CN101521777B - DTV frequency channel switching method, DTV frequency channel switching system and DTV receiving terminal - Google Patents

DTV frequency channel switching method, DTV frequency channel switching system and DTV receiving terminal Download PDF

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CN101521777B
CN101521777B CN 200910106459 CN200910106459A CN101521777B CN 101521777 B CN101521777 B CN 101521777B CN 200910106459 CN200910106459 CN 200910106459 CN 200910106459 A CN200910106459 A CN 200910106459A CN 101521777 B CN101521777 B CN 101521777B
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frequency
audio
channel
corresponding
channel switching
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CN101521777A (en )
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叶新民
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深圳创维数字技术股份有限公司
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Abstract

The invention is applicable to the field of DTV and provides a DTV frequency channel switching method, a DTV frequency channel switching system and a DTV receiving terminal, wherein the frequency chanThe invention is applicable to the field of DTV and provides a DTV frequency channel switching method, a DTV frequency channel switching system and a DTV receiving terminal, wherein the frequency chanocessing three tasks serially, the invention optimizes the operating time of each link, saves the switching time on the whole and increases the speed of frequency channel switching by in parallel prococessing three tasks serially, the invention optimizes the operating time of each link, saves the switching time on the whole and increases the speed of frequency channel switching by in parallel processing of at least two of the tasks of fixing a new frequency point in frequency channel switching, obtaining the audio frequency and video PID and obtaining the control characters.essing of at least two of the tasks of fixing a new frequency point in frequency channel switching, obtaining the audio frequency and video PID and obtaining the control characters.nel switching method includes the following steps: A. receiving the instruction of frequency channel switching; B. fixing the corresponding frequency point of a target frequency channel when the targenel switching method includes the following steps: A. receiving the instruction of frequency channel switching; B. fixing the corresponding frequency point of a target frequency channel when the target frequency is not on the current frequency point; C. obtaining the audio frequency and video PID of the target frequency channel; D. obtaining control characters; and E. utilizing the control charactt frequency is not on the current frequency point; C. obtaining the audio frequency and video PID of the target frequency channel; D. obtaining control characters; and E. utilizing the control characters to arrange a descrambler so as to descramble the corresponding audio frequency and video data of the audio frequency and video PID and to display the descrambled audio frequency and video data. Thers to arrange a descrambler so as to descramble the corresponding audio frequency and video data of the audio frequency and video PID and to display the descrambled audio frequency and video data. The instruction of frequency channel switching indicates the target frequency channel, and at least two of the B, the C and the D steps are processed in parallel. Compared with the previous method of pre instruction of frequency channel switching indicates the target frequency channel, and at least two of the B, the C and the D steps are processed in parallel. Compared with the previous method of pr

Description

一种数字电视的频道切换方法、系统及数字电视接收终端 A digital television channel switching method, system and digital television reception terminal

技术领域 FIELD

[0001] 本发明属于数字电视领域,尤其涉及一种数字电视的频道切换方法、系统及数字电视接收终端。 [0001] The present invention belongs to the field of digital television, digital television particularly, to a channel switching method, system and a digital television receiving terminal.

背景技术 Background technique

[0002] 随着数字电视的推广,许多家庭已经使用数字电视接收终端来收看数字电视。 [0002] With the promotion of digital TV, many families have used digital television receiving terminal to watch digital TV. 频道切换速度一直是检验数字电视接收终端的重要指标,也直接影响用户对数字电视接收终端的好感度。 Channel switching speed has been an important indicator examines the digital television receiving terminal, but also directly affect the user favorability digital television receiving terminal.

