CN107483862A - A kind of signal switching method and system - Google Patents
A kind of signal switching method and system Download PDFInfo
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- CN107483862A CN107483862A CN201710851499.0A CN201710851499A CN107483862A CN 107483862 A CN107483862 A CN 107483862A CN 201710851499 A CN201710851499 A CN 201710851499A CN 107483862 A CN107483862 A CN 107483862A
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- 238000012545 processing Methods 0.000 claims abstract description 17
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- 238000001514 detection method Methods 0.000 claims description 14
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- 238000005516 engineering process Methods 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The present invention proposes a kind of signal switching method, including：Receive multichannel HDMI analog signals；Data signal will be respectively converted into per the analog signal in each data channel of HDMI analog signals all the way, obtains multichannel HDMI data signals；Selected from multichannel HDMI data signals all the way HDMI data signals as echo signal；Alignment of data processing, the echo signal after being alignd are carried out to the data in each data channel of echo signal respectively；Processing is synchronized to the data in each data channel of the echo signal after alignment, obtains the echo signal after synchronization；Echo signal after synchronization is converted into analog signal and exported.Easily high-definition signal hand-off process can be realized under relatively low technological level using the above method.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to a kind of signal switching method and system.
Background technology
With the continuous development of electronics technology, also more and more higher, more people start to select high definition for requirement of the spectators to image quality
TV even ultra high-definition TV, such as 4K TVs.
HDMI (High-Definition Media Interface, HDMI) can transmit superelevation
Clear signal, such as 4K signals, 8K signals, this ultra high-definition signal has without compression, lossless high-resolution and real-time characteristic,
Can be that user brings the audition of high-quality to experience.For example having supported 4K30Hz in HDMI1.4 versions, HDMI2.0 is by frame
Data have brought up to 4K60Hz, and it makes picture more smooth, and this is also the increased result of transmission rate.
For display device, when have multichannel HDMI2.0 signals input when, can only therefrom select all the way signal broadcast
Display is put, that is, needs to realize that signal switches.Because HDMI2.0 requires that digital circuit operates in 600MHz, wanted to reach this
Ask, it is necessary to which the flow in the technique of deep-submicron, the cost of this technique is very high, and realizes complexity, if using this technique
Realize that signal switches the process costs, it is necessary to very high, and development difficulty is very big.
The content of the invention
The defects of based on above-mentioned prior art and deficiency, the present invention propose a kind of signal switching method and system, Neng Gou
The signal switching of simplicity is realized under relatively low process costs.
To achieve the above object, the present invention provides following technical scheme：
A kind of signal switching method, including：
Receive multichannel HDMI analog signals；
By believing per the simulation in each data channel of HDMI analog signals all the way in the multichannel HDMI analog signals
Number data signal is respectively converted into, obtains multichannel HDMI data signals；Wherein, the form of the data signal is that each clock is defeated
Go out the data of N number of byte, and present clock period is N times of standard clock cycle, the N is the positive integer more than 1；
Selected from the multichannel HDMI data signals all the way HDMI data signals as echo signal；
Alignment of data processing is carried out to the data in each data channel of the echo signal respectively, after being alignd
Echo signal；
Channel Synchronous processing is carried out to the data in each data channel of the echo signal after the alignment, obtains synchronization
Echo signal afterwards；
Echo signal after the synchronization is converted into analog signal and exported.
Preferably, the data in each data channel of the echo signal after to the alignment synchronize processing, obtain
After echo signal after to synchronization, this method also includes：
Count the error count that the echo signal after the synchronization occurs in preset time period；
When the error count exceeds predetermined threshold value, output interrupt signal makes the outside to outside micro-control unit
Micro-control unit controls source resends HDMI analog signals.
Preferably, the error count that the echo signal after the statistics synchronization occurs in preset time period, including：
The data counted respectively in each data channel of the echo signal after the synchronization occur in preset time period
Number of errors；
The number of errors that data in each data channel are occurred in preset time period carries out summation process, obtains
The error count that echo signal after to the synchronization occurs in preset time period.
