Most of the current demodulation methods of 2fsk signal are in time domain.
现有解调2fsk信号的方法，大多采用时域解调的方式。
Simulations show that for a 4-symbol parallel width 2-symbol output width demodulator, the demodulation loss caused by time domain truncation in the parallel filter is about 0.6 dB.
应用该公式分析并行宽度为4个码元，输出宽度为2个码元的解调器，并行滤波的时域截断导致的解调损失约为0。
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