CN103763600A - Digital television signal receiving method and system - Google Patents
Digital television signal receiving method and system Download PDFInfo
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- CN103763600A CN103763600A CN201310747184.3A CN201310747184A CN103763600A CN 103763600 A CN103763600 A CN 103763600A CN 201310747184 A CN201310747184 A CN 201310747184A CN 103763600 A CN103763600 A CN 103763600A
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Abstract
The invention provides a digital television signal receiving method and system. The digital television signal receiving system comprises a chip, at least one auxiliary receiver and at least one proper shock leakage processing unit, wherein the chip is provided with a low-noise amplifier and a main receiver, the chip receives at least one digital television channel input signal, the television channel input signal is transmitted to the main receiver or the auxiliary receiver after being amplified by the low-noise amplifier, the main receiver mixes frequencies of the television channel input signal and then outputs a first television channel output signal, the auxiliary receiver mixes the frequencies of the television channel input signal and then outputs a second television channel output signal, and the proper shock leakage processing unit is used for detecting and eliminating proper shock leakage, contained in the second television channel output signal, of the main receiver so that the proper shock leakage of the main receiver can be prevented from affecting the sensitivity when an auxiliary engine television receives the second television channel output signal.
Description
Technical field
The present invention is relevant for a kind of digital television signal receiving method and system thereof, espespecially a kind ofly can detect, eliminate digital television signal receiving method and the system thereof that main shock leaks.
Background technology
Along with scientific and technological evolution and user pursue in the situation of higher television video quality, the receiving system of digital television signal is universal at leisure.
Referring to Fig. 1, is the configuration diagram of known digital television signal receiving system.As shown in the figure, digital TV receiving system 100 is one in order to receive the system of the television channel input signal of wireless digital, and it comprises the main receiver 14 of a low noise amplifier (LNA) 13, one and at least one companion receiver 15.
The digital television channel input signal (S-in) that low noise amplifier 13 can receive after a frequency reducing via an antenna 11 and a low noise frequency demultiplier 12, and utilize a fixing gain to amplify after television channel input signal (S-in), with television channel input signal (S-in) after amplifying, be sent to respectively main receiver 14 and companion receiver 15.
Separately, companion receiver 15 comprises one second low noise amplifier 151, one second frequency mixer 152 and one second local concussion source 153.The gain of companion receiver 15 fine setting the second low noise amplifiers 151, so that the second low noise amplifier 151 utilizes suitable gain again to amplify television channel input signal (S-in).Afterwards, the second frequency mixer 142 mixing television channel input signals (S-in) and the second local concussion source (LO2) 153 are to produce one second television channel output signal (S-out2)., another slave TV that is connected in companion receiver 15 can be via dialling the video signal content of putting the second television channel output signal (S-out2) and watching television channel program.At this, the video signal that a plurality of receivers 14,15 are set in digital TV receiving system 100 can provide many TVs to carry out television channel program is dialled and is put.
Two receivers 14,15 were designed to respectively have individually the chip component of inner low noise amplifier 141,151 in the past, can avoid the situation that local concussion is leaked to be present between main receiver 14 and companion receiver 15, for example: by the isolation of the first low noise amplifier 141, the first of main receiver 14 ground concussion source (LO
1) 143 be difficult for leaking to companion receiver 15, the sensitivity while receiving television channel input signal to avoid the main shock of main receiver 14 to leak interfering with companion receiver 15.
From the above, though two receivers 14,15 are designed to respectively to have individually the situation that the chip component of inner low noise amplifier 141,151 can avoid main shock to leak, yet, the action that television channel input signal must amplify through low noise amplifier 141/151 two-stage of outside low noise amplifier 13 and inside, so, a plurality of low noise amplifiers 13,141,151 will be set among digital TV receiving system 100 and then increase many circuit layout area.Moreover, the requirement that television channel input signal (S-in) after amplifying for fear of the low noise amplifier 13 by outside does not reach the linearity, the gain amplifier of outside low noise amplifier 13 often can only be fixed on a less gain (as following in 5db), so that a faint television channel input signal (S-in) still possibly cannot reach the desired signal strength signal intensity of receiving system 100 after two-stage is amplified.