Preferably, this method also includes：
Obtain Current standards clock and data rate ratio and scrambling are enabled, and real-time update.
Preferably, this method also includes：
Whether the cycle for detecting present clock is N times of standard clock cycle.
A kind of signal switching system, including：
Data sink, for receiving multichannel HDMI analog signals；By in the multichannel HDMI analog signals per all the way
Analog signal in each data channel of HDMI analog signals is respectively converted into data signal, obtains multichannel HDMI numeral letters
Number；Wherein, the form of the data signal is the data that each clock exports N number of byte, and when present clock period is standard
N times of clock cycle, the N are the positive integer more than 1；
Data selector, for selected from the multichannel HDMI data signals all the way HDMI data signals as target believe
Number；
Alignment of data module, for carrying out alignment of data to the data in each data channel of the echo signal respectively
Processing, the echo signal after being alignd；
Channel Synchronous module, enter row of channels for the data in each data channel to the echo signal after the alignment
Synchronization process, obtain the echo signal after synchronization；
Data transmitter, for the echo signal after the synchronization to be converted into analog signal and exported.
Preferably, the system also includes：
Error detection module, the echo signal after counting the synchronization occur in preset time period mistake based on
Number；When the error count exceeds predetermined threshold value, output interrupt signal to outside micro-control unit, make the outside microcontroller
Unit control source resends HDMI analog signals.
Preferably, the error detection module counts the mistake that the echo signal after the synchronization occurs in preset time period
During miscount, it is specifically used for：
The data counted respectively in each data channel of the echo signal after the synchronization occur in preset time period
Number of errors；The number of errors that data in each data channel occur in preset time period is carried out at summation
Reason, obtains the error count that the echo signal after the synchronization occurs in preset time period.
Preferably, the system also includes：
State and control data channel module, it is enabled for obtaining Current standards clock and data rate ratio and scrambling,
And real-time update.
Preferably, the system also includes：
Clock detection module, whether the cycle for detecting present clock is N times of standard clock cycle.
Signal switching method proposed by the present invention, multichannel HDMI analog signals are received, and the multichannel HDMI is simulated and believed
Data signal is respectively converted into per the analog signal in each data channel of HDMI analog signals all the way in number, obtains multichannel
HDMI data signals；Wherein, the form of the data signal is the data that each clock exports N number of byte, and present clock is all
Phase is N times of standard clock cycle, and the N is the positive integer more than 1；Then one is selected from the multichannel HDMI data signals
Road HDMI data signals are as echo signal；Data pair are carried out to the data in each data channel of the echo signal respectively
The processing of neat and Channel Synchronous, obtains the echo signal after synchronization；The echo signal after the synchronization is finally converted into simulation
Signal simultaneously exports.The form for setting data signal in the present invention exports the data of N number of byte, and present clock as each clock
Cycle is N times of standard clock cycle, can reduce digital clock frequencies, the transmission of signal can be realized under relatively low technique,
Multiple signals switching is being realized on this basis, the requirement to technique is being reduced, realizes easier.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of schematic flow sheet of signal switching method provided in an embodiment of the present invention；
Fig. 2 is the schematic flow sheet of another signal switching method provided in an embodiment of the present invention；
Fig. 3 is a kind of structural representation of signal switching system provided in an embodiment of the present invention；
Fig. 4 is the structural representation of another signal switching system provided in an embodiment of the present invention；
Fig. 5 is the structural representation of another signal switching system provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Shown in Figure 1 the embodiment of the invention discloses a kind of signal switching method, this method includes：
S101, receive multichannel HDMI analog signals；
Specifically, technical scheme of the embodiment of the present invention be used for selected from multichannel HDMI signals all the way signal be supplied to display
Equipment is shown.Therefore, in data source, while multichannel HDMI analog signal outputs are provided, multiple data receivers is set accordingly
Device receives multichannel HDMI analog signals, and the quantity of data sink is identical with HDMI analog signal numbers.
