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Extra resources for Environmental and architectural acoustics

Example text

4), are used. 4 Frequency characteristics of octave-band pass filter (IEC 61260). 3 8 10 often used in various evaluations required in architectural acoustics, mainly in laboratory measurements. c. Real-time analyser When the signals change rapidly in both amplitude and frequency, they can be processed simultaneously through all the filters covering the frequency range concerned by means of a real-time analyser and the output fed to a continuous display on a screen. The latter can display a series of instantaneous octave or 1/3 octave-band spectra, which are renewed many times per second.

17 Ogive of speech level distribution at 1/8 s interval. e. the samples that exceed that level expressed as a percentage of the total. This characteristic is shown to be common to both male and females and also for any language. It shows that the long-term average level is only exceeded for 20% of the time while a level over +12 dB occurs about 1% of the whole time and the level difference between maximum and minimum levels (dynamic range) is found to be 45–55 dB. Referred to the average value, there is a variation from +40 dB for shouting to −40 dB as a minimum level.

B9). 3 4 The NCB number of a noise can be determined by plotting the noise in octave-band levels on the NCB curves. The lowest curve, which is not exceeded in any of the octave bands, is the NCB rating of the particular noise. 5 for the environmental assessment. This method is useful because any information relating to frequency, necessary for noise reduction purposes, can be easily extracted. These values are applicable for background noise under the condition of all the facilities in operation in the room.

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