CN111669533B - Signal distribution equipment - Google Patents
Signal distribution equipment Download PDFInfo
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- CN111669533B CN111669533B CN202010500827.4A CN202010500827A CN111669533B CN 111669533 B CN111669533 B CN 111669533B CN 202010500827 A CN202010500827 A CN 202010500827A CN 111669533 B CN111669533 B CN 111669533B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
- H04N7/035—Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
Abstract
The utility model relates to a signal distribution device, belonging to the technical field of signal distribution, comprising an audio input interface for inputting the collected audio signal; the video input interface is used for inputting the collected video signals; the keyboard input interface is used for inputting the collected keyboard signals; the signal distribution unit is respectively electrically connected with the audio input interface, the video input interface and the keyboard input interface, is used for synchronizing the keyboard signal with the audio signal and/or the video signal and distributing the synchronized audio signal, video signal and keyboard signal; and the signal output interface is electrically connected with the signal distribution unit and is used for outputting the distributed audio signals, video signals and keyboard signals. The embodiment of the disclosure directly synchronizes and distributes the collected audio signal, video signal and keyboard signal without uploading to a signal distribution system and then processing, so that the system can work under the condition of no network, has wide application range and improves the working efficiency.
Description
Technical Field
The present disclosure relates to the field of signal distribution technologies, and in particular, to a signal distribution device.
Background
At present, in the network condition, the prior art generally uploads the collected keyboard signal to the signal distribution system directly through the network port of the collection device. In the field of video monitoring, the operation is usually required under a network-free condition, so that the scheme in the prior art cannot be implemented. There are still major difficulties in how to combine and distribute the keyboard signals and other signals under the condition of no network.
Disclosure of Invention
To solve the above technical problem or to at least partially solve the above technical problem, the present disclosure provides a signal distribution apparatus.
The present disclosure provides a signal distribution apparatus including:
the audio input interface is used for inputting the collected audio signals;
the video input interface is used for inputting the collected video signals;
the keyboard input interface is used for inputting the collected keyboard signals;
the signal distribution unit is respectively electrically connected with the audio input interface, the video input interface and the keyboard input interface, is used for synchronizing the keyboard signal with the audio signal and/or the video signal and distributing the synchronized audio signal, video signal and keyboard signal;
and the signal output interface is electrically connected with the signal distribution unit and is used for outputting the distributed audio signals, video signals and keyboard signals.
In some embodiments, the signal distribution apparatus further comprises:
the signal compression unit is arranged between the signal distribution unit and the signal output interface;
the distributed audio signals comprise audio signals to be compressed, the distributed video signals comprise video signals to be compressed and video loopback signals, and the distributed keyboard signals comprise keyboard signals to be transmitted and keyboard loopback signals;
the signal compression unit is used for carrying out compression coding on the audio signal to be compressed and the video signal to be compressed to obtain a compressed signal.
In some embodiments, the signal output interface comprises:
the video signal loopback interface is used for outputting a video loopback signal;
the keyboard signal loopback interface is used for outputting a keyboard loopback signal;
a compressed signal output interface for outputting a compressed signal;
and the serial input and output interface is used for outputting the keyboard signal to be transmitted.
In some embodiments, the signal distribution apparatus further comprises:
and the signal storage unit is electrically connected with the signal distribution unit and is used for storing the audio signal, the video signal and the keyboard signal as well as the distributed audio signal, the video signal and the keyboard signal.
In some embodiments, the signal distribution apparatus further comprises:
and the configuration unit is electrically connected with the signal distribution unit and is used for configuring and debugging the signal distribution unit.
In some embodiments, the signal distribution apparatus further comprises:
and the power supply module is electrically connected with the signal distribution unit and used for supplying power to the signal distribution equipment.
In some embodiments, the signal distribution unit is an FPGA chip; the signal compression unit includes at least one of a Hi3519AV100 chip, a Hi3519V101 chip, and an h.265 high definition video encoder.
In some embodiments, the video input interface and the video signal loopback interface comprise at least one of an RGBHV interface, a VGA interface, and a DVI interface;
the keyboard input interface and the keyboard signal loopback interface comprise at least one of a USB interface, a PS2 interface and a serial interface.
