CN105516798B - Television terminal channel search method and system - Google Patents
Television terminal channel search method and system Download PDFInfo
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- CN105516798B CN105516798B CN201510952919.5A CN201510952919A CN105516798B CN 105516798 B CN105516798 B CN 105516798B CN 201510952919 A CN201510952919 A CN 201510952919A CN 105516798 B CN105516798 B CN 105516798B
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- 238000010183 spectrum analysis Methods 0.000 claims abstract description 47
- 238000001228 spectrum Methods 0.000 claims description 35
- 238000013316 zoning Methods 0.000 claims description 5
- 230000001427 coherent effect Effects 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
The invention discloses a kind of television terminal channel search methods, this method comprises: obtaining the frequency range section of the received radiofrequency signal of television terminal when detecting tuning instruction；Frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section；Spectrum analysis is carried out to the radiofrequency signal in frequency sub-band section one by one, obtains the vision carrier frequency point in the spectrogram in each frequency sub-band section；Tuning is carried out according to each vision carrier frequency point, is channel carrier frequency point by the frequency point setting after tuning confirms.Invention additionally discloses a kind of television terminal channel searching systems.The present invention successively carries out spectrum analysis to the frequency sub-band section of pre-set bandwidths, quick obtaining vision carrier frequency point therein simultaneously sets channel carrier frequency point for the vision carrier frequency point, it avoids that each of frequency range section frequency point is analyzed and demodulated, the time for saving television terminal tuning improves the efficiency of television terminal tuning.
Description
Technical field
The present invention relates to TV tuning technical field more particularly to a kind of television terminal channel search method and systems.
Background technique
With the development of science and technology, television terminal (such as LCD TV) has obtained widely available, television terminal is gradually
It is appeared in each family as indispensable household electrical appliance.People generally require control television terminal and carry out tuning and save frequency
Road could be watched TV program by television terminal, and still, the tuning principle of television terminal currently on the market is based on time domain
Analysis, is analyzed and is demodulated one by one to the Frequency point on received radiofrequency signal full frequency band, wastes the plenty of time to not being
The Frequency point (i.e. non-image carrier frequency point) of vision carrier frequency is analyzed and is demodulated, and television terminal is caused to carry out a full frequency band frequency point
Tuning needs take a long time, and lead to television terminal tuning inefficiency.
Summary of the invention
The main purpose of the present invention is to provide a kind of television terminal channel search method and systems, it is intended to it is whole to solve existing TV
The technical issues of holding tuning inefficiency.
To achieve the above object, a kind of television terminal channel search method provided by the invention, the television terminal channel search method
Include:
When detecting tuning instruction, the frequency range section of the received radiofrequency signal of television terminal is obtained；
The frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section；
Spectrum analysis is carried out to the radiofrequency signal in the frequency sub-band section one by one, obtains the frequency in each frequency sub-band section
Vision carrier frequency point in spectrogram；
Tuning is carried out according to each described image carrier frequency point, sets channel carrier frequency for the carrier frequency point after tuning confirms
Point.
Preferably, described that tuning is carried out according to each described image carrier frequency point, by the load frequency point setting after tuning confirms
Include: for the step of channel carrier frequency point
With default fine tuning step-length, all frequency points in the default fine tuning bandwidth range of each described image carrier frequency point are solved
It adjusts；
It is channel load by the maximum frequency point setting of signal strength in the default fine tuning bandwidth range of each described image carrier frequency point
Frequency point.
Preferably, described when detecting tuning instruction, obtain the frequency range section of the received radiofrequency signal of television terminal
Step includes:
When detecting tuning instruction, the corresponding national information in current location locating for television terminal is obtained；
According to the national information of acquisition, corresponding frequency range section is obtained, is currently connect using the frequency range section as television terminal
The frequency range section of the radiofrequency signal of receipts.
Preferably, described that spectrum analysis is carried out to the radiofrequency signal in the frequency sub-band section one by one, obtain each son
The step of vision carrier frequency point in the spectrogram in frequency range section includes:
Spectrum analysis is carried out to the radiofrequency signal in the frequency sub-band section one by one, the Frequency point in the frequency sub-band section
With signal spectrum, using the Frequency point as potential frequency point；
If being spaced the Frequency point that the potential frequency point presets frequency range interval also has signal spectrum, the potential frequency point is set
The vision carrier frequency point in spectrogram for vision carrier frequency point, to obtain each frequency sub-band section.
Preferably, described by the frequency range interval division is that signal bandwidth is pre-set bandwidths and continuously distributed frequency sub-band area
Between the step of include:
The received radiofrequency signal of television terminal is filtered by bandpass filter；
The radiofrequency signal for exporting pre-set bandwidths one by one, using by the frequency range interval division as pre-set bandwidths and continuously distributed
Frequency sub-band section.
To achieve the above object, the present invention also provides a kind of television terminal channel searching system, the television terminal channel searching systems
Include:
Section obtains module, for obtaining the frequency range of the received radiofrequency signal of television terminal when detecting tuning instruction
Section；
The frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section by interval division module；
Spectrum analysis module carries out spectrum analysis to the radiofrequency signal in the frequency sub-band section one by one, obtains each described
Vision carrier frequency point in the spectrogram in frequency sub-band section；
Channel setup module, for carrying out tuning according to each described image carrier frequency point, by the frequency point after tuning confirms
It is set as channel carrier frequency point.
