Product Introduction

We are pleased to introduce our Modern High-technology CD and LD products.

                   CD and LD products


*  CD-DA ( Compact Disc-Digital Audio )


The digital audio CD was the foreunner of all CD products. When Philips Corp, specified the appearance, size, shape, signal recoding method, and  other technical specifications in its ¡§Red Book¡¨ in 1981, the foundation for CD development was firmly in place. Today, the standard size for a CD-DA is 12 cm, and the standard digital storage format is 16 bits at 44.1KHZ. with its low distortion and digital storage, CD-recorded music retains high fidelity with being subject to molding, aging, or other deterioration. This has made the CD the leading medium for recorded music.



*  CD-ROM   ( Compact Disc-Read only Memory )


In 1985 the Philips Corporation issued the ¡§yellow Book¡¨, which specified the physical format for CD-ROM. This 12 cm disc stores any type of data in a purely digital format, including text, sounds, pictures, and animation. It considerably enriches the scope of the CD. The most common application of CD-ROM is in computers, where it is used to store Apple HFS, ISO9660, and DEC VMS file formats. These may be executed under Apple, DOS, and UNIX operating systems. As MPCs become increasingly widespread, the market for multimedia CD-ROM titles holds enormous potential for growth. Ritek produces titles for both MPC and Macintosh in many areas: encyclopedia, nature, English education, children¡¥s stories, music, and culture. This collection is continually being expanded in cooperation with other companies in the field.


*  CD-I  (Compact Disc-Interactive )


CD-I represents the multimedia specifications jointly developed by Philips, Sony, and Microware, and published in the¡§ Green Book¡¨ in 1986. CD-I can reasonably claim to be the world¡¥s first multimedia system incorporating ordinary home audio-video equipment, since it does not need to be connected with another computer, it is very convenient for the consumer to operate. Moreover, as MPEG technology matures, CD-I digital video capable of playing movies is likely to grow in popularity.


*  CD-V  ( Compact Disc - Video )


CD-V first appeared in 1987, combining 20 minutes of digital audio data and five minutes of analog video data. The CD-V¡¥s outside diameter has 20 minutes of music in music CD data format, while the inside diameter has five minutes of video using LD data. The CD-V is frequently used to record popular MTV video. The CD-V is played on an ordinary LD player. As the price for these drops and they become more common, the CD-V, with its smaller size and easier handling, is certain to explode in popularity.


*  CD-G  ( Compact Disc + Graphics )


In 1990, JVC developed CD-G technology, bring CDs into the graphics realm. In general, the data recorded on music CDs codes for sounds, and there is no leftover space to accommodate other data. However, CD-G technology uses a sub-code track running parallel to the main sound track. A portion of this blank space may be used to store simple pictures and text. Most of the CD-G playing equipment on the market today is used for karaoke systems.


*  Video CD  ( VCD or Compact Disc Digital Video )


The Video CD is the newest high-tech compact disc, specified by the 1993 ¡§white Book¡¨ to be the same size (12 cm) as a normal CD, the Video CD can record 74 minutes of fully digital, high-quality motion pictures accompanied by CD-quality sound. this landmark product is poised to compete with LDs and VHS for the video market. MPEG encoding is a key engineering pre-mastering step in Video CD manufacture. Ritek provides technical services for the conversion of D2 and Betacam master tapes into MPEG files to enable production of Video CD, MPEG CD-ROM, and CD-I digital video. In addition, Ritek cooperates with international video, karaoke, and record companies, acting as an agent for distribution of high-quality video CD titlesand opening up new horizons in digital audio-video entertainment.


*  CD-WORM (CD-R) ( Compact Disc-Write once, Read Many)


The specifications for the CD-WORM, also known as the CD-R ( CD recordable ) were laid out in the 1989 ¡§Orange Book¡¨, which included both CD-MO and CD-WORM writable discs, Part I defined CD-MO specifications, while part II defined CD-WORM specifications. These specs were for the CD-WORM medium itself, which can record data according to the standards of the ¡§Red Book¡¨, ¡§Yellow Book¡¨,¡§ Green Book¡¥, and ¡¨White Book¡§. Applications are far-ranging, including high level digital sound recording and high-capacity data storage for computers. It may also be used as a  master copy for testing and evaluation prior to mass production of CD-ROM, Video CD, or Photo-CD.


*  CD-MO  (Compact Disc-Magnetic Optical)

CD-MO is a rewritable CD system whose specifications are defined in part of the¡§ orange Book¡¨. It can be said to integrate MO and CD-ROM technology. Data on a CD-MO is organized according to the CLV method, while the MO spins according to the CAV method, CD-MO also incorporates the error correction calculation method and physical data format of the CD-ROM; However, its error detection method is the same as that for hard disks. At present, CD-MO technology is still in the developmental stage. There is much room for development for the prototype unveiled by Sony in 1990.


* LD (Laser Disc)

A laser disk combines digital sound data and analog video on a 30 cm disc. One side of  an LD can store a maximum of 60 minutes of motion pictures, They are currently used to play movies, karaoke, computer animation, and music-oriented programs, Ritek manufactures LDs to either CAV or CLV specifications.


*  MD ( Mini Disc )


The Mini Disc was successfully developed by Sony and unveiled in November, 1992, This 6.4 cm CD can be repeatedly written and read and has a capacity of 140MB, making it the most advanced data storage medium today. The MD is still focused primarily on the general music consumer market, although it can also be used for computers. It can record 74 minutes of sound.


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Weizhou International Co., Ltd

P.O. Box 1394 Kaohsiung City, Taiwan ROC

Tel: 886-7-7169249      Fax: 886-7-7169250