CN109379585B - HDMI compatibility testing device and method - Google Patents
HDMI compatibility testing device and method Download PDFInfo
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Abstract
The invention discloses a device and a method for testing HDMI (high definition multimedia interface) compatibility, wherein the HDIM compatibility testing device comprises: the EDID collecting server is used for obtaining EDID data of the HDMI display equipment and classifying the EDID data according to EDID standards to obtain EDID data of each category; selecting one of the EDID data of each category as a test sample of each category; combining the test samples into a test sample set, simulating the user display equipment through the analyzed data by using a display device simulator, sending a preset instruction, such as a resolution adjustment instruction, to the simulated user display equipment, and obtaining the compatibility of the test user display equipment to the set top box HDIM by verifying whether the instruction is correctly executed. The invention solves the problems of the prior art that the HDIM compatibility test coverage is not wide enough and the test efficiency is low; the technical effects of large number of test samples, wide coverage and higher test efficiency are achieved.
Description
Technical Field
The invention relates to the technical field of HDMI compatibility test, in particular to an HDMI compatibility device and method.
Background
At present, each manufacturer has certain differences in HDMI (High Definition Multimedia Interface) communication protocols or implementation schemes, and different display device brands or different models and batches of the same brand may have differences; therefore, almost all products with the HDMI need to be subjected to HDMI compatibility testing, in the prior art, a large amount of labor is needed for the HDMI compatibility testing, the testing efficiency is extremely low, the number of HDMI display devices is extremely large, and the prior art cannot guarantee the number of samples and the coverage of the testing.
Disclosure of Invention
The invention mainly aims to provide an HDMI compatibility testing device and method, and aims to solve the problems that in the prior art, the number of HDMI compatibility testing samples is small, the testing coverage is narrow, and the testing efficiency is low.
In order to achieve the above object, the present invention provides an HDMI compatibility testing apparatus, comprising: EDID (Extended Display Identification Data) collection server and Display device simulator; wherein the content of the first and second substances,
the EDID collecting server is used for obtaining EDID data of the HDMI display equipment and classifying the EDID data according to EDID standards to obtain EDID data of each category; selecting one of the EDID data of each category as a test sample of each category; combining the test samples into a test sample set;
the display equipment simulator is used for traversing the test sample set, acquiring a traversed target test sample, establishing simulated display equipment according to the target test sample, responding to a preset instruction sent by the product to be tested, and sending the preset instruction to the simulated display equipment; reading the equipment state of the analog display equipment, calculating the execution degree of the analog display equipment on the preset instruction according to the equipment state, and obtaining the HDMI compatibility of the target display equipment on a product to be tested according to the execution degree.
Preferably, the HDMI compatibility testing apparatus further includes: a controllable switch;
the controllable switch is used for controlling the connection and disconnection between the display equipment simulator and a power supply;
or the like, or, alternatively,
the controllable switch is used for controlling the connection and disconnection of the HDMI connecting line between the product to be tested and the display equipment simulator.
Preferably, the HDMI compatibility testing apparatus includes: a set-top box;
the set top box is used for collecting EDID data of the target HDMI display equipment, storing the EDID data in a local memory and sending the stored EDID data to the EDID collection server;
or the like, or, alternatively,
the set top box is used for collecting EDID data of the target HDMI display equipment, storing the EDID data in a local memory, responding to an EDID data inquiry instruction sent by the EDID collection server, and sending the stored EDID data to the EDID collection server.
Preferably, the EDID collection server is further configured to receive the EDID data sent by the set top box, and update the test sample set after receiving the EDID data of the new category.
Preferably, the display device simulator is further configured to locally store a test sample set, and update the test sample set according to a preset rule.
