QUESTION 3 (25 MARKS) Describe TWO (2) advantages and TWO (2) disadvantages of digital transmission (C01:...
a. Describe TWO (2) advantages and TWO (2) disadvantages of digital transmission. (CO1: PO1 - 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 Vp-p 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...
QUESTION 2 (25 MARKS) In FM transmission circuits, explain the purpose and function of: a. i. Pre-emphasis and de-emphasis circuits. (C01: P01 - 3 Marks) ii. Limiter circuit (C01: P01 - 3 Marks) b. A sinusoidal carrier wave of frequency fe = 110 MHz is modulated by a modulating signal m(t). The characteristics of the modulating signal is illustrated in Figure Q2(b) and the Frequency Deviation Constant of the FM Modulator, ks = 10Hz/volt. Determine the minimum bandwidth required for...
QUESTION 2 (25 MARKS) In FM transmission circuits, explain the purpose and function of: a. i. Pre-emphasis and de-emphasis circuits. (CO1: P01 - 3 Marks) ii. Limiter circuit. (C01: P01 - 3 Marks) b. A sinusoidal carrier wave of frequency ſe = 110 MHz is modulated by a modulating signal m(t). The characteristics of the modulating signal is illustrated in Figure 02(b) and the Frequency Deviation Constant of the FM Modulator, ky = 107 Hz/volt. Determine the minimum bandwidth required...
2. a. Find Eb/No and Amplitude A required to give Pb 10-5 for the following coherent digital modulation schemes if No-10-5 and time is 0.5msec i. On-Off keying (ASK), ii. BPSK, iii. BFSK and v. BPSK with a phase error of 5 deg. Consider an audio signal with spectral components limited to the frequency band 300 to 3300 Hz. Assume that the sampling rate of 8000 samples/s will be used to generate a PCM signal. The ratio of peak signal...
2. In a digital transmission system is required that the quantization noise does not exceed +/-2% of the peak-to-peak value of the analog signal.If the analog signal bandwidth and allowable transmission bandwidth are each 4000 Hz and sampling take place at Nyquist rate, what value of bandwidth efficiency is needed.
please answer all questions O The Hong Kong Polytechnic University Section A 1. (a) A digital thermometer is designed to measure temperature ranging from 20°C to 45°c. 0) Describe the two steps involved in the digitization of analog signals (4 marks) (i) If the quantization error is required to be less than O. I C, how many bits are required to encode the temperature readings? (4 marks) (ii)What is the temperature reading of 26.S°C in binary form after the digitization?...
CCN1049 Physics Semester Two of 2018/159 Question Q3 (25 marks) (a) A string oscillates according to the standing wave equation given below 23 (xt)0.005 sin((30 + ds)rx) cos((40 - d)mt) 37 where x and y are in meters, and t is in seconds. Calculate the followings:- (0 The amplitude and speed of the two transverse waves y,(x.t) and y2Cx,t), identical but travelling in opposite direction, whose superposition gives this y (o, t) oscllation. 4 marks) a= (ii) The distance between...
t for OSts 3 sketch the following orosts3 waveforms: (a) x(-t) 1. For the signal e) and (bl x(2-t) with appropriate labelling, (2+2-4 marks) 2. Recall that the energy of a continuous-time signal is defined as E-匚x3(t)dt for real x(t). Write the corresponding expression for the energy of a discrete-time signal x(n). Find the energy of the discrete-time signal x(n)- 3) forn<0 1+3-4 marks & Find the final value of the response y(t) of a system whose transfer function is...
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