.

Then, what is A and C weighting?

The "A" weighted sound level discriminates against low frequencies, in a manner similar to the response of the ear. The "C" weighted sound level does not discriminate against low frequencies and measures uniformly over the frequency range of 30 to 10,000 Hz.

Beside above, what is meant by dB A? A-weighted decibels, abbreviated dBA, or dBa, or dB(a), are an expression of the relative loudness of sounds in air as perceived by the human ear. In the A-weighted system, the decibel values of sounds at low frequencies are reduced, compared with unweighted decibels, in which no correction is made for audio frequency.

In this regard, what is decibel ABC?

Decibel - Decibel is a logarithmic unit used to describe the ratio of a signal level - like power or intensity to a reference level. Doppler Effect - The change in frequency of sound due to relative motion between source and listener.

Should I use A or C weighting?

Although the A-Weighted response is used for most applications, C-Weighting is also available on many sound level meters. C Weighting is usually used for Peak measurements and also in some entertainment noise measurement, where the transmission of bass noise can be a problem.