ME502 Overview of Digital Communications | Assignment 1 Individual ME502 Overview of Digital Communications Assignment 1: Individual Written assignment Topic: Source Coding in Digital Audio & Waveform Encoder Design Using MATLAB/Simulink Submission Deadline: Week 6 Total Marks = 100 (Assignment’s contribution to final grade: 10%) Word Limit: Altogether 1500 words (11-point font in Times New Roman should be used.) Accepted File Type: Microsoft Word Purpose of the assessment: The purpose of this assignment is to motivate students to seek to application of waveform coding techniques for digital audio transmission and digital audio recording. The assignment has two parts: Part A and Part B. Part A: Source Coding in Digital Audio Systems (60 marks) Description of the assessment: 1. Background Digital audio has become an integral part of our lives. Nearly all of the transmission of speech signals over telephone channels is currently digital. Moreover, digital audio recording in the form of compact disks (CDs) has become very popular. This assignment exposes the student to a real world applications of digital communication in digital audio transmission and recoding. In doing so the student shall acquire skills to understand the real world requirements, critically review the existing techniques and write a technical report based on his or her investigation. 2. Requirements The student needs to address the following three areas: • Requirements: In this section the student is required to analyze the following for digital audio in telephone transmission systems; 1) bandwidth of speech signals and the required sampling rates to avoid aliasing, 2)required number of bits per sample to achieve voice quality in telephony, 3)typical bit rates used for local loops as well as on trunked lines; In this section the student is also required to analyze the following for digital audio recording ;1) bandwidth of high quality audio and the required sampling rates, 2)required number of bits per sample to achieve a high signal to quantization noise level for high quality audio. • Investigation of current methods: In this section, the student is required to review and analyze waveform coding techniques used in digital audio transmission and recording at present. At least PCM and DPCM methods need to be covered. • Investigation of new developments: In this section the student is required to do some research into the latest developments in waveform coding techniques for digital audio transmission and recoding. Suggested approach: 1. The student is required to analyze the requirements for digital audio transmission. 2. The student is encouraged to do a literature review on current practices of waveform coding for digital audio transmission and recoding. ME502 Overview of Digital Communications | Assignment 1 Individual 3. Submission Guidelines: Your assignment should be completed according to the General Guidelines for Presentation of Academic Work. 1. successful completion of required tasks 2. quality of figures i. comments ii. meaningful names 3. accompanying documentation including i. table of contents and page numbers ii. a front page - indicating your name. iii. list of references used (IEEE style) – please specify if none have been used. The assignment must be submitted in soft (electronic) copy under provided link in moodle course page. The page numbers of the assignment must be clear on each page. Marking criteria: Marks are allocated as follows: Section to be included in the report Description of the section Marks Requirements Requirement analysis for digital audio transmission and recoding 15 Current practices Literature review of the current waveform coders covering at least PCM and DPCM 20 Recent developments What new techniques are available and how they claim to overcome problems in the current methods 20 Reference style 5 Poor writing Inadequate structure, careless presentation, or the report exceeds the word limit by more or less than 10% -30 Plagiarism Type of plagiarism - Copy from other student - Copy from internet source/textbook - Copy from other sources -60 ME502 Overview of Digital Communications | Assignment 1 Individual PART B: µ-law and A-law Compander Design Using MATLAB/Simulink (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 is needed between the signals and the systems handling them. This interface is called analogue-to-digital converter (ADC) and its reciprocal, digital-to analogue converter (DAC). The three main components in the ADC are sampler, quantizer and encoder. Task: Implement in MATLAB/Simulink nonlinear quantizers µ-law and A-law compander and compare them. Learning Outcomes 1. Student demonstrates competence in programming in MATLAB. 2. Student demonstrates the ability to implement a function in a digital communication system in software. 3. Student demonstrates the understanding of analog-to-digital conversion (ADC), and its purpose in the entire transceiver of modern technologies such as UMTS/WCDMA and LTEAdvanced. Marking criteria: Marks are allocated as follows: Section to be included in the report Description of the section Marks MATLAB programming competence Does student demonstrate competence in programming in MATLAB? Does the code run? Does the code solve the intended problem? 5 ADC/DAC competence Does student demonstrate the ability to implement a function in a digital communication system in software? 2 Competence in modern technology Does student demonstrate the understanding of ADC/DAC, and its purpose in the entire transceiver of digital wireless communication systems? 5 Critical reflection Does the report demonstrate reflection and understanding of the topic or it was hastily written? 5 Research depth Does the student work demonstrate that the student consulted additional referenced materials on the topic and used the IEEE referencing style well? 5 ME502 Overview of Digital Communications | Assignment 1 Individual English grammar and coherence, and professional report writing Does the question posted contain good English, good grammar, admirable writing style, no typos, good format, etc.? Is the report void of cut-and-paste figures and tables? Are all graphics captioned and referenced appropriately in the report? 10 Plagiarism Did the student do any of these without reference and reflection? - Copy from other student(s) - Copy from Internet source/textbook - Copy from other sources -40 Extensions: Requests for an extension, accompanied by supporting documentation, must be received by the student in writing before 3 working days from the due date else penalties may apply for late submission without an approved extension. Special consideration form is available on level 8 reception. Penalties: Academic misconducts such as cheating and plagiarism may incur penalties ranging from a reduced result to program exclusion.