[0003] 目前,数字电视接收终端采用的频道切换方法是:在接收到频道切换指令时,首先,根据频道切换指令指示的目标频道,确定该目标频道所在的频点,当该目标频道所在的频点不为当前频点时,则调谐到新的频点。 [0003] Currently, digital television reception channel switching method of a terminal used is: when receiving a channel switching instruction, first, according to the channel switching destination channel indicated by the instruction, determining frequency of the target channel is located, when the channel where the goal frequency point is not the current frequency, the tuning to the new frequency. 接着,获取目标频道的音视频分组标号(Packet identifier,PID) „ 然后,需要发送授权控制信息(Entitlement Control Message,ECM)及授权管理信息(Entitlement ManagerMessage,EMM)给智能卡,智能卡反馈控制字(Control Word,CW)。这样,就可以利用控制字设置解扰器,以对音视频数据进行解扰。最后,通过调用音视频显示函数就可以播放目标频道的电视节目。 Then, get audio and video packet label target channel (Packet identifier, PID) "Then, you need to send an authorization control information (Entitlement Control Message, ECM) and Entitlement Management Message (Entitlement ManagerMessage, EMM) to the smart card, smart card feedback control word (Control word, CW). in this way, you can use the control word is set descrambler to descramble the audio and video data. Finally, by calling the audio and video display functions can play target television channels.

[0004] 在上述频道切换的过程中,锁定新的频点,获取音视频PID,获取控制字的过程都较为消耗时间,并且这三个处理过程为串行的处理方式,因此消耗的时间会进行叠加,从而导致数字电视接收终端频道切换的速度较慢(同频点下2秒左右,在异频点下2. 5秒左右)。 [0004] In the above-mentioned channel switching procedure, the new locking frequency, obtaining the PID of audio and video, control word acquisition process are relatively time consuming process and the three serial processing mode, time consuming and therefore will superimposed, resulting in digital television receiving terminal speed channel switching is slow (at the same frequency point approximately 2 seconds in the inter-frequency point approximately 2.5 seconds).

发明内容 SUMMARY

[0005] 本发明的目的在于提供一种数字电视的频道切换方法,旨在解决在现有的数字电视的频道切换方法中,频道切换的速度较慢的问题。 [0005] The object of the present invention to provide a digital television channel switching method, to solve the conventional digital television channel switching method, the channel switching speed is slow problem.

[0006] 本发明是这样实现的,一种数字电视的频道切换方法,所述频道切换方法包括以下步骤: [0006] The present invention is implemented, a digital television channel switching method, the channel switching method comprising the steps of:

[0007] A、接收频道切换指令; [0007] A, receiving the channel switching instruction;

[0008] B、当目标频道不在当前频点时,锁定目标频道对应频点; [0008] B, when the current frequency is not the target channel, targeted frequency corresponding to the channel;

[0009] C、获取目标频道的音视频PID ; [0009] C, to obtain audio and video PID target channels;

[0010] D、获取控制字; [0010] D, acquisition control word;

[0011] E、利用控制字设置解扰器对所述音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据,在利用控制字设置解扰器时,造一个EMM表和ECM表,将它们发送给控制字管理进程,控制字管理进程收到数据后,将其发给智能卡,忽略掉智能卡的返回值, 直接利用上一个控制字来设置解扰器, [0011] E, provided by the control word to the descrambler audio and video PID corresponding descrambling audio and video data, audio data and plays the video descrambling, control words when the descrambler is provided, making an EMM ECM table and the table, they will be sent to the control word management processes, control word management process after receiving the data, it issued a smart card, smart card ignore the return value of a control word to set the descrambler on the direct use,

[0012] 所述频道切换指令指示了目标频道,所述B、C、D步骤中的至少有2个步骤为并行处理。 [0012] The channel switching instruction indicates the target channel, the B, C, there are at least two steps in the parallel processing in step D.

