CN101207766A - Method and apparatus for judging audio-visual data time sequence of high-density multimedia interface - Google Patents
Method and apparatus for judging audio-visual data time sequence of high-density multimedia interface Download PDFInfo
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Abstract
An audiovisual data processing method used for a high density multimedia interface includes the steps that audiovisual data is received; the audiovisual data is sampled according to a sampling clock; a sampling model is output according to the sampled audiovisual data and the sampled sampling clock; the sampling model is compared with a plurality of prearranged models; when the sampling model is matched with one of the prearranged models, the time sequence of the audiovisual data is judged; the audiovisual data is output according to the time sequence of the audiovisual data.
Description
Technical field
The present invention refers to a kind of high-density multimedia interface＜High Density MultimediaInterface that is used for, HDMI〉audio-visual data processing method and relevant apparatus thereof, especially refer to a kind of controlled area type sample (pattern), judge the audio-visual data time sequence determination methods and the relevant apparatus thereof of the sequential of audio-visual data according to the serial audio-visual data.
Background technology
Along with popularizing of Digital Television, DVD playback equipment, and high density planes display (as LCD TV and plasma television) comes into the market, and the epoch of really enjoying high density and high quality graphic video arrive finally.Yet the signal transmission interface of flat-panel screens is a main flow with traditional analog interface still, cause the distance and the bandwidth of signal transmission to be restricted, and flat-panel screens must become digital signal with analog signal conversion by built-in analog-digital converter.In this case, except having on the conversion of signals the very big loss, also make signal transmission distance less than 2 to 3 meters.Therefore, seven companies such as Intel propose a kind of signal transmission interface-digital visual interface＜Digital Visual Interface of digital display special use, DVI jointly at this problem 〉.The DVI interface is used for transmitting the picture signal of digital pattern to display unit, because digital signal can be via coding (Coding), compression (Compression), error correction operations such as (Error Correction), therefore can obtain high picture quality, and transmission range also can extend to the 10-20 meter.But because the volume of DVI joint is big and transmitting audio signal simultaneously, so mainly only be used to the view data transmission between computer and the display.
High-density multimedia interface＜High Definition Multimedia Interface, HDMI〉be based on DVI, at the coffret that next generation multimedia audio and video equipment is developed, be applicable to Digital Television, DVD Video Recorder, video converter (Set-top Box) and other digital audio-video commodity of digital household appliances.Its greatest feature is that synthetic image and voice signal together transmit, and is different with the audio-video separated transmission of tradition, and adopts the digital data transfer of non-compression, can effectively reduce the signal that is caused in numeral and the analog-converted and disturb and decay.Compared to the DVI interface, the HDMI interface is except joint more the miniaturization, and the control signal that can also add between audio frequency and the equipment in original vision signal transmits.In addition, the HDMI interface can load HDCP technology＜High Bandwidth DigitalContent Protection, HDCP 〉, in order to prevent the bootlegging of digital signal, view data.
See also Fig. 1, Fig. 1 is the schematic diagram of a HDMI sending/receiving system 100.The HDMI interface has adopted transition minimized differential signaling＜Transition Minimized Differential Signaling, TMDS〉coded system, comprise four transmission channels, wherein three channels are used for transmitting data＜TMDS channel 0～TMDS channel 2〉and a channel that is used for the transfer clock data.Video data information channel＜Display Data Channel, DDC〉be the extending display identification data＜Extended Display Identification Data that is used to read display capabilities such as expression receiver side density, EDID〉holding wire.Wherein, transmitter 110 is at first with image, voice signal conversion and synthesize the signal form that can receive at receiver 120.Then, 110 pairs of audio-visual datas of transmitter carry out the TMDS coding, and parallel image picture element data and voice data are carried out the serialization processing, transmit with small magnitude differential signal form.The processing of carrying out at receiver 120 then with the transmitter side reversed in order, do not give unnecessary details in addition.
