CN214480953U - Multimedia interface extension device and multimedia interface extension equipment - Google Patents
Multimedia interface extension device and multimedia interface extension equipment Download PDFInfo
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- CN214480953U CN214480953U CN202120133020.1U CN202120133020U CN214480953U CN 214480953 U CN214480953 U CN 214480953U CN 202120133020 U CN202120133020 U CN 202120133020U CN 214480953 U CN214480953 U CN 214480953U
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Abstract
The application relates to a multimedia interface extension device and a multimedia interface extension device, wherein the multimedia interface extension device comprises: the multimedia signal extension module comprises at least one shunt unit, each shunt unit comprises a first branch and a second branch, each first branch is provided with a capacitor, two ends of each shunt unit are respectively connected with a first-level multimedia interface and a second-level multimedia interface, each shunt unit is used for dividing signals of the first-level multimedia interface into two paths of multimedia signals and transmitting the two paths of multimedia signals to the second-level multimedia interface, and each first-level multimedia interface comprises an HDMI (high-definition multimedia interface). Through the method and the device, the problem that the HDMI interface has weak expansion capability in the related technology is solved, and the expansion capability of the HDMI interface is improved.
Description
Technical Field
The present application relates to the field of multimedia display technologies, and in particular, to a multimedia interface extension apparatus and a multimedia interface extension device.
Background
HDMI (High Definition Multimedia Interface) is a fully digital video and audio transmission Interface, and can transmit uncompressed audio and video signals. With the development of digitization, more and more image Video equipment adopts HDMI Interface output, and the demands of users are very different, some are HDMI input, some are VGA (Video Graphics Array ) input, some are DVI (Digital Visual Interface) input, some are SDI (Serial Digital Interface) input, and some require multi-screen display. At present, the most common method for solving the problems of interface mismatching and insufficient interface number is to use an HDMI-to-VGA integrated chip or an HDMI-to-multi integrated chip to realize the functions of interface conversion, expansion, signal extension and the like.
The related art provides an HDMI information source demultiplexer, which is characterized in that one-to-two chip and a plurality of one-to-four chips are used, and one path of HDMI signal is expanded into a plurality of paths of HDMI signals. The main defects are that the expansion of the HDMI interface can only be realized, the output of other interfaces such as VGA and the like can not be realized, a special conversion chip is used for the interface expansion, the cost is high, and the expansion is inconvenient.
The related technology also provides a VGA signal extender with audio, which is characterized in that a special HDMI-to-VGA integrated chip is used for completing signal conversion, thereby realizing the functions of interface conversion and signal extension. The main defects of the design are that the function of converting HDMI into VGA can be realized, multi-path HDMI signals cannot be expanded, and the display output is single.
At present, no effective solution is provided for the problem of weak expansion capability of the HDMI interface in the related technology.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a multimedia interface expansion device and multimedia interface expansion equipment, so as to at least solve the problem that the expansion capability of an HDMI interface in the related art is weak.
In a first aspect, an embodiment of the present application provides a multimedia interface extension apparatus, including: the multimedia signal extension module comprises at least one shunt unit, each shunt unit comprises a first branch and a second branch, the first branch is provided with a capacitor, two ends of each shunt unit are respectively connected with a first-level multimedia interface and a second-level multimedia interface, each shunt unit is used for dividing signals of the first-level multimedia interface into two paths of multimedia signals and transmitting the two paths of multimedia signals to the second-level multimedia interface, and the first-level multimedia interface comprises an HDMI (high-definition multimedia interface).
In some of these embodiments, the second level multimedia interface comprises an HDMI interface and/or a VGA interface.
In some embodiments, a termination resistor is disposed between each of the branching units and the second-level multimedia interface.
In some of these embodiments, further comprising: and one end of the multimedia signal extension module is connected with the multimedia signal extension module, the other end of the multimedia signal extension module is connected with the second-level multimedia interface, and the multimedia signal extension module is used for extending the transmission distance of the extended multimedia signal.
In some embodiments, the multimedia signal extension module includes a level conversion chip, and a pull-up resistor is disposed inside the level conversion chip.
In some embodiments, a signal repeater is disposed inside the level shift chip, and the signal repeater is used for enhancing the driving capability of the expanded multimedia signal.
