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AM/FM Receiver

AM/FM ReceiverCommunication Systems We have studied the basic blocks of any communication system Modulator Demodulator Modulation Schemes: Linear Modulation (DSB, AM, SSB, VSB) Angle Modulation (FM, PM) AM/FM radio System Principles: Frequency Spectrum Sharing (many transmitters using one medium) Demodulating desired signal and rejecting other signals transmitted at the same timeAM/FM radio System The source signal is audio Different sources have different spectrum Voice (speech) Music Hybrid signals (music, voice, singing) AM/FM radio System Different audio sources have different bandwidth W Speech- 4kHz High quality music- 15kHz AM radio limits baseband bandwidth W to 5kHz FM radio uses baseband bandwidth W to 15kHzAM/FM radio System radio system should be able to receive any type of audio source simultaneously.

AM/FM Radio System • The different radio stations share the frequency spectrum over the air through AM and FM modulation. • Each radio station, within a certain geographical region, is designated a carrier frequency around which it has to transmit • Sharing the AM/FM radio spectrum is achieved through Frequency Division Multiplexing (FDM)

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