CN101365101B - Ciphering channel playing method and set-top box - Google Patents
Ciphering channel playing method and set-top box Download PDFInfo
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- CN101365101B CN101365101B CN200810223535XA CN200810223535A CN101365101B CN 101365101 B CN101365101 B CN 101365101B CN 200810223535X A CN200810223535X A CN 200810223535XA CN 200810223535 A CN200810223535 A CN 200810223535A CN 101365101 B CN101365101 B CN 101365101B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000013475 authorization Methods 0.000 claims abstract description 156
- 238000004891 communication Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 230000002452 interceptive effect Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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Abstract
The invention relates to the encrypted TV field and provides a method for playing an encrypted channel and a set-top box to solve the problem of low efficiency in playing the prior encrypted TV. The set-top box receives data of the system end, and the method is characterized in that the method includes the following steps: the system end produces a basic authorization form and sends the form to the set-top box of the user end; when playing the encrypted channel, the set-top box decrypts and plays the encrypted channel according to the basic authorization form, and in the mean time, detects whether other products authorization forms have the authorization information of the encrypted channel in the IC card of the set-top box besides the basic authorization form which has the authorization information of the encrypted channel: if yes, the channel can be played normally, otherwise a shield is used for shielding the picture of the encrypted channel that is being played. The method has the beneficial effects of effectively utilizing the display area of a display unit, and displaying more useful information in unauthorized channels, thus improving displaying efficiency.
Description
Technical field
The present invention relates to the scrambled TV service field, particularly the pay TV technology is a kind of player method and set-top box of encoded channel concretely.
Background technology
Interactive TV is a kind ofly to propagate, play form by the audio frequency and video of terminal use's controls playing process with digital form.The application of existing interactive TV is more and more universal, and the user is by receiving interactive TV program as terminal equipments such as set-top box, deal with data business and the parsing of finishing multiple application.
Pass through to encrypt the control that realizes user's program receiving in the prior art, if the user has bought this program, then has corresponding decipher function, if the user does not buy this program, then can't be decrypted, thereby when accepting this program, can only watch the interface of blank screen or blue screen this program.
Chinese patent publication number CN1348659A for example, denomination of invention is the patent of invention of " digital broadcast program ordering ", the scheme of a kind of utilization by the predetermined pay TV programs in the Internet disclosed, the user who uses this scheme do not have authorized in, can't watch any Useful Information on the video screen, waste the space in the on-screen display (osd) area.
Chinese patent publication number CN101179698A, name is called the patent of invention of " a kind of interactive TV playing device and system, player method and program ", disclose a kind of force users and watched the scheme of advertisement, under the situation that this scheme does not have to authorize the user, can force users watch irrelevant informations such as advertisement, the user can't recognize whether this program is that oneself is liked or wants the program watched, when the user buys this program relatively blindly.
In the introducing mode it is herein incorporated.
Summary of the invention
The object of the present invention is to provide a kind of player method of encoded channel, the on-screen display (osd) area of wasting when being used for solving prior art user watching encrypted channel, display efficiency is not high, and can obtain useful information to the user anywhere or anytime.
Another object of the present invention is to provide a kind of set-top box, be used to realize said method, solve the not high problem of display efficiency in the prior art, and do not need to revise existing set-top box on a large scale, just can realize above-mentioned purpose, cost is low.
To achieve these goals, the embodiment of the invention provides a kind of player method of encoded channel, comprises, described set-top box receives the data of described system end, it is characterized in that this method comprises, system end is made basic authorization list and sent to the user side set-top box; Described set-top box is when playing encoded channel, be decrypted and play according to described basic authorization list, in described broadcast, described set-top box detects to be had the authorization message current encoded channel except described basic authorization list in the IC-card of described set-top box, whether also have other product authorization list to have the authorization message of this encoded channel, if have then normal play, block in progress encoded channel picture otherwise call a shelter.
A further aspect according to the player method of a kind of encoded channel of the present invention, blocked before in progress encoded channel picture step at the described shelter that calls, also comprise and start a timer step, when just calling described shelter during greater than a predetermined threshold value, described timer blocks in progress encoded channel picture, otherwise the described encoded channel of normal play.
Another further aspect according to the player method of a kind of encoded channel of the present invention, set-top box is when the receiving system end data, obtain the version number of the described shelter of described system end transmission simultaneously, if shelter version number is inconsistent in described system end shelter version number and the described set-top box, then download corresponding shelter from system end.
Another further aspect according to the player method of a kind of encoded channel of the present invention, block after in progress encoded channel picture step calling described shelter, when if the user has obtained the mandate of this encoded channel, described system end is made the corresponding product authorization list that comprises this encoded channel authorization message and is sent to the user side set-top box.
According to another further aspect of the player method of a kind of encoded channel of the present invention, described shelter comprises voice data or dynamic video data or picture, perhaps the combination of voice data, dynamic video data, picture.
According to another further aspect of the player method of a kind of encoded channel of the present invention, when described shelter is dynamic video or picture, block on described in progress encoded channel picture, occupy at least 1/2 of described encoded channel picture.
To achieve these goals, the embodiment of the invention also provides a kind of set-top box, comprises communication unit, the descrambling unit, and the audio frequency and video output unit is characterized in that this set-top box also comprises, IC-card processing unit, product mandate search unit;
The basic authorization list that described communication unit receiving system end sends, described IC-card processing unit utilizes described basic authorization list that encoded channel is decrypted, described descrambling unit carries out descrambling according to the decrypted result of described IC-card processing unit to audio, video data, and sends the audio frequency and video output unit to; Described product mandate search unit detects in the IC-card by the IC-card processing unit to be had the authorization message current encoded channel except described basic authorization list, whether also have other product authorization list to have the authorization message of this encoded channel, if have then do not deal with, export to described audio frequency and video output unit otherwise call shelter, block on the picture behind the descrambling.
A further aspect according to a kind of set-top box of the present invention, also comprise a timer, be connected in described product mandate search unit, when described timer during greater than a predetermined threshold value, described product mandate search unit just calls described shelter and blocks on the picture behind the descrambling.
Another further aspect according to a kind of set-top box of the present invention, also comprise the shelter updating block, be connected between described product mandate search unit and the communication unit, when described communication unit receiving system end data, obtain the version number of the described shelter of described system end transmission simultaneously, if described system end shelter version number and the shelter version number that is stored in the described shelter updating block are inconsistent, then download corresponding shelter from system end.
According to another further aspect of a kind of set-top box of the present invention, described shelter comprises voice data or dynamic video data or picture, perhaps the combination of voice data, dynamic video data, picture.
The beneficial effect of the embodiment of the invention is, the user can watch the TV programme of channel in a period of time, thereby can whether to buy corresponding product according to the hobby decision, and effectively utilized the viewing area of display unit, can in not having the channel of authorizing, show and strengthen the efficient that shows by more useful informations; And the set-top box that realizes this method does not need large-scale upgrading set top box hardware device, and it is low to revise cost.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Figure 1 shows that the player method flow chart of encoded channel of the present invention;
Figure 2 shows that prior art authorization list embodiment schematic diagram;
Figure 3 shows that the another embodiment schematic diagram of prior art authorization list;
Figure 4 shows that the present invention basis authorization list embodiment schematic diagram;
Figure 5 shows that the another embodiment flow chart of watching encrypted channel method of the present invention;
Figure 6 shows that set-top box structural representation of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer,, the present invention is described in further details below in conjunction with execution mode and accompanying drawing.At this, exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
The embodiment of the invention provides a kind of player method and set-top box of encoded channel.The present invention is described in detail below in conjunction with accompanying drawing.
Be illustrated in figure 1 as the player method flow chart of encoded channel of the present invention.
Step 101, system end carries out the basis mandate with all channels, promptly allows the user to watch all channels, and above-mentioned basic authorized content is made basic authorization list.
