CN1340242A - Speed up search tuning in television receivers - Google Patents
Speed up search tuning in television receivers Download PDFInfo
- Publication number
- CN1340242A CN1340242A CN00803790A CN00803790A CN1340242A CN 1340242 A CN1340242 A CN 1340242A CN 00803790 A CN00803790 A CN 00803790A CN 00803790 A CN00803790 A CN 00803790A CN 1340242 A CN1340242 A CN 1340242A
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- CN
- China
- Prior art keywords
- channel
- signal
- band
- digital
- sub
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
A method of performing a search tuning of television signals in a television band containing both analog and digital television signals. First, an analog channel search is performed to determined all of the analog channels receivable in the television band. Then, a digital channel search is performed in which the analog channels determined in the analog channel search are skipped. Since a digital channel search necessarily uses significantly smaller frequency steps than in the analog channel search, a considerable amount of time is saved by not searching the already determined analog channels.
Description
Background of invention
Invention field
Theme of the present invention relates to the television receiver that is connected to the wire user net tuning, particularly is called as the tuning process of ＂ search tuning ＂.
Description of the Prior Art
Outside indivedual exceptions, the television receiver that is used for existing anolog TV signals can automatically scan the interior source signal of available channel frequency domain, and these convenient channels that use are stored in the memory that calls later.Though there are various frequency allocation plans for cable television network, actual conditions are that any frequency place can find exception and the deviation call volume (the amount of exceptionsand deviations call) that is used for searching algorithm in band.Search for all television reception frequency bands and need reasonably finish (usually within 1 minute) in order to avoid user's worry in the time quantum.Take big frequency step scan band to realize tuning fast at every turn.This is possible, because the demodulator that the traditional analog television system uses has bigger off resonance scope; 1000kHz for example.Even tuning inaccuracy, demodulator also can locking signal with provide relevant frequency error to feed back to the main frame microcontroller, then can the fine tuning tuner be tuned to accurately on the frequency.
DE19728 765 A1 disclose a kind of method, this method by sequentially export tuning data and when input during from the signal of automatic channel setting by export this tuning data store the channel with wireless television signal have cable TV signal television channel the automatic channel storage and select.
Typical search tuning system is by following operation.System at first determines whether be last channel.If system withdraws from this program so.If not, next channel is selected by system so.Channel is stored in the television receiver together with the channel nominal frequency.As Figure 1A, each channel has the bandwidth of 6MHz.In order to search for the TV signal of reception, system is with for example 1000kHz sub-band step scan channel bandwidth, and this frequency band originates in the first channel sub-band of the low-limit frequency near the nominal frequency of specific channel the channel bandwidth.Then, next TV signal is attempted to obtain by this system.Subsequently, whether system's decision has obtained next TV signal.If system then stores this channel frequency data so.Store after these channel frequency data, system turns back to the first step so that determine whether this channel is last channel.If also do not obtain final channel number, system determines that whether this channel is the last sub-band step-length in this specific channel bandwidth so.If not, then system selects next channel sub-band step-length to return then so that obtain next TV signal step to attempt to obtain this TV signal.If the final channel sub-band step-length in this specific channel bandwidth that is this, system turns back to and determines that whether this is the first step of final channel number so.
Introducing along with some new digital television transfer signals of wired and air broadcast has occurred can receiving both demands of analog-and digital-TV signal to television receiver.The signal that is applied to this television receiver can comprise traditional analog RF signal now and can be 64/256QAM, the mixing of the Digital Television of 8/16VSB (DTV) RF signal.But the demodulator that is used for the DTV signal requires the oscillator frequency of demodulator within the 50-150kHz scope of the DTV signal that for example receives, so that demodulator locks is to the DTV signal that receives and the feedback information of relevant actual carrier frequency is provided.This requires the step-length quite little step scan frequency band of search tuning to use when (for example 125kHz sees Figure 1B) than the scanning analog television channels, has therefore greatly increased the search tuning time.
Summary of the invention
The needed time quantum of all available television signals that an object of the present invention is search tuning is mixed in the network that transmits analog-and digital-TV signal reduces as far as possible.
For this reason, the invention provides a kind of search tuning that defines in the independent claims.Subordinate has defined advantageous embodiments.
Because the DTV signal is not play in identical channel/frequency with anolog TV signals, so television receiver needn't be searched for whole television frequency frequency band to determine available DTV signal.By at first carrying out anolog TV signals search (this may be very fast), follow the channel frequency position that television receiver may be eliminated determined anolog TV signals.Television receiver only needs to search for/scan and does not simulated the channel frequency position that TV signal occupies then.
