CN105898163A - Television signal frequency deviation processing method and system - Google Patents
Television signal frequency deviation processing method and system Download PDFInfo
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- CN105898163A CN105898163A CN201610442688.8A CN201610442688A CN105898163A CN 105898163 A CN105898163 A CN 105898163A CN 201610442688 A CN201610442688 A CN 201610442688A CN 105898163 A CN105898163 A CN 105898163A
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- 238000012545 processing Methods 0.000 claims abstract description 19
- 230000010355 oscillation Effects 0.000 claims description 59
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
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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
- H04N5/455—Demodulation-circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
-
- 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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
-
- 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
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Aviation & Aerospace Engineering (AREA)
- Electromagnetism (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention discloses a television signal frequency deviation processing method and system. The system comprises a high frequency tuner mixing circuit, a frequency discriminating circuit, a filtering circuit, a voltage controlled oscillating circuit and a central processing unit controlled high frequency tuner chip. Before intermediate frequency signals generated in a high frequency tuner through mixing enter a demodulator, the frequency discriminating circuit discriminates frequency, the filtering circuit filters the signal, the voltage controlled oscillating circuit produces vibration frequency, and the central processing unit controlled high frequency tuner chip divides the frequency; therefore, when frequency deviation occurs in the television signal frequency, the local frequency of the high frequency tuner deviates along with the television signal frequency; the frequency deviation magnitude of the local frequency is the same as that of the television signal frequency; finally the frequency received by a television receiving system has no deviation; the good receiving effect is realized; and the user experience is improved.
Description
Technical field
The present invention relates to TV technology, particularly relate to a kind of TV signal frequency skew processing method with
System.
Background technology
Along with the development of satellite set top box technology, increasing country and operator select to use subhost top
Box, the carrier wave of satellite frequency is typically all about 3000M, so launching equipment, transmission equipment, transmission
Channel circumstance impact etc., can there is the skew of certain frequency in carrier frequency, current satellite set top box is usually met
To problem be exactly that the frequency of frequency of operator offsets, the Consumer's Experience that cause the user is bad.Typically
Set Top Box can pin program in less frequency shift (FS), and the company producing Set Top Box at present can accomplish to allow
Frequency shift (FS) about 3M, so a lot of company does not the most process for frequency shift (FS).If but operator
Frequency shift (FS) can cause the situation searching incessantly platform more than 3M, even and if do not have frequency deviation to arrive 3M, if super
Crossing the frequency of 100K and disturbing for the anti-numerical frequency of this Set Top Box is also to reduce, and such consequence is held exactly
Easily cause mosaic.
Summary of the invention
The processing method and system, the method and the system that the invention provides the skew of a kind of TV signal frequency can
So that the frequency that TV receiving system receives does not has deviation, reach good reception.
For realizing above-mentioned design, the present invention by the following technical solutions:
On the one hand, it is provided that a kind of TV signal frequency skew processing method, including:
The local frequency of TV signal frequency and high-frequency tuner is mixed, produces intermediate-freuqncy signal；
Described intermediate-freuqncy signal is input in frequency-discriminating circuit, according to the frequency of described intermediate-freuqncy signal Yu zero intermediate frequency signals
The output of rate difference adjusts level；
Described adjustment level is filtered, obtains DC level；
Described DC level is input in Voltage-Controlled oscillation circuit, produces frequency of oscillation；
Described frequency of oscillation is divided, is adjusted frequency, using described adjustment frequency as high in mixing
The local frequency of conversion tuner.
Wherein, the described frequency-splitting output according to described intermediate-freuqncy signal with zero intermediate frequency signals adjusts level, bag
Include:
The frequency of described intermediate-freuqncy signal is compared with the frequency of zero intermediate frequency signals, obtains frequency-splitting；
Level is adjusted according to the output of described frequency-splitting.
Wherein, described according to described frequency-splitting output adjustment level, particularly as follows:
When described frequency-splitting is timing, export positive justification level；
When described frequency-splitting is for time negative, export negative justification level.
Wherein, described in obtain frequency-splitting after, also include:
When described frequency-splitting is zero, described intermediate-freuqncy signal is exported to demodulator.
