- .3.1.
, , , .
(, ) . , DRM.
DRM . .
.3.1. -
DRM MPEG-4 Audio ( ISO/IEC 14496-3, ISO/IEC 14496-3/Amd1): MPEG-4 AAC, MPEG-4 CELP MPEG-4 HVXC.
MPEG-4 AAC (Advanced Audio Coding ) ().
DRM Spectral Band Replication (SBR ).
SBR 2 . , .
MPEG-4 CELP (Code Excited Linear Prediction ) MPEG-4 HVXC (Harmonic Vector eXitation Coding ) ().
, , DRM 2 72 /. 2 / , , 72 /, .
DRM :
Main Service Channel (MSC );
Fast Access Channel (FAC );
Service Description Channel (SDC ).
MSC MUX. , , .
. , .
MUX . MSC .
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, , QAM-, (QAM Quadrature Amplitude Modulation).
QAM- MSC , (, DRM, , ).
FAC , DRM, , MSC, .
SDC MSC, , , , , , .
QAM- FAC SDC . , , DRM. , , FAC SDC, .
OFDM (OFDM Orthogonal Frequency Division Multiplexing ) - .
OFDM , . OFDM- , .
OFDM- . - , , - . DRM- .
DRM .
,