CN103763600B - Digital television signal receiving method and its system - Google Patents
Digital television signal receiving method and its system Download PDFInfo
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- CN103763600B CN103763600B CN201310747184.3A CN201310747184A CN103763600B CN 103763600 B CN103763600 B CN 103763600B CN 201310747184 A CN201310747184 A CN 201310747184A CN 103763600 B CN103763600 B CN 103763600B
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Abstract
The present invention provides a kind of digital television signal receiving method and system, it includes a chip with a low noise amplifier and a main receiver, an at least companion receiver and at least main shock leakage processing unit, chip receives the television channel input signal of an at least numeral, low noise amplifier is sent to main receiver and companion receiver after amplifying television channel input signal, main receiver exports one first television channel output signal after television channel input signal is mixed, companion receiver exports one second television channel output signal after television channel input signal is mixed, main shock leakage processing unit is used to detect, eliminate the main shock leakage of the main receiver included in the second television channel output signal, main shock so as to avoiding main receiver leaks sensitivity when interfering with slave television reception the second television channel output signal.
Description
Technical field
The present invention is related to a kind of digital television signal receiving method and its system, and espespecially one kind can be detected, eliminate this
Shake the digital television signal receiving method and its system of leakage.
Background technology
In the case of pursuing television video quality higher with the evolution of science and technology and user, digital television signal connects
Receipts system is popularized at leisure.
Fig. 1 is referred to, is the configuration diagram of known digital television signal reception system.As illustrated, DTV connects
Receipts system 100 is a system for being used to receive the television channel input signal of wireless digital, and it includes a low noise amplifier
(LNA) 13, one main receiver 14 and at least a companion receiver 15.
Low noise amplifier 13 can be via digital after an antenna 11 and one frequency reducing of reception of a low noise frequency demultiplier 12
After television channel input signal (S-in), and gain amplification television channel input signal (S-in) of the fixation of utilization one, will put
Television channel input signal (S-in) is respectively sent to main receiver 14 and companion receiver 15 after big.
Main receiver 14 includes one first low noise amplifier 141, one first frequency mixer 142 and a first ground concussion source
143.Main receiver 14 finely tunes the gain of the first low noise amplifier 141, so that the first low noise amplifier 141 is using appropriate
Television channel input signal (S-in) is amplified in gain again.Afterwards, the mixing television channel input signal of the first frequency mixer 142 (S-
In) with first ground concussion source (LO1) 143 producing one first television channel output signal (S-out1).Then, one is connected to master
The main frame TV of receiver 14 can put the first television channel output signal (S-out1) and watch television channel section via dialling
Purpose video content.
Separately, companion receiver 15 includes one second low noise amplifier 151, one second frequency mixer 152 and one second earthquake
Swing source 153.Companion receiver 15 finely tunes the gain of the second low noise amplifier 151, so that the second low noise amplifier 151 is using suitable
When gain amplify television channel input signal (S-in) again.Afterwards, the mixing of the second frequency mixer 142 television channel input signal
(S-in) it is local with second to shake source (LO2) 153 to produce one second television channel output signal (S-out2).Then, Ling Yilian
It is connected to by the slave TV of companion receiver 15 and puts the second television channel output signal (S-out2) and watch TV via dialling
The video content of channel program.Here, the middle setting multiple receiver 14,15 in digital TV receiving system 100 can be carried
The video signal for carrying out television channel program for many TVs is dialled and put.
Conventional two receiver 14,15 is respectively designed to possess individually the chip component of internal low noise amplifier 141,151,
The situation of local concussion leakage will can be avoided to be present between main receiver 14 and companion receiver 15, for example：It is low by first
The isolation of noise amplifier 141, the first ground concussion source (LO of main receiver 141) 143 be difficult to leak to companion receiver 15, with
The main shock of main receiver 14 is avoided to leak sensitivity when interfering with the reception television channel input signal of companion receiver 15.
From the above, two receivers 14,15 are respectively designed to possess individually the chip of internal low noise amplifier 141,151
Though component can avoid the situation that main shock is leaked, however, television channel input signal has to pass through the low noise amplifier of outside
13 and inside the two-stage of low noise amplifier 141/151 amplify action, then, among digital TV receiving system 100 will
Multiple low noise amplifiers 13,141,151 can be set and then increase many circuit layout areas.Furthermore, in order to avoid outer
Television channel input signal (S-in) after the amplification of low noise amplifier 13 in portion does not reach the requirement of the linearity, and outside is low miscellaneous
The gain amplifier of sound amplifier 13 can only often be fixed on a smaller gain (such as below 5db), so that a faint TV is frequently
Road input signal (S-in) may still be unable to reach the signal intensity required by reception system 100 after two-stage is amplified.
