WO2012151992A1

WO2012151992A1 - Reception method and device for cmmb terminal

Info

Publication number: WO2012151992A1
Application number: PCT/CN2011/083966
Authority: WO
Inventors: 王磊; 张栋
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-22
Filing date: 2011-12-14
Publication date: 2012-11-15
Also published as: CN102892037A

Abstract

The present invention provides a reception method for a CMMB terminal, comprising: when a CMMB terminal plays normally, searching for a usable frequency; and when reception performance parameters of a frequency at which a program is played are poorer than reception performance parameters of the usable frequency, the CMMB terminal switching the frequency at which the program is played to the found usable frequency. The present invention also provides a reception device for a CMMB terminal. With the above solution, the function is implemented in a CMMB chip by software programming without adding addition hardware; and the CMMB terminal is enabled to operate at the frequency with the best reception performance, so as to realize optimal play.

Description

CMMB terminal receiving method and device

The present invention relates to the field of mobile communications, and in particular, to a CMMB (China Mobile Multimedia Broadcasting) terminal receiving method and apparatus. Background technique

CMMB is mainly for handheld terminal devices. Its terminal products mainly include MP4, mobile phones, GPS, USB receivers, independent receivers, etc., providing digital broadcast TV programs, integrated information and emergency broadcast services, and combining satellite transmission with terrestrial networks. Seamless collaborative coverage. CMMB adopts mobile multimedia broadcast TV technology, the system can be operated, maintainable and manageable, with broadcast and two-way service functions, supporting the combination of central and local operation systems, with encryption authorization control management system, supporting unified standards and unification. Operation, support users nationwide roaming.

The CMMB terrestrial base station U-band requires a frequency range of 474-798Mhz. Most cities that support CMMB have only one receiving frequency in this range. However, in developed cities such as Beijing and Shanghai, with the increasing popularity of CMMB handheld terminals, these cities have more than one CMMB receiving frequency, such as Beijing. There are currently three frequency points. For these cities with multiple frequencies, CMMB handheld terminal devices can only initially lock a frequency point with good signal strength for reception, but with regional switching, the signal strength of different regional frequency points will change. The frequency point is locked. The CMMB handheld terminal device can only play the original frequency point. If the frequency is weak in this area, the user may not play or play discontinuously at this time. This is The shortcomings of the current multi-frequency point CMMB do not fully exploit the advantages of the regional multi-frequency point CMMB. Summary of the invention

The technical problem to be solved by the present invention is to provide a CMMB terminal receiving method and device, which solves the problem that the frequency point switching cannot be automatically performed in the CMMB terminal.

To solve the above problem, the present invention provides a CMMB terminal receiving method, including: searching for an available frequency point when a CMMB terminal plays normally;

When the reception performance parameter of the broadcast program frequency point is worse than the received performance parameter of the searchable available frequency point, the CMMB terminal switches the frequency point of the broadcast program to the searched available frequency point.

Further, before searching for the available frequency point, the CMMB terminal determines whether to start searching for the available frequency point according to the signal performance parameter of the current playing frequency point.

Further, after searching for the available frequency points, the method further includes: comparing the reception performance parameter of the available frequency point with the reception performance parameter of the program frequency point that the CMMB terminal is playing.

Further, when the receiving performance parameter of the playing program frequency point is worse than the receiving performance parameter of the available frequency point, the method further includes

The user is provided with a handover prompt, and the frequency of the broadcast program is switched to the searched available frequency point according to the user's handover instruction.

Further, after searching for the available frequency points, the reception performance parameters of the available frequency points are saved.

In the above method, the CMMB terminal determines whether to start searching for available frequency points according to a signal performance parameter of a current playing frequency point,

If the signal performance parameter of the program frequency being played during a certain period of time does not exceed a certain working value, then it is decided to start searching for the available frequency point.

The present invention also provides a CMMB terminal receiving apparatus, including

a search module, configured to search for an available frequency point when the CMMB terminal is playing normally; and a control module, configured to receive, at the frequency of the broadcast program, a performance parameter that is worse than an available frequency point When receiving the performance parameter, the frequency point of the CMMB terminal playing the program is switched to the searched available frequency point.

Further, it also includes

The determining start module is configured to determine whether to start searching for the available frequency points of the CMMB terminal according to the signal performance parameter of the current playing frequency point.

Further, it also includes

And a comparison module, configured to compare the reception performance parameter of the available frequency point with the reception performance parameter of the program frequency point that the CMMB terminal is playing.

