Glossary definition of 'Peak Program Meter'
(PPM)
An audio meter designed to measure and display the peak level of an audio signal. Originally a BBC standard dating back to 1938, it has a peak-like response with a 1.7ms attack time and 650ms decay time. This meter is defined in IEC 60268-10. A version for monitoring digital signals is also defined in IEC 60268-18.
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