CN104519287B - TV signal receiver and judge channel whether the method for including TV programme signal - Google Patents
TV signal receiver and judge channel whether the method for including TV programme signal Download PDFInfo
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- CN104519287B CN104519287B CN201310446147.9A CN201310446147A CN104519287B CN 104519287 B CN104519287 B CN 104519287B CN 201310446147 A CN201310446147 A CN 201310446147A CN 104519287 B CN104519287 B CN 104519287B
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Abstract
The present invention propose a kind of electrical video signal reception device and judge target channel whether the method for including TV programme signal.Electrical video signal reception device includes：One tuner, the target channel is chosen for receiving a radiofrequency signal, and in the multiple channels included from the radiofrequency signal and carries out frequency reducing for the target channel；One analog-digital converter, the analog signal for the target channel is carried are converted to a data signal；One computing circuit, for carrying out related operation to the data signal to obtain an operation result；And a control circuit, judge whether the target channel includes the TV programme signal according to the operation result.
Description
Technical field
The present invention be on TV signal receiver and judge channel whether the method for including TV programme signal, especially
It is quickly to judge whether channel includes device and the side of TV programme signal on ISDBT television systems or DVB-T television systems
Method.
Background technology
Whether one of the function at television reception end is to scan television channel, that is, judge some television channel comprising electricity
Depending on programme signal.Referring to Fig. 1, it is known terrestrial integrated formula service digits broadcast（Integrated Services
Digital Broadcasting-Terrestrial, hereinafter referred to as ISDBT）Signal receiving end functional block diagram.In number
In word television broadcasting, radiofrequency signal includes multiple television channels, and a television channel includes more than one TV programme
Signal.Tuner 110 chooses a target channel from after antenna 105 receives radiofrequency signal, from multiple television channels, and by mesh
The radiofrequency signal frequency reducing for marking channel is middle low frequency signal.Target channel will be examined whether include TV Festival in follow-up circuit
Mesh signal.Analog-digital converter 115 couples tuner 110, and the analog signal for target channel is carried is converted to number
Word signal.Fast Fourier transform（Fast Fourier Transform,FFT）Circuit 125 is used for data signal from time domain
Conversion is to frequency domain, and the above and below of fast Fourier transform circuit 125 respectively couples a synchronous circuit, because two is synchronous
Circuit is respectively in the synchronization program of time domain and frequency domain processing data signal, so being named as time-domain synchronous circuit 120 and frequency respectively
Domain synchronous circuit 130, time-domain synchronous circuit 120 couple analog-digital converter 115.Because time-domain synchronous circuit 120 and frequency domain
Synchronous circuit 130 divides before and after, therefore both can be also referred to as to quick Fourier positioned at fast Fourier transform circuit 125
Leaf conversion is preposition（pre-FFT）Synchronous circuit and fast Fourier transform are rearmounted（post-FFT）Synchronous circuit.
Time-domain synchronous circuit 120 parses the synchronizing information needed for signal in time domain, and frequency-domain synchronous circuit 130 is in frequency domain
Parse the synchronizing information needed for signal.In implementation, visual time-domain synchronous circuit 120 is the synchronization program of processing data signal
Coarse steps, and frequency-domain synchronous circuit 130 is the fine tuning step of the synchronization program of processing data signal.Frequency-domain synchronous circuit 130
The synchronization program for handling data signal is included to data signal progress related operation（correlation operation）And obtain
Multiple correlations（correlation value）, the carrier frequency that data signal can be further obtained according to the correlation is inclined
Move（carrier frequency offset）.In more detail, carrier frequency shift can also include the carrier wave of integer part
Frequency shift (FS)（Integer Carrier Frequency Offset,ICFO）, and the carrier frequency shift of fractional part
（Fractional Carrier Frequency Offset,FCFO）, and correlation can also be subdivided into ICFO correlations and FCFO
Correlation.As shown in figure 1, frequency-domain synchronous circuit 130 directly couples time-domain synchronous circuit 120, purpose is that ICFO information
Time-domain synchronous circuit 120 is sent to, time-domain synchronous circuit 120 just can carry out compensated digital signal according to ICFO correlations, make compensation
There is no frequency shift (FS) for data signal afterwards.
