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本文描述的是以微处理机为基础的语言码的测量系统.在这个系统中,是用补偿的方法,使CODECS在非零时延和非单位增益下测量,因此,就可以用差分放大器的方法(即简单的从输出中扣除输入的方法),获得误差信号.本系统对输入信号和误差信号都可测出,并且可将两者的均方根值计算出来.用分贝表示出的这些数的比值,就是测量的结果.任意的输入信号都可以使用,但是,由于本系统是有意为通信CODECS而设计的,因此,频率范围限制在3100赫以内,信噪比能测到70dB
Described here is a microprocessor-based language code measurement system in which compensation methods are used to allow CODECS to be measured at non-zero delay and non-unity gain so that differential amplifier Method (ie, simply subtracting the input from the output) to obtain the error signal, which can be measured both for the input signal and for the error signal, and to calculate the rms values for both The ratio of the number is the result of the measurement. Any input signal can be used, but because the system is designed for communication CODECS and therefore, the frequency range is limited to 3100 Hz, the signal to noise ratio can be measured 70dB