In some embodiments, the signal storage unit includes at least one of SDRAM, DDR, and Flash.
In some embodiments, the configuration unit is a JTAG loading circuit, and the JTAG loading circuit includes an interface circuit, a bus transceiver circuit, and a bus switch circuit that are electrically connected in sequence; the interface circuit is a 302-2S chip, the bus transceiver circuit is an SN74LVC245A chip, and the bus switch circuit is an NC7SZ66 chip.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the collected audio signals, video signals and keyboard signals are directly synchronized and distributed without being uploaded to a signal distribution system and then processed, so that the system can work under the condition of no network, the application range is wide, and the working efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a block diagram of a signal distribution apparatus according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a signal distribution apparatus according to another embodiment of the disclosure;
fig. 3 is a circuit diagram of a JTAG loading circuit provided by an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
For the network condition, the prior art generally directly uploads the collected keyboard signal to the signal distribution system through the network port of the collection device. In the field of video monitoring, the signal distribution equipment provided by the embodiment of the disclosure can directly synchronize and distribute the acquired audio signals, video signals and keyboard signals without uploading to a signal distribution system for processing, so that the signal distribution equipment can work under the network-free condition, has a wide application range, and improves the working efficiency.
Specifically, fig. 1 is a block diagram of a signal distribution device according to an embodiment of the present disclosure, as shown in fig. 1, including:
an audio input interface 100 for inputting a collected audio signal;
a video input interface 200 for inputting the collected video signal;
a keyboard input interface 300 for inputting the collected keyboard signals;
the signal distribution unit 400 is electrically connected with the audio input interface 100, the video input interface 200 and the keyboard input interface 300 respectively, and is used for synchronizing the keyboard signal with the audio signal and/or the video signal and distributing the synchronized audio signal, video signal and keyboard signal;
and a signal output interface 500 electrically connected to the signal distribution unit 400, for outputting the distributed audio signal, video signal and keyboard signal.
In the embodiment of the present disclosure, the audio device, the video device, and the keyboard device input respective audio signals, video signals, and keyboard signals to the signal distribution device by connecting the audio input interface, the video input interface, and the keyboard input interface, respectively. The audio device may be a built-in sound pickup in the signal distribution device, or may be an external device, and the video device may be a monitoring camera, which is not particularly limited in the embodiments of the present disclosure.
The signal distribution unit processes the collected signals in two steps, the first step needs to synchronize the keyboard signals with the audio signals and the video signals, and then the synchronized audio signals, video signals and keyboard signals are distributed according to actual requirements.
The signal output interface comprises a plurality of output interfaces, and the distributed audio signals, video signals and keyboard signals are output through the corresponding signal output interfaces.
In addition, the audio input interface, the video input interface, the keyboard input interface, the signal distribution unit and the signal output interface are integrated on one board card, so that the volume of the signal distribution equipment is reduced.
It should be noted that other kinds of signals and keyboard signals can also be synchronized and distributed according to actual needs, and are not limited to audio signals and video signals, and the embodiments of the present disclosure are not particularly limited.
The signal distribution equipment provided by the embodiment of the disclosure can directly synchronize and distribute the collected audio signals, video signals and keyboard signals without uploading to a signal distribution system and then processing, so that the signal distribution equipment can work under the condition of no network, has a wide application range and improves the working efficiency.
In some embodiments, on the basis of the signal distribution apparatus shown in fig. 1, as shown in fig. 2, the signal distribution apparatus further includes:
a signal compression unit 600 disposed between the signal distribution unit 400 and the signal output interface 500;
the distributed audio signals comprise audio signals to be compressed, the distributed video signals comprise video signals to be compressed and video loopback signals, and the distributed keyboard signals comprise keyboard signals to be transmitted and keyboard loopback signals;
the signal compression unit 600 is configured to perform compression coding on an audio signal to be compressed and a video signal to be compressed to obtain a compressed signal.
In the embodiment of the disclosure, after being distributed, the signal is mainly divided into two paths of output, one path is a signal to be compressed, and after being compressed together with other signals, the signal is uploaded to a host device for storage; and the other path is a loop-back signal which is output to the display console through a corresponding output interface.
