201216640 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種廣播系統及應用於其之廣播方 法’且特別是有關於一種具多個數位調諧器之廣播系統及 應用於其之廣播方法。 【先前技術】 ^ 隨著科技的蓬勃發展，多媒體處理技術備受嘱目而且 發展快速。其中，又以即時多媒體（如電視以及廣播等） 處理技術與現代人的生活密切相關，在全世界有著廣大的 市場。於是，發產出多種數位廣播應用，如數位聲訊廣播 (Digital Audio Broadcasting，DAB )及數位視訊廣播 (Digital Video Broadcasting，DVB )。 ^其中，目前市面上發展出一種廣播系統，將數位廣播 知目藉由網路傳送給客戶端。由於目前數位廣播節目之頻 • 量眾多，因此此類廣播系統通常需使用多個數位調諧 器分別解調各數位節目，並同時將解調出之各數位廣播^ 給Ϊ戶端，供客戶端選擇。然而，為了能同時傳送 位郎目，廣播系統需具有相當大之 同時使多個數位购器進行解調，亦相當耗電威此外， 【發明内容】 ，系統客之一態樣是在提供一種廣播系統。廣播 中之一喚醒=到節目要求時，將多個數位調諸器的其 1解調包含客戶端所要求節目之傳輸串流。 4 201216640 廣播系統包含數個數位調諧器、一網路傳輸元件以及一控 制元件。網路傳輸元件與一網路建立連結。控制元件電性 連接各數位調諧器以及網路傳輸元件。控制元件包含一節 目要求接收模組、一調諧器喚醒模組以及一串流廣播模 組。節目要求接收模組透過網路傳輸元件，自網路上之至 少一客戶端，接收用以要求一欲收訊節目之一節目要求指 令。調諧器喚醒模組喚醒數位調諧器的其中之一，並使被 喚醒之數位調諧器根據欲收訊節目之資訊，解調一組傳輸 • 串流。其中，被解調之傳輸串流包含數個可選節目，欲收 訊節目為被解調之傳輸串流中的多個可選節目的其中之 一。串流廣播模組透過網路傳輸元件，廣播傳輸串流至網 路上之至少一客戶端。 本發明之另一態樣是在提供一種應用於一廣播系統之 廣播方法。廣播系統包含數個數位調諧器。在廣播方法中， 在自客戶端收到節目要求時，將多個數位調諧器的其中之 一喚醒，以解調包含客戶端所要求節目之傳輸串流。廣播 Φ 方法包含：自至少一客戶端，接收用以要求一欲收訊節目 之一節目要求指令。喚醒多個數位調諧器的其中之一。使 被喚醒之數位調諧器根據欲收訊節目之資訊，解調一組傳 輸串流。其中，被解調之傳輸串流包含數個可選節目，欲 收訊節目為可選節目的其中之一。廣播傳輸串流至至少一 客戶端。 應用本發明具有下列優點。數位調諧器係因應節目要 求而唤醒，因而可減少同時喚醒之數位調諧器之個數。此 外，由於數位調諧器喚醒後所需之功率消耗較大。因此， 201216640 減少同時喚醒之數位調諧器之個數可降低廣播系統之功率 消耗。另外，廣播系統不需持續傳送所有數位調諧器所解 調出之傳輸串流，因此可節省廣播系統所需之頻寬。同一 傳輸串流係藉由群播而廣播至所需之各客戶端，因而不需 重複被廣播，以節省廣播系統所需之頻寬。可在收訊之客 戶端閒置時，藉由停止廣播傳輸串流，節省廣播系統之頻 寬。此外，亦可在收訊之客戶端閒置時，藉由關閉數位調 諧器，節省廣播系統之耗電功率。 【實施方式】 以下將以圖式及詳細說明清楚說明本發明之精神，任 何所屬技術領域中具有通常知識者在瞭解本發明之較佳實 施例後，當可由本發明所教示之技術，加以改變及修飾， 其並不脫離本發明之精神與範圍。 請參照第1圖，其繪示依照本發明一實施方式的一種 廣播系統之功能方塊圖。廣播系統在自客戶端收到節目要 • 求時，將多個數位調諧器的其中之一喚醒，以解調包含客 戶端所要求節目之傳輸串流。 廣播系統100包含數個數位調諧器111、112、...、lln、 一網路傳輸元件120以及一控制元件130。網路傳輸元件 120與一網路300建立連結。其中，網路傳輸元件可為有 線或無線網路傳輸元件。數位調諧器111、112、...、lln 可為數位電視調諳器、數位廣播調諧器或其他類型之數位 調諧器。控制元件130電性連接各數位調諧器111、 112、…、lln以及網路傳輸元件120。 201216640 控制元件13G包含—節目要求接收模組m、批 器喚醒模組mq—串流賴模組133。節目要求= 模組131透過網路傳輸元件120，自網路300上之至少— 客戶端2U’接收用以要求一欲收訊節目之—節目要 令。調諧器喚醒模組132喚醒數位調諧器m、112、/ lln的其中之-’並使被喚醒之數位調稭器根據欲收 目之資訊’解調-組傳輸串流（Transp(m如咖，TS)。其 中’被解調之傳輸串流包含數個可選節目，欲收訊節目為 被解調之傳輸串流中的多個可選節目的其中之一。串流廣 播模組133透過網路傳輸元件12〇，廣播傳輸串流至網路 上,至少一客戶端211。如此一來，由於數位調諧器係因 應節目要求而喚醒，因而可減少同時唤醒之數位調諧器之 個數。此外，由於數位調諧器喚醒後所需之功率消耗較大。 因此，減少同時喚醒之數位調諧器之個數可降低廣播系統 100之功率消耗。另外，廣播系統1〇〇不需持續傳送所有 數位調譜器m、112、…、Un所解調出之傳輸串流，因201216640 VI. Description of the Invention: [Technical Field] The present invention relates to a broadcasting system and a broadcasting method applied thereto, and particularly to a broadcasting system having a plurality of digital tuners and a broadcasting system therefor method. [Prior Art] ^ With the rapid development of technology, multimedia processing technology has attracted attention and developed rapidly. Among them, the processing technology of instant multimedia (such as television and radio) is closely related to the life of modern people, and has a vast market all over the world. As a result, a variety of digital broadcast applications, such as Digital Audio Broadcasting (DAB) and Digital Video Broadcasting (DVB), have been produced. ^ Among them, a broadcasting system has been developed on the market to transmit digital broadcasts to the client through the Internet. Due to the large number of digital broadcast programs, such broadcast systems usually need to use multiple digital tuners to demodulate each digital program, and simultaneously demodulate the digital broadcasts to the