[0013] 本发明的另一目的在于提供一种数字电视的频道切换系统,所述系统包括:接收单元,用于接收频道切换指令,所述频道切换指令指示了目标频道; [0013] Another object of the present invention is to provide a digital television channel switching, the system comprising: a receiving unit configured to receive a channel switching command, the channel switching instruction indicating the target channel;

[0015] 锁频单元,用于当目标频道不在当前频点时,锁定目标频道对应频点; [0015] frequency locking unit for, when the target is not the current frequency channel, targeted frequency corresponding to the channel;

[0016] 音视频PID获取单元,用于获取目标频道的音视频PID ; [0016] audio and video PID acquisition unit for acquiring video and audio PID target channel;

[0017] 控制字获取播放单元,用于获取控制字; [0017] The playback control word acquisition unit, configured to obtain the control word;

[0018] 音视频解扰单元,用于利用控制字设置解扰器对所述音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据,在利用控制字设置解扰器时,造一个EMM表和ECM表,将它们发送给控制字管理进程,控制字管理进程收到数据后,将其发给智能卡,忽略掉智能卡的返回值,直接利用上一个控制字来设置解扰器, [0018] The descrambling unit audio and video, the audio and video PID for audio and video data corresponding to descrambling control words provided descrambler, and play audio and video data descrambled in the descrambling control words provided when the device, after making a EMM table and ECM table, send them to the control word management processes, control word management process receives the data, it is sent to the smart card, ignored the smart card return value, the direct use of a control word to set descrambler,

[0019] 所述锁频单元、音视频PID获取单元、控制字获取单元中的至少2个为并行处理。 [0019] The locked units, audio and video PID acquisition unit acquires at least two control words for parallel processing units.

[0020] 本发明的另一目的在于提供一种数字电视接收终端,所述数字电视接收终端包括数字电视的频道切换系统,所述系统包括: [0020] Another object of the present invention is to provide a digital television receiving terminal, the digital television receiving terminal includes a digital television channel switching, the system comprising:

[0021] 频道切换指令接收单元,用于接收频道切换指令,所述频道切换指令指示了目标频道; [0021] The channel switching instruction receiving means for receiving a channel switching instruction, the channel switching instruction indicating the target channel;

[0022] 锁频单元,用于当目标频道不在当前频点时,锁定目标频道对应频点; [0022] frequency locking unit for, when the target is not the current frequency channel, targeted frequency corresponding to the channel;

[0023] 音视频PID获取单元,用于获取目标频道的音视频PID ; [0023] audio and video PID acquisition unit for acquiring video and audio PID target channel;

[0024] 控制字获取单元,用于获取控制字; [0024] The control word acquisition unit, configured to obtain the control word;

[0025] 音视频解扰播放单元,用于利用控制字设置解扰器对所述音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据,在利用控制字设置解扰器时,造一个EMM表和ECM表,将它们发送给控制字管理进程,控制字管理进程收到数据后,将其发给智能卡, 忽略掉智能卡的返回值,直接利用上一个控制字来设置解扰器, [0025] descrambling audio and video playback unit, is provided for control words to the descrambler PID corresponding to the audio-video descrambling audio and video data, and plays audio and video data descrambled, the solution provided by the control word when the scrambler, after making a EMM table and ECM table, send them to the control word management processes, control word management process receives the data, it is sent to the smart card, ignored the smart card return value of a control word on the direct use set descrambler,

[0026] 所述锁频单元、音视频PID获取单元、控制字获取单元中的至少2个为并行处理。 [0026] The locked units, audio and video PID acquisition unit acquires at least two control words for parallel processing units.

[0027] 在本发明中,通过对频道切换中锁定新频点的任务、获取音视频PID的任务、获取控制字的任务中的至少两个任务进行并行处理,较以往三个任务的串行处理,节省了切换时间,提高了频道切换速度。 [0027] In the present invention, by the locking of the tasks of the new channel frequency handoff, access to audio and video PID task, the task of obtaining a control word in at least two parallel processing tasks, than the conventional three serial tasks processing, saving the switching time, the channel switching speed is improved.

附图说明 BRIEF DESCRIPTION

[0028] 图1是本发明提供的数字电视的频道切换方法的实施流程图; [0028] FIG. 1 is a flowchart illustrating a channel switching method of the embodiment of the present invention provides a digital television;

[0029] 图2是本发明提供的数字电视的频道切换系统的结构示意图。 [0029] FIG. 2 is a schematic structural diagram of the present invention provides a digital TV channel switching system.

