CN102594475B - Amplitude modulation medium-wave emergency broadcasting message interpolation device and method - Google Patents

Abstract

The invention discloses an amplitude modulation medium-wave emergency broadcasting message interpolation device and an amplitude modulation medium-wave emergency broadcasting message interpolation method. The method comprises the steps of: keeping time delay with third preset time length for an input broadcasting program audio signal; conducting gap detection to the input program audio signal, and when a program gap or a statement gap which is longer than first preset time length is detected in a broadcasting program, generating a dual-tone multiple-frequency emergency broadcasting signal which lasts for second preset time length and broadcasting the signal according to preset frequency; and interpolating the dual-tone multiple-frequency emergency broadcasting signal in the program gap or the statement gap which is longer than the first preset time length, mixing the dual-tone multiple-frequency emergency broadcasting signal with the program audio signal with the third preset time length and outputting the signals. By interpolating the dual-tone multiple-frequency encoded emergency broadcasting signal in the program gap or the statement gap of the broadcasting program audio signal, users can receive the emergency broadcasting message in time.

Description

Device and method for inserting AM/MW emergency broadcast information

technical field

The invention relates to the technical field of broadcast communication, in particular to an inserting device and method for AM MW emergency broadcast information.

Background technique

In some cases, the receiving terminal needs to be able to immediately receive the emergency broadcast information sent by the network and present it to the user, for example:

Warning information, such as: earthquake information, fire information, flood information, typhoon information, etc.

User-related information: such as arrears information, reminder fee information, stored-value card recharge success information, etc.

System-related information: such as the update information of the electronic business guide, etc.

This information is closely related to the user's own interests, and the sooner the user receives it, the better. However, in general, users do not always receive emergency broadcast programs. They may not switch on in time to receive emergency broadcast messages while listening to other radio programs or without knowing it.

Therefore, if the previous receiving terminal is used, in many cases, the user cannot receive the emergency broadcast information in time, which will cause the user to be unable to obtain the information immediately and respond quickly.

Contents of the invention

In view of the above analysis, the present invention aims to provide a device and method for inserting AM/MW emergency broadcast information to solve the problem in the prior art that users cannot receive emergency broadcast information in time.

The purpose of the present invention is mainly achieved through the following technical solutions:

The present invention provides an insertion device for AM MW emergency broadcast information, comprising: a program gap detection module, a delay circuit module, a dual-tone multi-frequency encoding module and a signaling broadcast control module, wherein,

The program gap detection module is used to perform gap detection on the input program audio signal, and when a program gap period or sentence gap greater than the first predetermined time length is detected in the broadcast program, control the dual-tone multi-frequency The encoding module generates dual-tone multi-frequency emergency broadcast signaling that lasts for a second predetermined length of time;

The delay circuit module is used to maintain a time delay of a third predetermined length of time for the input broadcast program audio signal;

The signaling distribution control module is used to control the dual-tone multi-frequency encoding module to broadcast dual-tone multi-frequency emergency broadcast signaling at a predetermined frequency;

The dual-tone multi-frequency encoding module is used to generate dual-tone multi-frequency emergency broadcast signaling lasting for a second predetermined length of time under the control of the program gap detection module and under the control of the signaling broadcast control module Broadcast according to a predetermined frequency, insert the dual-tone multi-frequency emergency broadcast signaling in the program gap period longer than the first predetermined time length or in the sentence gap, and mix it with the program audio signal that has been delayed for the third predetermined time length After output.

Further, the device also includes:

An error correction code module, configured to perform error correction code protection on the inserted DTMF emergency broadcast signaling.

The present invention also provides a method for inserting AM/MW emergency broadcast information, including:

Step A: maintaining a time delay of a third predetermined length of time for the input broadcast program audio signal;

Step B: Perform gap detection on the input program audio signal, and when a program gap period or sentence gap greater than the first predetermined time length is detected in the broadcast program, a dual-tone multi-frequency emergency broadcast that lasts for the second predetermined time length is generated Signaling and broadcast according to the predetermined frequency;

Step C: inserting the dual-tone multi-frequency emergency broadcast signaling in the program gap period longer than the first predetermined time length or in the sentence gap, mixing it with the program audio signal delayed by the third predetermined time length, and outputting it.