Accompanying drawing is described
Consider the following above-mentioned and attached purpose and the advantage that will occur, the present invention will be described with reference to the drawings, wherein:
Figure 1A is the television channel schematic diagram of expression 1000kHz analog channel sub-band step-length, and Figure 1B is the television channel schematic diagram of expression 125kHz digital channel sub-band step-length.With
Fig. 2 is the schematic block diagram that can receive both television receivers of analog-and digital-TV signal;
DETAILED DESCRIPTION OF THE PREFERRED
Fig. 2 represents to receive the schematic block diagram of both television receivers of analog-and digital-TV signal.TV signal is applied on the television receiver through antenna 30.Though antenna 30 is shown, is to be understood that TV signal can additionally provide by cable television system or by standard television antenna and satellite antenna combination or the like.Antenna 30 be connected to tuner 32 be used for be tuned to various TV signal.Analog demodulator 34 is connected to the output of tuner 32 and applies an input that outputs to switch 36.Digital demodulator 38 also is connected to the output of tuner 32, and tuner 32 comprises having for example phase-locked loop of the tuning resolution of 62.5kHz.After D/A converter 40 conversions, the output of digital demodulator 38 is applied to second input of switch 36.Output from switch 36 is applied to the sound signal that audio signal processor 42 is used to produce loud speaker 44 and 46.In addition, the output from switch 36 also is applied to the vision signal that video signal processor 48 is used to produce display 50.
The tuning of tuner 32 controlled by microprocessor 52, the error signal that microprocessor 52 receives from analog-and digital-demodulator 34 and 38.According to just tuning be simulation or digital television signal, the switching position of microcontroller 52 control switchs 36.In addition, microcontroller 52 applies control signals to audio signal processor 42, be used to control playback sound signal audio parameter and be applied to video signal processor 48, be used to control the video parameter of the vision signal of playback.Microcontroller 52 utilizes customer controller 54 by the user or sends alternatively that infrared signal controls to the receiver in the user control.
The tabulation of all television channels and its corresponding nominal carrier frequency are stored in the microcontroller 52.Though there are various allocative decisions, in fact, the actual carrier frequency that is used for specific channel TV signal can near changing within the nominal carrier frequency Anywhere.Therefore, a kind of search tuning of microcontroller 52 execution is necessary with the actual carrier frequency that finds all available television channels.
Can carry out following description to both programs of the analog-and digital-TV signal of above-mentioned television receiver search tuning.When beginning this program, television receiver is carried out an analog channel search.Search can be identical with search shown in Figure 1.As mentioned above, though the frequency step size of analog channel search is arranged on 1000kHz, should be appreciated that this frequency step size is arbitrarily and can be decided to be other and for example be worth in the 750-1250kHz scope.After the analog channel search, television receiver is followed the combine digital channel search, and this program stops afterwards.
Can be by a kind of program of following description television receiver combine digital channel search.Carry out after the analog channel search, whether the current channel of this program decision is to be positioned at final channel.If then this program stops.If not, then television receiver proceeds to next channel and the TV signal of the acquisition in the search of this channel and analog channel is compared.If current channel is corresponding to the analog channel numeral of storage, program turns back to the first step so.If not, procedure stipulation is used for the first channel sub-band step-length of current channel.Then, this television receiver attempts to obtain digital signal.If obtained digital signal, television receiver is stored this digital channel frequency so, turns back to the first step then.If do not obtain digital signal, whether program decision current channel sub-band step-length is last of current channel.If not, then program proceeds to next channel sub-band step-length, and this program turns back to digital signal acquisition step.If the current channel sub-band is last channel in the current channel, this turns back to the first step so.
As mentioned above, digital demodulator 38 has the tuning resolution of 62.5kHz.Therefore, in order to guarantee the proper carrier wave frequency, then the step size of channel sub-band is arranged on 2 times to this tuning resolution, that is to say 125kHz.
In a word, by at first carrying out analog channel search faster, when the combine digital channel search, the analog channel of distribution can be cancelled the digital channel search time of therefore greatly having reduced scanning and searching television frequency band from the digital channel search.
It should be noted that the foregoing description is explanation rather than limits this invention, and will design many alternative embodiments for a person skilled in the art and do not break away from the appended scope of claim.In the claims, the reference symbol that is placed in the bracket is not considered as limiting this claim.Word " comprises " does not get rid of unit or the step situation that is listed in the claim that be different from.Word before the unit " one " or " one " do not get rid of the situation of a plurality of this unit.The present invention can utilize the hardware that comprises some different units and utilize the computer-implemented of programming that match.In enumerating the equipment claim of some devices, these devices of part can be implemented by the hardware of same content.In different dependent claims, quote the pure fact of some measurements mutually and do not represent that these measurement combinations can not advantageously be used.
