WO2017161737A1 - 一种电视模拟信号解调方法和装置 - Google Patents

一种电视模拟信号解调方法和装置 Download PDF

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WO2017161737A1
WO2017161737A1 PCT/CN2016/088359 CN2016088359W WO2017161737A1 WO 2017161737 A1 WO2017161737 A1 WO 2017161737A1 CN 2016088359 W CN2016088359 W CN 2016088359W WO 2017161737 A1 WO2017161737 A1 WO 2017161737A1
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signal
digital
analog
television
analog signal
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French (fr)
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薛金升
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Le Holdings Beijing Co Ltd
Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Le Holdings Beijing Co Ltd
Leshi Zhixin Electronic Technology Tianjin Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits

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  • the embodiments of the present invention relate to the technical field of television chips, and in particular, to a television analog signal demodulation method and apparatus.
  • Qualcomm is a typical representative of the performance of mobile phone processors.
  • smart TVs the same system running Android, Qualcomm has entered the TV chip industry, and many manufacturers choose Qualcomm as a platform, but so far, Qualcomm platform itself does not support the modulation of RF signals.
  • the crux of the problem is that the current USB (Universal Serial Bus) bridge can handle the digital code stream, and can also be converted into a USB signal for the main IC (Integrated Circuit) processing. Therefore, the existing improvement scheme usually adopts the method of adding an external tuner+demo to perform modulation and demodulation, and demodulates the signal and converts it into a USB signal through a chip to the main IC for processing.
  • analog signals such as CVBS (Composite Video Broadcast Signal)
  • the CVBS is a widely used standard, also called baseband video, which transmits data in analog waveforms.
  • the composite video contains chromatic aberrations (hues). And saturation) and brightness (bright) information, and synchronize them in the blanking pulse, using the same signal.
  • the embodiment of the present application provides a television analog signal demodulation method and apparatus, which can process a video signal in the form of an analog signal, thereby completely or partially overcoming the defects that the prior art can only support digital signal processing.
  • the embodiment of the present application provides a television analog signal demodulation apparatus, including:
  • a radio frequency receiving module configured to receive a video signal, where the video signal is an analog signal
  • An AD chip configured to convert the analog signal into a digital signal by analog-to-digital conversion processing, and transmit the digital signal in a digital TS stream;
  • USB bridge configured to convert the digital TS stream to a USB signal
  • the main IC is configured to process the USB signal.
  • the embodiment of the present application provides a television analog signal demodulation method, including:
  • the television analog signal demodulation method and device provided by the embodiments of the present application are processed into a corresponding TS stream through a TV tuner, a modem, and an AD chip after all analog signals are input, and the TS stream is converted into a USB bridge by analog-to-digital conversion.
  • the digital signal that can be processed that is, by converting the input analog signal into a digital signal and then processing the IC, solves the drawbacks of the prior art that the analog signal cannot be processed.
  • FIG. 1 is a schematic structural diagram of a television analog signal demodulating apparatus according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of converting a radio frequency signal to an intermediate frequency signal in an embodiment of the present application
  • FIG. 3 is a schematic diagram of a TS packet in a specific embodiment of the present application.
  • FIG. 4 is a schematic diagram of TS flow formation in a specific embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a television analog signal demodulating apparatus when an analog signal is a CVBS signal according to an embodiment of the present application;
  • FIG. 6 is a schematic flow chart of a television analog signal demodulation method in a specific embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a television analog signal demodulating apparatus according to an embodiment of the present application. As shown in FIG. 1, the apparatus includes:
  • the radio frequency receiving module is configured to receive a video signal, where the video signal is an analog signal.
  • the radio frequency receiving module receives the video signal in a wired transmission or a wireless transmission manner, and the video signal is an analog signal.
  • the analog signal refers to information represented by a continuously varying physical quantity whose amplitude, or frequency, or phase of the signal changes continuously with time, such as a currently broadcasted sound signal, or an image signal.
  • the RF receiving module modulates the analog signal into a radio frequency signal (RF signal) and sends it to the TV tuner.
  • RF signal radio frequency signal
  • the television tuner is configured to receive the radio frequency signal transmitted by the radio frequency receiving module, and convert the radio frequency signal into an intermediate frequency signal and send the signal to the modem.
