CN105812080A - Radio signal automatic searching device and method and frequency modulation radio - Google Patents
Radio signal automatic searching device and method and frequency modulation radio Download PDFInfo
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- CN105812080A CN105812080A CN201410854642.8A CN201410854642A CN105812080A CN 105812080 A CN105812080 A CN 105812080A CN 201410854642 A CN201410854642 A CN 201410854642A CN 105812080 A CN105812080 A CN 105812080A
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Abstract
The invention discloses a radio signal automatic searching device and method and a frequency modulation radio, which belongs to the technical field of automatic station searching. The device comprises a searching unit, a first judging unit which is connected with the searching unit, a frequency point extraction unit which is connected with the first judging unit, a second judging unit which is connected with the frequency point extraction unit, and a recording unit which is connected with the third judging unit. The method comprises the steps that automatic station searching is carried out at frequency interval; frequency points with real stations are judged and added into an effective frequency point list; frequency offset judgment is carried on frequency points in the effective frequency point list, including a frequency point to be detected, a previous frequency point and a next frequency point; judgment of a predetermined number is repeatedly carried out on the frequency points to be detected; the frequency points which are to be detected and do not accord with a judgment condition are deleted; and finally the frequency of the frequency point to be detected in the list is recorded. According to the technical scheme, false stations, stacked stations and mirror image stations are effectively removed; the accuracy of automatic station searching is improved; and the device, the method and the frequency modulation radio have the advantages of simple structure, convenient realization and low cost.
Description
Technical field
The present invention relates to automatic channel search technical field, particularly relate to a kind of automatic searcher of radio signals and method and FM receiver.
Background technology
Automatic channel search is one of indispensable function of FM receiver (FrequencyModulationRadio, FMRadio).Generally before using the FM receiver not yet recording radio station, it is necessary first to open automatic channel search function, to record the frequency in true radio station, thus directly selecting radio station when convenient next time uses.
In prior art, the tuning step-length of FM receiver is generally 100kHz, is required for judging whether the radio signal received on its frequency is a true radio station for each frequency.In prior art, it may be judged whether be that the criterion in true radio station has three, respectively: the power of pilot energy, frequency deviation and antenna end signal.But according to criterion of the prior art, the radio signal received on corresponding frequency is judged, it is easy to can by some false platforms, folded platform or mirror image platform think it is true platform by mistake, thus affecting the accuracy rate of automatic channel search.
Summary of the invention
According to problems of the prior art, namely existing basis for estimation cannot meet the accuracy requirement of automatic channel search, now provides a kind of automatic searcher of radio signals and method and FM receiver, specifically includes:
A kind of automatic searcher of radio signals, it is adaptable in FM receiver, wherein, including:
Search unit a, it is determined that search rate initiateed, and the frequency on fm band is sequentially searched for default frequency interval；
First judging unit, connect described search unit, according to the radio signal received on the frequency that described search unit is being searched for, it is judged that whether described frequency is corresponding to a true radio station, using the described frequency in corresponding described radio station as frequency to be measured, and export corresponding first judged result；
Frequency extraction unit, connects described first judging unit, for extracting the previous adjacent frequency of described frequency to be measured, and the later adjacent frequency of described frequency to be measured；
Second judging unit, connect described frequency extraction unit, for judging whether the relation between the frequency deviation of the later adjacent frequency of the frequency deviation of the previous adjacent frequency of described frequency to be measured, the frequency deviation of described frequency to be measured and described frequency to be measured meets a Rule of judgment preset, and export corresponding second judged result；
Record unit, connects described 3rd judging unit, for according to described 3rd judged result, being recorded in by the frequency described to be measured meeting all Rule of judgment in an effective frequency list.