Generally speaking, transmitter 110 can be exported orderly serial audio-visual data respectively to the TMDS channel in the same time.Yet, difference by configuration or production process, the length of each TMDS channel, impedance, gain, decay etc. may be different, cause in the process of transfer of data, and the data passes of different TMDS channels can produce delay (being sequential degrees of offset difference) in various degree.In this case, receiver 120 can't be in being received in the audio-visual data that transmits on all TMDS channels simultaneously.So, can correctly extract desired audio-visual data in order to make receiver 120, how to judge and the transfer of data sequential of adjusting data channel just becomes extremely important problem.Yet, in the standard of HDMI and in the known technology, there is no method and the device that instruction realizes the judgment data sequential.
Summary of the invention
Therefore, main purpose of the present invention promptly is a kind of audio-visual data processing method and relevant apparatus thereof that is used for high-density multimedia interface.
The present invention discloses a kind of one high-density multimedia interface＜High Density MultimediaInterface, HDMI of being used for〉the audio-visual data processing method, include the reception audio-visual data; According to a sampling clock, this audio-visual data of taking a sample; According to this audio-visual data and this sampling clock after the sampling, export a sampling type sample; Relatively this sampling type sample and a plurality of default type sample; When this sampling type sample conforms to a default type sample of these a plurality of default type samples, judge the sequential of this audio-visual data; And, export this audio-visual data according to the sequential of this audio-visual data.
The present invention discloses a kind of one high-density multimedia interface＜High Density MultimediaInterface, HDMI of being used in addition〉the audio-visual data processing unit, it includes a receiving element, is used for receiving audio-visual data; One sampling unit is coupled to this receiving element, is used for according to a sampling clock this audio-visual data of taking a sample; One buffer is coupled to this sampling unit, is used for exporting a sampling type sample according to this audio-visual data after this sampling and this sampling clock; One comparing unit is coupled to this buffer, is used for relatively this sampling type sample and a plurality of default type sample; One sequential decision unit is coupled to this comparing unit, is used for comparative result according to this comparing unit, when this sampling type sample and one of these a plurality of default type samples are preset the type sample and conformed to, judges the sequential of this audio-visual data; And an output unit, be coupled to this sequential decision unit, be used for sequential according to this audio-visual data, export this audio-visual data.
Description of drawings
Fig. 1 is the schematic diagram of a HDMI sending/receiving system.
Fig. 2 is the data format schematic diagram of known TMDS channel transmission.
Fig. 3 is used for the flow chart of an audio-visual data handling process of high-density multimedia interface for the present invention.
Fig. 4 is the embodiment schematic diagram of flow process of the present invention.
Fig. 5 is the functional block diagram of high-density multimedia interface audio-visual data processing unit of the present invention.
Fig. 6 is a default type sample schematic diagram of the control signal period of known TMDS channel transmission
The main element symbol description
100 HDMI sending/receiving systems
110 transmitters
120 receivers
210 packet periods
220 video data periods
230 control signal periods
200,202,204,206 type samples
30 audio-visual data handling processes
300,310,320,330,340,350,360,370,380 steps
400 serial audio-visual datas
Serial audio-visual data after 402 samplings
404,406,408,410 sampling type samples
50 audio-visual data processing unit
510 receiving elements
520 sampling units
530 buffers
540 comparing units
550 sequential decision unit
560 output units
The D0-D7 position
T0, t1 time
Embodiment
For clearly demonstrating the present invention, below the data format of explanation TMDS channel transmission earlier.See also Fig. 2, Fig. 2 is the data format schematic diagram of known TMDS channel transmission.As shown in Figure 2, in the data of TMDS channel transmission, can be divided into three kinds of data periods: packet period 210, video data period 220 and control signal period 230.The packet period 210 is transmitted voice signal and auxiliary signal in the audio-visual data in the mode of packet; What the video data periods 220 transmitted then is the video data of image picture element in the audio-visual data; The control signal period 230 then is to be used for transmitting audio-visual data literary composition part＜preamble before 〉, its function is that the data that next decoder is transmitted are packet period 210 or video data 220.Therefore, no matter before packet period 210 or video data period 220, must have a control signal period 230, in other words, promptly between the period, must include a control signal period 230 any two data that comprise audio-visual data.In addition, in the HDMI interface, each same time of TMDS channel can be transmitted the data＜position D0-D7 of 8 positions 〉.Packet period 210 utilizations 4 position D0-D3 transmission data wherein wherein, and 230 of control signal periods have been utilized wherein 2 position D0-D1.Before transmitter sends the audiovisual/visual information data, parallel audio-visual data position D0-D7 can be carried out the serialization encoding process, transmit the position of 10 serials of transmission under each pixel clock with small magnitude differential signal form.Owing to have only 2 parallel position D0, D1 to need transmission in the same time of control signal period, after therefore handling, only can produce 4 kinds of different type samples by serialization, as shown in Figure 6, type sample 200,202,204,206.Therefore, the present invention can judge the audio-visual data time sequence of the sequential of audio-visual data according to the controlled area type sample of serial audio-visual data.
