CN108880720B - Automatic channel searching method and device for radio equipment and radio equipment - Google Patents
Automatic channel searching method and device for radio equipment and radio equipment Download PDFInfo
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- CN108880720B CN108880720B CN201710214626.6A CN201710214626A CN108880720B CN 108880720 B CN108880720 B CN 108880720B CN 201710214626 A CN201710214626 A CN 201710214626A CN 108880720 B CN108880720 B CN 108880720B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
- H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
- H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
- H04H60/43—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast channels
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- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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Abstract
The invention is suitable for the technical field of analog signal demodulation, and provides an automatic channel searching method and device for radio equipment and the radio equipment, wherein the method comprises the following steps: segmenting the frequency range of the whole radio station, and adjusting the receiver to the starting frequency of each wave band to obtain the frequency spectrum information of the corresponding wave band; the spectrum information of each wave band is combined into a full-wave band spectrum energy table and stored; analyzing the frequency spectrum information one by one to obtain a plurality of pre-selection radio station frequencies; starting a demodulator to demodulate each preset radio station frequency, and acquiring and storing a frequency modulation composite baseband signal obtained by demodulation; the invention adopts the method of carrying out spectrum analysis on the signals of frequency modulation broadcasting, can quickly locate the position which is possible to be a radio station, can analyze the position of harmonic interference to remove repeated channels, and thus accurately realizes automatic channel searching.
Description
Technical Field
The invention belongs to the technical field of analog signal demodulation, and particularly relates to an automatic channel searching method and device for radio equipment and the radio equipment.
Background
The current automatic searching of the fm radio is to calculate the in-band energy result, i.e. the Received Signal Strength Indication (RSSI), for the Signal of each possible station frequency, and determine whether the Received Signal Strength Indication is a valid station or not with a set threshold. However, since the RSSI scheme is noncoherent detection, it is impossible to distinguish between a modem signal and a noise signal. Even if some improved schemes sample a similar adaptive mode to improve the performance, the noise point is still easily judged to be a false station or some weak stations are omitted. Meanwhile, some improved schemes in the existing automatic channel searching method for radio equipment may increase the examination of some specific signals, but such schemes can generally only judge some signals with obvious characteristics in the time domain, such as the pilot signal of a sine wave, and this method has these disadvantages: first, a mono station may not have a pilot signal; secondly, if the channel is subjected to repeated channel interference or mirror interference, the pilot signal may be demodulated to cause misjudgment.
In summary, the existing radio channel searching method has the problems of mistakenly identifying the noise signal as the effective radio station, missing some radio stations with weak signals, or being incapable of effectively searching the single-channel radio station and poor anti-interference performance
Disclosure of Invention
The embodiment of the invention provides an automatic channel searching method and device for radio equipment and the radio equipment, and aims to solve the problems that the existing channel searching method for the radio equipment mistakenly identifies a noise signal as an effective radio station, or omits some radio stations with weak signals, or cannot effectively search a single-channel radio station and is poor in anti-interference performance.
In a first aspect, an automatic channel searching method for a radio device is provided, where the method includes:
segmenting the frequency range of the whole radio station, and adjusting the receiver to the starting frequency of each wave band to obtain the frequency spectrum information of the corresponding wave band;
the spectrum information of each wave band is combined into a full-wave band spectrum energy table and stored;
analyzing the frequency spectrum information one by one to obtain a plurality of pre-selection radio station frequencies;
starting a demodulator to demodulate each preset radio station frequency, and acquiring and storing a frequency modulation composite baseband signal obtained by demodulation;
and calling a discrete Fourier transformer to analyze each frequency modulation composite baseband signal to obtain the accurate frequency spectrum of each radio station signal.
Further, the segmenting the frequency range of the whole radio station, and the receiver adjusting the starting frequency of each band, acquiring the spectrum information of the corresponding band includes:
setting the bandwidth of a filter according to the effective bandwidth of the analog-to-digital converter, and segmenting the frequency range of the whole radio station;
the receiver adjusts the starting frequency of each wave band, samples each wave band through the memory controller, and analyzes the sampling signal to be stored as frequency spectrum information.