In some of these embodiments, the multimedia signal extension module includes a buffer chip.
In some of these embodiments, further comprising: and one end of the multimedia signal conversion module is connected with the multimedia signal expansion module, the other end of the multimedia signal conversion module is connected with the second-level multimedia interface, and the multimedia signal conversion module comprises a signal conversion chip and is used for converting the expanded multimedia signal and transmitting the multimedia signal to the second-level multimedia interface.
In some of these embodiments, the second level multimedia interface comprises at least one of: VGA interface, DVI interface, SDI interface.
In a second aspect, an embodiment of the present application provides a multimedia interface extension device, including: a first level multimedia interface, a second level multimedia interface, and the multimedia interface extension apparatus according to any one of claims 1 to 9, wherein an input of the multimedia interface extension apparatus is connected to the first level multimedia interface, and an output of the multimedia interface extension apparatus is connected to the second level multimedia interface, and wherein the first level multimedia interface comprises an HDMI interface.
Compared with the related art, the multimedia interface extension device and the multimedia interface extension apparatus provided in the embodiments of the present application, wherein the multimedia interface extension device includes: the multimedia signal extension module comprises at least one shunt unit, each shunt unit comprises a first branch and a second branch, each first branch is provided with a capacitor, two ends of each shunt unit are respectively connected with a first-level multimedia interface and a second-level multimedia interface, each shunt unit is used for dividing signals of the first-level multimedia interface into two paths of multimedia signals and transmitting the two paths of multimedia signals to the second-level multimedia interface, and each first-level multimedia interface comprises an HDMI (high-definition multimedia interface). Through the method and the device, the problem that the HDMI interface has weak expansion capability in the related technology is solved, and the expansion capability of the HDMI interface is improved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a block diagram of a multimedia interface extension apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a multimedia signal extension module according to an embodiment of the present application;
fig. 3 is a schematic diagram of a transmission model of an HDMI circuit according to an embodiment of the present application;
FIG. 4 is a block diagram of a multimedia interface extension device implemented in accordance with the present application;
fig. 5 is a schematic structural diagram of a multimedia interface extension apparatus according to a preferred embodiment of the present application.
Description of reference numerals:
10. a multimedia interface extension device; 101. a multimedia signal expansion module; 102. a first branch; 103. a second branch circuit; 104. a capacitor; 105. terminating the resistor; 106. a multimedia signal extension module; 107. a multimedia signal conversion module; 1011. an HDMI signal expansion module; 1061. an HDMI signal extension module; 1071. an HDMI to VGA module;
20. a first level multimedia interface; 201. a first HDMI interface;
30. a second level multimedia interface; 301. a second HDMI interface; 302. and a VGA interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
The multimedia interface expansion device provided by this embodiment can be used in devices such as set-top boxes, DVD (Digital Video Disc) players, personal computers, televisions, game consoles, integrated expanders, Digital stereos, televisions, and the like. The multimedia interface extension apparatus according to an embodiment of the present application will be described below.
Fig. 1 is a block diagram illustrating a multimedia interface extension apparatus according to an embodiment of the present application, and fig. 2 is a schematic diagram illustrating a multimedia signal extension module according to an embodiment of the present application, and referring to fig. 1 to 2, the apparatus includes: the multimedia signal extension module 101, the multimedia signal extension module 101 includes at least one branching unit, each branching unit includes a first branch 102 and a second branch 103, wherein, the first branch 102 is provided with a capacitor 104, two ends of each branching unit are respectively connected with the first-level multimedia interface 20 and the second-level multimedia interface 30, each branching unit is used for dividing the signal of the first-level multimedia interface 20 into two paths of multimedia signals and transmitting the two paths of multimedia signals to the second-level multimedia interface 30, and the first-level multimedia interface 20 includes an HDMI interface.
Although fig. 2 shows 8 branching units, in some embodiments, there may be more or fewer branching units than shown in fig. 2.
In this embodiment, the capacitor 104 is disposed in the first branch 102 of each branch unit, and the characteristics of dc blocking and ac passing of the capacitor are utilized to divide one HDMI signal into two paths, while ensuring that the branches do not affect each other. Compared with the related art using a dedicated integrated chip, the multimedia interface expansion device of the embodiment greatly reduces the cost, and the multimedia signal expansion module 101 can be additionally provided with a shunt unit according to the requirement, so that the convenience of the HDMI interface expansion is greatly improved. Through the method and the device, the problem that the HDMI interface has weak expansion capability in the related technology is solved, and the expansion capability of the HDMI interface is improved.
