lecture7

lecture7 - Lecture Outline(Week 4 lecture 1 Radio and TV...

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Lecture Outline (Week 4, lecture 1) Radio and TV Broadcasting Reading: Focus on these notes. If you want to find out more, read text2 3.4. Material covered: 1. AM Radio Broadcasting Frequency allocation: 540-1600 kHz with 10 kHz spacing (about 100 channels). Conventional AM. Superheterodyne AM receiver Intermediate Frequency (IF) at 455 kHz with IF c LO f f f + = RF amplifier has larger bandwidth, IF RF f B 2 < : High quality narrow passband IF amplifier: 2. FM Radio Broadcasting Frequency allocation: 88-108 MHz with 200 kHz spacing (about 100 channels). IF at 10.7 MHz with bandpass filter of 200 kHz bandwidth 1
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FM Stereo Broadcasting: Add left and right audio signals. Add pilot tone at 19 kHz instead of 38 kHz Find difference between left and right signal, encode as DSB-SC AM Frequencies occupied in baseband are respectively 0-15 kHz and 23-53 kHz. Monophonic FM receiver receives only the 0-15 kHz signal.
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lecture7 - Lecture Outline(Week 4 lecture 1 Radio and TV...

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