Preferably, the automatic searcher of this radio signals, wherein, the described Rule of judgment preset includes: the relation between the frequency deviation of the later adjacent frequency of the frequency deviation of the previous adjacent frequency of described frequency to be measured, the frequency deviation of described frequency to be measured and described frequency to be measured meets equation below:
|a1-a0|>3000；
|a2-a1|>3000；
|a0-a2|>9000；
Wherein a1 represents the frequency deviation of described frequency to be measured, and a0 represents the frequency deviation of the previous adjacent frequency of described frequency to be measured, and a2 represents the frequency deviation of the later adjacent frequency of described frequency to be measured.
Preferably, the automatic searcher of this radio signals, wherein, also include:
Counting unit, connects described second judging unit and described record unit respectively, is wherein preset with initial zero-bit and a maximum；
Described counting unit starts counting up from described initial zero-bit, adds 1 after described second judging unit completes the judgement to all frequencies；
Described frequency to be measured is judged when the counting of described counting unit is not up to described maximum and exports described second judged result accordingly by described second judging unit again；
Described label unit is according to described second judged result, delete the frequency described to be measured not meeting described Rule of judgment in described effective frequency list, and the frequency of described frequency to be measured is recorded when the technology of described counting unit reaches described maximum, using the frequency as the true radio station searched.
Preferably, the automatic searcher of this radio signals, wherein, described maximum is 1000.
Preferably, the automatic searcher of this radio signals, wherein, described frequency interval is 50kHz.
A kind of radio signals automatic search method, it is adaptable in FM receiver, wherein, including:
Step S1, it is determined that an initial search rate, and with default frequency interval, the frequency on fm band is sequentially searched for；
Step S2, it is judged that the whether corresponding radio station of radio signal received on the frequency searched, is judged as the described frequency in corresponding described radio station frequency to be measured, and joins in an effective frequency list；
Step S3, it is judged that the frequency deviation of the frequency described to be measured in described effective frequency list, described frequency to be measured the frequency deviation of previous adjacent frequency, and whether the relation between the frequency deviation of the later adjacent frequency of described frequency to be measured meet a Rule of judgment preset；
If being unsatisfactory for described Rule of judgment, then described frequency to be measured is deleted in described effective frequency list；
Step S4, it is judged that whether searched described frequency is last frequency in described fm band；
If searched described frequency is not last frequency in described fm band, then return described step S2, to search for next described frequency；
Step S5, adds 1 to the searching times of described frequency, and judges whether described searching times reaches a maximum preset；
If described searching times is not up to described maximum, then return described step S3；
Step S6, record includes the frequency of the frequency described to be measured in described effective frequency list, using the frequency as the true radio station searched, and exits.
Preferably, this radio signals automatic search method, wherein, in described step S1, described frequency interval is 50kHz.
Preferably, this radio signals automatic search method, wherein, described step S3 specifically includes:
Step S31, extracts the previous adjacent frequency of described frequency to be measured and the later adjacent frequency of described frequency to be measured；
Step S32, judge whether the relation between the frequency deviation of the frequency deviation of described frequency to be measured and the previous adjacent frequency of described frequency to be measured meets a first condition preset, and when being unsatisfactory for described first condition, described frequency to be measured is deleted from described effective frequency list, then switch into described step S4；
Step S33, judge whether the relation between the frequency deviation of the frequency deviation of described frequency to be measured and the later adjacent frequency of described frequency to be measured meets a second condition preset, and when being unsatisfactory for described second condition, described frequency to be measured is deleted from described effective frequency list, then switch into described step S4；
Step S34, it is judged that whether the relation between the frequency deviation of the frequency deviation of the previous adjacent frequency of described frequency to be measured and the later adjacent frequency of described frequency to be measured meets a third condition preset:
If meeting described third condition, go to described step S4；
If being unsatisfactory for described third condition, then described frequency to be measured is deleted from described effective frequency list, and go to described step S4.
Preferably, this radio signals automatic search method, wherein, in described step S32, the described first condition preset is that the relation between the frequency deviation of the frequency deviation of described frequency to be measured and the previous adjacent frequency of described frequency to be measured meets below equation:
|a1-a0|>3000；
Wherein a0 represents the frequency deviation of the previous adjacent frequency of described frequency to be measured, and a1 represents the frequency deviation of described frequency to be measured.
