CN216795123U - Multimedia signal transmission circuit, electronic equipment and multimedia system - Google Patents
Multimedia signal transmission circuit, electronic equipment and multimedia system Download PDFInfo
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- CN216795123U CN216795123U CN202122953722.7U CN202122953722U CN216795123U CN 216795123 U CN216795123 U CN 216795123U CN 202122953722 U CN202122953722 U CN 202122953722U CN 216795123 U CN216795123 U CN 216795123U
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Abstract
The present disclosure relates to the field of signal communication technologies, and in particular, to a multimedia signal transmission circuit, an electronic device, and a multimedia system. A multimedia signal transmission circuit for use in an electronic device, the multimedia signal transmission circuit comprising: the input end of the multimedia signal processing chip is connected with the main control chip and is configured to process the signal sent by the main control chip to obtain a first multimedia signal; the input end of the repeater chip is connected with the output end of the multimedia signal processing chip and is configured to perform equalization processing on the first multimedia signal to obtain a target multimedia signal; and an output terminal connected to an output terminal of the repeater chip. In the embodiment of the disclosure, the electromagnetic interference generated by the multimedia connecting line is reduced, and devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting line, so that the cost of the connecting line is reduced.
Description
Technical Field
The present disclosure relates to the field of signal communication technologies, and in particular, to a multimedia signal transmission circuit, an electronic device, and a multimedia system.
Background
HDMI (High Definition Multimedia Interface) is a fully digital Multimedia communication standard, and has the advantages of High bandwidth, capability of transmitting uncompressed audio signals and High-resolution video signals, and the like.
In a common multimedia system, multimedia signal communication is realized between a main device and a display device through an HDMI connection line, the conventional HDMI connection line is no more than 3 meters, and for example, the HDMI connection line used in a scene such as a server room can be more than 10 meters. As the length of the HDMI connection line increases, high-speed signal radiation generated at the time of multimedia signal transmission also increases, causing electromagnetic interference, resulting in failure of an EMC (Electro Magnetic Compatibility) test of the connection line.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of electromagnetic interference during multimedia signal transmission, embodiments of the present disclosure provide a multimedia signal transmission circuit, an electronic device, and a multimedia system.
In a first aspect, the disclosed embodiments provide a multimedia signal transmission circuit applied to an electronic device, where the multimedia signal transmission circuit includes:
the input end of the multimedia signal processing chip is connected with the main control chip and is configured to process the signal sent by the main control chip to obtain a first multimedia signal;
the input end of the repeater chip is connected with the output end of the multimedia signal processing chip and is configured to perform equalization processing on the first multimedia signal to obtain a target multimedia signal; and
and an output terminal connected to an output terminal of the repeater chip.
In some embodiments, the repeater chip comprises:
and the equalizer circuit is used for carrying out equalization processing on the first multimedia signal according to a preset amplitude value.
In some embodiments, the repeater chip further comprises:
and the sampling circuit is respectively connected with the input end and the output end of the repeater chip and is used for sampling and comparing signals of the input end and the output end of the repeater chip.
In some embodiments, the multimedia signal transmission circuit further includes:
and the input end of the filter circuit is connected with the output end of the repeater chip, the output end of the filter circuit is connected with the output terminal, and the filter circuit is used for filtering the target multimedia signal.
In some embodiments, the multimedia signal transmission circuit further includes:
and the electrostatic protection device is arranged on a connecting channel between the repeater chip and the output terminal.
In some embodiments, the multimedia signal comprises an HDMI signal, the multimedia signal processing chip comprises an HDMI processing chip, the repeater chip comprises an HDMI repeater chip, and the output terminal comprises an HDMI output terminal.
In some embodiments, the multimedia signal comprises a DVI signal, the multimedia signal processing chip comprises a DVI processing chip, the repeater chip comprises a DVI repeater chip, and the output terminal comprises a DVI output terminal.
In some embodiments, the master chip includes at least one of a CPU, GPU, or SoC.
In a second aspect, the disclosed embodiments provide an electronic device, including:
a main board, on which a multimedia signal transmission circuit according to any one of the embodiments of the first aspect is disposed.
In a second aspect, the disclosed embodiments provide a multimedia system, including:
the electronic device according to any of the embodiments of the second aspect;
a display device provided with an input terminal; and
and two ends of the multimedia connecting wire are respectively connected with the output terminal of the electronic equipment and the input terminal of the display equipment.
In some embodiments, the length of the multimedia connection line is no less than 3 meters.
