DIN 45631 PDF
Find the most up-to-date version of DIN at Engineering Calculation of loudness level and loudness from the sound spectrum – Zwicker method – Amendment 1: Calculation of the loudness of time-variant sound. DIN /A Calculation of loudness level and loudness from the sound spectrum – Zwicker method – Amendment 1: Calculation of the loudness of .
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Two sone has double loudness compared to one sone. A famous psychoacoustics effect is acoustical masking. The noise includes acoustic noise from the environment and noise in the measurement chain from the microphone or preamplifier.
Loudness Sone A wideband noise has a different subjective loudness than a pure tone at the same level measured in dB A. Since the human ear is very sensitive, such measurements require high quality measurement equipment. A complete measurement system for sone contains the following components: If you use a sound level calibrator with 94dB, the reference level has to set to 82dB.
With a distance of 25cm the correction factor is 12dB. It is ideally in the judgment of air conditioners or typical PC noise like hard disks of fans.
A result was a model for the human hearing. All psycho acoustic analysis requires absolute sound levels.
Loudness measurement in sone (DIN ISO B)
Many sone measurements include analysis of low noise devices e. Most people will agree that the sound of a flute is much nicer than a drill used by dentist although they both might have the same loudness. Nobody would expect to hear the sound of a mouse during a symphonic orchestra, although the mouse would audible in quiet phases. The normal measurement distance is dni.
As mentioned previously, sone is valid for stationary signals only. For complex sounds and noise, this simple model is not valid anymore.
Simply switch off the measurement device. The reference level is one sone, which is equivalent to a tone with 445631 at a level of 40dB.
ISO 532 B / DIN 45631 Loudness
The frequency response of the ear depends on the sound level, that is the reason for different curves, which are valid for a certain level only.
In a normal office environment at a quiet noise level of 45dBA it is impossible to analyze a fan with 25dBA.
The research work around from Barkhausen result into the well known A,B,C weighting curves. Only parts of the signal, which are audible according to a model, are stored. This approximation is only valid in the far-field with spherical radiation. You can improve the measurement sensitivity by reducing the measurement distance from 1m to e. A wideband noise has a different subjective loudness than a pure tone at the same level measured in dB A.
In addition, you have to calibrate the system. This increases the signal level by 12dB. Zwicker analyzed various psychoacoustics effects thoroughly.
ISO B / DIN Loudness
However, in practice sine tones are not very common.