Please continue to refer to Fig. 1.Channel estimation circuit 135 couples frequency-domain synchronous circuit 130, is mainly used to estimate data signal
Multi-path jamming.Balanced device 140 couples channel estimation circuit 135, is mainly used to the estimation knot according to channel estimation circuit 135
Fruit, the target signal filter of other channels outside major channel.TMCC（Transmission and Multiplexing
Configuration Control, transmission control with multiplexing configuration）Decoding circuit 145 couples balanced device 140, for parsing
The modulation scheme and ISN code check of data signal（code rate of inner code）Etc. information.TMCC decoding circuits 145
Sequentially couple Frequency Domain Solution interleave circuit 150 afterwards and time domain deinterleaves circuit 155, be respectively intended in frequency domain and time domain to numeral
Signal is deinterleaved processing.Solve quadrature amplitude modulation mapping（QAM demapping）Circuit 160 couples time solution interleave circuit 155,
For becoming to the digital demodulation signal.Be coupled to the circuit after solution quadrature amplitude modulation mapping circuit 160 include continuously couple it is interior
Portion deinterleaves circuit 165, Viterbi decoder（Viterbi decoder）170 and outer deinterleave circuit 175.Interior Solutions are handed over
Knitting circuit 165, deinterleaving internal to data signal progress and outside is handled respectively with outer deinterleave circuit 175；And Viterbi
Decoder is then used for carrying out Veterbi decoding to data signal.Last reed-solomon（Reed-Solomon）Decoding circuit
180 coupling outer deinterleave circuits 175, for carrying out RS-decode to data signal, and are produced needed for television system
Transmission stream signal.
In known technology, typically to wait until that RS-decode circuit 180 can just learn mesh after completing decoding program
Whether programme signal is included in mark channel.Though there is document to propose on numeral to believe using what TMCC decoding circuits 145 were parsed
Number some characteristics, the information such as example modulation scheme as the aforementioned and ISN code check, to judge whether target channel includes in advance
TV programme signal, but judge that the average time needed for a channel is about 300~550ms, when channel quantity is big, sweep
The total time retouched needed for all channels is still considerable.
The content of the invention
In view of the deficiencies in the prior art, a purpose of the invention is to provide a kind of electrical video signal reception device with judging
Channel whether the method for including TV programme signal, to save the time needed for channel scanning.
The present invention proposes a kind of electrical video signal reception device, for judging whether a target channel includes a TV programme
Signal, comprising：One tuner, for receiving a radiofrequency signal, and choose and be somebody's turn to do in the multiple channels included from the radiofrequency signal
Target channel simultaneously carries out frequency reducing for the target channel；One analog-digital converter, for the target channel is carried one
Analog signal is converted to a data signal；One computing circuit, for carrying out related operation to the data signal to obtain a computing
As a result；And a control circuit, judge whether the target channel includes the TV programme signal according to the operation result.
The present invention separately propose it is a kind of judge a target channel whether the method for including a TV programme signal, comprising：Receive
One radiofrequency signal, and the target channel is chosen in the multiple channels included from the radiofrequency signal and is carried out for the target channel
Frequency reducing；The analog signal that the target channel is carried is converted to a data signal；Related operation is carried out to the data signal
To obtain an operation result；And judge whether the target channel includes the TV programme signal according to the operation result.
The electrical video signal reception device of the present invention is with judging whether target channel includes the method energy of TV programme signal
It is enough quickly to judge whether target channel transmits TV programme signal.Compared to known technology, the present invention can be ahead of time at several signals
Reason program just can judge whether target channel includes TV programme signal, therefore can save the time needed for channel scanning.