S102, by the multichannel HDMI analog signals per the mould in each data channel of HDMI analog signals all the way
Intend signal and be respectively converted into data signal, obtain multichannel HDMI data signals；Wherein, when the form of the data signal is each
Clock exports the data of N number of byte, and present clock period is N times of standard clock cycle, and the N is the positive integer more than 1；
Specifically, HDMI (High Definition Multimedia Interface, HDMI)
There are three data channel, transmission is to minimize differential signal transmission (Transition-minimized differential
Signaling, TMDS), TMDS is analog signal.The analog signal of each data channel is converted into data signal, form is
Each clock exports N number of pixel (pixel is equal to the data of a byte), and present clock period is standard time clock
N times of cycle, N are greater than 1 positive integer.Point out that bandwidth range is in standard time clock=TMDS Clock, HDMI1.4 specifications
Rbit<=3.4Gbps, 4K30Hz resolution ratio can be supported, then the TMDS Clock=under the specification (TMDS bit period)/
(TMDS clock period)ratio is 1/10.It is 3.4Gbps that bandwidth range is pointed out in HDMI2.0 specifications<Rbit<=
6Gbps, 4K60Hz resolution ratio can be supported, then the TMDS Clock=under the specification (TMDS bit period)/(TMDS
clock period)ratio is 1/40。
The analog signal of each passage is converted to by data signal by data sink, form is that each clock exports N
Individual pixel, and present clock period is N times of standard clock cycle, N is greater than 1 positive integer, can reduce digital dock
Frequency, HDMI2.0 transmission under relatively low technique, can be realized.Specifically, when HDMI2.0 sends 4K60Hz image in different resolution,
Digital dock reaches 594Mhz (each TMDS clock sampling 10bit data), very high to technological requirement.When data sink
When string turns and form is changed into each TMDS clock samplings 20bit data, TMDS clocks only need 297Mhz.Similarly string is turned simultaneously
When form is changed into N times, TMDS clocks only need original 1/N.It can be seen that setting of the embodiment of the present invention to digital signals format,
Clock frequency can be reduced, so as to reduce requirement of the signal transacting to technique, reduces development difficulty.
S103, select from the multichannel HDMI data signals all the way HDMI data signals as echo signal；
Specifically, the embodiment of the present invention sets data selector, realize and signal use all the way is selected from multichannel HDMI signals
Shown in follow-up play.Further, the embodiment of the present invention use M select a data selector (M for receive HDMI signal numbers
Amount), select signal all the way from multichannel HDMI signals.
It should be noted that specific signal behavior rule, can be set according to the actual requirements.As long as energy in theory
Realization selects all the way from multichannel HDMI signals.
S104, alignment of data processing is carried out to the data in each data channel of the echo signal respectively, obtained pair
Echo signal after neat；
Specifically, HDMI1.4 codings define three cycles：Video data Period (video data cycle), Data
Island Period (packet cycle) and Control Period (controlling cycle), different cycles have corresponded to different codings
Mode.HDMI2.0 coded system has a very big change, but HDMI2.0 SSCP (Scrambler synchronization
Control period, scrambling synchronization controlling cycle) it is consistent with HDMI1.4 Control Period coded systems, all use
Maximum coded system, the embodiment of the present invention is according to the encoded radio of the Control Period by each data channel of echo signal
Alignment of data.Value after Control Period data encoding only has 4 kinds of numerical value：10’h354,10’hAB,10’h154,
10’h2AB.By finding these fixed numbers from data flow, as long as detecting any one of this 4 numerical value, you can by number
According to alignment.
