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A Loudness Monitor for broadcasting has been developed by CBS Laboratories under joint sponsorship with the CBS Broadcast Group and is currently undergoing field tests. The Monitor uses the CBS Laboratories equal-loudness contours, the Loudness Level Summation Method described previously by Bauer and Torick,  and a revised ear ballistics characteristic. The steady-state calibration of the Monitor is in decibels re 1 mW into 600 Ω at 1000 Hz. The indications of the loudness level of program are in loudness level units (LU).