Summary of the invention
An object of the present invention, be to provide a kind of digital television signal receiving system, its system includes chip and an at least one companion receiver with a low noise amplifier and a main receiver, utilize single low noise amplifier to deliver to for tendency to develop the action that the television channel input signal of main receiver and companion receiver amplifies, so as to the magnitude setting of the middle signal amplification component of effective minimizing digital TV receiving system and reduce according to this circuit layout area.
An object of the present invention, be to provide a kind of digital television signal receiving system, its system is integrated in low noise amplifier in the chip of main receiver, the demand that main receiver or companion receiver can be dependent on signal strength signal intensity directly regulates and controls the gain of low noise amplifier, to make the gain of low noise amplifier can carry out one, provides a television channel input signal that accords with main receiver and the desired signal strength signal intensity of companion receiver compared with the adjustment of large multiplying power.
An object of the present invention, be to provide a kind of digital television signal receiving method, leak its this locality that utilizes digital processing mode to detect, eliminate the main receiver comprising among the television channel output signal that companion receiver exports, the sensitivity when avoiding this locality of main receiver to leak the television channel output signal that interferes with slave television reception companion receiver and have influence on the video signal quality while dialling placing TV channel output signal.
In order to achieve the above object, the invention provides a kind of digital television signal receiving method, a kind of digital television signal receiving method, its method is applied on a digital television signal receiving system, digital television signal receiving system comprises that one has the chip of a low noise amplifier and a main receiver, at least one companion receiver and at least one main shock leakage processing unit, and method step comprises: make chip receive the television channel input signal of at least one numeral; Utilize low noise amplifier to amplify television channel input signal; Television channel input signal after transmission is amplified is to main receiver and companion receiver; Utilize main receiver mixing television channel input signal and a first and shake source to produce one first television channel output signal; Utilize companion receiver mixing television channel input signal and one second local concussion source to produce one second television channel output signal; And make main shock leak the main shock leakage that processing unit by using one digital processing mode detected, eliminated the main receiver comprising among the second television channel output signal.
In one embodiment of the invention, the step of wherein digital processing mode comprises: the fourier transform program of carrying out is to be converted to frequency domain by including local the second television channel output signal of leaking from time domain; The calculating operation average program of carrying out is to offset the second television channel output signal calculating operation average only to obtain local leakage; And the frequency information that is pursuant to local leakage is carried out a filter so that this locality is leaked and to be eliminated among the second television channel output signal for the second television channel output signal.
In one embodiment of the invention, the step of wherein digital processing mode comprises: demodulation includes local the second television channel output signal of leaking to produce a restituted signal; Relatively restituted signal and a sample signal are to produce a difference signal; And make television channel input signal deduct difference signal so that local leakage eliminated among the second television channel output signal.
In one embodiment of the invention, the step of wherein digital processing mode comprises: set an audio-frequency test signal; The main shock that utilizes audio-frequency test signal frequency sweep the second television channel output signal to be compatible with audio-frequency test signal to obtain leaks; And the frequency information that is pursuant to local leakage is carried out a filter so that this locality is leaked and to be eliminated among the second television channel output signal for the second television channel output signal.
The present invention provides again a kind of digital television signal receiving system, comprising: a chip, in order to receive the television channel input signal of at least one numeral, comprising: a low noise amplifier, in order to amplify television channel input signal; And a main receiver, connect the output of low noise amplifier, utilize one first frequency mixer mixing television channel input signal and a first and shake source to produce one first television channel output signal; At least one companion receiver, the output of the low noise amplifier of connection chip, utilizes one second frequency mixer mixing television channel input signal and one second local concussion source to produce one second television channel output signal; And at least one main shock leakage processing unit, auxiliary connection receiver, leaks in order to detect, to eliminate the main shock of the main receiver comprising among the second television channel output signal.