Further, the analyzing the spectrum information one by one to obtain a plurality of pre-selected station frequencies comprises:
acquiring energy peak positions according to the frequency spectrum information of each wave band;
screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold;
and detecting the frequency positions of the possible radio stations through a preset heavy station model, eliminating heavy stations and acquiring a plurality of preselected radio station frequencies.
Further, the method further comprises:
analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal, and rechecking the accurate frequency spectrum of each radio station signal;
and storing the accurate frequency spectrum of the frequency modulation composite baseband signal of each radio station obtained through rechecking, and taking the accurate frequency spectrum as the characteristic of the corresponding radio station.
Further, the analyzing the spectrum distribution characteristics of each fm composite baseband signal, and reviewing the accurate spectrum of each radio station signal includes:
analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal one by one;
if the energy distribution range or amplitude characteristic of the currently analyzed frequency modulation composite baseband signal obviously does not accord with the preset standard, the frequency position corresponding to the frequency modulation composite baseband signal is caused by an interference signal, the frequency position is identified as a false station, the frequency record of the station is deleted, and the frequency modulation composite baseband signal of the next station frequency is continuously analyzed;
if the energy of the currently analyzed frequency modulation composite baseband signal is mostly distributed between 0 KHz and 15KHz, the currently analyzed frequency modulation composite baseband signal is identified as a single sound channel radio station, and the next frequency modulation composite baseband signal is analyzed continuously;
if the energy of the currently analyzed FM composite baseband signal has a pilot signal at the position of 19KHz, and the energy distribution of 0-15KHz, 19KHz and 23KHz-53KHz are in accordance with the stereo standard, identifying the signal as a stereo radio station, and continuing to analyze the next FM composite baseband signal.
In a second aspect, an automatic channel searching device for radio equipment is provided, the device comprising:
the segmented scanning unit is used for segmenting the frequency range of the whole radio station, and the receiver adjusts the initial frequency of each wave band to obtain the frequency spectrum information of the corresponding wave band;
the spectrum storage unit is used for forming the spectrum information of each waveband into a full-waveband spectrum energy table and storing the full-waveband spectrum energy table;
the radio station primary selection unit is used for analyzing the frequency spectrum information one by one to obtain a plurality of pre-selected radio station frequencies;
the base band signal acquisition unit is used for starting the demodulator to demodulate each preset radio station frequency, and acquiring and storing the frequency modulation composite base band signal obtained by demodulation;
and the radio station acquisition unit is used for calling a discrete Fourier transformer to analyze each frequency modulation composite baseband signal and acquiring the accurate frequency spectrum of each radio station signal.
Further, the segment scanning unit includes:
the signal segmentation template is used for setting the bandwidth of a filter according to the effective bandwidth of the analog-to-digital converter and segmenting the frequency range of the whole radio station;
and the frequency spectrum acquisition template is used for adjusting the receiver to the starting frequency of each wave band, sampling each wave band through the memory controller, and analyzing the sampling signal as frequency spectrum information for storage.
Further, the station primary selection unit comprises:
the peak obtaining module is used for obtaining energy peak positions according to the frequency spectrum information of each wave band;
the radio station screening module is used for screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold;
and the heavy station rejection module is used for detecting the frequency positions of the possible radio stations through a preset heavy station model, rejecting the heavy stations and acquiring the frequencies of a plurality of preselected radio stations.
Further, the apparatus further comprises:
the radio station rechecking unit is used for analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal and rechecking the accurate frequency spectrum of each radio station signal;
and the characteristic storage unit is used for storing the accurate frequency spectrum of the frequency modulation composite baseband signal of each radio station obtained through rechecking and taking the accurate frequency spectrum as the characteristic of the corresponding radio station.
Further, the station review unit includes:
the characteristic analysis module is used for analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal one by one;
a false station deleting module, configured to, if a feature of an energy distribution range or an amplitude of a currently analyzed fm composite baseband signal obviously does not meet a preset standard, identify a frequency position corresponding to the fm composite baseband signal as a false station due to an interference signal, delete the radio station frequency record, and continue to analyze an fm composite baseband signal of a next radio station frequency;
the monaural radio station identification module is used for identifying a monaural radio station if the energy of the currently analyzed frequency modulation composite baseband signal is mostly distributed between 0 and 15KHz, and continuing to analyze the next frequency modulation composite baseband signal;
and the stereo radio station identification module is used for identifying a stereo radio station if the energy of the currently analyzed frequency modulation composite baseband signal has a pilot signal at the position of 19KHz and the energy distribution of 0-15KHz, 19KHz and 23KHz-53KHz accords with the stereo standard, and continuing to analyze the next frequency modulation composite baseband signal.
