问题
单项选择题
According to Shannon's equation, what is the channel capacity of an analog voice-grade phone line with a bandwidth of 3100 Hz and a signal-to-noise ratio or 30 dB
A．9.1 Kbps
B．9.3 Kbps
C．30.9 Kbps
D．30.17 Kbps
答案
参考答案：D