Question

131M The main goal of digital communication is to provide reliable trang miG9IOn in the pregence of noise and distortion to sally ters Uses a microphone to transmit her vace signal on Sky pe Advice Gally on the most appropnate sampling rate to eneure that her 'measage to recons tructed correctly at the recaiveng end Lin bThe PCM ancoled bit 9equences are then tronsmited to a receiver using Manchester encoding Help the recever to cecode the bits Voltage as shown in figure OFvaluate the per formanre of the line cading in (b) if Differental Manches ter line encading tehniques is used instecd Explain why Aise (ode Matylation (PLM) is a pre ferred digithzation techniqe to Auge Amptu de Modulation (PAM) Time Dision Miltipleaing (TPm)

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Answer 1

a) Sampling rate, ts 2m SamptPng theonm, Sampleng rate eaial to Content im th message ignal Should be greates & tiames the maximum frequency Ag per than im order to Signal from its Samples forequeny Content YeConstruct the f masimam Stgral aoice freaneny im the voice band 300 Hz to 3400 Hz fom3400 Hz fez 6800 Hz Sam pling frequeny Sampling rate We can cheose 10 KHz

Manchegter desoding IV -iv Decoded bits 1m Manchester encoding +IV 0 0 transition is areparesented by logic Tb -1 fs nepresented by +lv togic 0 0 to l transitien Tb IV

differential Manche Ster encoded using Griven message bito encodi ng 41V -I V Transt on mo tran Setion m differantial Mancheste encodi na at the toransition beginning of bit tmterval the mput bit is O OcluYG at the beqemning of bit There wil be mo transition interval if the Pmput bit is ! Advantages transiten at leagt Clock mecovert fg pogoible, because for eremy bit Hence detecttng Noloe will not affect the transitons a) parome legs ermo 2) Mfnimize alectromagmettc noise preduced by tfme transmission

Advantages of ?CM over PAM Tme diviofen amultipleaing moise fomemunity of PCM fs Aigher than that of PAM PCM fo preffered over Transanitea effecieny and forr long aist ante Commmun?cation PAM Signal to Nofse ration and Band width trade off s bettee for PCM. PAM is more notse pne to