The invention also provides an HDMI compatibility test method, which comprises the following steps:
the EDID collecting server acquires EDID data of the HDMI display equipment, classifies the EDID data according to EDID standards, and acquires EDID data of various categories;
selecting one of the EDID data from each category as a test sample of each category by the EDID collection server; combining the test samples into a test sample set;
traversing the test sample set by the display equipment simulator to obtain a traversed target test sample, and establishing simulated display equipment according to the target test sample;
the display equipment simulator responds to a preset instruction sent by the product to be tested and sends the preset instruction to the simulation display equipment;
and the display equipment simulator reads the equipment state of the simulation display equipment, calculates the execution degree of the simulation display equipment to the preset instruction according to the equipment state, and obtains the HDMI compatibility of the target display equipment to the product to be tested according to the execution degree.
Preferably, after the display device simulator traverses the test sample set to obtain a traversed target test sample, and establishes a simulated display device according to the target test sample, the HDMI compatibility testing method further includes:
the controllable switch controls the display equipment simulator to be disconnected with the power supply and then connected;
or the like, or, alternatively,
the controllable switch controls the HDMI connecting line between the product to be tested and the display equipment simulator to be disconnected and then connected.
Preferably, before the EDID data of the HDMI display device is acquired by the EDID collection server and is classified according to the EDID standard, and the EDID data of each category is acquired, the HDMI compatibility test method further includes:
the set top box collects EDID data of the target HDMI display equipment, stores the EDID data in a local memory, and sends the stored EDID data to the EDID collection server;
or the like, or, alternatively,
and the set top box collects the EDID data of the target HDMI display equipment, stores the EDID data in a local memory, and sends the stored EDID data to the EDID collection server.
Preferably, the EDID collection server selects one of the EDID data of each category as a test sample of each category; after combining the plurality of test samples to obtain a test sample set, the HDMI compatibility testing method further includes:
and the EDID collection server receives the EDID data sent by the set top box and updates the test sample set after receiving the EDID data of the new type.
Preferably, the display device simulator traverses the test sample set to obtain a traversed target test sample, and before the simulated display device is built according to the target test sample, the HDMI compatibility testing method further includes:
the display equipment simulator locally stores the test sample set and updates the test sample set according to a preset rule.
According to the technical scheme, the HDMI compatibility testing device and method are obtained by arranging the EDID collecting server and the display equipment simulator, the EDID collecting server obtains EDID data of target display equipment, the obtained EDID data are processed to obtain test samples, the test samples are combined into a test sample set, and the test sample set is sent to the display equipment simulator; the display equipment simulator traverses the test sample set and simulates the display equipment through the test sample to obtain simulated display equipment, and then the compatibility between the product to be tested and the target display equipment is obtained through testing the compatibility between the product to be tested and the simulated display equipment; the technical scheme of the invention solves the problems of small number of HDMI compatibility test samples, narrow test coverage and low test efficiency in the prior art, and achieves the technical effects of large number of HDMI compatibility test samples, wide coverage and higher test efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an HDMI compatibility testing apparatus according to the present invention;
FIG. 2 is a schematic flow chart illustrating an HDMI compatibility testing apparatus according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating an HDMI compatibility testing apparatus according to another embodiment of the present invention;
the reference numbers illustrate:
| reference numerals | Name (R) |
| 100 | |
| 200 | Display device simulator |
The objects, functional features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an HDMI compatibility testing device.
Referring to fig. 1, in an embodiment of the present invention, the HDMI compatibility testing apparatus includes an EDID collection server 100 and a display device simulator 200; the EDID collection server 100 is configured to obtain EDID data of the HDMI display device, classify the EDID data according to an EDID standard, and obtain EDID data of each category; selecting one of the EDID data of each category as a test sample of each category; combining the test samples into a test sample set;
the display device simulator 200 is configured to traverse the test sample set, obtain a traversed target test sample, establish a simulation display device according to the target test sample, and send a preset instruction to the simulation display device in response to the preset instruction sent by the product to be tested; reading the equipment state of the analog display equipment, calculating the execution degree of the analog display equipment on the preset instruction according to the equipment state, and obtaining the HDMI compatibility of the target display equipment on a product to be tested according to the execution degree.
It should be noted that, in this embodiment, the EDID collection server 100 classifies the obtained EDID data, classifies the EDID data of different standards into different categories, selects one EDID data in each category as a test sample of the category, and combines all the test samples into a test sample set.
It is easy to understand that each test sample represents the EDID data type of the test sample, and if the test result is that the compatibility of the test sample is good, the HDMI compatibility of the test sample and the product to be tested is considered to be good.
It is worth emphasizing that the display device emulator 200 may generate a display device emulator from the information in the test sample, whose HDMI compatibility test result is considered equivalent to HDMI compatibility of the display device of this type of EDID data.
The device is easy to understand, by collecting EDID data of the HDMI display equipment and classifying the EDID data, the HDMI compatibility of the display equipment can be obtained only by testing the same type of display equipment once; meanwhile, the device simulates various types of display equipment through the display equipment simulator, so that the HDMI compatibility test only needs EDID data of different types of HDMI display equipment, the test samples of the HDMI compatibility test are greatly increased, the coverage and the sample number of the test are improved, the test process is an automatic process, and the test efficiency of the HDMI compatibility test is greatly improved.
Specifically, the HDMI compatibility testing apparatus further includes: a controllable switch;
the controllable switch is used for controlling the connection and disconnection between the display equipment simulator 200 and a power supply;
this process can also be carried out by:
the controllable switch is used for controlling the connection and disconnection of the HDMI connecting line between the product to be tested and the display equipment simulator 200.
As can be easily understood, the controllable switch is used for controlling the connection and disconnection between the display device simulator and a power supply; the process is used for simulating the communication process between the display equipment and a product to be tested when the display equipment is started for the first time; the controllable switch is used for controlling the connection and disconnection of an HDMI connecting line between the product to be tested and the display equipment simulator; the process is used for simulating the communication process between the display equipment and the product to be tested when the display equipment is connected with the product to be tested for the first time; the two modes are more consistent with the actual equipment working mode, and the test result is more reliable.
Specifically, the HDMI compatibility testing apparatus includes: a set-top box;
the set top box is used for collecting EDID data of the target HDMI display equipment, storing the EDID data in a local memory and sending the stored EDID data to the EDID collection server;
this process can also be carried out by:
the set top box is configured to collect the EDID data of the target HDMI display device, store the EDID data in the local memory, and send the stored EDID data to the EDID collection server 100 in response to the EDID data query instruction sent by the EDID collection server.
It is easy to understand that the set-top box is a set-top box purchased by a user, is installed at the home of the user, and is connected with the display device used by the user, and the working process of the set-top box is to acquire EDID data of the display device when the display device or the set-top box is started up and store the EDID data in the local memory; or when the display device is connected with the set-top box for the first time, the EDID data of the display device is obtained and stored in the local memory.
It should be emphasized that the data stored in the local storage is finally transmitted to the EDID collecting server 100, the set-top box may actively transmit the EDID data to the EDID collecting server when the EDID collecting server 100 does not initiate the query, or may transmit the EDID data to the EDID collecting server 100 in response to the query instruction after the EDID collecting server 100 initiates the query.
It should be noted that, in order to avoid excessive data, a certain acquisition rule may be set, and only the set-top box satisfying the preset condition may upload the EDID data.
Specifically, the EDID collection server 100 is further configured to receive the EDID data sent by the set top box, and update the test sample set after receiving the EDID data of the new category.
It should be emphasized that the EDID collection server 100 updates the test sample set only after receiving the EDID data of the new category, and the compatibility test needs to be performed again, in this embodiment, only one EDID data of the same category is selected for the test, and the HDMI compatibility test results of the other EDID data of the category are determined to be the same as the test results of the EDID data.
Specifically, the display device simulator is further configured to locally store a test sample set, and update the test sample set according to a preset rule.
It should be noted that the display device simulator 200 stores a test sample set sent by the EDID collection server 100, and when performing the HDMI compatibility test, the locally stored test sample set may be directly traversed, or the test sample set stored in the EDID collection server 100 may be directly read.