Wherein, described described frequency of oscillation is divided, particularly as follows: collected by inside by central processing unit
Described frequency of oscillation is divided by the frequency divider becoming circuit communication protocol integrated test system high-frequency tuner.
Wherein, the frequency discrimination chip of described frequency-discriminating circuit is AD9901 chip；
The voltage controlled oscillator of described Voltage-Controlled oscillation circuit is MC1648 agitator.
On the other hand, it is provided that a kind of TV signal frequency TV signal frequency skew processing system, including:
High-frequency tuner mixting circuit, receives TV signal frequency TV signal frequency, is believed by described TV
Number frequency is mixed with high-frequency tuner local frequency, produces intermediate-freuqncy signal, described to frequency-discriminating circuit output
Intermediate-freuqncy signal；
Frequency-discriminating circuit, receives described intermediate-freuqncy signal, according to the frequency of described intermediate-freuqncy signal Yu zero intermediate frequency signals
Difference is adjusted level, adjusts level to filter circuit output；
Filter circuit, receives described adjustment level, is filtered adjusting level, obtains DC level,
DC level is exported to Voltage-Controlled oscillation circuit；
Voltage-Controlled oscillation circuit, receives described DC level, produces frequency of oscillation, Xiang Gao according to DC level
Conversion tuner chip exports described frequency of oscillation；
Central processing unit controls high-frequency tuner chip and divides described frequency of oscillation, is adjusted frequency,
Using described adjustment frequency as the high-frequency tuner local frequency being mixed.
Wherein, described frequency-discriminating circuit particularly as follows:
Receive described intermediate-freuqncy signal, the frequency of described intermediate-freuqncy signal is compared with the frequency of zero intermediate frequency signals
Relatively, obtain frequency-splitting, be adjusted level according to described frequency-splitting, export described tune to filter circuit
Whole level.
Wherein, described it is adjusted level according to described frequency-splitting, particularly as follows:
When described frequency-splitting is timing, obtain positive justification voltage；
When described frequency-splitting is for, time negative, obtaining negative justification voltage.
Wherein, also include:
Output unit, when described frequency-splitting is zero, exports described intermediate-freuqncy signal to demodulator；
The frequency discrimination chip of described frequency-discriminating circuit is AD9901 chip；
The voltage controlled oscillator of described Voltage-Controlled oscillation circuit is MC1648 agitator.
The invention have the benefit that the embodiment of the present invention is by by TV signal frequency and high-frequency tuner
Local frequency is mixed, and produces intermediate-freuqncy signal；Described intermediate-freuqncy signal is input in frequency-discriminating circuit, according to
Described intermediate-freuqncy signal adjusts level with the frequency-splitting output of zero intermediate frequency signals；Described adjustment level is filtered
Ripple, obtains DC level；Described DC level is input in Voltage-Controlled oscillation circuit, produces frequency of oscillation；
Described frequency of oscillation is divided, is adjusted frequency, described adjustment frequency is adjusted as mixing medium-high frequency
The local frequency of humorous device.Passed sequentially through before the intermediate-freuqncy signal entrance demodulator that high-frequency tuner mixing produces
Frequency-discriminating circuit frequency discrimination, filtering, agitator frequency dividing, thus realize when the TV signal frequency frequency of occurrences offsets,
TV signal frequency is followed to offset together the local frequency of high-frequency tuner, and the frequency of this local frequency
Bias size is identical with the frequency shift (FS) size of TV signal frequency, finally makes TV receiving system receive
Frequency there is no deviation, thus reach good reception, improve the experience of user.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, the embodiment of the present invention will be retouched below
In stating, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments of the present invention, for those of ordinary skill in the art, are not paying creative work
Under premise, it is also possible to content according to embodiments of the present invention and these accompanying drawings obtain other accompanying drawing.
Fig. 1 is the processing method of a kind of TV signal frequency skew provided in the specific embodiment of the invention
The method flow diagram of first embodiment.
Fig. 2 is the processing method of a kind of TV signal frequency skew provided in the specific embodiment of the invention
The method flow diagram of the second embodiment.
Fig. 3 is the kam-frequency characteristic schematic diagram of frequency-discriminating circuit.
Fig. 4 is that TV signal frequency offsets and do not has the mixing schematic diagram of skew.