Compared with the existing scheme of simply expanding the number of HDMI interfaces and converting the HDMI signals into VGA interfaces one by one, the multimedia interface expanding device of the embodiment can convert the expanded HDMI signals into other multimedia signals while realizing the expansion of the number of HDMI signal paths, and the expanded other multimedia signals can be simultaneously output without mutual influence. For example, in some embodiments, the second-level multimedia interface includes an HDMI interface and/or a VGA interface, and one path of HDMI signal can output multiple paths of HDMI signals, multiple paths of VGA signals or output an HDMI signal and a VGA signal simultaneously after being processed by the multimedia interface expansion device of this embodiment, so that the problem of single expansion function of the HDMI interface in the related art is solved, and the expansion function of the HDMI interface is enriched.
FIG. 3 is an HDMI according to an embodiment of the present applicationA schematic diagram of a transmission model of a circuit is shown in FIG. 3, wherein Transmitter represents a transmitting end, Receiver represents a receiving end, Current Source represents a Current Source, D represents a first switch, D represents a second switch, and Z represents0Represents the resonance impedance, RTRepresenting a variable resistance and AVcc representing an analog power supply. Due to the specification requirement Z0＝RTIn some embodiments, referring to fig. 2, a termination resistor 105 is provided between each of the branching units and the second-stage multimedia interface 30 to provide a resonant impedance Z0And a variable resistor RTProviding a debug function when performing impedance matching.
Referring to fig. 2, the second branch 103 of each shunt unit is provided with a terminating resistor 105. The capacitor 104 includes a plurality of capacitors, and the terminating resistor 105 includes a plurality of resistors. Although fig. 2 shows a certain number of capacitors 104 and termination resistors 105, in some embodiments, the number of capacitors 104 and termination resistors 105 may be more or less than that shown in fig. 2.
The HDMI signal expansion is realized through the capacitor 104, the part utilizes the characteristics of isolating direct current and communicating alternating current of the capacitor to divide one path of HDMI signal into two paths, the expanded HDMI signal end is prevented from being pulled up by 3.3V and leaking to a CPU (Central processing Unit), the circuit of the upper-level HDMI signal is prevented from being influenced, and if a plurality of multimedia signal interfaces need to be expanded, only the capacitor branch is needed to be added.
Since the HDMI signal transmission rate is high and there is a high requirement on signal integrity, the termination resistor 105 is reserved at the input end of the second-level multimedia interface 30 in this embodiment, so as to be conveniently used during impedance matching debugging, and ensure the signal quality of the HDMI signal when being transmitted in a line.
In some embodiments, the more expansion circuits of the HDMI signal, the greater the influence of the branches, and the higher the signal processing requirements. When a Printed Circuit Board (PCB) of the multimedia interface extension device is designed, the bifurcation length and the total length of HDMI signal wiring are strictly controlled, the bifurcation of the HDMI signal wiring is arranged on a bonding pad, the bifurcation of the wiring is led out from the bonding pad as much as possible, the bifurcation of branch circuits is reduced, and therefore the influence of the bifurcation of the wiring on the HDMI signal quality is reduced.
Referring to fig. 1, in some of these embodiments, the apparatus further comprises: the multimedia signal extension module 106, one end of the multimedia signal extension module 106 is connected to the multimedia signal extension module 101, the other end of the multimedia signal extension module 106 is connected to the second-level multimedia interface 30, and the multimedia signal extension module 106 is configured to extend a transmission distance of the extended multimedia signal.
The HDMI signal is input from the first-level multimedia interface 20 to the multimedia signal extension module 101, and needs to be transmitted to the second-level multimedia interface 30 after being extended and output, in this process, the HDMI signal is lost, and the multimedia signal extension module 106 can enhance the transmission capability of the extended HDMI signal, thereby extending the transmission distance of the extended multimedia signal.