In this embodiment, an HDMI compatibility testing apparatus is obtained by providing the EDID collection server 100 and the display device simulator 200, where the EDID collection server 100 obtains EDID data of a target display device, processes the obtained EDID data to obtain a test sample, combines the test sample into a test sample set, and sends the test sample set to the display device simulator 200; the display device simulator 200 traverses the test sample set and simulates the display device through the test sample to obtain a simulated display device, and then obtains the compatibility between the product to be tested and the target display device through testing the compatibility between the product to be tested and the simulated display device; the technical scheme of the invention solves the problems of small number of HDMI compatibility test samples, narrow test coverage and low test efficiency in the prior art, and achieves the technical effects of large number of HDMI compatibility test samples, wide coverage and higher test efficiency.
Referring to fig. 2, fig. 2 is a flowchart illustrating a HDMI compatibility testing apparatus according to a second embodiment of the present invention.
The invention also provides an HDMI compatibility test method, which comprises the following steps:
s10, the EDID collecting server 100 obtains EDID data of the HDMI display device, and classifies the EDID data according to EDID standards to obtain EDID data of various categories;
it can be understood that, in this step, the EDID data of each display device is obtained first, and the obtained EDID data of the HDMI display device is classified; the classification standard is the EDID standard, i.e., display devices conforming to the same EDID standard are classified into one group, and this step classifies EDID data representing the respective display devices rather than the actual display devices.
S20, the EDID collecting server 100 selects one of the EDID data of each category as a test sample of each category; combining the test samples into a test sample set;
it should be noted that, in this embodiment, it is determined that the compatibility test results of the similar EDID data are the same, so that only one test sample is selected from the similar EDID data, this step can effectively reduce the number of testing times of the HDMI compatibility test, significantly improve the testing efficiency of the HDMI compatibility test, and does not reduce the sample coverage of the HDMI compatibility test.
S30, traversing the test sample set by the display device simulator 200 to obtain a traversed target test sample, and establishing a simulation display device according to the target test sample;
it is easily understood that the display device simulator 200 reads the test samples in the test sample set from the head and performs the test, and after the test of the first test sample is completed, reads the second test sample and performs the test until all the test samples in the test sample set are completed.
It should be emphasized that, in the testing process, if the HDMI compatibility test result of a certain test sample does not meet the requirement, that is, the display device of this type is incompatible with the product to be tested, the serial number of the test sample is recorded and the EDID data of the test sample is derived, so as to provide analysis for research and development personnel.
S40, the display device simulator 200 responds to a preset instruction sent by the product to be tested, and sends the preset instruction to the simulation display device;
it is easy to understand that, in order to verify the compatibility between the product to be tested and the display device, the preset instruction may include resolution adjustment and system adjustment, for example: the product to be tested sends the instruction for adjusting the resolution to 720P to the display device simulator 200, and after receiving the instruction, the display device simulator 200 records the instruction and sends the instruction to the simulation display device.
And S50, reading the equipment state of the analog display equipment by the display equipment simulator, calculating the execution degree of the analog display equipment on the preset instruction according to the equipment state, and obtaining the HDMI compatibility of the target display equipment on the product to be tested according to the execution degree.
It should be noted that the process of reading the device status of the analog display device and calculating the execution degree of the analog display device on the preset instruction according to the device status includes, but is not limited to, monitoring whether the analog display device can normally output or analyzing whether EDID communication between the product to be tested and the set of test samples is normal.
In the second embodiment, referring to fig. 3, after the step of S30, the HDMI compatibility test method further includes:
s31, the controllable switch controls the display device simulator to be disconnected with the power supply and then connected;
this step can also be accomplished in the following manner:
the controllable switch controls the HDMI connecting line between the product to be tested and the display equipment simulator to be disconnected and then connected.
It is easy to understand that the step is used for simulating the communication process between the analog display equipment and the product to be tested when the analog display equipment is started up for the first time or is connected with the product to be tested for the first time; the test process is more consistent with the actual equipment working mode, and the test result is more reliable.