The multimedia signal transmission circuit comprises a multimedia signal processing chip, a repeater chip and an output terminal, wherein the input end of the multimedia signal processing chip is connected with a main control chip and is configured to process a signal sent by the main control chip to obtain a first multimedia signal, the input end of the repeater chip is connected with the output end of the multimedia signal processing chip and is configured to perform equalization processing on the first multimedia signal to obtain a target multimedia signal, and the output terminal is connected with the output end of the repeater chip. In the embodiment of the disclosure, the relay chip is utilized to perform equalization processing on the multimedia signal at the electronic equipment end, so that the signal amplitude output to the connecting line is reduced, the electromagnetic interference generated by the multimedia connecting line is reduced, and the connecting line with a larger length is particularly beneficial to meeting the electromagnetic interference test. In addition, devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting wire, and the cost of the connecting wire is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a multimedia signal transmission circuit according to some embodiments of the present disclosure.
Fig. 2 is a block diagram of a repeater chip in some embodiments according to the present disclosure.
Fig. 3 is a block diagram of a multimedia signal transmission circuit according to some embodiments of the present disclosure.
FIG. 4 is a block diagram of an electronic device in accordance with some embodiments of the present disclosure.
Fig. 5 is a block diagram of a multimedia system according to some embodiments of the present disclosure.
Detailed Description
The technical solutions of the present disclosure will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. In addition, technical features involved in different embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.
HDMI (High Definition Multimedia Interface) is a fully digital Multimedia communication standard, and can provide a data transmission bandwidth of up to 10.2Gbps, and can transmit uncompressed audio signals and High-resolution video signals, and meanwhile, does not need digital-to-analog or analog-to-digital conversion before signal transmission, and can ensure the transmission of the highest-quality audio and video signals. Therefore, HDMI is widely used in various multimedia devices, such as a television set-top box, a DVD (Digital Video Disc) player, a personal computer, a Digital audio device, and a server.
In the related art, a communication connection is established between a main device and a display device of a multimedia system through an HDMI connection line, so that a multimedia signal of the main device is transmitted to the display device through the HDMI connection line for output and display. Taking a desktop computer as an example, the host is provided with an HDMI output interface, the display is provided with an HDMI input interface, and the two are in communication connection through an HDMI connection line.
The conventional HDMI connecting line is not more than 3 meters, and for scenes such as a server room, the distance between a server and display equipment is often far, and in addition, the length of the HDMI connecting line can reach 10 meters or even more than 10 meters due to the length of a redundant line reserved for cable maintenance. For example, when the host transmits an HDMI signal, the host outputs the radiation of a high-speed signal such as a network interface clock through the HDMI interface, thereby generating large electromagnetic interference, which results in that an EMC (Electro Magnetic Compatibility) test cannot pass. In order to eliminate the electromagnetic interference of the HDMI connection line, an electromagnetic shielding circuit or an electromagnetic shield is often added to the connection line in the related art, resulting in an increase in the cost of the HDMI connection line.
Based on the above-mentioned drawbacks in the related art, the embodiments of the present disclosure provide a multimedia signal transmission circuit, so as to reduce the amplitude of an output signal at a main device end of multimedia signal transmission, and reduce the electromagnetic interference generated by a multimedia connection line with a large length.
The embodiment of the disclosure provides a multimedia signal transmission circuit, which can be applied to electronic equipment. The electronic device of the embodiments of the present disclosure may be any device type having a multimedia signal output function, for example, a television set top box, a personal computer, a DVD player, a digital audio device, a server, and the like, which is not limited by the present disclosure.
As shown in fig. 1, in some embodiments, a multimedia signal transmission circuit of an example of the present disclosure includes: a multimedia signal processing chip 20, a repeater chip 30, and an output terminal 50.
The input end of the multimedia signal processing chip 20 is connected with the main control chip 10 of the electronic device. In the embodiment of the present disclosure, the main control chip 10 is a multimedia signal input source of the electronic device, which is used for generating multimedia signals required for displaying images or videos.
In some embodiments, the main control Chip 10 may be any Chip suitable for implementing multimedia signal output, for example, a Central Processing Unit (CPU) Chip, a Graphics Processing Unit (GPU), a System on Chip (SoC), and the like, which is not limited by the present disclosure.
The multimedia signal processing chip 20 receives the multimedia signal sent by the main control chip, and performs conversion, amplification and other processing on the multimedia signal to obtain a first multimedia signal meeting the transmission protocol standard.
