CN111901583A - HDMI signal detection method and device and HDMI signal attenuator - Google Patents
HDMI signal detection method and device and HDMI signal attenuator Download PDFInfo
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- 230000008878 coupling Effects 0.000 claims description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
Abstract
The invention discloses an HDMI signal detection method, an HDMI signal detection device and an HDMI signal attenuator, which are characterized by firstly receiving an HDMI signal test instruction and an HDMI detection signal; analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable; then according to the testing length of the HDMI cable, performing signal attenuation on the HDMI detection signal through an HDMI signal attenuator; and finally, comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a method and an apparatus for detecting a High Definition Multimedia Interface (HDMI) signal, and an HDMI signal attenuator.
Background
The HDMI signal is attenuated to some extent as the transmission distance increases. Therefore, in factory inspection, the attenuation characteristics of the HDMI connection line are usually tested. However, since the test equipment, the test cable and the test environment are stable, some defective devices near the fault boundary may not be discovered. Therefore, the user terminal may have an audio/video playing fault of the HDMI device due to different receiving devices, uneven quality of the HDMI cable, poor use environment, and the like.
Disclosure of Invention
The embodiment of the invention provides an HDMI signal detection method, an HDMI signal detection device and an HDMI signal attenuator, aiming at overcoming the defect of the prior art in testing the attenuation characteristic of an HDMI connecting line.
According to a first aspect of the present invention, there is provided an HDMI signal detection method, comprising: receiving an HDMI signal test instruction and an HDMI detection signal; analyzing the HDMI signal detection instruction to obtain the testing length of the HDMI cable; according to the testing length of the HDMI cable, performing signal attenuation on the HDMI detection signal through an HDMI signal attenuator; and comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result.
According to an embodiment of the present invention, the signal attenuation of the HDMI detection signal by the HDMI signal attenuator according to the test length of the HDMI cable includes: generating an HDMI signal attenuation test instruction carrying the test length of the HDMI cable; the HDMI signal attenuator is connected with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable through the HDMI signal attenuation testing instruction; and performing signal attenuation on the HDMI detection signal through the switched-on HDMI cable equivalent circuit.
According to an embodiment of the present invention, the method further comprises: judging whether the comparison result meets an error allowable range or not; and if the comparison result does not meet the error allowable range, reporting the comparison result.
According to the second aspect of the present invention, there is also provided an HDMI signal detecting apparatus comprising: the receiving module is used for receiving the HDMI signal test instruction and the HDMI detection signal; the analysis module is used for analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable; the signal attenuation module is used for carrying out signal attenuation on the HDMI detection signal through the HDMI signal attenuator according to the test length of the HDMI cable; and the comparison module is used for comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result.
According to an embodiment of the present invention, the signal attenuation module is specifically configured to generate an HDMI signal attenuation test instruction carrying a test length of the HDMI cable; the HDMI signal attenuator is connected with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable through the HDMI signal attenuation testing instruction; and performing signal attenuation on the HDMI detection signal through the switched-on HDMI cable equivalent circuit.
According to an embodiment of the invention, the apparatus further comprises: the judging module is used for judging whether the comparison result meets an error allowable range; and the reporting module is used for reporting the comparison result if the comparison result does not meet the error allowable range.
According to a third aspect of the present invention, there is also provided an HDMI signal attenuator comprising: the microcontroller is used for receiving an HDMI signal attenuation test instruction, wherein the HDMI signal attenuation test instruction carries the test length of an HDMI cable; the HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable is triggered and connected; the HDMI cable equivalent circuit is used for carrying out signal attenuation on the input HDMI detection signal and outputting the attenuated HDMI signal.
According to an embodiment of the present invention, the HDMI cable equivalent circuit includes a minute checking pair circuit for simulating the length of the HDMI cable, a pin microstrip line equivalent circuit, and a pin error compensation circuit connected between the two.
According to an embodiment of the present invention, the pin microstrip line equivalent circuit includes a plurality of sections of capacitive-inductive coupling circuits, where the number of sections is related to the test length of the HDMI cable.
According to an embodiment of the present invention, the attenuator further comprises a switching circuit; the microcontroller is specifically configured to control the switch circuit to switch on the HDMI cable equivalent circuit corresponding to the test length of the HDMI cable.
