What does the A-weighted term mean?

[mitrobge]

what does the A-weighted term mean?

 

[dwayne22]

Re: 120 dB, A-weighted

A-weighting is a filtering of the subject signal (such as noise) to approximate human hearing. Try using Google with "A-weighting"

It is often used in audio to specify noise levels, since the human ear is less sensitive to high and low frequencies.

Sometimes also noise from things like fans. Generally makes noise numbers lower than a flat, brick wall response. So the produce appears better ...

 

[castrader]

120 dB, A-weighted

for audio band 20-20kHz, gain is about 0dB
other band, gain is attenuated much.
a-weighted @1kHz gain=0dB 1kHZ<signal<5kHz gain>0dB, max gain is about 2-3dB, other range gain<0dB