Measurement of nonlinear distortions in tape recorders and electro-acoustic transducers applying T.I.M. test signals

Measurement procedures for transient intermodulation distortions (TIM) have been extended and applied to magnetic tape recorders, high-frequency loudspeakers and microphones. The tests proved as a good measure for high-frequency compression distortions in tape recorders. Squarewave/ sine test signals can be used for unified VU-meter calibration in tape recorders and for specification of peak-power handling of high-frequency loudspeakers (tweeters). Thermally forced fluctuation in the sound pressure of tweeters is described.