Preferably, this radio signals automatic search method, wherein, in described step S33, the described second condition preset is that the frequency deviation of described frequency to be measured meets below equation:
|a2-a1|>3000；
Wherein a1 represents the frequency deviation of described frequency to be measured, and a2 is the frequency deviation of the later adjacent frequency of described frequency to be measured.
Preferably, this radio signals automatic search method, wherein, in described step S34, the described third condition preset is that the relation between frequency deviation and the frequency deviation of later adjacent frequency of the previous adjacent frequency of described frequency to be measured meets below equation:
|a0-a2|>9000；
Wherein a0 represents the frequency deviation of the previous adjacent frequency of described frequency to be measured, and a2 is the frequency deviation of the later adjacent frequency of described frequency to be measured.
Preferably, this radio signals automatic search method, wherein, in described step S5, the described maximum preset is 1000.
A kind of FM receiver, adopts above-mentioned radio signals automatic search method.
Technique scheme provides the benefit that:
1) effectively remove false platform, folded platform and mirror image platform, improve the accuracy rate of automatic channel search；
2) construct fairly simple, it is achieved very convenient, it is achieved less costly.
Accompanying drawing explanation
Fig. 1 is in the preferred embodiment of the present invention, the structural representation of the automatic searcher of a kind of radio signals；
Fig. 2-3 is in the preferred embodiment of the present invention, the schematic flow sheet of a kind of radio signals automatic search method；
Fig. 4-6 is in the preferred embodiment of the present invention, supports the corresponding coordinate schematic diagram of technical solution of the present invention with data in table 1-3.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
It should be noted that when not conflicting, the embodiment in the present invention and the feature in embodiment can be mutually combined.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
In existing automatic channel search technology, the basis for estimation of employing generally has three: pilot energy, frequency deviation and antenna end signal power.
The standard of above three basis for estimation is as a rule fixing in industry, for instance:
Criterion for frequency deviation is: the absolute value of the frequency deviation of frequency is less than 2000Hz.
Criterion for antenna end signal power is: for power more than-95dBm for tone signal；And for power more than-105dBm for stereophonic signal.
Meet above three basis for estimation only simultaneously, can be considered as just true radio station.
But, the clock method of fractional frequency division is generally adopted due to FM receiver, existing fm band can be brought a lot of spurious signal, under the premise that tuning number of times is limited, so some false platforms are easy to be judged as true platform, therefore only by above three basis for estimation, for instance according to existing frequency deviation according to (absolute value of frequency deviation is less than 2000Hz), it is not enough to remove all of false platform, folded platform and mirror image platform, thus affecting the accuracy of radio automatic channel search.
In the preferred embodiment of the present invention, it is provided that a kind of automatic searcher of radio signals, it is adaptable in FM receiver, its structure is as it is shown in figure 1, specifically include:
Search unit 1；In the preferred embodiment of the present invention, search unit 1 sets the original frequency of a search, for instance 87.0MHz (for China's FM frequency range).In other words, it is possible to start the frequency fm band is scanned for from 87.0MHz.
Further, in the preferred embodiment of the present invention, after determining original frequency, the frequency on fm band, with a frequency interval preset, is scanned for for starting point by above-mentioned search unit 1 with original frequency.In other words, in the preferred embodiment of the present invention, search unit 1, from original frequency, often receives radio signal through a frequency interval preset on the frequency of respective frequencies.
In the preferred embodiment of the present invention, the step-size in search of above-mentioned default frequency interval and search unit 1, for 50kHz.Namely, search unit 1 is with original frequency for starting point, on a frequency, radio signal is received every 50kHz, such as, in the preferred embodiment of the present invention, original frequency is 87.0MHz, then search unit 1 to the frequency at 87.0MHz+50kHz place, the frequency at 87.0MHz+100kHz place, 87.0MHz+150kHz place frequency sequentially scan for, by that analogy, until all frequencies searched on fm band.In other embodiments of the present invention, above-mentioned step-size in search can be set to other length according to specifically needing, for instance 100kHz.
In the preferred embodiment of the present invention, the automatic searcher of above-mentioned radio signals also includes:
First judging unit 2, connects above-mentioned search unit 1, according to some threshold condition, the radio signal that the frequency searched for receives is judged, thus tentatively judging the radio station whether including a correspondence on this frequency.
Further, in the preferred embodiment of the present invention, above-mentioned threshold condition is namely as mentioned above it is possible, pilot energy condition, Frequency Offset and antenna end signal power condition can be included.Specifically, pilot energy condition is the rigid condition in industry, Frequency Offset can be the frequency deviation absolute value on frequency less than 2000Hz, antenna opening power condition can include during monophonic that power is more than-95dBm, and during double track, power is more than-105dBm etc..When above three threshold condition is reached simultaneously, can judge on currently searched frequency there being a true radio station.
But as mentioned above it is possible, such preliminary judgement is likely to not accurate, the clock signal that FM uses can cause that some false platforms, folded platform or mirror image platform are judged as Zhen Tai and are recorded in tune platform list, thus cause the inconvenience in use to user.Therefore, in the preferred embodiment of the present invention, also include in the automatic searcher of above-mentioned radio signals:
Frequency extraction unit 3, connects above-mentioned first judging unit 2.In the preferred embodiment of the present invention, the first judging unit 2 exports corresponding first judged result.Frequency extraction unit 3 is according to this first judged result, the frequency meeting above three threshold condition is judged as frequency to be measured, and extract the previous adjacent frequency of frequency to be measured and the later adjacent frequency of frequency to be measured, to prepare ensuing detection and judge process.
In the preferred embodiment of the present invention, said frequencies interval can be 50kHz, and therefore what frequency extraction unit 3 extracted is the frequency of the front distance 50kHz of frequency to be measured, frequency to be measured, and the frequency of distance 50kHz after frequency to be measured.
In the preferred embodiment of the present invention, the automatic searcher of above-mentioned radio signals also includes:
Second judging unit 4, connects frequency extraction unit 3.In the preferred embodiment of the present invention, the judge process in the second judging unit 4 needs to use the later adjacent frequency of frequency to be measured, the previous adjacent frequency of frequency to be measured and frequency to be measured.
Further, in the preferred embodiment of the present invention, whether the relation that the second judging unit 4 is used for judging between the frequency deviation of the later adjacent frequency of the frequency deviation of the previous adjacent frequency of the frequency deviation of frequency to be measured, frequency to be measured and frequency to be measured meets a Rule of judgment preset, and exports corresponding second judged result.
Further, in the preferred embodiment of the present invention, above-mentioned default Rule of judgment may include that
|a1-a0|>3000；(1)
|a2-a1|>3000；(2)
|a0-a2|>9000；(3)
Wherein a1 represents the frequency deviation of frequency to be measured, and a0 represents the frequency deviation of the previous adjacent frequency of frequency to be measured, and a2 represents the frequency deviation of the later adjacent frequency of frequency to be measured.
In the preferred embodiment of the present invention, the automatic searcher of above-mentioned radio signals also includes:
Record unit 5, connects the second judging unit 4.In the preferred embodiment of the present invention, the record unit 5 second judged result according to output, the frequency to be measured meeting above-mentioned Rule of judgment is charged in an effective frequency list.For duplicate detection.
In the preferred embodiment of the present invention, the automatic searcher of above-mentioned radio signals also includes:
Counting unit 6, connects above-mentioned second judging unit 4 and record unit 5 respectively.In the preferred embodiment of the present invention, counting unit 6 is preset with initial zero-bit and a maximum.
Further, in the preferred embodiment of the present invention, counting from initial zero-bit, after the second judging unit 4 completes the judgement to all frequencies, the counting in counting unit 6 adds 1, until maximum.
