CN101626106A - Switching method of built-in antenna and exposed antenna of FM receiver as well as terminal thereof - Google Patents
Switching method of built-in antenna and exposed antenna of FM receiver as well as terminal thereof Download PDFInfo
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Abstract
The invention provides a switching method of a built-in antenna and an exposed antenna of an FM receiver as well as a corresponding terminal thereof. The terminal comprises an FM receiver, the built-in antenna, the exposed antenna, a CPU, a detection module and an antenna switching module. The CPU detects that the exposed antenna is switched in when the terminal switches in the exposed antenna in the on-state of the FM receiver; the detection module is used for detecting the RSSI of signals received by the built-in antenna and the exposed antenna; the selection module is used for comparing the RSSI values of the signals received by the built-in antenna and the exposed antenna, which are detected by the detection module. The antenna with the larger RSSI value is selected, and then the CPU controls the antenna switching module to switch in the selected antenna as the current receiving antenna. The switching method performs a switching between the built-in antenna and the exposed antenna according to the quality of the signals received by the built-in antenna and the exposed antenna from a station, can realize a seamless switching between the built-in antenna and the exposed antenna, and raises the receiving quality and the effect of the FM receiver.
Description
Technical field
The present invention relates to field of antenna, relate in particular to a kind of frequency modulation (Frequency Modulation is hereinafter to be referred as FM) built-in aerial of receiver and the changing method of external antenna and relevant terminal.
Background technology
Along with the progress of science and technology and the raising of people's living standard, people are also more and more higher for the requirement of amusement, and the FM receiver has been subjected to more and more users' favor as a kind of function of terminal.The most of earphone that adopts of the current FM chip that terminal adopted if cause the user to want to listen to FM, must insert earphone as the FM reception antenna.Remove to listen FM if want to switch to loud speaker, also must need to insert earphone, it is very inconvenient that the user is operated.In order to satisfy user's demand, the connection that the FM chip support built-in aerial of minority producer is arranged, but show through experiment, because built-in aerial is on mainboard, can be subjected to the shielding and relevant GSM (the Global System for MobileCommunications of shell, global system for mobile communications), WCDMA (Wideband Code DivisionMultiple Access, broadband demal multiplex (MUX) access) interference and other electromagnetic interference of aerial signal, it is relatively poor as the antenna receptivity that the performance of built-in aerial is compared earphone.When the user uses built-in aerial, just can pass through loudspeaker plays sound though can not need to insert earphone, when the user want to listen FM to broadcast with earphone, terminal still adopted the built-in aerial reception to broadcast, and the receptivity broadcasted of FM is greatly affected like this.Present FM chip business men only provides a kind of connection of antenna, can only use the wherein a kind of of built-in aerial or external earphone antenna, link the FM chip then if directly built-in aerial and external earphone antenna are connected together, then can cause the mutual interference between the antenna.
Summary of the invention
The technical problem to be solved in the present invention provides the changing method and the relevant terminal thereof of the built-in aerial and the external antenna of FM receiver, can realize the seamless switching between built-in aerial and the external antenna.
In order to address the above problem, the invention provides a kind of built-in aerial of FM receiver and the changing method of external antenna, comprising:
Terminal detects the access external antenna under the state of opening the FM receiver;
Detect the received signal intensity indication (RSSI) of built-in aerial and external antenna received signal;
The size of the RSSI value of more detected built-in aerial and external antenna received signal selects the big antenna of RSSI value as current reception antenna.
Further, above-mentioned changing method also can have following characteristics: the antenna that described selection RSSI value is big as current reception antenna specific implementation is:
After every a period of time through setting, compare the RSSI value of built-in aerial and external antenna received signal, terminal switches to reception antenna the big antenna of RSSI value of received signal automatically.