The content of the invention
A purpose of the invention, is to provide a kind of digital television signal reception system, and its system includes one has one
The chip and an at least companion receiver of low noise amplifier and a main receiver, using single low noise amplifier for being intended to transmit
To the action that the television channel input signal of main receiver and companion receiver is amplified, so as to effectively reducing Digital TV Receiving
The setting quantity of the middle signal amplification component of system and reduce circuit layout area according to this.
A purpose of the invention, is to provide a kind of digital television signal reception system, and its system is by low noise amplifier
It is integrated in the chip of main receiver, then main receiver or companion receiver can be dependent on the demand of signal intensity and directly adjust
The gain of low noise amplifier is controlled, a symbol is provided so that the gain for making low noise amplifier can carry out the adjustment of a larger multiplying power
Together in the television channel input signal of the signal intensity required by main receiver and companion receiver.
A purpose of the invention, is to provide a kind of digital television signal receiving method, and it utilizes digital processing mode to examine
The local leakage of the main receiver included in television channel output signal that survey, elimination companion receiver are exported, to avoid
Sensitivity and shadow when the local leakage of main receiver interferes with the television channel output signal of slave television reception companion receiver
Ring to the video signal quality dialled when discharging tv channel output signal.
In order to achieve the above object, the present invention provides a kind of digital television signal receiving method, a kind of digital television signal
Method of reseptance, its method is applied on a digital television signal reception system, and digital television signal reception system includes a tool
There are chip, at least a companion receiver and at least main shock leakage processing unit of a low noise amplifier and a main receiver, side
Method step includes：Chip is made to receive the television channel input signal of an at least numeral；Amplify TV frequently using low noise amplifier
Road input signal；Transmit the television channel input signal after amplifying to main receiver and companion receiver；It is mixed using main receiver
Television channel input signal and first ground shake source to produce one first television channel output signal；It is mixed using companion receiver
Frequency television channel input signal and one second local concussion source are producing one second television channel output signal；And make main shock leak
Processing unit detected using a digital processing mode, eliminate main receiver included in the second television channel output signal
Main shock is leaked.
In one embodiment of the invention, wherein digital processing mode the step of include：A Fourier transform program is performed to incite somebody to action
The the second television channel output signal for including local leakage is converted to frequency domain from time domain；A calculating operation average program is performed with by
Two television channel output signal calculating operation averages are offset and only obtain local leakage；And according to the frequency information in local leakage for the
Two television channel output signals perform a filter will locally leak the elimination among the second television channel output signal.
In one embodiment of the invention, wherein digital processing mode the step of include：Demodulation includes the second of local leakage
Television channel output signal is producing a demodulated signal；Compare demodulated signal with a sample signal to produce a difference signal；And
Make television channel input signal subtract difference signal and eliminated among the second television channel output signal so as to locally leak.
In one embodiment of the invention, wherein digital processing mode the step of include：Set an audio-frequency test signal；Using sound
Frequency test signal frequency sweep the second television channel output signal is compatible with the main shock leakage of audio-frequency test signal to obtain；And according in
The frequency information of local leakage performs a filter will locally leak from the second electricity for the second television channel output signal
Eliminated among tv channel output signal.
The present invention provides a kind of digital television signal reception system again, including：One chip, is used to receive an at least numeral
Television channel input signal, including：One low noise amplifier, is used to amplify television channel input signal；And a main receiver, even
The output end of low noise amplifier is connect, source is shaken using one first frequency mixer mixing television channel input signal and a first
To produce one first television channel output signal；An at least companion receiver, connects the output end of the low noise amplifier of chip, profit
Television channel input signal and one second local concussion source are mixed with one second frequency mixer to produce one second television channel to export
Signal；And at least main shock leakage processing unit, companion receiver is connected, it is used to detect, eliminates the second television channel output signal
The main shock leakage of the main receiver included in.