  • the TV tuner may be a Tuner chip, and the Tuner chip receives the radio frequency signal transmitted from the radio frequency receiving module, and converts the radio frequency signal into an intermediate frequency signal.
  • the method of converting the RF signal to the IF signal can be based on:
  • IF is the intermediate frequency signal output from the TV tuner
  • Fo is the local oscillation signal
  • Fs is the input RF signal.
  • the modem is configured to receive the intermediate frequency signal transmitted by the television tuner, and transmit and modulate the intermediate frequency signal to the AD chip.
  • the modulation converts the digital baseband signal into a digitally modulated signal suitable for channel transmission, and the received digital frequency band signal is reduced to a digital baseband signal at the receiving end.
  • the modem demodulates the intermediate frequency signal, converts it to baseband, and decodes the encoded signal of the baseband.
  • the AD chip is configured to convert the modulated intermediate frequency signal into a digital signal through AD conversion processing, and transmit the digital signal to the USB bridge in the form of a digital TS (Transport Stream).
  • a digital TS Transport Stream
  • the AD conversion is analog-to-digital conversion.
  • the modulated intermediate frequency signal is converted into a digital signal, and the digital signal converted by the AD chip is transmitted to the USB bridge in the form of a digital TS stream.
  • the TS packet is divided into a link header, an adaptation field, and a payload according to functions, wherein the length of the link header is fixed to 4 bytes, and the length of the adaptation field is variable from 0 bytes to 184 bytes.
  • the length of the payload data is variable from 0 bytes to 184 bytes.
  • the TS stream is formed by a periodic arrangement of a number of TS packets of length 188 bytes.
  • the TS stream generation process is as shown in FIG. 4.
  • the video ES and the audio ES form a PES through a packetizer and a common or independent system time reference, and the formed transport stream is multiplexed by a TS multiplexer, where the ES stream (Elementary Stream) ) is a continuous code stream of basic code stream, audio, video or other information that is not segmented; PES (Program Elementary Stream) stream is a package basic that divides the elementary stream ES into segments and adds the corresponding header files.
  • the code stream; then the TS stream is a single data stream that combines one or more PESs with a common time reference or an independent time reference.
  • the USB bridge is configured to receive the digital TS stream from the AD chip and convert the digital TS stream to a USB signal for transmission to the host IC.
  • the USB bridge can process the digital code stream, convert the digital TS stream to a USB signal after receiving the digital TS stream, and then transmit the USB signal to the main IC for processing.
  • analog signals cannot be processed.
  • the TV tuner, the modem, and the AD chip are processed into corresponding TS streams, and the TS stream is subjected to analog-to-digital conversion to become a digital signal that can be processed by the USB bridge. That is to say, by converting the input analog signal into a digital signal and then processing the IC, the drawbacks of the prior art that the analog signal cannot be processed are solved.
  • I2C bus Inter-IC bus
  • the I2C bus is a bidirectional two-wire continuous bus that uses a data line (SDA) and a clock line (SCL) to complete data transfer and peripheral device expansion, thereby providing communication lines between integrated circuits (ICs). Widely used in televisions, video recorders and audio equipment.
  • the television analog signal demodulating apparatus of the present application will be further described by taking the CVBS signal as an example.
  • the CVBS signal is an analog signal.
  • the TV analog signal demodulation device receives the CVBS signal and inputs it to the AD chip.
  • the AD chip converts the CVBS signal into a digital TS stream, which is transmitted to the USB bridge chip, processed by the USB bridge chip and transmitted to the main IC for processing. .
  • FIG. 6 is a schematic diagram of a method for demodulating a television analog signal according to an embodiment of the present application. As shown in FIG. 6, the method is applied to a television, and the method includes:
  • Step S61 receiving a video signal, where the video signal is an analog signal
  • Step S62 converting the analog signal into a digital signal, and transmitting the digital signal in a digital TS stream;
  • Step S63 converting the digital TS stream into a USB signal, and processing the USB signal.
  • the radio frequency receiving module receives the video signal, and the video signal is an analog signal
  • the AD chip converts the analog signal into a digital signal through analog-to-digital conversion processing, and transmits the digital signal in a digital TS stream;
  • a USB bridge chip converts the digital TS stream into a USB signal
  • the main IC processes the USB signal.
