CN101150696B - Method and device for improving receiving performance of high-definition multimedia interface - Google Patents
Method and device for improving receiving performance of high-definition multimedia interface Download PDFInfo
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- CN101150696B CN101150696B CN2007101632598A CN200710163259A CN101150696B CN 101150696 B CN101150696 B CN 101150696B CN 2007101632598 A CN2007101632598 A CN 2007101632598A CN 200710163259 A CN200710163259 A CN 200710163259A CN 101150696 B CN101150696 B CN 101150696B
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Abstract
A device for improving receiving performance of high definition multimedia interfaces is provided, which is characterized in comprising a high pass filter, a signal compensator and an adder. A method for improving receiving performance of high definition multimedia interfaces is characterized in generating compensation according to frequency and quality of HDMI signals, adding with original HDMI signals to get compensated HDMI signals. The method and the device of the invention can do self-adapting compensation for received HDMI signals conveniently in real time, has key effects for receiving and processing HDMI signals in long distance and atrocious conditions, can improve quality of received signals.
Description
Technical field
The present invention relates to multimedia technology field, relate in particular to the method and the device that improve receiving performance of high-definition multimedia interface.
Background technology
The continuous development of multimedia technology and people have expedited the emergence of the high-definition multimedia transmission technology for the demand of high-quality sound, video, the coffret of this multimedia high-speed data is HDMI (HighDefinition Multimedia, a HDMI (High Definition Multimedia Interface)) interface.HDMI mainly adopts TMDS (Transition Minimized Differential Signaling, transition minimized differential signaling) transmission technology transmits high-speed data, this technology is meant and by logical algorithms such as XOR, XNORs the primary signal data transaction is become 10 digital signal, preceding 8 bit data are obtained after computing by primary signal, the 9th mode that is used to refer to computing, the 10th then is used for corresponding its dc balance, and the data after the conversion transmit with the difference kind of drive.The TMDS algorithm can make that the upper punch and the following write-downs that are transmitted the signal transition process are little, and the data of transmission are tending towards dc balance, signal is reduced the electromagnetic interference of transmission line, thereby improve signal transmitting speed and reliability.HDMI has 3 TMDS passages, the speed of video pixel stream is generally between 25MHz～165MHz on each passage, the HDMI1.3 standard has risen to 225MHz with this upper limit, with each TMDS passage frequency computation part of the highest 165MHz, 24 pixel video data of 3 TMDS channel transfer R/G/B (red/green/indigo plant) or Y/Cb/Cr (brightness/chroma/contrast) form coding, high bandwidth can reach 4.95Gbps, the actual video signal transmission bandwidth is less than 4Gbps, and the required bandwidth of highest HD video form 1080p only is 2.2Gbps, so the bandwidth of HDMI is enough to satisfy now and the high voiceless sound of significant period of time from now on, the needs of video.Because the transmission rate of HDMI is very high, this has just determined that the transmission range of this high-frequency signal on cable can not be too far away, when transmission range during greater than 15 meters, even the quality of cable is pretty good, also can influence picture quality because eye pattern is closed.Therefore, growing the signal excessive attenuation that Distance Transmission brings is to influence the big obstacle that HDMI expands utilization.And at present, also not to the compensation method of HDMI signal.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and device that improves receiving performance of high-definition multimedia interface, to improve the transmission quality of HDMI signal under longer distance and mal-condition.
For addressing the above problem, the present invention proposes a kind of device that improves receiving performance of high-definition multimedia interface, it is characterized in that, comprise high pass filter, signal compensator and adder, wherein:
The input of described high pass filter links to each other with original HDMI input signal, outputs signal to signal compensator after the filtering low-frequency noise;
The input of described signal compensator receives the output signal of described high pass filter, to the compensation rate of described adder output according to the HDMI signal that the input signal analysis result is produced;
Described adder, two inputs are imported the compensation rate of original HDMI signal and the output of described signal compensator respectively, the HDMI signal after the back output compensation that superposes.
Further, said apparatus also can have following characteristics, described high pass filter be the minimum frequency value of HDMI signal frequency range by frequency.