In the preferred embodiment of the present invention, after the counting in counting unit 6 adds 1, the frequency to be measured included in effective frequency list is judged by the second judging unit 4 again with default Rule of judgment (i.e. formula 1-3).When need frequency measurement point do not pass through judgement time, record unit 5 this frequency to be measured is deleted from effective frequency list.
In the preferred embodiment of the present invention, when the counting in counting unit 6 increases to maximum, the frequency to be measured now also retained in effective frequency list is considered the frequency in corresponding true radio station.Therefore record unit 6 records the frequency of these frequencies to be measured, the frequency in true radio station during to adjust platform as user.
As in figure 2 it is shown, in the preferred embodiment of the present invention, a kind of radio signals automatic search method, it is adaptable in FM receiver, and utilize the automatic searcher of above-mentioned radio signals, specifically include:
Step S1, it is determined that an initial search rate, and with default frequency interval, the frequency on fm band is sequentially searched for；
In the preferred embodiment of the present invention, initial search rate can by user self-defining, for instance definition 87.0MHz is initial search rate, then automatic channel search process is namely with 87.0MHz for starting point.
In the preferred embodiment of the present invention, the tuning step-length of said frequencies interval and the automatic searcher of radio signals, it is possible to for 50kHz.In other words, in the preferred embodiment of the present invention, from 87.0MHz,
Step S2, it is judged that the whether corresponding radio station of radio signal received on the frequency searched, is judged as frequency to be measured by the frequency in corresponding radio station, and joins in an effective frequency list；
In the preferred embodiment of the present invention, the basis for estimation of above-mentioned judge process can be three: the power of pilot energy, frequency deviation and antenna end signal.
Further, in the preferred embodiment of the present invention, pilot energy is the fixed standard in industry；The standard of frequency deviation can be that frequency deviation absolute value is less than 2000Hz；The standard of antenna opening power can be: for monophonic, for power more than-95dBm, for stereo, for power more than-105dBm.
In the preferred embodiment of the present invention, when meeting above three basis for estimation simultaneously, it is believed that this frequency corresponds to a true radio station, and is charged in an effective frequency list as frequency to be measured by this frequency.
In the preferred embodiment of the present invention, the above-mentioned judgement for true radio station is only preliminary judgement, is judged as frequency to be measured by some frequencies, to prepare next step judgement.
Step S3, it is judged that whether the effectively frequency deviation of the previous adjacent frequency of the frequency deviation of frequency to be measured in frequency list, frequency to be measured, and the relation between the frequency deviation of the later adjacent frequency of frequency to be measured meets a Rule of judgment preset；
If being unsatisfactory for Rule of judgment, then frequency to be measured is deleted in effective frequency list；
In the preferred embodiment of the present invention, (tentatively judge on this frequency there being a true radio station) when searching a frequency and being frequency to be measured, namely start following judgement:
First the previous adjacent frequency of this frequency to be measured, this frequency to be measured and the later adjacent frequency of this frequency to be measured are extracted.
Subsequently, frequency deviation for the frequency deviation of this frequency to be measured, the previous adjacent frequency of this frequency to be measured, and the frequency deviation of the later adjacent frequency of this frequency to be measured, it is judged that the relation between three search no meet one preset Rule of judgment (this Rule of judgment can describe in detail hereinafter).And the frequency to be measured not meeting default Rule of judgment is removed from above-mentioned effective frequency list.
Further, in the preferred embodiment of the present invention, above-mentioned judgement for frequency to be measured be positioned at effective frequency list, namely above-mentioned judgement be effective frequency list record frequency point ranges in carry out.
Further, in the preferred embodiment of the present invention, sequentially judging equally for frequency to be measured, namely order judges to include the frequency to be measured in effective frequency list, all judges for including the frequency to be measured in effective frequency list.