For example, in an example, taking the HDMI communication standard as an example, the multimedia signal processing chip 20 may be an HDMI processing chip. The multimedia signal processing chip 20 receives the multimedia signal sent by the main control chip, and performs conversion processing on the multimedia signal to obtain an HDMI differential signal, that is, a first multimedia signal.
For another example, the multimedia signal processing chip 20 may be a DVI (Digital Visual Interface) processing chip, for example, in a DVI communication standard. The multimedia signal processing chip 20 receives the multimedia signal sent by the main control chip and performs conversion processing on the multimedia signal to obtain a DVI signal, that is, a first multimedia signal.
It will be understood by those skilled in the art that the transmission protocol standard of the multimedia signal in the embodiment of the present disclosure is not particularly limited, and may be any multimedia transmission standard suitable for implementation, and the present disclosure does not enumerate this.
The input terminal of the repeater chip 30 is connected to the output terminal of the multimedia signal processing chip 20, so that the repeater chip 30 receives the first multimedia signal sent by the multimedia signal processing chip 20. In the embodiment of the present disclosure, the repeater chip 30 performs an equalization process on the first multimedia signal output by the multimedia signal processing chip 20 to reduce the signal amplitude of the first multimedia signal.
It should be noted that, in the transmission process of the multimedia signal, the inventor of the present application finds, through research, that the amplitude of the output first multimedia signal is often higher after the multimedia signal processing chip converts and amplifies the multimedia signal, and therefore the amplitude of the high-speed interference signal doped in the first multimedia signal is also higher, so that the electromagnetic interference of the connection line exceeds the standard under the condition of longer length of the connection line.
For example, HDMI signal transmission is adopted, HDMI differential signals output by the multimedia signal processing chip 20 are often doped with high-speed interference signals such as a network port clock, and as the length of an HDMI connection line increases, the electromagnetic shielding capability of the connection line is weaker, and electromagnetic radiation generated by the high-speed interference signals is enhanced, so that the electromagnetic interference of the connection line exceeds the standard.
Therefore, in the embodiment of the present disclosure, the first multimedia signal processed by the multimedia signal processing chip 20 is not directly output to the connection line, but the repeater chip 30 is used to perform an equalization process on the first multimedia signal, so as to reduce the amplitude of the first multimedia signal and obtain the target multimedia signal. As the amplitude of the target to the media signal is reduced, the amplitude of a high-speed interference signal existing in the target to the media signal is reduced, the electromagnetic radiation of the connecting line is reduced, and the electromagnetic interference test requirement is met. Moreover, for multimedia signals such as HDMI and DVI, the signals are all digital communication, that is, the transmitted multimedia signals are all high and low levels represented by 1 or 0, so that the imaging effect is not influenced by reducing the signal amplitude.
The output terminal 50 is an output port to which an external connection line is connected, and is connected to an output terminal of the repeater chip 30. In some embodiments, the output terminal 50 is connected to a connection line by hot-plugging, so that the target multimedia signal output from the repeater chip 30 is transmitted to the display device through the connection line.
In some embodiments, the multimedia signal is an HDMI signal, the repeater chip 30 can be an HDMI repeater chip, and the output terminal 50 can be an HDMI output interface. Of course, those skilled in the art will understand that the embodiments of the present disclosure are not limited to HDMI signal transmission, and when the multimedia signal is a signal of other standard, the repeater chip 30 and the output terminal 50 are configured to correspond to the standard hardware, for example, in other embodiments, the multimedia signal is a DVI signal, the multimedia signal processing chip 20 may be a DVI processing chip, the repeater chip 30 may be a DVI repeater chip, and the output terminal 50 may be a DVI output interface. This disclosure is not further enumerated here.
Therefore, in the embodiment of the disclosure, the multimedia signal is equalized by using the repeater chip at the electronic device end, so that the signal amplitude output to the connecting line is reduced, the electromagnetic interference generated by the multimedia connecting line is reduced, and the connecting line with a large length is particularly beneficial to meeting the electromagnetic interference test. In addition, devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting wire, and the cost of the connecting wire is reduced.
As shown in fig. 2, in some embodiments, the repeater chip 30 includes an equalizer circuit 31 and a sampling circuit 32.
The equalizer circuit 31 is used for equalizing the first multimedia signal output by the multimedia signal processing chip 20 according to a preset amplitude. Specifically, the preset amplitude may be a signal amplitude predetermined according to multiple tests or a priori knowledge, and when the amplitude of the output multimedia signal exceeds the preset amplitude, a larger electromagnetic radiation may be generated, so that the electromagnetic interference of the connection line exceeds the standard.