Further, before inserting the DTMF emergency broadcast signaling, it also includes:

Perform error correction coding protection on the DTMF emergency broadcast signaling.

Wherein, the second predetermined time length is determined according to the duration of the DTMF signal specified by the CCITT, and the value range is 40 milliseconds to 50 milliseconds; the first predetermined time length and the third predetermined time length need to be Determined according to the second predetermined time length.

The beneficial effects of the present invention are as follows:

The present invention inserts dual-tone multi-frequency coded emergency broadcast signaling into the program gap period or sentence gap of the broadcast program audio signal, so that the user can receive the emergency broadcast information in time; at the same time, the DTMF emergency broadcast signal can be The selected error correction code protection can further improve the anti-interference ability of signaling.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

Fig. 1 is the structural representation of the device described in the embodiment of the present invention;

Fig. 2 is a schematic flow chart of the method described in the embodiment of the present invention.

Detailed ways

Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention. For the sake of clarity and simplicity, detailed descriptions of known functions and constructions in the devices described herein will be omitted when it may obscure the subject matter of the present invention.

Firstly, the device described in the embodiment of the present invention will be described in detail with reference to FIG. 1 .

As shown in Figure 1, Figure 1 is a schematic structural diagram of the device described in the embodiment of the present invention, which specifically may include: a delay circuit module, a program gap detection module, a DTMF (Double Tone Multi Frequency, dual-tone multi-frequency) encoding module, a correcting An error code module and a signaling broadcast control module, wherein,

The program gap detection module is used to detect the gap of the input program audio signal. When the program gap period or the sentence gap greater than the first predetermined time length (set to 50 milliseconds in the embodiment of the present invention) is detected in the broadcast program, And control DTMF encoding module in good time to produce DTMF emergency broadcast signaling, the duration is the second predetermined time length (setting as 40 milliseconds in the embodiment of the present invention);

The delay circuit module maintains a time delay of a third predetermined length of time (set to 45 milliseconds in the embodiment of the present invention) to the input program audio signal;

The signaling broadcast control module controls the DTMF encoding module to broadcast emergency broadcast signaling lasting 40 milliseconds at a predetermined frequency (once every 5 seconds);

The DTMF encoding module generates DTMF emergency broadcast signaling lasting 40 milliseconds under the control of the program gap detection module and broadcasts it at a predetermined frequency under the control of the signaling broadcast control module. The DTMF emergency broadcast signaling is inserted into the gap of the DTMF, mixed with the program audio signal delayed by 45 milliseconds, and output.

The error correction code module, as an optional functional module, can further enhance the transmission reliability of the DTMF emergency broadcast signaling.

Next, the method described in the embodiment of the present invention will be described in detail with reference to FIG. 2 .

As shown in Figure 2, Figure 2 is a schematic flow chart of the method described in the embodiment of the present invention, which may specifically include the following steps:

Step 201: The delay circuit module maintains a time delay of 45 milliseconds for the input program audio signal;

Step 202: Simultaneously with step 201, the program gap detection module performs gap detection on the input program audio signal, and when a gap period and a sentence gap of not less than 50 milliseconds in the broadcast program are detected, step 203 is executed;

Step 203: the program gap detection module controls the DTMF encoding module to generate DTMF emergency broadcast signaling, the signaling duration is 40 milliseconds, and the broadcast frequency is controlled by the signaling broadcast control module (the frequency of signaling broadcast can be controlled at an average of 5 1 second);

Step 204: Insert DTMF emergency broadcast signaling into the program gap or sentence gap greater than 50 milliseconds, and mix it with the program audio signal that has been delayed by 45 milliseconds;

Step 205: Perform optional error correction code encoding protection on the inserted DTMF emergency broadcast signaling;

Step 206: Output the audio signal inserted with the DTMF emergency broadcast signaling.

