转换数据

在时域和频域之间变换数据

函数

`fft`	`iddata` 对象的快速傅里叶变换 (FFT)
`ifft`	将 iddata 对象从频域转换为时时域
`etfe`	Estimate empirical transfer functions and periodograms
`spa`	Estimate frequency response with fixed frequency resolution using spectral analysis
`spafdr`	利用频谱分析估计频率响应与频谱，该分析具有频率依赖性分辨率

示例和操作指南

Transform Time-Domain Data in the App
Transform time-domain data to frequency-domain or frequency-response data.
Transform Frequency-Domain Data in the App
Transform frequency-domain input-output data to time-domain or frequency-response data.
Transform Frequency-Response Data in the App
Transform frequency-response data to frequency-domain input-output data or to frequency-response data with a different frequency resolution.

概念

Supported Data Transformations
Transform between time-domain and frequency-domain data at the command line.
时域和频域数据之间的转换
在命令行上在时域和频域 iddata 对象之间进行转换。
Transforming Between Frequency-Domain and Frequency-Response Data
Transform between iddata and idfrd objects at the command line.