Claims (10)
1. in the television receiver of analog and digital signal, be used for a kind of method of search tuning, may further comprise the steps:
Reception comprises an input TV signal of a plurality of analog-and digital-TV signal;
Obtain the allocated channel number of the anolog TV signals of described anolog TV signals in the described input TV signal and described acquisition; With
Obtain the allocated channel number of the digital television signal of all described digital television signals in the described input TV signal and described acquisition, the described step of the described digital television signal of wherein said acquisition comprises step:
Skip the channel frequency position of the anolog TV signals of acquisition, the anolog TV signals of described acquisition are to determine in the described step of described acquisition anolog TV signals.
2. method according to claim 1, the described step that wherein obtains described anolog TV signals comprises following steps:
Determine current channel number whether be last channel and if words stop this program;
Select next channel;
Select the first channel sub-band step-length;
Attempt to obtain the TV signal within the described channel sub-band;
If obtained a TV signal storage of channel frequency data and turning back to whether determine current channel number be the described step of final channel number;
If do not obtain a TV signal, then determine described current channel sub-band step-length whether be within this current channel bandwidth last frequency band sub-band step-length and if words turn back to and determine that whether current channel number is the step of final channel number; With
If current channel sub-band step-length is not a final channel sub-band step-length, then select next channel sub-band step-length to turn back to the step of attempting to obtain a TV signal then.
3. method according to claim 2, wherein said channel sub-band step-length is in the 750-1250kHz frequency range.
4. method according to claim 3, wherein said channel sub-band step-length is 1000kHz.
5. method according to claim 1, the described step that wherein obtains described digital television signal comprises following steps:
Determine current channel number whether be last channel and if words stop this program;
Select next channel;
Relatively current channel number and the analog channel of storing number;
If comparison step result's coupling then turns back to described determining step;
Select the first digital channel sub-band;
Attempt to obtain the TV signal within the described digital channel sub-band;
If obtained TV signal storage of channel frequency data and turning back to whether determine current channel number be the described step of final channel number;
If do not obtain a TV signal, then determine described current digital channel sub-band whether be within this current channel bandwidth last digital channel sub-band and if turn back to and determine that whether current channel number is the step of final channel number; With
If current digital channel sub-band is not last digital channel sub-band, then select next digital channel sub-band to turn back to the step of attempting to obtain a TV signal then.
6. method according to claim 5, the tuning resolution of 2 times of digital demodulators in television receiver of wherein said digital channel sub-band step size.
7. method according to claim 6, wherein said step size is 125kHz.
8. method according to claim 2, wherein said digital channel search comprises following steps:
Determine current channel number whether be last channel and if words stop this program;
Select next channel;
Relatively current channel number and the analog channel of storing number;
If comparison step result's coupling then turns back to described determining step;
Select the first digital channel sub-band;
Attempt to obtain the TV signal within the described digital channel sub-band;
If obtained TV signal storage of channel frequency data and turning back to whether determine current channel number be the described step of final channel number;
If do not obtain a TV signal, then determine described current digital channel sub-band whether be within this current channel bandwidth last digital channel sub-band and if words turn back to and determine that whether current channel number is the step of final channel number; With
If current digital channel sub-band is not the final channel sub-band, then select next digital channel sub-band to turn back to the step of attempting to obtain a TV signal then.
9. in the television receiver of analog and digital signal, be used for a kind of equipment of search tuning, comprise:
Be used to receive the device of an input TV signal that comprises a plurality of analog-and digital-TV signal;
Be used for obtaining the device of allocated channel number of the anolog TV signals of all anolog TV signals of described input TV signal and described acquisition;
Be used for obtaining the device of allocated channel number of the digital television signal of all digital television signals of described input TV signal and described acquisition, the wherein said device that is used to obtain digital television signal comprises:
Be used to skip the device of channel frequency position of the anolog TV signals of acquisition, the anolog TV signals of described acquisition are to be determined by the device of described acquisition anolog TV signals.
