Stefan Kiessling – organist
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Noise Calculations

Noise Calculations


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This calculator focuses on the noise that appears in the audio signal chain. The various noises sum up to a resulting noise in the final audio. Depending on the situation some noises have almost no influence on the result. For instance in most cases the preamp noise does not increase the noise sum, as the room noise and microphone noise is much higher.
All dB values should refer to the A-weighted value.

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Show explanation of Pa, V, dB, dBu, dBV, dB FS…

Shows


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Introduction (simplified)
Introduction (prof.)
Set gain as high as possible?
Recording quiet sources
Volume control: digital or analogue?
Set gains using a table (universal gain).

Sound Source

Min and max sound pressure level emitted by this sound source, measured at a distance of  m. Sound pressure level emitted by this sound source
min: dB SPL  max: dB SPL
Distance to sound:
 m
Room noise:
 dB SPL
26 – 92 dB SPL
Microphone
Pattern / Angle / Distance fact.:
Sensitivity: mV/Pa
Impedance: Ω
Eqv. Noise: dB SPL
max. SPL: dB SPL
Preset :
-95.8 – -29.9 dBu
Attenuator (PAD)
Attenuation none
-95.8 – -29.9 dBu
Preamp
max. Input: dBu
Noise (EIN): dBu
Gain: +12 dB
Preset :
-83.8 – -17.9 dBu
Analog-Digital-Converter
Reference Level: dBu
max dB FS: dB FS
Dynamic Range: dB
Resolution: bit
-101.7 – -35.9 dB FS
Noise reduction
Fader
±0 dB
dB SPL
-101.7 – -35.9 dB FS
Digital-Analog-Converter
Dynamic Range: dB
Reference Level @0dBFS: dBu
Preset :
-77.6 – -11.9 dBu
Active Monitor
Input gain control: dB
Input level for 100 dB SPL output in 1 m distance: dBu
Noise in 1 m distance: dB SPL
Preset :
Distance to ear:
 m
Noise in the
listening room:
 dB SPL
Ear
–20 dB SPL –10 dB SPL ±0 dB SPL +10 dB SPL +20 dB SPL +30 dB SPL +40 dB SPL +50 dB SPL +60 dB SPL +70 dB SPL +80 dB SPL +90 dB SPL +100 dB SPL +110 dB SPL +120 dB SPLmax. Miclevelmax. Preampinputmax. ADClevelmax. dBFSlevelmax. DAClevelResulting Noise floorRoom NoiseListening roomNoiseMic.NoiseDAC NoiseADC NoisePreamp NoiseMonitor NoiseDyn. range:63.7 dB (12 bit)max Sound levelMax. dyn. range: 99.6 dB (18 bit)Headroom: 35.9 dB (7 bit)
Measures after Noise reduction, as a function of the preamp gain.
 
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