Fig. 5 is the processing system of a kind of TV signal frequency skew provided in the specific embodiment of the invention
Circuit structure block diagram.
Fig. 6 is the operating diagram of AD9901 frequency-discriminating circuit.
Fig. 7 is the circuit theory diagrams of Voltage-Controlled oscillation circuit.
Detailed description of the invention
Technical scheme and the technique effect reached for making to present invention solves the technical problem that, using are clearer,
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the present invention is described in further detail, it is clear that retouched
The embodiment stated is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, the every other reality that those skilled in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
Refer to Fig. 1, it is the place of a kind of TV signal frequency skew provided in the specific embodiment of the invention
The method flow diagram of the first embodiment of reason method.As it can be seen, the method includes:
Step S101: the local frequency of TV signal frequency and high-frequency tuner be mixed, produces intermediate frequency
Signal.
TV signal frequency is input in high-frequency tuner (Tuner, tuner) mixting circuit, with Tuner
The Tuner local frequency of mixting circuit is mixed, and produces intermediate-freuqncy signal.
Step S102: described intermediate-freuqncy signal be input in frequency-discriminating circuit, according in described intermediate-freuqncy signal and zero
Frequently the frequency-splitting output of signal adjusts level.
The intermediate-freuqncy signal that mixing produces being input in frequency-discriminating circuit, frequency-discriminating circuit is by intermediate-freuqncy signal and zero intermediate frequency
Signal carries out contrast and obtains frequency-splitting, produces according to frequency-splitting and adjusts level, and output adjusts level.
Step S103: described adjustment level is filtered, obtains DC level.
Use filter circuit/wave filter to be filtered to adjusting level, filter ripple, obtain DC level.By
In in frequency-discriminating circuit, the time that intermediate-freuqncy signal and zero intermediate frequency signals compare is than very fast, thus the adjustment of output
Comparatively fast, level change can cause the generation of ripple to level change also ratio, and level change is the fastest, the ripple of generation
The biggest, so the adjustment level from frequency-discriminating circuit output is the adjustment level that ripple is bigger, need adjusting electricity
Put down and be filtered.A low-pass filter circuit can be used to be filtered, the filter typically built with resistance capacitance
Wave circuit.
Step S104: described DC level be input in Voltage-Controlled oscillation circuit, produces frequency of oscillation.
In Voltage-Controlled oscillation circuit, input controls voltage corresponding relation, different VCOs with output frequency
The relation that device is corresponding is the most different, and the duty of agitator is controlled voltage by input and controlled.By DC level
It is input in Voltage-Controlled oscillation circuit, controls the right of voltage and output frequency according to input in this Voltage-Controlled oscillation circuit
The relation answered produces frequency of oscillation.
Step S105: divide described frequency of oscillation, be adjusted frequency, makees described adjustment frequency
For being mixed the local frequency of medium-high frequency tuner.
Central processing unit (Central Processing Unit, CPU) passes through internal integrated circuit communication protocols
Frequency of oscillation is divided by view (Inter-Integrated Circuit, IIC), is adjusted frequency,
Using this adjustment frequency as the Tuner local frequency being mixed, the most again with TV in Tuner mixting circuit
Signal frequency is mixed, and obtains intermediate-freuqncy signal, carries out next circulation it is known that obtain zero intermediate frequency signals and be
Only.As TV signal frequency be 3844MHz, Tuner local frequency be 3840MHz time, 3842MHz can be obtained
Adjustment frequency, the adjustment frequency of 3844MHz, then would not become again, the most at last the adjustment of 3844MHz
Frequency, as the Tuner local frequency of mixing, obtains zero intermediate frequency signals.
