EXPERIMENT 3 COMPOSITE VIDEO

PURPOSE:

• Getting to know the basic composite video.
• Measuring standard composite video and voltage.
• Determining the parameters of composite video. 

EQUIPMENT USED :

• 1 VCD / VTR
• 1 Oscilloscope 40 MHz and passive probe
• An RCA cable connector - BNC (75Ohm) 

Circuit diagram :

 

INTRODUCTION:   

Composite Video Signal Construction

        Composite video signal containing variations of the camera signal (image information), blanking pulses (blanking), and synchronization pulses (sync). 

Figure 1 Three sets of composite video signal is a variation of the camera signal, blanking pulses, and synchronizing pulses. (A) camera signals (image information) to a single horizontal line, (b) H blanking pulse signal is added to the camera, (c) Toll-alignment of H added to the pulse discharge. 

EXPERIMENT 2 MODULATOR VIDEO

Objectives:

1. Measuring the frequency spectrum of video transmission.
2. Determine the carrier frequency range image and sound carrier frequency.
3. Specifies the field width (bandwidth) on video transmission.
4. Specify the type of modulation on the picture and sound.



Equipment Used:
 
1 Modulator video (VCD / VTR / video sender).
1 A Spectrum Analyzer.
1 An RCA cable connector - BNC

Circuit diagram:

 Introduction:

           How to emit (transmit) signal is amplitude modulated image similar to a radio broadcasting system that has been known. In both cases, the amplitude of a carrier wave radio frequency (RF) is made varies with the modulating voltage. Modulation is a signal of fundamental frequency (baseband). On television, this baseband signal is a composite video signal. Broadcast television is really such a radio system, but includes pictures and sound. Sound signal emitted by joining in it frequency modulation (FM) on a separate carrier wave transmitter in the same channel as the image signal.

Understanding the image signal is used here to mean a modulated carrier wave. The video signal is a signal to a picture tube. Video signal to television audio signal corresponds to the sound system. 

Details are clearer than the image signal AM (amplitude modulation picture) and an FM voice signal.

 

EXPERIMENT 1. PATTERN GENERATOR

Objectives:
1.1 Getting to know the basic patterns in the Pattern Generator.
1.2 Measuring standard composite video and voltage on each pattern.
1.3 Measuring on the modulator wave modulated video (RF).
1.4 Measuring video IF.

Equipment Used:

1 Pattern Generator TV signal, LODESTAR CPG-1367A
1 Oscilloscope 40 MHz and passive probe
1 Power Supply
A cable connecting the BNC - BNC 75
A BNC connector cable - RCA 75
1 T-BNC Connector
Circuit diagram:

Introduction:

Source of image patterns (pattern generator) is the technique of video (television) for the purpose of setting up or finding fault. There are various kinds of image patterns with a variety of needs. Pattern of so many images that exist, there are several commonly used image patterns are not very specific uses.

EXPERIMENT 5 VIDEO CAMERA

Objectives:

1.1 Getting to know the video camera.
1.2 Measuring the composite video on a video camera.
1.3 Determining the parameters of composite video.

Equipment Used:
 
1 Video Camera
1 Oscilloscope 40 MHz and passive probe

1 RCA cable connector - BNC (75 W)

Introduction:

          A comprehensive idea of a TV camera function is depicted in Figure 3-2 and 3-3. In Figure 3-2 the camera is aimed at scene / view so that the optical image (optical image) can be focused on the target plate tube makers (pick-up tube). If you can look inside, you'll see the shadow-optical. The resulting video signal is shown by the oscilloscope waveform in the bottom left of the picture. Above is a monitor oscilloscope, which shows a reproduced image.