CN101917562A - Mobile phone television terminal and implementation method thereof - Google Patents
Mobile phone television terminal and implementation method thereof Download PDFInfo
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- CN101917562A CN101917562A CN2010102361025A CN201010236102A CN101917562A CN 101917562 A CN101917562 A CN 101917562A CN 2010102361025 A CN2010102361025 A CN 2010102361025A CN 201010236102 A CN201010236102 A CN 201010236102A CN 101917562 A CN101917562 A CN 101917562A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4383—Accessing a communication channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/455—Demodulation-circuits
Abstract
The invention discloses a mobile phone television terminal and an implementation method thereof for solving the technical problems of interference introduced into a pass band of a common broadband mobile phone television filter and the like. In the mobile phone television terminal, a matching circuit with variable physical property is used with a broadband band-pass filter to implement a narrow-band filter with variable center frequency, a control unit outputs a control signal according to television program band information to change the parameter of the matching circuit so as to perform frequency selection on a broadband television signal to output a narrow-band television signal, and the narrow-band television signal subjected to band-pass filter is output to a television signal processing unit and processed so as to improve the receiving signal-to-noise radio of a mobile phone television, enhance the quality of the received signal and improve the receiving performance of the mobile phone television.
Description
Technical field
The present invention relates to technical field of mobile TV, relate in particular to a kind of mobile phone TV terminal and its implementation.
Background technology
Mobile TV is meant with the mobile phone to be terminal and can to receive, play the equipment of Digital Television.There are four big main flow mobile TV standard: DVB-T (video broadcasting of digital video broadcasting for terrestrial digital ground) in the whole world at present, DVB-H (Digital Video Broadcasting Handheld hand-held digital video broadcast), ISDB-T (broadcasting of integrated service digital broadcast-terrestrial floor synthetic service digits), CMMB (China Mobile Multimedia Broadcasting Mobile Multimedia Broadcasting) etc., these several big standards can be operated in UHF (Ultrahigh Frequency, hyperfrequency) frequency range of 470MHz to about the 800MHz in, all adopt COFDM (coded orthogonal frequency divisionmultiplexing, Coded Orthogonal Frequency Division Multiplexing (COFDM)) modulation system transmits TV programme in the 8MHz bandwidth.
Be the interference of filtering mobile communication signal and other signal to the mobile TV signal, mobile phone TV terminal increases filtering devices such as band pass filter usually on the TV path, for guaranteeing the roaming function of mobile TV, the pass band width of this filter must comprise in the UHF wave band that mobile TV supports 470MHz to 800MHz broadband bandwidth, though such pass band width can stop passing through of mobile communication signal and low frequency signal, but can introduce other interference signal in the passband, cause the mobile TV received signal to noise ratio to reduce, thereby cause that the mobile TV receptivity worsens.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of mobile phone TV terminal and its implementation, can solve technical problems such as introducing interference in the broadband mobile TV filter passband.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of mobile phone TV terminal comprises antenna element, band pass filter, processing television signals unit; Described mobile phone TV terminal also comprises:
Match circuit is used for the broadband TV signal in the given mobile TV bin width scope of standard is carried out frequency-selecting, exports the narrow-band television signal corresponding with the TV programme frequency band;
Described match circuit and described band pass filter constitute the narrow band filter of tunable center frequency jointly, the signal of antenna element output is carried out frequency-selecting and filtering after, export the narrow-band television signal corresponding to described processing television signals unit with the TV programme frequency band.
Further, described match circuit is serially connected with between described antenna element and the described band pass filter, or be serially connected with between described band pass filter and the described processing television signals unit, or be connected in series first match circuit and second match circuit between described antenna element and the described band pass filter and between described band pass filter and the described processing television signals unit respectively.
