Compact Disc (CD), (VCD), (VCR/VTR)

Video tape recording (VTR)

- is a tape recorder designed to

record video material, usually on magnetic tape.

VTRs originated as individual tape reels, serving as a replacement for motion picture film stock and making recording for television applications cheaper and quicker.

1995 Panasonic D5 Digital VTR, model AJ-HD3700H.

1961 AMPEX Quadruplex The first "portable" VTR, the suitcase-

sized 1967

Sony to Discontinue Handheld Tape Recorders in 2013

New edition 2013

Advantages of Videotape recording:

are so much useful in order to make children mind sharper during studies.

increases so much interest of the young students who are keen to learn something

A voice recording can be recorded simultaneously with the recording of the image to identify the object and to explain what is being shown.

A whole tape can be duplicated commercially, or with two tape machines.

A library of visible light and infrared images, similar to the libraries of x-radiographs that many museums have, can be easily built up.

It is easy to compare a “freeze-frame” image on the monitor with a photographic print.

Disadvantages of Videotape recording:

No hard copy is produced

Viewing requires a video tape player and a monitor.

During the infrared scanning process, the VCR

records the slight vibration and temporarily out-of-

focus image produced while the camera is moving.

Comparison between infrared images on video tape

would require duplicate tapes and two

monitors.

Video Compact disc or VCD

Also known as (View CD, Compact Disc digital video) became the first

format for distributing films on standard 120 mm optical discs. The

format is a standard  digital format for storing  video on a  Compact

Disc. VCDs are playable in dedicated VCD players, most  DVD-Video

players,  personal computers and some video game consoles.

The VCD standard was created in 1993 by  Sony,  Philips, Matsushita,

and JVC  and is referred to as the  White Book   standard. Though

supplanted by the two formats, VCDs are still popular, particularly in

the low cost market.

 (VCD)  A storage  format  used  for  film  distribution. 

What uses can you come up with for a standard compact disc?

1.) Store data.2.) Store music.3.) Store video.4.) Throw at somebody!5.) Play frisbee!6.) Play video games.7.) A backup dinner plate!8.) A very "reflective" wedding ring.9.) Demonstrate the mathematical properties of circumsribed circles.10.) Look at under a microscope to see the "pits."11.) Break for no reason at all.12.) Roll around on its side as a fun game.13.) Make the weird rainbows that reflect off the back side.14.) Sell to someone else!15.) Christmas tree decoration!16.) A backup mirror.17.) Reflect light off of it into the eyes of someone who's attacking you. Also works with burglars.18.) Use for a craft requiring a circular object.19.) Stack some when you're bored.

Advantages of the VCD :

VCDs can be played on more hardware than any other media

VCDs are easy and inexpensive to produce VCDs are inexpensive to distribute VCDs are region code free

VCDs are a standard format, so you'll still be able to play them in 20 years

VCDs are a good fit for school video projects VCDs are ideal for training video

Disadvantages of the VCD: easily damage. Un-removable save limited data.

DVD( Digital Versatile Disc)

-is an  optical disc storage  format, invented and developed by Philips,  Sony , Toshiba , and  Panasonic in 1995. DVDs offer higher storage capacity than Compact Discs. while having the same dimensions.

DVDs are used in DVD-Video consumer digital video format and in DVD-Audio  consumer digital audio format, as well as for authoring AVCHD discs. DVDs containing other types of information may be referred to as DVD data discs.

 a medium of entertainment and as a data storage device.

DVD as Storage Device - Compact and Useful

Compared to CD the DVD has more tracks since

the pitch is reduced from 1600 nanometers to

740 nanometers and redundant information is

reduced to minimum and hence the capacity

can go up from 700 MB in case of CD to 4.5 GB

in case of DVD. Also, unlike CD, the information

can be stored in layers and on both sides of

DVD giving it the obvious advantage in terms of

size and cost.

ADVANTAGES OF DVD:

Superior Data Storage

High density

Duplication advantage

The full length movie can be stored in a single

DVD and the quality will not deteriorate over

the time as there is no contact between the

disk reader and the disk.

Portability

Disadvantages of DVD:

It will take years for movies and software to become widely available.

It can't record (yet).

It has built-in copy protection and regional lockout. It uses digital compression. Poorly compressed audio

or video may be blocky, fuzzy, harsh, The audio down mix process for stereo/Dolby

Surround can reduce dynamic range. It doesn't fully support HDTV. Some DVD players and drives may not be able to read

CD-Rs. First-generation DVD players and drives can't read

DVD-RAM discs. Current players can't play in reverse at normal speed.

For listening