CN114205028A - Frequency self-adaptive FM-CDR emergency broadcast message receiving method - Google Patents

Abstract

The invention relates to a frequency self-adaptive FM-CDR emergency broadcast message receiving method, which comprises a CDR tuning demodulation module and a main control module, wherein FM-CDR signals are circularly received according to the frequency in a receiving frequency array Fn, an emergency broadcast index table in CDR transmission stream data is detected, the receiving frequency is changed when the time is out, and when the index table is obtained by analysis and an information target area in the index table is matched with a local machine, the frequency in the frequency array Fn is increased for receiving. The invention realizes the judgment and the reception of the FM-CDR emergency broadcast message sent to the local, dynamically increases the detection times of the FM-CDR frequency of the received FM-CDR emergency broadcast message in one inspection process, and improves the efficiency of receiving the FM-CDR emergency broadcast message.

Description

Frequency self-adaptive FM-CDR emergency broadcast message receiving method

Technical Field

The invention belongs to the technical field of emergency broadcasting, and particularly relates to a frequency self-adaptive FM-CDR emergency broadcast message receiving method.

Background

The emergency broadcast system consists of an emergency broadcast platform, an adapter, a transmission coverage system and an emergency broadcast terminal, wherein the emergency broadcast platform transmits emergency broadcast messages to the emergency broadcast terminal for playing through the adapter and the transmission coverage system. The emergency broadcast message includes an emergency broadcast instruction and emergency broadcast content. Emergency broadcast content is message incidental content (text, audio-video) or parameters specifying a broadcast television program.

When a sudden disaster is faced, the government can timely convey politics, release authority information, guide social public opinion and actively assist in disaster relief by using the emergency broadcasting system. The emergency broadcast can reach the emergency broadcast terminal singly or in a relay mode through a plurality of transmission coverage networks. Current broadcast television transmission coverage includes digital frequency modulation (FM-CDR). The national specification for FM-CDR includes "part 1 of FM-band digital audio broadcasting: digital broadcast channel frame structure, channel coding and modulation, part 2 of fm band digital audio broadcasting: multiplexing ], and the like.

The FM-CDR emergency broadcast message is an emergency broadcast message sent by an FM-CDR transmission and transmission system. How to receive FM-CDR emergency broadcast messages by emergency broadcast terminals and adapters is a technical problem to be solved.

Disclosure of Invention

The technical problem to be solved by the invention is how to receive FM-CDR emergency broadcast messages and transmit the emergency broadcast messages from an FM-CDR transmission coverage system to an emergency broadcast terminal and an adapter.

The technical scheme of the invention is as follows.

A frequency-adaptive FM-CDR emergency broadcast message receiving method, wherein N FM-CDR frequencies are possible to receive FM-CDR emergency broadcast messages, and the FM-CDR emergency broadcast messages are in a CDR data packet with PID = = PID _ sel, is characterized in that a frequency array F [ N ] comprises the N FM-CDR frequency values, and FM-CDR signals of all frequencies in the F [ N ] are circularly detected, wherein a processing process comprises the following steps, the current detected frequency is known as a frequency F [ i ], and the detection time is T:

step 1, a main control module sets the receiving frequency of a CDR tuning demodulation module as a current detection frequency;

step 2, the CDR tuning demodulation module performs tuning demodulation on the FM-CDR signal according to the receiving frequency to obtain a CDR transport stream;

step 3, filtering out a data packet corresponding to the emergency broadcast message in the CDR transport stream according to PID = = PID _ sel;

step 4, in time period T, the main control module retrieves and extracts the emergency broadcast index table from the data packet, if overtime, the detection of the receiving frequency is ended, and step 7 is executed;

step 5, if the message target area in the emergency broadcast index table is matched with the local machine, updating the frequency array Fn, increasing the frequency of the frequency F [ i ] in the frequency array Fn, namely increasing the detection frequency of the frequency F [ i ] in one inspection process, and executing step 6, otherwise executing step 7;

step 6, the main control module extracts an emergency broadcast index table and an emergency broadcast content table from the data packet to further obtain CDR emergency broadcast messages;

and 7, the main control module changes the current detection frequency to be F [ j ], wherein j = i +1, and j =0 if j = = array length.

Preferably, the core of the CDR tuning demodulation module is a heler Hi5216 chip.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the frequency in the receiving frequency array F [ n ], the FM-CDR signals are circularly received, CDR transmission stream data are detected, and when an emergency broadcast index table is obtained through analysis and a message target area in the emergency broadcast index table is matched with the local machine, the FM-CDR emergency broadcast messages sent to the local machine are judged. This enables how to find FM-CDR emergency broadcast messages addressed to the local machine in at least 1 frequency.

2. The CDR tuning demodulation module and the main control module are used for detecting and receiving FM-CDR emergency broadcast messages.

3. And updating the frequency array F [ n ] for the frequency F of the detected FM-CDR emergency broadcast message, and increasing the times of the frequency F in the frequency array F [ n ], namely increasing the detection times of the frequency F in one polling process. This improves the efficiency of receiving FM-CDR emergency broadcast messages.

Drawings

Fig. 1 is a block diagram of the structure of the embodiment of the present invention.

FIG. 2 is a flowchart of a method of a process according to an embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings and examples.

As shown in fig. 1-fig. 2, a frequency adaptive FM-CDR emergency broadcast message receiving method, where N FM-CDR frequencies are possible to receive FM-CDR emergency broadcast messages, and the FM-CDR emergency broadcast messages are in a CDR packet with PID = = PID _ sel, is characterized in that the N FM-CDR frequency values are included in a frequency array F [ N ], and FM-CDR signals of all frequencies in the F [ N ] are cyclically detected, wherein a processing procedure includes the following steps, and a current detected frequency is known as a frequency F [ i ], and a detection time is T:

step 1, a main control module sets the receiving frequency of a CDR tuning demodulation module as a current detection frequency;

step 2, the CDR tuning demodulation module performs tuning demodulation on the FM-CDR signal according to the receiving frequency to obtain a CDR transport stream;

step 3, filtering out a data packet corresponding to the emergency broadcast message in the CDR transport stream according to PID = = PID _ sel;

step 4, in time period T, the main control module retrieves and extracts the emergency broadcast index table from the data packet, if overtime, the detection of the receiving frequency is ended, and step 7 is executed;

step 5, if the message target area in the emergency broadcast index table is matched with the local machine, updating the frequency array Fn, increasing the frequency of the frequency F [ i ] in the frequency array Fn, namely increasing the detection frequency of the frequency F [ i ] in one inspection process, and executing step 6, otherwise executing step 7;

step 6, the main control module extracts an emergency broadcast index table and an emergency broadcast content table from the data packet to further obtain CDR emergency broadcast messages;

and 7, the main control module changes the current detection frequency to be F [ j ], wherein j = i +1, and j =0 if j = = array length.

Preferably, the core of the CDR tuning demodulation module is a heler Hi5216 chip.

The beneficial effects are that:

1. according to the frequency in the receiving frequency array F [ n ], the FM-CDR signals are circularly received, CDR transmission stream data are detected, and when an emergency broadcast index table is obtained through analysis and a message target area in the emergency broadcast index table is matched with the local machine, the FM-CDR emergency broadcast messages sent to the local machine are judged. This enables how to find FM-CDR emergency broadcast messages addressed to the local machine in at least 1 frequency.

2. The CDR tuning demodulation module and the main control module are used for detecting and receiving FM-CDR emergency broadcast messages.

3. And updating the frequency array F [ n ] for the frequency F of the detected FM-CDR emergency broadcast message, and increasing the times of the frequency F in the frequency array F [ n ], namely increasing the detection times of the frequency F in one polling process. This improves the efficiency of receiving FM-CDR emergency broadcast messages.

The present invention has been described in terms of embodiments, and it will be appreciated that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

Claims (2)

1. A frequency-adaptive FM-CDR emergency broadcast message receiving method, wherein N FM-CDR frequencies are possible to receive FM-CDR emergency broadcast messages, and the FM-CDR emergency broadcast messages are in a CDR data packet with PID = = PID _ sel, is characterized in that a frequency array F [ N ] comprises the N FM-CDR frequency values, and FM-CDR signals of all frequencies in the F [ N ] are circularly detected, wherein a processing process comprises the following steps, the current detected frequency is known as a frequency F [ i ], and the detection time is T:

step 1, a main control module sets the receiving frequency of a CDR tuning demodulation module as a current detection frequency;

step 2, the CDR tuning demodulation module performs tuning demodulation on the FM-CDR signal according to the receiving frequency to obtain a CDR transport stream;

step 3, filtering out a data packet corresponding to the emergency broadcast message in the CDR transport stream according to PID = = PID _ sel;

step 4, in time period T, the main control module retrieves and extracts the emergency broadcast index table from the data packet, if overtime, the detection of the receiving frequency is ended, and step 7 is executed;

step 5, if the message target area in the emergency broadcast index table is matched with the local machine, updating the frequency array Fn, increasing the frequency of the frequency F [ i ] in the frequency array Fn, namely increasing the detection frequency of the frequency F [ i ] in one inspection process, and executing step 6, otherwise executing step 7;

step 6, the main control module extracts an emergency broadcast index table and an emergency broadcast content table from the data packet to further obtain CDR emergency broadcast messages;

and 7, the main control module changes the current detection frequency to be F [ j ], wherein j = i +1, and j =0 if j = = array length.

2. The frequency adaptive FM-CDR emergency broadcast message receiving method of claim 1, wherein the core of the CDR tuning demodulation module is a hail Hi5216 chip.

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