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.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.