Preferably, the channel setup module includes:
Fine-adjusting unit, for presetting institute in fine tuning bandwidth range to each described image carrier frequency point with default fine tuning step-length
There is frequency point to be demodulated；
Setting unit, for each described image carrier frequency point to be preset the maximum frequency point of signal strength in fine tuning bandwidth range
It is set as channel carrier frequency point.
Preferably, the section acquisition module includes:
First acquisition unit, for it is corresponding to obtain current location locating for television terminal when detecting tuning instruction
National information；
Second acquisition unit obtains corresponding frequency range section for the national information according to acquisition, which is made
For the frequency range section of the currently received radiofrequency signal of television terminal.
Preferably, the spectrum analysis module includes:
First analytical unit carries out spectrum analysis for the radiofrequency signal one by one to the frequency sub-band section, when the son
Frequency point in frequency range section has signal spectrum, using the Frequency point as potential frequency point；
Second analytical unit, if also there is signal spectrum for being spaced the Frequency point that the potential frequency point presets frequency range interval,
The potential frequency point is then set as vision carrier frequency point, the vision carrier frequency in spectrogram to obtain each frequency sub-band section
Point.
Preferably, the interval division module includes:
Filter unit, for being filtered by bandpass filter to the received radiofrequency signal of television terminal；
The frequency range interval division is default band for exporting the radiofrequency signal of pre-set bandwidths one by one by zoning unit
Wide and continuously distributed frequency sub-band section.
The present invention is by obtaining the frequency range section of the received radiofrequency signal of television terminal when detecting tuning instruction；So
Frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section afterwards；And one by one to the radiofrequency signal in frequency sub-band section
Spectrum analysis is carried out, the vision carrier frequency point in the spectrogram in each frequency sub-band section is obtained；Finally according to each vision carrier frequency point
Tuning is carried out, is channel carrier frequency point by the frequency point setting after tuning confirms, thus successively to the frequency sub-band section of pre-set bandwidths
Spectrum analysis is carried out, quick obtaining vision carrier frequency point therein simultaneously sets channel carrier frequency point for the vision carrier frequency point, avoids pair
Each of frequency range section frequency point is analyzed and is demodulated, and is saved the time of television terminal tuning, is improved television terminal
The efficiency of tuning.
Detailed description of the invention
Fig. 1 is the flow diagram of television terminal channel search method first embodiment of the present invention；
Fig. 2 is to carry out tuning according to each vision carrier frequency point in television terminal channel search method second embodiment of the present invention, will
The refinement flow diagram for the step of frequency point setting after tuning confirms is channel carrier frequency point；
Fig. 3 is in television terminal channel search method 3rd embodiment of the present invention when detecting tuning instruction, and acquisition TV is whole
The refinement flow diagram for the step of holding the frequency range section of received radiofrequency signal；
Fig. 4 is to carry out one by one to the radiofrequency signal in frequency sub-band section in television terminal channel search method fourth embodiment of the present invention
Spectrum analysis, the refinement flow diagram for the step of obtaining the vision carrier frequency point in the spectrogram in each frequency sub-band section；
It by frequency range interval division is pre-set bandwidths and continuous that Fig. 5, which is in the 5th embodiment of television terminal channel search method of the present invention,
The refinement flow diagram of the step of frequency sub-band section of distribution；
Fig. 6 is the functional block diagram of television terminal channel searching system first embodiment of the present invention；
The refinement functional module of Fig. 7 television terminal channel searching system second embodiment mid band setup module of the present invention is illustrated
Figure；
Section obtains the refinement functional module signal of module in Fig. 8 television terminal channel searching system 3rd embodiment of the present invention
Figure；
The refinement functional module signal of spectrum analysis module in Fig. 9 television terminal channel searching system fourth embodiment of the present invention
Figure；
The refinement functional module signal of interval division module in Figure 10 the 5th embodiment of television terminal channel searching system of the present invention
Figure.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of television terminal channel search method, in the first embodiment of television terminal channel search method of the present invention
In, referring to Fig.1, which includes:
Step S10 obtains the frequency range section of the received radiofrequency signal of television terminal when detecting tuning instruction；
When user executes tuning operation to television terminal, such as user presses the tuning key of remote controler, and television terminal produces
Raw tuning instruction.Television terminal channel searching system real-time detection television terminal whether generate tuning instruction, when detect tuning instruct
When, show that user needs television terminal to carry out tuning, obtains the frequency range section of the received radiofrequency signal of television terminal at this time, that is, penetrate
The frequency range section for the radiofrequency signal that frequency signal input part is inputted to television terminal, such as the frequency range section of China full frequency band is
43MHz to 866MHz.
Frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section by step S20；
The frequency range section for the radiofrequency signal for being input to television terminal is segmented, it is therefore an objective to convenient for the radiofrequency signal into
Line frequency spectrum analysis, because PAL-D/K standard a channel bandwidth definition be 8MHz, can set herein pre-set bandwidths as
40MHz, that is, there is 5 channel bandwidths that can be analyzed in spectrum analysis module simultaneously, it is pre- for dividing frequency range section
If bandwidth and there is bandpass filter completion in continuously distributed frequency sub-band section.For example, the frequency of the received radiofrequency signal of television terminal
Section section is 49.75MHz to 209.75MHz, pre-set bandwidths 40MHz, then the frequency range interval division is continuously distributed four
Frequency sub-band section is respectively as follows: 49.75MHz to 89.75MHz, 89.75MHz to 129.75MHz, 129.75MHz extremely
169.75MHz, 169.75MHz to 209.75MHz.In addition, pre-set bandwidths can be the integral multiple of channel bandwidth.It is understood that
Be, frequency range section divide can according to television system difference and changed accordingly.
