In music, many frequencies occur simultaneously, therefore distortion tests which are relevant to music must be carried out using more than one frequency. A system is introduced for automatic swept measurement of harmonic distortion, difference frequency and intermodulation distortion in the range 2 Hz-200 kHz. The relationship of high-frequency (up to 200 kHz) IM and difference-frequency distortion to transient intermodulation (TIM) is explored. The system consists of a sweeping two-tone generator and a heterodyne analyzer phase-locked to the selected distortion components up to the fifth order. Typical dynamic range permits measurements down to 0.01 % in the harmonic and difference-frequency modes, and to 0.001% in the IM mode.
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