In some embodiments, the extended HDMI signal needs to be connected to a level conversion chip or other buffer chip and then output to the second-level multimedia interface 30, and cannot be directly output. Some manufacturers produce embedded platforms with CPU (Central Processing Unit) circuits that output OD (Open Drain) gates inside, so in the conventional scheme, HDMI signals must be transmitted through pull-up resistors outside the HDMI interface. This results in a contradiction that the extension circuit of the HDMI signal requires a pull-up resistor and the external output cannot be connected to the pull-up resistor.
To solve this problem, in some embodiments, the multimedia signal extension module 106 includes a level conversion chip, and a pull-up resistor is disposed inside the level conversion chip.
In the embodiment, a level conversion chip is disposed in the multimedia signal extension module 106, and the pull-up in the circuit is realized by the pull-up inside the level conversion chip. The input interface of the level conversion chip contains a pull-up resistor, and the output is OD gate output, thus solving the contradiction that the expansion circuit of the HDMI signal needs the pull-up resistor and the external output can not be connected with the pull-up resistor.
In some embodiments, a signal repeater is disposed inside the level shift chip, and the signal repeater is used to enhance the driving capability of the expanded multimedia signal.
In the embodiment, the signal repeater (driver) is disposed inside the level shift chip to increase the driving capability of the HDMI signal, thereby achieving the effect of extending the HDMI transmission distance. In some embodiments, a level conversion chip with model number ASM1442K may be used to isolate the ASM1442K chip from the transmission line of the subsequent stage, so as to reduce the length of the HDMI signal path of the previous stage, minimize the loss and reflection of the high-speed signal during transmission, and extend the transmission distance of the HDMI.
In some embodiments, the multimedia signal extension module 106 includes a buffer chip for buffering the extended HDMI signal, so that the line has stable output impedance and better voltage transmission characteristics. In some embodiments, the buffer chip provides an internal pull-up function.
In some embodiments, a termination resistor 105 is disposed between the multimedia signal extension module 101 and the multimedia signal extension module 106, and the termination resistor serves as an impedance matching purpose at the input end of the level conversion chip or the buffer chip to reduce signal reflection.
Referring to fig. 1, in some of these embodiments, the apparatus further comprises: the multimedia signal conversion module 107, one end of the multimedia signal conversion module 107 is connected with the multimedia signal expansion module 101, the other end of the multimedia signal conversion module 107 is connected with the second-level multimedia interface 30, and the multimedia signal conversion module 107 includes a signal conversion chip for converting the expanded multimedia signal and transmitting the converted multimedia signal to the second-level multimedia interface 30.
In this embodiment, the multimedia signal conversion module 107 is internally provided with a signal conversion chip for converting the HDMI signal into other multimedia signals.
In some of these embodiments, the second level multimedia interface 30 comprises at least one of: VGA interface, DVI interface, SDI interface.
Taking the conversion from an HDMI signal to a VGA signal as an example, a signal conversion chip with the model number EP94Z1E is adopted, and due to the dc blocking and ac blocking effect of the capacitor 104, the internal pull-up of the EP94Z1E chip will not leak to the CPU to affect the normal operation of other circuits, and the expansion circuits will not affect each other.
In some embodiments, a termination resistor 105 is disposed between the multimedia signal expansion module 101 and the multimedia signal conversion module 107, and serves the purpose of impedance matching at the input end of the signal conversion chip to reduce signal reflection.
The multimedia interface extension device of the application has the following advantages:
(1) the expansion of the HDMI signal is completed by using simple discrete elements, the integrity problem of the signal in the expansion process is guaranteed, and the cost is greatly reduced;
(2) the purpose of prolonging the HDMI signal is achieved only by using the HDMI level conversion chip, so that the cost is low;
(3) the contradiction that the expansion circuit of the HDMI signal needs a pull-up resistor and the external output cannot be connected with the pull-up resistor is solved;
(4) the different interfaces after various extensions and conversions can be displayed simultaneously without mutual influence.
With reference to the multimedia interface extension apparatus in the foregoing embodiment, this embodiment further provides a multimedia interface extension device, and fig. 4 is a block diagram of a structure of a multimedia interface extension device implemented according to the present application, and as shown in fig. 4, the multimedia interface extension device includes: the first-level multimedia interface 20, the second-level multimedia interface 30 and the multimedia interface extension apparatus 10 of any of the above embodiments, an input terminal of the multimedia interface extension apparatus 10 is connected to the first-level multimedia interface 20, and an output terminal of the multimedia interface extension apparatus 10 is connected to the second-level multimedia interface 30, wherein the first-level multimedia interface 20 includes an HDMI interface.