In the existing authorization list, be illustrated in figure 2 as prior art authorization list embodiment schematic diagram, wherein the authorization list of each product is made of channel number and authorization message separately, according to shown in Figure 2, in the authorization list of product 1, channel number is that the authorization message of CCTV1 and CCTV2 is 1, and remaining channel is 0, be that to have only channel number in the product 1 be that the channel of CCTV1 and CCTV2 is obtained the authorization, the user can only watch the audio/video program of CCTV1 and CCTV2; Be illustrated in figure 3 as the another embodiment schematic diagram of prior art authorization list, in the authorization list of product 2, channel number is that the authorization message of CCTV3, CCTV4 and CCTV5 is 1, remaining channel is 0, be that to have only channel number in the product 2 be that the channel of CCTV3, CCTV4 and CCTV5 is obtained the authorization, the user can only watch the audio/video program of CCTV3, CCTV4 and CCTV5.Be illustrated in figure 4 as the present invention basis authorization list embodiment schematic diagram, system end is made a basic authorization list with all channel packings, the channel that promptly should basis authorization list mid band be numbered CCTV1 to CCTV5 is all obtained the authorization, the audio/video program that the user can all CCTV1 to CCTV5.
Wherein said product comprises one or more channel, perhaps the program in the specific period in certain channel.
Whether step 106 judges described timer greater than scheduled time threshold value, if greater than described scheduled time threshold value then enter step 107, otherwise returns step 105.Wherein, the threshold value of the described scheduled time receives when described set-top box receiving system end data, and is stored in the set-top box memory, and the threshold value of this scheduled time can be set by system end, system end can be adjusted the time of blocking and showing flexibly according to the operation situation like this.
Step 107 is called a shelter that is stored in set-top box and is blocked the in progress program of described video screen.The size of the shared screen of wherein said shelter just accounts for 1/2 of screen area at broadcast program greater than described at least.Described shelter comprises, picture, dynamic video data, voice data perhaps are the combination of these several data.The content of described picture, dynamic video data, voice data can be advertising message or other advertising messages of channel subscription.
As preferred embodiment, above-mentioned shelter is stored in the set-top box, also comprise a shelter step of updating, before described step 101, during set-top box receiving system end data, also obtain the version number that system end is directed to described shelter simultaneously, if shelter version number is inconsistent in described system end shelter version number and the described set-top box, then download corresponding shelter, to guarantee blocking current in progress audio/video program calling up-to-date described shelter from system end.
As preferred embodiment, after the described step 107 of execution is blocked, carry out after step 108 carries out one section preset time, return step 103, the user has bought the power of watching of the corresponding channel that is blocked, and then can pass the set-top box of corresponding product authorization list to the user down from system end, has stored the product authorization message except that basic authorization list is authorized the basis of this channel at this moment in the IC-card of set-top box, enter step 104 this moment, and the audio, video data that receives is carried out normal play.
Be illustrated in figure 5 as the another embodiment flow chart of watching encrypted channel method of the present invention.
Step 501, system end carries out the basis mandate with all channels, promptly allows the user to watch all channels, and above-mentioned basic authorized content is made basic authorization list.
In the existing authorization list, be illustrated in figure 2 as prior art authorization list embodiment schematic diagram, wherein the authorization list of each product is made of channel number and authorization message separately, according to shown in Figure 2, in the authorization list of product 1, channel number is that the authorization message of CCTV1 and CCTV2 is 1, and remaining channel is 0, be that to have only channel number in the product 1 be that the channel of CCTV1 and CCTV2 is obtained the authorization, the user can only watch the audio/video program of CCTV1 and CCTV2; Be illustrated in figure 3 as the another embodiment schematic diagram of prior art authorization list, in the authorization list of product 2, channel number is that the authorization message of CCTV3, CCTV4 and CCTV5 is 1, remaining channel is 0, be that to have only channel number in the product 2 be that the channel of CCTV3, CCTV4 and CCTV5 is obtained the authorization, the user can only watch the audio/video program of CCTV3, CCTV4 and CCTV5.Be illustrated in figure 4 as the present invention basis authorization list embodiment schematic diagram, system end is made a basic authorization list with all channel packings, the channel that promptly should basis authorization list mid band be numbered CCTV1 to CCTV5 is all obtained the authorization, the audio/video program that the user can all CCTV1 to CCTV5.
