CN105472287A - Device and method for single-path to multiple-path conversion of single path of HDMI video signals - Google Patents
Device and method for single-path to multiple-path conversion of single path of HDMI video signals Download PDFInfo
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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
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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Abstract
The invention discloses a device and a method for single-path to multiple-path conversion of HDMI video signals. The device comprises a man-machine interface module, an HDMI video receiving module, an HDMI protocol module, an HDMI video decoding module, an HDMI to RGB module, an RGB image resolution detection module, an RGB image caching module and a plurality of HDMI video output modules. The method is based on the device, and is used for reconstructing an HDMI image timing sequence at each local HDMI video output module according to one path of input HDMI video signals, and outputting multiple paths of HDMI image data from each local HDMI video output module to a to-be-tested module according to the timing sequence, thereby realizing a signal expansion function of one-path to multiple-path conversion of the HDMI video signals. The device and the method are suitable for verifying medium and large-scale modules; moreover, each HDMI video output module is parallel and independent, parameters can be adjusted separately, and each path of the HDMI video signals can be output independently and simultaneously, thus, the device and the method are suitable for simultaneously performing screen lighting verification for a mass of modules with the same resolution and different characteristics under different working environments.
Description
Technical field
The invention belongs to signal processing technology field, more specifically, relate to the device and method that a kind of HDMI video signal single channel turns multichannel.
Background technology
HDMI liquid crystal module has been widely used in various display device, has wide in variety, complete in specifications, cheap advantage; Each module manufacturer is also at the various HDMI module of large-scale production.Along with the increase of HDMI liquid crystal module demand, for ensureing HDMI liquid crystal module quality, particularly important to the testing authentication of HDMI liquid crystal module.
Need to use image signal source to be supplied to liquid crystal module to produce benchmark image to the testing authentication of HDMI liquid crystal module, and an existing image signal source often can only supply a small amount of several tested liquid crystal module; And large-scale HDMI liquid crystal module test needs great amount of images signal source, and image signal source is with high costs, and cannot realize testing the module of different qualities under multiple test environment simultaneously, causes production efficiency reduction, production cost raising.
For this reason, need a kind of HDMI video signal extension scheme, the HDMI video signal that can provide according to the image signal source of input, generate the identical HDMI video signal of multichannel and supply the detection of large-scale HDMI liquid crystal module as image signal source; Under being used in different test environments, the checking of same time point screen is carried out to the module of different qualities.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides the device and method that a kind of HDMI video signal single channel turns multichannel, its object is to expansion HDMI video signal source.
For achieving the above object, according to one aspect of the present invention, provide the device that a kind of HDMI video signal single channel turns multichannel, comprise a HDMI video signal input interface, HDMI video control signal input interface, a multiple HDMI video signal output interface, and solidify HDMI video decoder module in a programmable logic device, HDMI protocol module, HDMI turn RGB module, RGB image resolution ratio detection module, rgb image data cache module and multiple HDMI video output module;
This programmable logic device has the HDMI video signal input terminal coupling above-mentioned HDMI video signal input interface, the HDMI video control signal input terminal coupling above-mentioned HDMI video control signal input interface and couples multiple HDMI video signal output terminals of above-mentioned multiple HDMI video signal output interface one by one;
Wherein, HDMI protocol module is connected with HDMI video decoder module, HDMI video decoder module and HDMI turn RGB model calling, HDMI turns RGB module and is connected with RGB image resolution ratio detection module and rgb image data cache module, and RGB image resolution ratio detection module is connected with each HDMI video output module with rgb image data cache module; Each HDMI video output module is parallel independent, noiseless each other, and can respective independent parameters;
HDMI video decoder module couples described HDMI video signal input interface by HDMI video signal input terminal, and HDMI protocol module and each HDMI video output module all couple described video control signal input interface by HDMI video control signal input terminal; Each HDMI video output module has multiple passage HDMI video signal output part, each passage HDMI video signal output part couples HDMI video signal output interface by HDMI video signal output terminal, by HDMI video signal output interface HDMI video signal is sent to the HDMI liquid crystal module to be measured in respective channel.
