15.7 MODULATION AND ITS NECESSITY
Chapter 8: Chapter 15 · PHYSICS PART-2 · EN medium
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. MODULATION AND ITS NECESSITY As already mentioned, the purpose of a communication system is to transmit information or message signals. Message signals are also called baseband signals, which essentially designate the band of frequencies representing the original signal, as delivered by the source of information. No signal, in general, is a single frequency sinusoid, but it spreads over a range of frequencies called the signal bandwidth. Suppose we wish to transmit an electronic signal in the audio frequency (AF) range (baseband signal frequency less than kHz) over a long distance directly. Let us find what factors prevent us from doing so and how we overcome these factors,
📖 NCERT Class 12 Physics Part 2 · Page 218
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. MODULATION AND ITS NECESSITY As already mentioned, the purpose of a communication system is to transmit information or message signals. Message signals are also called baseband signals, which essentially designate the band of frequencies representing the original signal, as delivered by the source of information. No signal, in general, is a single frequency sinusoid, but it spreads over a range of frequencies called the signal bandwidth.
Suppose we wish to transmit an electronic signal in the audio frequency (AF) range (baseband signal frequency less than kHz) over a long distance directly. Let us find what factors prevent us from doing so and how we overcome these factors,
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