Wherein said product comprises one or more channel, perhaps the program in the specific period in certain channel.
Step 502 sends to relative users set-top box end with the above-mentioned basic authorization list that has basic authorization message, and described set-top box is stored in described basic authorization list in the IC-card (if stored basic authorization list originally then replace original basic authorization list).When described set-top box is selected channel under user's control, system end sends to the control word (ECM) of this set-top box through encrypting, set-top box sends above-mentioned encrypted control word to IC-card, IC-card is given the authority of all channels being encrypted the control word deciphering with IC-card according to the basic authorization message in the described basic authorization list.
Step 504 is with the control word descrambling audio, video data of deciphering, this channel audio, video data of normal play.
As preferred embodiment, above-mentioned shelter is stored in the set-top box, also comprise a shelter step of updating, before described step 501, during set-top box receiving system end data, also obtain the version number that system end is directed to described shelter simultaneously, if shelter version number is inconsistent in described system end shelter version number and the described set-top box, then download corresponding shelter, to guarantee that calling up-to-date described shelter blocks current in progress audio/video program from system end.
As preferred embodiment, after the described step 505 of execution is blocked, carry out after step 506 carries out one section preset time, return step 503, the user has bought the power of watching of the corresponding channel that is blocked, and then can pass the set-top box of corresponding product authorization list to the user down from system end, has stored the product authorization message except that basic authorization list is authorized the basis of this channel at this moment in the IC-card of set-top box, enter step 504 this moment, and the audio, video data that receives is carried out normal play.
Be illustrated in figure 6 as set-top box structural representation of the present invention.Comprise communication unit 601, IC-card processing unit 602, descrambling unit 603, product mandate search unit 604, audio frequency and video output unit 605, timer 606, shelter updating block 607.
Described communication unit 601 is connected with system end, described communication unit 601 is connected with described IC-card processing unit 602, described communication unit 601 is connected with descrambling unit 603 respectively with IC-card processing unit 602, described descrambling unit 603 is connected with described audio frequency and video output unit 605, described IC-card processing unit 602 is connected with described product mandate search unit 604, and described product mandate search unit 604 is connected with described audio frequency and video output unit 605.
Described communication unit 601 is used for communicating with system end, and the receiving system end sends data, and described data comprise basic authorization list and product authorization list, control word, audio, video data etc.
Described IC-card processing unit 602 is used for obtaining basic authorization list and product authorization list and being stored in described IC-card from communication unit 601, and according to described authorization list control word is decrypted, and the control word of deciphering is exported to descrambling unit 603.
Described descrambling unit 603 is used for audio, video data is carried out descrambling, sends audio frequency and video output unit 605 to, outputs on the display unit such as TV to play.
Described product mandate search unit 604, be used for being directed to current channel retrieval IC-card except basic authorization list whether in addition other product authorization list comprise the authorization message of this channel, if have then do not deal with, otherwise the shelter that will be stored in described product mandate search unit 604 is exported to display unit such as TVs by audio frequency and video output unit 605, and shelter is blocked on described audio/video program picture.
As preferred embodiment, also comprise a timer 606, be connected in described product mandate search unit 604, in an IC-card of time search of presetting, whether have except basic authorization list, whether to also have the authorization message that includes current channel in the other products authorization list; And there is not corresponding other products authorization message the basic authorization message of current channel in basic authorization list, then start timing, after default time, notify described product mandate search unit 604 to call shelter the audio/video program of current broadcast is blocked.
As preferred embodiment, also comprise a shelter updating block 607, be connected between described product mandate search unit 604 and the described communication unit 601, the version number of storage shelter, if communication unit receives shelter version number that system end transmits and product mandate search unit 604 when inconsistent, described shelter updating block 607 is downloaded up-to-date shelter from described system end, and is stored in product mandate search unit 604.Described shelter comprises, picture, dynamic video data, voice data perhaps are the combination of these several data, can comprise also in the described shelter how guides user buys method or other advertising messages of this channel.