In a third aspect, a radio receiver is provided, which comprises a radio receiving circuit including a phase locked loop, a filter, a demodulator, a memory controller, and a discrete fourier transformer;
the memory controller is used for storing the radio station signals;
the memory controller is also used for controlling and executing the automatic channel searching method for the radio equipment.
In the embodiment of the invention, the frequency range of the whole radio station is segmented, and the receiver adjusts the starting frequency of each wave band to obtain the frequency spectrum information of the corresponding wave band; the spectrum information of each wave band is combined into a full-wave band spectrum energy table and stored; analyzing the frequency spectrum information one by one to obtain a plurality of pre-selection radio station frequencies; starting a demodulator to demodulate each preset radio station frequency, and acquiring and storing a frequency modulation composite baseband signal obtained by demodulation; the invention searches and confirms the radio station by adopting a method of carrying out spectrum analysis on the signals of the frequency modulation broadcast, converts the frequency-modulated time domain signals and the demodulated time domain signals into frequency spectrums by utilizing the Fourier transformer, counts the frequency spectrums of the whole frequency modulation broadcast wave band, can quickly locate the position which is possibly the radio station, and can analyze the position of harmonic interference to remove the repeated station and analyze the position of the harmonic interference to remove the repeated station, thereby accurately realizing automatic channel search.
Drawings
Fig. 1 is a block diagram of a radio device according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an implementation of an automatic channel searching method for a radio device according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating an implementation of an automatic channel searching method for a radio device according to a third embodiment of the present invention;
fig. 4 is a block diagram of an automatic channel searching apparatus for a radio device according to a fourth embodiment of the present invention;
fig. 5 is a block diagram of an automatic channel searching apparatus for a radio device according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Fig. 1 shows a specific structural block diagram of a radio receiver according to a first embodiment of the present invention, and for convenience of description, only the parts related to the first embodiment of the present invention are shown. In the present embodiment, the sound reception apparatus 1 includes: a radio receiver 11 and a radio receiving circuit 12, as shown in fig. 6, the radio receiving circuit 12 includes an analog-to-digital converter, a phase-locked loop, a control and judgment module, a filter, a demodulator, a memory controller, a discrete fourier transformer, a fm baseband signal decoder and a digital-to-analog converter, wherein the radio receiver outputs a received radio signal to the analog-to-digital converter, the analog-to-digital converter is used to convert the radio signal into a digital signal and output the digital signal to the filter, and the effective bandwidth of the analog-to-digital converter determines the bandwidth of the filter, and a plurality of mhz bands can be analyzed each time, so as to quickly complete the initial selection work, wherein the bandwidth of the filter is set according to the effective bandwidth of the analog-to-digital converter, and the; the memory controller samples each band and uses the sampled signal as spectrum information. Then, the control judgment module controls the memory controller to store the frequency spectrum information of each band and stores the frequency spectrum information in the memory, the frequency spectrum information is analyzed one by one to obtain a plurality of pre-selection radio station frequencies, and specifically, the energy peak position is obtained according to the frequency spectrum information of each band; screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold; and detecting the frequency positions of the possible radio stations through a preset heavy station model, eliminating heavy stations and acquiring a plurality of preselected radio station frequencies. Starting a demodulator to demodulate each preset radio station frequency, and acquiring and storing a frequency modulation composite baseband signal obtained by demodulation; a discrete Fourier transformer is used for analyzing each frequency modulation composite baseband signal to obtain the accurate frequency spectrum of each radio station signal,
furthermore, the bandwidth of a filter is set according to the effective bandwidth of the analog-to-digital converter, and the frequency range of the whole radio station is segmented; the receiver adjusts the starting frequency of each wave band, samples each wave band through the memory controller, and analyzes the sampling signal to be stored as frequency spectrum information. Specifically, the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal are analyzed one by one;
if the energy distribution range or the size of the currently analyzed frequency modulation composite baseband signal does not conform to the preset range obviously, the frequency position corresponding to the frequency modulation composite baseband signal is caused by an interference signal, the frequency position is identified as a false station, the frequency modulation composite baseband signal is deleted, and the next frequency modulation composite baseband signal analysis is continued; otherwise, carrying out the next judgment;
if the energy distribution of the currently analyzed frequency modulation composite baseband signal is between 0 and 15KHz, identifying the currently analyzed frequency modulation composite baseband signal as a single sound channel radio station, and continuing to analyze the next frequency modulation composite baseband signal; otherwise, carrying out the next judgment;
if the energy of the currently analyzed frequency modulation composite baseband signal has a pilot signal at the position of 19KHz, and the energy distribution of 0-15KHz, 19KHz and 23KHz-53KHz accords with the stereo standard, identifying the signal as a stereo radio station, and continuing to analyze the next frequency modulation composite baseband signal; otherwise, carrying out the next judgment;
if other frequency bands have signals conforming to the characteristics, corresponding functions can be started in the decoder; otherwise, carrying out the next judgment;
if the radio does not support special functions, such as radio data broadcasting, the sampling bandwidth and the effective point can be reduced when the baseband signal is subjected to Fourier transform.
In this embodiment, a method of performing spectrum analysis on a frequency modulation broadcast signal is used to search and confirm a radio station, a fourier transformer is used to convert a frequency modulation time domain signal and a demodulated time domain signal into frequency spectrums, the frequency spectrums of the whole frequency modulation broadcast band are counted, a position which is possibly a radio station can be quickly located, in addition, a harmonic interference position can be analyzed to remove a duplicate station, the frequency spectrums of the demodulated composite baseband signal are analyzed, and whether the frequency point is a frequency modulation radio station or not is accurately judged based on the obvious characteristics of the frequency spectrums.
Example two
Fig. 2 shows an implementation process of the automatic channel searching method for the radio device according to the second embodiment of the present invention, which is detailed as follows:
in step S201, the whole station frequency range is segmented, and the receiver adjusts the starting frequency of each band to obtain the spectrum information of the corresponding band.
In this embodiment, the segmenting the frequency range of the whole radio station, and the adjusting the receiver to the starting frequency of each band, the acquiring the spectrum information of the corresponding band specifically includes:
setting the bandwidth of a filter according to the effective bandwidth of the analog-to-digital converter, and segmenting the frequency range of the whole radio station;
the receiver adjusts the starting frequency of each wave band, samples each wave band through the memory controller, and analyzes the sampling signal to be stored as frequency spectrum information.
In step S202, the spectrum information of each band is combined into a full-band spectrum energy table and stored.
In step S203, the spectrum information is analyzed one by one to obtain a plurality of pre-selected station frequencies.
In this embodiment, the analyzing the spectrum information one by one to obtain a plurality of frequencies of the pre-selected radio specifically includes:
acquiring energy peak positions according to the frequency spectrum information of each wave band;
screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold;
and detecting the frequency positions of the possible radio stations through a preset heavy station model, eliminating heavy stations and acquiring a plurality of preselected radio station frequencies.
In step S204, the demodulator is turned on to demodulate each preset station frequency, and the frequency modulation composite baseband signal obtained by demodulation is acquired and stored.
In step S205, a discrete fourier transformer is invoked to analyze each fm composite baseband signal, so as to obtain an accurate frequency spectrum of each radio station signal.
In the embodiment, the radio station is searched and confirmed by adopting a method of carrying out spectrum analysis on the frequency modulation broadcast signal, the Fourier transformer is utilized to convert the frequency modulation time domain signal and the demodulated time domain signal into the frequency spectrum, the frequency spectrum of the whole frequency modulation broadcast wave band is counted, the position which is possibly the radio station can be quickly positioned, in addition, the position of harmonic interference can be analyzed to remove the repeated station, and thus, the automatic channel searching is accurately realized.
EXAMPLE III
Fig. 3 shows an implementation flow of an automatic channel searching method for a radio device provided by the third embodiment of the present invention, which is detailed as follows:
in step S301, the frequency range of the whole radio station is segmented, and the receiver adjusts the starting frequency of each band to obtain the spectrum information of the corresponding band.
