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为了测量系统或网络的频率特性或进行参数辨识,往往需要有一个宽频带的信号作为激励。该文建议可选用multitone信号达到这个目的。与过去常用的扫谱信号Chirp或白噪声信号相比,它更易准确掌控。文中分析和讨论了multitone信号的特性、发生方式及应用中的某些实际问题,给出了频域和时域测量中的2个电路应用示例,并指出用适当带宽的multitone信号作为线性系统的激励,通过它与系统响应做互相关运算就可求得系统的冲激响应。该过程无须进行反卷积运算,属于时域内的直接求解方法。对于线性系统,multitone信号在其频率特性测量和参数辨识方面,应具有较好的应用前景。
In order to measure the frequency characteristics of a system or network or to identify parameters, it is often necessary to have a wideband signal as an excitation. This article suggests multitone signals for this purpose. It is easier to control accurately than the usual Chirp or white noise signal used in the past. This paper analyzes and discusses some characteristics of multitone signals, how they occur and how to use them, and gives examples of the application of two circuits in frequency and time domain measurements. It also points out that using a multitone signal with appropriate bandwidth as a linear system Incentives, through it and the system response to do cross-correlation operation can get the system’s impulse response. This process does not need to carry on the deconvolution operation, belongs to the direct solution method in the time domain. For linear systems, multitone signals should have good application prospects in terms of frequency characteristics measurement and parameter identification.