CN104917983A - Device, system and method for processing hiding subtitles in digital video signals - Google Patents
Device, system and method for processing hiding subtitles in digital video signals Download PDFInfo
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Abstract
The invention discloses a device, a system and a method for processing hiding subtitles in digital video signals. The method for processing a hiding subtitle in a digital video signal comprises steps of converting a digital video signal to a synchronous parallel signal in a same format, extracting a hiding subtitle signal from a digital video signal, generating a first signal which is same in the frequency of the digital video frequency, embedding the hiding subtitle signal into the first signal, converting the first signal embedded with the hiding subtitle signal to a subtitle simulation signal and transmitting the parallel signal and the subtitle simulation signal to a display processor. In the prior art, the display processors capable of encoding the hiding subtitle signal in the digital video signal can only encode the hiding subtitle in the simulation signal, so that the hiding subtitle signal is extracted first and then embedded into the first signal and then the first signal is converted to the simulation signal for encoding, which can utilizes the display processor in the prior art to perform encoding on the hiding subtitle in the digital signal.
Description
Technical field
The present invention relates to video display technology field, specifically a kind of device for the treatment of the closed caption in digital video signal, system and method.
Background technology
Vision signal usually carries closed caption (Closed Caption in the process of transmission, CC), CC captions are text versions that TV, film and computer picture explain orally, and except dialogue, also comprise the information such as the sound of object in sheet and music description.The initial object of CC captions exploitation has the user of obstacle to use to hearing, it appears at the below of screen usually, but nowadays it is all very useful in other many occasions, such as: in the environment that airport etc. is a riot of sound, when not hearing sound, just can read CC captions; Or in the environment that hospital etc. needs peace and quiet, also can read CC captions.CC captions are a kind of standard code modes Word message being embedded into vision signal and hideing in layer data, at the receiving terminal of television set (or other receiving systems), processor must be had to decode to coding Word message in video signals, just can demonstrate by the word of encoding, that is the device of receiving video signals must have the function of decoding and showing CC captions.
Vision signal is divided into analog video signal and digital video signal.When vision signal is analog video signal, traditional video-stream processor for video signal processing field is all generally adopt asic chip to realize decoding to the CC captions wherein loaded and showing, analog decoder, CC decoder and dot matrix (on-screen display, OSD) character base module is at least integrated with in described asic chip.Its course of work is: analog video signal is by entering CC decoder after analog decoder, CC decoder, by embedding closed caption decoder in video signals out, is then shown by OSD character base module.Because traditional asic chip for video signal processing field can only be decoded to the closed caption in analog video signal, so this kind is decoded to CC captions and the mode shown is not suitable for the situation that vision signal is digital signal.
When vision signal is digital video signal, in prior art, the CC captions wherein loaded to be decoded and the method shown mainly adopts the mode of external decoder chip, decode as utilized FPGA, its course of work is: change digital video signal into parallel signal and send to FPGA, FPGA does the superposition of display after this signal CC captions hidden in layer data are decoded to being in, finally sent to by the signal superposed display device (as: LCD screen) to show.Realize decoding to CC captions by as above method and the concrete grammar shown can be: FPGA decodes to CC captions, and by decoded data write Serial Peripheral Interface (SPI) (Serial Peripheral Interface, SPI) register, the controller of ASCI chip reads this data from SPI register, then by loading the display of OSD character base module realization to CC captions integrated in asic chip, or carry out the method that some improve on this basis, as: control to be arranged at OSD character base module in FPGA etc. by SPI register.Due to the display properties more complicated of CC captions, the workload being read data by the processor of asic chip from SPI register is very large, simultaneously, produce the producer of FPGA and need coding standard to CC captions and understanding thereof, general producer does not expend too large work at this place, so cause the display of CC captions there is no display properties (as: roll, be fade-in and gradually go out), thus do not reach real effect and the object of CC Subtitle Demonstration.
Summary of the invention
For this reason, the present invention proposes a kind of device for the treatment of the closed caption in digital video signal, system and method, and it can solve in prior art and the video-stream processor for video signal processing field of traditional maturation can not be utilized to decode and the technical problem shown to the closed caption in digital video signal.