In one embodiment of the invention, wherein main shock leakage processing unit comprises: a fast Flourier calculating operation average unit, from companion receiver, receive and include local the second television channel output signal of leaking, the fourier transform program of carrying out is to be converted to frequency domain by including local the second television channel output signal of leaking from time domain, then the calculating operation average program of carrying out is to offset the second television channel output signal calculating operation average only to obtain local leakage; An and filter unit, connect fast Flourier calculating operation average unit and companion receiver, via companion receiver, receive and include local the second television channel input signal leaking and obtain local leakage via fast Flourier calculating operation average unit, be pursuant to local frequency information of leaking and carry out a filter so that this locality is leaked and to be eliminated for the second television channel output signal among the second television channel output signal.
In one embodiment of the invention, wherein main shock leakage processing unit comprises: a demodulating unit, via companion receiver, receive and include local the second television channel output signal of leaking, demodulation includes local the second television channel output signal of leaking to produce a restituted signal; One comparing unit, connects demodulating unit, is set with a sample signal, and relatively restituted signal and sample signal are to produce a difference signal; An and adder, connect comparing unit and companion receiver, via companion receiver, receive and include local the second television channel output signal of leaking and obtain difference signal via comparing unit, by including, local the second television channel output signal of leaking deducts difference signal so that local leakage eliminated among the second television channel output signal.
In one embodiment of the invention, wherein main shock leakage processing unit comprises: a frequency sweep unit, via companion receiver, receive and include local the second television channel output signal of leaking, set an audio-frequency test signal, leak this locality that utilizes audio-frequency test signal frequency sweep the second television channel output signal to go out to be compatible with audio-frequency test signal with frequency sweep from the second television channel output signal; An and filter unit, connect frequency sweep unit and companion receiver, via companion receiver, receive and include local the second television channel output signal of leaking and obtain local leakage via frequency sweep unit, be pursuant to local frequency information of leaking and carry out a filter so that this locality is leaked and to be eliminated for the second television channel output signal among the second television channel output signal.
In one embodiment of the invention, wherein the main shock of main receiver leaks and leaks to low noise amplifier and companion receiver from main receiver.
In one embodiment of the invention, wherein the television channel input signal of numeral is the signal that accords with DVB-S, ATSC, ISDB-S or other digital television broadcasting standard criterions.
Accompanying drawing explanation
Fig. 1 is the configuration diagram of known digital television signal receiving system;
Fig. 2 is the configuration diagram of digital television signal receiving system one preferred embodiment of the present invention;
Fig. 3 A is the spectrum diagram of the main receiver of the present invention and companion receiver the second television channel output signal that companion receiver is exported while watching different channel program;
Fig. 3 B is the spectrum diagram of the main receiver of the present invention and companion receiver the second television channel output signal that companion receiver is exported while watching same channel program;
Fig. 4 is the structural representation that main shock of the present invention leaks the first embodiment digital processing mode of processing unit;
Fig. 5 is the structural representation that main shock of the present invention leaks the second embodiment digital processing mode of processing unit;
Fig. 6 is the structural representation that main shock of the present invention leaks the 3rd embodiment digital processing mode of processing unit;
Fig. 7 is the flow chart of a preferred embodiment of digital television signal receiving method of the present invention.