  • the AD chip converts the analog signal into a digital signal, it may also include:
  • the RF receiving module receives the analog signal and modulates the analog signal into a radio frequency signal for transmission to the television tuner.
  • the TV tuner converts the RF signal to an intermediate frequency signal and sends it to the modem.
  • the modem transmits and modulates the intermediate frequency signal to the AD chip.
  • the analog signal in this application is a CVBS signal.
  • the TV tuner, the modem, and the AD chip are processed into corresponding TS streams, and the USB bridge processes the TS stream, converts it into a USB signal, and sends it to the main IC, thereby solving the prior art. Cannot handle the drawbacks of analog signals.
  • the device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, ie may be located A place, or it can be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

一种电视模拟信号解调方法和装置，其中装置包括：射频接收模块，配置为接收视频信号，所述视频信号为模拟信号；AD芯片，配置为将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；USB桥片，配置为将所述数字TS流转换为USB信号；主IC，配置为对所述USB信号进行处理。本申请能够对模拟信号形式的视频信号进行处理，克服了现有技术只能支持数字信号处理的缺陷。

Description

一种电视模拟信号解调方法和装置
本申请要求于2016年3月22日提交中国专利局、申请号为201610165458.1，发明名称为“一种电视模拟信号解调方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及电视芯片技术领域，尤其涉及一种电视模拟信号解调方法和装置。
背景技术
在电视广告里，经常听到“XX电视采用了XX引擎”，难道电视里有跟汽车发动机一样的部件？其实，就像购买电脑一样，CPU是衡量电脑性能的核心部件，类比看来就相当于电脑的“引擎”，电视也有自己的“CPU”。除了液晶面板之外，电视的“CPU”非常关键，因为电视的一大目的是显色，对色彩的处理与显示器相比要严格很多。而影响电视图像最终质量的就是采用的电视芯片。
在智能手机领域，高通可谓是手机处理器性能的典型代表。对于智能电视来说，同样是运行着安卓的系统，高通已经进入电视芯片行业，也有很多厂商选择高通做为平台，但是到目前为止，高通平台本身不支持射频信号的调制。
为了解决此问题，发现问题的症结是目前的USB(Universal Serial Bus，通用串行总线)桥片可以处理数字码流，也可以转换为USB信号给主IC(Integrated Circuit，集成电路)处理。因此，现有的改进方案通常是增加外置tuner+demo的方式进行调制解调，解调出信号后通过一个芯片转换为USB信号给主IC处理。但是，对于模拟信号，例如CVBS(Composite Video Broadcast Signal，复合视频广播信号)还是不能处理，该CVBS是被广泛使用的标准，也叫做基带视频，以模拟波形来传输数据，复合视频包含色差(色调和饱和度)和亮度(光亮)信息，并将它们同步在消隐脉冲中，用同一信号传输。
因此，现有的改进方案至少会带来以下的问题：
1、只能支持数字的信号，比如国内的有线信号，用户只能收看器数 字频道，而模拟频道和广播信号都不能使用，给用户带来很多不便；
2、大部分人还是喜欢使用机顶盒观看电视，而机顶盒是通过一条信号线连接在AV(Audio Video，音频和视频)端口，其中的CVBS信号无法观看。
发明内容
本申请实施例提供一种电视模拟信号解调方法和装置，能够对模拟信号形式的视频信号进行处理，从而全部或者部分克服了现有技术只能支持数字信号处理的缺陷。
本申请实施例提供一种电视模拟信号解调装置，包括：
射频接收模块，配置为接收视频信号，所述视频信号为模拟信号；