In sum, the embodiment of the present invention is by entering the local frequency of TV signal frequency and high-frequency tuner
Row mixing, produces intermediate-freuqncy signal；Described intermediate-freuqncy signal is input in frequency-discriminating circuit, believes according to described intermediate frequency
Number export with the frequency-splitting of zero intermediate frequency signals and to adjust level；Described adjustment level is filtered, obtains straight
Stream level；Described DC level is input in Voltage-Controlled oscillation circuit, produces frequency of oscillation；To described vibration
Frequency divides, and is adjusted frequency, using described adjustment frequency as the local oscillator being mixed medium-high frequency tuner
Frequency.Frequency-discriminating circuit mirror was passed sequentially through before the intermediate-freuqncy signal entrance demodulator that high-frequency tuner mixing produces
Frequently, filtering, agitator divide, thus realize when the TV signal frequency frequency of occurrences offsets, by high frequency modulation
The local frequency of humorous device follows TV signal frequency to offset together, and the frequency shift (FS) size of this local frequency
Identical with the frequency shift (FS) size of TV signal frequency, the frequency finally making TV receiving system receive does not has
There is deviation, thus reach good reception, improve the experience of user.
Refer to Fig. 2, it is the process side of the TV signal frequency skew provided in the specific embodiment of the invention
The method flow diagram of the second embodiment of method.As it can be seen, the method includes:
Step S201: the local frequency of TV signal frequency and high-frequency tuner be mixed, produces intermediate frequency
Signal.
Step S202: described intermediate-freuqncy signal is input in frequency-discriminating circuit, by the frequency of described intermediate-freuqncy signal with
The frequency of zero intermediate frequency signals compares, and obtains frequency-splitting.
Alternatively, the frequency discrimination chip of frequency-discriminating circuit is AD9901 chip；It is illustrated in figure 6 AD9901 frequency discrimination
The schematic diagram of circuit work.From in figure, the input input reference frequency of frequency-discriminating circuit AD9901 and
Incoming frequency, after reference frequency and incoming frequency are compared by frequency-discriminating circuit AD9901, outfan exports
Adjust level.
Step S203: whether frequency-splitting is zero？
Whether determination frequency difference is zero, when frequency-splitting is 0, performs step S205；Work as frequency-splitting
When being not 0, perform step S204.
Step S204: adjust level according to the output of described frequency-splitting.
Level is adjusted according to the output of described frequency-splitting.When frequency-splitting is timing, export positive justification level；
When frequency-splitting is for time negative, export negative justification level.
Fig. 3 is the kam-frequency characteristic schematic diagram of frequency-discriminating circuit.It can be seen that as incoming level fRMore than reference
Level fvTime, the voltage Vd of output is just, and the voltage differing the biggest output is the biggest；As incoming level fR
Less than datum fvTime, the voltage Vd of output is negative, and the voltage differing the biggest output is the least；Work as input
Level fREqual to datum fvTime, the voltage of output closely 0 volt (substituting with 0V in figure).
Step S205: described intermediate-freuqncy signal is exported to demodulator.
When frequency-splitting is zero, intermediate-freuqncy signal is zero intermediate frequency signals, as shown in Figure 4, and Tuner mixting circuit
Tuner local frequency be 3840MHz, when TV signal frequency is 3840MHz, TV signal frequency with
Zero intermediate frequency signals is produced after the mixing of Tuner local frequency；Now intermediate-freuqncy signal is directly output to demodulator
(Demodulator, DEMO) is demodulated.
Step S206: described adjustment level is filtered, obtains DC level.
Step S207: described DC level be input in Voltage-Controlled oscillation circuit, produces frequency of oscillation.
Alternatively, the voltage controlled oscillator in Voltage-Controlled oscillation circuit is MC1648 agitator.Fig. 7 is VCO
The circuit theory diagrams of circuit.As it can be seen, agitator MC1648 input connects inductance L1 respectively
One end and one end of varactor C1, another input of agitator MC1648 connects inductance respectively
The other end of L1 and one end of varactor C2, the other end of varactor C1 connects transfiguration two respectively
The other end of pole pipe C2 and one end of resistance R1, the other end of resistance R1 connects filter circuit.Unidirectional current
During flat input Voltage-Controlled oscillation circuit, first pass through resistance R1.Wherein inductance L1 is 100nH, and resistance R1 is 51K
Ω.In Fig. 7, voltage controlled oscillator is that master constitutes resonant tank, resonant tank by varactor C1, C2
Mid frequency by loop equivalent L, C determine, mid frequencyVaractor etc.