Brief description of the drawings
For the above objects, features and advantages of the present invention can be become apparent, the tool below in conjunction with accompanying drawing to the present invention
Body embodiment elaborates, wherein：
Fig. 1 is the functional block diagram of the signal receiving end of known terrestrial integrated formula service digits broadcast；
Fig. 2 is ICFO correlations and the graph of a relation of whole ICFO indexs of correlation in the presence of TV programme signal；
Fig. 3 is the functional block diagram of the signal receiving end of terrestrial integrated formula service digits of the present invention broadcast；
Fig. 4 is ICFO correlations and the graph of a relation of ICFO indexs of correlation when TV programme signal is not present；
Fig. 5 judges whether target channel includes the flow of an embodiment of the method for TV programme signal for the present invention's
Figure；And
Fig. 6 judges whether target channel includes the flow of another embodiment of the method for TV programme signal for the present invention's
Figure.
Component label instructions in figure：
101 control circuits
102 computing circuits
105 antennas
110 tuners
115 analog-digital converters
117 reversing spectrum devices
120 time-domain synchronous circuits
125 fast Fourier transform circuits
130 frequency-domain synchronous circuits
135 channel estimation circuits
140 balanced devices
145 TMCC decoding circuits
150 Frequency Domain Solution interleave circuits
155 time solution interleave circuits
160 solution quadrature amplitude modulation mapping circuits
165 Interior Solutions interleave circuits
170 Viterbi decoders
175 outer deinterleave circuits
180 RS-decode circuits
S510~S580, S610~S660 steps
Embodiment
The technical terms of following description is the idiom with reference to the art, if this specification is to part term
It is illustrated or defines, the explanation of the part term is defined by the explanation of this specification or definition.
The disclosure content of the present invention includes electrical video signal reception device and judges whether target channel includes TV programme
The method of signal, it can accelerate to scan the speed of television channel.The apparatus and method at least can be applied to ISDBT television systems or
DVB-T television system.Be embodied as it is possible under the premise of, those of ordinary skill in the art being capable of draping over one's shoulders according to this specification
Dew content selects equivalent element or step to realize the present invention, that is, the implementation of the present invention be not limited to after the implementation chatted
Example.By the subelement that is included of electrical video signal reception device of the present invention it is independent for may be well known elements, therefore
On the premise of the abundant disclosure of device invention and exploitativeness is not influenceed, illustrate to give for the details of well known elements below
With memorandum.In addition, the present invention judge target channel whether the method comprising TV programme signal can be by TV of the invention
Frequency signal receiving device or its equivalent device perform, in the abundant disclosure for not influenceing this method invention and the premise of exploitativeness
Under, the explanation of following methods invention will focus on step content and non-hardware.
Referring to Fig. 2, it is the correlation of the carrier frequency shift of integer part and the carrier frequency shift of integer part
Index of correlation graph of a relation.When target channel includes TV programme signal, a maximum, example occurs in ICFO correlations
As ICFO indexs of correlation are R [0] ICFO correlations in Fig. 2, and ICFO corresponding to its neighbouring ICFO index of correlation is related
It is close to be worth size, and has great gap in comparison with R [0] ICFO correlations.ICFO indexs of correlation R [0] can be indicated
The position of frequency deviation, such as correspond to 6000Hz, then time-domain synchronous circuit 120 just carrys out the frequency deviation of compensated digital signal according to this numerical value.
