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ELECTRICAL AND ELECTRONIC ENGINEERING PROGRAMME

Assignment: Audio Signal Processing

SAFETY REGULATIONS AND GUIDELINES FOR STUDENTS

Students performing experimental work in the Engineering laboratory must follow and abide by the following safety regulations and guidelines. Students must complete a safety declaration form before they are allowed to work in the laboratory.

GENERAL

• Students are not allowed to enter the laboratory without the permission of the lecturer or laboratory assistant.

• Unauthorized experimental work in the laboratory is strictly forbidden.

• Prior to the use of laboratory out of timetabled periods, students must apply for usage from relevant laboratory staff.

• Students are not allowed to work alone in the laboratory.

• Bags and books must not be left on benches or on stools and should be placed in designated area. Do not block passageways or fire exits.

• All working spaces must always be kept clean.

• Long hair, ties, jewellery and clothing must never be allowed to hang loose, since any of these items can easily become entangled in the moving parts of machinery, and hence cause serious injury.

• Suitable clothing must be worn; long trousers or jeans are recommended for boys and dresses, slacks or jeans for girls. In particular, sleeveless t-shirts and sleeveless blouses are prohibited.

• Students must wear covered footwear during laboratory and workshop sessions. Sandals, open-toed shoes, slippers or similar footwear are prohibited. Students may be refused entry to the laboratory or workshop if not in proper footwear.

• Storage and/or consumption of food and drink, smoking and the application of cosmetics in the laboratory are not allowed.

• Indiscipline in the laboratory or workshop (e.g., whistling, horseplay etc.) will not be tolerated.

• No reagent, solution or apparatus is to be removed from the laboratory without approval from the lecturer.

• Do not pour waste down the sink unless authorized to do so by your lecturer.

• Defective equipment or broken glassware must be reported to the lecturer or lab assistant.

• Do not run in the laboratory or along corridors. Exercise care when opening and closing doors on entering and leaving the laboratory.

• Laboratory doors must be kept closed at all times during practical classes.

OBJECTIVES:

After completing the assignment, you should be able to:

▪ Record and playback speech signal using MATLAB

▪ Design filter to eliminate noise in speech signals

INTRODUCTION:

In this assignment, you will explore the properties of time-domain signals using MATLAB simulation. A speech signal that was polluted with noise will be investigated. Low-pass, highpass, and/or band-pass filters will be designed to reduce noise level of the given time-domain signal.

EQUIPMENTS / MATERIALS:

This assignment will be conducted and run on MATLAB. You may use any suitable built-in functions provided officially by MATLAB in this assignment. The following functions of low pass filter (LPF), might be useful for this assignment.

ASSIGNMENT:

Filtering of a Noisy Audio File

You have to record a 5 seconds speech signal, playable from. By applying signal analysis methods and signal operations that you have learned in this module, extract a clean speech signal with minimal noise by using MATLAB. Play the filtered speech again to verify your result.

REPORT:

Assignment should be submitted online in a standard report format in PDF filetype, including the following sections:

1. Cover Page: Name, student ID, title of assignment, date of submission

2. Second Page: Marking Rubric

3. Abstract

4. Introduction

5. Materials and Methods

a. Any theoretical support and/or mathematical evaluation on your work

b. Explanation of any functions used in MATLAB

6. Results and Discussions

a. Show complete MATLAB codes (single or multiple *.m files)

b. Any meaningful plots as evident to your work

c. YouTube link to the a short clip recording the filtered audio file(s)

d. Discussion on the results and limitations

7. Conclusion

8. References

* Penalty of 10% final score will be applied on each day for late submission of the report.

Plagiarism score must not exceed 20%.

MARKING RUBRICS:

The total score of the assignment will be 100, which will be then converted to 20% of the final grade. The assignment will be assessed with the following rubrics: