Answer Posted / visakh
Video signals have significant information content upto
frequencies of 4.5 MHz. So their BW is approx 4.5 MHz.
Hence if we use FM, the transmission BW becomes much
greater than 9 MHz according to Carson's rule. If AM is
used, the transmission BW is 9 MHz. Hence we actually
choose a variant of AM called VSB where by the BW obtained
is slightly greater than 4.5 MHz. Why VSB is chosen is
because if SSB is used, we need filters with ideal
characteristics to filter out a sideband which is not
practical.
FM is used for audio because:
1. Higher noise immunity because FM is not affected by
amplitude variations.
2. The BW allotted to each FM broadcasting station is
200KHz whereas it is 10KHz for AM. The audio frequency
range is from 20Hz- 20KHz. So using FM we can reproduce all
the audio frequencies giving hence giving better clarity.
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
Draw the circuit diagram of 1φ auto sequential commutated current source inverter and explain its operation with equivalent circuits for different modes and necessary waveforms?
What is the current flowing through BTS? Pls explain?
Explain the difference between leds and pn junction diode?
Why is transistor called a current controlled device ?
Why the feeding frequency to a microprocessor is twice the operating frequency?
Explain the working of current commutated chopper with aid of circuit diagram and necessary wave forms. Derive an expression for its output voltage?
What is modulation? And where it is utilized?
What is a cathode ray oscilloscope (cro)?
What is a bjt?
why is the plastic dip ic package most widely used?
hi ,iam saikiran my betch is 56% of 24 backlogs .gre 860,ielts 5.5 and i had booked my slot in june ,how i should prepare any suggestion
Plz send previous gate ece question papers with answers of 10 years to my email id .My id is seenu469@gmail.com .Thank u sir
How to manufacture the cmos inverter?
What is the feature’s in Group Policy? What is DNS? what is the use of DNS?
Explain what is an excitation table?