Step S30 carries out spectrum analysis to the radiofrequency signal in frequency sub-band section one by one, obtains the frequency in each frequency sub-band section
Vision carrier frequency point in spectrogram；
Spectrum analysis is carried out to the radiofrequency signal in all frequency sub-band sections one by one, i.e., the radio frequency in each subchannel section is believed
Number (i.e. complicated time history waveform) carries out Fourier transformation and is decomposed into several single harmonic components to study, to obtain letter
Number frequency structure and each harmonic wave and phase information, and according in the spectrogram in each frequency sub-band section of these acquisition of information
Vision carrier frequency point.For example, first using the Frequency point on spectrogram with spectrum signal as potential frequency point, if it is potential to be then spaced this
The Frequency point at frequency point predeterminated frequency interval (frequency interval of sound carrier frequency) also has spectrum signal, then using the potential frequency point as
Vision carrier frequency point.In addition, vision carrier frequency point can be centrally saved in frequency point list.
Step S40 carries out tuning according to each vision carrier frequency point, is channel carrier frequency by the frequency point setting after tuning confirms
Point.
Tuning is carried out to the frequency range section near the vision carrier frequency point in each frequency sub-band section, that is confirmed through tuning
Carrier frequency point afterwards is set as channel carrier frequency point, i.e. user switches to these channel carrier frequency points by control television terminal and can see
See corresponding TV programme.
In the present embodiment, by obtaining the frequency range of the received radiofrequency signal of television terminal when detecting tuning instruction
Section；Then frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section；And one by one to frequency sub-band section
Radiofrequency signal carries out spectrum analysis, obtains the vision carrier frequency point in the spectrogram in each frequency sub-band section；Finally according to each figure
As carrier frequency point progress tuning, channel carrier frequency point is set by the carrier frequency point after tuning confirms, thus successively to pre-set bandwidths
Frequency sub-band section carries out spectrum analysis, and quick obtaining vision carrier frequency point therein simultaneously sets channel carrier frequency for the vision carrier frequency point
Point avoids that each of frequency range section frequency point is analyzed and demodulated, saves the time of television terminal tuning, improve
The efficiency of television terminal tuning.
Further, on the basis of television terminal channel search method first embodiment of the present invention, television terminal tuning is proposed
Method second embodiment, referring to Fig. 2, in a second embodiment, step S40 includes:
Step S41 carries out all frequency points in the default fine tuning bandwidth range of each vision carrier frequency point with default fine tuning step-length
Demodulation；
The maximum frequency point setting of signal strength in the default fine tuning bandwidth range of each vision carrier frequency point is frequency by step S42
Road carrier frequency point.
Since each channel number of tv channel list and corresponding vision carrier frequency are one-to-one and are fixed and invariable
(for example the vision carrier frequency of the channel 1 of PAL-D/K standard is 49.75MHz), and due to television terminal hardware difference, spectrum analysis
There may be certain deviations for the factors such as error, the vision carrier frequency point obtained by spectrum analysis and real image carrier frequency point, no
It is especially accurately, to need to carry out fine tuning；If i.e. through the resulting vision carrier frequency point of spectrum analysis directly as channel carrier frequency point,
Television terminal watches TV program, and there may be unintelligible, images the phenomenon that interference snow.Fine tuning detailed process is such as
Under: a vision carrier frequency point is first selected, is solved in the default fine tuning bandwidth range of the vision carrier frequency point with default fine tuning step-length
It adjusts, the frequency point of select-out signal maximum intensity is as channel carrier frequency point；Then other vision carrier frequency points are similarly selected one by one nearby to believe
Number most strong frequency point of intensity is as other channel carrier frequency points.
For example, the first vision carrier frequency point selected, frequency 50.25MHz is preset if default fine tuning bandwidth is 1MHz
Fine tuning step-length be 0.25MHz, by non-coherent demodulation or coherent demodulation method with step-length 0.25MHz from 49.75MHz to
It is demodulated one by one (in the 1M bandwidth i.e. centered on 50.25) in 50.75MHz bandwidth, most according to the signal strength demodulated
Determine the maximum Frequency point of signal strength as channel carrier frequency point eventually.In addition, connecing this section of example, frequency 50.25MHz is preset
Fine tuning bandwidth is 1MHz, and presetting fine tuning step-length is 0.25MHz, according to the frequency distribution of tv channel list intermediate frequency Taoist monastic name, learns 1 frequency
The Frequency point 49.75MHz (by taking PAL-D/K standard as an example) and vision carrier frequency point 50.25MHz in road are closest, to pass through non-phase
Dry demodulation or coherent demodulation method by step-length 0.25MHz from 49.25MHz to 50.25MHz in bandwidth (i.e. centered on 49.75
In 1M bandwidth) it is demodulated one by one, finally determined the maximum Frequency point of signal strength as frequency according to the signal strength demodulated
Road carrier frequency point.
In the present embodiment, by further presetting fine tuning bandwidth to vision carrier frequency point after determining vision carrier frequency point
Frequency point in range is demodulated, and is selected the maximum frequency point of signal strength in the default fine tuning bandwidth of each vision carrier frequency point and is used as frequency
Road carrier frequency point, further improves the accuracy of channel carrier frequency point, improves television terminal according to channel carrier frequency program request placing TV
The video quality of program.
