Pulse Analog Modulation MCQ Quiz in বাংলা - Objective Question with Answer for Pulse Analog Modulation - বিনামূল্যে ডাউনলোড করুন [PDF]
Last updated on Mar 19, 2025
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Pulse Analog Modulation Question 1:
An Audio signal is Band limited to 5 kHz and is sampled at the minimum sampling rate and then quantized using 256 level quantizer. A raised cosine pulse shaping filter with unity roll off factor is used. If the signal is modulated using 16 QAM scheme, then the bandwidth of the Resultant bandpass waveform is _______kHz
Answer (Detailed Solution Below)
Pulse Analog Modulation Question 1 Detailed Solution
Concept:
The Bandwidth of resultant modulated signal is given by:
\({\rm{B}}.{\rm{W}} = \frac{{{{\rm{R}}_{\rm{b}}}\left( {1 + {\rm{\alpha }}} \right)}}{{{{\log }_2}{\rm{M}}}}\)
where α is the roll off factor
Calculation:
Bit rate \(= \underbrace {2 \times {{\rm{f}}_{\rm{m}}} \times }_{{\rm{sampling\;}}}\mathop {\underbrace {\rm{n}}_ \downarrow }\limits_{{\rm{Quantizing}}}\)
\(n = \log _2^{256} = 8\)
Rb = 2 × 5 × 8 = 80
\(B.W = \frac{{80}}{{{{\log }_2}16}}\left( {1 + 1} \right) = \frac{{160}}{4} = 40\;kHz\)Pulse Analog Modulation Question 2:
Which of the following statements is a reason for high signal-to-noise ratio in case of FM?
Answer (Detailed Solution Below)
Pulse Analog Modulation Question 2 Detailed Solution
All these factors responsible for high signal to noise ratio:
- There is less noise at frequencies at which FM is used.
- Amplitude limiter are incorporated in FM receivers.
- Interference from other FM transmitter is very less.