Referring to Fig. 3, it is the functional block diagram of the signal receiving end of terrestrial integrated formula service digits broadcast of the present invention.By
In one of major function of time-domain synchronous circuit 120, fast Fourier transform circuit 125 and frequency-domain synchronous circuit 130 be
Time domain and frequency domain carry out related operation to data signal, and the result of related operation includes the ICFO correlations and FCFO of data signal
Correlation, and again depending at least on the carrier frequency shift of ICFO correlation compensated digital signals.Therefore will can perform above-mentioned
Three circuits of function are collectively referred to as computing circuit 102, and every carrier frequency shift that can estimate data signal simultaneously compensates
Circuit all belong to the equivalent circuit of computing circuit 102.Other Fig. 3 functional block diagram also includes control circuit 101, coupling tuning
Device 110 and computing circuit 102.When the ICFO correlations pair that time-domain synchronous circuit 120 is estimated according to frequency-domain synchronous circuit 130
After the data signal carries out the compensation of carrier frequency shift, if frequency-domain synchronous circuit 130 re-evaluates load according to same method again
Frequency offset, its result will be approximate with Fig. 2 figure, and difference is frequency deviation position of the ICFO indexs of correlation indicated by R [0]
0Hz position should be ideally corresponded to, representing the data signal after compensation does not have frequency deviation.It is to work as target shown in Fig. 2
Channel includes the situation of TV programme signal, if target channel does not include TV programme signal, ICFO correlations are corresponding
ICFO indexs of correlation will be as shown in Figure 4.Referring to Fig. 4, particularly pertinent ICFO correlations will be can't see on figure.Because
When target channel does not include TV programme signal, then what is transmitted in channel is a unknown noise signal, to unknown
Noise signal does the result that carrier frequency shift estimation actually gets and does not have special physical significance.So even if frequency domain synchronization
Circuit 130 can select an ICFO index of correlation for representing carrier frequency shift at that time, but because noise signal always with
Time change, therefore the object that time-domain synchronous circuit 120 is compensated can be different noise signals.That is, frequency domain synchronization
Circuit 130 tries again the estimations of ICFO correlations to compensated noise signal, and resulting result would not instruct that signal
Carrier frequency shift corresponds to 0Hz.Therefore whether the present invention can judge target channel according to secondary ICFO correlations
Include TV programme signal.The mode of judgement can judge whether target channel is believed comprising TV programme by control circuit 101
Number.Frequency-domain synchronous circuit 130 sends secondary ICFO correlations to control circuit 101, and control circuit 101 is again according to second
Secondary ICFO correlations judge whether target channel includes TV programme signal.Another determination methods can utilize frequency domain same
Step circuit 130 is voluntarily judged according to the offset of carrier frequency shift.If target channel includes TV programme signal,
Frequency-domain synchronous circuit 130 can notify control circuit 101 by setting flag calibration method.Such as frequency-domain synchronous circuit 130 changes
Become the temporary value of register, as long as and control circuit 101 persistently monitor the temporary value can be to learn that target channel includes TV
Programme signal.That is, judging whether target channel wraps according to secondary ICFO correlations in control circuit 101
Circuit containing TV programme signal, it can be integrated into frequency-domain synchronous circuit 130.That is, one kind is that control circuit 101 is direct
Judge according to secondary ICFO correlations, and another kind is control circuit 101 indirectly according to secondary ICFO correlations
To judge.
In summary, the present invention can control computing circuit 102 using control circuit 101, it is performed ICFO twice
The estimation of correlation, and learn whether target channel includes TV programme signal according to ICFO correlations.In more detail, if
The carrier frequency shift of secondary ICFO correlations designation number signal is 0（That is, corresponding to the maximum of ICFO correlations
ICFO indexs of correlation correspond to 0Hz）, just represent target channel and include TV programme signal；Relative, if secondary
ICFO correlations represent that the carrier frequency shift of data signal is not 0, represent the signal that is included of target channel be noise rather than
TV programme signal, now control circuit 101 can control tuner 110 choose other channels, consequently, it is possible to frequency-domain synchronous circuit
Circuit after 130 all will not carry out computing to the signal of target channel again, save substantial amounts of operation time.