See also Fig. 3, Fig. 3 is used for the flow chart of an audio-visual data handling process 30 of high-density multimedia interface for the present invention.Flow process 30 is used for judging the sequential of audio-video data in the high-density multimedia interface, and it comprises following steps:
Step 300: beginning.
Step 310: receive audio-visual data.
Step 320: according to a sampling clock, this audio-visual data of taking a sample.
Step 330:, export a sampling type sample according to this audio-visual data and this sampling clock after the sampling.
Step 340: relatively this sampling type sample and a plurality of default type sample.
Step 350: judge whether this sampling type sample conforms to a default type sample of these a plurality of default type samples.If conform to, then execution in step 355; If not, then get back to step 330.
Step 352: judge next group sampling type sample and should whether conform to by default type sample.If continuous three groups of sampling type samples all conform to this default type sample, then execution in step 354; If not, then get back to step 330.
Step 354: according to second group of pairing sampling clock of sampling type sample as a benchmark sampling clock.
Step 356: according to this benchmark sampling clock, this audio-visual data after this sampling is taken a sample, export a plurality of sampling type samples continuously; And relatively whether these a plurality of sampling type samples conform to this default type sample.If conform to, then execution in step 360; If not, then get back to step 330.
Step 360: the sequential of judging this audio-visual data.
Step 370:, export this audio-visual data according to the sequential of this audio-visual data.
Step 380: finish.
According to flow process 30, in the HDMI interface, when receiver receive one utilize the serial audio-visual data of TMDS coded system transmission after＜step 310, then audio-visual data is taken a sample＜step 320 with a sampling clock 〉, and according to audio-visual data and sampling clock after the sampling, output sampling type sample.Then, relatively whether the sampling type sample conforms to a default type sample of a plurality of default type samples; If conform to, according to the pairing benchmark sampling clock of this sampling type sample, this audio-visual data after this sampling is taken a sample, export a plurality of sampling type samples continuously, then relatively whether these a plurality of sampling type samples conform to this default type sample; If conform to, judge the sequential of audio-visual data, and export audio-visual data according to this; If do not conform to, then produce the sampling type sample again.Thus, the present invention can judge the sequential of audio-visual data, to carry out subsequent treatment when the sampling type sample conforms to a default type sample.
Preferably, the present invention utilizes 3 times of oversampling＜Over-sampling〉mode takes a sample to the serial audio-visual data, thus, can do repeated sampling to same data bit, to increase the correctness of judging the serial audio-visual data time sequence.For example, 3 overtones bands with TMDS channel data position transfer clock frequency carry out oversampling, promptly 30 of pixel clock times.Therefore, the serial audio-visual data bit quantity after the sampling is 3 times of original serial audio-visual data, and will be temporary in earlier in the buffer.Then, take out one in regular turn every 3 positions in the serial audio-visual data after sampling, take out 10 positions altogether, as a sampling type sample＜step 330 〉.Relatively preset type sample＜type samples 200,202,204,206 for 4 groups of this sampling type sample and control signal period〉＜step 340 〉, if comparative result conforms to, the sampling type sample of then representing 10 is a control signal, according to the position of sampling type sample start bit in buffer, just can obtain the correct sequential＜step 350 of serial audio-visual data 〉.If comparative result conforms to, preferably can continue according to the serial audio-visual data after the sampling in the buffer, begin to obtain another sampling type sample by the next bit of original samples position, and compare with correct default type sample.Note that alleged correct default type sample refers to the default type sample that is obtained when comparative result conforms to for the first time herein.If continuous 3 times in this way sampling type sample is all identical with default type sample comparative result, then be as the criterion with the 2nd time sampling type sample, and with corresponding sampling clock as a benchmark sampling clock, this audio-visual data after this sampling is taken a sample, export a plurality of sampling type samples continuously.Then, relatively these a plurality of sampling type samples with should default type sample, by repeating the mode of comparison, increase accuracy＜step 355 of judging controlled area type sample 〉.At last, after the sequential decision of serial audio-visual data, can export the audio-visual data of this correct sequential, decoder decode is provided by an output device.＜step 360 〉
If comparative result does not conform to, then the next bit of this serial audio-visual data after the sampling begins in buffer, takes out 1 in regular turn every 3 positions, take out 10 positions altogether, as the sampling type sample of another output, compare with 4 groups of default type samples of control signal period, then carry out step 355 if conform to.Repeat such step, till comparative result conforms to always.Because in the standard of HDMI, therefore the delay error of standard audio-visual data transmission must in the very short time, must find the comparative result that conforms to default type sample in 0.4 pixel clock clearly.
For instance, please refer to Fig. 4, Fig. 4 is the embodiment schematic diagram of flow process 30 of the present invention.As shown in the figure, receiver begins to receive serial audio-visual data 400 at time t0.Because each data channel has different length and impedance, causes the delay that has on the data passes in various degree.In the present embodiment, time of delay, t1 was 2 positions, that is time of delay, length was 0.2 pixel clock.Then, utilize a frequency serial audio-visual data 400 to be carried out oversampling for the sampling clock of 3 times of TMDS channel data position transfer clocks.Serial audio-visual data 402 its number of data bits after the sampling are 3 times of original serial audio-visual data, and will be temporary in the buffer.Then,, take out 1 in regular turn, take out 10 positions altogether, as the sampling type sample 404 of an output every 3 positions by first position beginning of the serial audio-visual data 402 after the sampling.Relatively preset type sample＜type samples 200,202,204,206 for four groups of sampling type sample 404 and control signal period 〉.Because comparative result does not conform to, therefore, every three positions, take out 10 positions again, as the sampling type sample 406 of another output by second beginning of the serial audio-visual data 402 after the sampling.Then, relatively preset type sample＜type samples 200,202,204,206 for four groups of sampling type sample 406 and control signal period 〉, then do not repeat above-mentioned steps if do not conform to always, conform to up to comparative result.In the present embodiment, the sampling type sample 408 that is begun to take out in regular turn by the 7th position in the serial audio-visual data 402 after the sampling just conforms to default type sample 202 of control signal period.Therefore according to the position of the serial audio-visual data 402 of sampling type sample 408 start bits after sampling, the delay that just can judge serial audio-visual data 400 is 2 positions.At last, by the sequential of output device, export correct serial audio-visual data for decoder decode according to judged result adjustment serial audio-visual data 400.In the present embodiment, preferably can continue the 8th position in the serial audio-visual data 402 after sampling, the 9th position begins to take out sampling type sample 410,411 again, compare with default type sample 202, because of continuous 3 groups of sampling type samples all conform to default type sample 202; Therefore with sampling type sample 410 pairing sampling clocks as a benchmark sampling clock, the serial audio-visual data 402 after the sampling is taken a sample.If repeatedly all can obtain correct sampling type sample with this benchmark sampling clock continuous sampling, controlled area type sample then can judge rightly out.Therefore, the present invention carries out the judgement of audio-visual data time sequence by repeating the mode of comparison, increases the accuracy of judging.At this, the sampling number of times is not limited to specific times, but depends on system effectiveness and can stand the size of error.
See also Fig. 5, Fig. 5 is high-density multimedia interface of the present invention＜High Density MultimediaInterface, HDMI〉functional block diagram of audio-visual data processing unit 50.Audio-visual data processing unit 50 can be in order to realization flow 30, and it includes a receiving element 510, a sampling unit 520, a buffer 530, a comparing unit 540, sequential decision unit 550 and an output unit 560.Receiving element 510 is used for receiving the serial audio-visual data of a TMDS channel.Sampling unit 520 is coupled to receiving element 510, is used for utilizing a sampling clock that the serial audio-visual data that receiving element 510 receives is taken a sample.Buffer 530 is coupled to sampling unit 520, is used for exporting a sampling type sample according to audio-visual data and sampling clock after the sampling.Comparing unit 540 is coupled to buffer 530, is used for comparison sampling type sample and a plurality of default type sample.Sequential decision unit 550 is coupled to comparing unit 540, is used for comparative result according to comparing unit 540, when the sampling type sample conforms to a default type sample of a plurality of default type samples, and the sequential of judgement audio-visual data.And output unit 560 is coupled to sequential decision unit 550, is used for sequential according to audio-visual data, the output audio-visual data.