Further, described mobile phone TV terminal also comprises:
Control unit, be used for to the described match circuit output control signal corresponding with the TV programme frequency band, described control signal is used to change the centre frequency and the pass band width of described match circuit, makes the centre frequency of described match circuit and pass band width consistent with the centre frequency and the bandwidth of the shared frequency band of TV programme signal.
Further, described mobile phone TV terminal also comprises: frequency band search unit, frequency band memory cell, playing control unit;
Described frequency band search unit is used to carry out the search of effective TV programme frequency band;
Described frequency band memory cell is used to store effective TV programme band information;
Described playing control unit is used for selecting from the effective TV programme band information of frequency band cell stores the band information of the TV programme of user's needs, and selected band information is sent to described control unit;
After described control unit receives the search frequency band information that described frequency band search unit sends or receives the TV programme band information that user that described playing control unit sends selects, produce control signal corresponding, described match circuit is exported the corresponding narrow-band television signal of selecting with described search frequency band information or user of TV programme band information under the control of described control signal;
When described frequency band search unit judges that according to the feedback information of processing television signals unit the frequency band of current search is effective TV programme frequency band, the band information of current search is stored in described frequency band memory cell.
Further, described control unit, frequency band search unit, frequency band memory cell, playing control unit are arranged in the baseband chip of mobile phone TV terminal.
Based on said apparatus, the present invention also proposes a kind of implementation method of mobile phone TV terminal, and this method comprises:
Constitute the narrow band filter of tunable center frequency jointly by match circuit and band pass filter, obtain in the given mobile TV bin width scope of standard the TV programme selected with the user corresponding through filtered narrow-band television signal, and the narrow-band television signal of acquisition is exported to the processing television signals unit handles.
Further, the method for the corresponding narrow-band television signal of the TV programme selected of described acquisition and user is:
Described match circuit is serially connected with between described antenna element and the described band pass filter, or be serially connected with between described band pass filter and the described processing television signals unit, or be connected in series first match circuit and second match circuit between described antenna element and the described band pass filter and between described band pass filter and the described processing television signals unit respectively;
Change the centre frequency and the pass band width of described match circuit by the control signal corresponding with the TV programme frequency band, make the centre frequency and the pass band width of described match circuit consistent with the centre frequency and the bandwidth of TV programme frequency band, broadband TV signal is exported the corresponding narrow-band television signal of selecting with the user behind bandpass filtering of TV programme behind described match circuit and described band pass filter.
Further, described method also comprises:
Based on the shared frequency bandwidth of TV programme effective TV programme frequency band of search in the mobile TV bin width scope of agreement regulation of agreement regulation, control the described match circuit output narrow-band television signal corresponding with described search frequency band by the control signal corresponding with search frequency band; When judging that according to processing television signals unit feedack the current search frequency band is effective TV programme frequency band, store this effective TV programme frequency band.
Further, described method also comprises:
From effective TV programme band information of storage, obtain the TV programme band information that the user selects, produce control signal according to user-selected TV programme band information and export to described matching unit, thereby make described matching unit carry out the frequency-selecting output narrow-band television signal corresponding with user-selected TV programme frequency band to broadband TV signal.
Further, described control signal sends to described match circuit by baseband chip; Effectively search, storage and the broadcast of TV programme band information are realized by baseband chip.
The present invention is in mobile phone TV terminal, the match circuit and the broadband band-pass filter of variable physical property are used in combination, to realize the narrow-band filtering circuit of variable center frequency, the parameter of match circuit is set according to effective TV signal band information by control unit, make match circuit can in broadband television signal, choose the narrow-band television signal corresponding with the TV programme frequency band, and by the outer interference signal of band pass filter filtering passband, thereby control TV process chip receives only the TV programme signal of appointment, improved the mobile TV received signal to noise ratio, strengthen the quality of received signal, improved the receptivity of mobile TV.
