A- and C-Weighting Filters
- Updated2024-06-07
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A- and C-Weighting Filters
An A-weighting filter is a highpass filter designed to simulate the loudness of low-level tones. An A-weighting filter progressively de-emphasizes frequencies below 500 Hz. A C-weighting filter removes sounds outside the audio range of 20 Hz to 20 kHz and simulates the loudness of high-level tones.
The ANSI S1.4 standard defines the frequency responses of the A- and C-weighting filters. The following figure shows the relative attenuation defined for A- and C-weighting filters.
Note Each of the A- and
C-weighting filters has a relative attenuation of 0 dB at 1,000 Hz.