Preferably, above-mentioned HDMI video signal single channel turns the device of multichannel, also comprises human-machine interface module; Human-machine interface module has outside display interface and external command input interface; This human-computer interaction module is used for generating HDMI video control signal according to external command, is sent to HDMI protocol module and each HDMI video output module by HDMI video control signal input terminal; Also for the state information of whole device is exported by outside display interface.
Preferably, above-mentioned HDMI video signal single channel turns the device of multichannel, also comprises HDMI video receiver module; This HDMI video receiver module solidifies in above-mentioned programmable logic device, its first end couples described HDMI video signal input interface by described HDMI video signal input terminal, second end connects above-mentioned human-computer interaction module by above-mentioned HDMI video control signal input terminal, and the 3rd end is connected with above-mentioned HDMI video decoder module; HDMI video receiver module be used for the HDMI video signal received from image signal source is electrically adjusted, time delay adjust and demodulation process, obtain the parallel demodulation data of each passage.
Preferably, above-mentioned HDMI video signal single channel turns the device of multichannel, and its HDMI video receiver module comprises reception matching module, electrically rebuilds module, time delay alignment module and demodulation module;
Wherein, receive matching module and electrically rebuild model calling, electric rebuild module and be connected with time delay alignment module, time delay alignment module is connected with demodulation module; Receive the input of matching module as the first end of HDMI video receiver module, the output of demodulation module is as the 3rd end of HDMI video receiver module; Receive matching module control end, electrically rebuild the control end of module controls end, time delay alignment module control end and demodulation module side by side as the second end of HDMI video receiver module;
Wherein, receive matching module to be used for being terminated and impedance matching to the HDMI video signal of reception; Electric reconstruction module is used for adjudicating according to electrical standard the output signal receiving matching module and regenerating, and obtains the HDMI signal with standard electrical characteristic; Time delay alignment module, for the clock signal of each passage HDMI signal inside of aliging and data-signal, makes between the data-signal of each channel interior, aligns between data-signal and clock signal; The data-signal that demodulation module adopts the clock signal of each passage parallel to each is sampled and demodulation, obtains the parallel demodulation bus data of each passage.
Preferably, above-mentioned reception matching module comprises multiple reception matched sub-block, and electrically reconstruction module comprises multiple electric reconstruction submodule, time delay alignment module comprises multiple time delay alignment submodule, demodulation module comprises multiple demodulation submodule; Receive matched sub-block, electrically rebuild submodule, time delay alignment submodule is identical with the number of demodulation submodule.
Preferably, each demodulation submodule has self-calibration function, can carry out self calibration, clock can correctly be sampled and each data-signal of demodulation, the error avoiding external environmental interference to cause and drift according to the alignment time interval arranged; When the interference of certain passage is more serious, the interval of calibration of the demodulation submodule that this passage is corresponding arranges shorter, to improve the reliability of demodulation operation.
Preferably, above-mentioned HDMI video signal single channel turns the device of multichannel, and its HDMI video output module comprises local image sequence generation module, output channel view data cache module, RGB image generating module, HDMI encrypting module, HDMI video signal conversion module, HDMI time delay adjusting module and HDMI signal driver module;
Wherein, local image sequence generation module is all connected with RGB image generating module with output channel view data cache module, RGB image generating module is all connected with HDMI video signal conversion module with HDMI encrypting module, HDMI video signal conversion module is connected with HDMI time delay adjusting module, and HDMI time delay adjusting module is connected with HDMI signal driver module; The input of local image sequence generation module, as the second end of HDMI video output module, connects RGB image resolution ratio detection module; The input of output channel view data cache module, as the 3rd end of HDMI video output module, connects rgb image data cache module; The output of HDMI signal driver module is as the HDMI video signal output part of HDMI video output module;
Wherein, local image sequence generation module is for obtaining the some screen clock signal of HDMI liquid crystal module to be measured in respective channel according to the resolution of benchmark image and HDMI liquid crystal module time sequence parameter to be measured; Output channel view data cache module is used for caching image data; RGB image generating module is used for the view data receiving buffer memory according to above-mentioned some screen clock signal, produces the screen of the point needed for the module to be measured RGB picture signal of respective channel;
Above-mentioned some screen RGB picture signal is converted to HDMI video signal by HDMI video signal conversion module, the data of each passage are split, recombinated, bit rearrangement, generate the HDMI parallel data of each output channel, and under the effect of HDMI encrypting module, this HDMI parallel data is encrypted; HDMI time delay adjusting module is used for adjusting the clock of output channel inside and the time delay of data-signal, makes the HDMI signal of each passage can arrive module to be measured after cable simultaneously; HDMI signal driver module is for adjusting output electrical characteristic and the transmission characteristic of the HDMI video signal of each passage.
