Report on the characteristics of sampling

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Reference no: EM131615477

Assessment - Source Coding Implementation Using MATLAB/Simulink Purpose of the assessment - Report on the characteristics of sampling and analogue to digital conversion and source coding;

Assignment Description:
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

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 real world applications of digital communication in digital audio transmission and recoding. Therefore, 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.

Requirements

The student needs to address the following three areas:
1) Requirement analysis: student is required to analyze the following for digital audio in telephone 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 telephony
- Typical bit rates used for local loops as well as on trunked lines;
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 for high quality audio.

2) Investigation of current methods: 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.

3) Investigation of new developments: student is required to do some research into the latest developments in waveform coding techniques for digital audio transmission and recoding.

PART B: Implementation of µ-law and A-law compander

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 it's reciprocal, digital-to analogue converter (DAC). The three main components in the ADC are sampler, quantizer and encoder.

Requirements

1) Implement nonlinear quantizers µ-law and A-law compander in MATLAB/Simulink and compare the result. Matlab/Simulink code is required to include in report.

2) Prepare a report incorporating theories behind the sampling, quantization and encoding. Report should include comparison result and its interpretation from the simulation.

Verified Expert

Work is about implementation of the speech processing laws for a signal. Various aspects of speech processing are discussed in this work including bandwidth, bit rate etc. Further waveform modulation schemes are discussed briefly. In last MATLAB is used for implementation.

Reference no: EM131615477

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len1615477

8/26/2017 7:47:33 AM

Explanation All elements are present and well integrated. Components present with good cohesion Components present and mostly well integrated Most components present Lacks structure. Reference style Clear styles with excellent source of references. Clear referencing/ style Generally good referencing/style Unclear referencing/style Lacks consistency with many errors Report structure and report presentation Proper writing. Professionally presented Properly written, with some minor deficiencies Mostly good, but some structure or presentation problems Acceptable presentation Poor structure, careless presentation

len1615477

8/26/2017 7:47:26 AM

Marking Rubric for Exercise Answers Grade Mark HD 80%+ D 70%-79% CR 60%-69% P 50%-59% Fail < 50% Excellent Very Good Good Satisfactory Unsatisfactory Evaluation Logic is clear and easy to follow with strong arguments Consistency logical and convincing Mostly consistent and convincing Adequate cohesion and conviction Argument is confused and disjointed Sophistication and effectivity The presented solution demonstrated an extreme degree of sophistication and effectivity to secure and/or manage WLAN The presented solution demonstrated a high degree of sophistication and effectivity to secure and/or manage WLAN The presented solution demonstrated an average degree of sophistication and effectivity to secure and/or manage WLAN The presented solution demonstrated a low degree of sophistication and effectivity to secure and/or manage WLAN The presented solution demonstrated a poor degree of sophistication and effectivity to secure and/or manage WLAN.

len1615477

8/26/2017 7:47:19 AM

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 voidof cut-and-paste figures and tables? Are all graphics captioned and referenced appropriately in the report? 5 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

len1615477

8/26/2017 7:47:08 AM

For Part B: 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? 15 ADC/DAC competence Does student demonstrate the ability to implement a function in a digital communication system in software? 5 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

len1615477

8/26/2017 7:46:56 AM

Marking criteria For Part A: 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 25 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 10 Reference style IEEE 5 Poor writing Inadequate structure, careless presentation, or the report exceeds the word limit by more or less than 10% -10 Plagiarism Type of plagiarism - Copy from other student - Copy from internet source/textbook - Copy from other sources -60

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