| 61. | ___________ conversion involves three techniques: line coding, block coding, and scrambling. |
| a. | Analog-to-digital |
| b. | Digital-to-analog |
| c. | Analog-to-analog |
| d. | Digital-to-digital |
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Answer: (d).Digital-to-digital
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| 62. | ________ is the process of converting digital data to a digital signal. |
| a. | Block coding |
| b. | Line coding |
| c. | Scrambling |
| d. | None of the above |
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Answer: (b).Line coding
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| 63. | _______ provides redundancy to ensure synchronization and inherent error detection. |
| a. | Block coding |
| b. | Line coding |
| c. | Scrambling |
| d. | None of the above |
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Answer: (a).Block coding
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| 64. | ________ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group. |
| a. | Block coding |
| b. | Line coding |
| c. | Scrambling |
| d. | None of the above |
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Answer: (a).Block coding
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| 65. | ________ provides synchronization without increasing the number of bits. |
| a. | Scrambling encoding |
| b. | Line coding |
| c. | Block coding |
| d. | None of the above |
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Answer: Scrambling
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| 66. | Two common scrambling techniques are ________. |
| a. | NRZ and RZ |
| b. | AMI and NRZ |
| c. | B8ZS and HDB3 |
| d. | Manchester and differential Manchester |
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Answer: (c).B8ZS and HDB3
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| 67. | The most common technique to change an analog signal to digital data is called __________. |
| a. | PAL |
| b. | PCM |
| c. | sampling |
| d. | none of the above |
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Answer: (b).PCM
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| 68. | The first step in PCM is ________. |
| a. | quantization |
| b. | modulation |
| c. | sampling |
| d. | none of the above |
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Answer: (c).sampling
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| 69. | There are three sampling methods: __________. |
| a. | quantized, sampled, and ideal |
| b. | ideal, sampled, and flat-top |
| c. | ideal, natural, and flat-top |
| d. | none of the above |
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Answer: (c).ideal, natural, and flat-top
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| 70. | ______ finds the value of the signal amplitude for each sample; ____ finds the change from the previous sample. |
| a. | DM; PCM |
| b. | PCM; DM |
| c. | DM; CM |
| d. | none of the above |
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Answer: (b).PCM; DM
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