As an experienced technician， you are responsible for Technical Support. A customer calls to askthe best signal level and noise level for cell phone. How to respond？（） A: -40dBm signal and -90dBm noise B: -50dBm signal and -90dBm noise C: -30dBm signal and -90dBm noise D: -20dBm signal and -90dBm noise
As an experienced technician， you are responsible for Technical Support. A customer calls to askthe best signal level and noise level for cell phone. How to respond？（） A: -40dBm signal and -90dBm noise B: -50dBm signal and -90dBm noise C: -30dBm signal and -90dBm noise D: -20dBm signal and -90dBm noise
In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（） A: the signal to noise of the current optical amplifier B: the signal to noise of the previous amplifier or source C: the signal to noise introduced by the optical multiplexer D: the accumulated noise to signal ratio of the optical channel
In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（） A: the signal to noise of the current optical amplifier B: the signal to noise of the previous amplifier or source C: the signal to noise introduced by the optical multiplexer D: the accumulated noise to signal ratio of the optical channel
Shannon's theorem describes the relationship between "bandwidth" and "rate" from a quantitative point of view. In the formula of Shannon's theorem, the parameters related to the maximum transmission rate of the channel mainly includes channel bandwidth and ()? A: Frequency characteristics B: Signal-to-Noise Ratio C: Phase Characteristics D: Noise Power
Shannon's theorem describes the relationship between "bandwidth" and "rate" from a quantitative point of view. In the formula of Shannon's theorem, the parameters related to the maximum transmission rate of the channel mainly includes channel bandwidth and ()? A: Frequency characteristics B: Signal-to-Noise Ratio C: Phase Characteristics D: Noise Power
Noise includes: ____________ noise, ____________ noise, ____________noise and ____________noise.
Noise includes: ____________ noise, ____________ noise, ____________noise and ____________noise.
Not until midnight ______. A: did the noise stop B: the noise stopped C: the noise did stop D: stopped the noise
Not until midnight ______. A: did the noise stop B: the noise stopped C: the noise did stop D: stopped the noise
_____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
_____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
For both m-law and A-law, the signal-to-noise (SNR) of low-level and high-level signals improve with the increasing m and A.
For both m-law and A-law, the signal-to-noise (SNR) of low-level and high-level signals improve with the increasing m and A.
what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete
what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete
Noise differs from sound in that ______. A: noise interferes with the task being done B: noise is a special type of loud sound C: noise is usually unavoidable in big cities D: noise can be defined more precisely than sound
Noise differs from sound in that ______. A: noise interferes with the task being done B: noise is a special type of loud sound C: noise is usually unavoidable in big cities D: noise can be defined more precisely than sound