Further, said apparatus also can have following characteristics, and described signal compensator comprises the frequency and the quality of signal to the analysis result of described input signal.
Further, said apparatus also can have following characteristics, and the compensation rate of the described HDMI signal that described signal compensator produces is a voltage compensation quantity.
Further, said apparatus also can have following characteristics, described signal compensator is judged described HDMI quality of signals according to the statistics of HDMI signal level amplitude, and described statistics is the ratio value that the HDMI semaphore of level amplitude in normal range (NR) accounts for total HDMI semaphore.
For addressing the above problem, the invention allows for a kind of method that improves receiving performance of high-definition multimedia interface, it is characterized in that, produce compensation rate according to the frequency of HDMI signal and quality, the HDMI signal after being compensated with original HDMI signal stack.
Further, said method also can have following characteristics, comprises the steps:
Further, said method also can have following characteristics, and described compensation rate is a voltage compensation quantity.
Further, said method also can have following characteristics, in the step 110, described high pass filter be the minimum frequency value of HDMI signal frequency range by frequency.
Further, said method also can have following characteristics, and described HDMI quality of signals judges that according to the statistics of HDMI signal level amplitude described statistics is the ratio value that the HDMI semaphore of level amplitude in normal range (NR) accounts for total HDMI semaphore.
By the method for the invention and device, the HDMI signal of receiving that can achieve a butt joint in real time, easily carries out adaptive equalization, for the reception of long distance and mal-condition (as poor quality's cable, magnetic field environment etc.) HDMI signal down and the effect that processing has key, can promote the quality of received signal preferably.HDMI signal after the inventive method compensation has better eye pattern, thereby has guaranteed the sound that receives, the integrality of vision signal, allows the transmission and the reception of HDMI signal of longer distance become possibility.
Description of drawings
Fig. 1 is the hardware structure schematic diagram of embodiment of the invention device.
Fig. 2 is the workflow diagram of the embodiment of the invention.
Embodiment
The present invention mainly is by the adaptive high frequency bucking-out system of being made up of high pass filter, digital signal compensator and adder, and the HDMI signal of decaying owing to long Distance Transmission is compensated, and improves the HDMI received signal quality.
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Embodiment
As shown in Figure 1, the system that the HDMI signal receiving end is carried out adaptive equalization comprises high pass filter, signal compensator and adder, the input of described high pass filter links to each other with original HDMI input signal, output links to each other with described signal compensation DSP input, two inputs of described adder link to each other with the output of original HDMI input signal and signal compensation DSP respectively, the HDMI signal of its output output after overcompensation, wherein:
High pass filter, it is determined according to the HDMI frequency input signal by frequency, is used to receive original HDMI input signal, the filtering low-frequency noise;
Signal compensator, present embodiment adopt digital signal processor DSP, and (Digital Signal Processor realizes, receives and analyze the output signal of high pass filter, produces HDMI voltage of signals compensation rate according to analysis result;
Adder superposes original HDMI signal and compensation rate, obtains high-quality HDMI input signal.
Determining according to the HDMI frequency input signal of high pass filter by frequency; The size that signal compensation DSP determines compensating factor according to the frequency and the quality of HDMI signal, and then determine concrete compensation rate.
As shown in Figure 2, in the present embodiment, realize that by the high-frequency signal compensation technique method that improves the HDMI signal receiving quality may further comprise the steps:
The HDMI signal has a definite frequency range, and this scope is known, the minimum frequency value of choosing this scope as high pass filter by frequency.
After the filtering, DSP analyzes the output signal of filter, at first judges the frequency of HDMI signal, and the frequency height is generally decayed severely, and corresponding compensation is just big, and this can automatically adjust by adjusting compensating factor; DSP can also with this size of determining compensating factor, give than large compensation for ropy signal according to the HDMI signal that receives is judged quality of signals.The HDMI signal quality can judge that statistics is the ratio value that the HDMI semaphore of level amplitude in normal range (NR) accounts for total HDMI semaphore by the statistics of HDMI signal level amplitude.
Sound, video data performance through the output of stack back will improve.
More than be the concrete steps that the compensation method of utilization adaptive high frequency compensates the HDMI received signal.