In this embodiment, the segmenting the frequency range of the whole radio station, and the adjusting the receiver to the starting frequency of each band, the acquiring the spectrum information of the corresponding band specifically includes:
setting the bandwidth of a filter according to the effective bandwidth of the analog-to-digital converter, and segmenting the output signal of the phase-locked loop;
the memory controller samples each band and uses the sampled signal as spectrum information.
In step S302, the spectrum information of each band is combined into a full-band spectrum energy table and stored.
In step S303, the spectrum information is analyzed one by one to obtain a plurality of pre-selected station frequencies.
In this embodiment, the analyzing the spectrum information one by one to obtain a plurality of frequencies of the pre-selected radio specifically includes:
acquiring energy peak positions according to the frequency spectrum information of each wave band;
screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold;
and detecting the frequency positions of the possible radio stations through a preset heavy station model, eliminating heavy stations and acquiring a plurality of preselected radio station frequencies.
In step S304, the demodulator is turned on to demodulate each preset station frequency, and the frequency modulation composite baseband signal obtained by demodulation is acquired and stored.
In step S305, a discrete fourier transformer is invoked to analyze each fm composite baseband signal, so as to obtain an accurate frequency spectrum of each radio station signal.
In step S306, the spectral distribution characteristics of each fm complex baseband signal are analyzed, and the accurate frequency spectrum of each radio station signal is reviewed.
In this embodiment, the analyzing the spectrum distribution characteristic of each fm composite baseband signal and reviewing the accurate spectrum of each radio station signal specifically includes:
analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal one by one;
if the energy distribution range or amplitude characteristic of the currently analyzed frequency modulation composite baseband signal obviously does not accord with the preset standard, the frequency position corresponding to the frequency modulation composite baseband signal is caused by an interference signal, the frequency position is identified as a false station, the frequency record of the station is deleted, and the frequency modulation composite baseband signal of the next station frequency is continuously analyzed; otherwise, carrying out the next judgment;
if the energy distribution of the currently analyzed frequency modulation composite baseband signal is between 0 and 15KHz, identifying the currently analyzed frequency modulation composite baseband signal as a single sound channel radio station, and continuing to analyze the next frequency modulation composite baseband signal; otherwise, carrying out the next judgment;
if the energy of the currently analyzed frequency modulation composite baseband signal has a pilot signal at the position of 19KHz, and the energy distribution of 0-15KHz, 19KHz and 23KHz-53KHz accords with the stereo standard, identifying the signal as a stereo radio station, and continuing to analyze the next frequency modulation composite baseband signal; otherwise, carrying out the next judgment;
if other frequency bands have signals conforming to the characteristics, corresponding functions can be started in the decoder; otherwise, carrying out the next judgment;
if the radio does not support special functions, such as radio data broadcasting, the sampling bandwidth and the effective point can be reduced when the baseband signal is subjected to Fourier transform.
In step S307, the accurate frequency spectrum of the fm complex baseband signal of each station obtained by the review is stored, and the accurate frequency spectrum is used as the characteristic of the corresponding station.
In this embodiment, the frequency spectrum of the demodulated composite baseband signal is further analyzed, and whether the frequency point is a frequency modulation radio station can be very accurately determined based on the obvious characteristics of the frequency spectrum.
Example four
Fig. 4 shows a specific structural block diagram of an automatic channel searching apparatus for a radio device according to a fourth embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown. In this embodiment, the automatic channel searching apparatus for radio equipment includes: a segment scanning unit 41, a spectrum holding unit 42, a station initial selection unit 43, a baseband signal acquisition unit 44, and a station acquisition unit 45.
The segmentation scanning unit 41 is configured to segment the frequency range of the whole radio station, and the receiver adjusts the starting frequency of each band to obtain frequency spectrum information of a corresponding band;
a spectrum storing unit 42, configured to combine the spectrum information of each band into a full-band spectrum energy table and store the full-band spectrum energy table;
a radio station primary selection unit 43, configured to analyze the frequency spectrum information one by one to obtain a plurality of pre-selected radio station frequencies;
a baseband signal obtaining unit 44, configured to turn on a demodulator to demodulate each preset radio frequency, and obtain and store a frequency modulation composite baseband signal obtained by demodulation;
and the radio station acquisition unit 45 is configured to invoke a discrete fourier transformer to analyze each frequency modulation composite baseband signal, so as to obtain an accurate frequency spectrum of each radio station signal.