Therefore, in the embodiment of the present disclosure, the first multimedia signal output by the multimedia signal processing chip 20 passes through the equalizer circuit 31, and the equalizer circuit 31 performs an equalization process on the multimedia signal exceeding the preset amplitude value to obtain the target multimedia signal and output the target multimedia signal.
The sampling circuit 32 is connected to the input terminal and the output terminal of the repeater chip 30, respectively, so that the sampling circuit 320 samples signals of the input terminal and the output terminal, respectively, and compares the magnitude of the input terminal signal and the magnitude of the input terminal signal. When the amplitude of the input and/or output signal is large, the equalizer circuit 31 is controlled to perform equalization processing on the input signal. When the amplitude of the input and/or output signal is small, the equalizer circuit 31 is controlled without equalizing the signal.
Therefore, in the embodiment of the disclosure, the multimedia signal is equalized by using the repeater chip at the electronic device end, so that the signal amplitude output to the connecting line is reduced, the electromagnetic interference generated by the multimedia connecting line is reduced, and the connecting line with a large length is particularly beneficial to meeting the electromagnetic interference test. In addition, devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting wire, and the cost of the connecting wire is reduced.
As shown in fig. 3, in some embodiments, the multimedia signal transmission circuit of the present disclosure further includes a filter circuit 41 and an electrostatic protection device 42.
The input end of the filter circuit 41 is connected to the output end of the repeater chip 30, and functions to filter the target multimedia signal output by the repeater chip 30, so as to improve the signal-to-noise ratio of the multimedia signal, on one hand, improve the imaging quality, and on the other hand, reduce the electromagnetic radiation generated by the interference signal.
In the embodiment of the present disclosure, the filter circuit 41 may include a high-pass filter, a low-pass filter, or a band-pass filter, and the present disclosure is not limited thereto.
The electrostatic protection device 42 is disposed on a signal path between the repeater chip 30 and the output terminal 50, and the electrostatic protection device 42 is used for performing electrostatic protection on the electronic device to prevent the high voltage electrostatic breakdown from damaging the circuit. In some embodiments, the electrostatic protection device 42 may include a TVS (Transient Voltage super).
In the embodiment shown in fig. 3, the multimedia signal output by the main control chip 10 is transmitted to the multimedia signal processing chip 20. The multimedia signal processing chip 20 performs conversion processing on the received multimedia signal to obtain a first multimedia signal, and outputs the first multimedia signal to the repeater chip 30. The repeater chip 30 performs equalization processing on the first multimedia signal through the equalizer circuit 31 and the sampling circuit 32 to obtain a target multimedia signal. The target multimedia signal is filtered by the filter circuit 41 and then transmitted to the output terminal 50 through the electrostatic protection device 42. After the output terminal 50 is connected to the display device through the connection line, the target multimedia signal is transmitted to the display device through the connection line to be imaged.
Therefore, in the embodiment of the disclosure, the multimedia signal is equalized by using the repeater chip at the electronic device end, so that the signal amplitude output to the connecting line is reduced, the electromagnetic interference generated by the multimedia connecting line is reduced, and the connecting line with a large length is particularly beneficial to meeting the electromagnetic interference test. In addition, devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting wire, and the cost of the connecting wire is reduced.
The embodiment of the disclosure provides an electronic device, which includes a main board, wherein the main board is provided with the multimedia signal transmission circuit.
In some embodiments, the electronic device of the embodiments of the present disclosure may be any device type having a multimedia signal output function, such as a television set-top box, a personal computer, a DVD player, a digital audio device, a server, and the like, which is not limited by the present disclosure.
In some embodiments, the electronic device 400 of the present disclosure is a host of a desktop computer, as shown in fig. 4, the host includes a motherboard 410, the multimedia signal transmission circuit described in any of the above embodiments is integrated on the motherboard 410, and the output terminal 50 is an output port of the motherboard 410.
Therefore, in the embodiment of the disclosure, the multimedia signal is subjected to equalization processing by using the repeater chip at the electronic device end, so that the signal amplitude output to the connecting line is reduced, the electromagnetic interference generated by the multimedia connecting line is reduced, and the connecting line with a large length is particularly beneficial to meeting the electromagnetic interference test. In addition, devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting wire, and the cost of the connecting wire is reduced.
The disclosed embodiments provide a multimedia system, which can realize the display and play of multimedia through multimedia signal communication.
As shown in fig. 5, in some embodiments, the multimedia system of the present disclosure includes the electronic device 400, the display device 600, and the multimedia connection line 500 described in any of the foregoing embodiments.
