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OPC (Optimum Power Control)
OPC is a function that checks the loaded disc and automatically adjusts the laser for optimum recording setting before
recording.
PCA (Power Calibration Area)
A space reserved at the beginning of a CD-R/CD-RW for calibrating the laser output power required to record on that disc.
PMA (Program Memory Area)
A temporary memory area on a CD-R/CD-RW, where the information about the recordings on the disc—track numbers, tracks’
start points and end points, etc. is stored until the disc is finalized.
When the disc is finalized, this information is written in the TOC (see below).
Sampling Frequency
When analog signal are converted into digital signals, they are divided into many points and digitized. This dividing method is
called “sampling.” The sampling frequency indicates how many points one second is divided into—for example, for CD sound,
one second is divided into 44 100 points since its sampling frequency is 44.1 kHz.
SCMS (Serial Copy Management System)
Digital audio components, such as CD recorder, MD (Mini-Disc) recorder and DAT (Digital Audio Tape) recorder, can exchange
audio signal in the digital forms through digital input/output terminals. The digital audio components allow digital copy of music
signal with little deterioration. This has made it necessary to have a copy restriction rule for protecting the copyright, and
“SCMS (Serial Copy Management System)” has been established as a result.
To protect the copyright, the SCMS allows only first-generation digital copies to be made from premastered software (like CDs
or prerecorded MDs).
TOC (Table of Contents)
TOC is a kind of disc information containing sub-data (track number, playing time, etc.) that enables us to search for tracks
quickly on the disc.
To write the TOC on a CD-R or CD-RW, you need to finalize the disc.
Glossary
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4:15
6:05
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37-45.XL-R5020BK_f 02.5.28, 11:34 AM42