Preferably, above-mentioned HDMI video signal single channel turns the device of multichannel, its HDMI video output module also comprises HDMI signalling channel hot plug module, this HDMI signalling channel hot plug module is connected with HDMI signal driver module, and its output is as the HDMI video signal output part of HDMI video output module; Described HDMI video signal output interface, under the effect of this HDMI signalling channel hot plug module, supports warm connection function.
Preferably, above-mentioned each HDMI video output module all can separate configurations HDMI video coding parameter and transformation parameter; According to a road HDMI video signal of input, the multichannel HDMI video signal with different qualities can be generated; Can be used for supplying simultaneously and multiplely there is equal resolution and there is the HDMI liquid crystal module of different display characteristic.
For realizing the object of the invention, according to another aspect of the present invention, providing a kind of method that HDMI video signal single channel turns multichannel, comprising the steps:
(1) HDMI agreement is resolved, produce HDMI group bag data;
(2) according to decoding relevant parameter and HDMI group bag data, HDMI parallel demodulation bus data to be decoded, union operation, recover the HDMI benchmark image signal of image signal source;
Wherein, decoding relevant parameter comprises VESA, JEIDA transmission standard, 6 ~ 10bit image tonescale, synchronizing signal forward and reverse, transmission channel number;
(3) above-mentioned HDMI benchmark image signal is converted to rgb video signal;
(4) the above-mentioned rgb video signal data of buffer memory; Meanwhile, horizontal resolution and the vertical resolution of its image is gone out according to the synchronization signal detection of benchmark image;
(5) the some screen clock signal of module to be measured corresponding to each passage is obtained according to the time sequence parameter of the resolution of the HDMI benchmark image module to be measured corresponding with output channel; Receive the output channel view data of buffer memory according to this some screen clock signal, and according to the Image Coding parameter of the module to be measured preset, output channel view data is converted to the some screen RGB picture signal that each passage is corresponding;
(6) above-mentioned some screen RGB picture signal is carried out to segmentation, the restructuring of each channel data, bit rearrangement, generates the HDMI parallel data of each output channel; And this HDMI parallel data is encrypted;
(7) adjust the clock of HDMI video signal inside and the time delay of data-signal of each output channel, make the HDMI video signal of all passages all can arrive HDMI liquid crystal module to be measured after stube cable simultaneously.
Preferably, above-mentioned HDMI video signal single channel turns the method for multichannel, also comprises the steps (8) after step (7):
(8) output electrical characteristic and transmission characteristic adjustment are carried out to the HDMI video signal of each passage after time delay adjustment, make the quality of the HDMI video signal of each passage arriving module to be measured and signal amplitude all can reach module and receive requirement; Wherein, output electrical characteristic and transmission characteristic adjustment comprise preemphasis adjustment, the adjustment of driving intensity, the electric range-adjusting of HDMI, Slew Rate adjust and output impedance adjusts.
Preferably, above-mentioned HDMI video signal single channel turns the method for multichannel, also comprises the steps (9) after step (8):
(9) hot plug module is adopted to process the HDMI video signal after step (8) adjustment, the HDMI video signal supporting interface hot plug that each passage is exported.
