Download the latest CBSE Class 12 Physics Communication Systems Notes Set B in PDF format. These Class 12 Physics revision notes are carefully designed by expert teachers to align with the 2025-26 syllabus. These notes are great daily learning and last minute exam preparation and they simplify complex topics and highlight important definitions for Class 12 students.
Chapter-wise Revision Notes for Class 12 Physics Chapter 15 Communication Systems
To secure a higher rank, students should use these Class 12 Physics Chapter 15 Communication Systems notes for quick learning of important concepts. These exam-oriented summaries focus on difficult topics and high-weightage sections helpful in school tests and final examinations.
Chapter 15 Communication Systems Revision Notes for Class 12 Physics
Class_XII: Physics
Chapter: Communication Systems
1. Analog and Digital Mode of Transmission. An analog message is physical quantity that varies with time usually in a smooth and continuous fashion.
A digital message is an ordered sequence of symbols selected from a finite set of discrete elements
2. Operational advantages of digital communication system over analog communication systems are:
(i) An improved security message
(ii) Increased immunity to noise and external interference.
(iii) A common format for encoding different kinds of message signals for the purpose of transmission.
(iv) Flexibility in configuration digital communication system.
3. Attenuation, Distortion, Interference and Noise are the undesirable effects in the source of signal transmission.
4. Modulation. Process of changing some characteristic e.g. amplitude, frequency or phase of a carrier wave in accordance with the intensity of the signal is known as modulation.
5. Types of Modulation
(i) Amplitude modulation
(ii) Frequency modulation
(iii) Phase modulation.
6. Amplitude Modulation. The amplitude of the carrier wave changes according to the intensity of the signal. The amplitude variation of the carrier wave is at the signal frequency s.
7. Modulation Factor. The ratio of change of amplitude of carrier wave to the amplitude of normal carrier wave is called modulation factor (m).
8. Pulse modulation could be classified as: Pulse Amplitude Modulation (PAM), Pulse Duration Modulation (PDM) or Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM).
9. Demodulation. Demodulation is the process of recovering the signal intelligence from a modulated carrier wave.
10. FAX. Facsimiles of FAX means exact reproduction of the documents, a picture, letter, map etc. at receiver end.
11. MODEM. The term modem means modulator and demodulator. It converts a series of binary pulses of digital information into an analog signal and transmits across the phone lines.
Please refer to the link below for CBSE Class 12 Physics Notes - Communication Systems
| CBSE Class 12 Physics Alternating Current Notes Set A |
| CBSE Class 12 Physics Alternating Current Notes Set B |
| CBSE Class 12 Physics Wave Optics Notes Set A |
| CBSE Class 12 Physics Wave Optics Notes Set B |
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CBSE Class 12 Physics Chapter 15 Communication Systems Notes
We hope you liked the above notes for topic Chapter 15 Communication Systems which has been designed as per the latest syllabus for Class 12 Physics released by CBSE. Students of Class 12 should download and practice the above notes for Class 12 Physics regularly. All revision notes have been designed for Physics by referring to the most important topics which the students should learn to get better marks in examinations. Our team of expert teachers have referred to the NCERT book for Class 12 Physics to design the Physics Class 12 notes. After reading the notes which have been developed as per the latest books also refer to the NCERT solutions for Class 12 Physics provided by our teachers. We have also provided a lot of MCQ questions for Class 12 Physics in the notes so that you can learn the concepts and also solve questions relating to the topics. We have also provided a lot of Worksheets for Class 12 Physics which you can use to further make yourself stronger in Physics.
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