Wherein, Reference numeral:
100 digital TV receiving system 11 antennas
12 low noise frequency demultiplier 13 low noise amplifiers
14 main receiver 141 first low noise amplifiers
142 first frequency mixer 143 concussion sources, first ground
15 companion receiver 151 second low noise amplifiers
152 second frequency mixer 153 second local concussion sources
21 antenna 22 low noise frequency demultipliers
300 digital television signal receiving system 30 chipsets
The main receiver of 31 low noise amplifier 32
321 first frequency mixer 322 concussion sources, first ground
3220 local 33 companion receivers that leak
331 second frequency mixer 332 second local concussion sources
40 main shocks leak processing unit
41 fast Flourier calculating operation average unit 42 filter units
43 demodulating unit 44 comparing units
45 adder 46 frequency sweep unit
47 filter units
Embodiment
Referring to Fig. 2, is the configuration diagram of digital television signal receiving system one preferred embodiment of the present invention.As shown in the figure, digital television signal receiving system 300 comprises a chip 30 and at least one companion receiver 33, and chip 30 comprises a low noise amplifier 31 and a main receiver 32.
The digital television channel input signal (S-in) that chip 30 can receive after a frequency reducing via an antenna 11 and a low noise frequency demultiplier 12.This digital television channel input signal (S-in) is for according with the signal of DVB-S, ATSC, ISDB-S or other digital television broadcasting standard criterions.Low noise amplifier 31 is in order to amplify television channel input signal (S-in), then the television channel input signal (S-in) after amplifying is transmitted respectively to main receiver 32 and companion receiver 33.
Separately, companion receiver 33 comprises that one second frequency mixer 331 and one second local concussion source 332, the second frequency mixers 331 connect output and the second local concussion source 332 of low noise amplifier 31.The television channel input signal (S-in) that the second frequency mixer 331 receives amplifying from low noise amplifier 31, mixing television channel input signal (S-in) and the second local concussion source 332 are to export one second television channel output signal (S-out2)., another slave TV that is connected in companion receiver 33 can be put the video signal content that the second television channel output signal (S-out2) watches television channel program by dialling.
At this, digital TV receiving system 300 of the present invention utilizes single low noise amplifier 31 to deliver to for tendency to develop the action that the television channel input signal (S-in) of main receiver 32 and companion receiver 33 amplifies, and can effectively reduce the magnitude setting of signal amplification component among digital TV receiving system 300 and reduce according to this circuit layout area.Moreover, because low noise amplifier 31 is integrated among the chip 30 of main receiver 32, main receiver 32 or companion receiver 33 can be dependent on the demand of signal strength signal intensity and directly regulate and control the gain of low noise amplifier 31, and a television channel input signal (S-in) that accords with main receiver 32 or companion receiver 33 desired signal strength signal intensities is provided to make the gain of low noise amplifier 31 can carry out the adjustment (more than 10db) of a larger multiplying power.
Digital TV receiving system 300 of the present invention utilizes single low noise amplifier 31 to amplify television channel input signal (S-in) though can obtain the benefit of dwindling circuit area, yet, the concussion source 322, first ground of main receiver 32 is easily via power circuit, ground path or gain are controlled line leak to output and the companion receiver 33 of low noise amplifier 31, so that the second television channel output signal (S-out2) that companion receiver 33 is exported often includes local 3220 the composition that leaks, sensitivity when this local leakage 3220 will have influence on slave television reception the second television channel output signal (S-out2).
Refer to Fig. 3 A and Fig. 3 B, the spectrum diagram of the second television channel output signal that when being respectively the spectrum diagram of the main receiver of the present invention and companion receiver the second television channel output signal that companion receiver is exported while watching different channel program and watching same channel program, companion receiver is exported.As shown in the figure, companion receiver 33 receives television channel input signal (S-in) from low noise amplifier 31, mixing television channel input signal (S-in) and the second local concussion source 332 are to produce one second television channel output signal spectrum 330, and the centre frequency of this second television channel output signal spectrum 330 also can be the signal audio frequency (signal tone) in the second local concussion source 332.
As shown in Figure 3A, if companion receiver 33 and main receiver 32 receive respectively the television channel input signal of different channel program, the signal audio frequency (signal tone) of this locality leakage 3220 of main receiver 32 will drop on outside the second television channel output signal spectrum 330 of companion receiver 33, local leakage 3220 will can not interfere with the second television channel output signal (S-out2),, slave TV system can normally dial and put the second television channel output signal (S-out2).
