Modulation and demodulation are fundamental processes in telecommunications that involve the encoding (modulation) and decoding (demodulation) of information onto a carrier signal for transmission and reception, respectively.
Modulation:
Modulation is the process of modifying a carrier signal by varying one or more of its properties-such as amplitude, frequency, or phase-based on the information signal being sent. The primary purpose of modulation is to allow the transmission of information (voice, data, video) over a communication channel efficiently and with minimal interference.
There are several types of modulation techniques:
Amplitude Modulation (AM): In AM, the amplitude of the carrier signal is varied in accordance with the instantaneous amplitude of the modulating signal. This method is commonly used in radio broadcasting.
Frequency Modulation (FM): FM alters the frequency of the carrier signal based on the variations in the amplitude of the modulating signal. It's often used in high-fidelity audio broadcasting and two-way radio communication.
Phase Modulation (PM): PM involves changing the phase of the carrier signal proportional to the instantaneous value of the modulating signal. It is used in various digital transmission systems.
Phase Shift Keying (PSK), Frequency Shift Keying (FSK), Amplitude Shift Keying (ASK): These are digital modulation techniques where the digital data is represented by different variations in phase, frequency, or amplitude of the carrier signal.
Demodulation:
Demodulation is the process of extracting the original information signal from the modulated carrier signal at the receiving end. It's essentially the reverse process of modulation. Demodulation is essential to recover the transmitted data accurately for further processing or utilization.
The demodulator aims to retrieve the original information signal by separating it from the carrier signal and any added noise or interference that occurred during transmission. Demodulation techniques vary depending on the modulation method used. For instance, there are specific demodulators for AM, FM, PM, PSK, FSK, etc., each tailored to recover the encoded information accurately.
Overall, modulation and demodulation are crucial processes in telecommunications, allowing the efficient and reliable transmission of information across various communication channels. They form the basis for numerous modern communication systems, including radio, television, wireless networks, and many other forms of data transmission.
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modulation explained.
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Academy of Technology
Academy of Technology is an online resource in Urdu and Hindi languages.
The website focuses on providing quality video lectures and notes related to topics. Our aim is to help people by giving them comprehensive information and techniques to improve their knowledge in computer and communication networking. Our focused audience is beginner level but some topics need some background.We are opening doors for everyone to get some knowledge.Our target study areas are
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