Further, above-mentioned changing method also can comprise,
The RSSI value of described current reception antenna received signal and the threshold value of corresponding received signal are compared, if the RSSI value of described current reception antenna received signal is less than described threshold value, then reduce described threshold value, make described threshold value be lower than the RSSI value of described current reception antenna received signal.
Further, above-mentioned changing method also can have following characteristics, also comprise,
The RSSI value information on the low side that on the display interface of terminal, shows described current reception antenna received signal.
The present invention also provides a kind of terminal, comprise FM receiver, built-in aerial, external antenna, CPU, detection module and antenna handover module, described CPU is connected with described FM receiver by the I2C bus, described CPU is connected with described antenna handover module by the I/O mouth, described antenna handover module is connected with described FM receiver by the antenna access port, wherein
Opening when inserting external antenna in the state of FM receiver when terminal, described CPU detects the access external antenna;
Described detection module is used to detect the RSSI of built-in aerial and external antenna received signal;
Described selection module is used for the size of the RSSI value of detected built-in aerial of more described detection module and external antenna received signal, selects the big antenna of RSSI value;
Described CPU controls described antenna handover module and connects the selected antenna of described selection module as current reception antenna.
Further, above-mentioned terminal comprises that also memory module and thresholding change module, stores the threshold value of built-in aerial and external antenna received signal in the described memory module,
If the RSSI value of described current reception antenna received signal is during less than corresponding threshold value, described thresholding changes module and is used to reduce corresponding threshold value, makes threshold value be lower than the RSSI value of described current reception antenna received signal.
Further, above-mentioned terminal also comprises, display module,
When the RSSI of described current reception antenna received signal value during less than corresponding threshold value, described display module is used to show the RSSI value information on the low side of current reception antenna received signal.
Further, above-mentioned terminal also can have following characteristics, and described antenna handover module is the two-way antenna selection switch.
The built-in aerial of FM receiver provided by the invention and the changing method of external antenna and relevant terminal thereof are switched between built-in aerial and external antenna according to the signal quality that built-in aerial and external antenna receive the radio station, can realize the seamless switching between built-in aerial and the external antenna, quality and effect that the FM receiver is listened to have been promoted, and user-friendly, this method is with the promotion of good sense.
Description of drawings
Fig. 1 is the schematic diagram of the terminal of the embodiment of the invention.
Fig. 2 is the flow chart of the automatic switching method of the built-in aerial of FM receiver of the embodiment of the invention and external antenna.
Embodiment
Be described in further detail below in conjunction with the preferred embodiment of accompanying drawing technical scheme of the present invention.
Fig. 1 is the schematic diagram of the terminal of the embodiment of the invention, describes the terminal according to the embodiment of the invention below in detail.
The terminal of the embodiment of the invention comprises FM receiver, built-in aerial, external antenna, CPU and antenna handover module.
CPU is connected with the FM receiver by the I2C bus, CPU is by GPIO (General PurposeInput Output, general I/O) whether a mouthful detection inserts external antenna, CPU selects to connect built-in aerial or external antenna by GPIO control antenna handover module, and the antenna handover module is connected with the FM receiver by the antenna access port.
Opening when inserting external antenna in the state of FM receiver when terminal, for example inserting earphone, can detect the insertion of earphone by the GPIO mouth of CPU.If CPU detects earphone and inserts, and built-in aerial is also in connection status, and CPU can read the signal of FM receiver in real time by the I2C bus so, i.e. the signal that is received by built-in aerial and external antenna.
Terminal comprises detection module and selects module that CPU can realize detection module in conjunction with corresponding software and select the function of module.The received signal intensity indication (Received Signal Strength Indicator is called for short RSSI) that detection module is used for built-in aerial and external antenna received signal detects; Select module to compare, select the bigger reception antenna of RSSI value by the RSSI value of detected built-in aerial of detection module and external antenna received signal.CPU control antenna handover module is connected the reception antenna of selecting module selected then.