Otherwise, as shown in Figure 3 B, if the television channel input signal of the channel program that companion receiver 33 is identical with main receiver 32 receptions, this locality of main receiver 32 is leaked in the second television channel output signal spectrum 330 that 3220 signal audio frequency (signal tone) will drop on companion receiver 33 and is had influence on the second television channel output signal (S-out2), so slave TV will be dialled the second television channel output signal (S-out2) of emitting video signal bad.
Continue, consult once again Fig. 2, for fear of this locality of main receiver 32, leak 3220 sensitivity while interfering with slave television reception the second television channel output signal (S-out2), the present invention is provided with a main shock in the output of companion receiver 33 and leaks processing unit 40.Main shock leaks processing unit 40 and from companion receiver 33 receptions one, has the second television channel output signal (S-out2) of local leakage 3220, the this locality that utilizes digital processing mode to detect and eliminate to comprise among the second television channel output signal (S-out2) leaks 3220, to provide one not have local the second television channel output signal of leaking noise composition (S-out2 ') to slave TV.At this, via main shock, leak the setting of processing unit 40, can detect, eliminate this locality comprising among the second television channel output signal (S-out2 ') and leak 3220, and to avoid local, leak 3220 sensitivity while interfering with slave television reception the second television channel output signal (S-out2 ') and have influence on the video signal quality of dialling while putting the second television channel output signal (S-out2 ').
It is to select to take different digital processing modes to leak 3220 to detect, to eliminate this locality being comprised among the second television channel output signal (S-out2) that main shock of the present invention leaks processing unit 40, and its digital processing mode that can take is as described below:
Refer to Fig. 4, for main shock of the present invention leaks the structural representation of the first embodiment of processing unit.The present embodiment main shock leaks processing unit 40 and comprises a fast Flourier calculating operation average unit 41 and a filter unit 42, and filter unit 42 connects fast Flourier calculating operation average unit 41.
Fast Flourier calculating operation average unit 41 receives one from companion receiver 33 and includes local the second television channel output signal (S-out2) of leaking (LO-lk), the fourier transform program of carrying out is converted to frequency domain this is included to local the second television channel output signal (S-out2) of leaking (LO-lk) from time domain, afterwards, then the calculating operation average program of the carrying out this locality only obtain single-frequency so that periodic the second television channel output signal (S-out2) calculating operation average is offset leak (LO-lk).
Refer to Fig. 5, for main shock of the present invention leaks the structural representation of the second embodiment of processing unit.The present embodiment main shock leaks processing unit 40 and comprises a demodulating unit 43, a comparing unit 44 and an adder 45, and comparing unit 44 is arranged on 45 of demodulating unit 43 and adders.
Comparing unit 44 is set with a sample signal, and this sample signal is one not have the local idealized waveform signal that leaks noise, and it can not be subject to locally leaking second television channel output signal (S-out2) institute's demodulation of disturbing and going out by one.Comparing unit 44 compares restituted signal and Utopian sample signal, and to produce a difference signal, this difference signal also can be the local signal audio frequency (signal tone) that leaks (LO-lk).
Refer to Fig. 6, for main shock of the present invention leaks the structural representation of the 3rd embodiment of processing unit.The present embodiment main shock leaks processing unit 40 and comprises a frequency sweep unit 46 and a filter unit 47, and filter unit 47 connects frequency sweep unit 46.
The present embodiment main shock leaks processing unit 40 and is set with an audio-frequency test signal (tone test signal), and this audio-frequency test signal can be referred to first and shakes source 322 to be set relatively.Frequency sweep unit 46 receives this from companion receiver 33 and includes local the second television channel output signal (S-out2) of leaking (LO-lk), utilize audio-frequency test signal frequency sweep the second television channel output signal (S-out2), with frequency sweep from the second television channel output signal (S-out2), go out a this locality that is compatible with audio-frequency test signal and leak (LO-lk).