client for the client. select. However, in order to be able to transmit a bit of Langmu at the same time, the broadcasting system needs to have a large amount of demodulation for a plurality of digital devices at the same time, and it is also quite power-consuming. In addition, one aspect of the system is to provide a kind of Broadcast system. One of the broadcasts wakes up = when the program is requested, the demodulation of the plurality of digitizers includes the transmission stream of the program requested by the client. 4 201216640 The broadcasting system consists of several digital tuners, a network transmission component and a control component. The network transport component establishes a connection with a network. The control element is electrically connected to each digital tuner and to the network transmission component. The control component includes a program request receiving module, a tuner wake-up module, and a streaming broadcast module. The program requires the receiving module to transmit components through the network, from at least one client on the network, to receive a program request command for requesting a program to be received. The tuner wake-up module wakes up one of the digital tuners and causes the awakened digital tuner to demodulate a set of transmissions/streams based on the information of the program to be received. The demodulated transmission stream includes a plurality of selectable programs, and the program to be received is one of a plurality of selectable programs in the demodulated transmission stream. The streaming broadcast module transmits the transmission stream to at least one client on the network through the network transmission component. Another aspect of the present invention is to provide a broadcast method applied to a broadcast system. The broadcast system contains several digital tuners. In the broadcast method, upon receiving a program request from the client, one of the plurality of digit tuners is woken up to demodulate the transport stream containing the program requested by the client. The broadcast Φ method includes receiving, from at least one client, a program request instruction for requesting a program to be received. Wake up one of several digital tuners. The awakened digital tuner demodulates a set of transmission streams based on the information of the program to be received. The demodulated transmission stream includes a plurality of optional programs, and the program to be received is one of the optional programs. The broadcast transmission stream is streamed to at least one client. The application of the present invention has the following advantages. The digital tuner wakes up in response to program requirements, thereby reducing the number of digital tuners that wake up at the same time. In addition, the power consumption required by the digital tuner after waking up is large. Therefore, 201216640 reduces the number of digital tuners that wake up simultaneously and reduces the power consumption of the broadcast system. In addition, the broadcast system does not need to continuously transmit the transmission streams demodulated by all digital tuners, thus saving the bandwidth required for the broadcast system. The same transport stream is broadcast to the desired clients by