In: Computer Science
QUESTION 15
Which line coding technique represents logical “1s” as alternating voltage changes (e.g., 1,1 represented as +v, -v).
a. Non-return to zero (NRZ) |
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b. Bipolar Alternative Mark Inversion (AMI) |
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c. Manchester |
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d. Bipolar with 8-zero substitution |
QUESTION 16
4B5B differs from line coding techniques in that is ensures that strings of consecutive “1s” and “0s” do not exist prior to being line coded. Select the correct statement(s) regarding 4B5B.
a. since 4B5B eliminates long string of logical “1s” and “0s”, simpler line coding techniques such as NRZ can be used. |
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b. since one bit out of every five bits sent is not real information, the data link suffers from a 1/5 or 20% overhead cost (i.e., reduction in data throughput) |
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c. only 80% of the data sent using 4B5B is real information |
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d. all of the above are correct statements |
QUESTION 17
Analog-to-digital conversion (ADC) describes converting an analog signal into digital data. How is this accomplished?
a. analog signals are continuous and therefore can never be converted into a digital signal |
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b. analog signals must undergo a line coding process |
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c. analog signals mush be sampled and quantized |
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d. analog signals are modulated onto digital carriers |
QUESTION 18
You want to capture a live music concert and covert it into digital format for transmission. The human ear has a frequency bandwidth of approximately 20,000 Hz. Select the best sampling rate and bit depth. (hint: use Nyquist and a bit-depth of 16)
a. fs=40,000 samples/s, Bit depth = 1 bit per sample |
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b. fs=40,000 samples/s, Bit depth = 16 bit per sample |
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c. fs=10,000 samples/s, Bit depth = 16 bit per sample |
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d. fs=20,000 samples/s, Bit depth = 1 bit per sample |
QUESTION 19
When digitizing an analog signal, quantization errors will always be present regardless of bit-depth used.
True
False
QUESTION 20
What happens during an analog-to-digital conversion process, if you fail to follow the Nyquist formula?
a. signal aliasing occurs |
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b. quantization errors are experienced |
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c. nothing – your signal will be fine |
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d. None of the above |
QUESTION 21
You digitize an analog signal that has a frequency bandwidth of 8kHz, using a bit depth of 4. What data rate must be supported?
a. 32 kpbs |
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b. 64 kbps |
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c. 128 kbps |
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d. 256 kbps |
15. Which line coding technique represents logical “1s” as alternating voltage changes (e.g., 1,1 represented as +v, -v).
b. Bipolar Alternative Mark Inversion (AMI)
16. 4B5B differs from line coding techniques in that is ensures that strings of consecutive “1s” and “0s” do not exist prior to being line coded. Select the correct statement(s) regarding 4B5B.
all of the above are correct statements
17. Analog-to-digital conversion (ADC) describes converting an analog signal into digital data. How is this accomplished?
c. analog signals mush be sampled and quantized
18. You want to capture a live music concert and covert it into digital format for transmission. The human ear has a frequency bandwidth of approximately 20,000 Hz. Select the best sampling rate and bit depth. (hint: use Nyquist and a bit-depth of 16)
c. fs=10,000 samples/s, Bit depth = 16 bit per sample
19. When digitizing an analog signal, quantization errors will always be present regardless of bit-depth used.
True
20. What happens during an analog-to-digital conversion process, if you fail to follow the Nyquist formula?
quantization errors are experienced,
21. You digitize an analog signal that has a frequency bandwidth of 8kHz, using a bit depth of 4. What data rate must be supported?
a. 32 kpbs
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