具体实施方式 detailed description

[0030] 为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。 [0030] To make the objectives, technical solutions and advantages of the present invention will become more apparent hereinafter in conjunction with the accompanying drawings and embodiments of the present invention will be further described in detail. 应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。 It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention.

[0031] 在本发明中,通过对频道切换中锁定新频点的任务、获取音视频PID的任务、获取控制字的任务中的至少两个任务进行并行处理,较以往三个任务的串行处理,节省了切换时间,提高了频道切换速度。 [0031] In the present invention, by the locking of the tasks of the new channel frequency handoff, access to audio and video PID task, the task of obtaining a control word in at least two parallel processing tasks, than the conventional three serial tasks processing, saving the switching time, the channel switching speed is improved.

[0032] 图1示出了本发明提供的数字电视的频道切换方法的流程,详述如下: [0032] FIG. 1 shows a flow of the digital television channel switching method of the present invention provides, as detailed below:

[0033] 在步骤SlOl中,接收频道切换指令。 [0033] In step SlOl, the reception channel switching instruction.

5[0034] 用户需要频道切换时,可以通过遥控器或数字电视接收终端上的控制按键发出频道切换指令。 5 [0034] The user needs to switch the channel, the channel can switch instruction issued by the control buttons on the remote control or digital television receiving terminal. 通常,频道切换指令中会携带有频道编号,以指示目标频道。 Typically, the channel switching instruction will carry the channel number to indicate the destination channel.

[0035] 在步骤S102中,处理锁定新频点的任务、获取音视频PID的任务、获取控制字的任务,并且三个任务中的至少两个采用并行处理的方式。 [0035] In step S102, the processing tasks of the new locking frequency, the audio and video PID acquired task, the task of obtaining a control word, and at least two parallel processing using three tasks.

[0036] 锁定新频点的过程可以为:确定频道切换指令指示的目标频道所在的频点,再判断该目标频道所在的频点是否为当前频点,当不为当前频点时,则调谐到目标频道所在的频点。 [0036] Lock new frequency procedure may include: determining frequency channel switching instruction indicating the target channel is located, and then determines frequency of the target channel is located is the current frequency point, when no current frequency, the tuner frequency channel to the target is located.

[0037] 在调谐到该目标频道所在的频点的过程中,由于各个频点的信号强度,频谱相位等参数可能不同。 [0037] In tuning to the target frequency channel is located in the process, since the signal strength and other parameters of each phase spectrum of frequencies may be different. 于是,Demod芯片需要重新调整各种锁频相关参数(如自动增益控制(Automatic Gain Control, AGC)、FEC、频偏、符号率偏差、频谱相位等),来设置内部寄存器,以实现锁定新频点。 Thus, the chip Demod locked readjust various parameters (e.g., AGC (Automatic Gain Control, AGC), FEC, frequency offset, symbol rate deviation, the phase spectrum, etc.), to set the internal registers to implement the new locking frequency point. 由于调整各种锁频相关参数所需的时间可能较长,就可能导致锁定新频点的时间较长。 Because of the time required to adjust various parameters related to frequency lock may be longer, it could lead to a longer lock the new frequency point of time. 为了缩短锁定新频点的时间,作为本发明的实施例,可以将频点对应的锁频相关参数值进行保存,当需要锁定新频点时,根据存储器中的该新频点对应的锁频相关参数值,就可以锁定新频点。 In order to shorten the time of locking the new frequency, as an embodiment of the present invention, may be locked related parameter value corresponding to the frequency point to save, when a new frequency needs to be locked, corresponding to the locked frequency according to the new memory relevant parameters, you can lock the new frequency.

[0038] 在实施的过程中,可以在锁定某频点时,将在该频点下Demod的内部寄存器的相关参数值存储到闪存Flash中,在下次重新切换到该频点的节目时,就可以利用存储的相关参数值设入Demod,从而可以快速锁定该频点。 When [0038] In the process embodiment, the correlation parameter values ​​stored may be locked in a frequency point, the Demod at the frequency of internal registers in the flash memory Flash, the next re-switching to program the frequency, it is relevant parameters may be utilized to store the set values ​​Demod, which can quickly lock the frequency. 当然,如果使用存储的相关参数锁定新频点失败,由Demod芯片重新调整各种锁频相关参数,以锁定新频点,并在存储器中更新相应的频点对应的相关参数值。 Of course, if the stored parameter related to the new frequency lock fails, re-adjusting the various chips Demod locked parameters, to lock the new frequency, and updates the corresponding value of the correlation parameter corresponding to frequency point in the memory.

[0039] 在获取目标频道的音视频PID时,根据目标频道的频道编号,即可搜索到该目标频道对应的音视频PID。 [0039] When obtaining audio and video PID target channel, according to the channel number of the destination channel, you can search for audio and video PID of the target corresponding to the channel. 虽然各频道一般对应有固定的音视频PID,但是需要经过好几级数据过滤才会获得当前节目的音视频PID,为了缩短获取音视频PID的时间,作为本发明的实施例,可以存储频道对应的音视频PID,当进行频道切换时,就可以调取目标频道对应的音视频PID。 Although generally corresponding to respective channels have a fixed PID of audio and video, but the need to go through several stages until the filter data obtained in the audio and video PID of the current program, in order to shorten the time to acquire the PID of audio and video, as an embodiment of the present invention may be stored corresponding to the channel audio and video PID, when the channel switching, can be retrieved audio and video PID corresponding to the target channel.

[0040] 在获取控制字时,先获取ECM和EMM,然后将ECM和EMM传递给智能卡,智能卡验证通过后,反馈控制字。 [0040] When obtaining a control word, to obtain the ECM and EMM, and the EMM and passes the ECM to the smartcard, smart card authentication is passed, the feedback control word. 由于在控制字传输的过程中,必须进行多次的加解密,影响频道切换的速度。 Since the control word during transmission, encryption and decryption must be performed several times, the influence of the channel switching speed. 而在单一用户观看节目时,某个节目的控制字在一定时间内会保持不变,作为本发明的实施例,可以将频道的节目的控制字进行保存,当再次切换到该频道时,就可以调取控制字。 And when a single user watching a program, a program control word will remain unchanged over time, as an embodiment of the present invention, the control program of a channel word can be saved when switching to the channel again, it control word can be retrieved. 为了避免智能卡验证花费较长时间,可以仿造一个EMM表和ECM表,将它们发送给控制字管理进程。 To prevent smart card authentication takes a long time, you can fake a table EMM and ECM table, sending them to the control word management process. 控制字管理进程收到数据后,将其发给智能卡,忽略掉智能卡的返回值, 直接利用上一个CW来设置解扰器。 After receiving the data management process control word, it issued a smart card, smart card ignore the return value of a CW is set directly on the descrambler.

[0041 ] 在步骤S103中,利用控制字设置解扰器对该音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据。 [0041] In step S103, the control word is set by using the descrambler descrambles audio and video PID corresponding to the audio and video data, and plays audio and video data descrambled.

[0042] 在步骤S104中,播放解扰后的音视频数据。 [0042] In step S104, playback of audio and video data descrambled.

[0043] 图2示出了本发明提供的数字电视的频道切换系统的结构,该数字电视的频道切换系统可以为内置于数字电视接收终端的软件单元或者硬件单元或者软、硬结合的单元。 [0043] FIG. 2 shows the structure of a digital television channel switching system provided by the invention, the digital TV channel switching system may be built in the digital television receiving terminal software units or hardware unit or a software unit hard bound.

[0044] 该数字电视的频道切换系统包括频道切换指令接收单元21、锁频单元22、音视频PID获取单元23、控制字获取单元24、及音视频解扰单元25。 [0044] The digital television channel switching system comprises a channel switching instruction receiving unit 21, a frequency-locked unit 22, audio and video PID acquisition unit 23, control word acquisition unit 24, video and audio descrambling unit 25.