AD芯片，配置为将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；
USB桥片，配置为将所述数字TS流转换为USB信号；
主IC，配置为对所述USB信号进行处理。
本申请实施例提供一种电视模拟信号解调方法，包括：
接收视频信号，所述视频信号为模拟信号；
将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；
将所述数字TS流转换为USB信号，并对所述USB信号进行处理。
本申请实施例提供的电视模拟信号解调方法和装置，通过所有模拟信号输入之后，经过电视调谐器、调制解调器和AD芯片处理为相应的TS流，此TS流进行模数转换后成为USB桥片能够处理的数字信号，也就是说，通过将输入的模拟信号转换成数字信号，然后给IC处理，从此解决了现有技术中不能处理模拟信号的弊端。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其 他的附图。
图1为本申请的一个具体实施例中电视模拟信号解调装置的结构示意图；
图2为本申请的一个具体实施例中射频信号转换给中频信号的示意图；
图3为本申请的一个具体实施例中TS包的示意图；
图4为本申请的一个具体实施例中TS流形成的示意图；
图5为本申请的一个具体实施例中模拟信号为CVBS信号时电视模拟信号解调装置的结构示意图；
图6本申请的一个具体实施例中电视模拟信号解调方法的流程示意图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
图1为本申请的一个具体实施例中电视模拟信号解调装置的结构示意图，如图1所示，该装置包括：
射频接收模块，配置为接收视频信号，所述视频信号为模拟信号。
具体地，射频接收模块以有线传输或无线传输的方式接收视频信号，该视频信号为模拟信号。
其中，模拟信号是指用连续变化的物理量表示的信息，其信号的幅度，或频率，或相位随时间作连续变化，例如目前广播的声音信号，或图像信号等。
射频接收模块将模拟信号调制为射频信号(RF信号)发送给电视调谐器。
电视调谐器，配置为接收射频接收模块传来的射频信号，并将射频信号转换为中频信号发送给调制解调器。
具体地，电视调谐器可以是Tuner芯片，Tuner芯片接收射频接收模块传来的射频信号，并将射频信号转换为中频信号。
如图2所示，射频信号转换给中频信号的方法可以依据：
IF＝|Fo-Fs|，
其中，IF是从电视调谐器输出的中频信号，Fo是本地振荡信号，Fs是输入的射频信号。
调制解调器，配置为接收电视调谐器传来的中频信号，并将中频信号进行调制解调传送给AD芯片。
具体地，调制是将数字基带信号转换成适于信道传输的数字调制信号，在接收端将收到的数字频带信号还原成数字基带信号。本实施例中，调制解调器将中频信号解调之后变换到基带，并将基带的编码信号进行解码。
AD芯片，配置为将经过调制解调的中频信号经过AD转换处理转换为数字信号，并将数字信号以数字TS(Transport Stream，传输流)形式传给USB桥片。
具体地，AD转换就是模数转换，在本实施里中，将经过调制解调的中频信号转换为数字信号，经过AD芯片转换的数字信号以数字TS流形式传给USB桥片。
如图3所示，TS包按功能分为链接头、适配域和净荷，其中链接头的长度固定为4个字节，适配域的长度从0字节到184字节可变，净荷数据的长度从0字节到184字节可变。TS流就是由许多长度为188字节的TS包周期性的排列形成的。
TS流产生过程如图4所示，视频ES和音频ES通过打包器和共同或独立的系统时间基准形成一个个PES，通过TS复用器复用形成的传输流，其中，ES流(Elementary Stream)，是基本码流，不分段的音频、视频或其他信息的连续码流；PES(Program Elementary Stream)流，是把基本流ES分割成段，并加上相应头文件打包成形的打包基本码流；则TS流是将具有共同时间基准或独立时间基准的一个或多个PES组合而成的单一数据流。
USB桥片，配置为接收AD芯片传来的数字TS流，并将数字TS流转换为USB信号传送给主IC。
具体地，USB桥片可以处理数字码流，当接收到数字TS流后，将数字TS流转换为USB信号，然后将USB信号传送给主IC处理。
在现有技术中，由于只能支持数据信号，所以模拟信号不能得到处理。在本申请的实施例中，通过所有模拟信号输入之后，经过电视调谐器、调制解调器和AD芯片处理为相应的TS流，此TS流进行模数转换后成为USB桥片能够处理的数字信号，也就是说，通过将输入的模拟信号转换成数字信号，然后给IC处理，从此解决了现有技术中不能处理模拟信号的弊端。
此外，电视调谐器和调制解调器之间采用I2C总线(I2C bus，Inter-IC bus)连接。该I2C总线是一个双向的两线连续总线，采用一条数据线(SDA)，加一条时钟线(SCL)来完成数据的传输及外围器件的扩展，从而提供集成电路(ICs)之间的通信线路，广泛应用于电视，录像机和音频设备。
如图5所示，以CVBS信号为例对本申请的电视模拟信号解调装置进行进一步说明。