Technical scheme of the present invention is as follows:
For the treatment of a device for the closed caption in digital video signal, comprising:
Signal acquiring unit, for obtaining digital video signal;
Signal conversion unit, for changing described digital video signal into form same with this digital video signal and synchronous parallel signal;
Signal extraction generation unit, for extracting the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency;
Signal embedded unit, for being embedded in described first signal by the described closed caption signal extracted;
D/A conversion unit, for being converted to captions analog signal by described first signal after embedding closed caption signal;
Transmitting element, for sending to video-stream processor by described parallel signal and described captions analog signal.
Described device, the described closed caption signal extracted is embedded into according to the standard of closed caption in the 21st row of the vertical blanking period of described first signal by described signal embedded unit.
Described device, described parallel signal to be sent to the digital video signal decoder in described video-stream processor by described transmitting element by DIP interface; Described captions analog signal to be sent to the captions analog signal decoder in described video-stream processor by described transmitting element by CVBS interface.
Described device, described video-stream processor is asic chip.
Described device, described digital video signal is SDI digital video signal; Described first signal is SD digital signal; Described video-stream processor is LCD processor.
For the treatment of a system for the closed caption in digital video signal, described system comprises interconnective front end signal processing module and D/A converter module, wherein,
Described front end signal processing module comprises:
Signal acquiring unit, for obtaining digital video signal;
Signal conversion unit, for changing described digital video signal into form same with this digital video signal and synchronous parallel signal;
First signal transmitting unit, for sending to video-stream processor by described parallel signal;
Signal extraction generation unit, for extracting the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency;
Signal embedded unit, is embedded in described first signal by the described closed caption signal extracted;
Described D/A converter module comprises:
D/A conversion unit, for being converted to captions analog signal by described first signal after embedding closed caption signal;
Secondary signal transmitting element, for sending to described video-stream processor by described captions analog signal.
Described system, described system also comprises video-stream processor and Signal averaging device, wherein,
Described video-stream processor comprises digital video signal decoder and captions analog signal decoder, for decoding to described parallel signal and described captions analog signal;
Described Signal averaging device sends to display device after decoded described parallel signal and described captions analog signal being superposed.
Described system, described parallel signal to be sent to the digital video signal decoder in described video-stream processor by described first signal transmitting unit by DIP interface; Described captions analog signal to be sent to the captions analog signal decoder in described video-stream processor by described secondary signal transmitting element by CVBS interface.
Described system, described video-stream processor is asic chip.
Described system, described digital video signal is SDI digital video signal; Described first signal is SD digital signal; Described video-stream processor is LCD processor.
For the treatment of a method for the closed caption in digital video signal, comprise the steps:
Obtain digital video signal;
Change described digital video signal into form same with this digital video signal and synchronous parallel signal;
Extract the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency;
The described closed caption signal extracted is embedded in described first signal;
Described first signal after embedding closed caption signal is converted to captions analog signal;
By described parallel signal and described captions analog signal with send to video-stream processor.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) the invention provides a kind of device for the treatment of the closed caption in digital video signal, achieve acquisition digital video signal, and change this digital video signal into parallel signal, also achieve by the closed caption signal extraction in digital video signal out, and generate one with the first signal of this digital video signal same frequency, the described closed caption signal extracted is embedded in described first signal, simultaneously, achieve described first signal after by embedding closed caption signal and be converted to captions analog signal, finally described parallel signal and captions analog signal are sent to video-stream processor.Due in prior art, the video-stream processor that closed caption signal in digital video signal is decoded can only be decoded to the closed caption in analog signal mostly, device provided by the invention will be embedded in the first signal again after closed caption signal extraction out, and after this first signal is transformed to analog signal, go decoding, be convenient to the later use video-stream processor for video signal processing field of the prior art and closed caption in digital video signal is processed.
(2) the invention provides a kind of system for the treatment of the closed caption in digital video signal, front end signal processing module in this system and D/A converter module can be independently interconnective device, the acquisition digital video signal by front end signal processing modules implement, and change this digital video signal into parallel signal, and this parallel signal is sent to video-stream processor, also achieve by the closed caption signal extraction in digital video signal out, and generate one with the first signal of this digital video signal same frequency, and described closed caption signal is embedded in described first signal, achieve described first signal after by embedding closed caption signal by D/A converter module and be converted to captions analog signal, and this act of analog signal is sent to described video-stream processor.Due in prior art, the video-stream processor that closed caption signal in digital video signal is decoded can only be decoded to the closed caption in analog signal mostly, system provided by the invention will be embedded in the first signal again after closed caption signal extraction out, and after this first signal is transformed to analog signal, go decoding, be convenient to the later use video-stream processor for video signal processing field of the prior art and closed caption in digital video signal is processed.
