20  Audio Measurements

Weighting Curves

The French CCIR 468–4 is universally adopted for measurements of noise in audio systems. It is shown in Figure 113. The ‘unweighted’ response curve is needed to avoid the effects of inaudible components which may be present. The A-weighting curve using similar scales is shown in Figure 114 for comparison. The tables give precise values and tolerances.

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Figure 113  CCIR 468–4 noise weighting curves

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Figure 114  A weighting curve (IEC179)

The use of Special dB Suffices in Audio Engineering

Note: A suffix ...

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