Step S4, it is judged that whether searched frequency is last frequency in fm band；
If searched frequency is not last frequency in fm band, then return step S2, to search for next frequency；
In the preferred embodiment of the present invention, the process of above-mentioned steps S4 is in that to have judged whether the search to whole fm band.
Step S5, adds 1 to the searching times of frequency, and judges whether searching times reaches a maximum preset；
If searching times is not up to maximum, then return step S3；
In the preferred embodiment of the present invention, above-mentioned maximum can be 1000, and namely the maximum of searching times is 1000 times, it is also possible to the number of times freely set for other user such as 80 times.
In the preferred embodiment of the present invention, the effect of the setting of above-mentioned searching times is in that: control be pointed in effective frequency list frequency to be measured do repeatedly repeat judge, owing to the frequency deviation on frequency may not stop change, therefore after repeating judgement every time, it is likely to delete some frequencies to be measured from effective frequency list, to form new effective frequency list, that then treats frequency measurement point each time repeats judgement, and it judges that object is the frequency to be measured that the last new effective frequency list judging to be subsequently formed includes.
Step S6, record includes the frequency of the frequency to be measured in effective frequency list, using the frequency as the true radio station searched, and exits.
In the preferred embodiment of the present invention, when searching times reaches maximum, now think repeat judge number of times enough, the radio station corresponding to frequency to be measured that effective frequency list now includes be all through detection true radio station.Therefore the frequency of these frequencies to be measured is recorded, using the frequency as the true radio station searched, with the whole automatic channel search process of backed off after random.
In the preferred embodiment of the present invention, as it is shown on figure 3, above-mentioned steps S3 specifically includes:
Step S31, extracts the previous adjacent frequency of frequency to be measured and the later adjacent frequency of frequency to be measured；
Step S32, it is judged that whether the relation between the frequency deviation of the frequency deviation of frequency to be measured and the previous adjacent frequency of frequency to be measured meets a first condition preset, and is deleted from effective frequency list by frequency to be measured when being unsatisfactory for first condition, then switches into step S4；
Step S33, it is judged that whether the frequency deviation of frequency to be measured meets a second condition preset, and is deleted from effective frequency list by frequency to be measured when being unsatisfactory for second condition, then switches into step S4；
Step S34, it is judged that whether the relation between the frequency deviation of the frequency deviation of frequency to be measured and the later adjacent frequency of frequency to be measured meets a third condition preset:
If meeting third condition, go to step S4；
If being unsatisfactory for third condition, then frequency to be measured is deleted from effective frequency list, and go to step S4.
In the preferred embodiment of the present invention, namely said process shows, the Rule of judgment preset is effectively divided into three conditions, i.e. first condition, second condition and third condition.
Further, in the preferred embodiment of the present invention, above-mentioned first condition is for meeting formula (1), and second condition is for meeting formula (2), and third condition is for meeting formula (3).
Further, in the preferred embodiment of the present invention, it is necessary to meet above three condition, as long as i.e. one of them condition not met, namely it is considered as undesirable frequency to be measured simultaneously, and is deleted from effective frequency list.
In sum, it is an object of the invention to, carry out automatic channel search with predetermined frequency interval, and tentatively judge the frequency with true platform, add in effective frequency list.Being repeated judging subsequently for the frequency in effective frequency list, all judge whether it meets predetermined frequency deviation relation condition every time, if not meeting, deleting from effective frequency list.After several times repeat to judge, using the frequency that is also retained in effective frequency list as the frequency with true platform, and record the true platform frequency that its frequency obtains as automatic channel search.
There is provided the experimental data in table 1 below-3 as the evidence to technique scheme:
In table 1, true radio station " 103.7MHz " is carried out data grabber and calculates frequency deviation data, and the corresponding data above-mentioned formula of substitution (1) are calculated in (3)；
In table 2, true radio station " 106.5MHz " is carried out data grabber and calculates frequency deviation data, and the corresponding data above-mentioned formula of substitution (1) are calculated in (3)；
In table 3, false platform " 95.7MHz " is carried out data grabber and calculates frequency deviation data, and the corresponding data above-mentioned formula of substitution (1) are calculated in (3)；
Table 1
Fig. 4 show the coordinate schematic diagram of corresponding table 1.