Except above-mentioned judgment mode, the present invention also discloses another judgment mode, and it is equally according to ICFO correlations
Judged.Fig. 2 and Fig. 4 is referred to, when target channel includes TV programme signal（As shown in Figure 2）, ICFO correlations with
There is a great ICFO correlation in the graph of a relation of ICFO indexs of correlation（I.e. numerical value correlation adjacent thereto is above permitted compared to big
It is more）；But when target channel does not include programme signal（As shown in Figure 4）, just can not find a more prominent ICFO phase
Pass is worth.Second of judgment mode is exactly characteristic as utilization.One is first found out from the operation result of ICFO correlations greatly
ICFO correlations, then this ICFO correlation ICFO correlations adjacent thereto are compared.The mode compared can be utilized and calculated
Several arithmetics, such as by great ICFO correlations divided by its neighbouring ICFO correlation, if obtained ratio is more than
One default critical value, then represent target channel and include TV programme signal；Or the absolute value of both differences if greater than
One default critical value, also represent that target channel includes TV programme signal.
It is similar to the first judgment mode, in second of judgment mode control circuit 101 equally can by directly or
Indirect mode to be judged according to ICFO correlations.If direct mode, then frequency-domain synchronous circuit 130 is first by ICFO phases
Pass value sends control circuit 101 to, and the action described in the preceding paragraph is performed by control circuit 101；If indirect mode, then upper one
Duan Suoshu action is performed by frequency-domain synchronous circuit 130, notifies control circuit after being finished in a manner of setting flag again
101。
In some cases, the programme signal of target channel can be transmitted with anti-phase frequency spectrum, here it is so-called it is anti-phase be phase
For the default frequency spectrum processing mode of tuner 110.The TV Festival of each channel transmission positive frequency spectrum or anti-phase frequency spectrum
Mesh signal is by program provider（Such as TV station）Decide in its sole discretion, tuner 110 can not be learnt in advance.If target channel
Programme signal is anti-phase frequency spectrum, then the ICFO correlations that computing circuit 102 is estimated just are not in great correlation, because
This two kinds of above-mentioned judgment mode can all fail.In order to avoid erroneous judgement, judge target channel comprising electricity when above the step of
During depending on programme signal, control circuit 101 controls reversing spectrum device 117 to carry out reversing spectrum to data signal（spectrum
inversion）Operation, computing circuit 102 carry out related operation to the data signal after reversing spectrum again and estimate ICFO phases
Pass is worth.Reversing spectrum device 117 is coupled between digital analog converter 115 and computing circuit 102.Controlled after obtaining ICFO correlations
Circuit 101 or frequency-domain synchronous circuit 130 processed re-start any of above-mentioned judgment mode again, whether to determine target channel
Include TV programme signal.It is in the time domain by multiple kenels on reversing spectrum operating concept performed by reversing spectrum device 117
Data signal real part（I parts）With imaginary part（Q parts）Exchange（swap）（Such as be originally a+bj, become b+ after exchanging
aj）, or the data signal of multiple kenels taken into its conjugate complex number（Complex Conjugate）, exchanged by real imaginary part（IQ
swap）Or conjugation after data signal again via fast Fourier transform after, resulting frequency spectrum is the anti-of script frequency spectrum
Turn, that is, maximum data sound（data tone）Exchanged with the data sound of minimum, second largest data sound and the second small money
Expect that sound exchanges, the rest may be inferred by analogy for it.
The present invention is equally applicable for DVB-T television system.During television system applied to DVB-T, the TV shown in Fig. 3
Circuit block diagram of the frequency signal receiving device after balanced device 140 will have a little difference, but tuner 110, simulation numeral
Converter 115 and computing circuit 102 are still necessary circuit in DVB-T television system, and reversing spectrum device 117 is in DVB-T
Television system in can also reach identical effect.
