CN113316224B - Broadcast channel searching method, apparatus, device terminal and storage medium - Google Patents
Broadcast channel searching method, apparatus, device terminal and storage medium Download PDFInfo
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- CN113316224B CN113316224B CN202110504135.1A CN202110504135A CN113316224B CN 113316224 B CN113316224 B CN 113316224B CN 202110504135 A CN202110504135 A CN 202110504135A CN 113316224 B CN113316224 B CN 113316224B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application relates to a method, a device, an equipment terminal and a storage medium for searching broadcast channels, wherein the searching method comprises the following steps: determining a target intermediate frequency signal corresponding to a current radio frequency point according to a plurality of preset intermediate frequency points, acquiring the signal average power of the target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window and the signal average power and noise average power corresponding to a last adjacent radio frequency point, calculating the difference value between the signal average power corresponding to the current radio frequency point and the signal average power corresponding to the last adjacent radio frequency point and judging whether the difference value is greater than a preset signal power threshold value or not, if so, calculating the absolute value of the difference value between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the last adjacent radio frequency point and judging whether the absolute value of the difference value is less than a preset noise power threshold value or not; and if so, taking the broadcast channel corresponding to the current radio frequency point as the target broadcast frequency. The searching method improves the channel quality of the searched target broadcast channel.
Description
Technical Field
The present application relates to the field of broadcast communication technologies, and in particular, to a method and an apparatus for searching a broadcast channel, a device terminal, and a storage medium.
Background
Currently, fm broadcast receiving devices are widely used, such as vehicle-mounted broadcast receiving equipment, etc., and the fm broadcast receiving device is adjusted to a corresponding frequency to receive a corresponding audio signal.
The method comprises the steps of determining a forbidden channel interval by inquiring a local radio broadcast full-channel list, selecting channels except the forbidden channel interval as broadcast transmission channels, setting the transmission frequency of a radio station frequency modulation transmission part, automatically avoiding other local broadcast channels, and preventing the set transmission frequency from colliding with the local broadcast channels.
However, even if such measures are taken, there is still interference from other channels or environmental noise, which still causes channel collision problem, resulting in that the fm broadcast receiving apparatus cannot search for the target broadcast channel or the channel quality of the searched target broadcast channel is poor.
Disclosure of Invention
In view of this, the present application provides a method for searching broadcast channels, so as to solve the technical problem that the existing fm broadcast apparatus cannot search a target broadcast channel or the channel quality of the searched target broadcast channel is poor.
The application provides a method for searching a broadcast channel, which comprises the following steps:
determining a target intermediate frequency signal corresponding to the current radio frequency point according to a plurality of preset intermediate frequency points;
acquiring the signal average power of a target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window, and the signal average power and the noise average power of the target intermediate frequency signal corresponding to the previous adjacent radio frequency point in the preset power spectrum window;
calculating the difference value between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the last adjacent radio frequency point and judging whether the difference value is greater than a preset signal power threshold value or not;
if so, calculating the absolute value of the difference between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the previous adjacent radio frequency point and judging whether the absolute value of the difference is smaller than a preset noise power threshold value;
and if so, taking the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
In at least one embodiment, the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points includes:
respectively calculating the signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point to obtain a corresponding signal-to-noise ratio set;
and comparing each signal-to-noise ratio in the signal-to-noise ratio set with a preset signal-to-noise ratio threshold value respectively to determine a target intermediate frequency signal.
In at least one embodiment, the step of comparing each signal-to-noise ratio in the set of signal-to-noise ratios with a preset signal-to-noise ratio threshold to determine the target intermediate frequency signal includes:
judging whether each signal-to-noise ratio larger than a preset signal-to-noise ratio threshold exists in the signal-to-noise ratio set or not;
if so, acquiring each signal-to-noise ratio which is greater than a preset signal-to-noise ratio threshold value in the signal-to-noise ratio set, and adding the signal-to-noise ratio into a new set to obtain a corresponding effective signal-to-noise ratio set;
and taking a preset intermediate frequency point corresponding to the minimum value in the effective signal-to-noise ratio set as a target receiving intermediate frequency to determine a corresponding target intermediate frequency signal.
In at least one embodiment, the step of respectively calculating the signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point to obtain a corresponding signal-to-noise ratio set includes:
acquiring each preset intermediate frequency point corresponding to the current radio frequency point;
and calculating the average signal-to-noise ratio of the preset intermediate frequency signal corresponding to each preset intermediate frequency point in a preset power spectrum window to obtain a corresponding signal-to-noise ratio set.
In at least one embodiment, the step of calculating an average signal-to-noise ratio of the preset intermediate frequency signal corresponding to each preset intermediate frequency point in a preset power spectrum window to obtain a corresponding signal-to-noise ratio set includes:
respectively carrying out zero frequency migration and low-pass filtering processing on a preset intermediate frequency signal corresponding to each preset intermediate frequency point so as to calculate the signal average power and the noise average power of each preset intermediate frequency signal in a preset power spectrum window;
and calculating a corresponding average signal-to-noise ratio according to the signal average power and the noise average power of each preset intermediate frequency signal in a preset power spectrum window to obtain a corresponding signal-to-noise ratio set.
In at least one embodiment, the above search method further includes:
and when the difference value is not greater than the preset signal power threshold value, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the difference value is greater than the preset signal power threshold value.