10. television receiver comprises:
Search tuning equipment as claimed in claim 9;
Be coupled to a kind of video signal processor of described search tuning equipment; With
Be coupled to the display of described video signal processor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46486099A | 1999-12-16 | 1999-12-16 | |
| US09/464,860 | 1999-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1340242A true CN1340242A (en) | 2002-03-13 |
Family
ID=23845542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00803790A Pending CN1340242A (en) | 1999-12-16 | 2000-12-05 | Speed up search tuning in television receivers |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1157461A1 (en) |
| JP (1) | JP2003517235A (en) |
| KR (1) | KR20010102104A (en) |
| CN (1) | CN1340242A (en) |
| WO (1) | WO2001045257A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303811C (en) * | 2004-11-16 | 2007-03-07 | 熊猫电子集团有限公司 | Searching method for TV programme signal |
| CN100348040C (en) * | 2004-05-11 | 2007-11-07 | 乐金电子(中国)研究开发中心有限公司 | Method for manual searching channels in digital TV |
| US7379122B2 (en) | 2003-08-11 | 2008-05-27 | Lg Electronics, Inc. | Digital TV and channel setting method thereof |
| CN1890962B (en) * | 2003-12-22 | 2010-06-16 | 汤姆森特许公司 | Method and apparatus for performing selectable channel search |
| CN101809995B (en) * | 2007-08-08 | 2012-09-05 | 联发科技股份有限公司 | Apparatuses and methods for scanning digital and analog television channels |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100503091B1 (en) * | 2003-07-28 | 2005-07-21 | 삼성전자주식회사 | Method for scanning channel of digital television |
| KR100726105B1 (en) * | 2004-10-11 | 2007-06-12 | 가온미디어 주식회사 | Multi-tuner set top box having integrated channel information management |
| JP4690019B2 (en) * | 2004-11-18 | 2011-06-01 | リーダー電子株式会社 | Channel detection device and tuner inspection device provided with the same |
| JP2007259071A (en) * | 2006-03-23 | 2007-10-04 | Sharp Corp | Broadcast receiver |
| KR100800784B1 (en) | 2006-11-28 | 2008-02-01 | 엘지전자 주식회사 | Method and apparatus for automatic channel search using single tuner |
| TR200703666A2 (en) | 2007-05-28 | 2008-12-22 | Vestel Elektron�K Sanay� Ve T�Caret A.�. | Method for estimating broadcast type for channel setup time minimization. |
| CN101605213A (en) * | 2008-06-13 | 2009-12-16 | 深圳Tcl新技术有限公司 | The coherent system and the method thereof of analog channel and digital channel mapping |
| CN102186040A (en) * | 2011-05-13 | 2011-09-14 | 四川长虹电器股份有限公司 | Quick channel searching method for digital analog television integrated machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE59402086D1 (en) * | 1993-06-03 | 1997-04-17 | Thomson Brandt Gmbh | TELEVISION TUNER FOR TERRESTRIC AND SATELLITE RECEPTION |
| KR100206790B1 (en) * | 1996-07-09 | 1999-07-01 | 구자홍 | Method for tuning and automatic channel memory of television receiver |
| JP3690777B2 (en) * | 1998-08-06 | 2005-08-31 | パイオニア株式会社 | Broadcast receiver |
-
2000
- 2000-12-05 CN CN00803790A patent/CN1340242A/en active Pending
- 2000-12-05 EP EP00981344A patent/EP1157461A1/en not_active Withdrawn
- 2000-12-05 WO PCT/EP2000/012261 patent/WO2001045257A1/en not_active Application Discontinuation
- 2000-12-05 JP JP2001545435A patent/JP2003517235A/en active Pending
- 2000-12-05 KR KR1020017010252A patent/KR20010102104A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7379122B2 (en) | 2003-08-11 | 2008-05-27 | Lg Electronics, Inc. | Digital TV and channel setting method thereof |
| CN1890962B (en) * | 2003-12-22 | 2010-06-16 | 汤姆森特许公司 | Method and apparatus for performing selectable channel search |
| CN100348040C (en) * | 2004-05-11 | 2007-11-07 | 乐金电子(中国)研究开发中心有限公司 | Method for manual searching channels in digital TV |
| CN1303811C (en) * | 2004-11-16 | 2007-03-07 | 熊猫电子集团有限公司 | Searching method for TV programme signal |
| CN101809995B (en) * | 2007-08-08 | 2012-09-05 | 联发科技股份有限公司 | Apparatuses and methods for scanning digital and analog television channels |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1157461A1 (en) | 2001-11-28 |
| KR20010102104A (en) | 2001-11-15 |
| WO2001045257A1 (en) | 2001-06-21 |
| JP2003517235A (en) | 2003-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |