c++实现FSK频率采样

FSK（Frequency Shift Keying）频率采样是一种数字信号处理技术，用于将数字信号转换为模拟信号。下面是使用C++实现FSK频率采样的示例代码：

#include <iostream>
#include <cmath>
#include <vector>

const int sampleRate = 44100; // 采样率
const int bitRate = 1200; // 比特率
const int frequency1 = 1200; // 第一个频率
const int frequency2 = 2200; // 第二个频率
const int amplitude = 32767; // 振幅

std::vector<int> generateBitstream(const std::string& message) {
    std::vector<int> bitstream;
    for (char c : message) {
        for (int i = 0; i < 8; i++) {
            bitstream.push_back((c >> i) & 1);
        }
    }
    return bitstream;
}

std::vector<int> generateSamples(const std::vector<int>& bitstream) {
    std::vector<int> samples;
    for (int bit : bitstream) {
        int frequency = (bit == 0) ? frequency1 : frequency2;
        for (int i = 0; i < sampleRate / bitRate; i++) {
            double t = (double)i / sampleRate;
            int sample = amplitude * sin(2 * M_PI * frequency * t);
            samples.push_back(sample);
        }
    }
    return samples;
}

int main() {
    std::string message = "Hello, world!";
    std::vector<int> bitstream = generateBitstream(message);
    std::vector<int> samples = generateSamples(bitstream);
    for (int sample : samples) {
        std::cout << sample << std::endl;
    }
    return 0;
}

上述代码中，`generateBitstream`函数将字符串消息转换为比特流，`generateSamples`函数根据比特流生成采样数据，最后在`main`函数中输出采样数据。请注意，本代码仅作为示例，实际应用中需要根据具体需求进行修改。