In at least one embodiment, the above search method further includes:
and when the absolute value of the difference is not less than the preset noise power threshold, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the absolute value of the difference is less than the preset noise power threshold.
In at least one embodiment, the above search method further includes:
when the signal-to-noise ratio larger than the preset signal-to-noise ratio threshold value does not exist in the signal-to-noise ratio set, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the signal-to-noise ratio larger than the preset signal-to-noise ratio threshold value exists in the signal-to-noise ratio set.
In at least one embodiment, the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points further includes:
and adjusting the signal receiving power of the current radio frequency point to a preset target receiving power, wherein the difference value between the signal receiving power and the preset target receiving power is smaller than a preset receiving power difference threshold.
Further, there is provided a search apparatus of a broadcast channel, the search apparatus including:
the signal determining unit is used for determining a target intermediate frequency signal corresponding to the current radio frequency point according to a plurality of preset intermediate frequency points;
the average power acquisition unit is used for acquiring the signal average power of a target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window, and the signal average power and the noise average power of the previous adjacent radio frequency point in the preset power spectrum window;
the first difference calculation unit is used for calculating the difference between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the previous adjacent radio frequency point;
the first judgment unit is used for judging whether the difference value is larger than a preset signal power threshold value or not;
the second difference value calculating unit is used for calculating the absolute value of the difference value between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the previous adjacent radio frequency point when the difference value is greater than the preset signal power threshold value;
the second judgment unit is used for judging whether the absolute value of the difference value is smaller than a preset noise power threshold value or not;
and the target broadcast channel determining unit is used for taking the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
In addition, an apparatus terminal is provided, which includes a processor and a memory, the memory is used for storing a computer program, and the processor runs the computer program to make the apparatus terminal execute the searching method.
Furthermore, a readable storage medium is provided, which stores a computer program, which when executed by a processor, is the above-mentioned search method.
The method for searching the broadcast channel further includes the steps of further obtaining the signal average power of a target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window and the signal average power and the noise average power of a previous adjacent radio frequency point in a preset power spectrum window on the basis that the target intermediate frequency signal corresponding to the current radio frequency point is determined according to a plurality of preset intermediate frequency points, then calculating the difference value between the signal average power corresponding to the current radio frequency point and the signal average power corresponding to the previous adjacent radio frequency point and judging whether the difference value is larger than a preset signal power threshold value or not, if yes, further calculating the absolute value of the difference value between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the previous adjacent radio frequency point and judging whether the absolute value of the difference value is smaller than a preset noise power threshold value or not, and taking the broadcast channel corresponding to the current radio frequency point as the target broadcast channel when the absolute value of the difference value is smaller than the preset noise power threshold value.
On one hand, the difference value between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the last adjacent radio frequency point is calculated to ensure that the corresponding difference value is greater than the preset signal power threshold value, and then whether other broadcast crosstalk signals with larger intensity exist in the last adjacent radio frequency point of the current radio frequency point can be judged, because the two radio broadcast signals cannot exist in the current radio frequency point and the last adjacent radio frequency point at the same time theoretically, if other broadcast crosstalk signals with larger intensity exist in the last adjacent radio frequency point, the difference value is smaller than or equal to the preset signal power threshold value.
On the other hand, the abnormal situation that a certain interference signal stays in the broadcast channel corresponding to the current radio frequency point can be further reduced by calculating the absolute value of the difference between the average signal power corresponding to the current radio frequency point and the average noise power corresponding to the previous adjacent radio frequency point and ensuring that the absolute value of the difference is smaller than the preset noise power threshold value so as to obtain the target broadcast channel.
According to the method for searching the broadcast channel, the difference value between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the previous adjacent radio frequency point is calculated to ensure that the corresponding difference value is larger than the preset signal power threshold value, the absolute value of the difference value between the average signal power corresponding to the current radio frequency point and the average noise power corresponding to the previous adjacent radio frequency point is calculated, and the absolute value of the difference value is smaller than the preset noise power threshold value to obtain the target broadcast channel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a first method for searching broadcast channels according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a second method for searching broadcast channels according to an embodiment of the present application;
fig. 3 is a flowchart illustrating a third method for searching broadcast channels according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a method for determining a target intermediate frequency signal corresponding to a current radio frequency point according to an embodiment of the present application;
fig. 5 is a schematic flowchart of another method for determining a target intermediate frequency signal corresponding to a current radio frequency point according to an embodiment of the present application;
fig. 6 is a flowchart illustrating a method for calculating a set of snr according to an embodiment of the present application;
fig. 7 is a schematic flowchart of another method for calculating a set of snr according to an embodiment of the present application;
fig. 8 is a flowchart illustrating a fourth method for searching broadcast channels according to an embodiment of the present application;
fig. 9 is a flowchart illustrating a fifth method for searching broadcast channels according to an embodiment of the present application;
fig. 10 is a flowchart illustrating a sixth method for searching broadcast channels according to an embodiment of the present application;
fig. 11 is a flowchart illustrating a seventh method for searching broadcast channels according to an embodiment of the present application;
fig. 12 is a first block diagram of a broadcast channel searching apparatus according to an embodiment of the present application;
fig. 13 is a second block diagram of a broadcast channel searching apparatus according to an embodiment of the present application;
fig. 14 is a block diagram of a third structure of an apparatus for searching broadcast channels according to an embodiment of the present application.
