TWI568209B - Satellite television signal distribution device with automatic update - Google Patents
Satellite television signal distribution device with automatic update Download PDFInfo
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- TWI568209B TWI568209B TW104108274A TW104108274A TWI568209B TW I568209 B TWI568209 B TW I568209B TW 104108274 A TW104108274 A TW 104108274A TW 104108274 A TW104108274 A TW 104108274A TW I568209 B TWI568209 B TW I568209B
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- 238000012423 maintenance Methods 0.000 description 4
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- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
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- 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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/458—Scheduling content for creating a personalised stream, e.g. by combining a locally stored advertisement with an incoming stream; Updating operations, e.g. for OS modules ; time-related management operations
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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Description
本發明是有關一種衛星電視訊號分配裝置，特別是一種自動更新之單纜多用戶之衛星電視訊號分配裝置。The invention relates to a satellite television signal distribution device, in particular to an automatically updated single cable multi-user satellite television signal distribution device.
欲收看衛星電視需先安裝碟型天線接收衛星訊號，再以低雜訊降頻器(Low-Noise Block converter，LNB)以及單纜之衛星訊號切換裝置處理衛星訊號後輸出至用戶端。然而，單纜之衛星訊號切換裝置僅供單用戶使用，對於集合住宅單位(multi-dwelling unit，MDU)，例如公寓或大廈等多用戶之住宅環境，則需要多用戶之衛星電視訊號分配裝置。To watch satellite TV, you need to install a dish antenna to receive satellite signals, then use a low-noise block converter (LNB) and a single-cable satellite signal switching device to process satellite signals and output them to the user. However, the single-cable satellite signal switching device is for single-user use. For a multi-dwelling unit (MDU), such as a multi-user residential environment such as an apartment or a building, a multi-user satellite television signal distribution device is required.
基於衛星租約到期或其它因素，營運商所提供之節目之衛星頻率可能有所變動。可是內建於多用戶之衛星電視訊號分配裝置之軟體或頻率對照表不易更新。舉例而言，若營運商想要更改內建之資料，必須派遣維修人員至現場以電腦連接更新，導致維護的金錢及時間成本增加。或者，可透過用戶機上盒(set top box，STB)以特殊非標準Diseqc指令更新內建之資料。然而，在多用戶系統中，機上盒數量多又各有不同權限，加上Diseqc資料傳輸速率低且耗時、更新時用戶無法正常收看電視且不能中途關閉電源，以及用戶行為難以預測等因素，因此，多用戶之衛星電視訊號分配裝置在軟體或頻率對照表的更新上有許多困難及限制。Satellite frequencies for programs offered by operators may vary based on satellite lease expiration or other factors. However, the software or frequency comparison table of the satellite TV signal distribution device built in multi-user is not easy to update. For example, if an operator wants to change the built-in information, it must dispatch maintenance personnel to the site to update the computer connection, resulting in increased cost of maintenance and time. Alternatively, the built-in data can be updated with a special non-standard Diseqc command via the set top box (STB). However, in a multi-user system, the number of on-board boxes is different and each has different permissions. In addition, the Diseqc data transmission rate is low and time-consuming, the user cannot watch the TV normally when updating, and the power cannot be turned off midway, and the user behavior is difficult to predict. Therefore, the multi-user satellite television signal distribution device has many difficulties and limitations in updating the software or frequency comparison table.
綜上所述，如何以簡便的方式更新多用戶之衛星電視訊號分配裝置之內建資料便是目前極需努力的目標。In summary, how to update the built-in data of a multi-user satellite television signal distribution device in a simple manner is an urgent task.
本發明提供一種自動更新之衛星電視訊號分配裝置，其是在衛星電視廣播訊號中嵌入更新資料，以供衛星電視訊號分配裝置調諧及解調出更新資料來自動更新衛星電視訊號分配裝置之內建資料，藉以簡化更新程序而無需依賴用戶機上盒或維修人員至現場執行更新。The invention provides an automatically updated satellite television signal distribution device, which is configured to embed updated data in a satellite television broadcast signal for the satellite television signal distribution device to tune and demodulate the updated data to automatically update the built-in of the satellite television signal distribution device. Information to simplify the update process without relying on the user's set-top box or maintenance personnel to perform updates on site.