In one embodiment of the invention, wherein main shock leakage processing unit includes：One fast Flourier calculating operation average unit, from
Companion receiver receives the second television channel output signal for including local leakage, performs a Fourier transform program to include
There is the second television channel output signal of local leakage to be converted to frequency domain from time domain, then perform a calculating operation average program with by second
Television channel output signal calculating operation average is offset and only obtains local leakage；And a filter unit, connection fast Flourier averagely drills
Calculate unit and companion receiver, received via companion receiver the second television channel input signal for including local leakage and via
Fast Flourier calculating operation average unit obtains local leakage, defeated for the second television channel according to the frequency information in local leakage
Go out signal to perform a filter will locally leak the elimination among the second television channel output signal.
In one embodiment of the invention, wherein main shock leakage processing unit includes：One demodulating unit, receives via companion receiver
Include the second television channel output signal of local leakage, demodulation includes the second television channel output signal of local leakage
To produce a demodulated signal；One comparing unit, connects demodulating unit, is set with a sample signal, compares demodulated signal and sample
Signal is producing a difference signal；And an adder, comparing unit and companion receiver are connected, received via companion receiver and included
There is the second television channel output signal of local leakage and obtain difference signal via comparing unit, local leakage will be included
The second television channel output signal subtract difference signal so that locally leak among the second television channel output signal eliminate.
In one embodiment of the invention, wherein main shock leakage processing unit includes：One frequency sweep unit, receives via companion receiver
Include the second television channel output signal of local leakage, an audio-frequency test signal is set, using audio-frequency test signal frequency sweep
Second television channel output signal goes out to be compatible with the local of audio-frequency test signal with the frequency sweep from the second television channel output signal
Leakage；And a filter unit, frequency sweep unit and companion receiver are connected, received via companion receiver and include the second of local leakage
Television channel output signal and local leakage is obtained via frequency sweep unit, according to the frequency information in local leakage for second
Television channel output signal performs a filter will locally leak the elimination among the second television channel output signal.
In one embodiment of the invention, wherein main receiver main shock leakage from main receiver leak to low noise amplifier and
Companion receiver.
In one embodiment of the invention, wherein the television channel input signal of numeral is to accord with DVB-S, ATSC, ISDB-S
Or the signal of other digital TV broadcast standards specifications.
Brief description of the drawings
Fig. 1 is the configuration diagram of known digital television signal reception system；
Fig. 2 is the configuration diagram of digital television signal reception system one of the present invention preferred embodiment；
Companion receiver is exported Fig. 3 A when main receiver of the invention and companion receiver watch different channel program second
The spectrum diagram of television channel output signal；
Companion receiver is exported Fig. 3 B when main receiver of the invention and companion receiver watch same channel program second
The spectrum diagram of television channel output signal；
Fig. 4 is the structural representation of the first embodiment digital processing mode of main shock leakage processing unit of the present invention；
Fig. 5 is the structural representation of the second embodiment digital processing mode of main shock leakage processing unit of the present invention；
Fig. 6 is the structural representation of the 3rd embodiment digital processing mode of main shock leakage processing unit of the present invention；
Fig. 7 is the flow chart of a preferred embodiment of digital television signal receiving method of the present invention.
Wherein, reference：
The antenna of 100 digital TV receiving system 11
The low noise amplifier of 12 low noise frequency demultiplier 13
The low noise amplifier of 14 main receiver 141 first
The first of 142 first frequency mixer 143 ground concussion source
The low noise amplifier of 15 companion receiver 151 second
The local concussion source of 152 second frequency mixer 153 second
The low noise frequency demultiplier of 21 antenna 22
The chipset of 300 digital television signal reception system 30
The main receiver of 31 low noise amplifier 32
The first of 321 first frequency mixer 322 ground concussion source
3220 33 companion receivers of local leakage
The local concussion source of 331 second frequency mixer 332 second
40 main shocks leak processing unit
The filter unit of 41 fast Flourier calculating operation average unit 42
The comparing unit of 43 demodulating unit 44
The frequency sweep unit of 45 adder 46
47 filter units
Specific embodiment
Fig. 2 is referred to, is the configuration diagram of digital television signal reception system one of the present invention preferred embodiment.As schemed
Show, digital television signal reception system 300 includes a chip 30 and an at least companion receiver 33, chip 30 is put including a low noise
The big main receiver 32 of device 31 and.
Chip 30 can receive the digital television channel after a frequency reducing via an antenna 11 and a low noise frequency demultiplier 12
Input signal (S-in).This digital television channel input signal (S-in) for accord with DVB-S, ATSC, ISDB-S or other
The signal of digital TV broadcast standards specification.Low noise amplifier 31 is used to amplify television channel input signal (S-in), then will
Television channel input signal (S-in) after amplification is respectively transmitted main receiver 32 and companion receiver 33.