Further, on the basis of television terminal channel search method first embodiment of the present invention, television terminal tuning is proposed
Method 3rd embodiment, referring to Fig. 3, in the third embodiment, step S10 includes:
Step S11 obtains the corresponding national information in current location locating for television terminal when detecting tuning instruction；
Step S12 obtains corresponding frequency range section according to the national information of acquisition, using the frequency range section as TV end
Hold the frequency range section of currently received radiofrequency signal.
Since in different countries, the frequency range section of the radiofrequency signal for television terminal is not quite similar, such as China
Frequency range section is 43MHz to 866MHz, and Japanese frequency range section is 88MHz to 770MHz；So when detecting tuning instruction,
Current location locating for television terminal can be first obtained, and the corresponding country in television terminal present position is obtained according to current location
Information (such as national code)；According to the national information of acquisition, corresponding frequency range section is obtained, and using the frequency range section as TV
The frequency range section of the currently received radiofrequency signal of terminal.
In the present embodiment, by when detecting tuning instruction, first obtaining television terminal current location to corresponding state
Family's information, then obtains corresponding frequency range section according to national information, to avoid the frequency range section obtained and television terminal institute
Country frequency range section it is inconsistent, and then avoid frequency range section it is inconsistent caused by leakage platform phenomenon.
Further, on the basis of television terminal channel search method first embodiment of the present invention, television terminal tuning is proposed
Method fourth embodiment, referring to Fig. 4, in the fourth embodiment, step S30 includes:
Step S31 carries out spectrum analysis to the radiofrequency signal in frequency sub-band section one by one, the Frequency point in frequency sub-band section
With signal spectrum, using the Frequency point as potential frequency point；
Step S32, if being spaced the Frequency point that the potential frequency point presets frequency range interval also has signal spectrum, by potential frequency
Point is set as vision carrier frequency point, the vision carrier frequency point in spectrogram to obtain each frequency sub-band section.
Behind the frequency range section for determining the received radiofrequency signal of television terminal, from first, frequency range section frequency sub-band section
Start to carry out spectrum analysis to the radiofrequency signal in each frequency sub-band section one by one, which tool in the Frequency point in frequency sub-band section analyzed
There is signal spectrum；When the Frequency point in frequency sub-band section has signal spectrum, using the Frequency point as potential frequency point；Then into
One step judges to be spaced whether the Frequency point that potential frequency point presets frequency range interval also has signal spectrum；If it is pre- to be spaced the potential frequency point
If the Frequency point at frequency range interval also has signal spectrum, then potential frequency point being set as vision carrier frequency point, such cycle analysis judges,
Obtain the vision carrier frequency point in the spectrogram in each frequency sub-band section.Such as frequency sub-band section is in 49.75MHz to the area 89.75MHz
Between when, since the frequency interval of vision carrier frequency and sound carrier frequency is fixed as 6.5MHz, so be divided into 6.5MHz between setting default frequency range,
If 49.75MHz Frequency point has signal spectrum in frequency sub-band section, using the 49.75MHz Frequency point as potential frequency point, so
Further judge that the 56.25MHz Frequency point apart from Frequency point 6.5MHz also has signal spectrum, then can be determined that 49.75MHz afterwards
Frequency point is vision carrier frequency point, and so on, determine all vision carrier frequency points in all frequency sub-band sections.
In the present embodiment, spectrum analysis is carried out by the radiofrequency signal one by one to all frequency sub-band sections, first analyzed simultaneously
The potential frequency point in frequency sub-band section with signal spectrum is selected, then judges the frequency outside the default frequency range interval of potential frequency point
Whether point also has signal spectrum, is vision carrier frequency point by the potential frequency point setting of Rule of judgment is met, to pass through a kind of letter
Single, feasible mode realizes the spectrum analysis to radiofrequency signal and quickly and accurately selects vision carrier frequency point.
Further, on the basis of television terminal channel search method first embodiment of the present invention, television terminal tuning is proposed
The 5th embodiment of method, referring to Fig. 5, in the 5th embodiment, step S20 includes:
Step S21 is filtered the received radiofrequency signal of television terminal by bandpass filter；
Step S22, one by one export pre-set bandwidths radiofrequency signal, using by frequency range interval division be pre-set bandwidths and continuously divide
The frequency sub-band section of cloth.
Bandpass filter is that the wave of a permission special frequency channel passes through while the equipment that shields other frequency ranges, in television terminal
Portion is equipped with bandpass filter, behind the frequency range section for determining the received radiofrequency signal of television terminal, controls bandpass filter to electricity
It is filtered depending on the received radiofrequency signal of terminal, exports the radiofrequency signal of pre-set bandwidths one by one, frequency range section is divided into
For pre-set bandwidths and continuously distributed frequency sub-band section.One embodiment of concrete processing procedure is as follows: by the left side in frequency range section
Boundary value (such as frequency range section is 43MHz to 866MHz, then the left boundary value in frequency range section is 43MHz) is set as bandpass filtering
The initial frequency of device makes to be limited to by the radiofrequency signal of bandpass filter in pre-set bandwidths (such as 40MHz), that is, exports first
A frequency sub-band section (radiofrequency signal of 43MHz to 83MHz)；Then resetting the second frequency sub-band section, (83MHz is extremely
Left boundary value (i.e. 83MHz) 123MHz) is the new initial frequency of bandpass filter, makes the radiofrequency signal by bandpass filter
Be limited in pre-set bandwidths (such as 40MHz), that is, export second frequency sub-band section (radiofrequency signal of 83MHz to 123MHz),
So circulation, until television terminal whole frequency range section is completed in search, to be pre-set bandwidths and continuous by frequency range interval division
The frequency sub-band section of distribution.
