Handling of public address equipment system

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

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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 4/11/2016

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. 3 4/11/2016

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. 4 4/11/2016

5. 4/11/2016 5 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. 6 4/11/2016

7. TYPES OF PUBLIC ADDRESS SYSTEM 1.SMALL PA SYSTEMS S implest 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. 7 4/11/2016

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. 8 4/11/2016

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. 4/11/2016 9

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 10 4/11/2016

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 11 4/11/2016

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? 12 4/11/2016

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). 13 4/11/2016

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 Contro ls MAJOR COMPONENT OF VIDEO CAMERA 14 4/11/2016

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. 15 4/11/2016

16. 16 Canon RC-250 QPIC still video camera Prototype Sony Mavica still video camera from 1981. 4/11/2016

17. 1. Media 2. Home video 3. Politics 4. In surveillance 5. Entertainment 6. Education MOSTLY USED FOR 17 4/11/2016

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