The frequency information of (LO-lk) is leaked in this locality that filter unit 47 goes out according to frequency sweep, with the signal that will be in the second television channel output signal (S-out2) leaks (LO-lk) frequency corresponding to this locality, eliminate, and obtain one, not there is local the second television channel output signal of leaking noise (S-out2 ').
From the above, main shock of the present invention leaks this locality that processing unit 40 utilizes different digital processing modes to detect, eliminate the main receiver 32 comprising among the second television channel output signal (S-out2 ') and leaks 3220, to avoid local 3220 sensitivity while interfering with slave television reception the second television channel output signal (S-out2 ') of leaking.Certainly, above-mentioned three kinds of digital processing modes are only the part specific embodiments that main shock of the present invention leaks processing unit 40, know this skill person and should understand the digital processing mode that main shock of the present invention leaks processing unit 40 and be not limited to this.
Referring to Fig. 7, is the flow chart of a preferred embodiment of digital television signal receiving method of the present invention.Consult in shown in Fig. 2, first, execution step S501, during digital TV receiving system 300 running of the present invention, the digital television channel input signal (S-in) that chip 30 can receive after at least one frequency reducing via antenna 21 and low noise amplifier 22.
Execution step S502, chip 30 utilizes low assorted amplifier 31 to amplify television channel input signal (S-in).Then, execution step S511, the television channel input signal (S-in) after amplification is sent to main receiver 32, or, execution step S521, the television channel input signal (S-in) after amplification is sent to companion receiver 33.
When the television channel input signal (S-in) after amplifying is sent to main receiver 32, execution step S512, main receiver 32 utilizes the first frequency mixer 321 mixing television channel input signals (S-in) and concussion source 322, first ground, to produce one first television channel output signal (S-out1)., main frame TV can be put the video signal content that the first television channel output signal (S-out1) watches television channel program by dialling.
Or, when the television channel input signal (S-in) after amplifying is sent to companion receiver 33, execution step S522, companion receiver 33 utilizes the second frequency mixer 331 mixing television channel input signals (S-in) and the second local concussion source 332, to produce one second television channel output signal (S-out2) and to be sent to main shock, leaks processing unit 40.
Then, execution step S523, main shock leaks processing unit 40 selects this locality of taking different digital processing mode to detect, eliminate the main receiver 32 comprising among the second television channel output signal (S-out2) to leak 3220, and the process step of its various digital processing modes is as described below respectively:
Consult in shown in Fig. 4, the process step of the first digital processing mode is: fast Flourier calculating operation average unit 41 is carried out a fourier transform program and from time domain, is converted to frequency domain this is included to the second television channel output signal (S-out2) of (LO-lk), afterwards, then the calculating operation average program of carrying out so that the second television channel output signal (S-out2) calculating operation average is offset and only to be obtained local leakage (LO-lk); Then, filter unit 41 is dependent on local frequency information of leaking (LO-lk), with the signal that will be in the second television channel output signal (S-out2) leaks (LO-lk) frequency corresponding to this locality, eliminate, and can obtain one and not there is local the second television channel output signal of leaking noise (S-out2 ').
Separately, consult in shown in Fig. 5, the process step of the second digital processing mode is: this second television channel output signal (S-out2) that includes local leakage (LO-lk) of demodulating unit 43 demodulation has the local restituted signal that leaks composition to produce one; Afterwards, comparing unit 44 compares restituted signal and Utopian sample signal, to produce a difference signal; Then, adder 45 includes local the second television channel output signal (S-out2) of leaking (LO-lk) by this and deducts difference signal, can obtain one and not have local the second television channel output signal of leaking noise (S-out2 ').
