The amount of reduction for a given envelope, or modulation, frequency has been called the modulation transfer function (MTF) and can be derived from the impulse response of the transmission channel [Schroeder, M.R. (1981) Modulation transfer-functions: Definition and measurement, Acustica, 49, ...
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(the measurement value with regard to the public address speaker sound source), early decay time (EDT): 4.04s; 3.76s, reverberation time (RT60): 3.58s; 3.89s, clarity (C80): 鈭 6.2dB; 鈭 2.8dB, definition (D50): 18%; 29%, initial time delay gap (ITDG): 47ms; 23ms, and ...