S105, Channel Synchronous processing is carried out to the data in each data channel of the echo signal after the alignment, obtained
Echo signal after to synchronization；
Specifically, can be according to the leading edge position of Control Period encoded radio, by the echo signal after alignment
Data in each data channel carry out Channel Synchronous.HDMI2.0 SSCP and HDMI1.4 controlling cycle coded system phase
Together, all using maximum coded system (number of 0 and 1 upset is more than or equal to 7), the 0 of other cycles and 1 upset number is both less than etc.
(0 to 1 or 1 to 0 represents once inside out, and upset number adds 1 in 5；0 to 0 or 1 to 1, upset number is constant, counts 10bit
Value the inside overturns altogether number).Such as：Result after the data encoding of controlling cycle only has 4 values：10’b1101010100
(upset number is 7), 10 ' b0010101011 (upset number is 7), 10 ' b0101010100 (upset number is 8), 10 '
B1010101011 (upset number is 8).0 and 1 upset number of three data channel is detected respectively from more than or equal to 7, is changed into small
In the switching hopping edge (rising edge or trailing edge) equal to 5, then the above-mentioned switching hopping edge of 3 passages is alignd.
S106, the echo signal after the synchronization is converted into analog signal and exported.
Specifically, after the embodiment of the present invention realizes data selection and alignment, synchronization process, signal is again converted to mould
Intend signal to show for display device.
The signal switching method that the embodiment of the present invention proposes, multichannel HDMI analog signals are received, and by the multichannel HDMI
Data signal is respectively converted into per the analog signal in each data channel of HDMI analog signals all the way in analog signal, is obtained
To multichannel HDMI data signals；Wherein, the form of the data signal is the data that each clock exports N number of byte, and currently
Clock cycle is N times of standard clock cycle, and the N is the positive integer more than 1；Then from the multichannel HDMI data signals
Selection all the way HDMI data signals as echo signal；The data in each data channel of the echo signal are carried out respectively
Alignment of data and Channel Synchronous processing, obtain the echo signal after synchronization；Finally the echo signal after the synchronization is changed
For analog signal and export.The form for setting data signal in the present invention exports the data of N number of byte as each clock, and works as
The preceding clock cycle is N times of standard clock cycle, can reduce digital clock frequencies, can realize signal under relatively low technique
Transmission, multiple signals switching is being realized on this basis, is reducing the requirement to technique, is being realized easy.
Optionally, in another embodiment of the present invention, it is shown in Figure 2, the echo signal after to the alignment
Each data channel in data synchronize processing, after obtaining the echo signal after synchronization, this method also includes：
The error count that echo signal after S206, the statistics synchronization occurs in preset time period；
When the error count exceeds predetermined threshold value, step S207, output interrupt signal to outside microcontroller list are performed
Member, the outside micro-control unit controls source is set to resend HDMI analog signals.
Wherein, the error count that the echo signal after the statistics synchronization occurs in preset time period, including：
The data counted respectively in each data channel of the echo signal after the synchronization occur in preset time period
Number of errors；
The number of errors that data in each data channel are occurred in preset time period carries out summation process, obtains
The error count that echo signal after to the synchronization occurs in preset time period.
Specifically, HDMI2.0SPEC (Software Requirement Specification, software-implemented fault injection book)
Provide error detection look-up table, the embodiment of the present invention by data just effectively, bear effect and 0 effective look-up table, detection in real time
Whether the numerical value of each data channel meets standard, if not being inconsistent standardization, illustrates the numerical fault, often detects a mistake
By mistake, counter adds 1, and the error counter of statistics is output into read-only register per 10ms, the total mistake of all passages in every 10ms
When miscount exceeds threshold value (register can configure), and output interrupt signal to outside MCU (Microcontroller Unit, it is micro-
Control unit) to notify Source (source, the present embodiment in can be understood as TMDS transmitting terminals), re-start
Calibration (calibration) is simultaneously exported the signal after calibration by three data channel, to ensure that signal transmission is correct.
The step in the embodiment of the method shown in step S201~S205, S208 difference corresponding diagram 1 in the present embodiment
S101~S105, S106, its particular content refer to the content of the embodiment of the method shown in corresponding diagram 1, and here is omitted.