Preferably, above-mentioned HDMI video signal single channel turns the method for multichannel, and the single channel HDMI video signal of its input is from image signal source; Before step (2), also comprise the HDMI video signal that image signal source is sent and adjust and the step of demodulation, specific as follows:
A () receives the HDMI channel video signals that image signal source sends, be terminated, impedance matching and signal equalization and amplification to the input signal of each passage;
B () is according to HDMI electrical standard, signal decision and reconstruction are carried out to each passage HDMI signal after step (a) adjustment, eliminate input signal overshoot, undershoot and burr, export the HDMI video signal with standard electrical characteristic, to avoid interference the erroneous judgement causing subsequent module;
C () processes the above-mentioned delay had between the clock of each channel interior of HDMI video signal of standard electrical characteristic and data-signal, make to keep between each data-signal, between data-signal with clock signal aliging;
In this step, because the delay variance of each passage is different, the internal clocking of each passage, data delay are adjusted respectively;
D () adopts the clock signal of each passage to sample and demodulation to data-signal parallel in respective channel, obtain the HDMI parallel demodulation bus data of each passage.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) adopt HDMI video signal single channel provided by the invention to turn the apparatus and method of multichannel, according to 1 tunnel HDMI video signal, the HDMI video signal that multichannel is used for the test of a large amount of liquid crystal module point screen can be obtained, realize the expansion to HDMI video signal;
(2) HDMI video signal single channel provided by the invention turns the device of multichannel, carries out Lag synchronization control and signal reconstruction, eliminate the reception mistake because transmission cable and external disturbance may cause to the HDMI video signal of input;
(3) HDMI video signal single channel provided by the invention turns the device of multichannel, multiple output interface can export HDMI video signal simultaneously, and due to each HDMI video output module independence mutually, therefore independent of one another between the HDMI video signal of each road, do not interfere with each other; Each HDMI video output module all can adjust separately image time sequence parameter, HDMI video coded system, HDMI transmission channel number, exports driving, exports transmission characteristic, exports HDMI electrical characteristic, export delay parameter; Be applicable to in a large number there is equal resolution but the discrepant module of characteristic under different operating environment, to carry out some screen checking simultaneously;
(4) HDMI video signal single channel provided by the invention turns the device of multichannel, and each road HDMI video signal of output can use under different operational environments and transmission cable simultaneously; Simple to operate, without the need to other auxiliary equipment, be applicable to large scale test;
(5) HDMI video signal single channel provided by the invention turns the device of multichannel, and FPGA (field programmable logic array) chip can be adopted to realize, and has reliable operation, cheap, the feature of being convenient to later maintenance and upgrading.
Accompanying drawing explanation
Fig. 1 is the functional block diagram that HDMI video signal single channel provided by the invention turns multiple-pass unit;
Fig. 2 is the functional block diagram that HDMI video signal single channel that the embodiment of the present invention provides turns multiple-pass unit;
Fig. 3 is the HDMI video receiver module schematic diagram in the embodiment of the present invention;
Fig. 4 is the HDMI video output module schematic diagram in the embodiment of the present invention;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein: 1-human-machine interface module, 2-receives matching module, 3-electrically rebuilds module, 4-time delay alignment module, 5-demodulation module, 6-HDMI protocol module, 7-HDMI Video decoding module, 8-HDMI turns RGB module, 9-RGB view data cache module, 10-RGB image resolution ratio detection module, the local image sequence generation module of 11-, 12-output channel view data cache module, 13-RGB image generating module, 14-HDMI vision signal modular converter, 15-HDMI encrypting module, 16-HDMI time delay adjusting module, 17-HDMI signal driver module, 18-HDMI signalling channel hot plug module, 2-1-first receives matched sub-block, 2-2-second receives matched sub-block, 2-N-N receives matched sub-block, 3-1-first electrically rebuilds submodule, 3-2-second electrically rebuilds submodule, 3-N-N electrically rebuilds submodule, 4-1-first time delay alignment submodule, 4-2-second time delay alignment submodule, 4-N-N time delay alignment submodule, 5-1-first demodulation submodule, 5-2-second demodulation submodule, 5-N-N demodulation submodule, 16-1-the one HDMI time delay adjustment submodule, 16-2-the 2nd HDMI time delay adjustment submodule, 16-N-NHDMI time delay adjustment submodule, 17-1-the one HDMI signal driven element module, 17-2-the 2nd HDMI signal driven element module, 17-N-NHDMI signal driven element module, 18-1-the one HDMI signalling channel hot plug submodule, 18-2-the 2nd HDMI signalling channel hot plug submodule, 18-N-NHDMI signalling channel hot plug submodule.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
HDMI video signal single channel provided by the invention turns multiple-pass unit, its functional block diagram as shown in Figure 1, comprise a HDMI video signal input interface, HDMI video control signal input interface, a multiple HDMI video signal output interface and solidify HDMI protocol module 6 in programmable logic device, HDMI video decoder module 7, HDMI turn RGB module 8, rgb image data cache module 9, RGB image resolution ratio detection module 10 and multiple HDMI video output module;
Wherein, HDMI protocol module 6 is connected with HDMI video decoder module 7, HDMI video decoder module 7 and HDMI turn RGB module 8 and are connected, HDMI turns RGB module 8 and is connected with RGB image resolution ratio detection module 10 and rgb image data cache module 9, and RGB image resolution ratio detection module 10 is connected with each HDMI video output module with rgb image data cache module 9; Each HDMI video output module is parallel independent, noiseless each other, and can respective independent parameters;
Wherein, HDMI video decoder module 7 couples described HDMI video signal input interface by HDMI video signal input terminal, and HDMI protocol module 6 and each HDMI video output module all couple described video control signal input interface by HDMI video control signal input terminal; Each HDMI video output module has multiple passage HDMI video signal output part, each passage HDMI video signal output part couples HDMI video signal output interface by HDMI video signal output terminal, by HDMI video signal output interface HDMI video signal is sent to the HDMI liquid crystal module to be measured in respective channel.
