NOISE MEASUREMENT

This describes A and C weighting using visual and acoustical examples.

This element allows the user to change the frequency of a selection of sounds to hear the effect it has on perception. The slider superimposed on the photo of the sound source may be dragged right or left to change frequency. The up/down arrows on the "actual energy level" will increase the dB level of the sample. Buttons on the right side of the screen allow the user to change between A or C weighting.

Different sounds can be selected using the buttons arrayed at the bottom of the screen. The speaker button turns the corresponding sounds on or off. Several things need to be noted about the use of this element. There is an upper limit for sound frequency. This limitation is dictated by the method used to alter the frequency. Also, listening space dimensions, surface materials and sound reproduction equipment affect the loudness of sounds at different frequencies. An external equalizer can be used to calibrate a sound system to a specific setting.

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