(3) the invention provides the method for the closed caption in a kind of fast acquisition of digital video signals, obtain digital video signal, change this digital video signal into form same with this digital video signal and synchronous parallel signal; By the closed caption signal extraction in digital video signal out, and generate one with the first signal of this digital video signal same frequency, and described closed caption signal is embedded in described first signal; The first signal embedding closed caption signal is converted to captions analog signal; Parallel signal and captions analog signal are sent to video-stream processor.Due in prior art, the video-stream processor that closed caption signal in digital video signal is decoded can only be decoded to the closed caption in analog signal mostly, the present invention will be embedded in the first signal again after closed caption signal extraction out, and after this first signal is transformed to analog signal, going decoding, this just can utilize the video-stream processor for video signal processing field of the prior art decode to being coded in closed caption signal in digital video signal and showing.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is according to an embodiment of the invention for the treatment of the flow chart of the method for the closed caption in digital video signal;
Fig. 2 is the structured flowchart of the device for the treatment of the closed caption in digital video signal according to second embodiment of the invention;
Fig. 3 is the structured flowchart of the system for the treatment of the closed caption in digital video signal according to third embodiment of the invention;
Reference numeral in figure: 1-signal acquiring unit, 2-signal conversion unit, 3-signal extraction generation unit, 4-signal embedded unit, 5-D/A conversion unit, 6-transmitting element, 7-first signal transmitting unit, 8-secondary signal transmitting element.
Embodiment
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of method for the treatment of the closed caption in digital video signal, comprises the steps:
S1: obtain digital video signal.In actual use, this digital video signal is generally SDI digital video signal, as: the SDI digital video signal of radio, TV and film industries, this SDI digital video signal is the digital video signal of serial.
S2: change described digital video signal into form same with this digital video signal and synchronous parallel signal.Because the processing speed of parallel data is far above serial data, so change the digital video signal of serial into same form and synchronous parallel signal, to improve processing speed.
S3: extract the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency.Because closed caption is a kind of standard code mode Word message being embedded into vision signal and hideing in layer data, then closed caption is embedded in digital video signal and hides in the fixed position of layer data, closed caption has specific protocol header in digital video signal hides layer, FPGA is by the coding standard of closed caption, can well judge and extract described closed caption signal, simultaneously, FPGA can generate first signal identical with described digital video signal frequency, be convenient to follow-up use, this first signal can be the digital signal of SD, as: 480I60 signal, simultaneously, those skilled in the art should be appreciated that the first signal herein also should with the digital video signal basic synchronization received.
S4: the described closed caption signal extracted is embedded in described first signal.The position embedded is: in the 21st row of the vertical blanking period of described first signal, that is: according to the VBI coding standard of closed caption, be embedded in described first signal by closed caption signal, be convenient to follow-up decoding.This step can have been come by FPGA equally.As can be seen from step S3 and S4, FPGA is by after closed caption signal extraction out, according to the VBI standard of closed caption, recompile is carried out to it, concrete parsing is not carried out to it, therefore the producer producing FPGA does not need to do detailed understanding to the coding standard of closed caption.
S5: described first signal after embedding closed caption signal is converted to captions analog signal.The form of this captions analog signal can be: NTSC form.This captions analog signal can be decoded for the asic chip for LCD driving of video display technology field or television-specific by prior art.Due in prior art, for the processor of decoding to closed caption signal, mostly the closed caption in analog signal can only be decoded, so signal is done the transformation as step S5, be convenient to follow-uply to decode to signal.
S6: by described parallel signal and described captions analog signal with send to video-stream processor.Described video-stream processor comprises digital video signal decoder and captions analog signal decoder, and described captions analog decoder extracts the closed caption in described captions analog signal and decodes.Described video-stream processor can be LCD processor of the prior art, when described video-stream processor is LCD processor and the digital video signal received is SDI digital video signal, described first signal is generally SD digital signal, described captions analog signal is the analog signal of NTSC form, facilitates the use LCD processor and decodes to closed caption.Described video-stream processor can also be the asic chip driven for LCD for the asic chip of video signal processing field or television-specific, at least integrated digital video decoding signals and captions analog signal decoder in this asic chip, described captions analog signal decoder comprises: analog decoder, closed caption decoder and dot matrix word library module.