Under the network condition, if the distributed signals are to be uploaded to the device host for storage, when the data volume to be uploaded is large, or the network bandwidth is small and the transmission speed is slow, the signal compression unit in the embodiment of the disclosure can compress and encode the audio signals to be compressed and the video signals to be compressed, thereby reducing the data volume to be uploaded and improving the data transmission speed. In addition, the data transmission speed is improved, so that the data amount needing to be buffered is reduced, and the storage space of the signal distribution equipment is saved.
It should be noted that, the keyboard signal usually has a small data size, so that the keyboard signal to be transmitted obtained after the keyboard signal is distributed can be directly transmitted without performing encoding compression. However, it should be understood by those skilled in the art that the keyboard signal to be transmitted obtained after the keyboard signal is distributed may also be encoded and compressed according to actual requirements and then transmitted, and the embodiment of the present disclosure is not limited in particular.
In some embodiments, based on the signal distribution apparatus shown in fig. 1, as shown in fig. 2, the signal output interface 500 includes:
a video signal loopback interface 510 for outputting a video loopback signal;
a keyboard signal loopback interface 520 for outputting a keyboard loopback signal;
a compressed signal output interface 530 for outputting a compressed signal;
the serial input/output interface 540 is used for outputting the keyboard signal to be transmitted.
In the embodiment of the present disclosure, a corresponding signal output interface is provided according to the type of the signal. The compression signal output interface may be a gigabit network interface, and the serial input/output interface may be an RS232 interface, an RS422 interface, and an RS485 interface, which are not specifically limited in the embodiment of the present disclosure.
In some embodiments, on the basis of the signal distribution apparatus shown in fig. 1, as shown in fig. 2, the signal distribution apparatus further includes:
and a signal storage unit 700 electrically connected to the signal distribution unit 400 for storing the audio signal, the video signal and the keyboard signal, and the distributed audio signal, video signal and keyboard signal.
In the embodiment of the disclosure, the signal distribution device is provided with a signal storage unit, which is used for temporarily storing the audio signal, the video signal and the keyboard signal when the network bandwidth is small and the transmission speed is slow, and the distributed audio signal, the video signal and the keyboard signal, so as to prevent data loss.
In some embodiments, on the basis of the signal distribution apparatus shown in fig. 1, as shown in fig. 2, the signal distribution apparatus further includes:
and the configuration unit 800 is electrically connected with the signal distribution unit 400 and is used for configuring and debugging the signal distribution unit.
In the embodiment of the disclosure, the signal distribution device is provided with a configuration unit, and the configuration unit can perform parameter configuration and function debugging on the signal distribution unit, so that the signal distribution unit can meet the use requirements in different scenes.
In some embodiments, on the basis of the signal distribution apparatus shown in fig. 1, as shown in fig. 2, the signal distribution apparatus further includes:
and a power module 900 electrically connected to the signal distribution unit 400 for supplying power to the signal distribution apparatus.
It should be noted that, since the audio signal collected by the built-in sound pickup includes an analog signal, in order to prevent the power supply from interfering with the signal, if the signal distribution unit is provided with the built-in sound pickup, the built-in sound pickup and the signal distribution unit need to be powered by a linear power supply.
In some embodiments, the signal distribution unit 400 is an FPGA chip; the signal compression unit 600 includes at least one of a Hi3519AV100 chip, a Hi3519V101 chip, and an h.265 high definition video encoder.
In the embodiment of the present disclosure, the signal distribution unit may be, for example, an FPGA chip, and the FPGA chip may be repeatedly programmed, so that the use requirements in different scenarios may be met, thereby effectively reducing the design cost and completing complex data processing and logic control.
The signal compression unit compresses the video signal to be compressed by using a video compression algorithm h.264 or h.265, for example, a Hi3519AV100 chip, a Hi3519V101 chip and a h.265 high-definition video encoder can be used. In addition, in order to avoid interface conversion, an H.265 high-definition video encoder can be selected, and the H.265 high-definition digital video compression technology has the advantages of stable compression speed, high definition of compressed video, low code rate, low transmission delay and the like. And the H.265 high-definition video encoder is small in size and convenient to install, and the power consumption of the H.265 high-definition video encoder is smaller than 5W under the normal condition, so that the electric energy can be effectively saved, and the safety of equipment is improved.
