mid term project presentation on 4-channel video multiplexer

8/6/2019 mid term project presentation on 4-channel video multiplexer

1/14

PROJECT SUPERVISOR:ER. KIRAN THAPA

PREPARED BY:Anil rai (804012)

Deependra shrestha (804021)Nirmal shrestha (804030)

AUGUST 3 , 2011

AMID TERM PROJECT REPORT

PRESENTATION ON4-CHANNEL VIDEO MULTIPLEXER


2/14

WHY VIDEO MUX:

y Two cases:

y In NASA-MISSION CONTROL look, there is a onemonitor assigned for one camera and watched by a

single control person. With that type of arrangement,youd have to watch only one screen instead ofhaving to scan a wall of CRTs

y Similarly, a commercial video switcher with picture

in picture is also available in market which cost veryhigh

y So a viable alternative is to build your own


3/14

INTRODUCTION

y Is basically a video switcher

y Can switch over the available video inputs from number

of cameras or any other Composite Video Signal sources

y Video switching can be done manually as well asautomatically at a rate defined by users convenience


4/14

OBJECTIVES

y To design a system that switches number of videos

available from different sources alternatively

y To design a economical video switcher

y To be able to record the videos being displayed


5/14

AIM OF THE PROJECT

y To build a 4-Channel Video Multiplexer


6/14

GENERAL BLOCK DIAGRAM:

MULTIPLEXER

DECADE COUNTER RESET SWITCHMULTIVIBRATOR

LED INDICATOR


7/14

SIMULATED CIRCUIT DIAGRAM


8/14

DESCRIPTION OF THE PROJECT

y The heart of this video multiplexer is a MaximMAX454. That integrated a 4 way videomultiplexer and an amplifier that operates as alow impedance line driver.

y The resulting video output is high quality withvery low phase distortion.

y The video inputs are selected by applying abinary number to the address inputs.


9/14

DESCRIPTION OF THE PROJECT

(CONTD)

y Binary addressing circuit is a decade counter

y Clock pulse for the counter is generated by timer circuit

that is adjusted in astable multivibration mode

y Video sequencing can be done manually as well asautomatically

y In automatic mode the videos are switched at a rate

defined by RC time constant in timer circuit

y Video input can be taken from CCTV camera, DVD

player, or TV antenna

y Video output can be given directly to a TV or system

through TV card


10/14

TASKS COMPLETED

y Preliminary study

y Field visits and discussion with concerned expertise

y Requirement analysis

y Circuitry design

y Simulation of the overall circuit via Proteus

y Circuit verification in bread board

y

Component placement and soldering in dot matrix board


11/14

TASKS REMAINING

y Replacement of Multiplexer IC with its equivalent relay

circuit with optocoupler isolation from the main control

circuit

y BNC jack and BNC cable connection to the circuit andcameras

y Video source collection( Camera or DVD player)

y PC interfacing through VGA card or TV card

y Enquiring the possibility for video recording on hard disk


12/14

PROGRESS OF REMAININGACTIVITIES

y Relay circuit:35% complete

y Power supply:50%

y Implementation on PCB: 70%


13/14

CONCLUSION

y All the components that were available are physically

tested ,simulated , placed in dot matrix board except those

that arrived later

y Overall progress: 60% completed


14/14

THANK YOU!

Documents

mid term project presentation on 4-channel video multiplexer