Description of drawings
Fig. 1 is a kind of mobile phone TV terminal structural representation of the present invention;
Fig. 2 is a kind of schematic diagram of adjusting the match circuit of physical characteristic that mobile phone TV terminal of the present invention adopted;
Fig. 3 is the structural representation of another kind of mobile phone TV terminal provided by the invention;
Fig. 4 is a kind of mobile phone TV terminal implementation method flow chart provided by the invention.
Embodiment
Because the TV programme of TV station all is by transmitting in the bandwidth of COFDM mode about 8MHZ, the mobile TV bin width of this bandwidth much smaller than the given 470MHz of standard to 800MHz, when the words that adopt common broadband band-pass filter, consider mobile TV between different regions roaming and filter in no adjustable device, so the passband width of common broadband band-pass filter must satisfy the mobile TV bin width of the given 470MHz of standard to 800MHz, though this moment can filtering mobile communication signal and the noise signal of low-frequency range, but can introduce useless noise signal in the passband.
Basic thought of the present invention is, in mobile phone TV terminal, add adjustable match circuit, constitute the narrow band filter of tunable center frequency jointly by adjustable match circuit and normal tape bandpass filter, obtain the corresponding narrow-band television signal of TV programme with user's selection in the given mobile TV bin width scope of standard, and will the narrow-band television signal behind bandpass filtering export to the processing television signals unit and handle.Because this match circuit has adopted the device that can adjust physical characteristic, then can adjust the physical characteristic of match circuit according to the control signal of control circuit output in the mobile TV, the resonance frequency that changes match circuit is consistent with the centre frequency of TV programme signal frequency range, the narrow-band television signal of the TV programme frequency band correspondence that the user is selected is chosen out, then through band pass filter filtering out-of-band noise, thereby improve the mobile TV received signal to noise ratio, strengthen the quality of received signal.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 3 is the structural representation of a kind of mobile phone TV terminal provided by the invention, and this mobile phone TV terminal 100 comprises: antenna element 101, match circuit 102, band pass filter 103, control unit 105, processing television signals unit 104;
Antenna element 101 is used to receive the mobile TV signal, and outputs it to match circuit; The mobile TV signal that described antenna element is exported to match circuit comprises the TV programme signal of all TV stations in the given mobile TV bin width of mobile TV standard;
Match circuit 102, the broadband TV signal that is used under the control of the control signal that control unit sends antenna element being exported carries out frequency-selecting, output and the corresponding narrow-band television signal of described effective TV signal band information;
Band pass filter 103, be used to receive the TV signal through frequency-selecting of match circuit output, the match circuit outgoing television signal is carried out bandpass filtering, remove and disturb and noise, and will export to the processing television signals unit through filtered narrow-band television signal and handle;
Processing television signals unit 104, the narrow-band television signal that is used for reception bandpass filter 103 outputs, and it is carried out processing such as frequency conversion, demodulation, decoding from the high frequency to the low frequency, export the audio frequency and video output equipment that treated audio-video signal is given described mobile phone TV terminal then.
Control unit 105 is used for to the match circuit 102 outputs control signal corresponding with the TV programme band information; Described control signal is used to change the physical parameter of the adjustable device in the match circuit, thereby change the centre frequency and the pass band width of described match circuit, make the centre frequency of match circuit and pass band width consistent with the centre frequency and the bandwidth of TV programme frequency band;
Among the present invention, because the TV signal that is input to the processing television signals unit is disturbed for removing, the narrow-band television signal behind the noise, therefore avoided of the interference of other frequency band to the TV programme band signal of user's needs, thereby improved the received signal to noise ratio of TV signal, improved the mobile TV receptivity.
In another preferred embodiment of the present invention, described match circuit 102 is serially connected with between band pass filter 103 and the processing television signals unit 104, in this embodiment, described band pass filter is the broadband TV signal of reception antenna unit output at first, broadband TV signal to antenna element output carries out bandpass filtering, suppress the outer signal of the given mobile TV bin width of mobile TV standard, signal in the bin width is removed interference and noise, then the broadband TV signal behind bandpass filtering is exported to match circuit, match circuit carries out frequency-selecting to the broadband TV signal behind bandpass filtering again, exports the narrow-band television signal corresponding with user-selected TV programme signal frequency band.
