Method for adding associated audio frequency signaling to frequency modulation synchronized broadcast
A synchronous broadcasting and audio technology, which is applied in broadcasting information switching/replacing, broadcasting device, broadcasting transmission system, etc., can solve the problem of not affecting the audio signal quality of FM synchronous broadcasting system, etc., and achieve the effect of wide applicability
Inactive Publication Date: 2011-03-23
苏州威士达信息科技有限公司
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007]However, the process of adding, separating and synchronizing the channel-associated audio time-marking signal has always been a difficult problem to solve, neither can affect the audio signal transmitted by the FM synchronous broadcasting system quality, but also to ensure that the system can be accurately synchronized
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0043] In the FM synchronous broadcasting of the present invention, the 1PPS second pulse signal provided by GPS is used as the time scale signal, which is multiplexed with the audio stream and transmitted in the channel. as attached figure 2 As shown, at the sending end, the audio front-end server adds the second pulse signal provided by the GPS into the audio stream as channel-associated audio signaling. At the receiving end, the exciter extracts the associated audio signaling, and compares the time scale signal with the local GPS second pulse to obtain the audio delay caused by the transmission process. In addition, the downlink management information of the network can also be included in the channel-associated audio signaling, so that the remote control of each exciter can be realized, wh...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for solving the problem of synchronized audio frequency time-delay calculation and adjustment in a frequency modulation synchronized broadcast system, which is characterized in that an audio frequency front-end server of the system executes the following steps of: communicating with a human-machine interface module to obtain the user data in an application layer ofthe digital frequency modulation synchronized broadcast system; selecting the data frame type to be sent by a polling method, sending a synchronization frame and a non-synchronization frame alternately, only sending one synchronization frame per second; data framing from the application layer to a data link layer; carrying out FSK modulation on the data in the data link layer; receiving digital audio frequency signal from an audio frequency input end and then adding the FSK waveform modulated by the associated audio frequency signaling after low-pass filtering; carrying out CODEC D / A conversion; and outputting the signal to a post device through a digital or an analog audio interface.
Description
technical field [0001] The invention relates to FM synchronous broadcasting system technology, in particular to a system and method for solving the audio delay adjustment problem of digital FM synchronous broadcasting system. Background technique [0002] FM simulcasting refers to a form of broadcasting in which two or more transmitters located at different locations use the same frequency to broadcast the same program content. The establishment of the FM synchronous broadcasting network can well solve the problem of using a single frequency for large-scale FM broadcasting. [0003] The advantages of FM synchronous broadcasting are manifested in the following two aspects. First of all, because FM synchronous broadcasting adopts the coverage method of low-power on-demand distribution, it can reduce electromagnetic pollution and save operating costs for the station. At the same time, its single-frequency coverage, compared with the traditional FM radio coverage method, not o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04H20/10H04H40/27H04H20/67
Inventor 杨刚杨霏刘晋蔡超时
Owner 苏州威士达信息科技有限公司