Yamaha MD4S Owner's Manual - Page 110
SCMS Serial Copy Management System, Signal to Noise Ratio S/N, Tempo Map, Tracking, Unity Gain - multi track md recorder
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110 Appendix SCMS (Serial Copy Management System)-A protection system intended to prevent illegal copying of music. SCMS allows one-time serial copying of copy-protected material. If the source is not copy protected, it's possible to make any number of digital-to-digital copies of the material. If the source is copy protected, however, it's possible to make a first-generation copy, but further copies cannot be made from the first-generation copy. SCMS is only effective when copying via digital connections. Recordings made via analog connections are not affected. Signal to Noise Ratio (S/N)-In an audio system, the difference between the nominal signal level and the residual noise floor, usually expressed as a ratio in decibels. It's used as a measure of an audio system's noise performance. Tempo Map-A map containing the tempo and meter information for a song. TOC-An acronym for Table Of Contents. An area of the MD DATA disc used to store information about what is recorded on the disc, the disc title, song titles, and so on. Tracking-A "track" is an area used to record and playback an individual audio signal. The MD4S has four tracks, each of which can be recorded/played independently. Recorders like the MD4S which have multiple tracks are called "multi-track recorders" (MTR). Unity Gain-A gain of one. That is, the signal is output from a circuit at the same level at which it entered. Once passed the MIC/LINE amplifier, a unity gain system minimizes signal noise and distortion. The unity gain position for the MD4S faders is at the 7-8 mark. -Owner's Manual