Answer Posted / vibhor

we know that noise effect is more in higher frequencies than lower frequency......but we transmit the higher frequency signal for large distance communication so we can solve this problem by pre emphasis and de emphasis technique.

pre emphasis
this technique is used at the transmitting time before the modulator.In it the amplitude of higher frequency is increased so that the signal to noise ratio is incresed...

de emphasis
this tech is used at the reciver side after the demodulation to collect the original signal.In it the amplitude of higher frequency is decreased so that we collect the original signal.

Amplitude modulation is basically a A Summing of two signals B Multiplication of two signals C Subtraction of two signals D Non-linear process

2419

---

i had cmpltd my diploma with 89% in ECE and i got call letter foe the interview of isro bengaluru which bks i hv ti prefer

2050

---

Explain the different steps of Commissioning.

2063

---

iam an electronics & comm engg student.i have applied for AAI can u please forward the old and related question papers to my id lali.ece63@gmail.com

1830

---

please send me the previous question papers of ntpc writen test for ece

2188

---

if building "b" height casts a shadow "f ' feet long . the same day a tree "t" feet height will cast a shadow how many feet long ? a)ft/b b)fb/t c)b/ft d)tb/f e)t/fb

2155

---

which type of question are putup in IES exam?

2152

---

What is capacitor?

1170

---

differnce between ups and inverters. Series and parallel batteries connections of ups.

1772

---

What is step up cyclo-converter ?

1086

---

where do i get exercises for electronic circuits lab, i.e, designing various waveform(clipper, clamper, rectifiers)

2212

---

Explain what is an fpga?

1013

---

plz send me the website of dmrc for previous questions papers

1967

---

PLEASE SEND ME THE TTA EXAMS PREVIOUS PAPERS TO PREPARE TTA2009

2029

---

why we use -48V in nokia BTS

3043

---