Microphone presentation's slides

1. I/O DEVICES
SUBJECT: English for Computer Science
Semester 2 - 2024 - 2025
Trần Quang Minh

2. INTRODUCTION
1. What is a microphone
and how it was invented
2. Structure and working
principle of microphone
3. Types of microphone
4. Applications of
microphone
Nguyễn Thành Tài - 23110309
Trần Quang Minh - 23110269
Trần Trí Tình - 23110341
Huỳnh Duy Nguyên - 23110270
Trần Quang Minh

3. TERMINOLOGY
Microphone (Mic) – Micrô (thiết bị thu âm)
Acoustic signals – Tín hiệu âm thanh
Broadcasting – Phát thanh, truyền hình
Speech recognition – Nhận diện giọng nói
Carbon Microphone – Micrô than
Diaphragm – Màng rung
Transducer – Bộ chuyển đổi tín hiệu
Electromagnetic induction – Cảm ứng điện từ
Piezoelectric effect – Hiệu ứng áp điện
Preamplifier – Bộ tiền khuếch đại
Phantom power – Nguồn điện ảo (48V)
Ribbon Microphone – Micrô dải băng
Surveillance – Giám sát
Voice recognition – Nhận diện giọng nói
Trần Quang Minh

4. What is a
microphone
&
how it was
invented
- Captures sound and converts acoustic
signals into electrical signals.
- Acts as an intermediary between the
sound source and the listener.
Microphone – Audio Input Device
Nguyễn Thành Tài

5. What is a
microphone
&
How it was
invented
Such a genius invention!!!
First Appearance & Inventor (1876)
- Alexander Graham Bell invented the
telephone transmitter.
- Elisha Gray developed a similar device.
Nguyễn Thành Tài

6. What is a
microphone
&
How it was
invented
Such a genius invention!!!
- Emile Berliner invented the carbon
microphone and sold the patent to Bell
Telephone Company.
- Thomas Edison improved its sensitivity
and audio quality.
Nguyễn Thành Tài

7. Types of
microphone
Microphone’s Components
1.Diaphragm: plastic (Mylar) or lightweight metal.
2.Transducer: copper coil, metal ribbon, or
piezoelectric crystal.
3.Preamplifier (if applicable): contains electronic
circuits and transistors.
4.Wiring and output interface: copper wires and
metal connectors.
5.Protective casing: metal or durable plastic
Trần Quang Minh

8. Structure
&
Working
principle of
microphone
Microphone’s working priciple
Sound wave reception
Conversion to electrical signal
Diaphragm vibration
Output devices’s process
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9. Structure
&
Working
principle of
microphone
Universe of microphones
Dynamic Microphone
Works via electromagnetic induction.
Durable, affordable, ideal for live performances and
instrument recording.
Condenser Microphone
- Uses a diaphragm and metal plate.
- Requires phantom power (48V), high sensitivity, used in
studios & broadcasting.
Trần Trí Tình

10. Structure
&
Working
principle of
microphone
Universe of microphones
Piezoelectric Microphone
- Uses the piezoelectric effect.
- Used in specialized applications.
Ribbon Microphone
- A thin metal ribbon vibrates produce
sound.
- Suitable for classical instruments but
fragile.
Trần Trí Tình

11. Structure
&
Working
principle of
microphone
Universe of microphones
Carbon Microphone
Uses carbon granules to convert sound pressure into signals.
Limited sound quality, historically used in the early time.
Besides traditional types, MEMS
microphones, laser microphones
and hydrophones used to
specific needs.
Trần Trí Tình

12. Applications
of
microphone
Microphone in our life
Communication
Used in online meetings,
public speaking, broadcasting,
and by teachers, journalists,
and politicians for clear voice
projection.
Entertainment & Media
Essential for concerts,
recordings, films, podcasts,
and content creators to
enhance audio quality.
Huỳnh Duy Nguyên

13. Applications
of
microphone
Microphone in our life
Security
Used in walkie-talkies, body
cameras, and sound recognition
systems for detecting threats.
Science & Technology
Found in electronic stethoscopes, voice assistants
(Siri, Alexa), and other speech-based technologies.
Huỳnh Duy Nguyên

14. CONCLUSION
Microphones convert sound into
electrical signals, revolutionizing
communication, entertainment, and
technology. As they evolve, they
remain essential for innovation and
daily life.
Trần Quang Minh

15. REVIEW QUESTION
1. What is the main function of a microphone?
A. Playing music
B. Capturing and converting sound into an
electrical signal
C. Increasing speaker volume
D. Recording images
Trần Quang Minh

16. REVIEW QUESTION
2. Who invented the carbon microphone – the first
practical microphone?
A. Alexander Graham Bell
B. Thomas Edison
C. Emile Berliner
D. Elisha Gray
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17. REVIEW QUESTION
3. Which component of a microphone is responsible for
detecting and vibrating according to sound waves?
A. Preamplifier
B. Diaphragm
C. Transducer
D. Protective Casing
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18. REVIEW QUESTION
4. How does a condenser microphone work?
A. Electromagnetic induction
B. Piezoelectric effect
C. Capacitance change
D. Vibration of a metal ribbon in a magnetic field
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19. REVIEW QUESTION
5. Which type of microphone is commonly used in live
performances due to its durability?
A. Ribbon Microphone
B. Condenser Microphone
C. Dynamic Microphone
D. Piezoelectric Microphone
Trần Quang Minh

20. REVIEW QUESTION
6. Which of the following is NOT a common application
of microphones?
A. Communication and broadcasting
B. Security and surveillance
C. Night photography
D. Artificial intelligence (AI) assistance
Trần Quang Minh

21. REVIEW QUESTION
7. Why is a microphone important in aviation?
A. To record flight journeys
B. To help pilots communicate with air traffic
controllers
C. To entertain pilots during flights
D. To capture engine sounds for performance analysis
Trần Quang Minh

22. THANK FOR YOUR ATTENTION