Shown in Fig. 2, be the functional block diagram that HDMI video signal single channel that the embodiment of the present invention provides turns multiple-pass unit, comprise human-machine interface module 1, HDMI protocol module 6, HDMI video decoder module 7, HDMI turn RGB module 8, rgb image data cache module 9, RGB image resolution ratio detection module 10 and multiple HDMI video output module;
In the present embodiment, the functional block diagram of HDMI video receiver module as shown in Figure 3, comprises and receives matching module 2, electrically reconstruction module 3, time delay alignment module 4 and demodulation module 5; Receive matching module and comprise N number of reception matched sub-block 2-1 ~ 2-N, electric reconstruction module comprises N number of electric reconstruction submodule 3-1 ~ 3-N, time delay alignment module comprises N number of time delay alignment submodule 4-1 ~ 4-N, and demodulation module comprises N number of demodulation submodule 5-1 ~ 5-N.
In the present embodiment, the functional block diagram of the HDMI video output module of respective channel 1 as shown in Figure 4, comprises local image sequence generation module 11, output channel view data cache module 12, RGB image generating module 13, HDMI video signal conversion module 14, HDMI encrypting module 15, HDMI time delay adjusting module 16, HDMI signal driver module 17 and HDMI signalling channel hot plug module 18; HDMI time delay adjusting module 16 comprises N number of HDMI time delay adjustment submodule 16-1 ~ 16-N, HDMI signal driver module 17 comprises N number of HDMI signal driven element module 17-1 ~ 17-N, HDMI signalling channel hot plug module 18 and comprises N number of HDMI signalling channel hot plug submodule 18-1 ~ 18-N; Wherein, N is greater than 2.
The HDMI video signal single channel provided based on the present embodiment turns multiple-pass unit, and realizing HDMI video signal single channel, to turn the process of multichannel specific as follows:
(1) outside HDMI video signal input parameter and Ge Lu output HDMI video signal parameter is received by human-machine interface module 1; Above-mentioned each Parameter Switch is become HDMI video control signal by human-machine interface module 1;
(2) receive the HDMI channel video signals that matching module 2 receives image signal source transmission, receive each submodule corresponding HDMI video signal receiving each passage respectively of matching module 2; In embodiment, submodule 2-1 respective channel 0, submodule 2-2 respective channel 1 ..., submodule 2-N respective channel (N-1);
Each submodule is terminated and impedance matching to the HDMI video signal of each passage respectively; Under complicated environment for use, transmission characteristic and the suffered interference of the transmission cable of each passage are inconsistent, can adjust according to the impedance matching value of on-site actual situations to each submodule receiving matching module 2;
Because the HDMI signal of each passage exists signal attenuation and distortion when comparatively long range propagation, the each submodule receiving matching module 2 also carries out signal equalization and amplification to each passage HDMI video signal, improve signal amplitude and signal quality, to eliminate by transmitting the image error code caused; The equal adjustable of the balance parameters of each passage, amplifying parameters;
(3) electrically rebuild module 3 and signal reconstruction is carried out to each passage HDMI signal receiving matching module 2 output; Concrete, each submodule electrically rebuilding module 3 is adjudicated according to HDMI electrical standard each passage HDMI signal received and regenerates, and to eliminate the overshoot of input signal, undershoot, burr, exports the HDMI video signal with standard electrical characteristic; Wherein, HDMI electrical standard comprises the minimum and maximum of the minimum and maximum of high level, low level, signal swing rate, shake;
(4) eliminate the clock of each passage of HDMI and the delay of data of electrically rebuilding module 3 output, make to keep between each data-signal, between data-signal with clock signal aliging;
