The A Weighting Network
The A weighting network is a frequency domain correction applied to acoustic measurements.
It implements an approximate inverse of Fletcher and Munson's 0 phon equal loudness contour,
such that signals which have been filtered by the A weighting network show some correlation with perceived LOUDNESS.
The response is shown in the graph below
The response is normalised to 0 dB at 1 kiloHertz.
Values of the A weighting network's response, in deciBels, at octave band centre frequencies, are tabulated below.
A sub-set of the A Weighting filter's poles and zeros is used to give another important weighting network,
widely used in the measurement of acoustic signals;
The C Weighting Network
the magnitude frequency response of which is plotted in the figure below
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