Further, it also includes

a prompting module, configured to provide a prompt for switching to the user;

The control module is configured to switch a frequency point of the broadcast program to the searched available frequency point according to a switching instruction of the user.

Further, it also includes

And a saving module, configured to save the receiving performance parameter of the available frequency point after searching for the available frequency point. By adopting the technical solution of the present invention, the function is mainly implemented by software programming inside the CMMB chip, and no additional hardware is needed; and the CMMB terminal can always work at the frequency of receiving the best performance to achieve optimal playback. DRAWINGS

Figure 1 is a block diagram of a CMMB terminal;

Figure 2 is a structural view of a first embodiment of the present invention;

Figure 3 is a flow chart of a second embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments in order to make the present invention. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1 , it is a CMMB terminal structure diagram, including a CMMB chip, where the CMMB chip includes a tuner, a control module, and a switch control module, where the control module includes a demodulator and a main CPU, where

The CMMB terminal antenna receives the CMMB signal in the space, increases the bandwidth through the RF matching circuit and the band pass filter outside the CMMB chip, improves the receiving performance, and then enters the tuner inside the CMMB chip through the RF RF end of the CMMB chip. The tuner is sent to the demodulator via a low noise amplifier LNA, mixing, DC correction, low pass filtering and gain amplification. The demodulator is a demodulation chip that receives the zero intermediate frequency signal from the tuner and is demodulated. After the channel demodulation and forward error correction, the transmission TS stream forming the standard format is sent to the main CPU for decoding and restoration; at the same time, the reception performance index is read by the demodulator, and the indicators are fed back to the switch control module for judgment, by the switch The control module selects the optimal frequency point for playing the locked frequency point. At this point, the CMMB chip selects the appropriate frequency to start normal playback.

Specifically, the demodulator has a programmable digital signal processing DSP hardware system with multiple interface functions (USB, secure digital input and output SDIO, serial peripheral interface SPI and BUS bus), and built-in multi-protocol package forward correction Wrong MPE-FEC memory. The demodulator controls the tuner through an I2C (Inter- Integrated Circuit) bus. The demodulator processes the IQ-like differential signal from the tuner, mediates it into a standard TS stream and sends it to the main CPU to decode and restore and read the desired power intensity value, signal-to-noise ratio value SNR, bit error rate value BER, by reading Take the receiving performance indicator and the main CPU feeds back to the switch control module for judgment.

As shown in FIG. 2, it is a structural diagram of a first embodiment of the present invention, and provides a CMMB terminal receiving apparatus, which is located in a CMMB chip, including The control module 201 is configured to send a signal performance parameter to the determination start module; and, after the search is completed, the command comparison module starts to work, and receives the comparison result fed back by the comparison module, and runs the prompt module according to the comparison result, and according to the received The message fed back by the prompting module, if it is a switching message, switches to the searched frequency point. If the message is kept, the CMMB chip will continue to play the original frequency point for playing;

The determining start module 202 is configured to determine whether to start the search module according to the signal performance parameter; specifically, using the signal to noise ratio as the signal performance parameter, if the value of the signal to noise ratio is always greater than or equal to a specific working value within a fixed time period (hypothesis When 4), the determination start module considers that the reception performance index of the frequency point meets the requirement, and does not start the search module for searching; when the signal-to-noise ratio of the program frequency being played is maintained at less than 4 in a fixed period of time, The decision start module causes the search module to start working.

The searching module 203 is configured to search for available frequency points in the vicinity of the terminal receiver within a fixed period of time, and if the available frequency points are searched, save the receiving performance parameters of the available frequency points to the RAM inside the CMMB;

Specifically, the search module searches for available frequency points near the terminal, and stores the receiving performance parameters of the frequency points, such as receiving sensitivity, signal to noise ratio, and the like in the RAM of the CMMB chip itself; the saving module 204 is a random access memory. a RAM, configured to save a receiving performance parameter of the available frequency point;

The comparison module 205 compares the receiving performance parameter of the available frequency point collected in the search module with the frequency receiving performance parameter of the currently playing program of the terminal, and feeds back the comparison result to the control module, where the comparison result is that the program is being played. The frequency point reception performance parameter is better than the received performance parameter of the searched available frequency point or the frequency point reception performance parameter of the currently playing program is worse than the received performance parameter of the searched available frequency point.

