CN106130544B - Automatic frequency band calibration method and system - Google Patents
Automatic frequency band calibration method and system Download PDFInfo
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- CN106130544B CN106130544B CN201610423001.6A CN201610423001A CN106130544B CN 106130544 B CN106130544 B CN 106130544B CN 201610423001 A CN201610423001 A CN 201610423001A CN 106130544 B CN106130544 B CN 106130544B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Abstract
The invention provides an automatic frequency band calibration method, which comprises the steps of detecting a signal generating circuit to obtain a first frequency of the signal generating circuit in a current frequency band and executing a frequency band selection program. The band selection procedure comprises the steps of judging whether a target frequency is included between the first frequency and a second frequency of a previous frequency band of the signal generation circuit; the band selection procedure further includes a band decision procedure if the target frequency is included between the first frequency and the second frequency. The band determination procedure comprises obtaining a first and a second frequency difference between the first and the second frequencies and the target frequency; setting the current frequency band as the operating frequency band of the signal generating circuit if the first frequency difference value is smaller than the second frequency difference value; if the first frequency difference is larger than the second frequency difference, the previous frequency band is set as the operating frequency band of the signal generating circuit.
Description
Technical Field
The present invention relates to a method for band calibration, and more particularly, to an automatic band calibration method applied in multi-band technology.
Background
Generally, the signal generating circuit can generate signals with different frequencies according to different setting values. Compared with a signal generating circuit supporting only a single frequency band, a signal generating circuit supporting multiple frequency bands can have more flexibility in circuit application and design. On the other hand, since a signal generating circuit having a plurality of frequency bands needs to select an appropriate frequency band to generate an output signal having a desired frequency during operation, the operation of selecting a frequency band is important for the signal generating circuit. If the selection of the frequency band is not accurate, the overall operation performance of the signal generating circuit is reduced. Therefore, there is a need for an automatic band calibration method and system to ensure the correctness of the band selection operation.
Disclosure of Invention
The invention provides an automatic frequency band calibration method, which is suitable for a signal generating circuit, wherein the signal generating circuit can select among a plurality of frequency bands to generate signals with required frequencies in the selected frequency bands. The automatic frequency band calibration method comprises detecting the signal generating circuit to obtain a first frequency of the current frequency band selected by the signal generating circuit; and performing a band selection procedure. The band selection procedure comprises judging whether a target frequency is included between the first frequency and a second frequency of a previous frequency band selected by the signal generation circuit at the previous time; if the target frequency is included between the first frequency and the second frequency, the band selection procedure further includes a band determination procedure. The band determination procedure comprises obtaining a first frequency difference between the first frequency and the target frequency, and obtaining a second frequency difference between the second frequency and the target frequency; judging whether the first frequency difference value is smaller than the second frequency difference value; setting the current frequency band as an operating frequency band of the signal generating circuit if the first frequency difference is smaller than the second frequency difference; if the first frequency difference is greater than the second frequency difference, the previous frequency band is set as the operating frequency band of the signal generating circuit.
The invention provides an automatic frequency band calibration system, which comprises a signal generating circuit, a frequency band calibration circuit and a frequency band calibration circuit, wherein the signal generating circuit is used for providing a plurality of frequency bands; and an automatic band calibration circuit. The automatic frequency band calibration circuit comprises a counter circuit and a processor circuit. The counter circuit detects the signal generating circuit to obtain a first frequency of the signal generating circuit in a current frequency band selected currently and a second frequency of the signal generating circuit in a previous frequency band selected previously. The processor circuit judges whether a target frequency is included between the first frequency and the second frequency; if the target frequency is included between the first frequency and the second frequency, the processor circuit generates a first frequency difference between the first frequency and the target frequency and generates a second frequency difference between the second frequency and the target frequency. Wherein the processor circuit determines whether the first frequency difference is less than the second frequency difference; if the first frequency difference is smaller than the second frequency difference, the processor circuit sets the current frequency band as an operating frequency band of the signal generating circuit; the processor circuit sets the previous frequency band as the operating frequency band of the signal generating circuit if the first frequency difference is greater than the second frequency difference.