In a second embodiment, referring to fig. 3, before the step S10, the HDMI compatibility testing method further includes:
s11, the set top box collects EDID data of the target HDMI display device, stores the EDID data in a local memory, and sends the stored EDID data to the EDID collection server;
this step can also be accomplished in the following manner:
and the set top box collects the EDID data of the target HDMI display equipment, stores the EDID data in a local memory, and sends the stored EDID data to the EDID collection server.
It is emphasized that the set-top box is a set-top box purchased by a user, installed in the home of the user and connected with a display device being used by the user; it should be noted that the data stored in the local storage is finally transmitted to the EDID collection server 100, the set-top box may actively transmit the EDID data to the EDID collection server when the EDID collection server 100 does not initiate an inquiry, or may transmit the EDID data to the EDID collection server 100 in response to the inquiry instruction after the EDID collection server 100 initiates an inquiry.
It should be added that, in order to avoid excessive data, a certain acquisition rule may be set, and only the set-top box satisfying the preset condition may upload the EDID data.
After the step of S20, the HDMI compatibility testing method further includes:
and S21, the EDID collecting server receives the EDID data sent by the set top box and updates the test sample set after receiving the EDID data of the new type.
It should be emphasized that the EDID collection server 100 updates the test sample set only after receiving the EDID data of the new category, and the compatibility test needs to be performed again, in this embodiment, only one EDID data of the same category is selected for the test, and the HDMI compatibility test results of the other EDID data of the category are determined to be the same as the test results of the EDID data.
Before the step of S30, the HDMI compatibility testing method further includes:
s32, the display device simulator 200 locally stores the test sample set, and updates the test sample set according to a preset rule.
It is easy to understand that, when the test quantity is relatively large or the communication between the display device simulator 200 and the EDID collection server 100 is relatively troublesome, the test can be normally performed when the test sample set is locally stored in the display device simulator 200, and the test sample set is updated according to the preset rule, so as to update the test sample set and avoid missing the test sample.
It should be noted that the display device simulator 200 stores a test sample set sent by the EDID collection server 100, and when performing the HDMI compatibility test, the locally stored test sample set may be directly traversed, or the test sample set stored in the EDID collection server 100 may be directly read.
In the second embodiment, the EDID data of the target display device is acquired by the EDID collection server 100, the acquired EDID data is processed to obtain a test sample, the test sample is combined into a test sample set, and the test sample set is sent to the display device simulator 200; the display device simulator 200 traverses the test sample set and simulates the display device through the test sample to obtain a simulated display device, and then obtains the compatibility between the product to be tested and the target display device through testing the compatibility between the product to be tested and the simulated display device; the technical scheme of the invention solves the problems of small number of HDMI compatibility test samples, narrow test coverage and low test efficiency in the prior art, and achieves the technical effects of large number of HDMI compatibility test samples, wide coverage and higher test efficiency.
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 system 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 system. 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 system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, etc. are to be interpreted as names.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method of the above embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An HDMI compatibility test apparatus, comprising: an EDID collection server and a display device simulator; wherein the content of the first and second substances,
the EDID collecting server is used for obtaining EDID data of the HDMI display equipment and classifying the EDID data according to EDID standards to obtain EDID data of each category; selecting one of the EDID data of each category as a test sample of each category; combining the test samples into a test sample set;
the display equipment simulator is used for traversing the test sample set, acquiring a traversed target test sample, establishing simulated display equipment according to the target test sample, responding to a preset instruction sent by a product to be tested, and sending the preset instruction to the simulated display equipment; reading the equipment state of the analog display equipment, calculating the execution degree of the analog display equipment on the preset instruction according to the equipment state, and obtaining the HDMI compatibility of the target display equipment on a product to be tested according to the execution degree, wherein the preset instruction comprises at least one of resolution adjustment and system adjustment;
the display equipment simulator is also used for simulating various types of display equipment.
2. The HDMI compatibility test apparatus of claim 1, wherein said HDMI compatibility test apparatus further comprises: a controllable switch;
the controllable switch is used for controlling the connection and disconnection between the display equipment simulator and a power supply;
or the like, or, alternatively,
the controllable switch is used for controlling the connection and disconnection of the HDMI connecting line between the product to be tested and the display equipment simulator.
