CN101779450A - Tuner - Google Patents
Tuner Download PDFInfo
- Publication number
- CN101779450A CN101779450A CN200880102472A CN200880102472A CN101779450A CN 101779450 A CN101779450 A CN 101779450A CN 200880102472 A CN200880102472 A CN 200880102472A CN 200880102472 A CN200880102472 A CN 200880102472A CN 101779450 A CN101779450 A CN 101779450A
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- CN
- China
- Prior art keywords
- mentioned
- signal
- wave band
- band
- vhf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
- H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
-
- 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
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Noise Elimination (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
A tuner comprises: a level attenuator attenuating a signal of a band lower than a first band; a first input tuning unit receiving a signal outputted from the level attenuator to tune a signal of the first band; and a second input tuning unit receiving and tuning a signal of a second band lower than the first band.
Description
Technical field
Execution mode relates to tuner.
Background technology
Tuner is a kind of device of selecting and receive required broadcasting channel from the high-frequency signal that receives by antenna.Tuner can have very high frequency(VHF) (VHF) wave band and the shf band from the hundreds of megahertz to tens gigahertz (GHZ)s from tens megahertzes to the hundreds of megahertz.
Tuner is divided into very high frequency(VHF) tuned cell that receives the very high frequency band channel and the hyperfrequency tuned cell that receives the shf band channel.The channel that receives from the very high frequency(VHF) tuned cell is divided into VHF-L wave band channel and VHF-H wave band channel.
When the signal that receives by tuner passes through active device (for example field effect transistor (FET), integrated circuit (IC) etc.), can produce interference between the signal.As a result, produced received signal with frequency component and difference frequency component, influence channel selection.
Summary of the invention
Technical problem
The tuner that execution mode provides can reduce the interference that produces between signal and improve the selection of channel.
Technical scheme
In one embodiment, a kind of tuner comprises: the level attenuator that makes the signal attenuation of the wave band that is lower than first wave band; Reception from the signal of above-mentioned level attenuator output with the first input tuned cell to the signal tuning of above-mentioned first wave band; And receive the signal of second wave band be lower than above-mentioned first wave band and to the second input tuned cell of the signal tuning of second wave band that is lower than above-mentioned first wave band.
In another embodiment, a kind of tuner comprises: receive the signal of a plurality of wave bands and make predetermined band or the high pass filter that passes through of the signal of high band more; Reception is from the signal of above-mentioned high pass filter output and remove the intermediate frequency filtering unit of intermediate-freuqncy signal; Make the level attenuator of the signal attenuation of the wave band that is lower than first wave band in the signal of above-mentioned intermediate frequency filtering unit output; Reception from the signal of above-mentioned level attenuator output with the first input tuned cell to the signal tuning of above-mentioned first wave band; And receive the signal of second wave band from the signal of above-mentioned intermediate frequency filtering unit output and to the second input tuned cell of the signal tuning of second wave band from the signal of above-mentioned intermediate frequency filtering unit output.
Beneficial effect
Tuner according to execution mode can reduce the selection that the interference that produces between signal also can improve channel.
Description of drawings
Fig. 1 is the view according to a kind of tuner of execution mode.
Fig. 2 is the oscillogram from the frequency signal of the VHF-H input tuned cell output of Fig. 1.
Fig. 3 and Fig. 4 are the view of diagram according to a kind of channel selection characteristic of tuner of execution mode.
Embodiment
Hereinafter, will be with reference to a plurality of execution modes of described description of drawings.
Fig. 1 is the view according to a kind of tuner of execution mode, and Fig. 2 is an oscillogram of importing the frequency signal of tuned cell output from the VHF-H of Fig. 1.
11 pairs of signal filterings that receive from antenna ANT of high pass filter (HPF) are with the output high-frequency signal.For example, the signal from above-mentioned high pass filter 11 outputs may receive from above-mentioned antenna ANT, the signal from about 40 megahertzes to the wave band of about 950 megahertzes.