In addition, the signal compression unit in the embodiment of the present disclosure further supports 1920 × 1080@60Hz video signal input and gigabit port output, so as to satisfy compression of high definition video signals and improve higher data transmission speed.
And after being compressed, the signal to be compressed is output in a standard TS network flow form. Compared with the existing compression mode adopting hard coding, which causes the unstable work of the acquisition equipment system, the audio and video acquisition equipment system provided by the embodiment of the disclosure is stable, and can be widely applied to various occasions needing to acquire high-definition video signals and high-resolution and high-frame rates and transmitting the signals based on an IP network. In addition, the signal distribution device provided by the embodiment of the disclosure has strong expansibility, so that the requirements of different industries can be met, for example, the low-latency property of coding compression can enable the signal distribution device provided by the embodiment of the disclosure to be used for live video.
In some embodiments, video input interface 200 and video signal loopback interface 510 comprise at least one of an RGBHV interface, a VGA interface, and a DVI interface;
The signal distribution equipment provided by the embodiment of the disclosure is provided with various input and output interfaces, has better universality and can meet the access requirements of different types of equipment.
In particular, the RGBHV interface and the VGA interface can be selected from the existing Y11 series circular sealing electric connectors, and the series electric connectors have the advantages of high connection speed, high separation speed, small volume, light weight and the like. The connection of the electrical connector can be, for example, an internal bayonet locking, and the contact terminals of the electrical connector are soldered. In addition, the shell of the electric connector has a shielding type and a non-shielding type, and can be selected according to actual requirements.
The DVI interface can select the existing YMG type differential electric connector, and the YMG type differential electric connector can be used for transmitting a patch panel and a display screen interface of DVI high-definition digital video signals. In addition, the YMG type differential electric connector has the characteristics of high differential digital transmission speed, low power consumption, low bit error rate, low radiation, small crosstalk, five-key positioning identification, small contact resistance, soft plugging and unplugging, corrosion resistance, humidity and heat resistance, vibration and impact resistance, electromagnetic interference resistance shielding, high reliability and the like, so that the YMG type differential electric connector is suitable for data transmission of gigabit networks and high-definition images.
In addition, because the keyboard signal is usually a digital signal with low transmission speed, and the audio signal is usually a low-frequency analog signal, the keyboard input interface, the keyboard signal loopback interface and the audio input interface can meet the acquisition requirement in most scenes by selecting the existing Y11 series circular sealed electric connector.
It should be noted that the input and output interfaces may also adopt other types of interfaces according to actual needs, and the embodiments of the present disclosure are not particularly limited.
In some embodiments, signal storage unit 700 includes at least one of SDRAM, DDR, and Flash.
The signal storage unit in the embodiment of the present disclosure may adopt existing SDRAM, DDR and Flash (e.g., NAND Flash and NOR Flash) storage units. Under different scenes, one of the scenes can be selected respectively.
Specifically, Flash has stable storage capacity, stored data is not easy to lose under the condition of low electric quantity of equipment, but Flash has higher use cost than SDRAM and DDR, so that SDRAM and DDR are preferentially adopted in a common application scene.
The SDRAM is characterized in that data is read at the rising edge of each clock, and the data pre-reading width is 1 bit; the DDR adopts a DLL (delay Locked loop) technology, so that data can be read at both the rising edge and the falling edge of a clock, and the data pre-reading width is 2 bits, so that the read-write speed of the DDR is doubled compared with that of the SDRAM under the condition of not increasing the clock.
In addition, compared with DDR, DDR2 reduces power consumption, and the data pre-reading width is increased to 4 bits, so the data reading and writing speed is doubled compared with DDR. In the same way, the data read-write speed of the DDR3 is doubled compared with the DDR2 speed, and the power consumption is continuously reduced.
Therefore, when actually designing the signal storage unit, one or a combination of several of the signal storage units may be selected and used in consideration of storage stability, design cost, data read-write speed, and expandability, and the embodiment of the present disclosure is not particularly limited.
