中文说明：这个脚本模拟二进制频移键控。由于BFSK是一种数字调制方案，您可以根据需要调制任意多个比特。但是，我只模拟了一些位，所以结果是正确的看得见。这个是仅用于BFSK的代码，意味着它只能在两个频率上调制两个数字状态。
English Description：
This script simulates the Binary Frequency Shift keying. Since BFSK is a digital modulation scheme, you can modulate as many bits as you want. however, I have only simulated it for few bits, so that the results are visible.This is code for BFSK only, means it can only modulated two digital states on two frequencies.