As a kind of specific implementation, when described video-stream processor is the asic chip driven for LCD for the asic chip of video signal processing field or television-specific, because this asic chip has the function of two picture display, the signal that wherein main channel receives sends to main window, and the signal that subaisle receives sends to secondary window.The detailed process of video-stream processor then described parallel signal (that is: raw digital video signal) and described captions analog signal is sent to be in step S6:
First, described parallel signal (that is: raw digital video signal) is sent to the main window of asic chip by main channel and DIP interface, described main window corresponds to described digital video signal decoder, that is: raw video signal enters main channel and processs and displays.The display of major-minor window is opened by described asic chip before this step.
Secondly, described captions analog signal is sent to the secondary window of asic chip by subaisle (this channel setting is that image window is hidden) and CVBS interface, described secondary window corresponds to described captions analog signal decoder.Process because described analog signal enters subaisle, described closed caption is wherein decoded, by dot matrix word library module integrated in association ASCI chip after decoding, by subtitle superposition on the image of main channel, send to display device, namely achieve the display to closed caption.
Those skilled in the art should be appreciated that and utilize described asic chip to carry out to the described digital video signal received and described captions analog signal the process processed of decoding, the same with process of the prior art, are not therefore described in detail at this.
Present embodiments provide the method for the closed caption in a kind of fast acquisition of digital video signals, obtain digital video signal, change this digital video signal into form same with this digital video signal and synchronous parallel signal; By the closed caption signal extraction in digital video signal out, and generate one with the first signal of this digital video signal same frequency, described closed caption signal is embedded in described first signal; The first signal embedding closed caption signal is converted to captions analog signal; Parallel signal and captions analog signal are sent to video-stream processor.Due in prior art, the video-stream processor that closed caption signal in digital video signal processes can only be decoded to the closed caption in analog signal mostly, the present invention will be embedded in the first signal again after closed caption signal extraction out, and after this first signal is transformed to analog signal, going decoding, this just can utilize the video-stream processor for LCD driving for video signal processing field or television-specific of the prior art decode to being coded in closed caption signal in digital video signal and showing.
Embodiment 2
As shown in Figure 2, the present embodiment provides a kind of device for the treatment of the closed caption in digital video signal, comprising:
Signal acquiring unit 1, for obtaining digital video signal.In actual use, this digital video signal is generally SDI digital video signal, as: the SDI digital video signal of radio, TV and film industries, this SDI digital video signal is the digital video signal of serial.
Signal conversion unit 2, for changing described digital video signal into form same with this digital video signal and synchronous parallel signal.This signal conversion unit 2 can be realized by FPGA.
Signal extraction generation unit 3, for extracting the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency.This first signal can be the digital signal of SD, as: 480I60 signal.
Signal embedded unit 4, for being embedded into the described closed caption signal extracted in described first signal.As a kind of specific implementation, described closed caption signal is embedded into according to the VBI standard of closed caption in the 21st row of the vertical blanking period of described first signal.
D/A conversion unit 5, for being converted to captions analog signal by described first signal after embedding closed caption signal.This captions analog signal can be decoded for the asic chip for LCD driving of video display technology field or television-specific by prior art, and the form of this captions analog signal can be: NTSC form.
Transmitting element 6, for sending to video-stream processor by described parallel signal and described captions analog signal.This video-stream processor can be LCD video-stream processor or the asic chip driven for LCD for the asic chip in video Graphics Processing field or television-specific, wherein all includes digital video signal decoder and captions analog signal decoder.When described video-stream processor is LCD processor and the digital video signal received is SDI digital video signal, described first signal is generally SD digital signal, described captions analog signal is the analog signal of NTSC form, facilitates the use LCD processor and decodes to closed caption.
As a kind of specific implementation, described parallel signal to be sent to the digital video signal decoder in described video-stream processor by described transmitting element by DIP interface; Described captions analog signal to be sent to the captions analog signal decoder in described video-stream processor by described transmitting element by CVBS interface.