本發明一實施例之自動更新之衛星電視訊號分配裝置包含一第一儲存單元、一衛星頻道重置器、一調諧及解調裝置以及一處理單元。第一儲存單元用以儲存一第一頻率對照表。衛星頻道重置器用以接收多個衛星電視廣播訊號，並依據第一頻率對照表將多個衛星電視廣播訊號移轉至不同之多個傳輸頻率，以輸出一移頻訊號，其中移頻訊號透過一單一電纜輸出至多個用戶之衛星電視接收機上盒，以及包含一第二頻率對照表。調諧及解調裝置用以擷取移頻訊號，並調諧及解調移頻訊號中所載之第二頻率對照表。處理單元與調諧及解調裝置電性連接，用以依據第二頻率對照表自動更新第一頻率對照表。The automatically updated satellite television signal distribution apparatus according to an embodiment of the invention comprises a first storage unit, a satellite channel resetter, a tuning and demodulating device, and a processing unit. The first storage unit is configured to store a first frequency comparison table. The satellite channel resetter is configured to receive a plurality of satellite television broadcast signals, and move the plurality of satellite television broadcast signals to different transmission frequencies according to the first frequency comparison table to output a frequency shift signal, wherein the frequency shift signal is transmitted through A single cable is output to a plurality of users' satellite television receiver boxes, and a second frequency comparison table is included. The tuning and demodulating device is configured to capture the frequency shift signal and to tune and demodulate the second frequency comparison table contained in the frequency shift signal. The processing unit is electrically connected to the tuning and demodulating device for automatically updating the first frequency comparison table according to the second frequency comparison table.
以下藉由具體實施例配合所附的圖式詳加說明，當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。The purpose, technical contents, features, and effects achieved by the present invention will become more apparent from the detailed description of the appended claims.
以下將詳述本發明之各實施例，並配合圖式作為例示。除了這些詳細說明之外，本發明亦可廣泛地施行於其它的實施例中，任何所述實施例的輕易替代、修改、等效變化都包含在本發明之範圍內，並以申請專利範圍為準。在說明書的描述中，為了使讀者對本發明有較完整的瞭解，提供了許多特定細節；然而，本發明可能在省略部分或全部特定細節的前提下，仍可實施。此外，眾所周知的步驟或元件並未描述於細節中，以避免對本發明形成不必要之限制。圖式中相同或類似之元件將以相同或類似符號來表示。特別注意的是，圖式僅為示意之用，並非代表元件實際之尺寸或數量，有些細節可能未完全繪出，以求圖式之簡潔。The embodiments of the present invention will be described in detail below with reference to the drawings. In addition to the detailed description, the present invention may be widely practiced in other embodiments, and any alternatives, modifications, and equivalent variations of the described embodiments are included in the scope of the present invention. quasi. In the description of the specification, numerous specific details are set forth in the description of the invention. In addition, well-known steps or elements are not described in detail to avoid unnecessarily limiting the invention. The same or similar elements in the drawings will be denoted by the same or similar symbols. It is to be noted that the drawings are for illustrative purposes only and do not represent the actual dimensions or quantities of the components. Some of the details may not be fully drawn in order to facilitate the simplicity of the drawings.
