Abstract:
The method involves receiving a package of a flow of coded video stream coming from a video coder through an interface screen. A transport interface is reconfigured, and a signal is transmitted through a broadcasting network. The flow package is stored in a database (412), where the flow package has a reference value for a program clock. A frame of a transport interface is provided in a queue. A research is performed in the queue corresponding to a request from a user who carries out an access through a communication network. The package is transmitted through the communication network. An independent claim is also included for a device for providing a video service.
Abstract:
An apparatus for transmitting digital multimedia broadcasting includes: a base layer processor that outputs a base layer stream; an enhancement layer processor that outputs an enhancement layer stream; and a transmitter that modulates the enhancement layer stream based on one of a first and second hierarchical modulation modes using different modulation schemes and maps a symbol of the modulated enhancement layer stream based on a symbol position of the base layer stream to generate a transmission frame.
Abstract:
PURPOSE: An error-correction code method using layer modulation and an apparatus thereof are provided to enable variable control of error-correction code rate using layer modulation. CONSTITUTION: An interface unit(310) is input with transmitted-data. The first forward error correction encoder(320) produces first parity bits for forward error correction of the transmitted data by the application of first forward error correction code. A second forward error correction encoder(330) produces second parity bits by applying second forward error correction codes on the transmitted data or the first parity bits. A layer modulator(340) modulates the transmitted-data and the first parity bits into an HP stream. The layer modulator modulates the second parity bits into an LP(Low Priority) stream.