脉搏频率 meaning in Chinese

frequency of pulsatin
pulse frequency

In this part the signal from the infrared sensor was amplified by common collector amplifier , and the demodulator was built by filter . in which the signal got demodulated . because we just need the frequency of the signal , filter may achieved
通过信号通路,传感器生成的调幅波信号转变为与脉搏频率相同的方波。先由运算放大器接共集电极电路完成信号放大,通过滤波得到脉搏信号的频率,从而用滤波器电路完成了解调功能。