Table 2
Fig. 5 is the coordinate schematic diagram of corresponding table 2.
Table 3
Fig. 6 is the coordinate schematic diagram of corresponding table 3.
Then can find out from upper table 1-3:
1) frequency deviation described in frequency deviation data fit technical solution of the present invention as shown in Table 1 and Table 2, captured between two true radio station judges thresholding (three namely the above threshold condition)；
2) experimental data in table 3 shows, false platform cannot simultaneously by the judgement of above three threshold condition.
Therefore above-mentioned data can support technical scheme.
In the preferred embodiment of the present invention, also include a kind of FM receiver, including the automatic searcher of above-mentioned radio signals.
In the preferred embodiment of the present invention, also include a kind of FM receiver, wherein adopt above-mentioned radio signals automatic search method.
The foregoing is only preferred embodiment of the present invention; not thereby restriction embodiments of the present invention and protection domain; to those skilled in the art; the equivalent replacement done by all utilizations description of the present invention and diagramatic content and the obtained scheme of apparent change should be can appreciate that, all should be included in protection scope of the present invention.
Claims (14)
1. the automatic searcher of radio signals, it is adaptable in FM receiver, it is characterised in that including:
Search unit a, it is determined that search rate initiateed, and the frequency on fm band is sequentially searched for default frequency interval；
First judging unit, connect described search unit, according to the radio signal received on the frequency that described search unit is being searched for, it is judged that whether described frequency is corresponding to a radio station, using the described frequency in corresponding described radio station as frequency to be measured, and export corresponding first judged result；
Frequency extraction unit, connects described first judging unit, for extracting the previous adjacent frequency of described frequency to be measured, and the later adjacent frequency of described frequency to be measured；
Second judging unit, connect described frequency extraction unit, for judging whether the relation between the frequency deviation of the later adjacent frequency of the frequency deviation of the previous adjacent frequency of described frequency to be measured, the frequency deviation of described frequency to be measured and described frequency to be measured meets a Rule of judgment preset, and export corresponding second judged result；
Record unit, connects described 3rd judging unit, for according to described 3rd judged result, being recorded in by the frequency described to be measured meeting described Rule of judgment in an effective frequency list.
2. the automatic searcher of radio signals as claimed in claim 1, it is characterized in that, the described Rule of judgment preset includes: the relation between the frequency deviation of the later adjacent frequency of the frequency deviation of the previous adjacent frequency of described frequency to be measured, the frequency deviation of described frequency to be measured and described frequency to be measured meets equation below:
|a1-a0|>3000；
|a2-a1|>3000；
|a0-a2|>9000；
Wherein a1 represents the frequency deviation of described frequency to be measured, and a0 represents the frequency deviation of the previous adjacent frequency of described frequency to be measured, and a2 represents the frequency deviation of the later adjacent frequency of described frequency to be measured.
3. the automatic searcher of radio signals as claimed in claim 1, it is characterised in that also include:
Counting unit, connects described second judging unit and described record unit respectively, is wherein preset with initial zero-bit and a maximum；
Described counting unit starts counting up from described initial zero-bit, adds 1 after described second judging unit completes the judgement to all frequencies；
Described frequency to be measured is judged when the counting of described counting unit is not up to described maximum and exports described second judged result accordingly by described second judging unit again；
Described label unit is according to described second judged result, delete the frequency described to be measured not meeting described Rule of judgment in described effective frequency list, and the frequency of described frequency to be measured is recorded when the technology of described counting unit reaches described maximum, using the frequency as the true radio station searched.
4. the automatic searcher of radio signals as claimed in claim 3, it is characterised in that described maximum is 1000.
5. the automatic searcher of radio signals as claimed in claim 1, it is characterised in that described frequency interval is 50kHz.