Referring to Fig. 5, its be the present invention judge target channel whether include TV programme signal method an implementation
The flow chart of example.In addition to foregoing electrical video signal reception device, the present invention also accordingly discloses one kind and judges target frequency
Road whether the method for including TV programme signal, applied to ISDBT television systems or DVB-T television system, can quickly judge
Whether target channel includes TV programme signal.This method is held by foregoing electrical video signal reception device or its equivalent device
OK.As shown in figure 5, one embodiment of the invention comprises the steps of：
Step S510：Target channel is chosen in the multiple channels included from radiofrequency signal, and is entered for the target channel
Row frequency reducing.In television broadcasting, radiofrequency signal generally comprises multiple channels, in order to check whether each channel includes TV programme
Signal, this step first select a target channel as the object checked；
Step S520：The analog signal that target channel is carried is converted to data signal.TV programme signal is with mould
The mode of plan is propagated, but checks that TV programme signal will be handled when whether there is in a manner of digital, so first by target channel
The analog signal carried is converted to data signal；
Step S530：First time related operation is carried out to data signal to obtain the ICFO correlations of first time.First logarithm
Word signal carries out first related operation, to obtain the ICFO correlations of data signal.If programme signal is present, ICFO is related
The relation of value and ICFO indexs of correlation will be as shown in Figure 2；If it does not, the relation of ICFO correlations and ICFO indexs of correlation will
As shown in Figure 4；
Step S540：Carrier frequency shift according to the ICFO correlation compensated digital signals of first time.If TV Festival
Mesh signal is present, as shown in Fig. 2 a great ICFO correlation can be found, and the ICFO corresponding to the ICFO correlations
Index of correlation can correspond to the deviation post of carrier frequency.Such as the corresponding 6000Hz of ICFO indexs of correlation R [0], then the skew compensated
Amount is exactly 6000Hz；
Step S550：It is related to obtain secondary ICFO that second of related operation is carried out to the data signal after compensation
Value.By previous step compensating carrier frequency offset, data signal should be unable to have frequency deviation again in theory.Therefore this step institute
The secondary ICFO correlations tried to achieve should designation number signal there is no frequency deviation, that is, Fig. 2 ICFO indexs of correlation R [0]
0Hz should be corresponded to.But if what target channel included is noise signal rather than TV programme signal, as shown in figure 4, i.e.
Previous step is found a relatively large ICFO correlation reluctantly, but corresponding to it be not correct frequency deviation, and
The object of compensation is also with time continually changing noise signal always, so secondary ICFO correlations obtained by this step
There is very big chance to show that data signal still has frequency deviation.Therefore according to secondary ICFO correlations, that is, compensation is checked
Whether data signal afterwards still has frequency deviation, you can learns whether target channel includes programme signal；
Step S560：Judge whether target channel includes TV programme signal.In more detail, this step is according to second
Secondary ICFO correlations judge whether target channel includes TV programme signal.If as described above, second of ICFO correlation
Indicated frequency shift (FS) position display frequency shift (FS) is 0Hz, represents that target channel includes TV programme signal；But if
Frequency shift (FS) position display frequency shift (FS) indicated by secondary ICFO correlations is not 0Hz, then it represents that what target channel included is
Noise signal rather than TV programme signal.If target channel includes TV programme signal, whole flow process can be terminated, otherwise
Perform step S570；
Step S570：Judge whether that reversing spectrum computing is crossed in executed.The TV programme of target channel in some cases
Reversing spectrum can be presented in signal, in this case, even if target channel includes TV programme signal, terminate in the step of above
Afterwards, target channel will be judged as not including TV programme signal, so must first determine that executed is excessively digital in flow
The reversing spectrum of signal can just determine target channel either with or without comprising TV programme signal.If data signal is not through overfrequency
Spectral inversion, then step S580 must be carried out, if performing reversing spectrum, then can terminate whole flow process；And
Step S580：Reversing spectrum computing is carried out to data signal.Data signal after reversing spectrum will present correct
Data, therefore can determine whether target channel includes TV programme signal after performing a step S530~S560 again.