[0045] 频道切换指令接收单元21接收频道切换指令,该频道切换指令指示了目标频道。 [0045] The channel switching instruction receiving unit 21 receives a channel switch command, the channel switching instruction indicating the destination channels. 当目标频道不在当前频点时,锁频单元22锁定目标频道所在的频点。 When the target channel is not the current frequency point, the locking unit 22 is locked frequency channel where the goal. 音视频PID获取单元23获取目标频道的音视频PID,控制字获取单元24获取控制字,音视频解扰单元25利用控制字设置解扰器对该音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据。 Audio and video acquisition unit 23 acquires the PID of audio and video PID target channel, control word acquisition control word acquisition unit 24, audio and video descrambling unit 25 is provided with a control word to the descrambler descrambles audio and video PID corresponding to the audio and video data, and play audio and video data after descrambling. 该锁频单元22、音视频PID获取单元23、控制字获取单元24中的至少2个为并行处理(图中仅示出3个单元进行并行处理的情形)。 The locked unit 22, audio and video PID acquisition unit 23, acquires the control word in at least two parallel processing unit 24 (FIG. 3 shows only the case of parallel processing units).

[0046] 锁频单元22锁定目标频道所在的频点的过程为:频点确定模块221确定目标频道对应的频点,频点判断模块222判断该对应的频点是否为当前频点,当不为当前频点时,对应频点锁定模块223根据事先保存的频点对应的锁频相关参数值,锁定该对应的频点。 [0046] The locking unit 22 is locked frequency channel where the goal is a process: a frequency determining module 221 determines a target point corresponding to the channel frequency, frequency determining module 222 determines whether the frequency corresponding to the current frequency point, when no when the current frequency, the corresponding frequency point locking module 223 according to frequency lock related parameter value stored in advance corresponding to the frequency, the corresponding frequency lock point.

[0047] 为了缩短获取音视频PID的时间,作为本发明的实施例,可以在该频道切换系统中增加音视频PID存储模块27,音视频PID存储模块27存储目标频道对应的音视频PID。 [0047] In order to shorten the time to acquire the PID of audio and video, as an embodiment of the present invention, can increase the audio and video PID storing module 27 in the channel switching system, the audio and video PID storing module 27 stores target channel corresponding to the audio and video PID. 当再次切换到该目标频道时,就可以直接调用该存储的音视频PID,从而加快了频道切换的速度。 When switching again to the target channel, you can directly call the stored audio and video PID, thereby speeding up the channel switching.

[0048] 为了缩短获取控制字的时间,作为本发明的实施例,可以在该频道切换系统中增加控制字存储模块28,控制字存储模块28存储控制字。 [0048] In order to shorten the time of obtaining a control word as an embodiment of the present invention, the control word in the memory module 28 of the channel switching system, the control word stored in control word storage module 28. 当再次切换到该目标频道时,就可以直接调用该存储的控制字来设置解扰器,从而加快了频道切换的速度。 When the target channel is switched again, you can directly call the stored control words to the descrambler is provided, thereby speeding up the channel switching.

[0049] 综上所述,通过对频道切换中锁定新频点的任务、获取音视频PID的任务、获取控制字的任务中的至少两个任务进行并行处理,较以往三个任务的串行处理,节省了切换时间,提高了频道切换速度。 [0049] In summary, the new task by frequency locking to the channel switching, the audio and video PID acquired task, the task of obtaining a control word in at least two parallel processing tasks, than the conventional three serial tasks processing, saving the switching time, the channel switching speed is improved. 并且,通过存储频点对应的锁频相关参数值、频道对应的音视频PID、控制字,在切换到目标频道时,就可以迅速锁定目标频道所在的频点、获取频道对应的音视频PID、控制字,从而进一步提高了频道切换速度。 And, locked by storing related parameter value corresponding to the point frequency, the channel corresponding to the PID of audio and video, control words, when switching to the destination channel, can quickly lock the frequency where the target channel, obtaining the PID of audio and video corresponding to the channel, control word, thereby further improving the channel switching speed.

