Discussion
Match List I with List II and select the correct answer using the codes given below :
| List I | List II |
|---|---|
| (a) Mixer | (i) Convolution |
| (b) VCO | (ii) Frequency conversion |
| (c) Ring modulator | (iii) Generation of DSB-SC |
| (d) Codes | (iv) Generation of FM |
Answer: D
The correct matching is a-ii, b-iv, c-iii, d-i.
- A mixer multiplies two signals to shift a signal to a new frequency, which is frequency conversion (ii).
- A voltage-controlled oscillator changes its frequency with the input voltage, which generates FM (iv).
- A ring (balanced) modulator multiplies the message by the carrier and suppresses the carrier, generating DSB-SC (iii).
- Codes here refers to convolutional codes, whose encoder convolves the input bit stream with its generator sequences (i).
The other codes give the mixer or the ring modulator the wrong function.
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