Terminal also comprises memory module and thresholding change module, store the initial default threshold value of built-in aerial and external antenna received signal in the memory module, threshold value can be established high point in the reasonable place of signal, threshold value can be established low spot in the place that signal is poor, because when FM receiver the time at automatic channel search, that mainly rely on is exactly minimum threshold RSSI, this threshold setting low more, the platform that then searches out is many more, but can not guarantee the signal quality in all radio station, and can search out the sky platform.If it is higher that this thresholding is provided with, the radio station number that then searches out can tail off, but fair all fine.Because reception antenna only can search out the signal of RSSI value greater than threshold value, so in the poor place of signal, if the RSSI value of current reception antenna received signal is less than corresponding predetermined threshold value, then thresholding change module will reduce this predetermined threshold value, so that threshold value is lower than the RSSI value of current reception antenna received signal, to guarantee under the more weak situation of signal, also can to search out the radio station.
In the present embodiment, the antenna handover module can be selected the two-way antenna selection switch, avoid because the time delay that causes of software processes, and that has avoided two kinds of antennas directly to link together causing interferes with each other etc., has accelerated the speed that antenna switches.In the process that two kinds of antennas switch, the audibility of receiver is unaffected, and can not feel has the phenomenon of pause, i.e. seamless switching.
Because built-in aerial and external antenna are for the FM receiver, inner processing method difference, so when carrying out the switching of built-in aerial and external antenna at every turn, need the I2C bus by CPU be configured, the antenna mask register position of correspondence is configured to 0 or 1 adopting the register of built-in aerial and external antenna correspondence in the FM chip.
In actual applications, can only need antenna handover module (for example, two-way antenna selection switch) to be controlled with the GPIO mouth of CPU.When this GPIO mouth is changed to output, if the output high level is then controlled the two-way antenna selection switch and selected external antenna; If during output low level, then control the two-way antenna selection switch and select built-in aerial.When this GPIO mouth being changed to when input, CPU can judge built-in aerial and the state selected of external antenna this moment according to the high-low level that reads out.
The terminal of present embodiment can also comprise display module, with the situation of change of real-time demonstration by the RSSI value of built-in aerial and/or external antenna received signal, can make the user whether consider the manual switchover antenna according to the needs of oneself.
The terminal of present embodiment mainly is to come the built-in aerial and the external antenna of FM receiver are switched according to the strong and weak degree of the received signal of FM receiver, can realize the seamless switching between built-in aerial and the external antenna like this, guarantee the reception and the performance of FM receiver.
Fig. 2 is the flow chart of method of the automatic switchover of the built-in aerial of FM receiver of the embodiment of the invention and external antenna.The threshold value of built-in aerial and external antenna received signal is set in memory module in advance, and reception antenna generally only can search out the signal of RSSI value greater than threshold value.When the user selected to be provided with automatically, terminal scanned the RSSI of signals that built-in aerial and external antenna receive in real time, compared both RSSI value sizes, according to qualifications switched antenna in real time.As shown in Figure 2, the built-in aerial of the FM receiver of the embodiment of the invention and the changing method of external antenna comprise:
Step S201: on above-mentioned terminal, open the FM receiver.
Step S202: the CPU of terminal detects whether insert external antenna, if detect access external antenna, then execution in step S203; If do not detect access external antenna, then execution in step S207.
External antenna in the present embodiment adopts earphone, can just insert earphone before opening the FM receiver, also can insert earphone in the process that adopts built-in aerial to receive the radio station.
Step S203: the detection module of terminal detects the RSSI of signals of built-in aerial and external antenna reception in real time;
This step also comprises:
Step S2031, the antenna handover module switches to external antenna with reception antenna, and the FM receiver is by the external antenna received signal, and then detection module detects the signal that external antenna receives, and reads received RSSI of signals value A; Then,
Step S2032: the antenna handover module switches to built-in aerial with reception antenna, and the FM receiver is by the built-in aerial received signal, and then detection module detects the signal that built-in aerial receives, and reads received RSSI of signals value B.
