Samples in generating a given signal

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Ara Liz
Ara Liz 2021-6-14
回答： Scott MacKenzie 2021-6-14
We have to generate 128 samples of sinusoid with frequency of 3000 Hz, amplitude of 0.8 and sampling rate is 8000 Hz. The correct codes were:
>> Fs = 8000;
>> t = [0:127]/Fs;
>> y = 0.8*sin(2*pi*3000*t);
>> plot(t,y);
I just want to know why is it 127 and not 128? Thank you so much in advance :)

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回答（1 个）

Scott MacKenzie
Scott MacKenzie 2021-6-14
There are 128 values in the vector [0:127]:
0, 1, 2, 3, ... 126, 127
If the vector was defined using the term 128, as in your question, there would be 129 terms:
0, 1, 2, 3, ... 127, 128

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