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Mini Project

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EE2031 Circuit and Systems Design Lab

Mini-Project Report
Voice Disguiser
Presented by:
Friday Room 3 Group 7
Wang Ke (A0105276J)
Wu Jianxiao (A0099910W)

1.Introduction
1.1 Aim
During the 6 hands-on individual labs before this mini project, we have learnt the design and implementation of filter and oscillator, together with applied characterization of different components. The objective of Mini-Project was for students to demonstrate their innovative design skills and implement knowledge learnt in lectures to real-life product design. Therefore, we aimed to integrate what we learnt in individual labs into one single product, which is a Voice
Disguiser that can solve practical problems of witness protection.

1.2 Motivations and Inspiration
According to Maslow’s Hierarchy of Needs, safety is the second most basic need of human being. However, in some lawsuit trail and media interviews, the safety of witnesses is at risk when they come forward to disclose the truth. A study of Columbia University shows that 71% of witnesses said they feel threatened by the offenders (Brendan & Rajiv, 2007). Therefore, it is necessary to use a Voice disguiser to protect witnesses from being recognized based on their originally identifiable voice. And this issue inspires me to design a voice disguiser. After consulting lab TAs and lecturer, we found that this idea is feasible based on limited lab conditions and time constrains

1.3 List of Materials
No.
1
3
4
5
6
7
8
9
10
11

Circuit Section
Voice Disguiser

Volume Display

Description
Audio Socket
Op Amp
Trimmer
Resistor
Capacitor
Diode
Switch
Op Amp
LED
Resistor

Model
LM358
10k

LM357 green Quantity
2
5
2
26
4
3
1
4
7
8

Table 1: Table Of All Components Used In Different Circuit Sections

2. Circuit Schematics And Characterizations
2.1 Project

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