Detailed Description
In a conventional frequency modulation broadcast channel searching process, a carrier frequency is generally set as the channel frequency to receive, a received radio frequency signal is moved to a low-intermediate frequency signal, then zero-frequency moving processing is performed after the radio frequency signal passes through a low-pass filter, then the signal power and the noise power are counted to calculate a signal-to-noise ratio, and when the signal-to-noise ratio is greater than a preset signal-to-noise ratio threshold, it is determined that an effective broadcast station channel exists in the broadcast channel.
However, due to the characteristics of the fm broadcast user, the position of the transmitting station of the fm broadcast is fixed, and the fm broadcast receiving device may change continuously due to the distance required by the user, for example, the vehicle-mounted fm broadcast receiving device is more often in quick movement, so that under the condition that noise interference is not changed, the signal-to-noise ratio cannot reach the preset signal-to-noise ratio threshold due to too small radio frequency receiving signal, and therefore, an effective radio station cannot be searched; or the radio frequency receiving signal is too large to exceed the dynamic range of the analog receiving channel, which causes distortion of the radio frequency signal and poor quality of the received broadcasting channel, and at the same time, the radio frequency receiving signal is too large to cause leakage and crosstalk, which causes adjacent broadcasting channels or other broadcasting channels to hear the content of the channel, resulting in channel crosstalk.
The application provides a method for searching a broadcast channel, which aims to solve the technical problem that the existing frequency modulation broadcasting device cannot search a target broadcast channel or the channel quality of the searched target broadcast channel is poor.
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The following embodiments and their technical features may be combined with each other without conflict.
As shown in fig. 1, the present application provides a method for searching a broadcast channel, the method comprising:
step S110, determining a target intermediate frequency signal corresponding to the current radio frequency point according to a plurality of preset intermediate frequency points.
If a radio frequency receiving signal needs to be mixed to an intermediate frequency signal corresponding to a fixed intermediate frequency point according to a traditional radio station broadcasting channel searching method, however, a receiving chip of the fm broadcast receiving device or a receiving circuit itself generates harmonic waves, which easily generate harmonic waves, and the harmonic waves fall on the fixed intermediate frequency point, and mixed audio and harmonic waves are easily overlapped, which affects the channel receiving quality of the fm broadcast receiving device.
Therefore, when the radio frequency receiving signal is converted into the target intermediate frequency of the low and medium frequency band, a plurality of preset intermediate frequency points are set, a frequency interval with a preset amplitude exists between every two intermediate frequency points, the frequency modulation broadcast receiving equipment can traverse the plurality of preset intermediate frequency points to the current radio frequency point when a radio station broadcast channel is searched, and then a proper preset intermediate frequency point is selected from the preset intermediate frequency points, so that the target intermediate frequency signal corresponding to the current radio frequency point is determined, and the defect that harmonic waves generated by a receiving chip or a receiving circuit of the existing frequency modulation broadcast receiving equipment easily fall on the fixed intermediate frequency points is overcome.
In one embodiment, an appropriate preset intermediate frequency point is selected from a plurality of preset intermediate frequency points according to the difference of the signal-to-noise ratio of each preset intermediate frequency point, where the signal-to-noise ratio is the ratio of the signal power to the noise power.
In one embodiment, three preset intermediate frequency points f1, f2 and f3, namely a low frequency point, a middle frequency point and a high frequency point, are sequentially set, wherein the frequency points f2-f1=375khz, the frequency points f3-f2=268khz, the frequency points f1 are 1.5mhz, the frequency points f2 are 1.875mhz, the frequency points f3 are 2.143MHZ, the frequency modulation broadcast frequency band in China is 87.5MHZ to 108MHZ, and the frequency modulation broadcast searches one by taking 100KHz as an increasing step length to judge whether each corresponding current radio frequency point is an effective radio station broadcast channel (namely an effective radio station broadcast frequency point).
The low, medium and high preset intermediate frequency points f1, f2 and f3 are selected, so that the influence of harmonic waves generated by a receiving chip or a receiving circuit of the existing frequency modulation broadcast receiving equipment on the fixed intermediate frequency points is overcome, the searching speed of the frequency modulation broadcast station during channel searching is considered, and the problem that the channel searching speed of the frequency modulation broadcast station is too low due to the fact that too many preset intermediate frequency points are set is solved.
Step S120, acquiring the average signal power of the target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window, and the average signal power and the average noise power of the previous adjacent radio frequency point in the preset power spectrum window.
After determining the target intermediate frequency signal of the current radio frequency point, the fm broadcast receiving device can directly obtain the signal average power of the target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window, and the signal average power and the noise average power corresponding to the previous adjacent radio frequency point through calculation.
It should be noted that, in the subsequent steps of the present application, the average power of the signal and the average power of the noise corresponding to the radio frequency point both refer to the average power of the signal and the average power of the noise in a preset power spectrum window of the target intermediate frequency signal corresponding to the radio frequency point, because the power of the radio frequency signal received by the fm broadcast receiving apparatus is often too large, and the corresponding average power of the signal and the average power of the noise can be calculated after the radio frequency signal is converted into the intermediate frequency signal, which can be automatically understood by those skilled in the art. Step S130, calculating a difference between the average power of the signal corresponding to the current rf frequency point and the average power of the signal corresponding to the previous adjacent rf frequency point.