Above-mentioned unit is integrated with in a kind of device for the treatment of the closed caption in digital video signal that the present embodiment provides, the arrangement achieves acquisition digital video signal, and change this digital video signal into parallel signal, also achieve by the closed caption signal extraction in digital video signal out, and generate one with the first signal of this digital video signal same frequency, the described closed caption signal extracted is embedded in described first signal, simultaneously, achieve described first signal after by embedding closed caption signal and be converted to captions analog signal, finally described parallel signal and captions analog signal are sent to video-stream processor.Due in prior art, the video-stream processor that closed caption signal in digital video signal is decoded can only be decoded to the closed caption in analog signal mostly, device provided by the invention will be embedded in the first signal again after closed caption signal extraction out, and after this first signal is transformed to analog signal, go decoding, be convenient to the later use video-stream processor for video signal processing field of the prior art and closed caption in digital video signal is processed.
Embodiment 3
As shown in Figure 3, the present embodiment provides a kind of system for the treatment of the closed caption in digital video signal, and described system comprises interconnective front end signal processing module and D/A converter module, wherein,
Described front end signal processing module comprises:
Signal acquiring unit 1, for obtaining digital video signal.In actual use, this digital video signal is generally SDI digital video signal, as: the SDI digital video signal of radio, TV and film industries, this SDI digital video signal is the digital video signal of serial.
Signal conversion unit 2, for changing described digital video signal into form same with this digital video signal and synchronous parallel signal.This signal acquiring unit 1 and signal conversion unit 2 can be realized by FPGA, detailed process is: obtain digital video signal by FPGA, and converts this digital video signal to described parallel signal by FPGA, and this just saves components and parts, save cost, optimize flow process.It will be understood by those skilled in the art that this signal acquiring unit 1 and this signal conversion unit 2 are realized also being fine by the transformation from serial to parallel module of peripheral hardware.
First signal transmitting unit 7, for sending to video-stream processor by described parallel signal; As a kind of specific implementation, described parallel signal to be sent to the digital video signal decoder in described video-stream processor by described first signal transmitting unit 7 by DIP interface.
Signal extraction generation unit 3, for extracting the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency.Described first signal can be the digital signal of SD, as: 480I60 signal.This signal extraction generation unit 3 can be realized by FPGA.
Signal embedded unit 4, is embedded into the described closed caption signal extracted in described first signal.As a kind of specific implementation, described closed caption signal is embedded into according to the VBI standard of closed caption in the 21st row of the vertical blanking period of described first signal.This signal embedded unit 4 can be realized by FPGA equally.
Described D/A converter module can be realized by special analog-digital chip or D/A converting circuit, and described D/A converter module comprises:
D/A conversion unit 5, for being converted to captions analog signal by described first signal after embedding closed caption signal.The form of this captions analog signal can be: NTSC form, and this captions analog signal can be decoded for the asic chip for LCD driving of video display technology field or television-specific by prior art.
Secondary signal transmitting element 8, for sending to described video-stream processor by described captions analog signal; As a kind of specific implementation, described captions analog signal to be sent to the captions analog signal decoder in described video-stream processor by described secondary signal transmitting element 8 by CVBS interface.
On the basis of such scheme, described system can also comprise video-stream processor and Signal averaging device, wherein,
Described video-stream processor comprises digital video signal decoder and captions analog signal decoder, for decoding to described parallel signal and described captions analog signal.This video-stream processor can be LCD video-stream processor or the asic chip driven for LCD for the asic chip in video Graphics Processing field or television-specific, wherein all includes digital video signal decoder and captions analog signal decoder.When described video-stream processor is LCD processor and the digital video signal received is SDI digital video signal, described first signal is generally SD digital signal, described captions analog signal is the analog signal of NTSC form, facilitates the use LCD processor and decodes to closed caption.
Described Signal averaging device sends to display device after decoded described parallel signal and described captions analog signal being superposed.As a kind of specific implementation, this Signal averaging device can be realized by FPGA, and the process of superposition is consistent with of the prior art, is not therefore described in detail at this.
The invention provides a kind of system for the treatment of the closed caption in digital video signal, front end signal processing module in this system and D/A converter module can be independently interconnective device, the acquisition digital video signal by front end signal processing modules implement, and change this digital video signal into parallel signal, and this parallel signal is sent to video-stream processor, also achieve by the closed caption signal extraction in digital video signal out, and generate one with the first signal of this digital video signal same frequency, and described closed caption signal is embedded in described first signal, achieve described first signal after by embedding closed caption signal by D/A converter module and be converted to captions analog signal, and this captions analog signal is sent to described video-stream processor.Due in prior art, the video-stream processor that closed caption signal in digital video signal is decoded can only be processed the closed caption in analog signal mostly, system provided by the invention will be embedded in the first signal again after closed caption signal extraction out, and after this first signal is transformed to analog signal, go decoding, be convenient to the later use video-stream processor for video signal processing field of the prior art and closed caption in digital video signal is processed.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And thus the apparent change of extending out or variation be still among the protection range of the invention.