Drawings
FIGS. 1A-1 and 1A-2 are flow charts of an automatic band calibration method according to an embodiment of the invention.
FIG. 1B is a diagram illustrating a plurality of frequency bands of a signal generating circuit according to an embodiment of the invention.
Fig. 2A and 2B are flowcharts of an automatic band calibration method according to an embodiment of the invention.
Fig. 3 is a diagram of an automatic band calibration system according to an embodiment of the invention.
Fig. 4 is a diagram of an automatic band calibration system according to an embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.
FIGS. 1A-1 and 1A-2 are flow diagrams of an automatic band calibration method 100 according to an embodiment of the invention. The automatic band calibration method 100 may be used in a signal generation circuit; the signal generating circuit has a plurality of frequency bands and can generate a desired frequency in a selected frequency band. The automatic band calibration method 100 includes a step 101 and a band selection process 100a, and starts at the step 101. In step 101, the automatic band calibration method 100 performs a detection operation on the signal generating circuit to obtain a first frequency of the signal generating circuit, wherein the first frequency is a frequency of the signal generating circuit in a currently selected current band. After completion of step 101, the automatic band calibration method 100 proceeds to step 102 of the band selection routine 100 a.
The band selection process 100a includes the steps 102, a band determination process 100b and a band adjustment process 100 c. In step 102, the automatic band calibration method 100 determines whether the first frequency and a second frequency of a previous frequency band selected by the signal generating circuit at the previous time contain a target frequency. Wherein the target frequency is a frequency that the signal generation circuit is expected to output. If the target frequency is included between the first frequency and the second frequency, the automatic band calibration method 100 performs step 103 of the band decision process 100 b. In step 103, the automatic band calibration method 100 obtains a first frequency difference between the first frequency and the target frequency, and obtains a second frequency difference between the second frequency and the target frequency; the flow proceeds to step 104. In step 104, the automatic band calibration method 100 determines whether the first frequency difference value is smaller than the second frequency difference value. If the first frequency difference is less than the second frequency difference, the process proceeds to step 1051; if the first frequency difference is greater than the second frequency difference, flow proceeds to step 1052. In step 1051, the automatic band calibration method 100 sets the current frequency band as an operating frequency band of the signal generation circuit; wherein the signal generating circuit operates in the operating frequency band and generates the target frequency. In step 1052, the automatic band calibration method 100 sets the previous frequency band as the operating frequency band of the signal generation circuit.
Based on the above operations, step 101 to step 1051 or step 101 to step 1052, the automatic band calibration method 100 may select the frequency band having the smallest frequency difference with the target frequency between two frequency bands adjacent to the target frequency. Therefore, the automatic band calibration method 100 can accurately select an appropriate frequency band as the operating frequency band, thereby improving the operating performance of the signal generating circuit.
Referring back to step 102, if the target frequency is not included between the first frequency and the second frequency, the automatic band calibration method 100 performs step 106 of the band selection procedure 100 c. In step 106, the automatic band calibration method 100 determines whether the first frequency is greater than the target frequency. If the first frequency is greater than the target frequency, the process proceeds to step 107; if the first frequency is less than the target frequency, the process proceeds to step 109.
In step 107, the automatic frequency band calibration method 100 determines whether the current frequency band is the lowest frequency band having the lowest frequency among the frequency bands of the signal generation circuit. If the current band is the lowest band, the flow proceeds to step 103 of band decision routine 100 b; if the current frequency band is not the lowest frequency band, the flow proceeds to step 108. In step 108, the automatic band calibration method 100 sets a primary low frequency band of the signal generation circuit, which includes lower frequencies and is adjacent to the current frequency band, as the current frequency band, and returns the process to step 101.