Main receiver 32 includes one first frequency mixer 321 and first ground concussion source 322, and the first frequency mixer 321 is connected
Output end and first ground the concussion source 322 of low noise amplifier 31.First frequency mixer 321 is received from low noise amplifier 31 and put
Television channel input signal (S-in) after big, mixing television channel input signal (S-in) and first ground concussion source 322 with
Export one first television channel output signal (S-out1).Then, one it is connected to by the main frame TV of main receiver 32 by dialling
Put the first television channel output signal (S-out1) and watch the video content of television channel program.
Separately, companion receiver 33 includes one second frequency mixer 331 and one second local concussion source 332, and the second frequency mixer 331 connects
Connect output end and the second local concussion source 332 of low noise amplifier 31.Second frequency mixer 331 is received from low noise amplifier 31
Television channel input signal (S-in) after amplification, mixing television channel input signal (S-in) and the second local concussion source 332
To export one second television channel output signal (S-out2).Then, lead to by another slave TV for being connected to companion receiver 33
Cross the video content dialled and put the second television channel output signal (S-out2) and watch television channel program.
Here, digital TV receiving system of the present invention 300 is connect using single low noise amplifier 31 for being intended to be sent to lead
The action that the television channel input signal (S-in) of receipts device 32 and companion receiver 33 is amplified, can effectively reduce digital electricity
Circuit layout area is reduced according to this depending on the setting quantity of signal amplification component among reception system 300.Furthermore, due to low noise
Amplifier 31 is integrated among the chip 30 of main receiver 32, and main receiver 32 or companion receiver 33 can be dependent on signal intensity
Demand and directly regulate and control the gain of low noise amplifier 31, one can be carried out with the gain for making low noise amplifier 31 larger
The adjustment (such as more than 10db) of multiplying power and provide one and accord with main receiver 32 or the signal intensity required by companion receiver 33
Television channel input signal (S-in).
Digital TV receiving system of the present invention 300 amplifies television channel input signal using single low noise amplifier 31
(S-in) though can obtain reduce circuit area benefit, however, main receiver 32 first ground concussion source 322 easily via
Power circuit, ground path or gain control circuit leak to the output end and companion receiver 33 of low noise amplifier 31, so that
The the second television channel output signal (S-out2) exported in companion receiver 33 usually contains the composition of local leakage 3220,
This local leakage 3220 will influence whether sensitivity during slave television reception the second television channel output signal (S-out2).
Fig. 3 A and Fig. 3 B are referred to, pair connects when main receiver respectively of the invention watches different channel program with companion receiver
Companion receiver institute when receiving the spectrum diagram of the second television channel output signal that device is exported and watching same channel program
The spectrum diagram of the second television channel output signal of output.As illustrated, companion receiver 33 connects from low noise amplifier 31
Television channel input signal (S-in) is received, mixing television channel input signal (S-in) and the second local concussion source 332 are with generation
One second television channel output signal spectrum 330, the centre frequency of this second television channel output signal spectrum 330 also can be the
The signal audio (signal tone) in two local concussion sources 332.
As shown in Figure 3A, if companion receiver 33 receives the television channel input of different channel program with main receiver 32 respectively
Signal, the signal audio (signal tone) of the local leakage 3220 of main receiver 32 will fall the second of companion receiver 33
Outside television channel output signal spectrum 330, local leakage 3220 will not interfere with to the second television channel output signal (S-
Out2), then, slave TV system can normally dial and put the second television channel output signal (S-out2).
Conversely, as shown in Figure 3 B, if companion receiver 33 receives the television channel of identical channel program with main receiver 32
Input signal, the signal audio (signal tone) of the local leakage 3220 of main receiver 32 will fall in companion receiver 33
The second television channel output signal (S-out2) is had influence in second television channel output signal spectrum 330, then, slave electricity
The second poor quality television channel output signal (S-out2) of video signal is released depending on that will dial.
Continue, referring again to Fig. 2, in order to avoid the local leakage 3220 of main receiver 32 interferes with slave television reception
Sensitivity during two television channel output signal (S-out2), the present invention is provided with a main shock and lets out in the output end of companion receiver 33
Drain process unit 40.Main shock leaks processing unit 40 and receives second TV with local leakage 3220 frequently from companion receiver 33
Road output signal (S-out2), is detected and eliminated among the second television channel output signal (S-out2) using digital processing mode
Comprising local leakage 3220, there is no the second television channel output signal (S- of local leakage noise composition to provide one
Out2 ') to slave TV.Here, leaking the setting of processing unit 40 via main shock, can detect, eliminate the second TV frequently
Local leakage 3220 included in road output signal (S-out2 '), to avoid local leakage 3220 from interfering with slave TV
Sensitivity when receiving the second television channel output signal (S-out2 ') and have influence on to dial and put the second television channel output signal
Video signal quality when (S-out2 ').
Main shock of the present invention leakage processing unit 40 be can select to take different digital processing modes to detect,
Eliminate the local leakage 3220 included in the second television channel output signal (S-out2), its digital processing that can be taken
Mode is as described below：
Fig. 4 is referred to, is the structural representation of the first embodiment of main shock leakage processing unit of the present invention.The present embodiment sheet
Shake leakage processing unit 40 includes a fast Flourier calculating operation average unit 41 and a filter unit 42, and filter unit 42 is connected soon
Fast Fourier calculating operation average unit 41.
Fast Flourier calculating operation average unit 41 includes the second of local leakage (LO-lk) from the reception of companion receiver 33 one
Television channel output signal (S-out2), performs a Fourier transform program and includes the of local leakage (LO-lk) with by this
Two television channel output signals (S-out2) are converted to frequency domain from time domain, afterwards, then perform a calculating operation average program with by the cycle
Property second television channel output signal (S-out2) calculating operation average offset only obtain single-frequency a local leakage (LO-lk).
Filter unit 42 includes a wave filter (such as band refuses wave filter), and it receives one and includes this via companion receiver 33
Ground leaks the second television channel output signal (S-out2) of (LO-lk) and is taken via fast Flourier calculating operation average unit 41
Obtain the frequency information for locally leaking (LO-lk).Filter unit 41 is dependent on the frequency information of local leakage (LO-lk), by the
The signal for corresponding to local leakage (LO-lk) frequency in two television channel output signals (S-out2) is eliminated, you can to take
Obtaining one does not have the second television channel output signal (S-out2 ') of local leakage noise.
Fig. 5 is referred to, is the structural representation of the second embodiment of main shock leakage processing unit of the present invention.The present embodiment sheet
Shake leakage processing unit 40 includes a demodulating unit 43, a comparing unit 44 and an adder 45, and comparing unit 44 is arranged on solution
Adjust between unit 43 and adder 45.
Demodulating unit 43 receives second television channel for including local leakage (LO-lk) and exports letter from companion receiver 33
Number (S-out2), demodulates the second television channel output signal (S-out2) that this includes local leakage (LO-lk) to produce one
Demodulated signal with local leakage composition.
Comparing unit 44 is set with a sample signal, and this sample signal is an idealization ripple without local leakage noise
Shape signal, it can be demodulated by a second television channel output signal (S-out2) for being not affected by local leakage interference.Than
Demodulated signal is compared with Utopian sample signal compared with unit 44, to produce a difference signal, this difference signal is also
It can be the signal audio (signal tone) of local leakage (LO-lk).
Adder 45 receives second television channel for including local leakage (LO-lk) and exports letter via companion receiver 33
Number (S-out2) and difference signal is received via comparing unit 44, this is included the second TV of local leakage (LO-lk)
Channel output signal (S-out2) subtracts difference signal, you can not have the second television channel of local leakage noise to obtain one
Output signal (S-out2 ').
Fig. 6 is referred to, is the structural representation of the 3rd embodiment of main shock leakage processing unit of the present invention.The present embodiment sheet
Shake leakage processing unit 40 includes a frequency sweep unit 46 and a filter unit 47, the connection frequency sweep of filter unit 47 unit 46.
The present embodiment main shock leakage processing unit 40 is set with an audio-frequency test signal (tone test signal), this sound
Frequency test signal may be referred to be shaken in first source 322 and carry out relative setting.Frequency sweep unit 46 is received from companion receiver 33
This includes the second television channel output signal (S-out2) of local leakage (LO-lk), using audio-frequency test signal frequency sweep the
Two television channel output signals (S-out2), go out one and are compatible with sound with the frequency sweep from the second television channel output signal (S-out2)
The local leakage (LO-lk) of frequency test signal.
