科研之友
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摘要
Nonlinear distortions are measured at the end of the assembly line to check the loudspeaker system and make a pass/fail decision. However, the responses of single components and their total harmonic distortion have a low diagnostic value because they are difficult to interpret and do not reveal the particular cause of a defect. A new measurement technique is presented which measures the nonlinearities of the motor suspension system directly. The results are single-valued parameters (such as voice-coil offset in millimeters) which are related directly to the geometry and the large-signal parameters of the loudspeaker system. The measurement is only based on the measurement of the electric signals at the loudspeaker terminals, thus providing full robustness against ambient noise. The accuracy of the measurement results is investigated while performing measurements using short stimuli of between 0.2 and 1.3 seconds. New possibilities for on-line diagnostics during end-of-line testing and the integration into production control to increase production yield are discussed.
- 出版日期2010-3
