Signal Generation And Parameter Analysis Of Loudspeaker Power Test

With the developing of electro-acoustic industry,the speaker has become an indispensable part in people's entertainment activities.At the same time,consumers demand more about speaker sound quality,some auditors even pursue Hi-Fi.It must through the numerous parameters measurement,analysis and modify before it is implemented,then we can get perfect speaker sound quality.During the test,first of all,it needs to input test signal for the speaker that will be tested,and the signal is more accuracy,the result is more accuracy.So the study of signal generation and the speaker parameters measurement are equally important.The paper mainly studies the test signal generation and speaker parameters analysis of speaker power test system,the work is as follows:The first part,adopt the method of mixed programming between MATLAB and C++to generate speaker power test signal,such as white noise,pink noise,simulation program signal,continuous logarithmic frequency sweep signal,linear frequency sweep signal and so on.Analyze parameters of these signals,and compare the analysis results of test signal with the standard signal to verify the exactness of the signal.Use feedback shift register to generate another test signal,pseudo random signal.Then employ professional randomness test method to test the random inspections of pseudo random signal,in order to make sure it has enough randomness,eventually applied in speaker power test system.The second part,design the digital equalizer to equalize the test signals.Based on a1/3 oct graphic equalizer that designed by slope filter,to design input and output digital equalizer.Use it for speaker power test system,then tests its equilibrium effect.The third part,analyze the TS parameter.Employ Lagrange polynomial interpolation algorithm for solve the low-frequency harmonic frequencyf_s and maximum impedance Z_{ma x} of impedance curve,further obtain three quality factors that areQ_{m s},Q_es and Q_ts.Compare the methods that interpolation with the direct use of RMS function,to verify the interpolation method's reliability and stability.Figures:68,Tables:10,References:64...