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FM radio multi-channel digital modulation system

A technology of FM broadcasting and digital modulation, applied in the direction of broadcasting circuit devices, transmission systems, electrical components, etc., can solve problems such as distortion, and achieve the effects of small sound distortion, cost reduction, and high-efficiency coverage

Active Publication Date: 2017-10-03
JILIN INST OF RADIO & TELEVISION SCI & TECHCAL INFORMATION CENT JILIN BUREAU OF PRESS PUBLICATION RADIO FILM & TELEVISION
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AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that every set of broadcast programs in the existing FM broadcast needs to correspond to a set of transmitting equipment, and the programs modulated by the exciter also need a digital-to-analog conversion circuit, and more distortions will occur during the conversion and modulation process. Problem, provide a kind of FM broadcast multi-channel digital modulation system

Method used

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  • FM radio multi-channel digital modulation system
  • FM radio multi-channel digital modulation system
  • FM radio multi-channel digital modulation system

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specific Embodiment approach 1

[0013] Specific implementation mode 1. Combination Figure 1 to Figure 3 In this embodiment, the multi-channel digital modulation system for FM broadcasting includes a data input interface circuit 1, a demultiplexing circuit 2, a digital decompression circuit 3, a digital FM circuit 4, an addition circuit 5, a frequency shift circuit 6, and a sideband filter circuit 7. Power amplifier circuit 8 and antenna 9;

[0014] The digital transfer of broadcast programs usually adopts several methods such as wired coaxial cable, optical fiber, microwave, satellite and network. The corresponding data interface circuit 1 can obtain the digital program transfer stream, which contains multiple program data streams and related information. program information. Each program data packet can be identified by using the program information through the demultiplexing circuit 2, and one or more designated program data streams can be obtained by separating the identification codes of the data packe...

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Abstract

The invention provides an FM radio multi-channel digital modulation system, relating to the technical field of radio and television. Each set of radio program of an existing FM radio is corresponding to one set of transmitting equipment, programs modulated by an exciter need a digital to analog conversion circuit, and more problems like distortion arise in conversion and modulation. The invention solves the above problem by using a technology of modulating twice and adopts a method of modulating and transmitting multiple sets of FM radio program simultaneously by using one set of circuit device. A data input interface circuit acquires a radio program transport stream from a digital signal source, the radio program transport stream is demultiplexed to obtain designated forwarded program data streams, digital decompression is performed on the designated forwarded program data streams, then a digital frequency modulation circuit and an adder circuit modulate the several sets of program to one medium frequency band, medium frequency signals of the programs are migrated to an FM radio frequency band by one single sideband modulation circuit, the medium frequency signals are amplified by one power amplification circuit, then all programs can be sent out by one antenna, thereby realizing efficient FM radio program coverage.

Description

technical field [0001] The invention relates to the technical field of broadcasting and television, in particular to a method for modulating a circuit in a broadcasting transmitter. Using the method, a small multi-channel FM broadcasting transmitter can be designed. Background technique [0002] Pocket radios are easy to carry, and listening to wireless broadcasts does not affect the work at hand. The sound quality of FM radio programs is good, and is very popular among users. Because FM broadcasting uses meter-band modulation and transmission, and high-frequency radio waves propagate at a line-of-sight, the coverage area is small. There are many coverage blind spots in remote areas. In order to solve the problem of broadcast coverage in these areas, it is necessary to build many program transmitting sites and install many transmitters. [0003] The radio program signal received by the radio is transmitted by the antenna of the transmitter. The baseband signal of the soun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04H20/44H04B1/04
CPCH04B1/04H04B1/0475H04B2001/0408H04B2001/0491H04H20/44
Inventor 焦杰李卫国赵虢睿
Owner JILIN INST OF RADIO & TELEVISION SCI & TECHCAL INFORMATION CENT JILIN BUREAU OF PRESS PUBLICATION RADIO FILM & TELEVISION
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