In step 109, the automatic band calibration method 100 determines whether the current frequency band is the highest frequency band of the frequency bands of the signal generation circuit having the highest frequency. If the current band is the highest band, the flow proceeds to step 103 of the band decision routine 100 b; if the current band is not the highest band, flow proceeds to step 110. In step 110, the automatic band calibration method 100 sets a primary high frequency band of the signal generation circuit, which includes higher frequencies and is adjacent to the current frequency band, as the current frequency band, and returns the process to step 101.
Based on the operation of the band selection process 100c, the automatic band calibration method 100 can automatically approach a frequency of the band selected by the signal generation circuit to the target frequency; the frequency band having the smallest frequency difference from the target frequency (e.g., the highest frequency band or the lowest frequency band) may also be selected in case the target frequency is not included between the first frequency and the second frequency, thereby ensuring the operating performance of the signal generating circuit.
FIG. 1B is a diagram of a plurality of frequency bands of a signal generating circuit according to an embodiment of the invention. In this embodiment, the signal generating circuit can generate the frequency band B1-B4The signal generating circuit can generate different frequencies in each frequency band according to different set values (e.g. voltage values). In this embodiment, the highest frequency and the lowest frequency generated by the signal generating circuit are the highest frequency FmaxAnd the lowest frequency Fmin(ii) a Wherein, has the highest frequency FmaxFrequency band B of1Is the highest frequency band of the signal generating circuit; and has the lowest frequency FminFrequency band B of4Is the lowest frequency band of the signal generating circuit.
In one embodiment, the signals of FIG. 1BThe current frequency band of the generating circuit is frequency band B3(ii) a The previous sub-band being band B4(ii) a And the target frequency is the target frequency Ft. In this embodiment, the signal generation circuit is in band B1-B4In selecting band B1-B4Respective intermediate frequency Fm1-Fm4The automatic band calibration method 100 is performed. Referring to the automatic band calibration method 100 shown in FIGS. 1A-1 and 1A-2, the automatic band calibration method 100 detects the signal generating circuit of FIG. 1B to obtain the band B3Intermediate frequency F ofm3(i.e., the first frequency), as in step 101. Next, the automatic band alignment method 100 determines the band B of the signal generation circuit of FIG. 1B3Intermediate frequency F ofm3And band B4Intermediate frequency F ofm4Whether or not the target frequency F is includedt(step 102). Due to the intermediate frequency Fm3And intermediate frequency Fm4Does not include the target frequency FtThe automatic band alignment method 100 further determines the band B of the signal generation circuit of FIG. 1B3Intermediate frequency F ofm3Whether or not less than the target frequency Ft(as in step 106). Next, the automatic band alignment method 100 determines the band B of the signal generation circuit of FIG. 1B3Intermediate frequency F ofm3Less than the target frequency FtThen, the frequency band B is judged3Whether it is the highest frequency band of the signal generating circuit of fig. 1B (step 109). In the judgment band B3Not after the highest frequency band of the signal generating circuit of fig. 1B (the highest frequency band in this embodiment is frequency band B)1) Automatic band calibration method 100 frequency band B of the signal generation circuit of FIG. 1B2The current frequency band is set (as in step 110) and the automatic band calibration method 100 is re-executed (beginning with step 101).
Continuing with the above embodiment, the current frequency band of the signal generating circuit of FIG. 1B is frequency band B2(ii) a The previous sub-band is band B3(ii) a And the target frequency is a target frequency Ft. Automatic band calibration method 100 detects band B2Intermediate frequency F ofm2(i.e., the first frequency), as in step 101. Then, theThe automatic band alignment method 100 determines the band B of the signal generation circuit of FIG. 1B2Intermediate frequency F ofm2And band B3Intermediate frequency F ofm3Whether or not the target frequency F is includedt(step 102). Due to the intermediate frequency Fm2And intermediate frequency Fm3Between target frequency FtThe automatic band calibration method 100 obtains the intermediate frequency Fm2With a target frequency FtAnd obtaining the intermediate frequency Fm3With a target frequency FtA second frequency difference (step 103). Then, the automatic band calibration method 100 determines whether the first frequency difference is smaller than the second frequency difference (step 104). In this embodiment, since the first frequency difference is smaller than the second frequency difference (as shown in FIG. 1B), the automatic band calibration method 100 will adjust the frequency band B2The operating frequency band of the signal generating circuit of fig. 1B is set (step 105).