Further, the segment scanning unit 41 includes:
a signal segmentation template 411, configured to set a filter bandwidth according to an effective bandwidth of the analog-to-digital converter, and segment the entire radio station frequency range;
the spectrum acquisition module 412 is used for the receiver to adjust to the starting frequency of each band, sample each band through the memory controller, and analyze the sampled signal as spectrum information to be stored.
Further, the station initial selection unit 43 includes:
a peak obtaining module 431, configured to obtain an energy peak position according to the spectrum information of each band;
a radio station screening module 432, configured to screen frequency positions of possible radio stations according to the energy peak position and a preset low noise threshold;
and the heavy station rejection module 433 is used for detecting the frequency positions of the possible radio stations through a preset heavy station model, rejecting heavy stations and acquiring frequencies of a plurality of preselected radio stations.
The automatic channel searching device for the radio equipment provided by the embodiment of the invention can be applied to the first corresponding method embodiment, and for details, reference is made to the description of the first embodiment, and details are not repeated here.
EXAMPLE five
Fig. 5 shows a specific structural block diagram of an automatic channel searching apparatus for a radio device according to a fifth embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown. In this embodiment, the automatic channel searching apparatus for radio equipment includes: a segment scanning unit 51, a spectrum saving unit 52, a station primary selection unit 53, a baseband signal acquisition unit 54, a station acquisition unit 55, a station review unit 56, and a feature saving unit 57.
The segmentation scanning unit 51 is configured to segment the frequency range of the whole radio station, and the receiver adjusts the starting frequency of each band to obtain frequency spectrum information of the corresponding band;
a spectrum storing unit 52, configured to combine the spectrum information of each band into a full-band spectrum energy table and store the full-band spectrum energy table;
a radio station primary selection unit 53, configured to analyze the frequency spectrum information one by one to obtain a plurality of pre-selected radio station frequencies;
a baseband signal obtaining unit 54, configured to turn on a demodulator to demodulate each preset radio frequency, and obtain and store a frequency modulation composite baseband signal obtained by demodulation;
and the radio station acquisition unit 55 is configured to invoke a discrete fourier transformer to analyze each fm composite baseband signal, so as to obtain an accurate frequency spectrum of each radio station signal.
Further, the segment scanning unit 51 includes:
a signal segmentation template 511, configured to set a filter bandwidth according to an effective bandwidth of the analog-to-digital converter, and segment the frequency range of the entire radio station;
and the spectrum acquisition template 512 is used for adjusting the receiver to the starting frequency of each wave band, sampling each wave band through the memory controller, and analyzing the sampling signal to be stored as spectrum information.
Further, the station initial selection unit 53 includes:
a peak obtaining module 531, configured to obtain energy peak positions according to the spectrum information of each band;
a radio station screening module 532, configured to screen frequency positions of possible radio stations according to the energy peak position and a preset low noise threshold;
and a heavy station rejecting module 533, configured to detect frequency positions of the possible radio stations through a preset heavy station model, reject heavy stations, and obtain frequencies of multiple pre-selected radio stations.
Further, the apparatus further comprises:
a radio station review unit 56, configured to analyze a spectrum distribution characteristic of each fm composite baseband signal, and review an accurate spectrum of each radio station signal;
and the characteristic storage unit 57 is configured to store the accurate frequency spectrum of the fm composite baseband signal of each radio station obtained through the review, and use the accurate frequency spectrum as the characteristic of the corresponding radio station.
Further, the station review unit 56 includes:
a characteristic analysis module 561, configured to analyze the spectrum distribution characteristics of each frequency modulated composite baseband signal one by one;
a false station deleting module 562, configured to delete the radio station frequency record if the currently analyzed characteristic of the energy distribution range or amplitude of the fm composite baseband signal obviously does not meet the preset standard, where the frequency position corresponding to the fm composite baseband signal is caused by an interference signal, and identify the frequency position as a false station, and continue to analyze the fm composite baseband signal of the next radio station frequency; otherwise, executing a single sound track radio station identification module;
a monaural radio station identification module 563 configured to identify the current analyzed fm composite baseband signal as a monaural radio station if the energy distribution of the current analyzed fm composite baseband signal is between 0-15KHz, and continue to analyze a next fm composite baseband signal; otherwise, executing a stereo radio station identification module;
a stereo station identification module 564, configured to identify a stereo station if there is a pilot signal at a position of 19KHz in the energy of the currently analyzed fm composite baseband signal, and energy distributions of 0-15KHz, 19KHz, and 23KHz-53KHz meet a stereo standard, and continue to analyze a next fm composite baseband signal; otherwise, carrying out the next judgment;
if other frequency bands have signals conforming to the characteristics, corresponding functions can be started in the decoder; otherwise, carrying out the next judgment;
if the radio does not support special functions, such as radio data broadcasting, the sampling bandwidth and the effective point can be reduced when the baseband signal is subjected to Fourier transform.
