A、Most often causes exist before the problem.
B、Effects tend to occur after the problem has arisen.
C、Effects of an event can be the causes of another event.
D、Causes of an event cannot be the effects of another event.
A、Most often causes exist before the problem.
B、Effects tend to occur after the problem has arisen.
C、Effects of an event can be the causes of another event.
D、Causes of an event cannot be the effects of another event.
An analog signal is sampled, quantized and encoded into a binary PCM wave. The number of representation levels used is L=32768. A synchronizing bit is added at the end of each codeword representing a sample of the analog signal. The resulting PCM wave is transmitted over a channel of bandwidth BT=28 (kHz), using a binary PAM system with raised-cosine spectrum, where the roll-off factor is a=0.75. Then, the information is transmitted at the rate Rb=____ (bps) through the channel. The analog signal is sampled at the rate fs= (Hz). The maximum possible value for the highest frequency component of the analog signal is fH= (Hz).
A、Rb=32k, fs=2k, fH=1k
B、Rb=32k, fs=4k, fH=2k
C、Rb=48k, fs=2k, fH=1k
D、Rb=48k, fs=4k, fH=2k
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