Transmission cable characteristics due to each passage causes the delay variance of each passage all not identical; The clock of each passage, the delay of data are adjusted respectively, makes clock and the alignment of data of each channel interior;
(5) demodulation module 5 is to the HDMI signal after each passage alignment, adopts the clock signal of each passage to sample and demodulation to each parallel data signal, obtains the parallel demodulation data of each passage;
In the present embodiment, each submodule of demodulation module 5 has self-calibration function; After the calibration intervals preset, each submodule carries out self calibration respectively, clock signal is correctly sampled and each data-signal of demodulation, to avoid interference the error or drift that cause; For the passage that interference is more serious, the calibration intervals of the submodule of the module 5 corresponding to it is shorter;
(6) HDMI protocol module 6 is resolved HDMI agreement according to video control signal, produces HDMI group bag data;
(7) HDMI video decoder module 7 is according to HDMI group bag data and decoding parametric, decodes, union operation to each channel parallel demodulating data, recovers the HDMI benchmark image signal of image signal source; Wherein, decoding parametric comprises VESA, JEIDA transmission standard, 6 ~ 10bit image tonescale, synchronizing signal forward and reverse, transmission channel number;
(8) HDMI turns RGB module 8, by above-mentioned, HDMI benchmark image signal is converted to rgb video signal;
(9) the above-mentioned rgb video signal of rgb image data cache module 9 buffer memory, makes each road HDMI exported keep continuously uninterrupted; Meanwhile, RGB image resolution ratio detection module 10 is according to its image level of the synchronous signal obtaining of benchmark image and vertical resolution; Wherein, the synchronizing signal of benchmark image comprises VSYNC (field sync signal), HSYNC (line synchronizing signal) and DE (data enable signal);
(10) in embodiment, each HDMI video output module is all parallel independent, and each HDMI video output module inside has identical submodule, processes identical to the received signal; Be described for HDMI video output module 1 below; Local image sequence generation module 11 obtains the some screen clock signal of the module to be measured on corresponding passage 1 according to the time sequence parameter (row field crop, back porch, synchronous pulsewidth) of the resolution of said reference image and module to be measured; RGB image generating module 13 receives the caching image data of output channel view data cache module 12 output according to this clock signal, according to the Image Coding parameter of the module to be measured of passage 1 correspondence, the point generating the to be measured module corresponding with passage 1 shields RGB picture signal;
Wherein, Image Coding parameter comprises VESA, JEIDA standard, 6bit ~ 10bit color range, RGB order, and synchronizing signal is reverse;
(10) by HDMI video signal conversion module 14, above-mentioned some screen RGB picture signal is carried out segmentation, the restructuring of each channel data, bit rearrangement, produce the HDMI parallel data of each output channel, and under the effect of HDMI encrypting module 15, HDMI parallel data is encrypted;
(11) adjusted each clock of passage exported, the time delay of data-signal by HDMI time delay adjusting module 16, make output signal after transmission cable, the HDMI signal of all passages arrives module side to be measured all simultaneously;
(12) by HDMI signal driver module 17, electrical characteristic is exported to the HDMI of each passage, transmission characteristic arranges, comprise preemphasis, drive intensity, the electric amplitude of HDMI, Slew Rate, output impedance; Make the multichannel HDMI video signal that exports by under the transmission cable of different qualities and interference effect, arrive the reception requirement that the signal quality of module to be measured and signal amplitude all meet HDMI liquid crystal module, guarantee that module can be verified by reliable and stable long screen;
(13) hot plug module is adopted to process the HDMI video signal after the above-mentioned adjustment of step, the HDMI video signal supporting interface hot plug that each passage is exported.