In the present embodiment, the received radiofrequency signal of television terminal is filtered by using bandpass filter,
Constantly changing bandpass filter allows the frequency range by signal, and exports the radiofrequency signal of pre-set bandwidths one by one, by TV
The received radiofrequency signal frequency range interval division of terminal is pre-set bandwidths and continuously distributed frequency sub-band section, thus with a kind of letter
Mode that is single, being easily achieved realizes the subregion in frequency range section, to be conducive to carry out frequency spectrum to the signal in each frequency sub-band section
Analysis.
In addition, on the basis of television terminal channel search method of the present invention second, third or fourth embodiment,
Step S20 includes:
Step S21 is filtered the received radiofrequency signal of television terminal by bandpass filter；
Step S22, one by one export pre-set bandwidths radiofrequency signal, using by frequency range interval division be pre-set bandwidths and continuously divide
The frequency sub-band section of cloth.
The present invention also provides a kind of television terminal channel searching systems, in the first embodiment of television terminal channel searching system, ginseng
According to Fig. 6, which includes:
Section obtains module 10, for obtaining the frequency of the received radiofrequency signal of television terminal when detecting tuning instruction
Section section；
When user executes tuning operation to television terminal, such as user presses the tuning key of remote controler, and television terminal produces
Raw tuning instruction.Television terminal channel searching system real-time detection television terminal whether generate tuning instruction, when detect tuning instruct
When, show that user needs television terminal to carry out tuning, section obtains module 10 and obtains the received radiofrequency signal of television terminal at this time
Frequency range section, i.e. the frequency range section of radiofrequency signal that is inputted to television terminal of RF signal input end, such as China is complete
The frequency range section of frequency range is 43MHz to 866MHz.
Frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section by interval division module 20；
Interval division module 20 is segmented the frequency range section for the radiofrequency signal for being input to television terminal, it is therefore an objective to be convenient for
Spectrum analysis is carried out to the radiofrequency signal, because the bandwidth definition of a channel of PAL-D/K standard is 8MHz, can be set herein
Determining pre-set bandwidths is 40MHz, that is, there is 5 channel bandwidths that can be analyzed in spectrum analysis module simultaneously, is divided
Frequency range section is pre-set bandwidths and there is bandpass filter completion in continuously distributed frequency sub-band section.For example, television terminal is received
The frequency range section of radiofrequency signal is 49.75MHz to 209.75MHz, pre-set bandwidths 40MHz, then the frequency range interval division is to connect
Four frequency sub-band sections of continuous distribution, be respectively as follows: 49.75MHz to 89.75MHz, 89.75MHz to 129.75MHz,
129.75MHz is to 169.75MHz, 169.75MHz to 209.75MHz.In addition, pre-set bandwidths can be the integer of channel bandwidth
Times.It is understood that frequency range section divide can according to television system difference and changed accordingly.
Spectrum analysis module 30 carries out spectrum analysis to the radiofrequency signal in frequency sub-band section one by one, obtains each frequency sub-band
Vision carrier frequency point in the spectrogram in section；
Spectrum analysis module 30 carries out spectrum analysis to the radiofrequency signal in all frequency sub-band sections one by one, i.e., to each height frequency
The radiofrequency signal (i.e. complicated time history waveform) in road section carries out Fourier transformation and is decomposed into several single harmonic components
It studies, to obtain the frequency structure and each harmonic wave and phase information of signal, and according to each frequency sub-band of these acquisition of information
Vision carrier frequency point in the spectrogram in section.For example, first by the Frequency point on spectrogram with spectrum signal as potential frequency point,
If the Frequency point for being then spaced the potential frequency point predeterminated frequency interval (frequency interval of sound carrier frequency) also has spectrum signal,
Using the potential frequency point as vision carrier frequency point.In addition, vision carrier frequency point can be centrally saved in frequency point list.
Channel setup module 40 sets the frequency point after tuning confirms for carrying out tuning according to each vision carrier frequency point
It is set to channel carrier frequency point.
Channel setup module 40 carries out tuning to the frequency range section near the vision carrier frequency point in each frequency sub-band section, just
Like that carrier frequency point after tuning confirms is set as channel carrier frequency point, i.e. user switches to these frequencies by controlling television terminal
Road carrier frequency point can watch corresponding TV programme.
In the present embodiment, by the way that when detecting tuning instruction, it is received that section obtains the acquisition television terminal of module 10
The frequency range section of radiofrequency signal；Then frequency range interval division is pre-set bandwidths and continuously distributed son frequency by interval division module 20
Section section；Spectrum analysis module 30 carries out spectrum analysis to the radiofrequency signal in frequency sub-band section one by one, obtains each frequency sub-band area
Between spectrogram in vision carrier frequency point；Final channel setup module 40 carries out tuning according to each vision carrier frequency point, will be through searching
Carrier frequency point after platform confirmation is set as channel carrier frequency point, so that spectrum analysis successively is carried out to the frequency sub-band section of pre-set bandwidths,
Quick obtaining vision carrier frequency point therein simultaneously sets channel carrier frequency point for the vision carrier frequency point, avoids to every in frequency range section
One frequency point is analyzed and is demodulated, and the time of television terminal tuning is saved, and improves the efficiency of television terminal tuning.
Further, on the basis of television terminal channel searching system first embodiment of the present invention, television terminal tuning is proposed
System second embodiment, referring to Fig. 7, in a second embodiment, channel setup module 40 includes:
Fine-adjusting unit 41, for default fine tuning step-length, finely tune bandwidth range in default to each vision carrier frequency point to be owned
Frequency point is demodulated；
Setting unit 42, for setting the maximum frequency point of signal strength in the default fine tuning bandwidth range of each vision carrier frequency point
It is set to channel carrier frequency point.
