Data Encoding Part V : Analog to Analog Conversion Surasak - - PDF document
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
Applied Network Research Group Department of Computer Engineering, Kasetsart University 1/7
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
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 3/7
Applied Network Research Group Department of Computer Engineering, Kasetsart University 4/7
Lower sideband Upper sideband
f
f f
Modulating signal Carrier signal Modulated signal
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fc1
540 KHz
fc2
550 KHz 10 KHz 10 KHz 10 KHz
fc3
560 Kz
540 KHz 1700 KHZ Applied Network Research Group Department of Computer Engineering, Kasetsart University 6/7
CH1 CH2 CH3 CH4 ……………………………. CH CH CH 98 99 100
No station here
fc1
88.1 MHz
fc2
88.3 MHz
25 KHz Guard band
150 KHz 200 KHz 200 KHz 200 KHz 150 KHz 150 KHz
fc3
88.5 MHz
No station here 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band 25 KHz Guard band
88 MHz 108 MHz
N=201 N=202 N=203
N= broadcast channel number f = frequency in MHz
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