Compared with the related art in which a dedicated integrated chip is used, the multimedia interface expansion device provided by the embodiment greatly reduces the cost, and the multimedia signal expansion module 101 can add a branching unit according to the requirement, thereby greatly improving the convenience of the HDMI interface expansion. Through the method and the device, the problem that the HDMI interface has weak expansion capability in the related technology is solved, and the expansion capability of the HDMI interface is improved.
It should be noted that, for specific examples in this embodiment, reference may be made to examples described in the foregoing embodiments and optional implementations, and details of this embodiment are not described herein again.
Fig. 5 is a schematic structural diagram of a multimedia interface extension apparatus according to a preferred embodiment of the present application, as shown in fig. 5, the apparatus includes: first HDMI interface 201, HDMI signal extension module 1011, HDMI signal extension module 1061, a plurality of HDMI changes VGA module 1071, second HDMI interface 301, a plurality of VGA interface 302, wherein, the output of first HDMI interface 201 and the input of HDMI signal extension module 1011 are connected, the output of HDMI signal extension module 1011 is connected to HDMI signal extension module 1061's input and a plurality of HDMI changes VGA module 1071's input respectively, the output of HDMI signal extension module 1061 is connected to the input of second HDMI interface 301, the output of a plurality of VGA interface 302 is connected to corresponding VGA interface 302 respectively.
Of course, although the preferred embodiment only shows one HDMI signal extension module 1061 and one second HDMI interface 301, in some embodiments, the multimedia interface extension device may include a plurality of HDMI signal extension modules 1061 and a plurality of second HDMI interfaces 301, and the preferred embodiment is not limited thereto.
It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A multimedia interface extension apparatus, comprising: the multimedia signal extension module comprises at least one shunt unit, each shunt unit comprises a first branch and a second branch, the first branch is provided with a capacitor, two ends of each shunt unit are respectively connected with a first-level multimedia interface and a second-level multimedia interface, each shunt unit is used for dividing signals of the first-level multimedia interface into two paths of multimedia signals and transmitting the two paths of multimedia signals to the second-level multimedia interface, and the first-level multimedia interface comprises an HDMI (high-definition multimedia interface).
2. The multimedia interface extension device of claim 1, wherein the second level multimedia interface comprises an HDMI interface and/or a VGA interface.
3. The multimedia interface extension device of claim 1, wherein a termination resistor is provided between each of the branching units and the second-level multimedia interface.
4. The multimedia interface extension device of claim 1, further comprising: and one end of the multimedia signal extension module is connected with the multimedia signal extension module, the other end of the multimedia signal extension module is connected with the second-level multimedia interface, and the multimedia signal extension module is used for extending the transmission distance of the extended multimedia signal.
5. The multimedia interface extension device of claim 4, wherein the multimedia signal extension module comprises a level conversion chip, and a pull-up resistor is arranged inside the level conversion chip.
6. The device as claimed in claim 5, wherein a signal repeater is disposed inside the level shift chip for enhancing the driving capability of the expanded multimedia signal.
7. The device of claim 4, wherein the multimedia signal extension module comprises a buffer chip.
8. The multimedia interface extension device of claim 1, further comprising: and one end of the multimedia signal conversion module is connected with the multimedia signal expansion module, the other end of the multimedia signal conversion module is connected with the second-level multimedia interface, and the multimedia signal conversion module comprises a signal conversion chip and is used for converting the expanded multimedia signal and transmitting the multimedia signal to the second-level multimedia interface.
9. The multimedia interface extension device of claim 8, wherein the second level multimedia interface comprises at least one of: VGA interface, DVI interface, SDI interface.
10. A multimedia interface extension device, comprising: a first level multimedia interface, a second level multimedia interface, and the multimedia interface extension apparatus according to any one of claims 1 to 9, wherein an input of the multimedia interface extension apparatus is connected to the first level multimedia interface, and an output of the multimedia interface extension apparatus is connected to the second level multimedia interface, and wherein the first level multimedia interface comprises an HDMI interface.
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