This HDMI video signal single channel that embodiment provides turns multiple-pass unit, and for a road HDMI video signal of input, exportable multichannel HDMI video signal, verifies in being suitable for carrying out module on a large scale; And each road HDMI video signal can export simultaneously, but it is independent of one another, do not interfere with each other, its image time sequence parameter, HDMI video coded system, HDMI transmission channel number, output drive, export transmission characteristic, export HDMI electrical characteristic, export the parameters such as time delay all can adjust separately, be applicable to, to a large amount of, there is equal resolution, to there is the module of different qualities under different operating environment, the checking of same time point screen can be carried out.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a HDMI video signal single channel turns the device of multichannel, it is characterized in that, described device comprises a HDMI video signal input interface, HDMI video control signal input interface, a multiple HDMI video signal output interface, and solidify HDMI video decoder module in a programmable logic device, HDMI protocol module, HDMI turn RGB module, RGB image resolution ratio detection module, rgb image data cache module and multiple HDMI video output module;
Described programmable logic device has the HDMI video signal input terminal coupling described HDMI video signal input interface, the HDMI video control signal input terminal coupling described HDMI video control signal input interface and couples multiple HDMI video signal output terminals of each described HDMI video signal output interface one by one;
Described HDMI protocol module is connected with HDMI video decoder module, HDMI video decoder module and HDMI turn RGB model calling, HDMI turns RGB module and is connected with RGB image resolution ratio detection module and rgb image data cache module, and RGB image resolution ratio detection module is connected with each HDMI video output module with rgb image data cache module; Each HDMI video output module is parallel independent, all can separate configurations HDMI video coding parameter and transformation parameter, according to a road HDMI video signal of input, can generate the multichannel HDMI video signal with different qualities;
Described HDMI video decoder module couples described HDMI video signal input interface by HDMI video signal input terminal, and HDMI protocol module and each HDMI video output module all couple described video control signal input interface by HDMI video control signal input terminal; Each HDMI video output module has multiple passage HDMI video signal output part, and each passage HDMI video signal output part couples HDMI video signal output interface by HDMI video signal output terminal.
2. device as claimed in claim 1, it is characterized in that, described device also comprises human-machine interface module; Described human-machine interface module has outside display interface and external command input interface; This human-computer interaction module is used for generating HDMI video control signal according to external command, is sent to HDMI protocol module and each HDMI video output module by HDMI video control signal input terminal; Also for the state information of whole device is exported by outside display interface.
3. device as claimed in claim 2, it is characterized in that, described device also comprises HDMI video receiver module; Described HDMI video receiver module solidifies in described programmable logic device, its first end couples described HDMI video signal input interface by described HDMI video signal input terminal, second end connects described human-computer interaction module by described HDMI video control signal input terminal, and the 3rd end is connected with described HDMI video decoder module.
4. device as claimed in claim 3, is characterized in that, described HDMI video receiver module comprises reception matching module, electrically rebuilds module, time delay alignment module and demodulation module;
Described reception matching module with electrically rebuild model calling, electrically rebuild module and be connected with time delay alignment module, time delay alignment module is connected with demodulation module; Receive the input of matching module as the first end of HDMI video receiver module, the output of demodulation module is as the 3rd end of HDMI video receiver module; Receive matching module control end, electrically rebuild the control end of module controls end, time delay alignment module control end and demodulation module side by side as the second end of HDMI video receiver module.
5. device as claimed in claim 4, it is characterized in that, described reception matching module comprises multiple reception matched sub-block, and electrically reconstruction module comprises multiple electric reconstruction submodule, time delay alignment module comprises multiple time delay alignment submodule, demodulation module comprises multiple demodulation submodule; Receive matched sub-block, electrically rebuild submodule, time delay alignment submodule is identical with the number of demodulation submodule.
6. device as claimed in claim 5, it is characterized in that, described HDMI video output module comprises local image sequence generation module, output channel view data cache module, RGB image generating module, HDMI encrypting module, HDMI video signal conversion module, HDMI time delay adjusting module and HDMI signal driver module;
Described local image sequence generation module is all connected with RGB image generating module with output channel view data cache module, RGB image generating module is all connected with HDMI video signal conversion module with HDMI encrypting module, HDMI video signal conversion module is connected with HDMI time delay adjusting module, and HDMI time delay adjusting module is connected with HDMI signal driver module; The input of local image sequence generation module is as the second end of HDMI video output module; The input of output channel view data cache module is as the 3rd end of HDMI video output module; The output of HDMI signal driver module is as the HDMI video signal output part of HDMI video output module.