In the present invention, sampling unit 520 preferably utilizes oversampling＜Over-sampling〉mode the serial audio-visual data is taken a sample, thus, can do repeated sampling, increase to judge the correctness of serial audio-visual data time sequence to same data bit.For example, 3 overtones bands with TMDS channel data position transfer clock frequency carry out oversampling, promptly 30 of pixel clock times.Therefore, the serial audio-visual data bit quantity after the sampling is 3 times of the serial audio-visual data that receives of receiving element 510, and will be temporary in earlier in the buffer 530.The position order and the sampling clock of audio-visual data after the sampling that buffer 530 bases are kept in, output sampling type sample.Because sampling clock is 3 times of TMDS channel bits transfer clock, so takes out one in regular turn every 3 positions in the serial audio-visual data of buffer 530 after sampling, takes out 10 positions altogether, exports a sampling type sample to comparing unit 540.Comparing unit 540 is used for comparison sampling type sample and control signal period 4 groups default type samples.If conforming to, comparative result then exports sequential decision unit 550 to; If comparative result does not conform to, then the next bit of this serial audio-visual data of sampling begins in buffer 530, takes out another sampling type sample in regular turn, compares with 4 groups of default type samples of control signal period, repeat such step, till comparative result conforms to always.The position of sampling type sample start bit in buffer 530 that sequential decision unit 550 conforms to according to comparative result, the sequential of decision audio-visual data.At last, adjust the sequential of audio-visual data, and export correct serial audio-visual data for decoder decode by output unit 560.In addition, the comparative result that conforms to when comparing unit 540 output is during to sequential decision unit 550, buffer 530 can be preferably according to the pairing sampling clock of this sampling type sample as a benchmark sampling clock, this audio-visual data after this sampling is taken a sample, export a plurality of sampling type samples, by comparing unit 540 relatively these a plurality of sampling type samples with should default type sample, by repeating the mode of comparison, increase the accuracy of judging controlled area type sample, so that the sequential of this audio-visual data is judged in sequential decision unit 540.
In sum, the present invention proposes a kind of audio-visual data time sequence determination methods and relevant apparatus thereof that is used for high-density multimedia interface, utilize the sequential of the controlled area type sample judgement audio-visual data of serial audio-visual data in the TMDS channel, so that the display decoding device can correctly restore desired audio-visual data from a plurality of audio-visual data transmission channels, and and then increase the convenience of hardware designer.
The above only is the preferred embodiments of the present invention, and all equivalences of carrying out according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (22)
1. audio-visual data processing method that is used for a high-density multimedia interface includes:
Receive audio-visual data;
According to a sampling clock, this audio-visual data of taking a sample;
According to this audio-visual data and this sampling clock after the sampling, export a sampling type sample;
Relatively this sampling type sample and a plurality of default type sample;
When this sampling type sample conforms to a default type sample of these a plurality of default type samples, judge the sequential of this audio-visual data; And
According to the sequential of this audio-visual data, export this audio-visual data.
2. audio-visual data processing method as claimed in claim 1, wherein this audio-visual data is by the serial audio-visual data of transition minimized differential signaling coded system transmission.
3. audio-visual data processing method as claimed in claim 1, wherein this sampling clock is many times an of pixel clock of this high-density multimedia interface.
4. audio-visual data processing method as claimed in claim 3, wherein these many times is 30 times.
5. audio-visual data processing method as claimed in claim 1, wherein this sampling type sample comprises 10 positions.
6. audio-visual data processing method as claimed in claim 1 is wherein exported this sampling type sample position order and this sampling clock according to this audio-visual data after taking a sample according to this audio-visual data after the sampling and this sampling clock, exports this sampling type sample.
