Handling of public address equipment system: LCD, still camera & video camera

1. 1
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2. PRESENTATION
ON
HANDLING OF PUBLIC ADDRESS
EQUIPMENT SYSTEM- LIQUID CRYSTAL
DISPLAY(LCD), STILL CAMERA AND VIDEO
CAMERA
INSTRUCTOR
Dr. D. K. MEENA
RGSC, BHU
SPEAKER
NEHA TANDON
NISHU KUMARI
2
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3. PUBLIC ADDRESS SYSTEM
Public Address (P.A.) systems originated in
ancient Greece with the construction of
amphitheatres
“Public address system is a set of equipments to
amplify sound so that it is audible to a large
audience over a distance.”
Used in extension programmes involving a large
number of people such as mass meeting, training
programme, field day or farmer’s day, campaign,
exhibition etc.
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4. COMPONENTS OF PUBLIC ADDRESS
SYSTEM
 A public address system has three components:-
1.MICROPHONE/MIKE/MIC
• It is an acoustic-to-electric sensor that converts sound into
an electrical signal.
2.AMPLIFIER/ELECTRONIC AMPLIFIER/AMP
• It modulates the output of the power supply to make the
output signal stronger than the input signal.
3.LOUDSPEAKER/SPEAKER
• It is a device which convert an electrical audio signal into a
corresponding sound.
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COMPONENTS OF A PUBLIC ADDRESS SYSTEM
MICROPHONE
AMPLIFIER
LOUDSPEAKER

6. WORKING OF A PUBLIC ADDRESS
SYSTEM
The working of the PA system consists of 4 steps:-
1.Begins with a sound source (such as a human
voice), which creates waves of sound (acoustical
energy).
2.These waves are detected by a microphone, which
converts them to electrical energy.
3.This signal is amplified in an amplifier up to a
required level.
4.The loudspeaker converts the electrical signal
back into sound waves, which are heard by
human ears. 68/11/2016

7. TYPES OF PUBLIC ADDRESS SYSTEM
1.SMALL PA SYSTEMS
• Simplest PA systems consisting of a microphone, an
amplifier, and one or more loudspeakers.
2.LARGE PA SYSTEMS
• PA systems having speakers that cover an entire
campus of a college or industrial site.
3.LONG LINE PA SYSTEMS
• Any PA system across a wide geographic area, larger
than in large PA systems.
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8. LIQUID CRYSTAL DISPLAY(LCD)
A liquid-crystal display (LCD) is a flat-panel
display or electronic visual display.
They produce no light of their own
They require external light to produce a visible
image provided by backlights provided at the
back of the glass.
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9. LCD PROJECTOR
An LCD projector is a type of video projector
for displaying video, images or computer data
on a screen or other flat surface
LCD projectors typically send light from
a metal-halide lamp through a prism that
produces a wide range of colors and shades in
the projected image.
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10. USE OF LCD PROJECTOR IN EXTENSION
TEACHING PROGRAMMES
• Essence of a presentation
• Brings audio-visual inputs to the programme
• Inputs planned elsewhere in the world can be
brought into the programme
• Demonstrations
• Webinars
• Quizzes
• Lectures
• Group activities 108/11/2016

11. ADVANTAGES OF USING LCD PROJECTOR
• Low power consumption
• Unconstrained by geographical location of
device
• Clearer image display
• Can incorporate audio and video clips
• Easier note taking
• Greater teaching versatility
• Better use of class time
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12. THINGS TO BE KEPT IN MIND WHILE
USING A LCD PROJECTOR
Will the presentation hold the attention of the
audience?
Will it efficiently supplement what he/she is
going to present?
Can the audience read the presentations
without much delay?
Can the audience listen to the talk of the
presenter as well as read the text presented
and relate both?
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13. VIDEO CAMERA
A video camera is camera used to make
electronic motion pictures. It captures
moving images and synchronous sound.
WHY VIDEO CAMERA ?
It is a type of visual communication which
use moving pictures and sound to
tell stories or inform (help people to learn).
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14. 1. Lens
2. Viewfinder
3. Body
4. Shutter Release
5. Aperture
6. Image Sensor
7. Memory Card
8. LCD Screen
9. Flash
10. User Controls
MAJOR COMPONENT OF VIDEO CAMERA
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15. STILL VEDIO CAMERA
A still video camera is a type of
electronic camera that takes still images and stores
them as single frames of video.
The best known model’s include Sony Mavica,
Canon’s lon and Xapshot cameras.
The most common design has an image sensor
and basic processing hardware similar to that of a
domestic analog camcorder.
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16. 16
Canon RC-250 QPIC still
video camera
Prototype Sony Mavica still
video camera from 1981.
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17. 1. Media
2. Home video
3. Politics
4. In surveillance
5. Entertainment
6. Education
MOSTLY USED FOR
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