Question

我在做matlab作业的时候有这样一句话看不懂是什么意思，请大神帮我解释一下。详情见问题补充。

Create a sinusoidal signal of frequency 3kHz that is sampled at 16 kHz with a
maximum amplitude of 2. Use the function you wrote in PART 2 to estimate the
frequency and amplitude of the signal you created.

Answer 1

3kHz 频率的正弦函数，其幅值最大为2 采样频率为16kHz

追问

Create a signal (MATLAB array) corresponding to a sinusoid of frequency 2kHz that
is sampled at 8 kHz and plot its magnitude and phase spectra using the function you
wrote in PART 1.
上面那道题和这道有什么区别吗

Answer 2

创建一个频率为3kHZ，幅值为2，采样率为16kHz的正弦函数
并利用你在PART2里面写的那个matlab函数估计你创建的这个正弦函数的频率和幅值

追问

Create a signal (MATLAB array) corresponding to a sinusoid of frequency 2kHz that
is sampled at 8 kHz and plot its magnitude and phase spectra using the function you
wrote in PART 1
这两道题有什么区别吗？

追答

这个的抽样频率是8kHZ，然后这个要让你用你在PART1里面写的matlab程序求画出该正弦函数的幅度-频率图，就是频谱图

追问

那题目要求都差不多啊，不都是对一个正弦信号进行采样吗？题目中说estimate不也应该是画出相应的的幅度-频谱图吗？有啥区别？

追答

额……可能想让你多重复几遍熟悉过程吧