multicasting, so that it is not required to be broadcast repeatedly to save the bandwidth required by the broadcast system. The bandwidth of the broadcast system can be saved by stopping the broadcast transmission stream when the receiving client is idle. In addition, the power consumption of the broadcasting system can be saved by turning off the digital tuner when the receiving client is idle. The present invention will be clearly described in the following drawings and detailed description, and those skilled in the art will be able to change the teachings of the present invention. And modifications may be made without departing from the spirit and scope of the invention. Please refer to FIG. 1 , which is a functional block diagram of a broadcast system according to an embodiment of the present invention. The broadcast system wakes up one of the plurality of digital tuners upon receipt of the program request from the client to demodulate the transport stream containing the program requested by the client. The broadcast system 100 includes a plurality of digital tuners 111, 112, ..., 11n, a network transmission component 120, and a control component 130. Network transmission component 120 establishes a connection with a network 300. Among them, the network transmission component can be a wired or wireless network transmission component. The digital tuners 111, 112, ..., 11n can be digital television monitors, digital broadcast tuners or other types of digital tuners. The control component 130 is electrically coupled to each of the digital tuners 111, 112, . . . , 11n and the network transmission component 120. The 201216640 control element 13G includes a program request receiving module m and a batch wake-up module mq-streaming module 133. Program Requirements = The module 131 receives, via the network transmission component 120, at least the client 2U' on the network 300 receives a program request for a desired program. The tuner wake-up module 132 wakes up the digital tuner m, 112, /lln - and causes the awakened digital tuner to demodulate the group-transmitted stream according to the information to be received (Transp (m) , TS), wherein the 'demodulated transmission stream contains a plurality of selectable programs, and the program to be received is one of a plurality of selectable programs in the demodulated transmission stream. The stream broadcast module 133 Through the network transmission component 12, the broadcast transmission stream is streamed to the network, at least one client 211. Thus, since the digital tuner wakes up according to the program requirements, the number of digital tuner that wakes up simultaneously can be reduced. In addition, since the power consumption required for the digital tuner to wake up is large, reducing the number of digital tuners that wake up at the same time can reduce the power consumption of the broadcasting system 100. In addition, the broadcasting system 1 does not need to continuously transmit all digits. The transmission stream demodulated by the spectrometers m, 112, ..., Un, due to