In some embodiments, the signal generation circuit may be in band B1-B4Each selecting a frequency to perform the automatic band calibration method 100. In some embodiments, the signal generation circuit may support a number of frequency bands greater than two.
Referring to the contents shown in FIG. 1B, band B1-B4Intermediate frequency F ofm1-Fm4And the frequency range of the signal generating circuit (i.e., frequency F)minTo frequency FmaxFrequency range of) intermediate frequency FrmWith the smallest difference in frequency being the intermediate frequency Fm2. In some embodiments, the signal generating circuit of FIG. 1B selects the intermediate frequency F of the signal generating circuit of FIG. 1B when the frequency band is selected for the first timermIntermediate frequency F with minimum frequency differencem2Associated frequency band B2。
Fig. 2A-2B are flow diagrams of a method 200 for automatic band alignment according to an embodiment of the invention. The difference between the automatic band calibration method 200 and the automatic band calibration method 100 is in step 201, and step 201 is performed before the automatic band calibration method 200 determines whether the target frequency is included between the first frequency and the second frequency. Referring to the contents of FIGS. 1A-1, 1A-2, and 2A-2B, in step 201, the automatic band calibration method 200 determines whether the number of detections by the signal generation circuit is greater than or equal to two. If the number of detections is greater than or equal to two, then the automatic band calibration method 200 performs a band selection procedure 100 a; if the number of detections is less than two, the automatic band calibration method 200 proceeds directly to step 106 of the band adjustment procedure 100 c. In this embodiment, the automatic band calibration method 200 detects the signal producing circuit for the first time, the current frequency band is not the highest frequency band or the lowest frequency band.
Fig. 3 is a diagram of an automatic band calibration system 300 according to an embodiment of the invention. The automatic band calibration method 100 and the automatic band calibration method 200 may be performed by an automatic band calibration circuit 302 of an automatic band calibration system 300. The automatic band calibration system 300 includes a voltage controlled oscillator circuit 301 and an automatic band calibration circuit 302. The automatic band calibration circuit 302 includes a counter circuit 303 and a processor circuit 304. In some embodiments, the counter circuit 303 may detect the vco 301, so as to obtain a first frequency of the vco 301 in the current frequency band selected currently and a second frequency of the previous frequency band selected previously. The processor circuit 304 can determine whether a target frequency is included between the first frequency and the second frequency. If the target frequency is included between the first frequency and the second frequency, the processor circuit 304 may generate a first frequency difference between the first frequency and the target frequency and generate a second frequency difference between the second frequency and the target frequency. Processor circuit 304 may determine whether the first frequency difference value is less than the second frequency difference value. If processor circuit 304 determines that the first frequency difference is less than the second frequency difference, processor circuit 304 sets the current frequency band to an operating frequency band of vco circuit 301; conversely, if the first frequency difference value is greater than the second frequency difference value, the processor circuit 304 sets the previous frequency band as the operating frequency band of the voltage-controlled oscillation circuit 301.
