Method, system and device for realizing China mobile multi-media broadcasting technology

Abstract

The invention provides a method, a system and a device for realizing the China mobile multi-media broadcasting technology. The method comprises the following steps that: each edge multiplexer in a single frequency network receives multiplexing code streams, which are outputted by a central multiplexer to multiplex local programs, per second and sends the multiplexing code streams per second multiplexing the local programs to corresponding modulators, wherein date time (TOD) messages carried in the multiplexing code streams per second and audio / video frame data of homologous programs remain unchanged before and after the local programs are multiplexed; each modulator performs delayed modulation on the received multiplexing code streams per second according to the preset and uniform launch delay of the single frequency network and sends the modulated multiplexing code streams to corresponding radio launchers; and each radio launcher launches the received multiplexing code streams per second. By adopting the technical scheme of the invention, the synchronous broadcasting of the homologous programs within a signal cross-coverage area in the single frequency network can be realized.

Description

technical field [0001] The present invention relates to mobile multimedia broadcasting (CMMB, China Mobile Multimedia Broadcasting) technology, in particular to a method, system and device for realizing CMMB technology. Background technique [0002] CMMB is a mobile TV technology independently developed by my country. According to the basic principles of "integration of space and ground, combination of satellite and network, unified standards, and nationwide roaming", a mobile multimedia broadcasting network covering the whole country and a unified operating mechanism are established. Network to mobile phones, personal digital assistants (PDA, Personal Digital Assistant), dynamic image expert compression standard audio layer 3 (MP3, MPEG AudioLayer-3), MP4, digital cameras, notebook computers and small receiving terminals on vehicles and ships, etc. Provides broadcast television programs. [0003] As of February 24, 2010, 301 cities across the country have opened CMMB signals...

AI Technical Summary

Problems solved by technology

[0006] According to the above introduction, if each district and county wants to add local programs, then after multiplexing the central program, provincial program and city program (the program of the superior city to which each district and county belongs), it is necessary to further multiplex the local program, and then output it to the modulator Then it is transmitted by the radio transmitting station, and there will be different transmission delays when the central program, provincial program and city program are transmitted to various districts and counties, and the multiplexers of different manufacturers have different implementation methods for multiplexing, that is, there are Multiplex delay, which will cause multiple radio transmitting stations in the single frequency network to be unable to broadcast the same-source program synchronously. The same-source program mentioned here refers to the same program, such as in both places A and B. If program C can be received, then program C is a homologous program relative to site A and site B. In this way, although there will be no impact on non-crossing areas where signals from multiple radio transmitting stations can cover, , for the intersection area where multiple radio transmitter signals can cover, since the same-source program cannot be broadcast synchronously, multiple signals will interfere with each other, resulting in the receiving terminal not being able to receive and play the program normally

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