The reason why the difference is not the corresponding absolute difference value is that theoretically, when there is no interference, two radio station broadcasts generally do not exist at two adjacent radio frequency points, so that in an ideal state where there is no interference, when there is no radio station broadcast signal at the current radio frequency point, the previous adjacent radio frequency point does not exist at the current radio frequency point, the difference is generally a positive value, if there are other broadcast crosstalk signals with higher strength at the previous adjacent radio frequency point, the difference is a negative value, and if the difference absolute value is calculated and judged according to the difference absolute value, there still exists a possibility that the difference absolute value is greater than the preset signal power threshold, and thus there is no crosstalk signal at the previous adjacent radio frequency point.
The noise power is the power counted by the received signal of the current radio frequency point after intermediate frequency processing and band-pass filtering processing.
In one embodiment, the band pass filter has a center frequency of 100KHz during the band pass filtering process.
Step S140, determining whether the difference is greater than a predetermined signal power threshold, if yes, proceeding to step S150.
If other broadcasting crosstalk signals with larger strength exist in the previous adjacent radio frequency point, the difference value is smaller than or equal to the preset signal power threshold value, and therefore, whether the situation that other broadcasting station broadcasting crosstalk signals with larger strength exist in the previous adjacent radio frequency point of the current radio frequency point can be judged by calculating the difference value between the signal average power corresponding to the current radio frequency point and the signal average power corresponding to the previous adjacent radio frequency point and judging whether the difference value is larger than the preset signal power threshold value, and the crosstalk situation of the broadcasting station broadcasting signals among different radio frequency points is greatly avoided.
Step S150, calculating the absolute value of the difference between the average power of the signal corresponding to the current radio frequency point and the average power of the noise corresponding to the last adjacent radio frequency point.
After the difference between the average signal power corresponding to the current rf frequency point and the average signal power corresponding to the previous adjacent rf frequency point is determined, the absolute value of the difference between the average signal power corresponding to the current rf frequency point and the average noise power corresponding to the previous adjacent rf frequency point needs to be further calculated, and the absolute value of the difference needs to be determined, because for any current rf frequency point, there may be some rf interference signal staying in the broadcast channel corresponding to the current rf frequency point, so the step S160 is performed by calculating the absolute value of the difference and determining the absolute value of the difference. When there is no interference, the previous adjacent rf frequency point usually uses the signal of the current rf frequency point as noise, so that the average signal power corresponding to the current rf frequency point is usually equal to or very close to the average noise power corresponding to the previous adjacent rf frequency point, and therefore the actual power difference between the average signal power corresponding to the current rf frequency point and the average noise power corresponding to the previous adjacent rf frequency point is usually within a certain range, and the difference usually represents interference by corresponding to the absolute value of the difference between the two.
Step S160, determining whether the absolute value of the difference is smaller than a preset noise power threshold, if yes, entering step S170.
In theory, when there is no interference, the average power of the signal corresponding to the current rf frequency point is usually equal to or very close to the average power of the noise corresponding to the previous adjacent rf frequency point, so that the absolute value of the difference between the two (i.e. the difference between the two) is inevitably within a certain range of power value, which is usually called as a preset noise power threshold, and therefore, in an actual situation, it can be determined whether there is interference in the current rf frequency point by determining whether the absolute value of the difference is smaller than the preset noise power threshold.
Step S170, using the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
The execution sequence of the steps S130 to S140 and the execution sequence of the steps S150 to S160 may be changed, and is not limited successively.
According to the method for searching the broadcast channel, on the basis that the target intermediate frequency signal corresponding to the current radio frequency point is determined according to the preset intermediate frequency points, the signal average power and the noise average power of the target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window are further obtained, then the difference value between the signal average power corresponding to the current radio frequency point and the signal average power corresponding to the previous adjacent radio frequency point is calculated, whether the difference value is larger than a preset signal power threshold value or not is judged, if yes, the absolute value of the difference value between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the previous adjacent radio frequency point is further calculated, whether the absolute value of the difference value is smaller than a preset noise power threshold value or not is judged, and when the absolute value of the difference value is smaller than the preset noise power threshold value, the broadcast channel corresponding to the current radio frequency point is used as the target broadcast channel.
On one hand, the difference value between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the last adjacent radio frequency point is calculated to ensure that the corresponding difference value is greater than the preset signal power threshold value, so that whether other broadcast crosstalk signals with larger strength exist in the last adjacent radio frequency point of the current radio frequency point can be judged, because two radio station broadcast signals cannot exist in the current radio frequency point and the last adjacent radio frequency point at the same time theoretically, and if other broadcast crosstalk signals with larger strength exist in the last adjacent radio frequency point, the difference value is smaller than or equal to the preset signal power threshold value.