The prompting module 206 is configured to: when the frequency receiving performance parameter of the program being played is worse than the received performance parameter of the searched available frequency point, the user operation interface is cut according to the command of the control module. When the prompt is changed, the user can select whether to switch or keep according to the prompt, and if the user agrees to switch, send the switching information to the control module;

Specifically, if the receiving performance parameter of the locked frequency point is worse than the receiving performance parameter of the searched frequency point in the RAM, then the prompting module is switched to the prompting module, and the prompting information is displayed on the current operation interface of the user, and the user is asked whether to perform the switching, if If yes, the switching information is sent to the control module; if no, the holding information is sent to the control module. As shown in FIG. 3, a flowchart of a second embodiment of the present invention provides a CMMB terminal receiving method, including

Step S301: When the CMMB terminal plays normally, determine whether to start searching for available frequency points according to the signal performance parameter of the current playing frequency point;

Specifically, if the signal-to-noise ratio is used as the signal performance parameter, if the value of the signal-to-noise ratio is always greater than or equal to a specific working value (here, 4) in a fixed period of time, it is considered that the receiving performance index of the frequency point is satisfied. It is required that the search for available frequency points is not started; when the signal-to-noise ratio of the frequency of the program being played is kept at less than 4 for a fixed period of time, the search for available frequency points is started.

Step S302, the CMMB terminal searches for available frequency points near the receiver of the terminal within a fixed period of time, and if the available frequency points are searched, the receiving performance parameters of the available frequency points are saved to the RAM inside the CMMB;

Specifically, the CMMB terminal searches for available frequency points near the terminal, and stores the receiving performance parameters of the frequency points, such as receiving sensitivity, signal to noise ratio, etc., in the RAM of the CMMB chip itself;

Step S303, after the search is completed, comparing the reception performance parameter of the available frequency points collected in the search module with the frequency reception performance parameter of the current program being played by the terminal, to obtain a comparison result;

Specifically, the comparison result includes that the frequency receiving performance parameter of the currently playing program is better than the received performance parameter of the searched available frequency point, or the receiving performance parameter difference is at the frequency of playing the program. Receive performance parameters of the available frequency points searched.

Step S304, after the search is completed, comparing the reception performance parameter of the available frequency point collected by the search module with the frequency reception performance parameter of the current program being played by the terminal, and obtaining a comparison result;

The receiving performance parameter of the locked frequency point is worse than the receiving performance parameter of the searched frequency point in the RAM, then the prompt information is displayed on the current operation interface of the user, asking the user whether to perform the switching, and if yes, sending the switching information; If no is selected, the hold message is sent.

Step S305: According to the received feedback message, if the message is switched, the frequency is switched to the searched frequency point. If the message is maintained, the CMMB chip will continue to play the original frequency point. The above description shows and describes a preferred embodiment of the present invention, but as described above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as being Other combinations, modifications, and environments are possible and can be modified by the teachings of the above teachings or related art within the scope of the inventive concept described herein. All changes and modifications made by those skilled in the art are intended to be within the scope of the appended claims. Industrial applicability

The invention is mainly implemented by software programming inside the CMMB chip, and does not need to add additional hardware, so that the CMMB terminal can always work at the frequency of receiving the best performance to achieve optimal playback.

Claims

Claim

A CMMB terminal receiving method, the method comprising

Search for available frequency points when the CMMB terminal is playing normally;

2. The method according to claim 1, wherein, before searching for an available frequency point, the CMMB terminal determines whether to start searching for an available frequency point according to a signal performance parameter of a current playing frequency point.

3. The method according to claim 2, wherein after searching for available frequency points, the method further comprises:

The reception performance parameter of the available frequency point is compared with the reception performance parameter of the program frequency being played by the CMMB terminal.

4. The method according to claim 3, wherein, when the reception performance parameter of the broadcast program frequency is worse than the reception performance parameter of the available frequency point,

The method according to any one of claims 1 to 4, wherein after searching for the available frequency points, the method further comprises: saving a reception performance parameter of the available frequency points.

The method according to any one of claims 2 to 4, wherein the CMMB terminal determines whether to start searching for available frequency points according to signal performance parameters of the current playing frequency point, specifically:

7. A CMMB terminal receiving device, the device comprising:

a search module, configured to search for available frequency points when the CMMB terminal is playing normally; And a control module, configured to switch a frequency point of the CMMB terminal to play the program to the searched available frequency point when the receiving performance parameter of the playing program frequency point is worse than the receiving performance parameter of the available frequency point.

8. The apparatus according to claim 7, wherein the apparatus further comprises

9. The apparatus according to claim 8, wherein the apparatus further comprises

10. The apparatus according to claim 9, wherein the apparatus further comprises

a prompting module, configured to provide a prompt for switching to the user;

The device according to claim 10, wherein the device further comprises: a saving module, configured to save the receiving performance parameter of the available frequency point after searching for the available frequency point.