The embodiment of the invention provides an HDMI signal detection method, an HDMI signal detection device and an HDMI signal attenuator, which are characterized in that firstly, an HDMI signal test instruction and an HDMI detection signal are received; analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable; then according to the testing length of the HDMI cable, performing signal attenuation on the HDMI detection signal through an HDMI signal attenuator; and finally, comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result. Therefore, the HDMI signal attenuator is matched with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable to test the attenuation characteristic of the HDMI connecting line, and the method for automatically detecting the HDMI signal attenuation is realized.
It is to be understood that the teachings of the present invention need not achieve all of the above-described benefits, but rather that specific embodiments may achieve specific technical results, and that other embodiments of the present invention may achieve benefits not mentioned above.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Fig. 1 is a schematic diagram illustrating a configuration of an HDMI signal detection system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an implementation flow of an HDMI signal detection method according to an embodiment of the present invention;
fig. 3 shows a schematic configuration of the HDMI signal detection apparatus according to the embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the structure of an HDMI signal attenuator according to an embodiment of the present invention;
FIG. 5 shows a hardware schematic block diagram of an HDMI signal attenuator according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an equivalent circuit model of an HDMI cable according to an embodiment of the present invention;
FIG. 7 is a table showing values of parameters in an HDMI cable equivalent circuit model according to an embodiment of the present invention;
fig. 8 is a schematic diagram showing a structure of an equivalent circuit of a pin microstrip line according to an embodiment of the present invention.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given only to enable those skilled in the art to better understand and to implement the present invention, and do not limit the scope of the present invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Fig. 1 is a schematic diagram illustrating a configuration of an HDMI signal detection system according to an embodiment of the present invention; fig. 2 is a schematic flow chart illustrating an implementation of the HDMI signal detection method according to the embodiment of the present invention.
Referring to fig. 1, the HDMI signal detection system according to the embodiment of the present invention includes a test terminal and a main board to be tested that are connected via a USB serial port, and when the main board to be tested receives an HDMI signal test instruction sent by the test terminal, an HDMI interface of the test main board outputs an HDMI signal to an HDMI signal attenuator, where the HDMI signal attenuator is composed of a set of equivalent circuits that can be switched by a switch circuit to match HDMI cables with different lengths; and the HDMI signals passing through the HDMI attenuator are input to automatic detection equipment for processing, analysis and comparison, and finally a test result is obtained.
Based on the HDMI signal detection system shown in fig. 1, an embodiment of the present invention provides an HDMI signal detection method, as shown in fig. 2, the method includes: operation 201, receiving an HDMI signal test instruction and an HDMI detection signal; operation 202, analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable; operation 203, performing signal attenuation on the HDMI detection signal through the HDMI signal attenuator according to the test length of the HDMI cable; in operation 204, the attenuated HDMI signal is compared with the HDMI detection signal to obtain a comparison result.
In operations 201 to 202, referring to fig. 1, after the to-be-tested motherboard receives an HDMI signal test instruction sent by the test terminal, the test length of the HDMI cable is obtained through analysis.
In operation 203, after the test length of the HDMI cable is obtained through analysis, the test main board first generates an HDMI signal attenuation test instruction carrying the test length of the HDMI cable, and transmits the HDMI signal attenuation test instruction to the HDMI signal attenuator through the HDMI interface; then, an HDMI signal attenuator is used for switching on an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable through an HDMI signal attenuation testing instruction; and finally, carrying out signal attenuation on the HDMI detection signal through the connected HDMI cable equivalent circuit.
Here, utilizing an HDMI signal attenuator to turn on an HDMI cable equivalent circuit corresponding to a test length of the HDMI cable through an HDMI signal attenuation test instruction specifically includes: after a Microcontroller (MCU) in the HDMI signal attenuator receives an HDMI signal attenuation test instruction, a trigger switch circuit is used for switching on an HDMI cable equivalent circuit corresponding to the test length of the HDMI cable.
In operation 204, referring to fig. 1, the attenuated HDMI signal is compared with the HDMI detection signal by the test equipment to obtain a comparison result, so as to implement the method for automatically detecting the attenuation of the HDMI signal.