When detecting the access external antenna, terminal detects the RSSI of signals value that built-in aerial and external antenna receive in real time in turn.
Step S204: the selection module of terminal compares the size of RSSI value A and RSSI value B, if RSSI value A is greater than RSSI value B, then execution in step S205; If RSSI value A is less than RSSI value B, then execution in step S206;
Come the selective reception antenna according to the quality of signals that built-in aerial and external antenna receive, the quality of signals height that the high explanation of RSSI value receives is so can preferably select the high antenna of RSSI value as reception antenna.
Step S205, CPU control antenna handover module is connected external antenna, receives the radio station, if the RSSI value in current reception radio station greater than default thresholding C, then keeps using external antenna; If the RSSI value in current reception radio station less than default thresholding C, then reduces the value of default thresholding C in real time, the RSSI value that makes current reception radio station guarantees also can search out the radio station under the situation of weak signal all the time greater than default thresholding C.After through a period of time of setting, return step S203.
Step S206, the antenna handover module switches to built-in aerial with reception antenna, receives the radio station, if the RSSI value in current reception radio station greater than default thresholding D, then keeps using built-in aerial; If the RSSI value in current reception radio station less than default thresholding D, then reduces the value of default thresholding D in real time, the RSSI value that makes current reception radio station guarantees also can search out the radio station under the situation of weak signal all the time greater than default thresholding D.After through a period of time of setting, return step S203.
Step S207 uses built-in aerial, searches platform, reads the RSSI value.
If do not insert external antenna, then the terminal acquiescence is used built-in aerial.Because built-in aerial and external antenna are for the FM receiver, inner processing method difference, if so use built-in aerial, then also need the I2C bus by CPU that the corresponding register of FM chip is configured in this case, can correctly select the access of built-in aerial like this.
Because external antenna is different with the quantity that built-in aerial searches out effective platform, after antenna is done to switch, the terminal real time scan searches out the RSSI in radio station, when the FM receiver is in the stronger position of signal, if the RSSI thresholding of searching platform that is provided with is too low, easily the more weak radio station of some signals or some harmonic waves on the mainboard are used as effective radio station and capture, can reduce the probability that searches out the sky platform so remove to set the minimum RSSI thresholding of searching platform according to the RSSI that receives in real time.
The built-in aerial of the FM receiver of the embodiment of the invention and the switching of external antenna can be automaticallyed switch by terminal, and also can be the user carries out manual switchover according to oneself needs.When the user is non-selected when being provided with automatically, can show the situation of change of the RSSI of signals that built-in aerial and external antenna receive on the display interface of terminal in real time, the user can manually be switched according to the needs of oneself.Illustrate the built-in aerial of FM receiver of the embodiment of the invention and the manual switchover method of external antenna below.
FM receiver during the user opens a terminal, acquiescence is used built-in aerial when supposing to open the FM receiver.When the user inserts external antenna/time, as inserting earphone, the CPU of terminal will detect the access external antenna.
Detection module automatically detects the signal quality in the radio station of being searched out by built-in aerial then, and reads the RSSI value.
On the display interface of terminal, can demonstrate situation of change in real time by the RSSI of built-in aerial received signal.
On terminal, set in advance the threshold value of built-in aerial and external antenna received signal, detection module compares its corresponding predetermined threshold value A of RSSI value of detected built-in aerial received signal, if this RSSI value is lower than threshold value A, then can display reminding user RSSI information on the low side on the display interface of terminal, the user can select the reception antenna of earphone as the FM receiver consciously; If the RSSI value is higher than threshold value A, then the display interface of terminal can show information such as reception is normal, and the user then can consider to switch reception antenna.