[0050] 以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。 [0050] The foregoing is only preferred embodiments of the present invention but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, equivalent substitutions and improvements should be included in the present within the scope of the invention.

7 7

Claims (10)

  1. 一种数字电视的频道切换方法,其特征在于,所述频道切换方法包括以下步骤:A、接收频道切换指令;B、当目标频道不在当前频点时,锁定目标频道对应频点;C、获取目标频道的音视频PID;D、获取控制字;E、利用控制字设置解扰器对所述音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据,在利用控制字设置解扰器时,造一个EMM表和ECM表,将它们发送给控制字管理进程,控制字管理进程收到数据后,将其发给智能卡,忽略掉智能卡的返回值,直接利用上一个控制字来设置解扰器,所述频道切换指令指示了目标频道,所述B、C、D步骤中的至少有2个步骤为并行处理。 Channel switching method for a digital television, wherein said channel switching method comprising the steps of: A, receiving a channel switching instruction; B, when the target channel is not the current frequency point, the frequency corresponding to the channel targeted point; C, obtaining audio and video PID target channel; D, obtaining a control word; E, provided by the control word to the descrambler audio and video PID corresponding descrambling audio and video data, and plays audio and video data is descrambled, using the control after setting when word descrambler, create a table EMM and ECM table, send them to the control word management process, management process control word data is received, it issued a smart card, smart card ignore the return value, the direct use of a control word to the descrambler is provided, the channel switching instruction indicates the target channel, the B, C, D there is the step of at least two parallel processing steps.
  2. 2.如权利要求1所述的方法,其特征在于,所述步骤B还包括以下步骤: Bi、确定目标频道对应的频点;B2、判断所述对应的频点是否为当前频点;B3、当不为当前频点时,根据事先保存的频点对应的锁频相关参数值,锁定所述对应的频点。 2. The method according to claim 1, wherein said step B further comprises the step of: Bi, determining a target frequency corresponding to the channel; B2, determining whether the frequency corresponding to the current frequency; B3 when the current frequency point is not, locked according related parameter value stored in advance corresponding to the frequency, of the frequency corresponding to the lock.
  3. 3.如权利要求1所述的方法,其特征在于,所述方法还包括以下步骤:G、存储目标频道对应的音视频PID。 The method according to claim 1, wherein said method further comprises the step of: audio and video PID G, storage destinations corresponding to the channel.
  4. 4.如权利要求1所述的方法,其特征在于,所述方法还包括以下步骤:H、存储控制字。 4. The method according to claim 1, wherein said method further comprises the step of: H, storage control word.
  5. 5. 一种数字电视的频道切换系统,其特征在于,所述系统包括:频道切换指令接收单元,用于接收频道切换指令,所述频道切换指令指示了目标频道;锁频单元,用于当目标频道不在当前频点时,锁定目标频道对应频点; 音视频PID获取单元,用于获取目标频道的音视频PID ; 控制字获取单元,用于获取控制字;以及音视频解扰播放单元,用于利用控制字设置解扰器对所述音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据,在利用控制字设置解扰器时,造一个EMM表和ECM表,将它们发送给控制字管理进程,控制字管理进程收到数据后,将其发给智能卡,忽略掉智能卡的返回值,直接利用上一个控制字来设置解扰器,所述锁频单元、音视频PID获取单元、控制字获取单元中的至少2个为并行处理。 A channel switching system of a digital television, which is characterized in that, the system comprising: a channel switching instruction receiving means for receiving a channel switching instruction, the channel switching instruction indicating the destination channel; frequency locking unit for, when when this is not the destination channel frequency, a frequency corresponding to a channel targeted point; audio and video PID acquisition unit for acquiring video and audio PID target channel; control word acquisition unit, configured to obtain the control word; and descrambling audio and video playback units, a descrambler provided by the control word for the audio and video PID corresponding descrambling audio and video data, and plays audio and video data descrambled, when the control word is set descrambler, create a table EMM and ECM after the table, send them to the management process control word, the control word management process receives data which was sent to the smart card, the smart card ignore the return value, a control word is provided directly on the descrambler, the locked unit , audio and video PID acquisition unit acquires at least two control words for parallel processing units.