3. The HDMI compatibility test apparatus of claim 1, wherein said HDMI compatibility test apparatus comprises: a set-top box;
the set top box is used for collecting EDID data of the target HDMI display equipment, storing the EDID data in a local memory and sending the stored EDID data to the EDID collection server;
or the like, or, alternatively,
the set top box is used for collecting EDID data of the target HDMI display equipment, storing the EDID data in a local memory, responding to an EDID data inquiry instruction sent by the EDID collection server, and sending the stored EDID data to the EDID collection server.
4. The HDMI compatibility test apparatus of claim 3, wherein said EDID collection server is further configured to receive EDID data transmitted by said set top box and update said test sample set upon receiving EDID data of a new category.
5. The HDMI compatibility test apparatus of claim 4,
the display device simulator is further used for locally storing a test sample set and updating the test sample set according to a preset rule.
6. An HDMI compatibility test method is characterized in that the HDMI compatibility test method comprises the following steps:
the EDID collecting server acquires EDID data of the HDMI display equipment, classifies the EDID data according to EDID standards, and acquires EDID data of various categories;
selecting one of the EDID data from each category as a test sample of each category by the EDID collection server; combining the test samples into a test sample set;
traversing the test sample set by the display equipment simulator to obtain a traversed target test sample, and establishing simulated display equipment according to the target test sample;
the display equipment simulator responds to a preset instruction sent by a product to be tested and sends the preset instruction to the simulation display equipment;
the display equipment simulator reads the equipment state of the simulation display equipment, calculates the execution degree of the simulation display equipment to the preset instruction according to the equipment state, and obtains the HDMI compatibility of the target display equipment to a product to be tested according to the execution degree, wherein the preset instruction comprises at least one of resolution adjustment and system adjustment;
the display device simulator simulates various categories of display devices.
7. The HDMI compatibility testing method of claim 6, wherein said display device emulator traverses said set of test samples, obtains a target test sample traversed, and after building an emulated display device according to said target test sample, said HDMI compatibility testing method further comprises:
the controllable switch controls the display equipment simulator to be disconnected with the power supply and then connected;
or the like, or, alternatively,
the controllable switch controls the HDMI connecting line between the product to be tested and the display equipment simulator to be disconnected and then connected.
8. The HDMI compatibility testing method of claim 6, wherein before said EDID collection server obtains EDID data of the HDMI display device and classifies the EDID data according to EDID standards to obtain EDID data of each category, said HDMI compatibility testing method further comprises:
the set top box collects EDID data of the target HDMI display equipment, stores the EDID data in a local memory, and sends the stored EDID data to the EDID collection server;
or the like, or, alternatively,
the set top box collects EDID data of the target HDMI display device, stores the EDID data in a local memory, responds to an EDID data query instruction sent by the EDID collection server, and sends the stored EDID data to the EDID collection server.
9. The HDMI compatibility test method according to claim 8, wherein said EDID collecting server selects one of EDID data of each category as a test sample of each category; after combining the plurality of test samples to obtain a test sample set, the HDMI compatibility testing method further includes:
and the EDID collection server receives the EDID data sent by the set top box and updates the test sample set after receiving the EDID data of the new type.
10. The HDMI compatibility testing method of claim 9, wherein said display device emulator traverses said set of test samples, obtains a traversed target test sample, and further comprises, before building an emulated display device from said target test sample:
the display equipment simulator locally stores the test sample set and updates the test sample set according to a preset rule.
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| JP2009093696A (en) * | 2007-10-04 | 2009-04-30 | Funai Electric Co Ltd | Test system for information reproducing system |
| US9124853B2 (en) * | 2010-11-30 | 2015-09-01 | Verizon Patent And Licensing Inc. | HDMI device and interoperability testing systems and methods |
| CN106095362A (en) * | 2016-06-02 | 2016-11-09 | 北京金山安全软件有限公司 | Method and device for setting resolution and electronic equipment |
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