Which organization defines the algorithm for loudness measurement used in broadcast?

Which organization defines the algorithm for loudness measurement used in broadcast?

• A. ITU-R BS.1770
• B. EBU R128
• C. SMPTE 2067
• D. AES67

Answer: (A)

Understanding loudness measurement in broadcast begins with recognizing where the actual measurement method is defined. The standard that specifies how loudness is calculated, including the weighting (K-weighting), how to compute short-term, momentary, and integrated loudness, and how gating is applied, is ITU-R BS.1770. This algorithm provides the core method meters use to produce LUFS/LKFS values that broadcasters rely on. European practice frequently references EBU R128, which builds on that BS.1770 algorithm and sets targets (like -23 LUFS integrated) and how to apply measurements in broadcasting, but the defining algorithm itself comes from ITU-R BS.1770. The other standards mentioned relate to different areas or applications and do not define the loudness measurement method.

Understanding loudness measurement in broadcast begins with recognizing where the actual measurement method is defined. The standard that specifies how loudness is calculated, including the weighting (K-weighting), how to compute short-term, momentary, and integrated loudness, and how gating is applied, is ITU-R BS.1770. This algorithm provides the core method meters use to produce LUFS/LKFS values that broadcasters rely on.

European practice frequently references EBU R128, which builds on that BS.1770 algorithm and sets targets (like -23 LUFS integrated) and how to apply measurements in broadcasting, but the defining algorithm itself comes from ITU-R BS.1770. The other standards mentioned relate to different areas or applications and do not define the loudness measurement method.