7. audio-visual data processing method as claimed in claim 1, wherein when conforming to, the default type sample of this sampling type sample and this judges that the sequential of this audio-visual data also comprises:
According to the pairing benchmark sampling clock of this sampling type sample, this audio-visual data after this sampling is taken a sample, export a plurality of sampling type samples; And
Relatively these a plurality of sampling type samples are preset the type sample with this, to judge the sequential of this audio-visual data.
8. audio-visual data processing method as claimed in claim 1, wherein these a plurality of default type samples are corresponding to a plurality of controlled areas type sample of the audio-video form that meets this high-density multimedia interface.
9. audio-visual data processing method as claimed in claim 8, wherein the default type sample of each of these a plurality of default type samples includes 10 positions.
10. audio-visual data processing method as claimed in claim 8, wherein these a plurality of default type samples comprise 4 kinds of type samples altogether.
11. audio-visual data processing method as claimed in claim 1, it also comprises:
When the default type sample of this sampling type sample and this does not conform to,, export another sampling type sample according to this audio-visual data and this sampling clock after this sampling;
Relatively this another sampling type sample and these a plurality of default type samples;
When this another sampling type sample conforms to a default type sample of these a plurality of default type samples, judge the sequential of this audio-visual data; And
According to the sequential of this audio-visual data, export this audio-visual data.
12. one kind is used for a high-density multimedia interface audio-visual data processing unit, it includes:
One receiving element is used for receiving audio-visual data;
One sampling unit is coupled to this receiving element, is used for according to a sampling clock this audio-visual data of taking a sample;
One buffer is coupled to this sampling unit, is used for exporting a sampling type sample according to this audio-visual data after this sampling and this sampling clock;
One comparing unit is coupled to this buffer, is used for relatively this sampling type sample and a plurality of default type sample;
One sequential decision unit is coupled to this comparing unit, is used for comparative result according to this comparing unit, when this sampling type sample and one of these a plurality of default type samples are preset the type sample and conformed to, judges the sequential of this audio-visual data; And
One output unit is coupled to this buffer and this sequential decision unit, is used for sequential according to this audio-visual data, exports this audio-visual data.
13. data processing equipment as claimed in claim 12, wherein this audio-visual data refers to utilize the serial audio-visual data of transition minimized differential signaling coded system transmission.
14. data processing equipment as claimed in claim 12, wherein this sampling clock is many times an of pixel clock of this high-density multimedia interface.
15. data processing equipment as claimed in claim 14, wherein these many times is 30 times.
16. data processing equipment as claimed in claim 12, wherein this sampling type sample comprises 10 positions.
17. data processing equipment as claimed in claim 12, wherein this buffer is used for position order and this sampling clock according to this audio-visual data after the sampling, exports this sampling type sample.
18. data processing equipment as claimed in claim 12, wherein when the default type sample of this sampling type sample and this conforms to, this buffer is according to the pairing benchmark sampling clock of this sampling type sample, this audio-visual data after this sampling is taken a sample, export a plurality of sampling type samples, and this comparing unit in order to these a plurality of sampling type samples relatively with should default type sample so that the sequential of this this audio-visual data of sequential decision unit judges.
19. data processing equipment as claimed in claim 12, wherein these a plurality of default type samples are corresponding to a plurality of controlled areas type sample of the audio-video form that meets this high-density multimedia interface.
20. data processing equipment as claimed in claim 12, wherein the default type sample of each of these a plurality of default type samples includes 10 positions.
21. data processing equipment as claimed in claim 12, wherein these a plurality of default type samples comprise 4 kinds of type samples altogether.
22. data processing equipment as claimed in claim 12, wherein this buffer is used for according to this audio-visual data and this sampling clock after this sampling, exporting another sampling type sample in addition when the default type sample of this sampling type sample and this does not conform to.
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| CN107147863A (en) * | 2017-06-08 | 2017-09-08 | 晶晨半导体(上海)股份有限公司 | It is a kind of to reduce the method that high-definition interface is disturbed wireless signal |
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| CN107147863A (en) * | 2017-06-08 | 2017-09-08 | 晶晨半导体(上海)股份有限公司 | It is a kind of to reduce the method that high-definition interface is disturbed wireless signal |
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