UNIT 21 ASSIGNMENT 1

Future of TV Article 

Audio and Video Signals  

There are different confusing letters and words to describe audio and video signals here is a list of what these things do...

• AES EBU Digital Audio AES/EBU - is a balanced, digital audio transfer standard that uses an XLR connector with a single cable carrying  left-channel and right-channel audio data.

• Composite - Composite Video is a single signal which carries both the chrominance (color) and luminance (brightness) components of a video signal, along with sync information, on a single wire. 

• CVBS -  "Color, Video, Blank & Sync"

• DVI - DVI (Digital Video Interface) is a video interface standard used primarily with flat panel LCD monitors and high-end video graphics cards. 

• DVI-A - DVI-A (Analogue format) is  just the RGBHV signal format using a different connector.

• HDMIT - High Definition Media Interface is a signal format, backwardly compatible with DVI-D and employing the same encoding/decoding scheme. Video is kept in uncompressed digital format and 8-channel audio is offered. Combines a digital audio and a digital video cable into a single connector. The video signals on HDMI are backwardly compatible with DVI-D.

• IEEE1394 - An external bus standard that supports data transfer rates of up to 400Mbps (1394a) and 800Mbps (1394b). It also supports isochronous data - delivering data at a guaranteed rate, making it ideal for devices that need to transfer high levels of data in real-time, such as video devices.

• Y/Pb/Pr - In Y/Pb/Pr Component Video, there is a luminance channel, "Y," which carries the luminance along with the sync pulses, and two colour-difference channels, which carry signals representing Blue minus Luminance (B-Y, or Pb) and Red minus Luminance (R-Y, or Pr). From these signals, the display device separates out the sync information and reconstitutes the red, green and blue components of the picture. Just as s-video requires two signal-carrying wires instead of one, component video requires three  connections color-coded green (Y, or Luminance), blue (Pb) and red (Pr). RGBHV will usually, though not always, be color-coded red, green, blue, yellow (horizontal sync) and white (vertical sync).

Which is better HD or standard definition, prove it with research?

HD is better than standard definition, this is because the visual is less pixilated, meaning the visual is clearer and it also makes smaller details blend into the action. Because HD is clearer it also means that key elements of the action that may be small but important are clearer and stand out more as the details are shown in a much better quality. 

You can see by this picture that the Standard Definition is poorer quality than High Definition.





What was terrestrial TV? Why was it turned off?

Terrestrial TV is a type of television broadcasting using radio signals for transmission and television antennas and tuners for reception. Terrestrial television is the first system of television broadcast and the BBC began broadcasting in 1929, and had a regular schedule of television programmes in 1930. There was virtually no other method of television delivery until the 1950s with the beginnings of cable television. Terrestrial TV became outdated like many other things in life and something better was invented which was cable television.  


What are the different types of digital filming and storage?

Digital memory cards are used to store digital film, memory cards are removable, and quite a few different types are available. DSLRs mainly use Compact Flash, but other formats, such as SD cards, are becoming more popular. Compact cameras use a wider range of cards.

Different types of digital filming and storage are Compact Flash (CF), Secure Digital (SD)

Sony Memory Stick (MS), MultiMediaCard (MMC) / SecureMultiMediaCard (SecureMMC).