System end generates the basic authorization list that allows the user can watch all channels, sends to the user side set-top box with the form of broadcasting.The set-top box communication unit 601 of user side receives this information, and above-mentioned basic authorization list is stored in the IC-card by IC-card processing unit 602, when user's controller top box is watched certain channel, system end is passed the control word that process is encrypted back to this set-top box, IC-card processing unit 602 finds this channel authorization information in the basic authorization list in IC-card, control word is decrypted, audio, video data by 603 pairs of these channels in descrambling unit carries out descrambling, and send audio frequency and video output unit 605 to and export, on display unit such as TV, play.If product mandate search unit 604 does not search the authorization message that the other products authorization list is directed to this channel except basic authorization list when Searching I C card, then start a timer 606, after with the scheduled time, call shelter, be that picture, dynamic video data, voice data etc. are to 605 outputs of audio frequency and video output unit, be shown on user's the display unit such as TV with normal TV programme, wherein, described shelter is shown in normal tv program front, makes the user can only see sub-fraction or can't see normal tv program picture fully.Also can there be the authorization message that is directed to this channel in described product mandate search unit 604 in not retrieving the other products authorization list, then directly use shelter to export to described audio frequency and video output unit 605.
Described shelter updating block 607, when set-top box starts or when communication unit 601 obtains the data of system end transmission, whether the shelter version number in the testing product mandate search unit 604 is the same with the shelter version number that receives from system end, if different then download up-to-date shelter, otherwise do not deal with from system end.
Following is the inventive method embodiment, system end is with basic authorization list called after ProductID=1000, the authorization list of product 1 is ProductID=999, has comprised CCTV1 and CCTV2 in the mandate of product 1, has stored ProductID=999 in the IC-card of user side set-top box.
When the user side set-top box is received the ProductID=1000 that system end sends, it is stored in the IC-card, then when playing the CCTV1 channel, whether all authorization lists in the Searching I C of the elder generation card comprise the authorization message of this channel of CCTV1, search the authorization message that in ProductID=1000, has this channel, and the authorization message that this channel is also arranged in Product ID=999 then normally shows this channel.
When if the user plays the CCTV3 channel, whether all authorization lists in the Searching I C of the elder generation card comprise the authorization message of this channel of CCTV3, search the authorization message that in ProductID=1000, has this channel, and there is not to have in other the product authorization list authorization message of this channel, then start a timer, the normal content of TV program that shows CCTV3 in the predefined time is then transferred a picture and is blocked on described CCTV3 channel TV programme content when arrival preestablishes the time.
After the user has bought this channel, promptly obtained the mandate of CCTV3 after, system end has wherein comprised CCTV3 in the mandate of product 2 with the authorization list ProductID=998 of corresponding product 2.Set-top box Searching I C card has the authorization message of this channel in ProductID=1000, also comprise this authorization message in the authorization list of Product ID=998 product 2 in addition, then normally show the content of TV program of CCTV3.
Beneficial effect of the present invention is, the user can watch the TV programme of channel in a period of time, thereby can whether to buy corresponding product according to the hobby decision, and effectively utilized the viewing area of display unit, can in not having the channel of authorizing, show and strengthen the efficient that shows by more useful informations.If with the content of shelter specific be the advertising message of ordering products or channel, the means of user's viewing experience then can also be provided, can well increase the order rate of paying encoded channel, and the blank screen when will not order changes to picture and text and block frame, can realize newly-increased advertisement value.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the player method of an encoded channel comprises, described set-top box receives the data of described system end, it is characterized in that this method comprises, system end is made basic authorization list and sent to the user side set-top box; Described set-top box is when playing encoded channel, be decrypted and play according to described basic authorization list, in described broadcast, described set-top box detects to be had the authorization message current encoded channel except described basic authorization list in the IC-card of described set-top box, whether also have other product authorization list to have the authorization message of this encoded channel, if have then normal play, block in progress encoded channel picture otherwise call a shelter.
2. the player method of a kind of encoded channel according to claim 1, it is characterized in that, blocked before in progress encoded channel picture step at the described shelter that calls, also comprise and start a timer step, when just calling described shelter during greater than a predetermined threshold value, described timer blocks in progress encoded channel picture, otherwise the described encoded channel of normal play.
