使用python解码DTMF

import numpy as np
from scipy.io import wavfile

# 加载音频文件
sample_rate, audio_data = wavfile.read('dtmf_signal.wav')

# 定义DTMF信号的频率
dtmf_frequencies = {
    '1': (697, 1209),
    '2': (697, 1336),
    '3': (697, 1477),
    '4': (770, 1209),
    '5': (770, 1336),
    '6': (770, 1477),
    '7': (852, 1209),
    '8': (852, 1336),
    '9': (852, 1477),
    '0': (941, 1336),
    'A': (697, 1633),
    'B': (770, 1633),
    'C': (852, 1633),
    'D': (941, 1633),
    '#': (941, 1477),
    '*': (941, 1209)
}

# 定义DTMF信号的持续时间
dtmf_duration = 0.1  # 单位为秒

# 解码DTMF信号
decoded_digits = []
for i in range(0, len(audio_data), int(sample_rate * dtmf_duration)):
    segment = audio_data[i:i+int(sample_rate * dtmf_duration)]
    frequencies = np.fft.fft(segment)
    max_frequency_index = np.argmax(np.abs(frequencies))
    max_frequency = np.fft.fftfreq(len(segment))[max_frequency_index] * sample_rate
    closest_match = min(dtmf_frequencies.keys(), key=lambda x: abs(dtmf_frequencies[x][0] - max_frequency) + abs(dtmf_frequencies[x][1] - max_frequency))
    decoded_digits.append(closest_match)

# 打印解码结果
print('Decoded DTMF digits:', ''.join(decoded_digits))