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本文讨论了把扬声器看作线性稳态系统时,求在频域中,描述扬声器动态特性的系统函数的方法。线性稳态系统的系统函数由振幅频率特性和相位频率特性表示,相位频率特性又用群延迟频率特性表示。在本文中,提出了同时测量振幅频率特性和群延迟频率特性的方法,尤其对于扬声器那样的振幅频率特性激烈变动的系统,讨论了测量的可能性。根据同时测量振幅频率特性和群延迟频率特性的原理,研制了系统函数的测量装置,并证实了它的实用性。
This paper discusses the method of describing the system function of loudspeaker dynamics in the frequency domain when the loudspeaker is considered as a linear steady-state system. The system function of the linear steady-state system is represented by the amplitude frequency characteristic and the phase frequency characteristic, which in turn is represented by the group delay frequency characteristic. In this paper, a method of simultaneously measuring amplitude frequency characteristics and group delay frequency characteristics is proposed, especially for systems where the amplitude and frequency characteristics of the loudspeaker fluctuate drastically. The possibility of measurement is discussed. According to the principle of simultaneously measuring amplitude frequency characteristics and group delay frequency characteristics, a measuring device of system functions was developed and its practicability was proved.