Intermediate frequency filtering unit 13 is from removing intermediate-freuqncy signal through the high-frequency signal of above-mentioned high pass filter 11 filtering.Above-mentioned intermediate frequency filtering unit 13 can comprise capacitor and inductor.For example, in above-mentioned intermediate frequency filtering unit 13, inductor L21 and capacitor C21 can be parallel with one another.
Hyperfrequency input tuned cell 15 receives the shf band frequency signal from the high-frequency signal of having removed intermediate-freuqncy signal by above-mentioned intermediate frequency filtering unit 13, and tuning to this shf band frequency signal.For example, switching diode D21 is opened by hyperfrequency selector switch (UHF-SW) signal, and above-mentioned hyperfrequency input tuned cell 15 receives above-mentioned hyperfrequency waves segment signals and to above-mentioned shf band signal tuning.For example, above-mentioned hyperfrequency input tuned cell 15 can be to the shf band signal tuning from about 470 megahertzes to 850 megahertzes.
VHF-H input tuned cell 19 receives the VHF-H band signal from the high-frequency signal of having removed intermediate-freuqncy signal by described intermediate frequency filtering unit 13, and tuning to this VHF-H band signal.For example, switching diode D is opened by VHF-H selector switch (VHF-H SW) signal.Therefore, 19 pairs of VHF-H band signal from about 170 megahertzes to about 470 megahertzes of above-mentioned VHF-H input tuned cell are tuning, and this VHF-H band signal receives via level attenuator 17, inductor L22 and L23 and variable capacitance diode D22.
Above-mentioned level attenuator 17 can reduce the signal level of the 13 VHF-H band signal medium and low frequency wave bands that receive from above-mentioned intermediate frequency filtering unit.For example, above-mentioned level attenuator 17 can reduce the signal level from about 50 megahertzes to the wave band of about 170 megahertzes.Above-mentioned level attenuator 17 can comprise capacitor and inductor.
For example,, comprise that the high pass filter of capacitor C and inductor L can be used as above-mentioned level attenuator 17, be used for only by having the high frequency band signal of predetermined band scope as illustrating among Fig. 1.Above-mentioned capacitor C can be connected between above-mentioned intermediate frequency filtering unit 13 and the above-mentioned VHF-H input tuned cell 19.Above-mentioned inductor L has an end to be connected between above-mentioned capacitor C and the above-mentioned VHF-H input tuned cell 19, and other end ground connection.
VHF-L input tuned cell 21 receives the VHF-L band signal from the high-frequency signal of having removed intermediate-freuqncy signal by described intermediate frequency filtering unit 13, and tuning to this VHF-H band signal.For example, 21 pairs of above-mentioned VHF-L input tuned cells are tuning via inductor L24 and L25 and variable capacitance diode D23 VHF-L band signal that receive, from about 50 megahertzes to about 170 megahertzes.
Described tuner according to a kind of execution mode uses above-mentioned high pass filter 11 to remove the low-frequency band signal from the signal that receives by above-mentioned antenna ANT.Described tuner will be transferred to above-mentioned hyperfrequency input tuned cell 15, above-mentioned VHF-H input tuned cell 19 and above-mentioned VHF-L input tuned cell 21 by the signal that intermediate-freuqncy signal has been removed in above-mentioned intermediate frequency filtering unit 13.Therefore, above-mentioned hyperfrequency input tuned cell 15, above-mentioned VHF-H input tuned cell 19 and 21 pairs of high-frequency signals that receive of above-mentioned VHF-L input tuned cell are tuning, to select the channel of required frequency band.
If selected VHF-H wave band channel, above-mentioned diode D is electrically connected by the voltage that provides from above-mentioned VHF-H selector switch (VHF-H SW).The high-frequency signal of 13 outputs is by above-mentioned level attenuator 17 and be transferred to above-mentioned VHF-H input tuned cell 19 from above-mentioned high pass filter 11 and above-mentioned intermediate frequency filtering unit.The high pass filter that comprises capacitor C and inductor L can be used as above-mentioned level attenuator 17.Above-mentioned level attenuator 17 makes the predetermined VHF-H wave band or the signal level attenuation of the frequency of low band more, and make predetermined VHF-H wave band or more the frequency signal of high band pass through.