The frequency information of the local leakage (LO-lk) that filter unit 47 goes out according to frequency sweep, by the output of the second television channel
The signal for corresponding to local leakage (LO-lk) frequency in signal (S-out2) is eliminated, and obtaining one does not have local leakage
Second television channel output signal (S-out2 ') of noise.
From the above, main shock leakage processing unit 40 of the present invention is detected using different digital processing modes, eliminates second
The local leakage 3220 of the main receiver 32 included in television channel output signal (S-out2 '), to avoid local leakage
3220 interfere with sensitivity during slave television reception the second television channel output signal (S-out2 ').Certainly, above-mentioned three kinds of numbers
Word processing mode is only some embodiments that main shock of the present invention leaks processing unit 40, and knowing this those skilled in the art should
Understand that the digital processing mode of main shock leakage processing unit 40 of the present invention is not limited to this.
Fig. 7 is referred to, is the flow chart of a preferred embodiment of digital television signal receiving method of the present invention.Refering in figure
Shown in 2, first, step S501 is performed, when digital TV receiving system of the present invention 300 is operated, chip 30 can be via antenna 21
And low noise amplifier 22 receives the digital television channel input signal (S-in) after an at least frequency reducing.
Step S502 is performed, chip 30 amplifies television channel input signal (S-in) using low miscellaneous amplifier 31.Then, hold
Row step S511, the television channel input signal (S-in) after amplification is sent to main receiver 32, or, step S521 is performed,
Television channel input signal (S-in) after amplification is sent to companion receiver 33.
When the television channel input signal (S-in) after amplification is sent to main receiver 32, step S512 is performed, master connects
Receive device 32 and be mixed television channel input signal (S-in) and first ground concussion source 322 using the first frequency mixer 321, to produce one
First television channel output signal (S-out1).Then, main frame TV can put the first television channel output signal (S- by dialling
Out1 the video content of television channel program) is watched.
Or, when the television channel input signal (S-in) after amplification is sent to companion receiver 33, step S522 is performed,
Companion receiver 33 is mixed television channel input signal (S-in) and the second local concussion source 332 using the second frequency mixer 331, to produce
Raw one second television channel output signal (S-out2) is simultaneously sent to main shock leakage processing unit 40.
Then, step S523 is performed, the main shock leakage selection of processing unit 40 takes different digital processing mode to detect, eliminate
The local leakage 3220 of the main receiver 32 included in the second television channel output signal (S-out2), at its various numeral
The process step difference of reason mode is as described below：
Refering in shown in Fig. 4, the process step of the first digital processing mode is：Fast Flourier calculating operation average unit 41
Perform a Fourier transform program and turned from time domain so that this to be included the second television channel output signal (S-out2) of (LO-lk)
Frequency domain is changed to, afterwards, then a calculating operation average program is performed and is supported with by second television channel output signal (S-out2) calculating operation average
Disappears the local leakage (LO-lk) that only obtain；Then, filter unit 41 is dependent on the frequency information of local leakage (LO-lk), by the
The signal for corresponding to local leakage (LO-lk) frequency in two television channel output signals (S-out2) is eliminated, you can to take
Obtaining one does not have the second television channel output signal (S-out2 ') of local leakage noise.
Separately, refering in shown in Fig. 5, the process step of second digital processing mode is：Demodulating unit 43 demodulates this and includes
There is the second television channel output signal (S-out2) of local leakage (LO-lk) to produce a demodulation with local leakage composition
Signal；Afterwards, with Utopian sample signal be compared demodulated signal by comparing unit 44, to produce a difference signal；
Then, the second television channel output signal (S-out2) for including local leakage (LO-lk) is subtracted difference by adder 45
Signal, you can there is no the second television channel output signal (S-out2 ') of local leakage noise to obtain one.
Also, referring in shown in Fig. 6, the process step of the third digital processing mode is：Frequency sweep unit 46 utilizes an audio
Test signal frequency sweep the second television channel output signal (S-out2), sweeps with from the second television channel output signal (S-out2)
Occur frequently a local leakage (LO-lk) for being compatible with audio-frequency test signal；Then, the local leakage that filter unit 47 goes out according to frequency sweep
(LO-lk) frequency information, will correspond to local leakage (LO-lk) frequency in the second television channel output signal (S-out2)
Signal eliminated, and obtaining one does not have the second television channel output signal (S-out2 ') of local leakage noise.
