Question

QUESTION 3 (25 MARKS) Describe TWO (2) advantages and TWO (2) disadvantages of digital transmission (C01: P01 - 4 marks) b Sampling, quantization and coding are the three processes used to represent an analog signal in digital form. Considering an input signal into an 8-bit Pulse Code Modulation (PCM) system is a 20 Vpp 50-Hz, answer the followings: i. Using appropriate diagram briefly describe TWO (2) basic methods to perform the sampling function. (CO2: PO2 - 2 marks) Determine the number of quantization levels. (CO2: PO2 - 2 marks) Determine the quantization interval. (CO2: PO2 - 1.5 marks) iv. Determine the quantization error. (CO2: PO2 - 1.5 marks) V. Determine the quantization signal-to-noise ratio. (CO2: PO2 - 2 marks) vi. If the system runs uniform quantization using folded binary code, find the equivalent code for +9.89 V and voltage value for 11110001 (CO2: PO2 - 4 marks)

Answer 1

Solution of Advantage Transmission: Digital of There advantages Digital Transmission following are * It produces less error. (ie i As and o) binary. cue Enow data transmitted errors. Hence, and correct easier de teat to (it al locus higher transmission rates!! eg. For higher data rata only Optical designed for digital transmission, fibre is secure ere. more More efficient, Disadvantage of Digital transmission, than Analog transmission, required More Bandwidth additional use of encoder and More complex. (Due de conter) Hera ne Upup = (20 volt) (Given) 8 CGiven) of Quantigation Levels (4) = 2: t Y NO (2) = 256 No. of Comantization Levels 256 Answer in quantization Interval A= Step sige nothing but step Size Umax - Unin) (Up-e) L 20 Gast - 78.125 my 256 Ans 78. 125my

in quantization error (Qe termini tra 2 (781125) 39.0625) 2 Aceantization error (Imax 39.0625. Answer Sinusoidal consider Sinusoidhe input. we y of inen Signal (SNR) = ( 4(2309) to Noise ratio is given by 3 7. - 2 (2) (2) Boucho) (SNR) a (384) (SNR) in de 6 x (234) = $x (28) 20100 (384) 51.8 dB And 51.8dB