| Q. |
A narrow band noise can exist in |
| A. | am only |
| B. | pcm only |
| C. | fm only |
| D. | am and fm both |
| Answer» D. am and fm both | |
| Explanation: narrow band filter is used to isolate a narrow band of frequencies from a wider bandwidth signal. it is a combination of band pass and band reject filter. so it can be used in both am and fm to pass a band of frequencies or to attenuate a band of frequencies. | |
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