By after above-mentioned digital processing program, slave TV does not have local leakage noise composition by that can receive one
Second television channel output signal (S-out2 '), and the second television channel output signal (S-out2 ') is put to watch by dialling
The video content of television channel program.
As described above, a preferred embodiment only of the invention, not for limiting the scope that the present invention is implemented,
Impartial change and modification carried out by i.e. all shapes according to described in scope of the present invention patent, construction, feature and spirit, all should wrap
Include in claim of the invention.
Claims (10)
1. a kind of digital television signal receiving method, it is characterised in that apply on a digital television signal reception system, number
Word television signal receiving system include one have a low noise amplifier and the chip of a main receiver, an at least companion receiver and
An at least main shock leaks processing unit, and method and step includes：
Chip is made to receive the television channel input signal of an at least numeral；
Amplify television channel input signal using the low noise amplifier in chip；
Low noise amplifier in chip transmits the television channel input signal after amplifying to main receiver and companion receiver；
Main receiver is made to shake source to produce one using one first frequency mixer mixing television channel input signal and a first
First television channel output signal；
Companion receiver is made to be mixed television channel input signal and one second local concussion source to produce one using one second frequency mixer
Second television channel output signal；And
Make main shock leak processing unit and the second television channel output signal is received by companion receiver, and utilize a digital processing mode
The main shock leakage of the main receiver included in detection, the second television channel output signal of elimination.
2. digital television signal receiving method as claimed in claim 1, it is characterised in that wrap the step of the digital processing mode
Include：
Perform a Fourier transform program and turned from time domain so that this to be included the second television channel output signal of main shock leakage
It is changed to frequency domain；
Perform a calculating operation average program and let out so that the second television channel output signal calculating operation average counteracting is only obtained into the main shock
Leakage；And
One filter is performed with should for the second television channel output signal according to the frequency information leaked in the main shock
Main shock is leaked and eliminated among the second television channel output signal.
3. digital television signal receiving method as claimed in claim 1, it is characterised in that wrap the step of the digital processing mode
Include：
Demodulate this include the main shock leakage the second television channel output signal to produce a demodulated signal；
Compare the demodulated signal with a sample signal to produce a difference signal；And
The television channel input signal is made to subtract the difference signal so that the main shock is leaked from the second television channel output signal
Among eliminate.
4. digital television signal receiving method as claimed in claim 1, it is characterised in that wrap the step of the digital processing mode
Include：
Set an audio-frequency test signal；
Using the audio-frequency test signal frequency sweep, the second television channel output signal is compatible with the audio-frequency test signal to obtain
The main shock is leaked；And
One filter is performed with should for the second television channel output signal according to the frequency information leaked in the main shock
Main shock is leaked and eliminated among the second television channel output signal.
5. a kind of digital television signal reception system, it is characterised in that including：
One chip, is used to receive the television channel input signal of an at least numeral, including：
One low noise amplifier, is used to amplify television channel input signal；And
One main receiver, connects the output end of low noise amplifier, and receives television channel input signal by low noise amplifier,
Shake source to produce one first television channel defeated using one first frequency mixer mixing television channel input signal and a first
Go out signal；
An at least companion receiver, connects the output end and main receiver of the low noise amplifier of chip, and by the low noise of chip
Amplifier receives television channel input signal, and television channel input signal and one second earthquake are mixed using one second frequency mixer
Source is swung to produce one second television channel output signal；And
An at least main shock leaks processing unit, connects the output end of companion receiver, is used to detect, eliminates the output of the second television channel
The main shock leakage of the main receiver included in signal.
6. digital television signal reception system as claimed in claim 5, it is characterised in that the main shock leaks processing unit bag
Include：
One fast Flourier calculating operation average unit, from the companion receiver receive this include the main shock leakage the second TV frequently
Road output signal, performs a Fourier transform program this is included the second television channel output signal of main shock leakage
Frequency domain is converted to from time domain, then performs a calculating operation average program and offset only with by the second television channel output signal calculating operation average
Obtain main shock leakage；And
One filter unit, connects the fast Flourier calculating operation average unit and the companion receiver, and being received via the companion receiver should
Include the second television channel input signal of main shock leakage and obtained via the fast Flourier calculating operation average unit and be somebody's turn to do
Main shock is leaked, and a filter is performed for the second television channel output signal according to the frequency information leaked in the main shock
Eliminated among the second television channel output signal with by main shock leakage.