  6. 6.如权利要求5所述的系统,其特征在于,所述锁频单元又包括: 频点确定模块,用于确定目标频道对应的频点;频点判断模块,用于判断所述对应的频点是否为当前频点;以及对应频点锁定模块,用于当不为当前频点时,根据事先保存的频点对应的锁频相关参数值,锁定所述对应的频点。 6. The system of claim 5, wherein said frequency lock unit in turn comprising: frequency determining means for determining a target frequency corresponding to the channel; frequency determination means for determining the corresponding whether the current frequency point frequency; and the corresponding frequency point locking module, configured to, when the current frequency point is not, locked according related parameter value stored in advance corresponding to the frequency, of the frequency corresponding to the lock.
  7. 7.如权利要求5所述的系统,其特征在于,所述系统还包括: 音视频PID存储模块,用于存储目标频道对应的音视频PID。 7. The system according to claim 5, characterized in that the system further comprises: audio and video PID storing means for storing the audio and video PID corresponding to the target channel.
  8. 8.如权利要求5所述的系统,其特征在于,所述系统还包括: 控制字存储模块,用于存储控制字。 The system as claimed in claim 5, characterized in that the system further comprises: a control word storage module for storing control words. 2 2
  9. 9. 一种数字电视接收终端,其特征在于,所述数字电视接收终端包括数字电视的频道切换系统,所述系统包括:频道切换指令接收单元,用于接收频道切换指令,所述频道切换指令指示了目标频道;锁频单元,用于当目标频道不在当前频点时,锁定目标频道对应频点; 音视频PID获取单元,用于获取目标频道的音视频PID ; 控制字获取单元,用于获取控制字;以及音视频解扰播放单元,用于利用控制字设置解扰器对所述音视频PID对应的音视频数据进行解扰,并播放解扰后的音视频数据,在利用控制字设置解扰器时,造一个EMM表和ECM表,将它们发送给控制字管理进程,控制字管理进程收到数据后,将其发给智能卡,忽略掉智能卡的返回值,直接利用上一个控制字来设置解扰器,所述锁频单元、音视频PID获取单元、控制字获取单元中的至少2个为并行处理 A digital television receiving terminal, wherein the digital television receiving terminal includes a digital television channel switching, the system comprising: a channel switching instruction receiving means for receiving a channel switching instruction, the channel switching instruction indicating the target channel; frequency locking unit for, when the target channel is not the current frequency point, the frequency corresponding to the channel targeted point; audio and video PID acquisition unit for acquiring video and audio PID target channel; control word acquisition unit for obtaining a control word; and descrambling audio and video playback unit, is provided for control words to the descrambler PID corresponding to the audio-video descrambling audio and video data, and plays audio and video data is descrambled, using the control word when setting descrambler, create a table EMM and ECM table, send them to the control word management process, management process control word data is received, it issued a smart card, smart card ignore the return value of a control on the direct use descrambler word set, the locked unit, audio and video PID acquisition unit acquires at least two control words for parallel processing units .
  10. 10.如权利要求9所述的终端,其特征在于,所述锁频单元又包括: 频点确定模块,用于确定目标频道对应的频点;频点判断模块,用于判断所述对应的频点是否为当前频点;以及对应频点锁定模块,用于当不为当前频点时,根据事先保存的频点对应的锁频相关参数值,锁定所述对应的频点。 10. The terminal according to claim 9, wherein said locked means further comprising: frequency determining means for determining a target frequency corresponding to the channel; frequency determination means for determining the corresponding whether the current frequency point frequency; and the corresponding frequency point locking module, configured to, when the current frequency point is not, locked according related parameter value stored in advance corresponding to the frequency, of the frequency corresponding to the lock.
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