Referring to Fig. 6, its be the present invention judge target channel whether include TV programme signal method another reality
Apply the flow chart of example.As shown in fig. 6, step S610~S630 is identical with the step S510~S530 of upper one embodiment, to keep away
Exempt from superfluous text, therefore no longer repeat.Remaining step of the present embodiment is as follows：
Step S640：Judge whether target channel includes TV programme signal.In more detail, this step is according to ICFO
The adjacent correlation of very big correlation of correlation judges whether target channel includes TV programme signal.It is same as above, Fig. 2
And Fig. 4 represents the ICFO correlations and ICFO phases when target channel includes TV programme signal and do not include electrical video signal respectively
Close the graph of a relation of index.Therefore it can judge whether target channel is believed comprising program using great ICFO correlations in Fig. 2
Number, the mode of judgement in the upper device invention taken off it is stated that, therefore repeat no more.If target channel is believed comprising TV programme
Number, then it can terminate whole flow process, otherwise perform step S660.
And step S650 and S660 is identical with the step S570 and S580 in last embodiment, therefore repeat no more.
According to the present invention device or method, judge one channel whether include programme signal needed for average time about
For 150~200ms, compared to 300~550ms needed for known method, significantly save and judge the time.It is in addition, anti-in frequency spectrum
In the case of turning, it is known that method needs about 600~1000ms to complete to judge, but the present invention only needs about 200~250ms
With regard to result can be obtained.Therefore compared to known method, the present invention can more rapidly judge whether a channel includes TV programme
Signal.
Due to the art tool usually intellectual can by Fig. 3 device invent disclosure content come understand Fig. 5 and
The implementation detail of Fig. 6 method invention and change, therefore, to avoid superfluous text, do not influence the exposure requirement of this method invention and
On the premise of exploitativeness, the explanation repeated gives memorandum herein.It note that in foregoing diagram, the shape of element, size, ratio
Order of example and step etc. is only to illustrate, and is to understand the present invention for those of ordinary skill in the art to be used, is not used to limit
The system present invention.In addition, the art personage can disclosure content under this invention and the demand of itself optionally implement it is any
The part or all of technical characteristic of embodiment, or optionally implement the group of the part or all of technical characteristic of multiple embodiments
Close, the elasticity when increase present invention is implemented whereby.Furthermore though previous embodiment, by taking ISDBT television systems as an example, so this is not pair
The limitation of the present invention, the art personage, which under this invention can disclose, suitably applies the present invention to other types of TV
System, such as DVB-T television systems.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification and perfect, therefore the protection model of the present invention can be made
Enclose to work as and be defined by what claims were defined.
Claims (17)
1. a kind of electrical video signal reception device, for judging whether a target channel includes a TV programme signal, comprising：
One tuner, target frequency is chosen for receiving a radiofrequency signal, and in the multiple channels included from the radiofrequency signal
Road simultaneously carries out frequency reducing for the target channel；
One analog-digital converter, the analog signal for the target channel is carried are converted to a data signal；
One computing circuit, for carrying out related operation to the data signal to obtain an operation result；And
One control circuit, judge whether the target channel includes the TV programme signal according to the operation result；
The computing circuit is that a pre-computation result of foundation first time related operation compensates the carrier frequency shift of the data signal,
And second of related operation is carried out to the data signal after compensation to obtain the operation result.
2. electrical video signal reception device as claimed in claim 1, it is characterised in that the operation result includes multiple correlations
Value, the control circuit is to determine whether the target channel includes the TV Festival according to the very big correlation in the plurality of correlation
Mesh signal.
3. electrical video signal reception device as claimed in claim 2, it is characterised in that the control circuit is according to the very big phase
Whether pass is worth determines the target channel comprising TV programme letter with one adjacent to one of the ratio of correlation and difference
Number.