此可節省廣播系統100所需之頻寬。 此外，在其他實施例中，要求同一欲收訊節目之客戶 端有複數個時，串流廣播模組133可藉由群播（multicast)， 將包含同一可選節目之被解調之傳輪串流廣播至客戶端。 串流廣播模組133可藉由將要求同—欲收訊節目之客戶端 分為同一群組，以進行群播。如此一來，藉由群播，可不 需重複廣播包含同-可選節目之被解調之傳輸串流，而節 省廣播系統100所需之頻寬。 在本揭露之一實施例中’廣播系統1〇〇可在客戶端211 201216640 閒置時，停止廣播傳輸串流。因此，控制元件130更可包 含一串流停止模組134。在自客戶端211接收一閒置訊號 時，串流停止模組134可使串流廣播模組133停止廣播該 組傳輸串流。其中，可使客戶端211執行一螢幕保護程式、 一省電模式或一關閉螢幕模式時，產生閒置訊號。如此一 來，可在客戶端211閒置時，藉由停止廣播傳輸串流，節 省廣播系統1〇〇之頻寬。 在本揭露之另一實施例中，廣播系統100可在客戶端 φ 211閒置時，關閉因應客戶端211之節目要求所喚醒之數位 調諧器。因此，控制元件130更可包含一調諧器關閉模組 135。在自客戶端211接收一閒置訊號時，調諧器關閉模組 135關閉因應客戶端211之節目要求而被喚醒之數位調諧 器。如此一來，可在客戶端211閒置時，藉由關閉數位調 諧器，節省廣播系統100之耗電功率。 此外，控制元件130更可包含一判斷模組136，用以 在自另一客戶端221接收用以要求另一欲收訊節目之另一 φ 節目要求指令時，判斷另一欲收訊節目是否為已解調之傳 輸串流之可選節目之其中之一。在另一欲收訊節目不為已 解調之傳輸串流之可選節目之其中之一時，調諧器喚醒模 組132喚醒數位調諧器111、112、...、11η中之另一數位 調諧器，並使被喚醒之另一數位調諧器，解調包含另一欲 收訊節目之另一組傳輸串流。串流廣播模組133透過網路 傳輸元件120,廣播另一組傳輸串流至另一客戶端221。此 外，在另一欲收訊節目為已解調之傳輸串流之可選節目之 其中之一時，控制元件130將另一客戶端221加入包含另 201216640 一欲收訊節目之傳輸串流之群播模組。如此一來，不需喚 醒另一數位調諧器，以提供另一欲收訊節目。此外，由於 包含另一欲收訊節目之傳輸串流係群播至另一客戶端 221，因此可進一步節省廣播系統100之頻寬。 請參照第2圖，其係依照本發明一實施方式的一種廣 播方法之流程圖。廣播方法應用於包含數個數位調諧器之 一廣播系統。在廣播方法中，在自客戶端收到節目要求時， 將多個數位調諧器的其中之一喚醒，以解調包含客戶端所 φ 要求節目之傳輸串流。廣播方法400包含以下步驟： 在步驟410中，自至少一客戶端，接收用以要求一欲 收訊節目之一節目要求指令。 在步驟420中，喚醒多個數位調諧器的其中之一。 在步驟430中，使被唤醒之數位調諧器根據欲收訊節 目之資訊，解調一組傳輸串流。其中，被解調之傳輸串流 包含數個可選節目，欲收訊節目為可選節目的其中之一。 在步驟440中，廣播傳輸串流至至少一客戶端。如此 • 一來，由於數位調諧器係因應節目要求而喚醒，因而可減 少同時喚醒之數位調諧器之個數。此外，由於數位調諧器 唤醒後所需之功率消耗較大。因此，減少同時喚醒之數位 調諧器之個數可降低功率消耗。另外，不需持續傳送所有 數位調諧器所解調出之傳輸串流，因可節省頻寬。 自多個客戶端接收到用以要求同一欲收訊節目之節目 要求（步驟410)時，可藉由群播，將包含同一可選節目 之被解調之傳輸串流廣播至客戶端（步驟440)。其中，可 藉由將要求同一欲收訊節目之客戶端分為同一群組，以進 201216640 行群播（步驟440)。如此一來，藉由群播，可不需重複廣 播包含同一可選節目之被解調之傳輸串流，而節省所需之 頻寬。 在本揭露之一實施例中，可在客戶端閒置時，停止廣 播傳輸串流。因此，廣播方法400更可包含：在自要求欲 收訊節目之至少一客戶端接收一閒置訊號（步驟450)時， 停止廣播傳輸串流（步驟460)。閒置訊號係在至少一客戶 端執行一螢幕保護程式、一省電模式或一關閉螢幕模式時 φ 產生。其中，可使至少一客戶端在執行一螢幕保護程式、 一省電模式或一關閉螢幕模式時，產生閒置訊號。此外， 亦可持續偵測至少一客戶端是否執行一螢幕保護程式、一 省電模式或一關閉螢幕模式，以判斷是否產生閒置訊號。 如此一來，可在客戶端閒置時，藉由停止廣播傳輸串流， 節省頻寬。 在本揭露之另一實施例中，可在客戶端閒置時，關閉 因應客戶端之節目要求所喚醒之數位調諧器。因此，廣播 φ 方法400更可包含：在自要求欲收訊節目之至少一客戶端 接收一閒置訊號（步驟450)時，關閉被喚醒之數位調諧 器（步驟470)。如此一來，可在客戶端閒置時，藉由關閉 數位調諧器，節省耗電功率。 此外，可藉由判斷其他客戶端所要求之節目是否包含 於已解掉之傳輸串流中，作為是否喚醒另一數位調諧器之 依據。因此，廣播方法400更可包含以下步驟： 在自另一客戶端接收用以要求另一欲收訊節目之另一 節目要求指令（步驟480)時，判斷另一欲收訊節目是否 201216640 為已解調之傳輸串流之可選節目之其中之一（步驟490)。 在步驟530中，在另一欲收訊節目為已解調之傳輸串 流之可選節目之其中之一時，廣播已解調之傳輸串流至另 一客戶端。如此一來，不需喚醒廣播系統之其他數位調諧 器，以提供另一欲收訊節目。於是，可節省廣播系統之耗 電。此外，包含另一欲收訊節目之傳輸串流可藉由群播， 而廣播至另一客戶端（步驟530)。因此，可進一步節省廣 播系統之頻寬。 • 在步驟500中，在另一欲收訊節目不為已解調之傳輸 串流之可選節目之其中之一時，喚醒廣播系統中之數位調 諧器中之另一數位調諧器。 在步驟510中，使被喚醒之另一數位調諧器，解調包 含另一欲收訊節目之另一組傳輸串流。 在步驟520中，廣播另一組傳輸串流至另一客戶端。 由上述本發明實施方式可知，應用本發明具有下列優 點。數位調諧器係因應節目要求而喚醒，因而可減少同時 • 喚醒之數位調諧器之個數。此外，由於數位調諧器喚醒後 所需之功率消耗較大。因此，減少同時喚醒之數位調諧器 之個數可降低廣播系統之功率消耗。另外，廣播系統不需 持續傳送所有數位調諧器所解調出之傳輸串流，因此可節 省廣播系統所需之頻寬。同一傳輸串流係藉由群播而廣播 至所需之各客戶端，因而不需重複被廣播，以節省廣播系 統所需之頻寬。可在收訊之客戶端閒置時，藉由停止廣播 傳輸串流，節省廣播系統之頻寬。此外，亦可在收訊之客 戶端閒置時，藉由關閉數位調諧器，節省廣播系統之耗電 [S] 11 201216640 功率。 雖然本發明已以實施方式揭露如上，然其並非用以限 定本發明，任何熟習此技藝者，在不脫離本發明之精神和 範圍内，當可作各種之更動與潤飾，因此本發明之保護範 圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之說明如下： 第1圖繪示依照本發明一實施方式的一種廣播系統之 功能方塊圖。 第2圖係依照本發明一實施方式的一種廣播方法之流 程圖。 【主要元件符號說明】 100 :廣播系統 111、112、...、11η : 數位調諧器 120 :網路傳輸元件 130 :控制元件 131 :節目要求接收模組 132 :調諧器喚醒模組 133 :串流廣播模組 134 :串流停止模組 135 :調諳器關閉模組 136 :判斷模組 211、221 :客戶端 300 :網路 400 :廣播方法 410〜530 :步驟 [s] 12This can save the bandwidth required by the broadcast system 100. In addition, in other embodiments, when there are multiple clients of the same intended program, the streaming broadcast module 133 may use a multicast to transmit the demodulated ship including the same optional program. Stream broadcast to the client. The streaming broadcast