Fig. 4 is a diagram of an automatic band calibration system 400 according to an embodiment of the invention. The automatic band calibration method 100 and the automatic band calibration method 200 may be performed by an automatic band calibration circuit 406 of the automatic band calibration system 400. The automatic band calibration system 400 includes an automatic band calibration circuit 406 and a signal generation circuit 409. In some embodiments, the signal generating circuit 409 may be a phase locked loop, but the invention is not limited thereto. The automatic band calibration circuit 406 includes a counter circuit 407 and a processor circuit 408; the signal generating circuit 409 includes a phase frequency detecting circuit 401, a charge pump 402, a filter circuit 403, a voltage controlled oscillator circuit 404, and a frequency divider circuit 405. In some embodiments, the counter circuit 407 may detect a reference frequency of the reference signal FR and the vco circuit 404, and obtain a first frequency of the vco circuit 404 in the current frequency band selected currently and a second frequency of the previous frequency band selected previously. The processor circuit 408 may determine whether a target frequency is included between the first frequency and the second frequency; wherein the target frequency is set by the reference signal FR and the frequency divider circuit 405. If the target frequency is included between the first frequency and the second frequency, the processor circuit 408 may generate a first frequency difference between the first frequency and the target frequency and generate a second frequency difference between the second frequency and the target frequency. Processor circuit 408 may determine whether the first frequency difference value is less than the second frequency difference value. If the processor circuit 408 determines that the first frequency difference is smaller than the second frequency difference, the processor circuit 408 sets the current frequency band as an operating frequency band of the signal generating circuit 409; conversely, if the first frequency difference is greater than the second frequency difference, the processor circuit 304 sets the previous frequency band as the operating frequency band of the signal generation circuit 409.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (12)
1. An automatic frequency band calibration method for a signal generating circuit for selecting between a plurality of frequency bands to generate a signal of a desired frequency in the selected frequency band, comprising:
detecting the signal generating circuit to obtain a first frequency of the current frequency band currently selected by the signal generating circuit; and
executing a band selection procedure;
wherein the band selection procedure comprises:
judging whether the first frequency and a second frequency of a previous frequency band selected by the signal generating circuit at the previous time contain a target frequency; and
when the target frequency is included between the first frequency and the second frequency, the band selection procedure further includes a band determination procedure, and the band determination procedure includes:
obtaining a first frequency difference between the first frequency and the target frequency, and obtaining a second frequency difference between the second frequency and the target frequency;
judging whether the first frequency difference value is smaller than the second frequency difference value;
setting the current frequency band as an operating frequency band in which the signal generating circuit operates to generate the signal having the target frequency when the first frequency difference is smaller than the second frequency difference; and
setting the previous frequency band as the operating frequency band of the signal generating circuit when the first frequency difference is greater than the second frequency difference,
wherein the first frequency and the second frequency are both generated by the signal generation circuit according to a voltage set value corresponding to an intermediate frequency of the plurality of frequency bands, and the target frequency is a frequency that the signal generation circuit is expected to output in the set operation frequency band.
2. The automatic band calibration method of claim 1, wherein the band selection procedure further comprises:
when the target frequency is not included between the first frequency and the second frequency, the band selection procedure further includes a band adjustment procedure, and the band adjustment procedure includes:
judging whether the first frequency is greater than the target frequency;
when the first frequency is greater than the target frequency, the band adjustment procedure further includes:
judging whether the current frequency band is the lowest frequency band with the lowest frequency in the frequency bands;
when the current band is the lowest band, the band selection procedure executes the band determination procedure;
when the current band is not the lowest band, the band adjustment procedure further includes:
setting a sub-low frequency band of the signal generating circuit, which includes lower frequencies and is adjacent to the current frequency band, as the current frequency band;
the automatic band calibration method is re-executed.
3. The automatic band calibration method of claim 2, wherein the band adjustment procedure further comprises:
when the first frequency is less than the target frequency, the band adjustment procedure further includes:
judging whether the current frequency band is the highest frequency band with the highest frequency in the frequency bands;
when the current band is the highest band, the band selection procedure executes the band determination procedure;
when the current band is not the highest band, the band adjustment procedure further comprises:
setting a sub-high frequency band of the signal generating circuit, which includes higher frequencies and is adjacent to the current frequency band, as the current frequency band;
the automatic band calibration method is re-executed.
4. The automatic frequency band calibration method of claim 3, wherein said first frequency is a middle frequency of said current frequency band;
wherein the second frequency is a middle frequency of the previous sub-band.