請參照圖1，本發明之一實施例之自動更新之衛星電視訊號分配裝置10包含一衛星頻道重置器11、一第一儲存單元12、一調諧及解調裝置13以及一處理單元14。第一儲存單元12用以儲存一第一頻率對照表。衛星頻道重置器11用以接收多個衛星電視廣播訊號BS，並依據儲存於第一儲存單元12之第一頻率對照表將多個衛星電視廣播訊號BS移轉至不同之多個傳輸頻率，以輸出一移頻訊號CSS。舉例而言，請參照圖2，衛星頻道重置器11所接收到之多個衛星電視廣播訊號BS之輸入頻率順序為T11、T12、T13、T14…、T21、T22、T23、T24…、T31、T32、T33、T34…、T41、T42、T43、T44…。經衛星頻道重置器11移頻處理後被重新配置，其輸出頻率順序可能變更例如為T11、T21、T31、T41、T12、T22、T32、T42、T13、T23…。可以理解的是，同一節目經衛星頻道重置器11之移頻處理後之傳輸頻率可為相異或相同。Referring to FIG. 1, an automatically updated satellite television signal distribution apparatus 10 according to an embodiment of the present invention includes a satellite channel resetter 11, a first storage unit 12, a tuning and demodulating device 13, and a processing unit 14. The first storage unit 12 is configured to store a first frequency comparison table. The satellite channel resetter 11 is configured to receive a plurality of satellite television broadcast signals BS, and move the plurality of satellite television broadcast signals BS to different transmission frequencies according to the first frequency comparison table stored in the first storage unit 12. To output a frequency shift signal CSS. For example, referring to FIG. 2, the input frequency sequence of the plurality of satellite television broadcast signals BS received by the satellite channel resetter 11 is T11, T12, T13, T14, ..., T21, T22, T23, T24, ..., T31. , T32, T33, T34..., T41, T42, T43, T44.... After being frequency-shifted by the satellite channel resetter 11, it is reconfigured, and its output frequency sequence may be changed, for example, to T11, T21, T31, T41, T12, T22, T32, T42, T13, T23, . It can be understood that the transmission frequency of the same program after the frequency shift processing by the satellite channel resetter 11 can be different or the same.
於一實施例中，衛星頻道重置器11以及第一儲存單元12可經由匯流排16彼此電性連接，如此，衛星頻道重置器11可經由匯流排16存取儲存於第一儲存單元12中之第一頻率對照表。移頻訊號CSS是透過一單一電纜(例如同軸電纜)輸出至多個用戶之衛星電視接收機上盒20。此外，移頻訊號CSS亦包含一第二頻率對照表。可以理解的是，第二頻率對照表可嵌入衛星電視廣播訊號BS中，如此，衛星電視訊號分配裝置10即可經由接收衛星電視廣播訊號BS獲得第二頻率對照表。於一實施例中，第一以及第二頻率對照表包含每一衛星電視廣播訊號BS之一輸入頻率以及經衛星頻道重置器11移頻後相對應輸出之傳輸頻率。In one embodiment, the satellite channel resetter 11 and the first storage unit 12 can be electrically connected to each other via the bus bar 16 . Thus, the satellite channel resetter 11 can be accessed and stored in the first storage unit 12 via the bus bar 16 . The first frequency comparison table in the middle. The frequency shift signal CSS is a satellite television receiver upper box 20 that is output to a plurality of users through a single cable (for example, a coaxial cable). In addition, the frequency shift signal CSS also includes a second frequency comparison table. It can be understood that the second frequency comparison table can be embedded in the satellite television broadcast signal BS, so that the satellite television signal distribution device 10 can obtain the second frequency comparison table via the receiving satellite television broadcast signal BS. In one embodiment, the first and second frequency comparison tables include an input frequency of one of each satellite television broadcast signal BS and a transmission frequency of the corresponding output after frequency shift by the satellite channel resetter 11.