In the described tuner according to a kind of execution mode, identified as the character B of Fig. 2, when selecting VHF-H wave band channel, in selected VHF-H wave band, above-mentioned level attenuator 17 has obviously reduced the signal level from about 50 megahertzes to the frequency band of about 170 megahertzes.Therefore, when above-mentioned VHF-H input tuned cell 19 was selected above-mentioned VHF-H wave band channel, the interference that is produced by the signal from about 50 megahertzes to the wave band of about 170 megahertzes can reduce significantly.
In the described tuner according to a kind of execution mode,, just can detect the waveform that the character A as Fig. 2 is identified if do not use above-mentioned level attenuator 17.That is to say that if do not use above-mentioned level attenuator 17, then the signal level from about 50 megahertzes to the wave band of about 170 megahertzes is greater than detected signal level when the application level attenuator 17.
If receiving channels frequency F1 and channel frequency F2 in VHF-L wave band (from about 50 megahertzes to about 170 megahertzes) scope, and in VHF-H wave band (from about 170 megahertzes to about 470 megahertzes) scope receiving channels frequency F3.So, the interference signal frequency F4 that generates from above-mentioned channel frequency F1 and above-mentioned channel frequency F2 sum is positioned near the above-mentioned channel frequency F3.
In the time of near above-mentioned interference signal frequency F4 is positioned at above-mentioned channel frequency F3, above-mentioned interference signal frequency F4 is influential to the channel selection of above-mentioned channel frequency F3.This will illustrate with reference to figure 3 and Fig. 4.Fig. 3 is the signal interference figure during the application level attenuator not, the signal interference figure when Fig. 4 is the application level attenuator.
With reference to figure 3 and Fig. 4, according to the application of above-mentioned level attenuator 17 whether, the signal level of the signal level of above-mentioned channel frequency F1 and above-mentioned channel frequency F2 changes.When using above-mentioned level attenuator 17, reduced the signal level of above-mentioned channel frequency F1 and the signal level of above-mentioned channel frequency F2, thereby further reduced the signal level of above-mentioned interference signal frequency F4.
Because the signal level of above-mentioned interference signal frequency F4 is very big when not using above-mentioned level attenuator 17, so above-mentioned interference signal frequency F4 is influential to the channel selection of above-mentioned channel frequency F3.Yet when using above-mentioned level attenuator 17, the signal level of above-mentioned interference signal frequency F4 is very little, and this can prevent that above-mentioned interference signal frequency F4 from exerting an influence to the channel selection of above-mentioned channel frequency F3.
For example, above-mentioned channel frequency F1 can be 55.25 megahertzes, and above-mentioned channel frequency F2 can be 157.25 megahertzes, and above-mentioned channel frequency F3 can be 210.25 megahertzes.Above-mentioned interference signal frequency F4 generates from above-mentioned channel frequency F1 and above-mentioned channel frequency F2 sum, can be 212.5 megahertzes.
In the described tuner according to a kind of execution mode, when the channel of 210.25 megahertzes of selecting above-mentioned VHF-H wave band, above-mentioned VHF-H input tuned cell 19 can be tuned to be equivalent to the signal of the signal that the character B as Fig. 2 identified, to select the channel of this 210.25 megahertz.Therefore, because weaken and received the signal of above-mentioned 55.25 megahertzes and the signal of above-mentioned 157.25 megahertzes, so the interference signal of above-mentioned 212.5 megahertzes can reduce.According to a kind of execution mode, the signal level of above-mentioned interference signal can reduce, thereby improves the selection to the channel of above-mentioned 210.25 megahertzes.
When whenever mentioning " a kind of execution mode ", " execution mode ", " execution mode for example " etc. in this specification, mean in conjunction with the described special characteristic of this execution mode, structure or characteristic to be included at least a execution mode of the present invention.This type of phrase that occurs in the different places of this specification differs to establish a capital and refers to same execution mode.And, when describing special characteristic, structure or characteristic, will be understood that it is within those skilled in the art's the visual field that this category feature, structure or characteristic are implemented in conjunction with other execution mode in conjunction with arbitrary execution mode.
Although described a plurality of execution modes with reference to a large amount of illustrative embodiments at this,, it will be appreciated that those skilled in the art also can design a large amount of other modification and the execution modes in the spirit and scope that drop on principle of the present disclosure.More specifically, in the scope of the disclosure, accompanying drawing and claims, in the part and/or scheme of subject combination scheme, variations and modifications can be arranged.To those skilled in the art, except the variation in part and/or scheme and revising, other purposes also is obvious.
Industrial applicibility
Tuner according to described embodiment can reduce the interference that produces between signal, and improves the selection of channel.
Claims (14)
1. tuner comprises:
Make the level attenuator of the signal attenuation of the wave band that is lower than first wave band;
Reception from the signal of above-mentioned level attenuator output with the first input tuned cell to the signal tuning of above-mentioned first wave band; And
Reception be lower than above-mentioned first wave band second wave band signal and to the second input tuned cell of the signal tuning of described second wave band.
2. tuner according to claim 1 comprises the signal of the triband that reception is higher than above-mentioned first wave band and to the 3rd input tuned cell of the signal tuning of described triband.
3. tuner according to claim 1, wherein, above-mentioned level attenuator makes the signal attenuation by the tuning wave band of the above-mentioned second input tuned cell.
4. tuner according to claim 1, wherein, above-mentioned level attenuator comprises high pass filter.
5. tuner according to claim 1, wherein, above-mentioned level attenuator comprises capacitor and inductor.
6. tuner according to claim 5, wherein, above-mentioned capacitor is connected to the above-mentioned first input tuned cell in the mode of series connection, and above-mentioned inductor has an end to be connected between above-mentioned capacitor and the above-mentioned first input tuned cell and other end ground connection.
7. tuner according to claim 1 comprises:
Antenna;
Reception is from the signal of above-mentioned antenna output and make predetermined band or the high pass filter that passes through of the signal of high band more; And
Reception is from the signal of above-mentioned high pass filter output and remove intermediate-freuqncy signal, is transferred to the intermediate frequency filtering unit of above-mentioned level attenuator with the signal that will remove intermediate-freuqncy signal.
8. tuner according to claim 7, wherein, the signal of exporting from above-mentioned intermediate frequency filtering unit is transferred to the above-mentioned second input tuned cell.
9. tuner according to claim 2, wherein, above-mentioned first wave band is very high frequency(VHF) (VHF)-H band, above-mentioned second wave band is very high frequency(VHF) (VHF)-L-band, and above-mentioned triband is hyperfrequency (UHF) wave band.
10. tuner comprises:
Receive the signal of a plurality of wave bands and make predetermined band or the high pass filter that passes through of the signal of high band more;
Reception is from the signal of above-mentioned high pass filter output and remove the intermediate frequency filtering unit of intermediate-freuqncy signal;
Make the level attenuator of the signal attenuation of the wave band that is lower than first wave band from the signal of above-mentioned intermediate frequency filtering unit output;
Reception from the signal of above-mentioned level attenuator output with the first input tuned cell to the signal tuning of above-mentioned first wave band; And
The signal of second wave band of reception from the signal of above-mentioned intermediate frequency filtering unit output and to the second input tuned cell of the signal tuning of second wave band from the signal of above-mentioned intermediate frequency filtering unit output.
11. tuner according to claim 10 comprises the signal of the triband of reception from the signal of above-mentioned intermediate frequency filtering unit output and to the 3rd input tuned cell of the signal tuning of the triband from the signal of above-mentioned intermediate frequency filtering unit output.
12. tuner according to claim 10, wherein, above-mentioned level attenuator comprises high pass filter.
13. tuner according to claim 10, wherein, above-mentioned level attenuator comprises capacitor and inductor.
