The Public Radio Satellite System adopted standards Thursday intended to normalize audio levels among the programs it distributes to stations. PRSS adopted an audio measurement standard using a number to denote audio levels, instead of the longtime industry standard of peak meters. Decibel measurements provided by meters are largely subjective. The loudness unit adopted by PRSS is used by organizations around the world. Because PBS also uses it, joint licensees can now rely on a single standard, which will simplify operations, according to the PRSS working group that approved the change.