接續上述說明，調諧及解調裝置13擷取衛星頻道重置器11所輸出之移頻訊號CSS，並調諧及解調移頻訊號CSS，以獲得其中之第二頻率對照表並輸出。處理單元14與調諧及解調裝置13電性連接。處理單元14可依據調諧及解調裝置13所輸出第二頻率對照表更新第一頻率對照表。舉例而言，處理單元14可經由匯流排16與第一儲存單元12電性連接，以更新第一頻率對照表。於一實施例中，在不需要更新第一頻率對照表時，移頻訊號CSS中可不含第二頻率對照表。當偵測到移頻訊號CSS包含較新之第二頻率對照表時，處理單元14即以第二頻率對照表更新第一頻率對照表。或者，移頻訊號CSS可經常性地包含第二頻率對照表，而處理單元14週期性比對第一頻率對照表以及第二頻率對照表。若二者具有差異，處理單元14即以第二頻率對照表更新第一頻率對照表。於一實施例中，移頻訊號CSS亦可包含第二頻率對照表之一版本編號。如此，處理單元14可比對第二頻率對照表之版本編號是否較第一頻率對照表之版本編號為新，若是，即以第二頻率對照表更新第一頻率對照表。Following the above description, the tuning and demodulating device 13 captures the frequency-shifted signal CSS outputted by the satellite channel resetter 11, and tunes and demodulates the frequency-shifted signal CSS to obtain a second frequency comparison table and outputs it. The processing unit 14 is electrically connected to the tuning and demodulating device 13. The processing unit 14 may update the first frequency comparison table according to the second frequency comparison table output by the tuning and demodulating device 13. For example, the processing unit 14 can be electrically connected to the first storage unit 12 via the bus bar 16 to update the first frequency comparison table. In an embodiment, when the first frequency comparison table is not required to be updated, the second frequency comparison table may not be included in the frequency shift signal CSS. When it is detected that the frequency shift signal CSS includes a newer second frequency comparison table, the processing unit 14 updates the first frequency comparison table with the second frequency comparison table. Alternatively, the frequency shift signal CSS can often include a second frequency look-up table, and the processing unit 14 periodically compares the first frequency look-up table with the second frequency look-up table. If there is a difference between the two, the processing unit 14 updates the first frequency comparison table with the second frequency comparison table. In an embodiment, the frequency shift signal CSS may also include a version number of the second frequency comparison table. In this manner, the processing unit 14 can compare whether the version number of the second frequency comparison table is newer than the version number of the first frequency comparison table, and if so, update the first frequency comparison table with the second frequency comparison table.
於一實施例中，移頻訊號CSS更包含第二頻率對照表之一啟用時間。處理單元14即可依據啟用時間，決定何時更新第一頻率對照表，亦即啟用第二頻率對照表。如此，藉由設定適當之啟用時間，處理單元14有較充裕的時間收集到完整的第二頻率對照表。而多個不同社區之衛星電視訊號分配裝置10可同時啟用第二頻率對照表，讓多個用戶可接收到一致的節目內容。In an embodiment, the frequency shift signal CSS further includes an activation time of one of the second frequency comparison tables. The processing unit 14 can decide when to update the first frequency comparison table according to the activation time, that is, enable the second frequency comparison table. Thus, by setting the appropriate enable time, the processing unit 14 has ample time to collect the complete second frequency look-up table. The satellite television signal distribution device 10 of a plurality of different communities can simultaneously enable the second frequency comparison table so that multiple users can receive consistent program content.
請再參照圖1，於一實施例中，本發明之衛星電視訊號分配裝置10更包含一第二儲存單元15，其與處理單元14電性連接。舉例而言，第二儲存單元15可經由匯流排16與處理單元14電性連接。由於處理單元14可能無法一次獲得完整之第二頻率對照表，因此，處理單元14收集到部分第二頻率對照表時可先儲存於第二儲存單元15。待收集到完整之第二頻率對照表時，再以第二頻率對照表更新第一頻率對照表。但不限於此，於一實施例中，處理單元14僅接收到部分較新之第二頻率對照表時，亦可部分更新第一頻率對照表。Referring to FIG. 1 again, in an embodiment, the satellite television signal distribution device 10 of the present invention further includes a second storage unit 15 electrically connected to the processing unit 14. For example, the second storage unit 15 can be electrically connected to the processing unit 14 via the bus bar 16 . Since the processing unit 14 may not be able to obtain the complete second frequency comparison table at one time, the processing unit 14 may first store the partial second frequency comparison table in the second storage unit 15. When the complete second frequency comparison table is to be collected, the first frequency comparison table is updated with the second frequency comparison table. However, the method is not limited thereto. In an embodiment, when the processing unit 14 receives only a part of the newer second frequency comparison table, the first frequency comparison table may be partially updated.