Effect electric capacity, by being added in the Control of Voltage at its two ends, so just can be converted into loop resonance frequently by the change of voltage
The change of rate (frequency of oscillation), just constitutes voltage-controlled oscillator circuit.MC1648 agitator is used to arrive
Reaching the frequency of oscillation of 160MHz, the frequency of oscillation of 160MHz is easy to CPU control Tuner chip and is divided out needs
Adjustment frequency.
Step S208: divide described frequency of oscillation, be adjusted frequency, makees described adjustment frequency
For being mixed the local frequency of medium-high frequency tuner.
As shown in Figure 4, as TV signal frequency upwards 4MHz partially, when becoming 3844MHz, now do not know
TV signal frequency has offset, and Tuner local frequency remains 3840MHz, TV signal frequency and Tuner
It is no longer zero intermediate frequency signals after local frequency mixing, but the intermediate-freuqncy signal centered by 4MHz.Work as wave filter
The a width of 21MHz of band (megahertz) time, if now misalign frequency signal be acted upon, be directly inputted to
DEMO (Demodulator, demodulator) is demodulated, now arises that the situation of dropout, make
Become mosaic or can't lock frequency.In the embodiment of the present invention, before intermediate-freuqncy signal is input to DEMO, need
Frequency deviation is determined whether through frequency-discriminating circuit, in the case of having frequency deviation, the adjustment that frequency-discriminating circuit is exported
It is input to, after the filtering of level device after filtering, the VCO Voltage-Controlled oscillation circuit that CPU controls, after generating frequency of oscillation,
By CPU by IIC control Tuner chip frequency of oscillation is divided, obtain 3841MHz, 3842MHz,
The adjustment frequency of 3843MHz, 3844MHz, when adjusting frequency and being 3844MHz, the Tuner local oscillator of mixing
Frequency is also 3844MHz, and now TV signal frequency and Tuner local frequency are mixed, and produces zero intermediate frequency
Signal, be input to DEMO by zero intermediate frequency signals and be demodulated, it is to avoid inclined due to front end TV signal frequency
Move and cause mosaic or can't lock the problem generation of frequency, reached extraordinary CPCH reception effect.
In sum, after TV signal frequency with the local frequency mixing of high-frequency tuner, zero intermediate frequency letter is produced
Number time directly zero intermediate frequency signals is input to demodulator and is demodulated；At TV signal frequency and high-frequency tuner
Local frequency mixing after when producing non-zero if signal, enter before demodulator in intermediate-freuqncy signal and pass sequentially through
Frequency-discriminating circuit frequency discrimination, filter filtering, agitator frequency dividing obtains the adjustment frequency identical with TV signal frequency
Enter demodulator after being mixed as local frequency and the TV signal frequency of new high-frequency tuner to be demodulated；
Solve the mosaic brought because front end TV signal frequency occurs offseting or the problem that can't lock frequency, reach
Arrive extraordinary CPCH reception effect.
It is below the embodiment of the processing system of a kind of TV signal frequency of this programme skew, a kind of TV signal
The embodiment of the processing method that the embodiment of the processing system of frequency shift (FS) offsets based on a kind of TV signal frequency
Realize, description the most most in the embodiment of the processing system offset at a kind of TV signal frequency, refer to one
Plant the embodiment of the processing method of TV signal frequency skew.
Refer to Fig. 5, it is a kind of TV signal frequency skew provided in the specific embodiment of the invention
The circuit structure block diagram of processing system.As it can be seen, this system includes:
High-frequency tuner mixting circuit 510, receives TV signal frequency, by described TV signal frequency with high
Conversion tuner local frequency is mixed, and produces intermediate-freuqncy signal, exports described intermediate-freuqncy signal to frequency-discriminating circuit.
Frequency-discriminating circuit 520, receives described intermediate-freuqncy signal, according to the frequency of described intermediate-freuqncy signal Yu zero intermediate frequency signals
Rate variance is worth to adjust level, adjusts level to filter circuit output.
Frequency-discriminating circuit 520 specifically for: receive described intermediate-freuqncy signal, by the frequency of described intermediate-freuqncy signal with
The frequency of zero intermediate frequency signals compares, and obtains frequency-splitting, is adjusted level according to described frequency-splitting,
Described adjustment level is exported to filter circuit.
