The noise induced permanent threshold shift (NIPTS) resulting from up to ten years of exposure to an L eq of 89 dBA was investigated. Prior occupational no... EH Berger - 《Journal of the Acoustical Society of America》 被引量: 61发表: 1977年 Testing the accuracy of smartphones and soun...
Convert dB, dBm, dBW, dBV, dBmV, dBμV, dBu, dBμA, dBHz, dBSPL, dBA to watts, volts, ampers, hertz, sound pressure. Set the quantity type and decibel unit. Enter the values in one or two of the text boxes and press the correspondingConvertbutton: ...
这两项研究基本上是一致的,这意味着让观众中的每个人都对回放音量满意也许是不可能的。ITU-R BS 1116–3(2015)推荐选择将一些驱动声道的组合播放级别标准化为85 dBA,数字削波前允许18 dB的余量。Bech和Zacharov(2006)评论说,他们发现对于收听典型音频素材的听音者来说,该校准水平偏高5–10 dB。 其实从上述的...
- Measure Loudness dBa SPL Noise with ease === How it works? === This app works by using your device's built-in microphone to detect the sound levels in your environment and display them in decibels. === Feedback === We're always looking to improve our app, so if you have any ...
Sones phons loudness decibel dB level dBA 0.2 - 0.3 - 0.4 - 0.5 - 0.6 define sone rating conversion dB phon phone volume intensity calculator dB dBa and sone relate volume fan theory noise rating psychoacoustics sound translate loudness level in phon dec
a宋莹莹,呵呵。 [translate] acontours below 90 dBA do contribute to the overview of the noise environment and contour gradients for levels below 90 dBA can be increased to 5 dB. 等高在90 dBA以下对噪声环境概要贡献,并且等高梯度为水平在90 dBA以下可以增加到5 dB。 [translate] ...
dBA or dB(A) (decibel A-weighted, amplitude ratio) — sound pressure with weighing filter A, referenced to sound pressure 20 μPa (human auditory threshold). Several weighing filters exist. They are intended for accurately measuring different kinds of sounds in different frequency and loudness ra...
30-130dBA Digital Noise Sound Level Meter 1.5db Accuracy Decibel Logger Tester Measurment Tool Volume Measure Instrument material: plastic International electrician committee standard: IEC PUB 651 TYPE2 US national standard: ANSI S1.4 ...
ITU-R BS 1116–3（2015）推荐选择将一些驱动声道的组合播放级别标准化为85 dBA，数字削波前允许18 ...
Type:Sound Level Meter;Measuring range:30~130dBA;Frequency range:31.5Hz~8KHz;Working Temperature and Humidity:0-40degC, 10-80%RH;Frequency weighting features:A-weighting;Material:plastic;Accuracy:+/- 1.5dB;Resolution:0.1dB;Storage Temperature and Humidit