Based on the above, the electronic apparatus 400 is provided with the output terminal 50, and the display apparatus 600 is provided with the input terminal 610. Accordingly, both ends of the multimedia connection line 500 may be connected to the output terminal 50 and the input terminal 610, respectively, thereby establishing a multimedia communication connection of the electronic device 400 and the display device 600.
In an example, for the HDMI signal transmission between the host and the display of the desktop computer, the electronic device 400 is the host, the display device 600 is the display, and the multimedia connection line 500 is the HDMI connection line. The host and the display establish multimedia communication connection through the HDMI connecting line. In this example, as can be seen from the foregoing, the multimedia signal output by the electronic device is transmitted to the display through the HDMI connection line, so as to realize display imaging.
In some embodiments, the length L of the multimedia connection line of the disclosed examples is not less than 3 meters. Taking the HDMI connection line as an example, through EMC electromagnetic interference testing, the multimedia connection line of the embodiment of the present disclosure can ensure that EMC test standards are met under the condition that the length exceeds 10 meters.
It is understood that the multimedia system according to the embodiments of the present disclosure may be any multimedia communication system suitable for implementation, and is not limited to the above examples, and the communication between the electronic device and the display device is not limited to HDMI communication, and may also be any other communication standard suitable for implementation, which is not described in detail herein.
Therefore, in the embodiment of the disclosure, the multimedia signal is equalized by using the repeater chip at the electronic device end, so that the signal amplitude output to the connecting line is reduced, the electromagnetic interference generated by the multimedia connecting line is reduced, and the connecting line with a large length is particularly beneficial to meeting the electromagnetic interference test. In addition, devices such as an electromagnetic shield and the like do not need to be additionally arranged on the connecting wire, and the cost of the connecting wire is reduced.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the present disclosure may be made without departing from the scope of the present disclosure.
Claims (10)
1. A multimedia signal transmission circuit, applied to an electronic device, the multimedia signal transmission circuit comprising:
the input end of the multimedia signal processing chip is connected with the main control chip and is configured to process the signal sent by the main control chip to obtain a first multimedia signal;
the input end of the repeater chip is connected with the output end of the multimedia signal processing chip and is configured to perform equalization processing on the first multimedia signal to obtain a target multimedia signal; and
and an output terminal connected to an output terminal of the repeater chip.
2. The multimedia signal transmission circuit of claim 1, wherein the repeater chip comprises:
and the equalizer circuit is used for carrying out equalization processing on the first multimedia signal according to a preset amplitude value.
3. The multimedia signal transmission circuit of claim 2, wherein the repeater chip further comprises:
and the sampling circuit is respectively connected with the input end and the output end of the repeater chip and is used for sampling and comparing signals of the input end and the output end of the repeater chip.
4. The multimedia signal transmission circuit according to any one of claims 1 to 3, further comprising:
and the input end of the filter circuit is connected with the output end of the repeater chip, the output end of the filter circuit is connected with the output terminal, and the filter circuit is used for filtering the target multimedia signal.
5. The multimedia signal transmission circuit according to any one of claims 1 to 3, further comprising:
and the electrostatic protection device is arranged on a connecting channel between the repeater chip and the output terminal.
6. The multimedia signal transmission circuit of claim 1,
the multimedia signal comprises an HDMI signal, the multimedia signal processing chip comprises an HDMI processing chip, the repeater chip comprises an HDMI repeater chip, and the output terminal comprises an HDMI output terminal.
7. The multimedia signal transmission circuit of claim 1,
the multimedia signal includes the DVI signal, the multimedia signal processing chip includes DVI processing chip, the repeater chip includes DVI repeater chip, output terminal includes the DVI output terminal.
8. An electronic device, comprising:
a main board on which the multimedia signal transmission circuit according to any one of claims 1 to 7 is provided.
9. A multimedia system, comprising:
the electronic device of claim 8;
a display device provided with an input terminal; and
and two ends of the multimedia connecting wire are respectively connected with the output terminal of the electronic equipment and the input terminal of the display equipment.
10. The multimedia system of claim 9,
the length of the multimedia connecting line is not less than 3 meters.
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| CN202122953722.7U CN216795123U (en) | 2021-11-29 | 2021-11-29 | Multimedia signal transmission circuit, electronic equipment and multimedia system |
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| CN202122953722.7U CN216795123U (en) | 2021-11-29 | 2021-11-29 | Multimedia signal transmission circuit, electronic equipment and multimedia system |
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