)額定功率(AES/ANSI),,,1200.0,Watts,,功率放大器額定功率,,,950.0,Watts,,功放輸入電壓,200,200,mV

,揚(yáng)聲器阻抗（Impedance）,,,8.0,Ohms,,功率放大器的負(fù)載阻抗,,,8.0,Ohms,,功放輸出電壓,9.08,9.08,V

,,,,功率放大器電壓增益,,,45.40,,,33.10,dB,,功放電壓增益,45.40,45.40,倍數(shù)（x）

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,揚(yáng)聲器最大電壓負(fù)載,,,97.98,Volts,,功率放大器最大輸出電壓,,,87.18,Volts,,"限幅器

啟動(dòng)閾值",1.92,1.92,Volts

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,,,限幅器啟動(dòng)閥值,,,,1.92,Volts,7.88,dBu,,,,7.88,7.88,dBu

,,"限幅器參量調(diào)節(jié)：Attack啟動(dòng)時(shí)間調(diào)節(jié)在2ms和100ms之間

Release釋放時(shí)間調(diào)節(jié)在Attack值的5和10倍之間

Ratio壓縮比高于10:1",,,,,,,,,,說(shuō)明：將100Hz正弦波信號(hào)送入功放，輸入電壓為輸入卡儂插頭2、3之間的電壓，輸出電壓為斷開音箱狀態(tài)下功放輸出端測(cè)得的電壓。功放增益旋鈕必須打到滿刻度位置。,,,,

,E天花喇叭覆蓋范圍計(jì)算,,,,,,,,,,,,F聲音傳播速度SpeedofSound,,,

,天花喇叭覆蓋角度,,,90.0,度(Degrees),,,,,,,,,,,

,房間高度,,,3.0,米(Meters),,,,,空氣溫度Temp,,,20.0,攝氏度°C,,

,,,,按聽眾坐立高度計(jì)算,,,坐立高度按1.2米高度計(jì)算,,,,計(jì)算公式：Speed=331.3+0.606*temp,,,,,

,覆蓋直徑,,,3.60,米(Meters),,,,,聲音傳播速度Speed,,,343.4,米/秒,,

,覆蓋面積,,,10.18,平方米(SquareMeters),,,,,,,,1126.6,Feet/S,,

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,上述結(jié)果按照理論聲速343m/s(1125ft/s)計(jì)算,,,,,,,,,,,,,,,

,,G時(shí)間<<>>距離轉(zhuǎn)換計(jì)算器,,,,,,,,,,,,,,

,,時(shí)間(Time),10.0,毫秒(ms),距離(Distance),,,3.434,,,,H房間共振頻率計(jì)算,,,,

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,,,聲音速度,343.4,m/s,,"說(shuō)明：輸入距離值前，請(qǐng)先按下三角形按鈕選擇距離

單位，可選單位為米、厘米、英尺、英寸。",,,,,房間尺寸,長(zhǎng)度,寬度,高度,

,,（聲音速度從自計(jì)算器F引用）,,,,,,,,,,,Length,Width,Height,

,,距離(Distance),3.434,米(Metres),,,,,,,,,16.6,8.0,4.0,m

,,,343.4,厘米(CentiMetres),,,,0.0100,秒(Seconds),,,i,Pi,Qi,Ri,

,,,11.266,英尺(Feet),時(shí)間(Time),,,10.0,毫秒(Miliseconds),,,1,10.4,21.5,42.9,Hz

,,,135.197,英寸(Inches),,,,10000,微秒(Microseconds),,,2,20.7,43.5,85.9,Hz

,,,,,,,,,,,,3,31.1,65.2,128.8,Hz

,,I頻率<<>>波長(zhǎng)轉(zhuǎn)換計(jì)算器,,,,,,,,,,,,,,

,,,,,,,,,,,,4,41.5,86.9,171.7,Hz

,,頻率(Frequency),100.0,赫茲(Hz),波長(zhǎng),,,15.000,,,,5,51.8,108.7,214.6,Hz

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,,,聲音速度,343.4,m/s,,"說(shuō)明：輸入距離值前，請(qǐng)先按下三角形按鈕選擇距離

單位，可選單位為米、厘米、英尺、英寸。",,,,,,Pi=(聲速/2*Length)*i,,,

,,（聲音速度從自計(jì)算器F引用）,,,,,,,,,,,Qi=(聲速/2*Width)*i,,,

,,波長(zhǎng)(WaveLength),3.434,米(Metres),,,,,,,,,Ri=(聲速/2*Height)*i,,,

,,,343.4,厘米(CentiMetres),,,頻率,2289.3,赫茲(Hz),,,,說(shuō)明：本計(jì)算公式中的聲音速度從自計(jì)算器F引用。,,,

,,,11.266,英尺(Feet),,,,,,,,,,,,

,,,135.197,英寸(Inches),,,,,波長(zhǎng)=速度/頻率,,,,,,,

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,,JQ值<<>>BW(帶寬)轉(zhuǎn)換計(jì)算器,,,,,,,,,K頻譜上的BW(帶寬)和Q值計(jì)算,,,,,

,,Q值,4.40,,BW(帶寬),,0.33,Oct(倍頻程),,,中心頻率,,54.0,Hz,,

,,,,,,,,,,,高端頻率(-3dB),,65.0,Hz,,

,,BW(帶寬),0.33,Oct(倍頻程),,Q值,4.36,,,,低端頻率(-3dB),,44.86,Hz,,

,,,,,,,,,,,帶寬Bandwidth,,0.54,Octaves,,

,,,,,,,,,,,Q值,,2.68,,,

,備注：當(dāng)Q值為4.4時(shí)，其帶寬等于1/3倍頻程（相當(dāng)于31段圖示均衡器每段帶寬）。,,,,,,,,,,,,,,,

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,,LdBu<<>>dBV<<>>Volts(RMS電壓)轉(zhuǎn)換計(jì)算器,,,,,,1,,,,,,,,

,,dBu,1.00,,dBV,,1.00,,電壓（Volts）,1.000,,,,,,

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,,dBV,-1.21,,dBu,,3.21,,dBu,2.21,參考電壓0.775V,,,,,

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,,電壓（Volts）,0.870,電壓（Volts）,,,1.122,,dBV,0.00,參考電壓1.000V,,,,,

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,,,,,,,,,dBm,2.22,參考功率1mW@600Ohms,,,,,

,,"備注：第三列輸入的電壓（Volts）值必須大于0，否則計(jì)算結(jié)果會(huì)出錯(cuò)！

dBu為電壓值與參考電壓V0=0.775VRMS（阻抗不限）的邏輯對(duì)數(shù)值。V0=0.775Volt≡0dBu

dBV為電壓值與參考電壓V0=1.000VRMS（阻抗不限）的邏輯對(duì)數(shù)值。V0=1.000Volt≡0dBV

dBm為功率值與參考功率P0=1.000MilliWatt的邏輯對(duì)數(shù)值。P0=1.000MilliWatt≡0dBm（參考負(fù)載阻抗600歐姆）",,,,,,,,,,,,,,

,,,M國(guó)際常用錄音電平參考值,,,,,,,,,,,,,

,,,電平,,,dB,,,電壓(RMS),,,,,,,

,,,國(guó)際錄音電平-USA,,,

+4dBu,,,1.228V,,,,,,,