In one implementation, the embodiment of the present invention further includes: judging whether the comparison result meets an error allowable range or not; and if the comparison result does not meet the error allowable range, reporting the comparison result. Therefore, the equipment to be tested can be continuously optimized according to the comparison result so as to output a better HDMI signal.
The HDMI signal detection method comprises the steps of firstly receiving an HDMI signal test instruction and an HDMI detection signal; analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable; then according to the testing length of the HDMI cable, performing signal attenuation on the HDMI detection signal through an HDMI signal attenuator; and finally, comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result. Therefore, the HDMI signal attenuator is matched with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable to test the attenuation characteristic of the HDMI connecting line, and the method for automatically detecting the HDMI signal attenuation is realized.
Based on the HDMI signal detection method described above, an embodiment of the present invention further provides an HDMI signal detection apparatus, as shown in fig. 3, where the apparatus 30 includes: the receiving module 301 is configured to receive an HDMI signal test instruction and an HDMI detection signal; the analysis module 302 is configured to analyze the HDMI signal test instruction to obtain a test length of the HDMI cable; the signal attenuation module 303 is configured to perform signal attenuation on the HDMI detection signal through an HDMI signal attenuator according to the test length of the HDMI cable; the comparison module 304 is configured to compare the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result.
According to an embodiment of the present invention, the signal attenuation module 303 is specifically configured to generate an HDMI signal attenuation test instruction carrying a test length of the HDMI cable; the HDMI signal attenuator is connected with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable through the HDMI signal attenuation testing instruction; and performing signal attenuation on the HDMI detection signal through the switched-on HDMI cable equivalent circuit.
According to an embodiment of the present invention, the apparatus 30 further comprises: the judging module is used for judging whether the comparison result meets an error allowable range; and the reporting module is used for reporting the comparison result if the comparison result does not meet the error allowable range.
Here, it should be noted that: the above description of the embodiment of the HDMI signal detecting apparatus is similar to the description of the embodiment of the method shown in fig. 2, and has similar beneficial effects to the embodiment of the method shown in fig. 2, and therefore, the description thereof is omitted. For technical details not disclosed in the embodiment of the HDMI signal detecting apparatus of the present invention, please refer to the description of the method embodiment shown in fig. 2 of the present invention for brevity, and therefore, will not be described again.
Based on the HDMI signal detection apparatus, the function of the signal attenuation module 303 is implemented by an HDMI signal attenuator. An embodiment of the present invention further provides an HDMI signal attenuator, as shown in fig. 4, where the attenuator 40 includes: the microcontroller 401 is configured to receive an HDMI signal attenuation test instruction, where the HDMI signal attenuation test instruction carries a test length of an HDMI cable; the HDMI cable equivalent circuit 402 is also used for triggering and switching on the HDMI cable equivalent circuit corresponding to the test length of the HDMI cable; the HDMI cable equivalent circuit 402 is configured to perform signal attenuation on the input HDMI detection signal, and output the attenuated HDMI signal.
FIG. 5 shows a hardware schematic block diagram of an HDMI signal attenuator according to an embodiment of the present invention; FIG. 6 is a schematic diagram of an equivalent circuit model of an HDMI cable according to an embodiment of the present invention; FIG. 7 is a table showing values of parameters in an HDMI cable equivalent circuit model according to an embodiment of the present invention; fig. 8 is a schematic diagram showing a structure of an equivalent circuit of a pin microstrip line according to an embodiment of the present invention. The HDMI signal attenuator will be described in detail with reference to fig. 5 to 8.
Referring to fig. 5, after receiving the HDMI signal attenuation test command, a Microcontroller (MCU) in the HDMI signal attenuator triggers a switch circuit to turn on an HDMI cable equivalent circuit corresponding to the test length of the HDMI cable. In the diagram of fig. 5, 1 meter, 5 meters and 10 meters of HDMI cable equivalent circuits are equivalent.
According to an embodiment of the present invention, as shown in fig. 6, the HDMI cable equivalent circuit includes a pair circuit for checking and differentiating the length of the HDMI cable, a pin microstrip line equivalent circuit, and a pin error compensation circuit connected therebetween.