Optionally, in another embodiment of the present invention, this method also includes：
Obtain Current standards clock and data rate ratio and scrambling are enabled, and real-time update.
Specifically, HDMI2.0SCDC (State and control data can be monitored according to HDMI DDC communication protocols
Channel, state and control data passage) TMDS configuration registers, obtain current TMDS clocks and data rate ratio and
Scrambling is enabled, and real-time update.Obtain Current standards clock and data rate ratio and scrambling are enabled, it may be determined that source is sent
Be HDMI1.4 data or HDMI2.0 data.
Optionally, in another embodiment of the present invention, this method also includes：
Whether the cycle for detecting present clock is N times of standard clock cycle.
Specifically, the embodiment of the present invention periodically generates 1ms pulse high level using crystal oscillator clock, then real-time statistics
The count value K of clock to be measured in this 1ms, according to the size of K values, calculate the cycle of clock to be measured.Such as：Clock frequency to be measured
For 50Mhz, then the clock count K of statistics is 50000 in 1ms.Current clock frequency counter can be pushed away by K value, further,
Whether the cycle that can confirm that present clock is N times of standard clock cycle.
Shown in Figure 3 the embodiment of the invention also discloses a kind of signal switching system, the system includes：
Data sink 100, for receiving multichannel HDMI analog signals；Will be each in the multichannel HDMI analog signals
Analog signal in each data channel of road HDMI analog signals is respectively converted into data signal, obtains multichannel HDMI numeral letters
Number；Wherein, the form of the data signal is the data that each clock exports N number of byte, and when present clock period is standard
N times of clock cycle, the N are the positive integer more than 1；
Data selector 110, for selected from the multichannel HDMI data signals all the way HDMI data signals as mesh
Mark signal；
Alignment of data module 120, for carrying out data to the data in each data channel of the echo signal respectively
Registration process, the echo signal after being alignd；
Channel Synchronous module 130, carried out for the data in each data channel to the echo signal after the alignment
Channel Synchronous processing, obtains the echo signal after synchronization；
Data transmitter 140, for the echo signal after the synchronization to be converted into analog signal and exported.
Specifically, in the present embodiment unit specific works content, refer to the content of above method embodiment, this
Place repeats no more.
Optionally, in another embodiment of the present invention, shown in Figure 4, the system also includes：
Error detection module 150, the mistake occurred for counting the echo signal after the synchronization in preset time period
Count；When the error count exceeds predetermined threshold value, output interrupt signal to outside micro-control unit, make the outside micro-control
Unit control source processed resends HDMI analog signals.
Specifically, the specific works content of the error detection module 150 in the present embodiment, refers to above method embodiment
Content, here is omitted.
Optionally, in another embodiment of the present invention, the error detection module 150 counts the mesh after the synchronization
During the error count that mark signal occurs in preset time period, it is specifically used for：
The data counted respectively in each data channel of the echo signal after the synchronization occur in preset time period
Number of errors；The number of errors that data in each data channel occur in preset time period is carried out at summation
Reason, obtains the error count that the echo signal after the synchronization occurs in preset time period.
Specifically, the specific works content of the error detection module 150 in the present embodiment, refers to above method embodiment
Content, here is omitted.
Optionally, in another embodiment of the present invention, shown in Figure 5, the system also includes：
State and control data channel module (SCDC modules) 160, for obtaining Current standards clock and data rate ratio
Value and scrambling are enabled, and real-time update.
Specifically, the specific works content of the state and control data channel module 160 in the present embodiment, is referred to above-mentioned
The content of embodiment of the method, here is omitted.
Optionally, in another embodiment of the present invention, shown in Figure 5, the system also includes：
Clock detection module 170, whether the cycle for detecting present clock is N times of standard clock cycle.
