【多选题】Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks? ()
A.
The three required steps in the analog to digital conversion are sampling, encoding, and compression.
B.
The three required steps in the analog to digital conversion are sampling, quantization, and compression.
C.
The three required steps in the analog to digital conversion are sampling, quantization, and encoding.
D.
The output of the sampling process is a pulse code modulation (PCM) signal.
E.
The output of the sampling process is a pulse amplitude modulation (PAM) signal.
【单选题】________ or voice-input devices accept spoken words through a microphone and change the sounds into computer readable signals.
【单选题】— Why do you drink so much tea? — Well, _____ it doesn't keep me awake in the nights. [ ]
【单选题】边坡病害体治理稳定性分析标准中,等级为II的边坡,发生整体失稳的概率为()
【简答题】What is the emission designation for MF/HF voice signals?A. FIB. B. J3E. C. J2B. D. F3E.
【单选题】Distress signals may be().
【单选题】Why do the middle-aged people prefer tea according to the author?
A.
They become practical and want to save money.
B.
They like the faint and lingering fragrance of the Chinese tea.
C.
Coffee is too bitter for them to drink.
D.
Hot tea is good for their health.
【单选题】Why is the tea set important?
A.
A good tea set can reflect the color, aroma and taste of tea.
B.
While enjoying tea, it is also helpful to appreciate the fine tea set.
C.
Tea sets are the father of tea.
【单选题】The telephone contains a transmitter and receiver for converting back and forth analog voice and analog electrical signals.