In another preferred embodiment of the present invention, between between antenna element 101 and the band pass filter 103 and band pass filter 103 and processing television signals unit 104, be connected in series the first match circuit 102A and the second match circuit 102B respectively, the circuit physical parameter of first match circuit and second match circuit is identical, and described control unit uses identical control signal to control first match circuit and second match circuit respectively.
Based on foregoing description as can be known, the present invention is with match circuit and the general common narrow band filter of forming a tunable center frequency of broadband band-pass filter combination, adjust the centre frequency and the pass band width of the narrow band filter of this tunable center frequency by the control signal corresponding of control unit output with the TV programme frequency band, thereby output has the corresponding narrow-band television signal of TV programme frequency band higher signal to noise ratio and user-selected, has improved the mobile TV receptivity.
Fig. 2 is the schematic diagram of a kind of match circuit provided by the invention, contain devices such as variable capacitance and variable inductance in this match circuit, the control signal of control unit output is applied to these adjustable electric perhaps on the device such as controllable impedance, change the capacitance or the inductance value of these adjustable devices, owing between capacitance and the inductance value certain exponential relationship is arranged in the resonance centre frequency of match circuit and the match circuit, so it is consistent with the centre frequency of selected TV programme frequency band to realize adjusting the resonance centre frequency of match circuit, this moment, broadband TV signal can screen the TV programme band signal of needs through behind the match circuit, but because match circuit can't be clean the filtration of interference signals such as noise fully, so also must together interference signal be filtered by the combined belt bandpass filter.Band pass filter and match circuit promptly can also can carry out band-pass filter earlier, and then carry out the frequency-selecting of match circuit earlier by carrying out filtering by band pass filter again after the match circuit frequency-selecting before and after being regardless of aspect the processing mobile TV signal.
Described control unit produces control signal according to the TV programme band information, for example, control unit can utilize a DAC circuit (Digital-to-Analog Converter digital-analog convertor) to produce control signal (as variable voltage signal), variable voltage control variable capacitance diode or voltage-controlled inductance, adjust the equivalence appearance value C0 of electric capacity or the equivalence sense value L0 of inductance, the change of C0 and L0 and then cause the change of described match circuit centre frequency F.
Further, as shown in Figure 3, mobile phone TV terminal of the present invention also can comprise: frequency band search unit, frequency band memory cell, playing control unit;
Described frequency band search unit is used to carry out the search of effective TV programme frequency band, because the shared frequency band of each regional TV programme position difference, therefore before watching mobile TV, need the shared frequency band of the TV programme of TV station is searched for, after searching effective TV programme frequency band, store effective TV programme band information into the frequency band memory cell.
The mode of concrete search can be: described frequency band search unit is that window slides in the mobile TV bin width scope of agreement regulation with the shared frequency bandwidth of TV programme of agreement regulation, send the band information of current search to control unit, control unit produces the control signal corresponding with described search frequency band information according to the band information that receives and exports to match circuit, the narrow band filter output narrow-band television signal corresponding with described search frequency band by match circuit and the common tunable center frequency of forming of band pass filter given the processing television signals unit, the processing television signals unit carries out demodulation to the received signal, processing such as decoding, and to described frequency band search unit feedback signal quality, parameter informations such as signal to noise ratio, when the signal quality of described frequency band search unit according to processing television signals unit feedback, parameter informations such as signal to noise ratio determine when comprising effective TV programme signal in the current search frequency band, and the TV programme band information of correspondence is stored in the frequency band memory cell;
Described frequency band memory cell is used to store effective TV programme band information;
Described playing control unit is used for selecting from effective TV programme band information of frequency band cell stores according to user's instruction the band information of the TV programme of user's needs, selected TV programme band information is sent to control unit and processing television signals unit, control unit produces control signal corresponding according to the band information that receives and exports to match circuit, match circuit carries out exporting the corresponding narrow-band television signal of TV programme frequency band that needs with the user after the frequency-selecting to broadband TV signal, and the processing television signals unit is handled the narrow-band television signal according to the TV programme band information that the user who receives selects.
