 which modulates a carrier. Modulators are found as components in broadcasting transmitters and in satellite transponders. Modulators are also used by CATV companies to place a baseband video television signal onto a desired VHF or UHF channel. Home video tape recorders also have built-in modulators which enable the recorded video information to be played back using a television receiver tuned to VHF channel 3 or 4.Motion Compensation
The use of motion vectors to improve the efficiency of the prediction of pel values. The prediction uses motion vectors to provide offsets into the past and or future reference pictures containing previously decoded pel values that are used to form the prediction error signal.
The process of estimating motion vectors during the encoder process.
A two-dimensional vector used for motion compensation that provides an offset from the coordinate position in the current picture to the coordinates in a reference picture.
MPEG - Motion Picture Experts Group
A proposed International Standards organization (ISO) standard for digital video and audio compression for moving images.MPEG-1
1/4 broadcast quality which translates to 352 x 240 pixels. Typically compressed at 1.5 Mbs.
Similar to MPEG-1, but includes extensions to cover a wider range of applications. MPEG-2 translates to 704 x 480 pixels at 30 frames per second in North America and 704 x 576 fps at 25 fps in Europe. Typically compressed at higher than 5 Mbs. The primary application targeted during the MPEG-2 definition process was the all-digital transmission of broadcast TV quality video.
MPS - Master Program SchedulerMultiplex
The output signal from an encoder that is divided into two phases. One half is called the I multiplex, and the other is called the Q multiplex. UCS channels 0 through 4 are transmitted in the I multiplex and channels 5 through 9 are transmitted in the Q multiplex. Each multiplex contains control channel messages (messages addressed to the decoders originating from the encoder and the UCS), as well as video, audio, and data information.
A special form of broadcast where copies of the packet are delivered to only a subset of all possible destinations.Multiplexing
A means of transmitting two or more signals over a single wire or carrier wave.
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