Electronic skip protection is a memory buffer system used mainly in some portable Compact Disc (CD) players and all MiniDisc (MD) units. The Compact Disc logo was inspired by that of the previous Compact Cassette. ... // Overview The MiniDisc logo A MiniDisc (MD) is a disc-based data storage device intended for storage of digitized audio. ...

Technology

When the buffering circuitry is in operation, the compact disc is read at a fixed read speed or CAV and the content is buffered (with optional ADPCM compression) and fed to RAM within the player. The audio content is read from RAM, optionally decompressed, and then sent to the amplifier. When the disc reading is interrupted, the player momentarily reads the data stored in RAM while the tracking circuitry finds the passage prior to the interruption on the CD. Constant Angular Velocity (CAV) refers to how information is written to or read from a rotating data disk. ... Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code. ... Sharma Ram (disambiguation) Ram Sharma is an amazing, talented teenager that lives in Canada His talents include rapping, comedy, and cooking He is bound to success! ... For the British rock band of the same name, see Amplifier (band) An amplifier can be considered to be any device that uses a small amount of energy to control a source of a larger amount of energy, although the term today usually refers to an electronic amplifier. ...

Another method has the disc rotating at variable or CLV speed (the normal rotation method for a CD player), but at a slightly higher speed than with the buffer feature switched off. The buffer method is the same as before. Constant Linear Velocity (CLV) refers to how information is written to or read from a rotating data disk. ...

History

The technology surfaced around 1992-1993 as a physically smaller alternative to the bulky rubber shock absorbers utilized in portable players at the time. It much reduced the size of the hitherto bulky players designed for use in moving cars, in particular. Small rubber shock absorbers are still used, but are less effective than the bigger pre-1993 ones.

When first introduced, 3 seconds was the maximum buffering time. As of 2006 times range from 10 seconds to "skip-free," where the player will rarely skip.

Due to the nature of the ATRAC compression scheme, and to ensure uninterrupted playback in the presence of fragmentation, all MD decks and portables buffered at least 10 seconds when the format was introduced in 1992. As of 2006, MD units have much bigger buffers. ATRAC (Adaptive TRansform Acoustic Coding) is a proprietary audio compression algorithm used to store information on Minidiscs and other Sony-branded audio players. ... In computer storage, there are three related uses of the term fragmentation: external fragmentation, internal fragmentation, and data fragmentation, all related to storage. ... // Overview The MiniDisc logo A MiniDisc (MD) is a disc-based data storage device intended for storage of digitized audio. ...

Pros

• Interruption-free performance.

Cons

• Audio quality may be slightly worsened due to compression artifacts when the system is in use. Quality is improved with uncompressed buffering.

• Battery life is shortened due to the fixed (CAV) read speed of the disc and power required by the memory.
  • Older players (1992-1997) had at most half the battery life when the skip protection system was in use.
  • Players from 1997 have more power-efficient skip protection.

Trade Names

"ESP", "Anti-Skip", "Anti-Shock", "Joggable" "G-Shock Protection" (Used by Sony), etc. This article or section does not cite its references or sources. ...