Certainly, in the above-described embodiments, on the display interface of terminal, can demonstrate situation of change simultaneously in real time by the RSSI of built-in aerial and external antenna received signal, can demonstrate in real time respectively by the RSSI value of built-in aerial and external antenna received signal and the comparison situation of its threshold value of presetting separately, for example, the information of " the built-in signal quality is on the low side ", " external signal quality is normal " etc., like this, the user can select whether to switch reception antenna according to the needs of oneself.
Above embodiment is built-in aerial and the changing method of external antenna and the example of relevant terminal of explanation according to FM receiver of the present invention; not should be understood to limitation of the present invention; description according to technical scheme of the present invention and preferred embodiment thereof; can make various possible being equal to and change or replacement, and all these changes or replacement all should belong to the protection range of claim of the present invention.
Claims (8)
1, the changing method of a kind of built-in aerial of FM receiver and external antenna comprises:
Terminal detects the access external antenna under the state of opening the FM receiver;
Detect the received signal intensity indication (RSSI) of built-in aerial and external antenna received signal;
The size of the RSSI value of more detected built-in aerial and external antenna received signal selects the big antenna of RSSI value as current reception antenna.
2, changing method as claimed in claim 1 is characterized in that, the big antenna of described selection RSSI value as current reception antenna specific implementation is:
After every a period of time through setting, compare the RSSI value of built-in aerial and external antenna received signal, terminal switches to reception antenna the big antenna of RSSI value of received signal automatically.
3, changing method as claimed in claim 1 or 2 is characterized in that, also comprise,
The RSSI value of described current reception antenna received signal and the threshold value of corresponding received signal are compared, if the RSSI value of described current reception antenna received signal is less than described threshold value, then reduce described threshold value, make described threshold value be lower than the RSSI value of described current reception antenna received signal.
4, changing method as claimed in claim 3 is characterized in that, also comprise,
The RSSI value information on the low side that on the display interface of terminal, shows described current reception antenna received signal.
5, a kind of terminal, comprise FM receiver, built-in aerial, external antenna, CPU, detection module and antenna handover module, described CPU is connected with described FM receiver by the I2C bus, described CPU is connected with described antenna handover module by the I/O mouth, described antenna handover module is connected with described FM receiver by the antenna access port, wherein
Opening when inserting external antenna in the state of FM receiver when terminal, described CPU detects the access external antenna;
Described detection module is used to detect the received signal intensity indication (RSSI) of built-in aerial and external antenna received signal;
Described selection module is used for the size of the RSSI value of detected built-in aerial of more described detection module and external antenna received signal, selects the big antenna of RSSI value;
Described CPU controls described antenna handover module and connects the selected antenna of described selection module as current reception antenna.
6, terminal as claimed in claim 5 is characterized in that, also comprises memory module and thresholding change module, stores the threshold value of built-in aerial and external antenna received signal in the described memory module,
If the RSSI value of described current reception antenna received signal is during less than corresponding threshold value, described thresholding changes module and is used to reduce corresponding threshold value, makes threshold value be lower than the RSSI value of described current reception antenna received signal.
7, terminal as claimed in claim 6 is characterized in that, also comprises display module,
When the RSSI of described current reception antenna received signal value during less than corresponding threshold value, described display module is used to show the RSSI value information on the low side of current reception antenna received signal.
8, as each described terminal of claim 5 to 7, it is characterized in that,
Described antenna handover module is the two-way antenna selection switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910160392 CN101626106B (en) | 2009-08-05 | 2009-08-05 | Switching method of built-in antenna and exposed antenna of FM receiver as well as terminal thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910160392 CN101626106B (en) | 2009-08-05 | 2009-08-05 | Switching method of built-in antenna and exposed antenna of FM receiver as well as terminal thereof |
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| CN101626106A true CN101626106A (en) | 2010-01-13 |
| CN101626106B CN101626106B (en) | 2013-08-21 |
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| CN 200910160392 Expired - Fee Related CN101626106B (en) | 2009-08-05 | 2009-08-05 | Switching method of built-in antenna and exposed antenna of FM receiver as well as terminal thereof |
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