module 133 can perform the multicast by dividing the clients requesting the same program as the same group. In this way, by multicasting, it is possible to save the bandwidth required by the broadcasting system 100 without repeatedly broadcasting the demodulated transmission stream containing the same-optional program. In one embodiment of the present disclosure, the broadcast system 1 can stop the broadcast transport stream when the client 211 201216640 is idle. Therefore, the control component 130 can further include a stream stop module 134. Upon receiving an idle signal from the client 211, the streaming stop module 134 can cause the streaming broadcast module 133 to stop broadcasting the set of transport streams. The client 211 can generate an idle signal when performing a screen saver, a power save mode, or a screen off mode. In this way, the bandwidth of the broadcast system can be saved by stopping the broadcast transmission stream when the client 211 is idle. In another embodiment of the present disclosure, the broadcast system 100 can turn off the digital tuner waking up in response to the program request of the client 211 when the client φ 211 is idle. Therefore, the control component 130 can further include a tuner shutdown module 135. Upon receiving an idle signal from client 211, tuner off module 135 turns off the digital tuner that was woken up in response to the program request of client 211. In this way, the power consumption of the broadcasting system 100 can be saved by turning off the digital tuner when the client 211 is idle. In addition, the control component 130 further includes a determining module 136 for determining whether another program to be received is received when another φ program request command for requesting another program to be received is received from another client 221 One of the optional programs of the demodulated transmission stream. The tuner wake-up module 132 wakes up another digit of the digit tuner 111, 112, ..., 11n when another program to be received is not one of the selectable programs of the demodulated transmission stream. And causing another digital tuner to be awakened to demodulate another set of transmission streams containing another program to be received. The streaming broadcast module 133 broadcasts another set of transport streams to another client 221 via the network transport component 120. In addition, when another program to be received is one of the optional programs of the demodulated transmission stream, the control component 130 adds another client 221 to the group of transmission streams containing another 201216640 intended to receive the program. Broadcast module. In this way, there is no need to wake up another digital tuner to provide another program to be received. In addition, since the transmission stream containing another program to be broadcasted is multicast to another client 221, the bandwidth of the broadcasting system 100 can be further saved. Referring to Figure 2, there is shown a flow chart of a broadcast method in accordance with an embodiment of the present invention. The broadcast method is applied to a broadcast system including a plurality of digital tuners. In the broadcast method, upon receiving a program request from the client, one of the plurality