The transient distortion of a loudspeaker may be measured by intermittently applying sine-wave bursts, consisting of four or sixteen cycles each, to the speaker. Each burst starts with the wave going through zero degrees and ceases, after the desired number of cycles has been counted off, with the wave once again crossing the zero axis. Each burst is followed by an -off- period whose duration is equal to that of the burst; the burst is then repeated. A microphone situated in front of the loudspeaker is gated to measure the sound -hangover- during the -off- period. A curve is then drawn of this transient hangover as a function of frequency. The correlation of the curve thus obtained with listening tests is discussed.
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