On the other hand, the abnormal situation that a certain interference signal stays in the broadcast channel corresponding to the current radio frequency point can be further effectively avoided by further calculating the absolute value of the difference between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the previous adjacent radio frequency point and ensuring that the absolute value of the difference is smaller than the preset noise power threshold value, because the signal average power corresponding to the current radio frequency point is usually equal to or very close to the noise average power corresponding to the previous adjacent radio frequency point, and if the corresponding absolute value of the difference is too large, it is indicated that the signal average power corresponding to the current radio frequency point is possibly large because a certain radio frequency interference signal stays in the broadcast channel corresponding to the current radio frequency point, and the absolute value of the difference is further large.
According to the method for searching the broadcast channel, the difference value between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the previous adjacent radio frequency point is calculated to ensure that the corresponding difference value is larger than the preset signal power threshold value, the absolute value of the difference value between the average signal power corresponding to the current radio frequency point and the average noise power corresponding to the previous adjacent radio frequency point is calculated, and the absolute value of the difference value is smaller than the preset noise power threshold value to obtain the target broadcast channel.
In at least one embodiment, as shown in fig. 2, another broadcast channel searching method is provided, where the searching method includes steps S110, S120, S130, S140, and S170 in fig. 1, and compared with the broadcast channel searching method shown in fig. 1, the broadcast channel searching method shown in fig. 2 is different in that steps S150 and S160 are omitted, that is, a process of calculating and determining an absolute value of a difference between a signal average power corresponding to a current radio frequency point and a noise average power corresponding to a previous adjacent radio frequency point is omitted.
In addition, it should be noted that in the searching method shown in fig. 2, step S120 includes obtaining the average signal power of the target intermediate frequency signal corresponding to the current radio frequency point in the preset power spectrum window and the average signal power corresponding to the previous adjacent radio frequency point, and the step of obtaining the average noise power corresponding to the previous adjacent radio frequency point is omitted.
In the searching method shown in fig. 2, on the basis of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points, the difference between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the previous adjacent radio frequency point is further calculated, and then whether other radio station broadcast crosstalk signals with higher strength exist in the previous adjacent radio frequency point of the current radio frequency point can be judged, so that the crosstalk condition of the radio station broadcast signals among different radio frequency points is reduced.
In at least one embodiment, as shown in fig. 3, another broadcast channel searching method is provided, where the searching method includes steps S110, S120, S150, S160, and S170 in fig. 1, and compared with the broadcast channel searching method shown in fig. 1, the broadcast channel searching method shown in fig. 3 is different in that steps S130 and S140 are omitted, that is, a process of calculating and determining a difference between an average signal power corresponding to a current radio frequency point and an average signal power corresponding to a previous adjacent radio frequency point is omitted.
It should be noted that, in the searching method shown in fig. 3, step S120 includes obtaining a signal average power of a target intermediate frequency signal corresponding to a current radio frequency point in a preset power spectrum window and a noise average power of a previous adjacent radio frequency point in the preset power spectrum window, and the step of obtaining the signal average power of the previous adjacent radio frequency point in the preset power spectrum window is omitted.
In the broadcast channel searching method shown in fig. 3, on the basis of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points, the absolute value of the difference between the signal average power corresponding to the current radio frequency point and the noise average power of the previous adjacent radio frequency point in the preset power spectrum window can be further calculated, and the absolute value of the difference is ensured to be smaller than the preset noise power threshold value to obtain the target broadcast channel, so that the abnormal situation that the radio frequency interference signal stays in the broadcast channel corresponding to the current radio frequency point can be still greatly avoided, the searched invalid radio station broadcast channel is greatly reduced, and the efficiency of searching the target broadcast channel and the channel quality of the obtained target broadcast channel are generally improved.
In at least one embodiment, as shown in fig. 4, step S110 includes:
step S112, respectively calculating the signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point to obtain a corresponding signal-to-noise ratio set.
The frequency modulation broadcast receiving equipment respectively searches a plurality of preset intermediate frequency points corresponding to the current radio frequency point in a traversing manner when the radio station broadcast channel is searched for at any current radio frequency point, and at the moment, the signal to noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point needs to be calculated, so that a corresponding signal to noise ratio set is obtained, and a foundation is laid for the process of screening the plurality of preset intermediate frequency points according to the signal to noise ratio in the subsequent step S114.
Step S114, comparing each signal-to-noise ratio in the signal-to-noise ratio set with a preset signal-to-noise ratio threshold value respectively to determine a target intermediate frequency signal.
The signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point is compared with a preset signal-to-noise ratio threshold, and then the preset intermediate frequency point with the signal-to-noise ratio meeting the requirement of the preset signal-to-noise ratio threshold is selected, so that the corresponding target intermediate frequency signal is determined, and a foundation is laid for the subsequent processing process.
In at least one embodiment, as shown in fig. 5, step S114 includes:
step S114a, determining whether each snr in the snr set is greater than a preset snr threshold, if so, entering step S114b for processing.
And step S114b, acquiring each signal-to-noise ratio which is greater than a preset signal-to-noise ratio threshold value in the signal-to-noise ratio set, and adding the signal-to-noise ratio into a new set to obtain a corresponding effective signal-to-noise ratio set.
Step S114c, using a preset intermediate frequency point corresponding to the minimum value in the effective snr set as a target receiving intermediate frequency, so as to determine a corresponding target intermediate frequency signal.
In this case, the preset intermediate frequency point corresponding to the minimum value in the effective signal-to-noise ratio set is selected as the target receiving intermediate frequency through the step S114c, so that the influence of the harmonic generated by the chip or the circuit of the frequency modulation broadcast receiving device on the target receiving intermediate frequency can be greatly reduced, and the channel quality of the obtained target intermediate frequency signal is improved.