14. tuner according to claim 11, wherein, above-mentioned first wave band is very high frequency(VHF) (VHF)-H band, and above-mentioned second wave band is very high frequency(VHF) (VHF)-L-band, and above-mentioned triband is hyperfrequency (UHF) wave band.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2007-0067501 | 2007-07-05 | ||
| KR1020070067501A KR20090003013A (en) | 2007-07-05 | 2007-07-05 | Input resonance circuit of tuner |
| PCT/KR2008/003616 WO2009005241A1 (en) | 2007-07-05 | 2008-06-25 | Tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101779450A true CN101779450A (en) | 2010-07-14 |
Family
ID=40226236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880102472A Pending CN101779450A (en) | 2007-07-05 | 2008-06-25 | Tuner |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20090003013A (en) |
| CN (1) | CN101779450A (en) |
| TW (1) | TW200908726A (en) |
| WO (1) | WO2009005241A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9710606B2 (en) | 2014-10-21 | 2017-07-18 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for neurological health issues |
| US10357157B2 (en) | 2014-10-21 | 2019-07-23 | uBiome, Inc. | Method and system for microbiome-derived characterization, diagnostics and therapeutics for conditions associated with functional features |
| US10410749B2 (en) | 2014-10-21 | 2019-09-10 | uBiome, Inc. | Method and system for microbiome-derived characterization, diagnostics and therapeutics for cutaneous conditions |
| US10265009B2 (en) | 2014-10-21 | 2019-04-23 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for conditions associated with microbiome taxonomic features |
| US9754080B2 (en) | 2014-10-21 | 2017-09-05 | uBiome, Inc. | Method and system for microbiome-derived characterization, diagnostics and therapeutics for cardiovascular disease conditions |
| US10777320B2 (en) | 2014-10-21 | 2020-09-15 | Psomagen, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for mental health associated conditions |
| US10409955B2 (en) | 2014-10-21 | 2019-09-10 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for locomotor system conditions |
| US9760676B2 (en) | 2014-10-21 | 2017-09-12 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for endocrine system conditions |
| US10789334B2 (en) | 2014-10-21 | 2020-09-29 | Psomagen, Inc. | Method and system for microbial pharmacogenomics |
| US10381112B2 (en) | 2014-10-21 | 2019-08-13 | uBiome, Inc. | Method and system for characterizing allergy-related conditions associated with microorganisms |
| WO2016065075A1 (en) | 2014-10-21 | 2016-04-28 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics |
| US9758839B2 (en) | 2014-10-21 | 2017-09-12 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for conditions associated with microbiome functional features |
| US10073952B2 (en) | 2014-10-21 | 2018-09-11 | uBiome, Inc. | Method and system for microbiome-derived diagnostics and therapeutics for autoimmune system conditions |
| US10366793B2 (en) | 2014-10-21 | 2019-07-30 | uBiome, Inc. | Method and system for characterizing microorganism-related conditions |
| US10388407B2 (en) | 2014-10-21 | 2019-08-20 | uBiome, Inc. | Method and system for characterizing a headache-related condition |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3631037B2 (en) * | 1999-03-18 | 2005-03-23 | アルプス電気株式会社 | Television tuner |
| JP3490023B2 (en) * | 1999-04-20 | 2004-01-26 | アルプス電気株式会社 | TV signal receiving tuner |
| JP3828745B2 (en) * | 2000-12-14 | 2006-10-04 | アルプス電気株式会社 | Television tuner |
-
2007
- 2007-07-05 KR KR1020070067501A patent/KR20090003013A/en not_active Application Discontinuation
-
2008
- 2008-06-25 CN CN200880102472A patent/CN101779450A/en active Pending
- 2008-06-25 WO PCT/KR2008/003616 patent/WO2009005241A1/en active Application Filing
- 2008-07-04 TW TW097125283A patent/TW200908726A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TW200908726A (en) | 2009-02-16 |
| KR20090003013A (en) | 2009-01-09 |
| WO2009005241A1 (en) | 2009-01-08 |
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Application publication date: 20100714 |