生成一个信号源模拟器的代码

以下是一个简单的信号源模拟器代码，可以生成正弦波、方波和三角波信号：

import numpy as np
import matplotlib.pyplot as plt

# 生成正弦波信号
def generate_sine_wave(freq, duration, sample_rate):
    time = np.arange(0, duration, 1 / sample_rate)
    amplitude = np.sin(2 * np.pi * freq * time)
    return time, amplitude

# 生成方波信号
def generate_square_wave(freq, duration, sample_rate):
    time = np.arange(0, duration, 1 / sample_rate)
    amplitude = np.sign(np.sin(2 * np.pi * freq * time))
    return time, amplitude

# 生成三角波信号
def generate_triangle_wave(freq, duration, sample_rate):
    time = np.arange(0, duration, 1 / sample_rate)
    amplitude = np.abs(scipy.signal.sawtooth(2 * np.pi * freq * time, 0.5))
    return time, amplitude

# 测试生成的信号
sample_rate = 44100
duration = 2

time, sine_wave = generate_sine_wave(440, duration, sample_rate)
time, square_wave = generate_square_wave(440, duration, sample_rate)
time, triangle_wave = generate_triangle_wave(440, duration, sample_rate)

plt.plot(time, sine_wave)
plt.plot(time, square_wave)
plt.plot(time, triangle_wave)
plt.legend(['Sine', 'Square', 'Triangle'])
plt.show()

这个代码使用了 NumPy 和 Matplotlib 库来生成并绘制信号。你可以根据需要调整参数，如频率、持续时间和采样率，以生成不同类型和不同属性的信号。