5. The automatic frequency band calibration method of claim 3, wherein the middle frequency of the current frequency band and the middle frequency of the frequency range of the signal generation circuit have the smallest frequency difference when the signal generation circuit is first detected.
6. The method of claim 5, wherein prior to determining whether the target frequency is included between the first frequency and the second frequency, the method further comprises:
judging whether the detection times of the signal generating circuit are more than or equal to two;
when the detection times is more than or equal to two, executing the frequency band selection program;
when the detection times is less than two, the frequency band adjustment program is directly executed;
wherein, when the signal generating circuit is detected for the first time, the current frequency band is not the highest frequency band or the lowest frequency band.
7. An automatic band calibration system, comprising:
a signal generating circuit providing a plurality of frequency bands; and
an automatic band calibration circuit comprising:
a counter circuit; and
a processor circuit;
wherein the counter circuit detects the signal generating circuit to obtain a first frequency of the current frequency band currently selected by the signal generating circuit and a second frequency of the previous frequency band previously selected by the signal generating circuit, the processor circuit determines whether a target frequency is included between the first frequency and the second frequency by a band determining procedure,
when the target frequency is included between the first frequency and the second frequency, the processor circuit generates a first frequency difference value between the first frequency and the target frequency and generates a second frequency difference value between the second frequency and the target frequency;
wherein the processor circuit determines whether the first frequency difference is less than the second frequency difference;
when the first frequency difference is smaller than the second frequency difference, the processor circuit sets the current frequency band as an operating frequency band in which the signal generating circuit operates to generate the signal having the target frequency;
when the first frequency difference is larger than the second frequency difference, the processor circuit sets the previous frequency band as the operating frequency band of the signal generating circuit,
wherein the first frequency and the second frequency are both generated by the signal generation circuit according to a voltage set value corresponding to an intermediate frequency of the plurality of frequency bands, and the target frequency is a frequency that the signal generation circuit is expected to output in the set operation frequency band.
8. The automatic band calibration system of claim 7, wherein the automatic band calibration system further comprises:
when the target frequency is not included between the first frequency and the second frequency, the automatic band calibration circuit further includes a band adjuster, the band adjuster including:
judging whether the first frequency is greater than the target frequency;
when the first frequency is greater than the target frequency, the band adjuster further includes:
judging whether the current frequency band is the lowest frequency band with the lowest frequency in the frequency bands;
when the current frequency band is the lowest frequency band, the counter circuit executes the frequency band determination procedure;
when the current frequency band is not the lowest frequency band, the band adjuster further includes:
setting a sub-low frequency band of the signal generating circuit, which includes a lower frequency and is adjacent to the current frequency band, as the current frequency band.
9. The automatic band calibration system of claim 8, wherein the band adjuster further comprises:
when the first frequency is less than the target frequency, the band adjuster further comprises:
judging whether the current frequency band is the highest frequency band with the highest frequency in the frequency bands;
when the current frequency band is the highest frequency band, the counter circuit executes the frequency band determination procedure;
when the current frequency band is not the highest frequency band, the band adjuster further includes:
setting a sub-high frequency band of the signal generating circuit, which includes a higher frequency and is adjacent to the current frequency band, as the current frequency band.
10. The automatic band calibration system of claim 9, wherein said first frequency is a middle frequency of said current band;
wherein the second frequency is a middle frequency of the previous sub-band.
11. The automatic band calibration system of claim 9, wherein the middle frequency of the current band and the middle frequency of the frequency range of the signal generation circuit have the smallest frequency difference when the signal generation circuit is first detected.
12. The automatic band calibration system of claim 11, wherein prior to determining whether the target frequency is included between the first frequency and the second frequency, the automatic band calibration system further comprises:
judging whether the detection times of the signal generating circuit are more than or equal to two;
when the detection times are more than or equal to two, the counter circuit executes;
when the detection times are less than two, the frequency band adjuster executes;
wherein, when the signal generating circuit is detected for the first time, the current frequency band is not the highest frequency band or the lowest frequency band.
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