In at least one embodiment, as shown in FIG. 6, step S112 includes:
step S1122, obtain each preset intermediate frequency point corresponding to the current radio frequency point.
Step S1124 is to calculate an average signal-to-noise ratio of the preset intermediate frequency signal corresponding to each preset intermediate frequency point in a preset power spectrum window, so as to obtain a corresponding signal-to-noise ratio set.
The reason that the signal-to-noise ratio at a single moment is relatively high, the calculation of the preset intermediate frequency signal corresponding to each preset intermediate frequency point in the preset power spectrum window is needed, and the real signal-to-noise ratio of the preset intermediate frequency signal can be reflected.
In at least one embodiment, as shown in FIG. 7, step S1124 includes:
in step S1124a, zero frequency shift and low-pass filtering are performed on the preset if signal corresponding to each preset if frequency point, so as to calculate the signal average power and the noise average power of each preset if signal in the preset power spectrum window.
Before calculating the signal average power and the noise average power of each preset intermediate frequency signal in the preset power spectrum window, the zero frequency shift and the low-pass filtering process are generally required to be performed on the preset intermediate frequency signal corresponding to each preset intermediate frequency point, so as to simplify the calculation process.
The method comprises the steps of setting a power spectrum window for each preset intermediate frequency signal, continuously and respectively counting the signal power and the noise power of N (N is a positive integer and is more than or equal to 3) equal interval moments to obtain a signal power set containing N signal powers and a noise power set containing N noise powers, removing the maximum value and the minimum value in the signal power set and the noise power set, and dividing the maximum value and the minimum value by N-2 respectively to obtain the signal average power and the noise average power of each preset intermediate frequency signal in the preset power spectrum window.
Step S1124b, calculating a corresponding average signal-to-noise ratio according to the signal average power and the noise average power of each preset intermediate frequency signal in the preset power spectrum window, so as to obtain a corresponding signal-to-noise ratio set.
In one embodiment, the average signal-to-noise ratio is expressed in SNR and the average power of the signal is expressed in P sv Expressed as the noise mean power in P nv Expressed, SNR = log (P) sv )-log(P nv )。
In at least one embodiment, as shown in fig. 8, the search method further includes:
and S180, when the difference is not greater than the preset signal power threshold, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the difference is greater than the preset signal power threshold.
When the difference is not greater than the preset signal power threshold, it is indicated that other broadcast crosstalk signals with relatively high strength exist at a radio frequency point adjacent to the current radio frequency point, which is likely to affect the current radio frequency point, and at this time, the broadcast channel corresponding to the current radio frequency point is an invalid broadcast frequency, and the process needs to be returned to step S110 for processing until the difference is greater than the preset signal power threshold.
In at least one embodiment, as shown in fig. 9, the search method further includes:
and step S190, when the absolute value of the difference value is not less than the preset noise power threshold value, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the absolute value of the difference value is less than the preset noise power threshold value.
When the absolute value of the difference is not less than the preset noise power threshold, it indicates that there may be a case where a certain radio frequency interference signal stays in the broadcast channel corresponding to the current radio frequency point, resulting in a case where the average power of the signal corresponding to the current radio frequency point is relatively large, and thus the absolute value of the difference is relatively large, and at this time, it should be determined that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, and the step S110 is returned to process until the absolute value of the difference is less than the preset noise power threshold.
In at least one embodiment, as shown in fig. 10, the search method further includes:
step S200, when the signal-to-noise ratio larger than the preset signal-to-noise ratio threshold value does not exist in the signal-to-noise ratio set, the broadcast channel corresponding to the current radio frequency point is judged to be an invalid broadcast channel, the next radio frequency point is obtained to serve as a new current radio frequency point, and the step S112 is returned to process until the signal-to-noise ratio larger than the preset signal-to-noise ratio threshold value exists in the signal-to-noise ratio set.
When the signal-to-noise ratio greater than the preset signal-to-noise ratio threshold does not exist in the signal-to-noise ratio set, it should be determined that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, and a next radio frequency point is obtained as a new current radio frequency point, and it is further necessary to return to step S110 for processing.
In at least one embodiment, as shown in fig. 11, step S110 further includes:
step S210, adjusting the signal receiving power of the current radio frequency point to a preset target receiving power, where a difference between the signal receiving power and the preset target receiving power is smaller than a preset receiving power difference threshold.
According to the characteristic that the position of a frequency modulation broadcast user is not fixed, an automatic gain adjusting device is introduced into frequency modulation broadcast receiving equipment, when a channel is searched, the signal receiving power corresponding to the current radio frequency point is counted, and the preset target receiving power is set according to the dynamic range of normal work of a receiving channel of the frequency modulation broadcast receiving equipment.
When the signal receiving power of the current radio frequency point is smaller than the preset target receiving power, the gain gear of the automatic gain adjusting device is increased until the signal receiving power is larger than the preset target receiving power.
When the signal receiving power is greater than the predetermined target receiving power and the difference between the signal receiving power and the predetermined target receiving power is greater than the predetermined receiving power difference threshold, the gain stage of the automatic gain control device needs to be further reduced until the difference between the signal receiving power and the predetermined target receiving power is less than the predetermined receiving power difference threshold.
