Method and device for building CMMB (China Mobile Multimedia Broadcasting) antenna in handheld terminal

Abstract

The invention provides a method and device for building a CMMB (China Mobile Multimedia Broadcasting) antenna in a handheld terminal. The method comprises the steps: a frequency band range of a CMMB applicable wave band is at least divided into a first frequency band and a second frequency band; a first radio frequency signal which is output from a built-in antenna and falls in the first frequency band is transmitted to a CMMB chip through a first radio frequency branch; a second radio frequency signal which is output from the built-in antenna and falls in the second frequency band is transmitted to the CMMB chip through a second radio frequency branch; and the CMMB chip judges signal quality indexes of the first radio frequency signal output from the first radio frequency branch and the second radio frequency signal output from the second radio frequency branch, selects one radio frequency signal with a signal quality index meeting the anticipation from the first radio frequency signal and the second radio frequency signal, and discards the other radio frequency signal.

Description

technical field [0001] The invention relates to a method and a device for a terminal with a built-in CMMB antenna, and is especially suitable for a method and a device for a built-in antenna for improving the CMMB receiving effect of a handheld terminal. Background technique [0002] The full name of CMMB is China Mobile Multimedia Broadcasting, namely: China Mobile Multimedia Broadcasting. CMMB is mainly oriented to small-screen handheld terminal devices. Its terminal products mainly include MP4, mobile phones, GPS, USB receiver sticks, independent receivers, etc., providing digital broadcasting and TV programs, comprehensive information and emergency broadcasting services, and realizing satellite transmission and terrestrial network Combined for seamless synergistic coverage. CMMB adopts mobile multimedia broadcasting and television technology with independent intellectual property rights. The system is operable, maintainable and manageable. It has broadcast and two-way s...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to solve the problems that the existing handheld devices are not easy to miniaturize the built-in CMMB antenna, the receiving sensitivity is low, and the CMMB playback search ability is poor. Connect two or more radio frequency branches, and then the CMMB chip selects the signal received by the radio frequency branch to improve the sensitivity of the received signal, reduce the space requirements of the CMMB built-in antenna, and improve the TV reception effect of the CMMB handheld device

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