FreeDATA/modem/cw.py

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import numpy as np
"""
morse code generator
MorseCodePlayer().text_to_signal("DJ2LS-1")
"""
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class MorseCodePlayer:
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def __init__(self, wpm=25, f=1500, fs=48000):
self.wpm = wpm
self.f0 = f
self.fs = fs
self.dot_duration = 1.2/(self.wpm)
self.dash_duration = 3*self.dot_duration
self.pause_duration = self.dot_duration
self.word_pause_duration = 7*self.dot_duration
self.morse_alphabet = {
'A': '.-', 'B': '-...', 'C': '-.-.', 'D': '-..', 'E': '.', 'F': '..-.', 'G': '--.', 'H': '....',
'I': '..', 'J': '.---', 'K': '-.-', 'L': '.-..', 'M': '--', 'N': '-.', 'O': '---', 'P': '.--.',
'Q': '--.-', 'R': '.-.', 'S': '...', 'T': '-', 'U': '..-', 'V': '...-', 'W': '.--', 'X': '-..-',
'Y': '-.--', 'Z': '--..', '0': '-----', '1': '.----', '2': '..---', '3': '...--', '4': '....-',
'5': '.....', '6': '-....', '7': '--...', '8': '---..', '9': '----.', '.': '.-.-.-', ',': '--..--',
'?': '..--..', "'": '.----.', '!': '-.-.--', '/': '-..-.', '(': '-.--.', ')': '-.--.-', '&': '.-...',
':': '---...', ';': '-.-.-.', '=': '-...-', '+': '.-.-.', '-': '-....-', '_': '..--.-', '"': '.-..-.',
'$': '...-..-', '@': '.--.-.'
}
def text_to_morse(self, text):
morse = ''
for char in text:
if char.upper() in self.morse_alphabet:
morse += self.morse_alphabet[char.upper()] + ' '
elif char == ' ':
morse += ' '
return morse
def morse_to_signal(self, morse):
signal = np.array([], dtype=np.int16)
for char in morse:
if char == '.':
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duration = self.dot_duration # Using class-defined duration
t = np.linspace(0, duration, int(self.fs * duration), endpoint=False)
s = 0.5 * np.sin(2 * np.pi * self.f0 * t)
signal = np.concatenate((signal, np.int16(s * 32767)))
pause_samples = int(self.pause_duration * self.fs)
signal = np.concatenate((signal, np.zeros(pause_samples, dtype=np.int16)))
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elif char == '-':
duration = self.dash_duration # Using class-defined duration
t = np.linspace(0, duration, int(self.fs * duration), endpoint=False)
s = 0.5 * np.sin(2 * np.pi * self.f0 * t)
signal = np.concatenate((signal, np.int16(s * 32767)))
pause_samples = int(self.pause_duration * self.fs)
signal = np.concatenate((signal, np.zeros(pause_samples, dtype=np.int16)))
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elif char == ' ':
pause_samples = int(self.word_pause_duration * self.fs)
signal = np.concatenate((signal, np.zeros(pause_samples, dtype=np.int16)))
pause_samples = int(self.pause_duration * self.fs)
signal = np.concatenate((signal, np.zeros(pause_samples, dtype=np.int16)))
return signal
def text_to_signal(self, text):
morse = self.text_to_morse(text)
return self.morse_to_signal(morse)