Further, as shown in fig. 12, there is also provided a search apparatus 300 for a broadcast channel, the search apparatus 300 including:
a signal determining unit 310, configured to determine, according to a plurality of preset intermediate frequency points, a target intermediate frequency signal corresponding to a current radio frequency point;
an average power obtaining unit 320, configured to obtain a signal average power of a target intermediate frequency signal corresponding to a current radio frequency point in a preset power spectrum window, and a signal average power and a noise average power of a previous adjacent radio frequency point in the preset power spectrum window;
a first difference calculating unit 330, configured to calculate a difference between the average signal power corresponding to the current rf frequency point and the average signal power corresponding to the previous adjacent rf frequency point;
a first determining unit 340, configured to determine whether the difference is greater than a preset signal power threshold;
a second difference calculating unit 350, configured to calculate an absolute value of a difference between a signal average power corresponding to the current radio frequency point and a noise average power corresponding to the previous adjacent radio frequency point when the difference is greater than a preset signal power threshold;
a second determining unit 360, configured to determine whether the absolute value of the difference is smaller than a preset noise power threshold;
and a target broadcast channel determining unit 370, configured to, when the absolute value of the difference is smaller than the preset noise power threshold, use the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
Further, as shown in fig. 13, there is also provided a search apparatus 400 for a broadcast channel, the search apparatus 400 including:
a signal determining unit 310, configured to determine, according to a plurality of preset intermediate frequency points, a target intermediate frequency signal corresponding to a current radio frequency point;
an average power obtaining unit 320, configured to obtain a signal average power of a target intermediate frequency signal corresponding to a current radio frequency point in a preset power spectrum window, and a signal average power of a previous adjacent radio frequency point in the preset power spectrum window;
a first difference calculating unit 330, configured to calculate a difference between the average signal power corresponding to the current rf frequency point and the average signal power corresponding to the previous adjacent rf frequency point;
a first determining unit 340, configured to determine whether the difference is greater than a preset signal power threshold;
and a target broadcast channel determining unit 370, configured to use the broadcast channel corresponding to the current radio frequency point as a target broadcast channel when the difference is greater than the preset signal power threshold.
Compared with the searching apparatus 300 shown in fig. 12, in the searching apparatus 400 shown in fig. 13, the average power obtaining unit 320 is only used to obtain the average power of the signal in the preset power spectrum window of the target intermediate frequency signal corresponding to the current radio frequency point and the average power of the signal in the preset power spectrum window of the previous adjacent radio frequency point, and a functional limitation for obtaining the average power of the signal in the preset power spectrum window of the previous adjacent radio frequency point is omitted.
Further, as shown in fig. 14, there is also provided a search apparatus 500 for a broadcast channel, the search apparatus 500 including:
a signal determining unit 310, configured to determine, according to a plurality of preset intermediate frequency points, a target intermediate frequency signal corresponding to a current radio frequency point;
an average power obtaining unit 320, configured to obtain a signal average power of a target intermediate frequency signal corresponding to a current radio frequency point in a preset power spectrum window, and a noise average power of a previous adjacent radio frequency point in the preset power spectrum window;
a second difference calculating unit 350, configured to calculate an absolute value of a difference between a signal average power corresponding to the current radio frequency point and a noise average power corresponding to the previous adjacent radio frequency point;
a second judging unit 360, configured to judge whether the absolute value of the difference is smaller than a preset noise power threshold;
and a target broadcast channel determining unit 370, configured to, when the absolute value of the difference is smaller than the preset noise power threshold, take the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
Compared with the searching apparatus 300 shown in fig. 12, the average power obtaining unit 320 in the searching apparatus 500 shown in fig. 14 is only used to obtain the average power of the target intermediate frequency signal corresponding to the current radio frequency point in the preset power spectrum window and the average power of the noise of the previous adjacent radio frequency point in the preset power spectrum window, and a functional limitation for obtaining the average power of the noise of the previous adjacent radio frequency point in the preset power spectrum window is omitted.
In addition, an apparatus terminal is provided, which includes a processor and a memory, the memory is used for storing a computer program, and the processor runs the computer program to make the apparatus terminal execute the searching method.
The division of each unit in the above search apparatus is only used for illustration, and in other embodiments, the search apparatus may be divided into different units as needed to complete all or part of the functions of the above search apparatus. For the specific limitation of the search device, reference may be made to the above limitation of the search method, which is not described herein again.
Furthermore, a readable storage medium is provided, which stores a computer program, which when executed by a processor performs the above-described search method.
Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. This application is intended to embrace all such modifications and variations and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the specification.
That is, the above embodiments are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by the contents of the specification and the drawings, such as the mutual combination of technical features between the embodiments, or the direct or indirect application to other related technical fields, are included in the scope of the present application.