Since each channel number of tv channel list and corresponding vision carrier frequency are one-to-one and are fixed and invariable
(for example the vision carrier frequency of the channel 1 of PAL-D/K standard is 49.75MHz), and due to television terminal hardware difference, spectrum analysis
There may be certain deviations for the factors such as error, the vision carrier frequency point obtained by spectrum analysis and real image carrier frequency point, no
It is especially accurately, to need to carry out fine tuning；If i.e. through the resulting vision carrier frequency point of spectrum analysis directly as channel carrier frequency point,
Television terminal watches TV program, and there may be unintelligible, images the phenomenon that interference snow.Fine tuning detailed process is such as
Under: a vision carrier frequency point is first selected, fine-adjusting unit 41 is in the default fine tuning bandwidth range of the vision carrier frequency point with default fine tuning
Step-length is demodulated, and the frequency point of 42 select-out signal maximum intensity of setting unit is as channel carrier frequency point；Then it similarly selects one by one
The most strong frequency point of signal strength is as other channel carrier frequency points near other vision carrier frequency points.
For example, the first vision carrier frequency point selected, frequency 50.25MHz is preset if default fine tuning bandwidth is 1MHz
Fine tuning step-length be 0.25MHz, by non-coherent demodulation or coherent demodulation method with step-length 0.25MHz from 49.75MHz to
It is demodulated one by one (in the 1M bandwidth i.e. centered on 50.25) in 50.75MHz bandwidth, most according to the signal strength demodulated
Determine the maximum Frequency point of signal strength as channel carrier frequency point eventually.In addition, connecing this section of example, frequency 50.25MHz is preset
Fine tuning bandwidth is 1MHz, and default fine tuning step-length learns one according to the frequency distribution of tv channel list intermediate frequency Taoist monastic name for 0.25MHz
The Frequency point 49.75MHz (by taking PAL-D/K standard as an example) and vision carrier frequency point 50.25MHz of channel are closest, thus by non-
Coherent demodulation or coherent demodulation method by step-length 0.25MHz from 49.25MHz to 50.25MHz in bandwidth (i.e. centered on 49.75
1M bandwidth in) demodulated one by one, according to the signal strength demodulated finally determine the maximum Frequency point conduct of signal strength
Channel carrier frequency point.
In the present embodiment, by the way that after determining vision carrier frequency point, fine-adjusting unit 41 is further pre- to vision carrier frequency point
If the frequency point in fine tuning bandwidth range is demodulated, setting unit 42 selects signal in the default fine tuning bandwidth of each vision carrier frequency point
The frequency point of maximum intensity further improves the accuracy of channel carrier frequency point, improves television terminal root as channel carrier frequency point
According to the video quality of channel carrier frequency program request placing TV program.
Further, on the basis of television terminal channel searching system first embodiment of the present invention, television terminal tuning is proposed
System 3rd embodiment, referring to Fig. 8, in the third embodiment, section obtains module 10 and includes:
First acquisition unit 11, for it is corresponding to obtain current location locating for television terminal when detecting tuning instruction
National information；
Second acquisition unit 12 obtains corresponding frequency range section for the national information according to acquisition, by the frequency range section
Frequency range section as the currently received radiofrequency signal of television terminal.
Since in different countries, the frequency range section of the radiofrequency signal for television terminal is not quite similar, such as China
Frequency range section is 43MHz to 866MHz, and Japanese frequency range section is 88MHz to 770MHz；So when detecting tuning instruction,
First acquisition unit 11 can be first passed through and obtain current location locating for television terminal, and television terminal is obtained according to current location
The corresponding national information in present position (such as national code)；Second acquisition unit 12 is obtained and is corresponded to according to the national information of acquisition
Frequency range section, and using the frequency range section as the frequency range section of the currently received radiofrequency signal of television terminal.
In the present embodiment, by the way that when detecting tuning instruction, it is current that first acquisition unit 11 first obtains television terminal
Position is to corresponding national information, and then second acquisition unit 12 obtains corresponding frequency range section according to national information, to keep away
Exempt from the frequency range section obtained and the frequency range section of television terminal the country in which it is located is inconsistent, and then avoids frequency range section inconsistent and draw
The leakage platform phenomenon risen.
Further, on the basis of television terminal channel searching system first embodiment of the present invention, television terminal tuning is proposed
System fourth embodiment, referring to Fig. 9, in the fourth embodiment, spectrum analysis module 30 includes:
First analytical unit 31 carries out spectrum analysis for the radiofrequency signal one by one to frequency sub-band section, when frequency sub-band area
Interior Frequency point has signal spectrum, using the Frequency point as potential frequency point；
Second analytical unit 32, if the Frequency point for presetting frequency range interval for being spaced the potential frequency point also has signal frequency
Spectrum, then be set as vision carrier frequency point for potential frequency point, the vision carrier frequency point in spectrogram to obtain each frequency sub-band section.
