What is Jitter ?
Jitter is the measure of the variation from packet to packet in round-trip time. This measure is calculated as the standard deviation of the individual packets’ round-trip time. Ideally, the round-trip time and latency of all packets would be identical; however, in practice, this rarely occurs. Due to other data traffic or bandwidth constraints, some packets get delayed and take longer to make the trip. This variation is jitter.
On a CD the music data is written in a single, spiral-shaped track (the same as a record). Thus the data is given as a long chain of bits that ideally can be read continuously. In contrast to e. g. hard disks or disks, the data itself is not divided into sectors! A kind of “logical sector structure” is created on CD-ROMs by writing additional “sector marks” so the CD consists of single sectors for the computer again that can be accessed directly by the computer. On an Audio-CD these sector marks are missing. There is only a “time-code”, that is coded into the data. This time code indicates the position with a resolution of 1/75 seconds. (This time code is also used for the information on the display of the CD-player). If the computer now wants to read a certain position of an Audio-CD, the CD-ROM can not locate the position precisely (i.e. only accurate to within 1/75 of a second) because of the missing sector marks. Normally this isn’t a problem because when reading out you usually st
