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4.3
Terms to know
1.
Sound Pressure Level
The sound is defined as pressure variations in the air which is generally quantified by the
sound pressure. Sound Pressure Level (SPL) is a weighted sum of the frequency components
of acoustic signals. SPL is expressed in decibels (dB SPL).
2.
SLM (Sound Level Meter)
Sound Level Meter indicates the Sound Pressure Level (SPL) as measured by the Product.
3.
Frequency Spectrum
Frequency Spectrum is the distribution of the amplitudes (dB SPL) of each frequency
component against frequency (Hz). In other words: Your signal recording consists of different
frequency components which all contribute to the sound.
4.
Spectrogram
Spectrogram can show a sudden onset of a sound. Often it can be easier to see clicks and
other glitches in this view rather than in a time or spectrum analysis.
5.
Field of view (FOV)
Horizontal/Vertical observation angels of the webcam. The FOV depends on how many
features are opened (Spectrum, Spectrogram and dB SPL meter). When opening more
features on the Sorama CAM iV64 screen, the horizontal FOV will increase and the vertical
FOV will reduce slightly.
No features open: Horizontal FOV 23.8° and Vertical FOV 41°
All features open: Horizontal FOV 53° and Vertical FOV 38.2°.
6.
Beamforming
A signal processing technique used to identify the location of sound by using an array of
microphones. The localization of sound is determined by the difference in time at which
sound reaches the microphones in the array.
7.
Frequency and Time Weightings
When measuring sound pressure level variations, it is important that the sound level meter
can give an accurate representation of what the human ear hears. Frequency weightings are
used to correlate the SPL at each frequency component for different applications. Frequency
weightings that can be applied are Z, A, B and C.
The streaming SPL varies rapidly in time on display, time weightings act like a buffer for
desired time-engagement. The time weightings that can be applied are Impulse, Fast and
Slow.
8.
Frequency Band Selection
Frequency band selection acts like a window, focusing on the selected frequency range in the
spectrum, the frequency ranges of the sound, other than the selection are filtered out and
not visible on the display.
