生成正弦信号 C#

/// <summary>
        /// 生成正弦信号
        /// </summary>
        /// <param name="f0">frequency in Hz 模拟信号的频率, 单位Hz</param>
        /// <param name="phi">initial phase 初始相位 (0-2π)</param>
        /// <param name="A">amplitude 振幅</param>
        /// <param name="fs"> sample rate 采样频率(个/秒)</param>
        /// <param name="time">生成x秒的数据</param>
        /// <returns>x秒的正弦信号</returns>
        public float[] GenerateSinData(float f0, float phi, float A, int fs, int time)
        {
            float ffs = (float)fs;
            int N = fs * time;
            float T = 1 / ffs;  //T是 采样周期, 两个样本之间的间隔时长
            var nn = new float[N];  // Math.arange(N); // [0,1,..., N-1]
            for (int i = 0; i < nn.Length; i++)
            {
                nn[i] = (float)(A * Math.Sin(2 * f0 * Math.PI * i * T + phi));
            }

            return nn;
        }