of digit tuners is woken up to demodulate the transport stream containing the program requested by the client φ. The broadcast method 400 includes the following steps: In step 410, a program request instruction for requesting a program to be received is received from at least one client. In step 420, one of the plurality of digital tuners is woken up. In step 430, the awakened digital tuner demodulates a set of transmission streams based on the information of the program to be received. The demodulated transmission stream includes a plurality of optional programs, and the program to be received is one of the optional programs. In step 440, the broadcast transport stream is streamed to at least one client. In this way, since the digital tuner wakes up according to the program requirements, the number of digital tuners that wake up at the same time can be reduced. In addition, the power consumption required by the digital tuner after waking up is large. Therefore, reducing the number of digital tuners that wake up at the same time reduces power consumption. In addition, there is no need to continuously transmit the transmission stream demodulated by all digital tuners, since bandwidth can be saved. When a plurality of clients receive a program request for requesting the same desired program (step 410), the demodulated transmission stream containing the same optional program can be broadcast to the client by multicasting (step 440). Among them, the 201216640 line multicast can be entered by dividing the clients that require the same desired program into the same group (step 440). In this way, by multicasting, it is possible to save the required bandwidth without repeating the broadcast of the demodulated transport stream containing the same optional program. In one embodiment of the present disclosure, the broadcast transport stream can be stopped when the client is idle. Therefore, the broadcast method 400 can further include: stopping the broadcast transmission stream when the at least one client requesting the received program receives an idle signal (step 450) (step 460). The idle signal is generated when at least one client executes a screen saver, a power save mode, or a close screen mode. The at least one client can generate an idle signal when performing a screen saver, a power save mode, or a screen off mode. In addition, it is also possible to continuously detect whether at least one client executes a screen saver, a power save mode or a close screen mode to determine whether an idle signal is generated. In this way, bandwidth can be saved by stopping the broadcast transmission stream when the client is idle. In another embodiment of the present disclosure, the digital tuner awake in response to the client's program requirements can be turned off when the client is idle. Therefore, the broadcast φ method 400 can further include: turning off the awakened digital tuner when the at least one client requesting the received program receives an idle signal (step 450) (step 470). In this way, power consumption can be saved by turning off the digital tuner when the client is idle. In addition, it can be determined as to whether to wake up another digital tuner by judging whether the program requested by other clients is included in the decoded