The Era Of Minidisc
>> วันศุกร์ที่ 27 พฤศจิกายน พ.ศ. 2552
The MiniDisc (MD) was first introduced to the market by Sony in 1992 as a replacement for the audio cassette. Developed in the late 1980s, MD uses a magneto-optical system for real time data on a rewritable disk to save document. The data can be freely accessed, that are looking for fast and easy processing time compared to linear access the tape media. The data were coded and stored in a compressed format called Adaptive Transform Acoustic Coding (ATRAC). TheATRAC compression rate of 292kbps, called SP, for 60, 74 allowed, and 80 minutes of music on a DVD, 20, could hold 25 are stored, and 28 minutes music Cdaudio quality. WAV format.
The first machine was the MD MZ-1 recorder, the approximately U.S. $ 750 sold at retail. It was line inputs for optical, RCA audio single-line-and microphone. There are headphone and line outputs for optical, but optical line-out was an option that was set by later versionsof portable MD units. Sony MD-licensed technology to other companies and soon Kenwood, Panasonic, Sharp, and others were the release of their own MD units, both stand-alone recorder and player. To facilitate integration of MD as a substitute for the central cassette, Sony offered the first home MD deck, MDS-101, and the first in-dash separator, C670RDS, in 1994. During the 90s and decided in the next ten years, MD unchallenged as the medium for portable audio and recordingEast Asia, but never a mainstream following in North America and Europe.
In 2000, Sony introduced a new coding method, MiniDisc Long Play (MDLP), had the two formats LP2 and LP4. LP2 extends the capacity of a 80-minute CD to 160 minutes of recording data at a compression rate of 132 kbps and LP4 expands the capacity of a 80-minute CD to 320 minutes with 66kbps. Both SP and LP2 uses separate stereo coding with discrete left and right channels, while LP4 uses commonStereo coding.
In 2002 Sony introduced NetMD, which allows for the transfer of music files from computer to MD via USB port. The SonicStage software (SS), quickly developed a bad reputation for freezing systems, the possibility of errors with operations successfully performed minutes earlier, restrictions on the number of runs can be checked, and requires large amounts of system resources for the operation. While the SS, today SonicStage CP (SSCP), has a toouser-friendly and streamlined program, are the memories of their first publication and updating of product or DAP users and reviewers when considering new Sony recalled devices.
The marketing of Sony also caused the indignation of the new users to MD via NetMD. On their websites, and about the products, said that Sony NetMD capable of playing MP3 files. What Sony did not clarify the MP3 file, the SS had only arrived in the ATRAC-encoded before it is transferred to MD. The importingand recoding of added time to the transfer to disc completely reduced and the quality of the original MP3 file.
Retailers of NetMD products also added to the negative sentiment by selling the goods on merit, they do not have. Not familiar with NetMD, many retailers are mistakenly informed customers, the files can be transferred from the NetMD device to the computer. Based on this information, the user files are transferred to an MD disc and would delete the source file from your computerthought it had to reload at a later date available. The two-way transfer of files between your computer and MD not come about until the release of Hi-MD.
In 2004, Sony redesigned the MD product line with the introduction of Hi-MD. The new format launched Disk 1GB memory is connected, not backward-compatible with Hi-MD discs, the ability to use Hi-MD as a USB, and encodes the ability to upload files in the Hi-MD ATRAC formats. For the field recorder, the largestImprovement include the possibility of files in an uncompressed format as Linear PCM, which easily re-encoded at CD quality. Wav files. Unfortunately, no other company decided to release Hi-MD portable units, but Onkyo Hi-MD has a number of home shelf stereo systems and mini-component systems. While Hi-MD has never been the way to home or car deck, still companies like Marantz, Teac, Kenwood and releasing the position MDLP decks for such situations.
Thelatest release of a portable MD unit was the Hi-MD recorder, MZ-RH1, in April 2006. This unit expands on the upload capacity of the first Hi-MD units by allowing the upload of files in the Hi-MD pre-encoded file formats. This could be a sign that Sony wants the MD legacy by enabling users to move all their data from MD and into their computer for free.
Regardless, the next step from Sony, the MD format has many supporters, both casual and diehards. The ability to copy music tofrom external sources in real time without relying on a computer keeps many radio users in the fold. Made with the number of units and blank styles available in the past 15 years have developed the collectors who like to walk with her and show her collection on the Internet and any person who are willing to seek. Casual users of portable audio, field recordist and radio ", and Collector MD is alive, even if the manufacturers to release any other products. MDa format that creates a little more personal attention than the download of an online music store and we can connect with the music and the media can not be replaced by drip, demands and pull digital audio player.
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