The automatic channel searching device for the radio equipment provided by the embodiment of the invention can be applied to the second corresponding method embodiment, and for details, reference is made to the description of the second embodiment, and details are not repeated here.
Notably, one of ordinary skill in the art will understand that: the steps or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, the program may be stored in a computer-readable storage medium, and when executed, the program performs the steps including the above method embodiments, and the storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. An automatic channel searching method for radio equipment is characterized by comprising the following steps:
segmenting the frequency range of the whole radio station, and adjusting the receiver to the starting frequency of each wave band to obtain the frequency spectrum information of the corresponding wave band;
the spectrum information of each wave band is combined into a full-wave band spectrum energy table and stored;
analyzing the frequency spectrum information one by one to obtain a plurality of pre-selection radio station frequencies;
starting a demodulator to demodulate each preset radio station frequency, and acquiring and storing a frequency modulation composite baseband signal obtained by demodulation;
a discrete Fourier transformer is used for analyzing each frequency modulation composite baseband signal to obtain the accurate frequency spectrum of each radio station signal;
the analyzing the frequency spectrum information one by one to obtain a plurality of pre-selected radio station frequencies specifically comprises:
acquiring energy peak positions according to the frequency spectrum information of each wave band;
screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold;
and detecting the frequency positions of the possible radio stations through a preset heavy station model, eliminating heavy stations and acquiring a plurality of preselected radio station frequencies.
2. The automatic channel searching method for radio equipment as claimed in claim 1, wherein the step of segmenting the whole radio station frequency range, adjusting the receiver to the starting frequency of each band, and acquiring the spectrum information of the corresponding band comprises:
setting the bandwidth of a filter according to the effective bandwidth of the analog-to-digital converter, and segmenting the frequency range of the whole radio station;
the receiver adjusts the starting frequency of each wave band, samples each wave band through the memory controller, and analyzes the sampling signal to be stored as frequency spectrum information.
3. The automatic channel searching method for the radio equipment according to any one of claims 1-2, characterized in that the method further comprises:
analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal, and rechecking the accurate frequency spectrum of each radio station signal;
and storing the accurate frequency spectrum of the frequency modulation composite baseband signal of each radio station obtained through rechecking, and taking the accurate frequency spectrum as the characteristic of the corresponding radio station.
4. The automatic channel searching method for radio equipment as claimed in claim 3, wherein said analyzing the spectral distribution characteristics of each FM composite baseband signal, and reviewing the exact spectrum of each station signal comprises:
analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal one by one;
if the energy distribution range or amplitude characteristic of the currently analyzed frequency modulation composite baseband signal does not meet the preset standard, identifying the frequency position corresponding to the frequency modulation composite baseband signal caused by an interference signal as a false station, deleting the frequency record of the station, and continuously analyzing the frequency modulation composite baseband signal of the next station frequency;
if the energy distribution of the currently analyzed frequency modulation composite baseband signal is between 0 and 15KHz, identifying the currently analyzed frequency modulation composite baseband signal as a single sound channel radio station, and continuing to analyze the next frequency modulation composite baseband signal;
if the energy of the currently analyzed FM composite baseband signal has a pilot signal at the position of 19KHz, and the energy distribution of 0-15KHz, 19KHz and 23KHz-53KHz are in accordance with the stereo standard, identifying the signal as a stereo radio station, and continuing to analyze the next FM composite baseband signal.
