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24-25 EE1030 Communication Engineering

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  Which

of the following choices best describes the function of the filter given below?

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   Calculate

the transfer function gain, |

H(f)|, of a series RC circuit at f0

=20Hz,

given

R=200 Ω and C=0.0001 F.

[Note:  H(f) = 1 / 1+j(f / B) , B = 1 / 2πRC ]

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  In

a Frequency division Multiplexing system having four frequency bands,

if the frequency bands are of 200 kHz bandwidth

separated by 15kHz guard bands, calculate the minimum capacity of the

communication channel.

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A

message signal with a peak voltage of 40 mV at a frequency of 600 Hz is applied

to an FM generator circuit.  If the

circuit has frequency sensitivity,

Kf

= 800 Hz /20mV,

calculate the peak frequency deviation.

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  Why

is it important to know the peak deviation constant,

Δf, in modulation?

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   What

is the significance of the frequency sensitivity factor,

Kf and what is its units?

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   Consider

a signal that has its highest frequency component at 8,000 Hz. What is the

minimum rate that the signal should be sampled by?

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   What

is the method with which a baseband signal can be transported to RF

frequencies?

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   In

envelope detection of an amplitude-modulated signal, what is the danger of

making the lowpass filters’ cutoff frequency too high a value?

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   If

a signal is sampled at 20kHz, what is the value of Nyquist?

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