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Amplitude modulation band digital audio broadcasting signal generation method and system

A technology for digital audio broadcasting and signal generation, which is applied in the field of digital information transmission and can solve the problems of poor reception signal quality and low audio quality of analog AM broadcasting

Inactive Publication Date: 2018-03-09
ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method and system for generating an AM frequency band digital audio broadcasting signal, which are used to solve the problems of poor reception signal quality and low audio quality of analog AM broadcasting

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  • Amplitude modulation band digital audio broadcasting signal generation method and system
  • Amplitude modulation band digital audio broadcasting signal generation method and system
  • Amplitude modulation band digital audio broadcasting signal generation method and system

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Embodiment Construction

[0082] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0083] In order to solve the problems of low frequency spectrum efficiency, poor audio quality and poor anti-interference ability of the current analog AM broadcasting, the invention provides a method for generating digital audio broadcasting signals in the AM frequency band. This method defines two bandwidth modes, which are 9kHz mode and 18kHz mode respectively, and Table 1 provides system parameters of the two bandwidth modes. Define the unit time T=1 / 48000...

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Abstract

The invention discloses an amplitude modulation band digital audio broadcasting signal generation method and system. The method comprises the following steps: performing channel coding, bit interleaving and constellation processing on main service information containing paths of service data, system information containing encoding modulation mode and frequency spectrum mode information, and service description information containing description and illustration of the service data, and performing OFDM modulation with disperse radio frequency; inserting the adjusted signal in a beacon, and generating a logic frame, performing frame allocation on the logic frame to generate a physical layer signal frame, and performing conversion from a base band to the radio frequency to generate an amplitude modulation band digital audio broadcasting signal. The system adopts the LDPC channel coding, and processes the signal through interleaving, logical frame allocation and so on, so that the anti-interference performance of the system can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a method and system for generating an AM frequency band digital audio broadcasting signal. Background technique [0002] The frequency range of my country's medium-wave broadcasting is 526.5kHz to 1606.5kHz, and the channel interval is 9kHz. From the nominal carrier frequency of 531kHz to 1602kHz, there are 120 channels in total. [0003] Medium-wave broadcasting is a transmission method that mainly uses the diffraction transmission of ground waves and is supplemented by ionospheric reflection transmission. Compared with FM radio, medium wave radio has a wider coverage area, and is a wireless transmission method that can achieve large-scale coverage more economically and effectively, and is suitable for listeners in rural areas and remote areas to listen to radio. Although MW AM broadcasting has problems such as narrow spectrum bandwidth, single sound qu...

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Application Information

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IPC IPC(8): H04L1/00H04L5/00H04L27/26H04L27/34H04L27/38
CPCH04L1/0059H04L1/0063H04L1/0071H04L5/0008H04L27/2678H04L27/3483H04L27/3854
Inventor 李锦文盛国芳吴智勇高鹏王晓光裴育杰
Owner ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION
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