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Bài 1:
If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500,
700, and 900 Hz,what is the bandwidth? Draw the spectrum, assuming all components have a
maximum amplitude of 10 V.
Bài 2:
A signal has a bandwidth of 20 Hz. The highest frequency is 60 Hz. What is the lowest
frequency? Draw the spectrum if the signal contains all integral frequencies of the same
amplitude.
Bài 3:
A signal has a spectrum with frequencies between 1000 and 2000 Hz (bandwidth of 1000 Hz).
A medium can pass frequencies from 3000 to 4000 Hz (a bandwidth of 1000 Hz). Can this
signal faithfully pass through this
medium?
Bài 4:
Consider a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two
signal levels. The maximum bit rate can be calculated as
Bài 5:
Consider the same noiseless channel, transmitting a signal with four signal levels (for each
level, we send two bits).The maximum bit rate can be calculated as:
Bài 6:
Imagine a signal travels through a transmission medium and its power is reduced to half. This
means that P2 = 1/2 P1. In this case, the attenuation (loss of power) can be calculated as?
Bài 7:
Imagine a signal travels through an amplifier and its power is increased ten times. This means
that P2 = 10 ¥
P1. In this case, the amplification (gain of power) can be calculated as ?
Bài 8:
One reason that engineers use the decibel to measure the changes in the strength of a signal is
that decibel numbers can be added (or subtracted) when we are talking about several points
instead of just two (cascading). In Figure 3.22 a signal travels a long distance from point 1 to
point 4. The signal is attenuated by the time it reaches point 2. Between points 2 and 3, the
signal is amplified. Again, between points 3 and 4, the signal is attenuated. We can find the
resultant decibel for the signal just by adding the decibel measurements between each set of
points.
Figure 3.2:

...
Bài 1:
If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500,
700, and 900 Hz,what is the bandwidth? Draw the spectrum, assuming all components have a
maximum amplitude of 10 V.
Bài 2:
A signal has a bandwidth of 20 Hz. The highest frequency is 60 Hz. What is the lowest
frequency? Draw the spectrum if the signal contains all integral frequencies of the same
amplitude.
Bài 3:
A signal has a spectrum with frequencies between 1000 and 2000 Hz (bandwidth of 1000 Hz).
A medium can pass frequencies from 3000 to 4000 Hz (a bandwidth of 1000 Hz). Can this
signal faithfully pass through this
medium?
Bài 4:
Consider a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two
signal levels. The maximum bit rate can be calculated as
Bài 5:
Consider the same noiseless channel, transmitting a signal with four signal levels (for each
level, we send two bits).The maximum bit rate can be calculated as:
Bài 6:
Imagine a signal travels through a transmission medium and its power is reduced to half. This
means that P2 = 1/2 P1. In this case, the attenuation (loss of power) can be calculated as?
Bài 7:
Imagine a signal travels through an amplifier and its power is increased ten times. This means
that P2 = 10 ¥
P1. In this case, the amplification (gain of power) can be calculated as ?
Bài 8:
One reason that engineers use the decibel to measure the changes in the strength of a signal is
that decibel numbers can be added (or subtracted) when we are talking about several points
instead of just two (cascading). In Figure 3.22 a signal travels a long distance from point 1 to
point 4. The signal is attenuated by the time it reaches point 2. Between points 2 and 3, the
signal is amplified. Again, between points 3 and 4, the signal is attenuated. We can find the
resultant decibel for the signal just by adding the decibel measurements between each set of
points.
Figure 3.2:
Bài tập kỹ thuật truyền số liệu - Người đăng: Cuộc Sống Tươi Đẹp
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