In addition, structural elements having the same or similar characteristics may be identified by the same or different reference numerals. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Claims (12)
1. A method for searching a broadcast channel, the method comprising:
determining a target intermediate frequency signal corresponding to the current radio frequency point according to a plurality of preset intermediate frequency points;
acquiring the signal average power of a target intermediate frequency signal corresponding to a current radio frequency point in a preset power spectrum window, and the signal average power and the noise average power of a target intermediate frequency signal corresponding to a previous adjacent radio frequency point in the preset power spectrum window;
calculating the difference value between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the last adjacent radio frequency point and judging whether the difference value is greater than a preset signal power threshold value or not;
if so, calculating the absolute value of the difference between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the last adjacent radio frequency point and judging whether the absolute value of the difference is smaller than a preset noise power threshold value;
and if so, taking the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
2. The searching method according to claim 1, wherein the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points comprises:
respectively calculating the signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point to obtain a corresponding signal-to-noise ratio set;
and comparing each signal-to-noise ratio in the signal-to-noise ratio set with a preset signal-to-noise ratio threshold value respectively to determine a target intermediate frequency signal.
3. The searching method according to claim 2, wherein the step of comparing each snr in the set of snrs with a preset snr threshold to determine a target if signal comprises:
judging whether each signal-to-noise ratio larger than a preset signal-to-noise ratio threshold exists in the signal-to-noise ratio set or not;
if so, acquiring each signal-to-noise ratio which is greater than a preset signal-to-noise ratio threshold value in the signal-to-noise ratio set, and adding the signal-to-noise ratio into a new set to obtain a corresponding effective signal-to-noise ratio set;
and taking a preset intermediate frequency point corresponding to the minimum value in the effective signal-to-noise ratio set as a target receiving intermediate frequency to determine a corresponding target intermediate frequency signal.
4. The searching method according to claim 2, wherein the step of respectively calculating the signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point to obtain the corresponding signal-to-noise ratio set comprises:
acquiring each preset intermediate frequency point corresponding to the current radio frequency point;
and calculating the average signal-to-noise ratio of the preset intermediate frequency signal corresponding to each preset intermediate frequency point in a preset power spectrum window to obtain a corresponding signal-to-noise ratio set.
5. The searching method according to claim 4, wherein the step of calculating an average signal-to-noise ratio of the preset intermediate frequency signal corresponding to each preset intermediate frequency point in a preset power spectrum window to obtain a corresponding signal-to-noise ratio set comprises:
respectively carrying out zero frequency migration and low-pass filtering processing on a preset intermediate frequency signal corresponding to each preset intermediate frequency point so as to calculate the signal average power and the noise average power of each preset intermediate frequency signal in a preset power spectrum window;
and calculating a corresponding average signal-to-noise ratio according to the signal average power and the noise average power of each preset intermediate frequency signal in a preset power spectrum window to obtain a corresponding signal-to-noise ratio set.
6. The search method of claim 1, further comprising:
and when the difference value is not greater than the preset signal power threshold value, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the difference value is greater than the preset signal power threshold value.
7. The search method according to claim 1, wherein the search method comprises:
and when the absolute value of the difference is not less than the preset noise power threshold, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, and returning to the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points for processing until the absolute value of the difference is less than the preset noise power threshold.
8. The search method of claim 3, further comprising:
when the signal-to-noise ratio set does not have the signal-to-noise ratio larger than the preset signal-to-noise ratio threshold value, judging that the broadcast channel corresponding to the current radio frequency point is an invalid broadcast channel, acquiring the next radio frequency point as a new current radio frequency point, returning to the step of respectively calculating the signal-to-noise ratio of each preset intermediate frequency point corresponding to the current radio frequency point, and processing the step of acquiring the corresponding signal-to-noise ratio set until the signal-to-noise ratio larger than the preset signal-to-noise ratio threshold value exists in the signal-to-noise ratio set.
9. The searching method according to claim 1, wherein the step of determining the target intermediate frequency signal corresponding to the current radio frequency point according to the plurality of preset intermediate frequency points further comprises:
and adjusting the signal receiving power of the current radio frequency point to a preset target receiving power, wherein the difference value between the signal receiving power and the preset target receiving power is smaller than a preset receiving power difference threshold value.
10. A search apparatus for a broadcast channel, the search apparatus comprising:
the signal determining unit is used for determining a target intermediate frequency signal corresponding to the current radio frequency point according to a plurality of preset intermediate frequency points;
the average power acquisition unit is used for acquiring the signal average power of a target intermediate frequency signal corresponding to the current radio frequency point in a preset power spectrum window, and the signal average power and the noise average power of a target intermediate frequency signal corresponding to the previous adjacent radio frequency point in the preset power spectrum window;
the first difference calculation unit is used for calculating the difference between the average signal power corresponding to the current radio frequency point and the average signal power corresponding to the previous adjacent radio frequency point;
the first judgment unit is used for judging whether the difference value is larger than a preset signal power threshold value or not;
the second difference value calculating unit is used for calculating the absolute value of the difference value between the signal average power corresponding to the current radio frequency point and the noise average power corresponding to the previous adjacent radio frequency point when the difference value is larger than the preset signal power threshold value;
the second judgment unit is used for judging whether the absolute value of the difference value is smaller than a preset noise power threshold value or not;
and the target broadcast channel determining unit is used for taking the broadcast channel corresponding to the current radio frequency point as a target broadcast channel.
11. A device terminal, characterized in that the device terminal comprises a processor and a memory for storing a computer program, the processor running the computer program to cause the device terminal to perform the search method of any one of claims 1 to 9.
12. A readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the search method of any one of claims 1 to 9.
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