4. electrical video signal reception device as claimed in claim 1, it is characterised in that the control circuit is according to the computing knot
A frequency shift (FS) position indicated by fruit judges whether the target channel includes the TV programme signal.
5. electrical video signal reception device as claimed in claim 1, it is characterised in that the computing circuit includes：
One time-domain synchronous circuit, for compensating the carrier frequency shift of the data signal in the time domain according to the operation result；
One fast Fourier transform circuit, frequency domain is gone to from time domain for the data signal after compensating in the time domain；
And
One frequency-domain synchronous circuit, for carrying out related operation to the data signal for going to frequency domain to obtain the computing in a frequency domain
As a result.
6. electrical video signal reception device as claimed in claim 5, it is characterised in that it is same that the control circuit is contained in the frequency domain
In step circuit.
7. electrical video signal reception device as claimed in claim 1, in addition to a reversing spectrum device, are coupled to the simulation numeral
Between converter and the computing circuit, if wherein the control circuit judges that the target channel does not include the TV programme signal,
The control circuit controls the reversing spectrum device to carry out inverting op to the frequency spectrum of the data signal.
8. electrical video signal reception device as claimed in claim 1, it is characterised in that if the control circuit judges target frequency
Road does not include the TV programme signal, then the control circuit controls the tuner to choose other channels from the plurality of channel.
9. electrical video signal reception device as claimed in claim 1 is to be applied to ISDBT television systems or DVB-T TVs system
System.
10. it is a kind of judge a target channel whether the method for including a TV programme signal, comprising：
A radiofrequency signal is received, and the target channel is chosen in the multiple channels included from the radiofrequency signal and is directed to the target
Channel carries out frequency reducing；
The analog signal that the target channel is carried is converted to a data signal；
Related operation is carried out to the data signal to obtain an operation result；And
Judge whether the target channel includes the TV programme signal according to the operation result；
Before carrying out the step of related operation is to obtain the operation result to the data signal, an advance related operation is performed to obtain
To a pre-computation result, and compensate according to the pre-computation result carrier frequency shift of the data signal.
11. determination methods as claimed in claim 10, it is characterised in that the operation result includes multiple correlations, and should be according to
Judge that the step of whether target channel includes the TV programme signal is according in the plurality of correlation according to the operation result
One very big correlation judges whether the target channel includes the TV programme signal.
12. determination methods as claimed in claim 11, it is characterised in that this is greatly related according to one in the plurality of correlation
Value judges that the step of whether target channel includes the TV programme signal is neighbouring related to one according to the very big correlation
One of the ratio of value and difference determine whether the target channel includes the TV programme signal.
13. determination methods as claimed in claim 10, it is characterised in that this judges that the target channel is according to the operation result
No the step of including the TV programme signal is to judge the target according to the frequency shift (FS) position indicated by the operation result
Whether channel includes the TV programme signal.
14. determination methods as claimed in claim 10, it is characterised in that related operation is carried out to the data signal to be somebody's turn to do
The step of operation result, also includes：
Compensate the carrier frequency shift of the data signal in the time domain according to the operation result；
The data signal after compensating in the time domain goes to frequency domain from time domain；And
Related operation is carried out to retrieve the operation result to the data signal for going to frequency domain in a frequency domain.
15. determination methods as claimed in claim 10, are also included：
If judging, the target channel does not include the TV programme signal, and inverting op is carried out to the frequency spectrum of the data signal.
16. determination methods as claimed in claim 10, are also included：
If judge that the target channel does not include the TV programme signal, other channels are chosen from the plurality of channel.
17. determination methods as claimed in claim 11 are to be applied to ISDBT television systems or DVB-T television systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446147.9A CN104519287B (en) | 2013-09-26 | 2013-09-26 | TV signal receiver and judge channel whether the method for including TV programme signal |
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| JP3733093B2 (en) * | 2002-08-22 | 2006-01-11 | 三洋電機株式会社 | Broadcast receiving apparatus and broadcast receiving method |
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