In some embodiments, as shown in fig. 3, the configuration unit 800 is a JTAG loading circuit, which includes an interface circuit, a bus transceiver circuit, and a bus switch circuit electrically connected in sequence; the interface circuit is a 302-2S chip, the bus transceiver circuit is an SN74LVC245A chip, and the bus switch circuit is an NC7SZ66 chip.
Specifically, when the signal distribution unit selects the FPGA chip, the program loading of the FPGA chip has three modes of active loading, passive loading and JTAG loading, so that a corresponding loading mode can be selected according to actual requirements.
As a preferred embodiment, JTAG loading is the simplest of three loading modes, so the JTAG loading circuit can be selected to configure and debug the FPGA chip in a normal application scenario. The bus transceiver circuit can use an octal bus transceiver SN74LVC245A chip to complete the programming of the bit stream, and the bus switch circuit controls the transmission direction of the bus, for example, a single SPST bus switch NC7SZ66 chip can be used. The specific circuit connection is shown in fig. 3.
It should be noted that the interface circuit, the bus transceiver circuit, and the bus switch circuit may also select other chips according to actual requirements, and the embodiments of the present disclosure are not limited specifically.
In some embodiments, in order to prevent the signal distribution equipment from overheating and causing failure during operation, a heat dissipation module may be disposed in the signal distribution equipment to cool the signal distribution equipment.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A signal distribution apparatus, comprising:
the audio input interface is used for inputting the collected audio signals;
the video input interface is used for inputting the collected video signals;
the keyboard input interface is used for inputting the collected keyboard signals;
the signal distribution unit is respectively electrically connected with the audio input interface, the video input interface and the keyboard input interface, and is used for synchronizing the keyboard signal with the audio signal and/or the video signal and distributing the synchronized audio signal, video signal and keyboard signal; the distributed audio signals comprise audio signals to be compressed, the distributed video signals comprise video signals to be compressed, and the distributed keyboard signals comprise keyboard signals to be transmitted;
the signal output interface is electrically connected with the signal distribution unit and is used for outputting the distributed audio signals, video signals and keyboard signals; the distributed audio signal, video signal and keyboard signal are output through the corresponding signal output interfaces;
the signal distribution apparatus further includes:
the signal compression unit is arranged between the signal distribution unit and the signal output interface;
the signal compression unit is used for carrying out compression coding on the audio signal to be compressed and the video signal to be compressed to obtain a compressed signal;
the signal output interface includes:
a compressed signal output interface for outputting the compressed signal;
and the serial input and output interface is used for outputting the keyboard signal to be transmitted.
2. The apparatus of claim 1, further comprising:
and the signal storage unit is electrically connected with the signal distribution unit and is used for storing the audio signal, the video signal and the keyboard signal as well as the distributed audio signal, the video signal and the keyboard signal.
3. The apparatus of claim 1, further comprising:
and the configuration unit is electrically connected with the signal distribution unit and is used for configuring and debugging the signal distribution unit.
4. The apparatus of claim 1, further comprising:
and the power supply module is electrically connected with the signal distribution unit and used for supplying power to the signal distribution equipment.
5. The apparatus of claim 1, wherein the signal distribution unit is an FPGA chip; the signal compression unit includes at least one of a Hi3519AV100 chip, a Hi3519V101 chip, and an h.265 high definition video encoder.
6. The device of claim 1, wherein the video input interface comprises at least one of an RGBHV interface, a VGA interface, and a DVI interface;
the keyboard input interface comprises at least one of a USB interface, a PS2 interface and a serial interface.
7. The device of claim 2, wherein the signal storage unit comprises at least one of SDRAM, DDR, and Flash.
8. The apparatus of claim 3, wherein the configuration unit is a JTAG loading circuit, the JTAG loading circuit including an interface circuit, a bus transceiver circuit, and a bus switch circuit electrically connected in sequence; the interface circuit is a 302-2S chip, the bus transceiver circuit is an SN74LVC245A chip, and the bus switch circuit is an NC7SZ66 chip.
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| CN210327796U (en) * | 2019-04-11 | 2020-04-14 | 云南天罡北斗信息科技有限公司 | Video analysis monitoring device based on multi-mode recognition |
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