Discussion
| List - I | List - II |
|---|---|
| a. Frequency modulation | i. Envelope detection |
| b. Double sideband suppressed signal carrier | ii. Companding |
| c. PCM | iii. Balance modulator |
| d. Amplitude modulation | iv. Pre-emphasis and de-emphasis |
Codes : a b c d
Answer: D
Frequency modulation uses pre-emphasis and de-emphasis to improve the noise performance (iv); a double sideband suppressed carrier signal is produced by a balanced modulator (iii); PCM uses companding to improve the quantization of weak signals (ii); and amplitude modulation is demodulated by an envelope detector (i). So the code is a-iv, b-iii, c-ii, d-i. The answer is a-iv, b-iii, c-ii, d-i.
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