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IEC 60268-17 Ed. 1.0 b:1990
Sound system equipment. Part 17: Standard volume indicators
Gives the characteristics to be specified, performance requirements and the relevant methods of measurement for electromechanical volume indicators. The concept of 'volume' is a practical way of assigning a numerical value to the magnitude of electrical speech and music programme signals.
International Electrotechnical Commission [iec]
