Question

In: Computer Science

QUESTION 15 Which line coding technique represents logical “1s” as alternating voltage changes (e.g., 1,1 represented...

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)

b. Bipolar Alternative Mark Inversion (AMI)

c. Manchester

d. Bipolar with 8-zero substitution

QUESTION 16

  1. 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.

    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)

    c. only 80% of the data sent using 4B5B is real information

    d. all of the above are correct statements

QUESTION 17

  1. 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

    b. analog signals must undergo a line coding process

    c. analog signals mush be sampled and quantized

    d. analog signals are modulated onto digital carriers

QUESTION 18

  1. 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

    b. fs=40,000 samples/s, Bit depth = 16 bit per sample

    c. fs=10,000 samples/s, Bit depth = 16 bit per sample

    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

b. quantization errors are experienced

c. nothing – your signal will be fine

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

b. 64 kbps

c. 128 kbps

d. 256 kbps

Solutions

Expert Solution

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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