Chook
Member
And of course when we are discussing dB levels associated with sound and the human ear it should be referenced to dBA which further complicates the readings. Phil you allude to this phenomenon with "perceived and actual" levels. The following is an explanation from "WWW.the engineering toolbox" on how this affects the readings and our discussion. There are other complications associated with temperature, humidity and environment but lets keep it simple.
The human ear is more sensitive to sound in the 1 to 4 kHz frequency range than to sound at very low or very high frequencies. Regarding noise - higher sound pressures are therefore more acceptable at lower and higher frequencies than in the mid range.
Knowledge about the human ear is important in acoustic design and sound measurement. To compensate for the human hearing sound meters are normally fitted with filters that adapts the measured sound response to the human sense of sound. Common filters are
Regards.......Chook.
The human ear is more sensitive to sound in the 1 to 4 kHz frequency range than to sound at very low or very high frequencies. Regarding noise - higher sound pressures are therefore more acceptable at lower and higher frequencies than in the mid range.
Knowledge about the human ear is important in acoustic design and sound measurement. To compensate for the human hearing sound meters are normally fitted with filters that adapts the measured sound response to the human sense of sound. Common filters are
- dB(A)
- dB(B)
- dB(C)
Regards.......Chook.