Again, consult in shown in Fig. 6, the process step of the third digital processing mode is: frequency sweep unit 46 utilizes an audio-frequency test signal frequency sweep second television channel output signal (S-out2), goes out a this locality that is compatible with audio-frequency test signal leak (LO-lk) with frequency sweep from the second television channel output signal (S-out2); Then, the frequency information of (LO-lk) is leaked in this locality that filter unit 47 goes out according to frequency sweep, with the signal that will be in the second television channel output signal (S-out2) leaks (LO-lk) frequency corresponding to this locality, eliminate, and obtain one, not there is local the second television channel output signal of leaking noise (S-out2 ').
After above-mentioned digital processing program, slave TV can receive one and not have local the second television channel output signal of leaking noise composition (S-out2 '), and put the second television channel output signal (S-out2 ') to watch the video signal content of television channel program by dialling.
As described above, it is only a preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations of doing according to the shape described in the present patent application the scope of the claims, structure, feature and spirit change and modify, and all should be included in claim of the present invention.
Claims (10)
1. a digital television signal receiving method, it is characterized in that, be applied on a digital television signal receiving system, digital television signal receiving system comprises that one has the chip of a low noise amplifier and a main receiver, at least one companion receiver and at least one main shock leakage processing unit, and method step comprises:
Make chip receive the television channel input signal of at least one numeral;
Utilize low noise amplifier to amplify television channel input signal;
Television channel input signal after transmission is amplified is to main receiver and companion receiver;
Utilize main receiver mixing television channel input signal and a first and shake source to produce one first television channel output signal;
Utilize companion receiver mixing television channel input signal and one second local concussion source to produce one second television channel output signal; And
Make main shock leak and process the main shock leakage that unit by using one digital processing mode detected, eliminated the main receiver comprising among the second television channel output signal.
2. digital television signal receiving method as claimed in claim 1, is characterized in that, the step of this digital processing mode comprises:
The fourier transform program of carrying out is converted to frequency domain this is included to the second television channel output signal of this this locality leakage from time domain;
The calculating operation average program of carrying out only obtains this this locality leakage so that this second television channel output signal calculating operation average is offset; And
Be pursuant to the frequency information of leaking this this locality and carry out a filter so that this this locality is leaked and to be eliminated for this second television channel output signal among this second television channel output signal.
3. digital television signal receiving method as claimed in claim 1, is characterized in that, the step of this digital processing mode comprises:
This second television channel output signal that includes this this locality leakage of demodulation is to produce a restituted signal;
Relatively this restituted signal and a sample signal are to produce a difference signal; And
Make this television channel input signal deduct this difference signal so that this this locality leakage is eliminated among this second television channel output signal.
4. digital television signal receiving method as claimed in claim 1, is characterized in that, the step of this digital processing mode comprises:
Set an audio-frequency test signal;
This main shock that utilizes this second television channel output signal of this audio-frequency test signal frequency sweep to be compatible with this audio-frequency test signal to obtain leaks; And
Be pursuant to the frequency information of leaking this this locality and carry out a filter so that this this locality is leaked and to be eliminated for this second television channel output signal among this second television channel output signal.
5. a digital television signal receiving system, is characterized in that, comprising:
One chip, in order to receive the television channel input signal of at least one numeral, comprising:
One low noise amplifier, in order to amplify television channel input signal; And
One main receiver, the output of connection low noise amplifier, utilizes one first frequency mixer mixing television channel input signal and a first and shakes source to produce one first television channel output signal;
At least one companion receiver, the output of the low noise amplifier of connection chip, utilizes one second frequency mixer mixing television channel input signal and one second local concussion source to produce one second television channel output signal; And
At least one main shock leaks processing unit, and auxiliary connection receiver leaks in order to detect, to eliminate the main shock of the main receiver comprising among the second television channel output signal.
