Question Number: 363

Assignment Description:The purpose of this assignment is to motivate students to seek application of waveform codingtechniques for digital audio transmission and digital audio recording. The assignment has two parts:Part A and Part B.PART A: Implementation of µ-law and A-law Compander (40 marks)Most modern communications systems operate in the digital domain for various reasons. However,most practical signals handled by these systems are naturally analogue in nature. Thus, an interface isneeded between the signals and the systems handling them. This interface is called analogue-to-digitalconverter (ADC) and it’s reciprocal, digital-to analogue converter (DAC). The three main functions ofthe ADC are sampling, quantization and encoding.Requirements1) Implement nonlinear quantizers µ-law and A-law compander in MATLAB/Simulink andcompare the results. Matlab/Simulink code is required to be included in the report.2) Prepare a report incorporating theories behind non-uniform quantization. Report shouldinclude comparison result and its interpretation from the simulation.PART B: Source Coding in Digital Audio Systems (50 marks)Digital audio has become an integral part of our lives. Nearly all of the transmission of speech signalsover telephone channels is currently digital. Moreover, digital audio recording in the form of compactdisks (CDs) has become very popular. This assignment exposes the student to real world applicationsof digital communication in digital audio transmission and recoding. Therefore, the student shallacquire skills to understand the real world requirements, critically review the existing techniques andwrite a technical report based on his or her investigation.RequirementsThe student needs to address the following three areas:1) a) Requirement analysis: student is required to analyze the following for digital audio intelephone transmission systems: Bandwidth of speech signals and the required sampling rates to avoid aliasing Required number of bits per sample to achieve voice quality in telephonyME502 Overview of Digital Communication Page 3 of 5Lasted Updated: July, 2018b) In addition, student is also required to analyze the following for digital audio recording: Bandwidth of high quality audio and the required sampling rates Required number of bits per sample to achieve a high signal to quantization noise level forhigh quality audio.2) Investigation of current methods: student is required to review and analyze waveform-codingtechniques used in digital audio transmission and recording at present. At least PCM andDPCM methods need to be covered