為了避免更新失敗造成損毀第一頻率對照表，而導致衛星電視訊號分配裝置10無法正常運作，於一實施例中，衛星頻道重置器11所連接之第一儲存單元12可切分成兩個儲存區塊，以分別儲存兩份第一頻率對照表及軟體。當處理單元14正在將第二頻率對照表複製至第一儲存元件12之其中之一儲存區塊，第一儲存元件12之另一儲存區塊仍可繼續保持衛星頻道重置器11之正常運作，而不會因為另一儲存區塊之更新而影響衛星頻道重置器11正在進行之移頻工作。在第二儲存元件更新至第一儲存元件之其中之一儲存區塊完成之後，衛星頻道重置器11會改以第一儲存元件12之已更新儲存區塊中之頻率對照表執行移頻動作。In order to avoid the failure of the update, the first frequency comparison table is damaged, and the satellite television signal distribution device 10 fails to operate normally. In an embodiment, the first storage unit 12 connected to the satellite channel resetter 11 can be divided into two storages. Block to store two copies of the first frequency comparison table and software. When the processing unit 14 is copying the second frequency comparison table to one of the first storage elements 12, the other storage block of the first storage element 12 can continue to maintain the normal operation of the satellite channel resetter 11. The frequency shifting work that the satellite channel resetter 11 is performing is not affected by the update of another storage block. After the storage element is updated to one of the storage elements of the first storage element, the satellite channel resetter 11 performs a frequency shifting operation by using the frequency comparison table in the updated storage block of the first storage element 12. .
於一實施例中，第一儲存單元12以及第二儲存單元15可為不同之實體儲存元件。或者，第一儲存單元12以及第二儲存單元15亦可為同一儲存元件之不同儲存區塊，如此可降低電路設計的複雜度及零組件數量。In an embodiment, the first storage unit 12 and the second storage unit 15 can be different physical storage elements. Alternatively, the first storage unit 12 and the second storage unit 15 may also be different storage blocks of the same storage element, which may reduce the complexity of the circuit design and the number of components.
需注意者，上述說明僅更新衛星電視訊號分配裝置10內建之頻率對照表。但不限於此，衛星電視訊號分配裝置10內建之軟體亦能夠以上述方式加以更新。舉例而言，移頻訊號CSS可包含一更新軟體，調諧及解調裝置13從移頻訊號CSS解調出更新軟體，處理單元即可依據調諧及解調裝置13解調出之更新軟體更新衛星電視訊號分配裝置10之一內建軟體。It should be noted that the above description only updates the frequency comparison table built in the satellite television signal distribution device 10. However, the software built in the satellite television signal distribution device 10 can also be updated in the above manner. For example, the frequency shift signal CSS can include an update software, and the tuning and demodulating device 13 demodulates the update software from the frequency shift signal CSS, and the processing unit can update the updated software satellite according to the tuning and demodulating device 13. One of the television signal distribution devices 10 has built-in software.
綜合上述，本發明之自動更新之衛星電視訊號分配裝置是在衛星電視廣播訊號中嵌入更新資料，並在衛星電視訊號分配裝置設置一調諧及解調裝置以調諧及解調出移頻訊號中之更新資料，即頻率對照表及/或軟體。如此，本發明之衛星電視訊號分配裝置即可依據更新資料自動更新內建之頻率對照表及/或軟體，以簡化更新程序而無需依賴用戶機上盒或維修人員至現場執行更新。In summary, the automatically updated satellite television signal distribution device of the present invention embeds updated data in a satellite television broadcast signal, and provides a tuning and demodulating device in the satellite television signal distribution device to tune and demodulate the frequency shift signal. Update the data, ie the frequency comparison table and / or software. In this way, the satellite television signal distribution device of the present invention can automatically update the built-in frequency comparison table and/or software according to the updated data to simplify the update procedure without relying on the user's set-top box or maintenance personnel to perform the update on site.
以上所述之實施例僅是為說明本發明之技術思想及特點，其目的在使熟習此項技藝之人士能夠瞭解本發明之內容並據以實施，當不能以之限定本發明之專利範圍，即大凡依本發明所揭示之精神所作之均等變化或修飾，仍應涵蓋在本發明之專利範圍內。The embodiments described above are only intended to illustrate the technical idea and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.
10‧‧‧衛星電視訊號分配裝置
11‧‧‧衛星頻道重置器
12‧‧‧第一儲存單元
13‧‧‧調諧及解調裝置
14‧‧‧處理單元
15‧‧‧第二儲存單元
16‧‧‧匯流排
20‧‧‧衛星電視接收機上盒
BS‧‧‧衛星電視廣播訊號
CSS‧‧‧移頻訊號
T11~T44‧‧‧頻率10‧‧‧Satellite TV signal distribution device
11‧‧‧Satellite channel resetter
12‧‧‧First storage unit
13‧‧‧Tune and demodulation device
14‧‧‧Processing unit
15‧‧‧Second storage unit
16‧‧‧ Busbar
20‧‧‧ Satellite TV receiver box
BS‧‧‧Satellite television broadcasting signal
CSS‧‧‧frequency shift signal
T11~T44‧‧‧ frequency
圖1為一方塊圖，顯示本發明一實施例之自動更新之衛星電視訊號分配裝置。 圖2為一示意圖，顯示衛星電視廣播訊號之移頻處理結果。1 is a block diagram showing an automatically updated satellite television signal distribution apparatus according to an embodiment of the present invention. 2 is a schematic diagram showing the result of frequency shift processing of a satellite television broadcast signal.
10‧‧‧衛星電視訊號分配裝置 10‧‧‧Satellite TV signal distribution device
11‧‧‧衛星頻道重置器 11‧‧‧Satellite channel resetter
12‧‧‧第一儲存單元 12‧‧‧First storage unit
13‧‧‧調諧及解調裝置 13‧‧‧Tune and demodulation device
14‧‧‧處理單元 14‧‧‧Processing unit
15‧‧‧第二儲存單元 15‧‧‧Second storage unit
16‧‧‧匯流排 16‧‧‧ Busbar
20‧‧‧衛星電視接收機上盒 20‧‧‧ Satellite TV receiver box
BS‧‧‧衛星電視廣播訊號 BS‧‧‧Satellite television broadcasting signal
CSS‧‧‧移頻訊號 CSS‧‧‧frequency shift signal
Claims (7)
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| TW104108274A TWI568209B (en) | 2015-03-16 | 2015-03-16 | Satellite television signal distribution device with automatic update |
| CN201610144010.1A CN105992052B (en) | 2015-03-16 | 2016-03-14 | Automatic updating satellite television signal distribution device |
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|---|---|---|---|---|
| CN1953520A (en) * | 2005-10-21 | 2007-04-25 | 神基科技股份有限公司 | Radio receiving system and radio signal search method |
| CN100518255C (en) * | 2006-04-11 | 2009-07-22 | 佳世达科技股份有限公司 | Channel conversion method, system and storage media |
| CN101557508A (en) * | 2008-04-11 | 2009-10-14 | 台扬科技股份有限公司 | Method of channel distribution and low-noise frequency demultiplier |
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| CN1953520A (en) * | 2005-10-21 | 2007-04-25 | 神基科技股份有限公司 | Radio receiving system and radio signal search method |
| CN100518255C (en) * | 2006-04-11 | 2009-07-22 | 佳世达科技股份有限公司 | Channel conversion method, system and storage media |
| CN101557508A (en) * | 2008-04-11 | 2009-10-14 | 台扬科技股份有限公司 | Method of channel distribution and low-noise frequency demultiplier |
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