Behind the frequency range section for determining the received radiofrequency signal of television terminal, the first analytical unit 31 is from the frequency range section
One frequency sub-band section starts to carry out spectrum analysis to the radiofrequency signal in each frequency sub-band section one by one, analyzes in frequency sub-band section
Which has signal spectrum in Frequency point；When the Frequency point in frequency sub-band section have signal spectrum when, using the Frequency point as
Potential frequency point；Then the second analytical unit 32 further judges to be spaced whether the Frequency point that potential frequency point presets frequency range interval also has
There is signal spectrum；If being spaced the Frequency point that the potential frequency point presets frequency range interval also has signal spectrum, potential frequency point is set
For vision carrier frequency point, such cycle analysis judgement obtains the vision carrier frequency point in the spectrogram in each frequency sub-band section.Such as son
Frequency range section is when 49.75MHz is to the section 89.75MHz, since the frequency interval of vision carrier frequency and sound carrier frequency is fixed as
6.5MHz, so it is divided into 6.5MHz between setting default frequency range, if 49.75MHz Frequency point has signal spectrum in frequency sub-band section,
Using the 49.75MHz Frequency point as potential frequency point, the 56.25MHz frequency apart from Frequency point 6.5MHz is then further judged
Point also has signal spectrum, then can be determined that 49.75MHz Frequency point is vision carrier frequency point, and so on, determine all frequency sub-band areas
Interior all vision carrier frequency points.
In the present embodiment, frequency spectrum is carried out to the radiofrequency signal in all frequency sub-band sections one by one by the first analytical unit 31
Analysis is first analyzed and selects the potential frequency point in frequency sub-band section with signal spectrum, and then the judgement of the second analytical unit 32 is latent
Whether the Frequency point outside the default frequency range interval of frequency point also has signal spectrum, will meet the potential frequency point setting of Rule of judgment
For vision carrier frequency point, thus by a kind of simple, feasible mode realize spectrum analysis to radiofrequency signal and quickly, it is quasi-
Really select vision carrier frequency point.
Further, on the basis of television terminal channel searching system first embodiment of the present invention, television terminal tuning is proposed
The 5th embodiment of system, referring to Fig.1 0, in the 5th embodiment, interval division module 20 includes:
Filter unit 21, for being filtered by bandpass filter to the received radiofrequency signal of television terminal；
Zoning unit 22, for exporting the radiofrequency signal of pre-set bandwidths one by one, using by frequency range interval division as pre-set bandwidths
And continuously distributed frequency sub-band section.
Bandpass filter is that the wave of a permission special frequency channel passes through while the equipment that shields other frequency ranges, in television terminal
Portion is equipped with bandpass filter, and behind the frequency range section for determining the received radiofrequency signal of television terminal, filter unit 21 controls band logical
Filter is filtered the received radiofrequency signal of television terminal, and zoning unit 22 exports the radio frequency letter of pre-set bandwidths one by one
Number, frequency range section is divided into frequency sub-band section for pre-set bandwidths and continuously distributed.One embodiment of concrete processing procedure
As follows: by the left boundary value in frequency range section, (such as frequency range section is 43MHz to 866MHz, then the left boundary value in frequency range section is
It 43MHz) is set as the initial frequency of bandpass filter, makes to be limited to pre-set bandwidths (example by the radiofrequency signal of bandpass filter
Such as 40MHz) in, that is, export first frequency sub-band section (radiofrequency signal of 43MHz to 83MHz)；Then the second son is reset
(left boundary value (i.e. 83MHz) of 83MHz to 123MHz) is the new initial frequency of bandpass filter, is made by band logical in frequency range section
The radiofrequency signal of filter is limited in pre-set bandwidths (such as 40MHz), that is, exporting second frequency sub-band section, (83MHz is extremely
Radiofrequency signal 123MHz) so recycles, until television terminal whole frequency range section is completed in search, so that frequency range section be drawn
It is divided into pre-set bandwidths and continuously distributed frequency sub-band section.
In the present embodiment, the received radiofrequency signal of television terminal is filtered by using bandpass filter,
Constantly changing bandpass filter allows the frequency range by signal, and exports the radiofrequency signal of pre-set bandwidths one by one, by TV
The received radiofrequency signal frequency range interval division of terminal is pre-set bandwidths and continuously distributed frequency sub-band section, thus with a kind of letter
Mode that is single, being easily achieved realizes the subregion in frequency range section, to be conducive to carry out frequency spectrum to the signal in each frequency sub-band section
Analysis.
In addition, on the basis of television terminal channel searching system of the present invention second, third or fourth embodiment,
Interval division module 20 includes:
Filter unit 21, for being filtered by bandpass filter to the received radiofrequency signal of television terminal；
Zoning unit 22, for exporting the radiofrequency signal of pre-set bandwidths one by one, using by frequency range interval division as pre-set bandwidths
And continuously distributed frequency sub-band section.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, computer, clothes
Be engaged in device, air conditioner or the network equipment etc.) method that executes each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of television terminal channel search method, which is characterized in that the television terminal channel search method includes:
When detecting tuning instruction, the frequency range section of the received radiofrequency signal of television terminal is obtained；
The frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section；
Spectrum analysis is carried out to the radiofrequency signal in the frequency sub-band section one by one, when the Frequency point in the frequency sub-band section has
Signal spectrum, using the Frequency point as potential frequency point；
If being spaced the Frequency point that the potential frequency point presets frequency range interval also has signal spectrum, the potential frequency point is set as figure
As carrier frequency point, the vision carrier frequency point in spectrogram to obtain each frequency sub-band section；
Tuning is carried out according to each described image carrier frequency point, is channel carrier frequency point by the frequency point setting after tuning confirms.