When described frequency-splitting is timing, obtain positive justification voltage；When described frequency-splitting is for, time negative, obtaining
Negative justification voltage.
Alternatively, the frequency discrimination chip of frequency-discriminating circuit is AD9901 chip.
Filter circuit 530, receives described adjustment level, is filtered adjusting level, obtains DC level,
DC level is exported to Voltage-Controlled oscillation circuit.
Voltage-Controlled oscillation circuit 540, receives described DC level, produces frequency of oscillation according to DC level, to
High-frequency tuner chip exports described frequency of oscillation.
Alternatively, the voltage controlled oscillator of voltage-controlled oscillator circuit is MC1648 agitator.
Central processing unit controls high-frequency tuner chip 550, divides described frequency of oscillation, is adjusted
Frequency, using described adjustment frequency as the local frequency being mixed medium-high frequency tuner.
This system also includes: output unit, when described frequency-splitting is zero, described intermediate-freuqncy signal is exported
To demodulator.
In sum, in the embodiment of the present invention, high-frequency tuner mixting circuit 510, receive TV signal frequency
Rate TV signal frequency, is mixed described TV signal frequency with high-frequency tuner local frequency, produces
Intermediate-freuqncy signal, exports described intermediate-freuqncy signal to frequency-discriminating circuit；Frequency-discriminating circuit 520, receives described intermediate-freuqncy signal,
Frequency-splitting according to described intermediate-freuqncy signal Yu zero intermediate frequency signals is adjusted level, adjusts to filter circuit output
Whole level；Filter circuit 530, receives described adjustment level, is filtered adjusting level, obtains direct current
Level, exports DC level to Voltage-Controlled oscillation circuit；Voltage-Controlled oscillation circuit 540, receives described DC level,
Produce frequency of oscillation according to DC level, export described frequency of oscillation to high-frequency tuner chip；Central authorities process
Device controls high-frequency tuner chip 550, divides described frequency of oscillation, is adjusted frequency, by described
Adjust the frequency high-frequency tuner local frequency as mixing.Intermediate-freuqncy signal enter DEMO (Demodulator,
Demodulator) pass sequentially through frequency-discriminating circuit frequency discrimination, filtering, agitator frequency dividing before, thus realize believing at TV
During the skew of number frequency frequency of occurrences, Tuner local frequency is also followed TV signal frequency offset together,
The frequency shift (FS) size making Tuner local frequency eventually is identical with the frequency shift (FS) size of TV signal frequency,
Realize the frequency that TV receiving system receives and there is no deviation, pinning program quickly, reach well to connect
Produce effects really, improve the Experience Degree of user.
The know-why of the present invention is described above in association with specific embodiment.These describe and are intended merely to explain this
The principle of invention, and limiting the scope of the invention can not be construed to by any way.Based on herein
Explaining, those skilled in the art need not pay performing creative labour can associate other tool of the present invention
Body embodiment, within these modes fall within protection scope of the present invention.
Claims (10)
1. the processing method of a TV signal frequency skew, it is characterised in that including:
The local frequency of TV signal frequency and high-frequency tuner is mixed, produces intermediate-freuqncy signal；
Described intermediate-freuqncy signal is input in frequency-discriminating circuit, according to the frequency of described intermediate-freuqncy signal Yu zero intermediate frequency signals
The output of rate difference adjusts level；
Described adjustment level is filtered, obtains DC level；
Described DC level is input in Voltage-Controlled oscillation circuit, produces frequency of oscillation；
Described frequency of oscillation is divided, is adjusted frequency, using described adjustment frequency as high in mixing
The local frequency of conversion tuner.
The processing method of TV signal frequency the most according to claim 1 skew, it is characterised in that institute
State the frequency-splitting output according to described intermediate-freuqncy signal with zero intermediate frequency signals and adjust level, including:
The frequency of described intermediate-freuqncy signal is compared with the frequency of zero intermediate frequency signals, obtains frequency-splitting；
Level is adjusted according to the output of described frequency-splitting.
The processing method of TV signal frequency the most according to claim 2 skew, it is characterised in that institute
State and adjust level according to the output of described frequency-splitting, particularly as follows:
When described frequency-splitting is timing, export positive justification level；
When described frequency-splitting is for time negative, export negative justification level.