Claims (11)
1. for the treatment of a device for the closed caption in digital video signal, it is characterized in that, comprising:
Signal acquiring unit (1), for obtaining digital video signal;
Signal conversion unit (2), for changing described digital video signal into form same with this digital video signal and synchronous parallel signal;
Signal extraction generation unit (3), for extracting the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency;
Signal embedded unit (4), for being embedded in described first signal by the described closed caption signal extracted;
D/A conversion unit (5), for being converted to captions analog signal by described first signal after embedding closed caption signal;
Transmitting element (6), for sending to video-stream processor by described parallel signal and described captions analog signal.
2. device according to claim 1, is characterized in that, the described closed caption signal extracted is embedded into according to the standard of closed caption in the 21st row of the vertical blanking period of described first signal by described signal embedded unit (4).
3. device according to claim 1 and 2, is characterized in that, described parallel signal to be sent to the digital video signal decoder in described video-stream processor by described transmitting element by DIP interface; Described captions analog signal to be sent to the captions analog signal decoder in described video-stream processor by described transmitting element by CVBS interface.
4., according to the arbitrary described device of claim 1-3, it is characterized in that, described video-stream processor is asic chip.
5., according to the arbitrary described device of claim 1-4, it is characterized in that, described digital video signal is SDI digital video signal; Described first signal is SD digital signal; Described video-stream processor is LCD processor.
6. for the treatment of a system for the closed caption in digital video signal, it is characterized in that, described system comprises interconnective front end signal processing module and D/A converter module, wherein,
Described front end signal processing module comprises:
Signal acquiring unit (1), for obtaining digital video signal;
Signal conversion unit (2), for changing described digital video signal into form same with this digital video signal and synchronous parallel signal;
First signal transmitting unit (7), for sending to video-stream processor by described parallel signal;
Signal extraction generation unit (3), for extracting the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency;
Signal embedded unit (4), is embedded in described first signal by the described closed caption signal extracted;
Described D/A converter module comprises:
D/A conversion unit (5), for being converted to captions analog signal by described first signal after embedding closed caption signal;
Secondary signal transmitting element (8), for sending to described video-stream processor by described captions analog signal.
7. system according to claim 6, is characterized in that, described system also comprises video-stream processor and Signal averaging device, wherein,
Described video-stream processor comprises digital video signal decoder and captions analog signal decoder, for decoding to described parallel signal and described captions analog signal;
Described Signal averaging device sends to display device after decoded described parallel signal and described captions analog signal being superposed.
8. the system according to claim 6 or 7, is characterized in that, described parallel signal to be sent to the digital video signal decoder in described video-stream processor by described first signal transmitting unit (7) by DIP interface; Described captions analog signal to be sent to the captions analog signal decoder in described video-stream processor by described secondary signal transmitting element (8) by CVBS interface.
9., according to the arbitrary described system of claim 6-8, it is characterized in that, described video-stream processor is asic chip.
10., according to the arbitrary described system of claim 6-9, it is characterized in that, described digital video signal is SDI digital video signal; Described first signal is SD digital signal; Described video-stream processor is LCD processor.
11. 1 kinds for the treatment of the method for the closed caption in digital video signal, is characterized in that, comprise the steps:
Obtain digital video signal;
Change described digital video signal into form same with this digital video signal and synchronous parallel signal;
Extract the closed caption signal in described digital video signal, and generate one with the first signal of described digital video signal same frequency;
The described closed caption signal extracted is embedded in described first signal;
Described first signal after embedding closed caption signal is converted to captions analog signal;
By described parallel signal and described captions analog signal with send to video-stream processor.
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| CN114302215A (en) * | 2021-12-29 | 2022-04-08 | 北京奕斯伟计算技术有限公司 | Video data stream decoding system, method, electronic device, and medium |
| CN114302215B (en) * | 2021-12-29 | 2023-09-29 | 北京奕斯伟计算技术股份有限公司 | Video data stream decoding system, method, electronic device and medium |
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| CN104917983B (en) | 2018-04-27 |
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