Preferably, one or more being arranged in the baseband processing chip in described control unit, frequency band search unit, frequency band memory cell, the playing control unit, also can by other independently chip realize; Baseband processing chip is as the central control processor of mobile phone, and functions such as the control of each submodule of mobile phone and management can be provided, and assist the processing television signals unit together to TV signal decode, television video demonstration, audio frequency output etc.
Based on above-mentioned mobile phone TV terminal, the present invention also provides a kind of implementation method of mobile phone TV terminal, and as shown in Figure 4, this method is specially:
Step 401: search for and store effective TV programme band information;
The shared frequency bandwidth of TV programme effective TV programme frequency band of search in the mobile TV bin width scope of agreement regulation based on the agreement regulation, by the control signal control match circuit corresponding broadband TV signal is carried out frequency-selecting with search frequency band, when judging that according to processing television signals unit feedack the current search frequency band is effective TV programme frequency band, store this effective TV programme band information.
Step 402: the TV programme band information of from effective TV programme band information of storage, selecting user's needs according to user instruction;
Step 403: effective TV programme band information of selecting according to the user produces control signal, described control signal is used to change the physical parameter of the adjustable device in the match circuit, thereby change the centre frequency and the pass band width of described match circuit, make the centre frequency of described match circuit and pass band width consistent with the centre frequency and the bandwidth of the shared frequency band of TV programme signal.
Step 404: match circuit is chosen the corresponding narrow-band television signal of selecting with the user of TV programme frequency band in the mobile TV bin width scope of agreement regulation under the control of control signal;
Step 405: the audio frequency and video output equipment of treated audio-video signal to described mobile phone TV terminal export after the narrow-band television signal of the narrow band filter output of the tunable center frequency be made up of match circuit and band pass filter is carried out frequency conversion, demodulation, decoding etc. and handles in the processing television signals unit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. a mobile phone TV terminal comprises antenna element, band pass filter, processing television signals unit; It is characterized in that described mobile phone TV terminal also comprises:
Match circuit is used for the broadband TV signal in the given mobile TV bin width scope of standard is carried out frequency-selecting, exports the narrow-band television signal corresponding with the TV programme frequency band;
Described match circuit and described band pass filter constitute the narrow band filter of tunable center frequency jointly, the signal of antenna element output is carried out frequency-selecting and filtering after, export the narrow-band television signal corresponding to described processing television signals unit with the TV programme frequency band.
2. mobile phone TV terminal according to claim 1, it is characterized in that, described match circuit is serially connected with between described antenna element and the described band pass filter, or be serially connected with between described band pass filter and the described processing television signals unit, or be connected in series first match circuit and second match circuit between described antenna element and the described band pass filter and between described band pass filter and the described processing television signals unit respectively.
3. mobile phone TV terminal according to claim 1 and 2 is characterized in that, described mobile phone TV terminal also comprises:
Control unit, be used for to the described match circuit output control signal corresponding with the TV programme frequency band, described control signal is used to change the centre frequency and the pass band width of described match circuit, makes the centre frequency of described match circuit and pass band width consistent with the centre frequency and the bandwidth of the shared frequency band of TV programme signal.
