functions to 0 dB at 1 kHz, as they are typically used. (This normalization is shown in the image.) See also Noise Signal noise ITU-R 468 noise weighting M-weighting Psophometric weighting Audio quality measurement Noise pollution Noise regulation Headroom Rumble measurement Weighting filter Weighting curve Luminosity function, the light equivalent LKFS Notes References Further reading Audio Engineer's Reference Book, 2nd Ed 1999, edited Michael Talbot Smith, Focal Press An Introduction to the Psychology of Hearing 5th ed, Brian C. J. Moore, Elsevier Press External links Noise Measurement Briefing. Archived from the original on 2013-02-25. A-weighting filter circuit for audio measurements Weighting Filter Set Circuit diagrams AES pro audio reference definition of "weighting filters" Frequency Weighting Equations A-weighting in detail A-Weighting Equation and online calculation Researches in loudness measurement by CBS using noise bands, 1966 IEEE Article Comparison of some loudness measures for loudspeaker listening tests (Aarts, JAES, 1992) PDF containing algorithm for ABCD filters Noise pollution Sound Audio engineering Noise Articles containing video clips Acoustics de:Bewerteter Schalldruckpegel fr:Décibel A ja:A特性