在Java中生成正弦波时背景噪声

import org.apache.commons.math3.complex.Complex;
import org.apache.commons.math3.transform.DftNormalization;
import org.apache.commons.math3.transform.FastFourierTransformer;
import org.apache.commons.math3.transform.TransformType;

public class SineWaveGenerator {
    public static void main(String[] args) {
        int sampleRate = 44100; // 采样率
        double frequency = 440.0; // 正弦波频率
        int duration = 5; // 正弦波持续时间（秒）

        int numSamples = sampleRate * duration; // 采样点数
        double[] sineWave = new double[numSamples];

        for (int i = 0; i < numSamples; i++) {
            double time = (double) i / sampleRate;
            sineWave[i] = Math.sin(2 * Math.PI * frequency * time);
        }

        // 使用Apache Commons Math库进行快速傅里叶变换
        FastFourierTransformer fft = new FastFourierTransformer(DftNormalization.STANDARD);
        Complex[] fftResult = fft.transform(sineWave, TransformType.FORWARD);

        // 输出FFT结果
        for (int i = 0; i < fftResult.length; i++) {
            System.out.println("Frequency: " + (double) i / numSamples * sampleRate + " Hz, Magnitude: " + fftResult[i].abs());
        }
    }
}