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Ideal Institute of Science and Technology. Teacher Name: Md. Sozol Hossain Junior Instructor Computer IIST. Subject : Data Communication & Computer Network-1 Subject Code : 6663 Department : Computer Semester : 6 th. Lecture-3.

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Ideal Institute of Science and Technology

Teacher Name: Md. Sozol Hossain

Junior Instructor Computer

IIST


Subject : Data Communication &

Computer Network-1

Subject Code : 6663

Department : Computer

Semester : 6th


Lecture-3

মডুলেশনঃ ক্যারিয়ার ওয়েভের সাথে সিগনাল ওয়েভের মিশ্রণকে

মডুলেশন বলা হয়।

ডিমডুলেশনঃ কোন স্থান থেকে মডুলেটকৃত ডাটা পূনরায় অ্যানালগ

ডাটাতে পরিণত করার প্রক্রিয়াকে ডিমডুলেশন বলে।

Demodulation

Modulation

Modulator

Analog Signal

Analog Signal

Fig: Demodulation


মডুলেশনের প্রকারভেদঃ

চিত্র: মডুলেশনের প্রকারভেদ


AM মডুলেশনঃ

Signal

Carrier

A.M. Wave

Fig: AM Modulation


FM (Frequency Modulation):

t

t

O

O

Modulating Signal

Carrier – fo

t

O

FM Carrier


ASK (Amplitude Shift Keying):

Fig: Amplitude Shift Keying

0

1

1

1

1

0

1

1

0

Fig: Binary Amplitude Shift Keying


Frequency Shift Keying:

0

1

1

1

Fig: Frequency Shift Keying


Phase Shift Keying:

1

0

1

1

0

Fig: Binary Phase Shift Keying



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