The processing method of TV signal frequency the most according to claim 2 skew, it is characterised in that institute
State after obtaining frequency-splitting, also include:
When described frequency-splitting is zero, described intermediate-freuqncy signal is exported to demodulator.
The processing method of TV signal frequency the most according to claim 1 skew, it is characterised in that institute
State and described frequency of oscillation is divided, particularly as follows: by central processing unit by internal integrated circuit communication protocols
View controls the frequency divider of high-frequency tuner and divides described frequency of oscillation.
The processing method of TV signal frequency the most according to claim 1 skew, it is characterised in that institute
The frequency discrimination chip stating frequency-discriminating circuit is AD9901 chip；
The voltage controlled oscillator of described Voltage-Controlled oscillation circuit is MC1648 agitator.
7. the processing system of a TV signal frequency skew, it is characterised in that including:
High-frequency tuner mixting circuit, receives TV signal frequency TV signal frequency, is believed by described TV
Number frequency is mixed with high-frequency tuner local frequency, produces intermediate-freuqncy signal, described to frequency-discriminating circuit output
Intermediate-freuqncy signal；
Frequency-discriminating circuit, receives described intermediate-freuqncy signal, according to the frequency of described intermediate-freuqncy signal Yu zero intermediate frequency signals
Difference is adjusted level, adjusts level to filter circuit output；
Filter circuit, receives described adjustment level, is filtered adjusting level, obtains DC level,
DC level is exported to Voltage-Controlled oscillation circuit；
Voltage-Controlled oscillation circuit, receives described DC level, produces frequency of oscillation, Xiang Gao according to DC level
Conversion tuner chip exports described frequency of oscillation；
Central processing unit controls high-frequency tuner chip and divides described frequency of oscillation, is adjusted frequency,
Using described adjustment frequency as the high-frequency tuner local frequency being mixed.
The processing system of TV signal frequency the most according to claim 7 skew, it is characterised in that institute
State frequency-discriminating circuit particularly as follows:
Receive described intermediate-freuqncy signal, the frequency of described intermediate-freuqncy signal is compared with the frequency of zero intermediate frequency signals
Relatively, obtain frequency-splitting, be adjusted level according to described frequency-splitting, export described tune to filter circuit
Whole level.
The processing system of TV signal frequency the most according to claim 8 skew, it is characterised in that institute
State and be adjusted level according to described frequency-splitting, particularly as follows:
When described frequency-splitting is timing, obtain positive justification voltage；
When described frequency-splitting is for, time negative, obtaining negative justification voltage.
The processing system of TV signal frequency the most according to claim 7 skew, it is characterised in that also
Including:
Output unit, when described frequency-splitting is zero, exports described intermediate-freuqncy signal to demodulator；
The frequency discrimination chip of described frequency-discriminating circuit is AD9901 chip；
The voltage controlled oscillator of described Voltage-Controlled oscillation circuit is MC1648 agitator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610442688.8A CN105898163A (en) | 2016-06-20 | 2016-06-20 | Television signal frequency deviation processing method and system |
| PCT/CN2017/089233 WO2017219965A1 (en) | 2016-06-20 | 2017-06-20 | Method and system for processing frequency shift of television signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610442688.8A CN105898163A (en) | 2016-06-20 | 2016-06-20 | Television signal frequency deviation processing method and system |
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| CN105898163A true CN105898163A (en) | 2016-08-24 |
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| CN201610442688.8A Pending CN105898163A (en) | 2016-06-20 | 2016-06-20 | Television signal frequency deviation processing method and system |
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| WO (1) | WO2017219965A1 (en) |
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| WO2017219965A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳创维数字技术有限公司 | Method and system for processing frequency shift of television signal |
| CN108683447A (en) * | 2018-04-09 | 2018-10-19 | 中国电子科技集团公司第三十八研究所 | A kind of satellite communication forward feeder links Doppler frequency difference removing method and system |
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| CN108683447A (en) * | 2018-04-09 | 2018-10-19 | 中国电子科技集团公司第三十八研究所 | A kind of satellite communication forward feeder links Doppler frequency difference removing method and system |
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| WO2017219965A1 (en) | 2017-12-28 |
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