4. mobile phone TV terminal according to claim 3 is characterized in that, described mobile phone TV terminal also comprises: frequency band search unit, frequency band memory cell, playing control unit;
Described frequency band search unit is used to carry out the search of effective TV programme frequency band;
Described frequency band memory cell is used to store effective TV programme band information;
Described playing control unit is used for selecting from the effective TV programme band information of frequency band cell stores the band information of the TV programme of user's needs, and selected band information is sent to described control unit;
After described control unit receives the search frequency band information that described frequency band search unit sends or receives the TV programme band information that user that described playing control unit sends selects, produce control signal corresponding, described match circuit is exported the corresponding narrow-band television signal of selecting with described search frequency band information or user of TV programme band information under the control of described control signal;
When described frequency band search unit judges that according to the feedback information of processing television signals unit the frequency band of current search is effective TV programme frequency band, the band information of current search is stored in described frequency band memory cell.
5. mobile phone TV terminal according to claim 4 is characterized in that, described control unit, frequency band search unit, frequency band memory cell, playing control unit are arranged in the baseband chip of mobile phone TV terminal.
6. the implementation method of a mobile phone TV terminal is characterized in that, this method comprises:
Constitute the narrow band filter of tunable center frequency jointly by match circuit and band pass filter, obtain in the given mobile TV bin width scope of standard the TV programme selected with the user corresponding through filtered narrow-band television signal, and the narrow-band television signal of acquisition is exported to the processing television signals unit handles.
7. method according to claim 6 is characterized in that, the method for the narrow-band television signal that described acquisition is corresponding with the TV programme that the user selects is:
Described match circuit is serially connected with between described antenna element and the described band pass filter, or be serially connected with between described band pass filter and the described processing television signals unit, or be connected in series first match circuit and second match circuit between described antenna element and the described band pass filter and between described band pass filter and the described processing television signals unit respectively;
Change the centre frequency and the pass band width of described match circuit by the control signal corresponding with the TV programme frequency band, make the centre frequency and the pass band width of described match circuit consistent with the centre frequency and the bandwidth of TV programme frequency band, broadband TV signal is exported the corresponding narrow-band television signal of selecting with the user behind bandpass filtering of TV programme behind described match circuit and described band pass filter.
8. method according to claim 6 is characterized in that, described method also comprises:
Based on the shared frequency bandwidth of TV programme effective TV programme frequency band of search in the mobile TV bin width scope of agreement regulation of agreement regulation, control the described match circuit output narrow-band television signal corresponding with described search frequency band by the control signal corresponding with search frequency band; When judging that according to processing television signals unit feedack the current search frequency band is effective TV programme frequency band, store this effective TV programme frequency band.
9. method according to claim 8 is characterized in that, described method also comprises:
From effective TV programme band information of storage, obtain the TV programme band information that the user selects, produce control signal according to user-selected TV programme band information and export to described matching unit, thereby make described matching unit carry out the frequency-selecting output narrow-band television signal corresponding with user-selected TV programme frequency band to broadband TV signal.
10. method according to claim 8 is characterized in that described control signal sends to described match circuit by baseband chip; Effectively search, storage and the broadcast of TV programme band information are realized by baseband chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102361025A CN101917562A (en) | 2010-07-23 | 2010-07-23 | Mobile phone television terminal and implementation method thereof |
| PCT/CN2010/078726 WO2012009906A1 (en) | 2010-07-23 | 2010-11-15 | Mobile phone television terminal and realization method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102361025A CN101917562A (en) | 2010-07-23 | 2010-07-23 | Mobile phone television terminal and implementation method thereof |
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| CN101917562A true CN101917562A (en) | 2010-12-15 |
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| CN2010102361025A Pending CN101917562A (en) | 2010-07-23 | 2010-07-23 | Mobile phone television terminal and implementation method thereof |
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| CN (1) | CN101917562A (en) |
| WO (1) | WO2012009906A1 (en) |
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| CN105846834A (en) * | 2016-03-14 | 2016-08-10 | 青岛海信移动通信技术股份有限公司 | Radio-frequency signal filtering method and wireless communication equipment |
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| WO2012009906A1 (en) | 2012-01-26 |
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