3. the player method of a kind of encoded channel according to claim 1 and 2, it is characterized in that, set-top box is when the receiving system end data, obtain the version number of the described shelter of described system end transmission simultaneously, if shelter version number is inconsistent in described system end shelter version number and the described set-top box, then download corresponding shelter from system end.
4. the player method of a kind of encoded channel according to claim 1, it is characterized in that, block after in progress encoded channel picture step calling described shelter, when if the user has obtained the mandate of this encoded channel, described system end is made the corresponding product authorization list that comprises this encoded channel authorization message and is sent to the user side set-top box.
5. the player method of a kind of encoded channel according to claim 1 is characterized in that, described shelter comprises voice data or dynamic video data or picture, perhaps the combination of voice data, dynamic video data, picture.
6. the player method of a kind of encoded channel according to claim 5 is characterized in that, when described shelter is dynamic video or picture, blocks on described in progress encoded channel picture, occupies at least 1/2 of described encoded channel picture.
7. a set-top box comprises communication unit, the descrambling unit, and the audio frequency and video output unit is characterized in that this set-top box also comprises, IC-card processing unit, product mandate search unit;
The basic authorization list that described communication unit receiving system end sends, described IC-card processing unit utilizes described basic authorization list that encoded channel is decrypted, described descrambling unit carries out descrambling according to the decrypted result of described IC-card processing unit to audio, video data, and sends the audio frequency and video output unit to; Described product mandate search unit detects in the IC-card by the IC-card processing unit to be had the authorization message current encoded channel except described basic authorization list, whether also have other product authorization list to have the authorization message of this encoded channel, if have then do not deal with, export to described audio frequency and video output unit otherwise call shelter, block on the picture behind the descrambling.
8. a kind of set-top box according to claim 7, it is characterized in that, also comprise a timer, be connected in described product mandate search unit, when described timer during greater than a predetermined threshold value, described product mandate search unit just calls described shelter and blocks on the picture behind the descrambling.
9. according to claim 7 or 8 described a kind of set-top box, it is characterized in that, also comprise the shelter updating block, be connected between described product mandate search unit and the communication unit, when described communication unit receiving system end data, obtain the version number of the described shelter that described system end sends simultaneously,, then download corresponding shelter from system end if described system end shelter version number is inconsistent with the shelter version number that is stored in the described shelter updating block.
10. a kind of set-top box according to claim 7 is characterized in that, described shelter comprises voice data or dynamic video data or picture, perhaps the combination of voice data, dynamic video data, picture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810223535XA CN101365101B (en) | 2008-10-07 | 2008-10-07 | Ciphering channel playing method and set-top box |
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| CN200810223535XA CN101365101B (en) | 2008-10-07 | 2008-10-07 | Ciphering channel playing method and set-top box |
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| CN101365101A CN101365101A (en) | 2009-02-11 |
| CN101365101B true CN101365101B (en) | 2011-05-25 |
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| CN101883241A (en) * | 2010-06-02 | 2010-11-10 | 中兴通讯股份有限公司 | Method for encrypting mobile terminal television service, mobile terminal and server |
| CN101917587A (en) * | 2010-08-10 | 2010-12-15 | 华为终端有限公司 | Program filtering method and set-top box |
| CN102014306B (en) * | 2010-10-13 | 2012-06-20 | 福建新大陆通信科技股份有限公司 | Method for simultaneously deciphering multiple charge programs by set-top box |
| CN113473209A (en) * | 2021-07-06 | 2021-10-01 | 深圳市数力科技有限公司 | Management method of digital television pay program and computer storage medium |
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| CN101207752A (en) * | 2006-12-20 | 2008-06-25 | 乐金电子(中国)研究开发中心有限公司 | Method for user self-defining search of numeral household electrical appliance frequency channel |
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| CN101207752A (en) * | 2006-12-20 | 2008-06-25 | 乐金电子(中国)研究开发中心有限公司 | Method for user self-defining search of numeral household electrical appliance frequency channel |
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