CN114205042A - Time-adaptive dual-mode FM-CDR emergency broadcast message receiving method - Google Patents

Abstract

The invention relates to a time self-adaptive dual-mode FM-CDR emergency broadcast message receiving method, which comprises a first CDR tuning demodulation module, a detection module, a second 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, CDR transmission stream data is detected in a corresponding time period T [ i ], the receiving frequency is changed when the FM-CDR signals are overtime, and T [ i ] is set to be increased for receiving when an emergency broadcast index table is obtained through analysis and an information target area in the emergency broadcast index table is matched with a local machine. The invention realizes the judgment of whether the FM-CDR emergency broadcast message sent to the local machine exists or not and the reception of the FM-CDR emergency broadcast message, dynamically increases the detection time of the FM-CDR frequency of the received FM-CDR emergency broadcast message, and improves the efficiency of receiving the FM-CDR emergency broadcast message.

Description

Time-adaptive dual-mode FM-CDR emergency broadcast message receiving method

Technical Field

The invention belongs to the technical field of emergency broadcasting, and particularly relates to a time-adaptive dual-mode 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 time-adaptive dual-mode 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 the N FM-CDR frequency values are included in a frequency array F [ N ], the detection time value of each corresponding frequency in the F [ N ] is put in a time array T [ N ], and FM-CDR signals of all frequencies in the F [ N ] are circularly detected, wherein one detection process comprises the following steps, and the current detection frequency is known as a frequency F [ i ]:

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

step 2, the first 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 [ i ], the detection 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 6 is executed;

step 5, if the message target area in the emergency broadcast index table is matched with the local machine, setting the T [ i ] value to increase, setting the current receiving frequency to be the frequency F [ i ], and executing a response process;

and 6, the detection module changes the current detection frequency to F [ j ], wherein j = i +1, and j =0 if j = = array length.

The one-time response process comprises the following steps:

step a, setting the receiving frequency of a second CDR tuning demodulation module as the current receiving frequency, and tuning and demodulating the FM-CDR signal by the second CDR tuning demodulation module according to the receiving frequency to obtain a CDR transport stream;

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

and c, the main control module extracts the emergency broadcast index table and the emergency broadcast content table from the data packet to further obtain the CDR emergency broadcast message.

Preferably, the core of the first CDR tuning demodulation module and the second CDR tuning demodulation module is a hail 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 FM-CDR emergency broadcast message is received by the first CDR tuning demodulation module, the detection module, the second CDR tuning demodulation module and the main control module.

3. The first CDR tuning demodulation module and the detection module detect whether the FM-CDR emergency broadcast message exists or not, the second CDR tuning demodulation module and the main control module receive the FM-CDR emergency broadcast message, and the FM-CDR tuning demodulation module and the main control module receive the FM-CDR emergency broadcast message simultaneously, so that the FM-CDR emergency broadcast message detection is uninterrupted and the receiving is not omitted.

4. In the inspection, for each receiving frequency, in the corresponding time period T [ i ], the detection module retrieves and extracts the emergency broadcast index table from the data packet, if the time is out, the receiving frequency is changed, if the message target area in the emergency broadcast index table is matched with the local machine, the frequency has FM-CDR emergency broadcast messages, the value of T [ i ] is set to increase, a response process is executed, and the next frequency is continuously inspected. The detection time of the FM-CDR frequency of the received FM-CDR emergency broadcast message is dynamically increased, and the efficiency of receiving the FM-CDR emergency broadcast message is improved.

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 detection process according to an embodiment of the present invention.

Fig. 3 is a flow chart of a method of a response procedure 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. 3, a time-adaptive dual-mode FM-CDR emergency broadcast message receiving method, where N FM-CDR frequencies are likely to receive an FM-CDR emergency broadcast message, and the FM-CDR emergency broadcast message is 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 ], a detection time value of each corresponding frequency in F [ N ] is placed in a time array T [ N ], and FM-CDR signals of all frequencies in F [ N ] are detected cyclically, wherein a detection process includes the following steps, and a current detection frequency is known as a frequency F [ i ]:

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

step 2, the first 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 [ i ], the detection 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 6 is executed;

step 5, if the message target area in the emergency broadcast index table is matched with the local machine, setting the T [ i ] value to increase, setting the current receiving frequency to be the frequency F [ i ], and executing a response process;

and 6, the detection module changes the current detection frequency to F [ j ], wherein j = i +1, and j =0 if j = = array length.

The one-time response process comprises the following steps:

step a, setting the receiving frequency of a second CDR tuning demodulation module as the current receiving frequency, and tuning and demodulating the FM-CDR signal by the second CDR tuning demodulation module according to the receiving frequency to obtain a CDR transport stream;

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

and c, the main control module extracts the emergency broadcast index table and the emergency broadcast content table from the data packet to further obtain the CDR emergency broadcast message.

Preferably, the core of the first CDR tuning demodulation module and the second CDR tuning demodulation module is a hail 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 FM-CDR emergency broadcast message is received by the first CDR tuning demodulation module, the detection module, the second CDR tuning demodulation module and the main control module.

3. The first CDR tuning demodulation module and the detection module detect whether the FM-CDR emergency broadcast message exists or not, the second CDR tuning demodulation module and the main control module receive the FM-CDR emergency broadcast message, and the FM-CDR tuning demodulation module and the main control module receive the FM-CDR emergency broadcast message simultaneously, so that the FM-CDR emergency broadcast message detection is uninterrupted and the receiving is not omitted.

4. In the inspection, for each receiving frequency, in the corresponding time period T [ i ], the detection module retrieves and extracts the emergency broadcast index table from the data packet, if the time is out, the receiving frequency is changed, if the message target area in the emergency broadcast index table is matched with the local machine, the frequency has FM-CDR emergency broadcast messages, the value of T [ i ] is set to increase, a response process is executed, and the next frequency is continuously inspected. The detection time of the FM-CDR frequency of the received FM-CDR emergency broadcast message is dynamically increased, and the efficiency of receiving the FM-CDR emergency broadcast message is improved.

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 time-adaptive dual-mode 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 the N FM-CDR frequency values are included in a frequency array F [ N ], the detection time value of each corresponding frequency in the F [ N ] is put in a time array T [ N ], and FM-CDR signals of all frequencies in the F [ N ] are circularly detected, wherein one detection process comprises the following steps, and the current detection frequency is known as a frequency F [ i ]:

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

step 2, the first 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 [ i ], the detection 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 6 is executed;

step 5, if the message target area in the emergency broadcast index table is matched with the local machine, setting the T [ i ] value to increase, setting the current receiving frequency to be the frequency F [ i ], and executing a response process;

step 6, the detection module changes the current detection frequency to F [ j ], wherein j = i +1, and j =0 if j = = array length;

the one-time response process comprises the following steps:

step a, setting the receiving frequency of a second CDR tuning demodulation module as the current receiving frequency, and tuning and demodulating the FM-CDR signal by the second CDR tuning demodulation module according to the receiving frequency to obtain a CDR transport stream;

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

and c, the main control module extracts the emergency broadcast index table and the emergency broadcast content table from the data packet to further obtain the CDR emergency broadcast message.

2. The time-adaptive dual-mode FM-CDR emergency broadcast message receiving method of claim 1, wherein the core of the first and second CDR tuning demodulation modules is a hail Hi5216 chip.

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