The video format we will be using this term is Digital video, what is the other, older format that was used recently.
The other, older format that was used recently was the analog video.
Describe the difference between the two formats.
Analog signals are made up of continuously varying waveforms. The value of the signal can be given at any given time, can be anywhere in the range of minimum and maximum .Digital signals are transmitted only as precise points selected at intervals on the curve. The type of digital video that can be used on the computer is binary, describing these points as a series of minimum and maximum values- minimum represents zero and maximum one.
Analog Signal
The other, older format that was used recently was the analog video.
Describe the difference between the two formats.
Analog signals are made up of continuously varying waveforms. The value of the signal can be given at any given time, can be anywhere in the range of minimum and maximum .Digital signals are transmitted only as precise points selected at intervals on the curve. The type of digital video that can be used on the computer is binary, describing these points as a series of minimum and maximum values- minimum represents zero and maximum one.
Analog Signal
Digital Signal
Binary Signal
What are some advantages of digital video?
There are many advantages of Digital video, the most very important on is very high fidelity of transmission as to supposed to analog. With a digital signal, it is much easier to distinguish the original
Information from the noise. So a digital signal can be transmitted and duplicated as often as we wish with no loss in fidelity.
What is meant by frame rate in video?
The number of pictures being showed per second is called the frame rate. It takes a frame rate of about 10 frames per second for us to perceive smooth motion. Higher frame rates make for smoother playback.
Do all applications use the same frame rate, explain your answer?
No, because everyone wouldn’t use the same number of frame rates and/or the same type of video – Analog or Digital Video.
What is meant by resolution, how is it measured?
The quality of the movies you watch is not only dependant upon frame rate. The amount of information in each frame is also a factor. Tis is known as a resolution of a image. Resolution is normally represented by the number of individual picture elements that are on the screen, and is expressed as a number of horizontal pixels times the number of vertical pixels e.g. 640x480
What is the colour system called RGB?
RGB stands for Red, Green and Blue components of a colour. Computers monitor display RGB colour. Each pixel we see is actually the product of the light coming from a red, green, and a blue phosphor
Blue components of a color. Our computer monitors display RGB color. Each pixel we see is actually
the product of the light coming from a red, a green, and a blue phosphor placed very close together.
Because these phosphors are so close together, our eyes blend the primary light colors so that we
perceive a single colored dot. The three different color components — Red, Green, and Blue —
are often referred to as the channels of a computer image.
Explain the video standards PAL, NTSC, and SECAM, what are the main differences between them.
The SECAM format is only used for broadcasting. In countries employing the SECAM standard, PAL format cameras and decks are used. Remember that the video standard is different from the videotape format. For example, a VHS format video can have either NTSC or PAL video recorded on it.
Which standard do we use in Australia?
Australia uses PAL.
For what type of video camera would you need to have a Video Capture Card in your computer to download?
Many computer system now ship with the IEEE 1394 interface as a standard feature. Your card choice will depend upon how you answered the questions posed above. In many cases, once you have determined your card that will also determine your computer. This is because many types of cards are only available for one type of computer platform. There are video cards. These are:
1. Types of analogue video input/output supported
2. Types of digital video input/ output supported
3. Types of video compression supported
4. Types of special processing supported
5. Types of software included
6. Types of audio supported.
What is an IEEE 1394 port?
The IEEE 1394 interface can be used for many others
Connections as well, such as hard drives, scanners, and networking. The simplest kind of card available is the IEEE 1394 interface card. This card is used to add the IEEE 1394 interface to computers that did not ship with one. This card does not support any analogue video. Many computer systems now ship with the IEEE 1394 interface as a standard feature.
Why do digital video cameras use video compression?
Digital video cameras use video compression because it will take a large amount of space. Compression is necessary because of the enormous amount of data that comprises uncompressed video.
A single frame of uncompressed video takes about 1 megabyte (MB) of space to store. You can calculate this by multiplying the horizontal resolution (720 pixels) by the vertical resolution (486 pixels), and then multiplying by 3 bytes for the RGB colour information.
Describe what a codec is.
Codec’s may be found in hardware — for example, in DV camcorders or capture cards — or in software. Some codec’s have a fixed compression ratio and therefore a fixed data rate. Others can compress each frame a different amount depending on its content, resulting in a data rate that can vary over time.
What is meant by generation loss, where does it happen?
Generation loss does not occur when copying digital video unless it is repeatedly compressed and decompressed.
No, because everyone wouldn’t use the same number of frame rates and/or the same type of video – Analog or Digital Video.
What is meant by resolution, how is it measured?
The quality of the movies you watch is not only dependant upon frame rate. The amount of information in each frame is also a factor. Tis is known as a resolution of a image. Resolution is normally represented by the number of individual picture elements that are on the screen, and is expressed as a number of horizontal pixels times the number of vertical pixels e.g. 640x480
What is the colour system called RGB?
RGB stands for Red, Green and Blue components of a colour. Computers monitor display RGB colour. Each pixel we see is actually the product of the light coming from a red, green, and a blue phosphor
Blue components of a color. Our computer monitors display RGB color. Each pixel we see is actually
the product of the light coming from a red, a green, and a blue phosphor placed very close together.
Because these phosphors are so close together, our eyes blend the primary light colors so that we
perceive a single colored dot. The three different color components — Red, Green, and Blue —
are often referred to as the channels of a computer image.
Explain the video standards PAL, NTSC, and SECAM, what are the main differences between them.
The SECAM format is only used for broadcasting. In countries employing the SECAM standard, PAL format cameras and decks are used. Remember that the video standard is different from the videotape format. For example, a VHS format video can have either NTSC or PAL video recorded on it.
Which standard do we use in Australia?
Australia uses PAL.
For what type of video camera would you need to have a Video Capture Card in your computer to download?
Many computer system now ship with the IEEE 1394 interface as a standard feature. Your card choice will depend upon how you answered the questions posed above. In many cases, once you have determined your card that will also determine your computer. This is because many types of cards are only available for one type of computer platform. There are video cards. These are:
1. Types of analogue video input/output supported
2. Types of digital video input/ output supported
3. Types of video compression supported
4. Types of special processing supported
5. Types of software included
6. Types of audio supported.
What is an IEEE 1394 port?
The IEEE 1394 interface can be used for many others
Connections as well, such as hard drives, scanners, and networking. The simplest kind of card available is the IEEE 1394 interface card. This card is used to add the IEEE 1394 interface to computers that did not ship with one. This card does not support any analogue video. Many computer systems now ship with the IEEE 1394 interface as a standard feature.
Why do digital video cameras use video compression?
Digital video cameras use video compression because it will take a large amount of space. Compression is necessary because of the enormous amount of data that comprises uncompressed video.
A single frame of uncompressed video takes about 1 megabyte (MB) of space to store. You can calculate this by multiplying the horizontal resolution (720 pixels) by the vertical resolution (486 pixels), and then multiplying by 3 bytes for the RGB colour information.
Describe what a codec is.
Codec’s may be found in hardware — for example, in DV camcorders or capture cards — or in software. Some codec’s have a fixed compression ratio and therefore a fixed data rate. Others can compress each frame a different amount depending on its content, resulting in a data rate that can vary over time.
What is meant by generation loss, where does it happen?
Generation loss does not occur when copying digital video unless it is repeatedly compressed and decompressed.