Specifically, the specific works content of the clock detection module 170 in the present embodiment, refers to above method embodiment
Content, here is omitted.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty
Technical staff can realize described function using distinct methods to each specific application, but this realization should not
Think beyond the scope of this invention.
Directly it can be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
- A kind of 1. signal switching method, it is characterised in that including：Receive multichannel HDMI analog signals；By dividing per the analog signal in each data channel of HDMI analog signals all the way in the multichannel HDMI analog signals Data signal is not converted to, obtains multichannel HDMI data signals；Wherein, the form of the data signal is that each clock exports N The data of individual byte, and present clock period is N times of standard clock cycle, the N is the positive integer more than 1；Selected from the multichannel HDMI data signals all the way HDMI data signals as echo signal；Alignment of data processing, the target after being alignd are carried out to the data in each data channel of the echo signal respectively Signal；Channel Synchronous processing is carried out to the data in each data channel of the echo signal after the alignment, after obtaining synchronization Echo signal；Echo signal after the synchronization is converted into analog signal and exported.
- 2. according to the method for claim 1, it is characterised in that each data of the echo signal after to the alignment are led to Data in road synchronize processing, and after obtaining the echo signal after synchronization, this method also includes：Count the error count that the echo signal after the synchronization occurs in preset time period；When the error count exceeds predetermined threshold value, output interrupt signal to outside micro-control unit, make the outside micro-control Unit control source processed resends HDMI analog signals.
- 3. according to the method for claim 2, it is characterised in that echo signal after the statistics synchronization is when default Between the error count that occurs in section, including：The mistake that the data in each data channel of the echo signal after the synchronization occur in preset time period is counted respectively Quantity by mistake；The number of errors that data in each data channel are occurred in preset time period carries out summation process, obtains institute State the error count that the echo signal after synchronization occurs in preset time period.
- 4. according to the method for claim 1, it is characterised in that this method also includes：Obtain Current standards clock and data rate ratio and scrambling are enabled, and real-time update.
- 5. according to the method for claim 1, it is characterised in that this method also includes：Whether the cycle for detecting present clock is N times of standard clock cycle.
- A kind of 6. signal switching system, it is characterised in that including：Data sink, for receiving multichannel HDMI analog signals；By every HDMI all the way in the multichannel HDMI analog signals Analog signal in each data channel of analog signal is respectively converted into data signal, obtains multichannel HDMI data signals；Its In, the form of the data signal exports the data of N number of byte for each clock, and present clock period is standard clock cycle N times, the N is positive integer more than 1；Data selector, for selected from the multichannel HDMI data signals all the way HDMI data signals as echo signal；Alignment of data module, for being carried out respectively to the data in each data channel of the echo signal at alignment of data Reason, the echo signal after being alignd；Channel Synchronous module, Channel Synchronous is carried out for the data in each data channel to the echo signal after the alignment Processing, obtains the echo signal after synchronization；Data transmitter, for the echo signal after the synchronization to be converted into analog signal and exported.
- 7. system according to claim 6, it is characterised in that the system also includes：Error detection module, the error count occurred for counting the echo signal after the synchronization in preset time period；When When the error count exceeds predetermined threshold value, output interrupt signal to outside micro-control unit, make the outside micro-control unit Control source resends HDMI analog signals.
- 8. system according to claim 6, it is characterised in that the error detection module counts the target after the synchronization During the error count that signal occurs in preset time period, it is specifically used for：The mistake that the data in each data channel of the echo signal after the synchronization occur in preset time period is counted respectively Quantity by mistake；The number of errors that data in each data channel are occurred in preset time period carries out summation process, obtains The error count that echo signal after to the synchronization occurs in preset time period.
- 9. system according to claim 6, it is characterised in that the system also includes：State and control data channel module, it is enabled for obtaining Current standards clock and data rate ratio and scrambling, and in fact Shi Gengxin.
- 10. system according to claim 6, it is characterised in that the system also includes：Clock detection module, whether the cycle for detecting present clock is N times of standard clock cycle.
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