用 python写一个sstv编码器
时间: 2023-07-18 11:34:25 浏览: 103
好的,下面是一个基于Python的SSTV编码器的示例代码:
```python
import numpy as np
import scipy.signal as signal
import sounddevice as sd
import time
# 定义SSTV编码器类
class SSTVEncoder:
# 定义常量
BLACK = 0
RED = 1
YELLOW = 2
GREEN = 3
CYAN = 4
BLUE = 5
MAGENTA = 6
WHITE = 7
SYNC_PULSE_FREQ = 1200
SYNC_PULSE_DURATION = 3000
HORIZONTAL_SYNC_FREQ = 1500
HORIZONTAL_SYNC_DURATION = 10
VERTICAL_SYNC_FREQ = 1900
VERTICAL_SYNC_DURATION = 20
SAMPLE_RATE = 44100
BITS_PER_SAMPLE = 16
CHANNELS = 1
# 定义图像尺寸和编码方式
def __init__(self, image, mode="Martin1"):
self.image = image
self.mode = mode
self.width, self.height = image.shape
# 发送同步脉冲
def send_sync_pulse(self):
t = np.linspace(0, self.SYNC_PULSE_DURATION/1000, int(self.SYNC_PULSE_DURATION*self.SAMPLE_RATE/1000), False)
pulse = np.sin(2*np.pi*self.SYNC_PULSE_FREQ*t)
return pulse
# 发送水平同步脉冲
def send_horizontal_sync_pulse(self):
t = np.linspace(0, self.HORIZONTAL_SYNC_DURATION/1000, int(self.HORIZONTAL_SYNC_DURATION*self.SAMPLE_RATE/1000), False)
pulse = np.sin(2*np.pi*self.HORIZONTAL_SYNC_FREQ*t)
return pulse
# 发送垂直同步脉冲
def send_vertical_sync_pulse(self):
t = np.linspace(0, self.VERTICAL_SYNC_DURATION/1000, int(self.VERTICAL_SYNC_DURATION*self.SAMPLE_RATE/1000), False)
pulse = np.sin(2*np.pi*self.VERTICAL_SYNC_FREQ*t)
return pulse
# 发送一个像素
def send_pixel(self, color):
# 声音频率和持续时间
if self.mode == "Martin1":
# Martin1编码方式
freq = [1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900]
time = 22.9
else:
# 其他编码方式
freq = [1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900]
time = 30.0
if color == self.BLACK:
freq1 = freq[0]
freq2 = freq[1]
elif color == self.RED:
freq1 = freq[2]
freq2 = freq[3]
elif color == self.YELLOW:
freq1 = freq[4]
freq2 = freq[5]
elif color == self.GREEN:
freq1 = freq[6]
freq2 = freq[7]
elif color == self.CYAN:
freq1 = freq[0]
freq2 = freq[3]
elif color == self.BLUE:
freq1 = freq[4]
freq2 = freq[7]
elif color == self.MAGENTA:
freq1 = freq[1]
freq2 = freq[6]
elif color == self.WHITE:
freq1 = freq[2]
freq2 = freq[5]
# 生成两个正弦波
t = np.linspace(0, time/1000, int(time*self.SAMPLE_RATE/1000), False)
wave1 = np.sin(2*np.pi*freq1*t)
wave2 = np.sin(2*np.pi*freq2*t)
# 混合两个正弦波
wave = (wave1 + wave2) / 2
return wave
# 发送一行像素
def send_line(self, line):
# 发送水平同步脉冲
pulse = self.send_horizontal_sync_pulse()
sd.play(pulse, self.SAMPLE_RATE)
# 发送像素
for pixel in line:
wave = self.send_pixel(pixel)
sd.play(wave, self.SAMPLE_RATE)
# 发送垂直同步脉冲
pulse = self.send_vertical_sync_pulse()
sd.play(pulse, self.SAMPLE_RATE)
# 发送整个图像
def send_image(self):
# 发送同步脉冲
pulse = self.send_sync_pulse()
sd.play(pulse, self.SAMPLE_RATE)
# 发送每一行像素
for line in self.image:
self.send_line(line)
# 示例用法
if __name__ == '__main__':
# 生成一个随机图像
image = np.random.randint(0, 8, (320, 240))
# 创建SSTV编码器
encoder = SSTVEncoder(image)
# 发送图像
encoder.send_image()
# 等待发送完成
time.sleep(5)
```
请注意,这只是一个简单的示例代码,实际使用时需要根据具体的应用场景进行修改和优化。
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