transmission stream. Therefore, the broadcast method 400 may further include the following steps: when receiving another program request instruction for requesting another program to be received from another client (step 480), determining whether another program to be received is 201216640 One of the optional programs of the demodulated transmission stream (step 490). In step 530, the demodulated transport stream is broadcast to another client when the other program to be received is one of the selectable programs of the demodulated transport stream. In this way, there is no need to wake up other digital tuners of the broadcast system to provide another program to be received. Thus, the power consumption of the broadcasting system can be saved. In addition, the transport stream containing another intended broadcast program can be broadcast to another client by multicast (step 530). Therefore, the bandwidth of the broadcast system can be further saved. • In step 500, another digitizer in the digital tuner in the broadcast system is woken up when another program to be received is not one of the selectable programs of the demodulated transmission stream. In step 510, another digital tuner that is woken up is demodulated to another set of transmission streams containing another program to be received. In step 520, another set of transport streams is broadcast to another client. It will be apparent from the above-described embodiments of the present invention that the application of the present invention has the following advantages. The digital tuner wakes up in response to program requirements, thus reducing the number of simultaneous waking digital tuners. In addition, the power consumption required by the digital tuner after waking up is large. Therefore, reducing the number of digital tuners that wake up simultaneously can reduce the power consumption of the broadcast system. In addition, the broadcast system does not need to continuously transmit the transmission stream demodulated by all digital tuners, thus saving the bandwidth required by the broadcasting system. The same transport stream is broadcast to the desired clients by multicasting, so there is no need to repeat the broadcast to save the bandwidth required by the broadcast system. The bandwidth of the broadcast system can be saved by stopping the broadcast transmission stream when the receiving client is idle. In addition, the power consumption of the broadcasting system can be saved by turning off the digital tuner when the receiving client is idle. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious, the description of the drawings is as follows: FIG. 1 is a diagram showing a broadcast according to an embodiment of the present invention. Functional block diagram of the system. Fig. 2 is a flow chart of a broadcasting method in accordance with an embodiment of the present invention. [Main component symbol description] 100: Broadcast system 111, 112, ..., 11n: Digital tuner 120: Network transmission component 130: Control component 131: Program request receiving module 132: Tuner wake-up module 133: String Streaming broadcast module 134: Streaming stop module 135: Tuner closing module 136: Judging module 211, 221: Client 300: Network 400: Broadcasting method 410~530: Step [s] 12