6. digital television signal receiving system as claimed in claim 5, is characterized in that, this main shock leaks processing unit and comprises:
One fast Flourier calculating operation average unit, from this companion receiver, receive this and include the second television channel output signal that leak this this locality, the fourier transform program of carrying out is converted to frequency domain this is included to the second television channel output signal of this this locality leakage from time domain, then the calculating operation average program of carrying out only obtains this this locality leakage so that this second television channel output signal calculating operation average is offset; And
One filter unit, connect this fast Flourier calculating operation average unit and this companion receiver, via this companion receiver, receive this and include the second television channel input signal leaking this this locality and obtain this this locality leakage via this fast Flourier calculating operation average unit, be pursuant to the frequency information of leaking this this locality and carry out a filter so that this this locality is leaked and to be eliminated for this second television channel output signal among this second television channel output signal.
7. digital television signal receiving system as claimed in claim 5, is characterized in that, this main shock leaks processing unit and comprises:
One demodulating unit, receives this via this companion receiver and includes the second television channel output signal that leak this this locality, and this second television channel output signal that includes this this locality leakage of demodulation is to produce a restituted signal;
One comparing unit, connects this demodulating unit, is set with a sample signal, and relatively this restituted signal and this sample signal are to produce a difference signal; And
One adder, connect this comparing unit and this companion receiver, via this companion receiver, receive this and include the second television channel output signal of leaking this this locality and obtain this difference signal via this comparing unit, the second television channel output signal that this is included to this this locality leakage deducts difference signal so that this this locality leakage is eliminated among this second television channel output signal.
8. digital television signal receiving system as claimed in claim 5, is characterized in that, this main shock leaks processing unit and comprises:
One frequency sweep unit, via this companion receiver, receive this and include the second television channel output signal that leak this this locality, set an audio-frequency test signal, leak this this locality that utilizes this second television channel output signal of this audio-frequency test signal frequency sweep to go out to be compatible with audio-frequency test signal with frequency sweep from this second television channel output signal; And
One filter unit, connect this frequency sweep unit and this companion receiver, via this companion receiver, receive this and include the second television channel output signal of leaking this this locality and obtain this this locality leakage via this frequency sweep unit, be pursuant to the frequency information of leaking this this locality and carry out a filter so that this this locality is leaked and to be eliminated for this second television channel output signal among this second television channel output signal.
9. digital television signal receiving system as claimed in claim 5, is characterized in that, this main shock of this main receiver leaks and leaks to this low noise amplifier and this companion receiver from this main receiver.
10. digital television signal receiving system as claimed in claim 5, is characterized in that, this digital television channel input signal is the signal that accords with DVB-S, ATSC, ISDB-S or other digital television broadcasting standard criterions.
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Citations (9)
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| US20080224770A1 (en) * | 2007-03-13 | 2008-09-18 | 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 |
| US8145162B2 (en) * | 2008-10-31 | 2012-03-27 | Sony Corporation | Tuner device |
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|---|---|---|---|---|
| JPH07274083A (en) * | 1994-03-31 | 1995-10-20 | Matsushita Electric Ind Co Ltd | Double super tuner |
| CN1278137A (en) * | 1999-06-22 | 2000-12-27 | 阿尔卑斯电气株式会社 | Modulation assembly for digital TV set |
| US20020163391A1 (en) * | 2001-03-01 | 2002-11-07 | Peterzell Paul E. | Local oscillator leakage control in direct conversion processes |
| CN1860691A (en) * | 2003-07-30 | 2006-11-08 | 马克西姆综合产品公司 | Broadband single conversion tuner integrated circuits |
| CN1722721A (en) * | 2004-07-09 | 2006-01-18 | Sst通信公司 | LO leakage and sideband image calibration system and method |
| JP2007124290A (en) * | 2005-10-28 | 2007-05-17 | Alps Electric Co Ltd | Dual type digital television tuner |
| US20080224770A1 (en) * | 2007-03-13 | 2008-09-18 | Qualcomm Incorporated | Active circuits with isolation switches |
| US8145162B2 (en) * | 2008-10-31 | 2012-03-27 | Sony Corporation | Tuner device |
| 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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| CN103763600B (en) | 2017-06-20 |
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