5. An automatic channel searching device for radio equipment is characterized by comprising:
the segmented scanning unit is used for segmenting the frequency range of the whole radio station, and the receiver adjusts the initial frequency of each wave band to obtain the frequency spectrum information of the corresponding wave band;
the spectrum storage unit is used for forming the spectrum information of each waveband into a full-waveband spectrum energy table and storing the full-waveband spectrum energy table;
the radio station primary selection unit is used for analyzing the frequency spectrum information one by one to obtain a plurality of pre-selected radio station frequencies;
the base band signal acquisition unit is used for starting the demodulator to demodulate each preset radio station frequency, and acquiring and storing the frequency modulation composite base band signal obtained by demodulation;
the radio station acquisition unit is used for calling a discrete Fourier transformer to analyze each frequency modulation composite baseband signal and obtain the accurate frequency spectrum of each radio station signal;
the radio station primary selection unit comprises:
the peak obtaining module is used for obtaining energy peak positions according to the frequency spectrum information of each wave band;
the radio station screening module is used for screening the frequency positions of possible radio stations according to the energy peak positions and a preset low-noise threshold;
and the heavy station rejection module is used for detecting the frequency positions of the possible radio stations through a preset heavy station model, rejecting the heavy stations and acquiring the frequencies of a plurality of preselected radio stations.
6. The automatic channel searching device for the radio equipment as claimed in claim 5, wherein the segment scanning unit comprises:
the signal segmentation template is used for setting the bandwidth of a filter according to the effective bandwidth of the analog-to-digital converter and segmenting the frequency range of the whole radio station;
and the frequency spectrum acquisition template is used for adjusting the receiver to the starting frequency of each wave band, sampling each wave band through the memory controller, and analyzing the sampling signal as frequency spectrum information for storage.
7. The automatic channel searching device for the radio equipment as claimed in any one of claims 5 to 6, wherein the device further comprises:
the radio station rechecking unit is used for analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal and rechecking the accurate frequency spectrum of each radio station signal;
and the characteristic storage unit is used for storing the accurate frequency spectrum of the frequency modulation composite baseband signal of each radio station obtained through rechecking and taking the accurate frequency spectrum as the characteristic of the corresponding radio station.
8. The automatic channel searching device for radio equipment as claimed in claim 7, wherein the station review unit comprises:
the characteristic analysis module is used for analyzing the frequency spectrum distribution characteristics of each frequency modulation composite baseband signal one by one;
a false station deleting module, configured to, if a feature of an energy distribution range or an amplitude of a currently analyzed fm composite baseband signal does not meet a preset standard, identify a frequency position corresponding to the fm composite baseband signal as a false station due to an interference signal, delete the radio station frequency record, and continue to analyze an fm composite baseband signal of a next radio station frequency;
the monaural radio station identification module is used for identifying the current analyzed FM composite baseband signal as a monaural radio station if the energy distribution of the current analyzed FM composite baseband signal is between 0 and 15KHz, and continuing to analyze the next FM composite baseband signal;
and the stereo radio station identification module is used for identifying a stereo radio station if the energy of the currently analyzed frequency modulation composite baseband signal has a pilot signal at the position of 19KHz and the energy distribution of 0-15KHz, 19KHz and 23KHz-53KHz accords with the stereo standard, and continuing to analyze the next frequency modulation composite baseband signal.
9. A radio receiver is characterized in that the radio receiver comprises a radio receiving circuit, the circuit comprises a phase-locked loop, a filter, a demodulator, a memory controller and a discrete Fourier transformer;
the memory controller is used for storing the radio station signals;
the memory controller is also used for controlling and executing the automatic channel searching method of the radio equipment as claimed in any one of claims 1 to 4.
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| CN118555351B (en) * | 2024-07-30 | 2024-10-15 | 北京七星华创微波电子技术有限公司 | S wave band phase discriminator of tuning in a large scale |
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| CN105376004B (en) * | 2014-07-31 | 2018-07-10 | 展讯通信（上海）有限公司 | A kind of adaptive tuning device and method and FM receiver |
| CN104243077A (en) * | 2014-08-26 | 2014-12-24 | 惠州市凯越电子有限公司 | Anti-interference automatic channel search method and device for radio receiver |
| CN105812080B (en) * | 2014-12-31 | 2019-04-26 | 展讯通信（上海）有限公司 | A kind of automatic searcher of radio signals and method and FM receiver |
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| CN105516798B (en) * | 2015-12-17 | 2019-03-01 | 深圳Tcl数字技术有限公司 | Television terminal channel search method and system |
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