7. the HDMI video signal single channel turning the device of multichannel based on the HDMI video signal single channel described in any one of claim 1 to 6 turns a method for multichannel, and it is characterized in that, described method comprises the steps:
(1) HDMI agreement is resolved, produce HDMI group bag data;
(2) according to decoding relevant parameter and described HDMI group bag data, HDMI parallel demodulation bus data to be decoded, union operation, recover the HDMI benchmark image signal of image signal source;
(3) described HDMI benchmark image signal is converted to rgb video signal;
(4) rgb video signal data described in buffer memory; Meanwhile, horizontal resolution and the vertical resolution of its image is gone out according to the synchronization signal detection of benchmark image;
(5) the some screen clock signal of module to be measured corresponding to each passage is obtained according to the time sequence parameter of the resolution of the institute HDMI benchmark image module to be measured corresponding with output channel; Receive the output channel view data of buffer memory according to this some screen clock signal, and according to the Image Coding parameter of the module to be measured preset, output channel view data is converted to the some screen RGB picture signal that each passage is corresponding;
(6) described screen RGB picture signal is carried out to segmentation, the restructuring of each channel data, bit rearrangement, generates the HDMI parallel data of each output channel; And this HDMI parallel data is encrypted;
(7) adjust the clock of HDMI video signal inside and the time delay of data-signal of each output channel, make the HDMI video signal of all passages all can arrive HDMI liquid crystal module to be measured after stube cable simultaneously.
8. HDMI video signal single channel as claimed in claim 7 turns the method for multichannel, it is characterized in that, also comprises the steps (8) after described step (7):
(8) output electrical characteristic and transmission characteristic adjustment are carried out to the HDMI video signal of each passage after time delay adjustment, make the quality of the HDMI video signal of each passage arriving module to be measured and signal amplitude all can reach module and receive requirement.
9. HDMI video signal single channel as claimed in claim 7 turns the method for multichannel, it is characterized in that, also comprises the steps (9) after described step (8):
(9) hot plug module is adopted to process the HDMI video signal after step (8) adjustment, the HDMI video signal supporting interface hot plug that each passage is exported.
10. HDMI video signal single channel as claimed in claim 7 turns the method for multichannel, and it is characterized in that, described HDMI video signal single channel turns the method for multichannel, and the single channel HDMI video signal of its input is from image signal source; Before step (2), also comprise the HDMI video signal that image signal source is sent and adjust and the step of demodulation, specific as follows:
A () receives the HDMI channel video signals that image signal source sends, be terminated, impedance matching and signal equalization and amplification to the input signal of each passage;
B () is according to HDMI electrical standard, signal decision and reconstruction are carried out to each passage HDMI signal after step (a) adjustment, eliminate input signal overshoot, undershoot and burr, export the HDMI video signal with standard electrical characteristic, to avoid interference the erroneous judgement causing subsequent module;
C () processes the above-mentioned delay had between the clock of each channel interior of HDMI video signal of standard electrical characteristic and data-signal, make to keep between each data-signal, between data-signal with clock signal aliging;
D () adopts the clock signal of each passage to sample and demodulation to data-signal parallel in respective channel, obtain the HDMI parallel demodulation bus data of each passage.
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| CN107357750A (en) * | 2017-06-06 | 2017-11-17 | 北京小鸟看看科技有限公司 | The processing method and processing device of the connection status result of hot-plug interface |
| CN108184039A (en) * | 2017-12-26 | 2018-06-19 | 龙迅半导体（合肥）股份有限公司 | A kind of interface conversion method and system |
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| CN103050073B (en) * | 2012-12-26 | 2015-08-12 | 武汉精测电子技术股份有限公司 | DP decoding and the self-adjusting liquid crystal module method of testing of resolution and device |
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| CN107357750A (en) * | 2017-06-06 | 2017-11-17 | 北京小鸟看看科技有限公司 | The processing method and processing device of the connection status result of hot-plug interface |
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| WO2022012050A1 (en) * | 2020-07-15 | 2022-01-20 | 海信视像科技股份有限公司 | Digital video signal generation circuit, digital video signal generation system, digital video signal generation method, and non-volatile storage medium |
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