It should be added that, the invention uses HFSS to perform modeling simulation based on the material property and transmission characteristic of the HDMI cable, then derives the HFSS simulation result as a scattering matrix file (including SPICE model and model parameters) in s4P format, and then introduces the file into ADS software, and designs and establishes an equivalent circuit model of the HDMI interface in ADS. Through the collaborative simulation modeling of HFSS and ADS, a circuit model is finally established to enable the circuit model to be approximately equivalent to the HDMI transmission line with the interface. By comparing the degree of coincidence between the differential mode loss curve of the equivalent circuit model and the actual measurement curve, the model is tuned and optimized in the ADS, and further the values of each element in the model are determined, as shown in fig. 7.
According to an embodiment of the present invention, the pin microstrip line equivalent circuit includes a plurality of sections of capacitive-inductive coupling circuits, wherein the number of the sections is related to the test length of the HDMI cable. For example, as shown in fig. 8, for the HDMI cable equivalent circuit model shown in fig. 6 corresponding to the parameter values of the elements shown in fig. 7, the pin-microstrip line equivalent circuit includes 7 pieces of capacitive-inductive coupling circuits.
Therefore, the HDMI cable equivalent circuits with different lengths, which are matched by the HDMI signal attenuator, can test the signal transmission reliability at different distances; the transmission distance testing precision is determined by the minimum unit of the equivalent circuit of the attenuator, and can be accurate to 1 meter.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An HDMI signal detection method, the method comprising:
receiving an HDMI signal test instruction and an HDMI detection signal;
analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable;
according to the testing length of the HDMI cable, performing signal attenuation on the HDMI detection signal through an HDMI signal attenuator;
and comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result.
2. The method of claim 1, wherein signal attenuating the HDMI detected signal by an HDMI signal attenuator based on the test length of the HDMI cable comprises:
generating an HDMI signal attenuation test instruction carrying the test length of the HDMI cable;
the HDMI signal attenuator is connected with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable through the HDMI signal attenuation testing instruction;
and performing signal attenuation on the HDMI detection signal through the switched-on HDMI cable equivalent circuit.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
judging whether the comparison result meets an error allowable range or not;
and if the comparison result does not meet the error allowable range, reporting the comparison result.
4. An HDMI signal detection apparatus, comprising:
the receiving module is used for receiving the HDMI signal test instruction and the HDMI detection signal;
the analysis module is used for analyzing the HDMI signal test instruction to obtain the test length of the HDMI cable;
the signal attenuation module is used for carrying out signal attenuation on the HDMI detection signal through the HDMI signal attenuator according to the test length of the HDMI cable;
and the comparison module is used for comparing the attenuated HDMI signal with the HDMI detection signal to obtain a comparison result.
5. The apparatus of claim 4,
the signal attenuation module is specifically used for generating an HDMI signal attenuation test instruction carrying the test length of the HDMI cable; the HDMI signal attenuator is connected with an HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable through the HDMI signal attenuation testing instruction; and performing signal attenuation on the HDMI detection signal through the switched-on HDMI cable equivalent circuit.
6. The apparatus of claim 4 or 5, further comprising:
the judging module is used for judging whether the comparison result meets an error allowable range;
and the reporting module is used for reporting the comparison result if the comparison result does not meet the error allowable range.
7. An HDMI signal attenuator, the attenuator comprising:
the microcontroller is used for receiving an HDMI signal attenuation test instruction, wherein the HDMI signal attenuation test instruction carries the test length of an HDMI cable; the HDMI cable equivalent circuit corresponding to the testing length of the HDMI cable is triggered and connected;
the HDMI cable equivalent circuit is used for carrying out signal attenuation on the input HDMI detection signal and outputting the attenuated HDMI signal.
8. The attenuator of claim 7, wherein the HDMI cable equivalent circuit comprises a differential pair circuit for simulating HDMI cable length, a pin-microstrip equivalent circuit, and a pin error compensation circuit connected therebetween.
9. The attenuator of claim 8, wherein the pin-microstrip equivalent circuit comprises a plurality of sections of capacitive-inductive coupling circuit, wherein the number of sections is related to the testing length of the HDMI cable.
10. The attenuator of any one of claims 7 to 9, further comprising a switching circuit;
the microcontroller is specifically configured to control the switch circuit to switch on the HDMI cable equivalent circuit corresponding to the test length of the HDMI cable.
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| CN202010440270.XA CN111901583A (en) | 2020-05-22 | 2020-05-22 | HDMI signal detection method and device and HDMI signal attenuator |
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