6. a radio signals automatic search method, it is adaptable in FM receiver, it is characterised in that including:
Step S1, it is determined that an initial search rate, and with default frequency interval, the frequency on fm band is sequentially searched for；
Step S2, it is judged that the whether corresponding radio station of radio signal received on the frequency searched, is judged as the described frequency in corresponding described radio station frequency to be measured, and joins in an effective frequency list；
Step S3, it is judged that the frequency deviation of the frequency described to be measured in described effective frequency list, described frequency to be measured the frequency deviation of previous adjacent frequency, and whether the relation between the frequency deviation of the later adjacent frequency of described frequency to be measured meet a Rule of judgment preset；
If being unsatisfactory for described Rule of judgment, then described frequency to be measured is deleted in described effective frequency list；
Step S4, it is judged that whether searched described frequency is last frequency in described fm band；
If searched described frequency is not last frequency in described fm band, then return described step S2, to search for next described frequency；
Step S5, adds 1 to the searching times of described frequency, and judges whether described searching times reaches a maximum preset；
If described searching times is not up to described maximum, then return described step S3；
Step S6, record includes the frequency of the frequency described to be measured in described effective frequency list, using the frequency as the true radio station searched, and exits.
7. radio signals automatic search method as claimed in claim 6, it is characterised in that in described step S1, described frequency interval is 50kHz.
8. radio signals automatic search method as claimed in claim 6, it is characterised in that described step S3 specifically includes:
Step S31, extracts the previous adjacent frequency of described frequency to be measured and the later adjacent frequency of described frequency to be measured；
Step S32, judge whether the relation between the frequency deviation of the frequency deviation of described frequency to be measured and the previous adjacent frequency of described frequency to be measured meets a first condition preset, and when being unsatisfactory for described first condition, described frequency to be measured is deleted from described effective frequency list, then switch into described step S4；
Step S33, it is judged that whether the frequency deviation of described frequency to be measured meets a second condition preset, and is deleted from described effective frequency list by described frequency to be measured when being unsatisfactory for described second condition, then switches into described step S4；
Step S34, it is judged that whether the relation between the frequency deviation of the frequency deviation of described frequency to be measured and the later adjacent frequency of described frequency to be measured meets a third condition preset:
If meeting described third condition, go to described step S4；
If being unsatisfactory for described third condition, then described frequency to be measured is deleted from described effective frequency list, and go to described step S4.
9. radio signals automatic search method as claimed in claim 8, it is characterized in that, in described step S32, the described first condition preset is that the relation between the frequency deviation of the frequency deviation of described frequency to be measured and the previous adjacent frequency of described frequency to be measured meets below equation:
|a1-a0|>3000；
Wherein a0 represents the frequency deviation of the previous adjacent frequency of described frequency to be measured, and a1 represents the frequency deviation of described frequency to be measured.
10. radio signals automatic search method as claimed in claim 8, it is characterised in that in described step S33, the described second condition preset is that the frequency deviation of described frequency to be measured meets below equation:
|a2-a1|>3000；
Wherein a1 is the frequency deviation of described frequency to be measured, and a2 is the frequency deviation of the later adjacent frequency of described frequency to be measured.
11. radio signals automatic search method as claimed in claim 8, it is characterised in that in described step S34, the described third condition preset is that the relation between frequency deviation and the frequency deviation of later adjacent frequency of described frequency to be measured meets below equation:
|a0-a2|>9000；
Wherein a0 represents the frequency deviation of the previous adjacent frequency of described frequency to be measured, and a2 is the frequency deviation of the later adjacent frequency of described frequency to be measured.
12. radio signals automatic search method as claimed in claim 6, it is characterised in that in described step S5, the described maximum preset is 1000.
13. a FM receiver, it is characterised in that include the automatic searcher of the radio signals as described in claim 1-5.
14. a FM receiver, it is characterised in that adopt the radio signals automatic search method as described in claim 6-12.
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