![]() The meter will automatically store the LAeq, Lavg, LCeq, LPeak and a few others parameters. When you are happy that you have measured for long enough (the average has settled for example), simply press the Stop key. The meter will start measuring the Leq, Lavg and Peak (the main parameters needed for occupational noise), along with a few other useful parameters. This process is the same for any model of this meter, whether you have data logging or not. To start a measurement, simply press the Start key, shown on the right. The NoiseTools software takes the octave band measurements and calculates the level at the ear when using different hearing protectors. When noise levels are very high, you need to be sure that the hearing protectors that are being used are adequate. The meter measures in all bands at the same time, storing the octave spectrum every second or every 1/2 second. This version of the Optimus Red meter also has Real-Time (or "parallel") Octave Band Filters. This audio is transferred to the software automatically along with the measurement. The meter will record any speech or the noise in question (to help you identify it later) for up to 30 seconds. Make a brief recording (either your voice or the actual noise) just before taking a measurement.īefore starting a measurement, the meter will ask if you want to record a "Voice Tag". This is particularly useful when monitoring for long periods.Īn easy and reliable way of making on-site notes with your noise measurements. It stores the Leq (A, C and Z) and the Peak (C and Z), giving a very informative graph of the noise over time. Time History - The meter can be set to store time history measurements at one of a number of rates between 10 ms and 2 seconds. They include the Max and Min values for all frequency and time weightings, along with the all important Leq (A, C and Z weighted) and Peak (C and Z weighted). Summary - These "overall" values describe the noise for the whole measurement period. Normalized octave band averages are computed and compared with the commonly performed octave band averages.Although the display shows only the commonly used parameters (Leq, Lavg, Peak, etc), the meter stores the sound levels for all time and frequency weightings, along with a time history for the more common ones and the octave band spectra. The details revealed by this higher frequency resolution also allow one to identify the expected influence of the dimensions of the subjects, the mouth opening and the contribution of the nasal cavity to the sound radiation. ![]() In order to investigate to what extent and in which frequency range this variability is actually due to differences in directionality, directivity patterns are computed in narrower frequency bands with constant width. However, a part of the observed variability may be due to the averaging process itself, which is influenced by the spectral differences between the different speech sounds. Due to the variability of the physical mechanisms of speech production, the radiation patterns differ between different speech sounds. Speech directivity is most often quantified by averaging in octave bands the speech production of real subjects recorded simultaneously at different locations with microphone arrays in anechoic environments. It is gaining interest for the rendering of speech in three dimensional environments (real or virtual), but it is also related to more fundamental research questions, such as the intelligibility with competing speech (cocktail party problem). Abstract : Speech directivity induces variations of the amplitude and spectrum of the radiated sound with the direction.
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