7. digital television signal reception system as claimed in claim 5, it is characterised in that the main shock leaks processing unit bag
Include：
One demodulating unit, the second television channel output signal for including main shock leakage, solution are received via the companion receiver
This is adjusted to include the second television channel output signal of main shock leakage to produce a demodulated signal；
One comparing unit, connects the demodulating unit, is set with a sample signal, compares the demodulated signal with the sample signal to produce
Bear a difference signal；And
One adder, connects the comparing unit and the companion receiver, and receiving this via the companion receiver includes main shock leakage
The second television channel output signal and obtain the difference signal via the comparing unit, by this include the main shock leakage
The second television channel output signal subtract difference signal so that the main shock leak among the second television channel output signal
Eliminate.
8. digital television signal reception system as claimed in claim 5, it is characterised in that the main shock leaks processing unit bag
Include：
One frequency sweep unit, the second television channel output signal for including main shock leakage is received via the companion receiver, if
A fixed audio-frequency test signal, using audio-frequency test signal frequency sweep the second television channel output signal with from second TV frequently
Frequency sweep goes out to be compatible with the main shock leakage of audio-frequency test signal in road output signal；And
One filter unit, connects the frequency sweep unit and the companion receiver, receives this via the companion receiver and includes the main shock and lets out
Leakage the second television channel output signal and via the frequency sweep unit obtain the main shock leak, according to what is leaked in the main shock
Frequency information performs a filter and is leaked from second TV frequently with by the main shock for the second television channel output signal
Eliminated among road output signal.
9. digital television signal reception system as claimed in claim 5, it is characterised in that the main shock leakage of the main receiver
The low noise amplifier and the companion receiver are leaked to from the main receiver.
10. digital television signal reception system as claimed in claim 5, it is characterised in that digital television channel input
Signal is the signal for according with DVB-S, ATSC, ISDB-S or other digital TV broadcast standards specifications.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310747184.3A CN103763600B (en) | 2013-12-25 | 2013-12-25 | Digital television signal receiving method and its system |
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| CN201310747184.3A CN103763600B (en) | 2013-12-25 | 2013-12-25 | Digital television signal receiving method and its system |
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| CN103763600A CN103763600A (en) | 2014-04-30 |
| CN103763600B true CN103763600B (en) | 2017-06-20 |
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Citations (3)
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| CN1278137A (en) * | 1999-06-22 | 2000-12-27 | 阿尔卑斯电气株式会社 | Modulation assembly for digital TV set |
| CN1722721A (en) * | 2004-07-09 | 2006-01-18 | Sst通信公司 | LO leakage and sideband image calibration system and method |
| US8145162B2 (en) * | 2008-10-31 | 2012-03-27 | Sony Corporation | Tuner device |
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|---|---|---|---|---|
| JP3104523B2 (en) * | 1994-03-31 | 2000-10-30 | 松下電器産業株式会社 | Double super tuner |
| US20020163391A1 (en) * | 2001-03-01 | 2002-11-07 | Peterzell Paul E. | Local oscillator leakage control in direct conversion processes |
| US7095454B2 (en) * | 2003-07-30 | 2006-08-22 | Maxim Integrated Products, Inc. | Broadband single conversion tuner integrated circuits |
| JP2007124290A (en) * | 2005-10-28 | 2007-05-17 | Alps Electric Co Ltd | Dual type digital television tuner |
| US7719352B2 (en) * | 2007-03-13 | 2010-05-18 | Qualcomm Incorporated | Active circuits with isolation switches |
| CN201750499U (en) * | 2010-02-05 | 2011-02-16 | 东莞德英电子通讯设备有限公司 | Digital television provided with ultra-high frequency amplifier |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278137A (en) * | 1999-06-22 | 2000-12-27 | 阿尔卑斯电气株式会社 | Modulation assembly for digital TV set |
| CN1722721A (en) * | 2004-07-09 | 2006-01-18 | Sst通信公司 | LO leakage and sideband image calibration system and method |
| US8145162B2 (en) * | 2008-10-31 | 2012-03-27 | Sony Corporation | Tuner device |
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| CN103763600A (en) | 2014-04-30 |
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Address after: Science Park, Hsinchu, Taiwan, China Road 6-5, building 5 Patentee after: Dafa Technology Co.,Ltd. Address before: Science Park, Hsinchu, Taiwan, China Road 6-5, building 5 Patentee before: AIROHA TECHNOLOGY CORP. |
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