CVBS信号是模拟信号，电视模拟信号解调装置接收到CVBS信号后输入到AD芯片，AD芯片将CVBS信号转换为数字TS流，传给USB桥片，经过USB桥片处理后传送给主IC处理。
图6为本申请的一个具体实施例中电视模拟信号解调方法的示意图，如图6所示，所述方法应用于电视上，该方法包括：
步骤S61，接收视频信号，所述视频信号为模拟信号；
步骤S62，将模拟信号转换为数字信号，并将所述数字信号以数字TS流传输；
步骤S63，将数字TS流转换为USB信号，并对所述USB信号进行处理。
具体地，
射频接收模块接收视频信号，所述视频信号为模拟信号；
AD芯片将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；
USB桥片将所述数字TS流转换为USB信号；
主IC对所述USB信号进行处理。
此外，在AD芯片将模拟信号转换为数字信号之前，还可以包括：
射频接收模块接收模拟信号，并将模拟信号调制为射频信号发送给电视调谐器。
电视调谐器将射频信号转换为中频信号发送给调制解调器。
调制解调器将中频信号进行调制解调传送给AD芯片。
具体地，本申请中的模拟信号为CVBS信号。
本申请实施例的电视模拟信号解调方法的具体技术细节和前述的电视模拟信号解调装置对应的描述类似，故在此不赘述。
本申请实施例通过在模拟信号输入后，电视调谐器、调制解调器和AD芯片处理为相应的TS流，USB桥片处理TS流，转换为USB信号后发送给主IC，从此解决了现有技术中不能处理模拟信号的弊端。
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的模块可以是或者也可以不是物理上分开的，作为模块显示的部件可以是或者也可以不是物理模块，即可以位于一个地方，或者也可以分布到多个网络模块上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到各实施方式可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件。基于这样的理解，上述技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行各个实施例或者实施例的某些部分所述的方法。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非 对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (10)

  1. 一种电视模拟信号解调装置，其特征在于，包括：
    射频接收模块，配置为接收视频信号，所述视频信号为模拟信号；
    AD芯片，配置为将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；
    USB桥片，配置为将所述数字TS流转换为USB信号；
    主IC，配置为对所述USB信号进行处理。
  2. 根据权利要求1所述的电视模拟信号解调装置，其特征在于，所述射频接收模块将接收到的模拟信号调制为射频信号。
  3. 根据权利要求2所述的电视模拟信号解调装置，其特征在于，所述装置还包括：
    电视调谐器，配置为接收射频接收模块传来的射频信号，并将所述射频信号转换为中频信号。
  4. 根据权利要求3所述的电视模拟信号解调装置，其特征在于，所述装置还包括：
    调制解调器，配置为接收电视调谐器传来的中频信号，并将所述中频信号进行调制解调传送给AD芯片。
  5. 根据权利要求1～4中任一项所述的电视模拟信号解调装置，其特征在于，所述模拟信号为CVBS信号。
  6. 一种电视模拟信号解调方法，应用于电视上，其特征在于，包括：
    接收视频信号，所述视频信号为模拟信号；
    将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；
    将所述数字TS流转换为USB信号，并对所述USB信号进行处理。
  7. 根据权利要求6所述的电视模拟信号解调方法，其特征在于，所述接收视频信号，具体为：射频接收模块接收视频信号，并将接收到的模拟信号调制为射频信号。
  8. 根据权利要求7所述的电视模拟信号解调方法，其特征在于，所述方法还包括：
    电视调谐器接收射频接收模块传来的射频信号，并将所述射频信号转换为中频信号。
  9. 根据权利要求8所述的电视模拟信号解调方法，其特征在于，所述方法还包括：。
    调制解调器接收电视调谐器传来的中频信号，并将所述中频信号进行调制解调传送给AD芯片。
  10. 根据权利要求9所述的电视模拟信号解调方法，其特征在于，所述AD芯片将所述模拟信号经过模数转换处理转换为数字信号，并将所述数字信号以数字TS流传输；USB桥片将所述数字TS流转换为USB信号；主IC对所述USB信号进行处理。
PCT/CN2016/088359 2016-03-22 2016-07-04 一种电视模拟信号解调方法和装置 Ceased WO2017161737A1 (zh)

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