From realization mechanism and flow process, whole process is simple and reliable, real-time, and transmission, the reception under long distance and mal-condition provides good compensation and guarantee for the HDMI signal, uses for the expansion of HDMI to have very strong practical value.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. an adaptive high frequency compensation arrangement that improves HDMI (High Definition Multimedia Interface) HDMI receptivity is characterized in that, comprises high pass filter, signal compensator and adder, wherein:
The input of described high pass filter links to each other with original HDMI input signal, outputs signal to signal compensator after the filtering low-frequency noise;
The input of described signal compensator receives the output signal of described high pass filter, to the compensation rate of described adder output according to the HDMI signal that the input signal analysis result is produced;
Described adder, two inputs are imported the compensation rate of original HDMI signal and the output of described signal compensator respectively, the HDMI signal after the back output compensation that superposes.
2. device as claimed in claim 1 is characterized in that, described high pass filter be the minimum frequency value of HDMI signal frequency range by frequency.
3. device as claimed in claim 1 is characterized in that, described signal compensator comprises the frequency and the quality of signal to the analysis result of described input signal.
4. device as claimed in claim 1 is characterized in that, the compensation rate of the described HDMI signal that described signal compensator produces is a voltage compensation quantity.
5. device as claimed in claim 3, it is characterized in that, described signal compensator is judged described HDMI quality of signals according to the statistics of HDMI signal level amplitude, and described statistics is the ratio value that the HDMI semaphore of level amplitude in normal range (NR) accounts for total HDMI semaphore.
6. a method that improves receiving performance of high-definition multimedia interface is characterized in that, comprises the steps:
Step 110, high pass filter receive original HDMI input signal, output signal to signal compensation DSP after the filtering low-frequency noise;
Step 120, the compensating factor that signal compensation DSP determines the HDMI signal according to the frequency and the quality of HDMI signal, and then determine and output corresponding compensation amount to adder;
Step 130, adder is with original HDMI input signal and the stack of HDMI signal compensation amount, the HDMI signal after being compensated.
7. method as claimed in claim 6 is characterized in that, described compensation rate is a voltage compensation quantity.
8. method as claimed in claim 6 is characterized in that, in the step 110, described high pass filter be the minimum frequency value of HDMI signal frequency range by frequency.
9. method as claimed in claim 6, it is characterized in that, described HDMI quality of signals judges that according to the statistics of HDMI signal level amplitude described statistics is the ratio value that the HDMI semaphore of level amplitude in normal range (NR) accounts for total HDMI semaphore.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8560016B2 (en) * | 2012-01-04 | 2013-10-15 | Motorola Mobility Llc | Method and apparatus to prevent receiver desensitization from radiated HDMI signals in accessor or computing devices |
| CN103474843A (en) * | 2013-09-10 | 2013-12-25 | 杨举波 | Passive amplification type HDMI connecting wire |
| CN103700319A (en) * | 2013-12-26 | 2014-04-02 | 京东方科技集团股份有限公司 | Spliced display device |
| CN113286109A (en) * | 2014-06-12 | 2021-08-20 | 索尼公司 | Interface circuit and information processing system |
| CN104469232A (en) * | 2014-10-23 | 2015-03-25 | 曦威胜科技开发（深圳）有限公司 | HDMI signal transmission device supporting information superposition |
| CN105553480B (en) * | 2015-12-03 | 2018-11-20 | 一诺仪器（中国）有限公司 | Frequency measurement signal processing circuit |
| CN112423049B (en) * | 2020-10-27 | 2024-04-30 | 深圳Tcl新技术有限公司 | Information source connection display method, device, equipment and readable storage medium |
| CN115278137A (en) * | 2022-08-08 | 2022-11-01 | 深圳市品为科技有限公司 | High-definition multimedia interface extension line |
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| CN2788481Y (en) * | 2005-01-13 | 2006-06-14 | 四川长虹电器股份有限公司 | Multi-media digital TV set |
| CN1838756A (en) * | 2005-03-23 | 2006-09-27 | 模拟设备股份有限公司 | System and method for providing fixed rate transmission for digital image interface and high definition multimedia interface applications |
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