It should be noted that the 40 milliseconds mentioned in the above technical solution is the minimum duration of the DTMF signal according to the CCITT (Consultative Committee for International Telegraph and Telephone) regulation, and the embodiment of the present invention is not limited to 40 milliseconds, generally it can be within 40 milliseconds. Select between milliseconds and 50 milliseconds; the time delay of 45 milliseconds is determined according to the duration of the DTMF signal of 40 milliseconds, and the extra 5 milliseconds is to have a time protection interval, and it is not limited to 5 milliseconds; not less than The gap period of 50 milliseconds and the gap between sentences are mainly determined according to the duration of the DTMF signal, and the specific length can be set according to actual needs.

To sum up, the embodiment of the present invention provides a device and method for inserting AM/MW emergency broadcast information, by inserting dual-tone multi-frequency coded emergency broadcast in the program gap period or sentence gap of the broadcast program audio signal Signaling enables users to receive emergency broadcast information in a timely manner; at the same time, optional error correction code protection for DTMF emergency broadcast signals can further improve the anti-interference ability of signaling.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (4)

1. An insertion device for AM MW emergency broadcast information, comprising: a program gap detection module, a delay circuit module, a dual-tone multi-frequency coding module and a signaling broadcast control module, wherein, The program gap detection module is used to perform gap detection on the input program audio signal, and when a program gap period or sentence gap greater than the first predetermined time length is detected in the broadcast program, control the dual-tone multi-frequency The encoding module generates dual-tone multi-frequency emergency broadcast signaling that lasts for a second predetermined length of time; The delay circuit module is used to maintain a time delay of a third predetermined length of time for the input broadcast program audio signal; The signaling distribution control module is used to control the dual-tone multi-frequency encoding module to broadcast dual-tone multi-frequency emergency broadcast signaling at a predetermined frequency; The dual-tone multi-frequency encoding module is used to generate dual-tone multi-frequency emergency broadcast signaling lasting for a second predetermined length of time under the control of the program gap detection module and under the control of the signaling broadcast control module Broadcast according to a predetermined frequency, insert the dual-tone multi-frequency emergency broadcast signaling in the program gap period longer than the first predetermined time length or in the sentence gap, and mix it with the program audio signal that has been delayed for the third predetermined time length post output; Wherein, the second predetermined time length is determined according to the duration of the specified DTMF signal, and the value range is 40 milliseconds to 50 milliseconds; the first predetermined time length and the third predetermined time length need to be determined according to A second predetermined length of time is determined. 2. The device according to claim 1, further comprising: An error correction code module, configured to perform error correction code protection on the inserted DTMF emergency broadcast signaling. 3. A method for inserting AM MW emergency broadcast information, characterized in that it comprises: Step A: maintaining a time delay of a third predetermined length of time for the input broadcast program audio signal; Step B: Perform gap detection on the input program audio signal, and when a program gap period or sentence gap greater than the first predetermined time length is detected in the broadcast program, a dual-tone multi-frequency emergency broadcast that lasts for the second predetermined time length is generated Signaling and broadcast according to the predetermined frequency; Step C: inserting the dual-tone multi-frequency emergency broadcast signaling in the program gap period longer than the first predetermined time length or in the sentence gap, and outputting after mixing with the program audio signal that has been delayed for the third predetermined time length; Wherein, the second predetermined time length is determined according to the duration of the specified DTMF signal, and the value range is 40 milliseconds to 50 milliseconds; the first predetermined time length and the third predetermined time length need to be determined according to A second predetermined length of time is determined. 4. The method according to claim 3, further comprising: before inserting the DTMF emergency broadcast signaling: Perform error correction coding protection on the DTMF emergency broadcast signaling.