2. television terminal channel search method as described in claim 1, which is characterized in that described according to each described image carrier frequency point
Tuning is carried out, the step of setting channel carrier frequency point for the carrier frequency point after tuning confirms includes:
With default fine tuning step-length, all frequency points in the default fine tuning bandwidth range of each described image carrier frequency point are demodulated；
It is channel carrier frequency point by the maximum frequency point setting of signal strength in the default fine tuning bandwidth range of each described image carrier frequency point.
3. television terminal channel search method as described in claim 1, which is characterized in that it is described when detecting tuning instruction, it obtains
The step of taking the frequency range section of the received radiofrequency signal of television terminal include:
When detecting tuning instruction, the corresponding national information in current location locating for television terminal is obtained；
According to the national information of acquisition, corresponding frequency range section is obtained, is currently connect using the frequency range section as television terminal
The frequency range section of the radiofrequency signal of receipts.
4. the television terminal channel search method as described in claims 1 to 3 any one, which is characterized in that described by the frequency range
Interval division is that the step of signal bandwidth is pre-set bandwidths and continuously distributed frequency sub-band section includes:
The received radiofrequency signal of television terminal is filtered by bandpass filter；
The radiofrequency signal for exporting pre-set bandwidths one by one, using by the frequency range interval division be pre-set bandwidths and continuously distributed son frequently
Section section.
5. a kind of television terminal channel searching system, which is characterized in that the television terminal channel searching system includes:
Section obtains module, for obtaining the frequency range section of the received radiofrequency signal of television terminal when detecting tuning instruction；
The frequency range interval division is pre-set bandwidths and continuously distributed frequency sub-band section by interval division module；
Spectrum analysis module carries out spectrum analysis to the radiofrequency signal in the frequency sub-band section one by one, obtains each son frequency
Vision carrier frequency point in the spectrogram in section section；
Channel setup module, for carrying out tuning according to each described image carrier frequency point, by the frequency point setting after tuning confirms
For channel carrier frequency point；
The spectrum analysis module includes:
First analytical unit carries out spectrum analysis for the radiofrequency signal one by one to the frequency sub-band section, when the frequency sub-band
Frequency point in section has signal spectrum, using the Frequency point as potential frequency point；
Second analytical unit will if also having signal spectrum for being spaced the Frequency point that the potential frequency point presets frequency range interval
The potential frequency point is set as vision carrier frequency point, the vision carrier frequency point in spectrogram to obtain each frequency sub-band section.
6. television terminal channel searching system as claimed in claim 5, which is characterized in that the channel setup module includes:
Fine-adjusting unit, for presetting all frequencies in fine tuning bandwidth range to each described image carrier frequency point with default fine tuning step-length
Point is demodulated；
Setting unit, for each described image carrier frequency point to be preset the maximum frequency point setting of signal strength in fine tuning bandwidth range
For channel carrier frequency point.
7. television terminal channel searching system as claimed in claim 5, which is characterized in that the section obtains module and includes:
First acquisition unit, for obtaining the corresponding country in current location locating for television terminal when detecting tuning instruction
Information；
Second acquisition unit, for corresponding frequency range section being obtained, using the frequency range section as TV according to the national information
The frequency range section of the currently received radiofrequency signal of terminal.
8. the television terminal channel searching system as described in claim 5 to 7 any one, which is characterized in that the interval division mould
Block includes:
Filter unit, for being filtered by bandpass filter to the received radiofrequency signal of television terminal；
Zoning unit, for exporting the radiofrequency signal of pre-set bandwidths one by one, using by the frequency range interval division as pre-set bandwidths and
Continuously distributed frequency sub-band section.
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| CN201510952919.5A CN105516798B (en) | 2015-12-17 | 2015-12-17 | Television terminal channel search method and system |
| PCT/CN2016/084490 WO2017101264A1 (en) | 2015-12-17 | 2016-06-02 | Channel searching method and system for television terminal |
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| CN201510952919.5A CN105516798B (en) | 2015-12-17 | 2015-12-17 | Television terminal channel search method and system |
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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 |
| CN106658165A (en) * | 2016-12-09 | 2017-05-10 | 广州视源电子科技股份有限公司 | Television channel search method and device |
| CN108880720B (en) * | 2017-04-01 | 2020-04-14 | 建荣半导体（深圳）有限公司 | Automatic channel searching method and device for radio equipment and radio equipment |
| CN108989719B (en) * | 2018-06-29 | 2021-06-25 | 广州视源电子科技股份有限公司 | Channel searching method and system, readable storage medium and smart television |
| CN111211861B (en) * | 2020-01-19 | 2023-03-28 | 成都立鑫新技术科技有限公司 | Signal interference method of mobile terminal |
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| DE10331294B3 (en) * | 2003-07-10 | 2005-02-17 | Infineon Technologies Ag | Method and arrangement for fast frequency search in broadband mobile radio receivers |
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| WO2010082911A1 (en) * | 2009-01-15 | 2010-07-22 | Thomson Licensing | Method and apparatus for managing a frequency spectrum |
| US9380251B2 (en) * | 2009-06-04 | 2016-06-28 | Mediatek Inc. | Method for performing channel scan within a multi-channel broadcasting program receiver, and associated multi-channel broadcasting program receiver |
| CN102164259A (en) * | 2011-02-01 | 2011-08-24 | 华为终端有限公司 | Television program searching method, receiving method as well as related equipment and system |
| 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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| CN1615005A (en) * | 2003-11-04 | 2005-05-11 | 台达电子工业股份有限公司 | Tv-set channel searching method |
| CN1615004A (en) * | 2004-09-03 | 2005-05-11 | 杭州国芯科技有限公司 | Automatic channel searching method in digital Tv-set |
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