Which of the following statements are correct? A multiplier can be used as a balanced demodulator or detector.
50) Which of the following statements are correct?
- A multiplier can be used as a balanced demodulator or detector.
- Dynamic range compression is the process of reducing the peak-to-peak variation of a signal to a lower range.
- An antilogarithmic amplifier is useful for dynamic range compression.
- In a phase-locked loop circuit, the capture range is always larger than the lock range.
Choose the correct answer from the options given below:
Solution
In communication systems, an analog multiplier is used as a "product detector." By multiplying a received modulated signal with a local carrier frequency, you can extract the original baseband signal. This is the fundamental principle of a balanced demodulator.
Dynamic range is the ratio between the loudest and quietest parts of a signal. Compression "squeezes" this range by attenuating loud peaks or boosting quiet signals, effectively reducing the overall peak-to-peak variation.