Data Encoding Part V : Analog to Analog Conversion Surasak - PDF document

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1/7 Data Encoding Part V : Analog to Analog Conversion Surasak Sanguanpong nguan@ku.ac.th http://www.cpe.ku.ac.th/~nguan Last updated: 25 November 2004 Applied Network Research Group Department of Computer

1/7 Data Encoding Part V : Analog to Analog Conversion Surasak Sanguanpong nguan@ku.ac.th http://www.cpe.ku.ac.th/~nguan Last updated: 25 November 2004 Applied Network Research Group Department of Computer Engineering, Kasetsart University 2/7 Analog Data, Analog signal � Use Modulation techniques � Need a high frequency for effective transmission � Modulation permits frequency division multiplex Applied Network Research Group Department of Computer Engineering, Kasetsart University 1
3/7 Analog Modulation Amplitude-modulated wave Carrier Frequency-modulated wave Modulating sine-wave signal Phase-modulated wave Applied Network Research Group Department of Computer Engineering, Kasetsart University 4/7 AM Spectrum Modulated signal Modulating signal s ( f ) V m carrier V m Upper Lower sideband sideband f V c f m 2 f Carrier signal f c - f m f c f c + f m V c 2 f m Bandwidth Each sideband contains the complete spectrum modulating signal f f c Applied Network Research Group Department of Computer Engineering, Kasetsart University 2
5/7 AM band allocation 1700 KHZ 540 KHz f c1 f c2 f c3 540 KHz 550 KHz 560 Kz 10 KHz 10 KHz 10 KHz Applied Network Research Group Department of Computer Engineering, Kasetsart University 6/7 FM band allocation 108 MHz 88 MHz No station here No station here CH CH CH CH1 CH2 CH3 CH4 ……………………………. 98 99 100 N = 5 ( f -47.9) N=201 N=202 N=203 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band f c1 f c2 f c3 N= broadcast channel number 88.1 MHz 88.3 MHz 88.5 MHz f = frequency in MHz 150 KHz 150 KHz 150 KHz 200 KHz 200 KHz 200 KHz http://www.fcc.gov/mmb/asd/bickel/oddno.html Applied Network Research Group Department of Computer Engineering, Kasetsart University 3
7/7 FM and PM Carrier Modulating sine-wave signal Amplitude-modulated (DSBTC) wave Phase-modulated wave Frequency-modulated wave Applied Network Research Group Department of Computer Engineering, Kasetsart University 4

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