CN110738880A - portable audio and video training teaching auxiliary system and control method thereof - Google Patents
portable audio and video training teaching auxiliary system and control method thereof Download PDFInfo
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- CN110738880A CN110738880A CN201910973189.5A CN201910973189A CN110738880A CN 110738880 A CN110738880 A CN 110738880A CN 201910973189 A CN201910973189 A CN 201910973189A CN 110738880 A CN110738880 A CN 110738880A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/08—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations
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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
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
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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
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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Abstract
The invention discloses an portable audio and video practical training teaching auxiliary system and a control method thereof, which comprise a master-slave control module, an audio and video acquisition module, a battery charging and power management module, a WiFi communication module and the like.
Description
Technical Field
The invention relates to portable audio and video training teaching auxiliary systems and a control method thereof.
Background
In the traditional practical teaching, if audio and video teaching auxiliary equipment is not used, only a few students in the front row can hear and see the practical teaching and demonstration process of a teacher, and the students in the middle and rear rows can only see flowers in fog.
The existing audio and video system has the problems of large data transmission quantity, insufficient network bandwidth resources, mass storage of audio and video files, high cost, difficulty in popularization, inconvenience in carrying and operation and the like.
Disclosure of Invention
The invention aims to provide portable audio and video practical training teaching auxiliary systems and a control method thereof, which can realize high-definition live broadcast and recording in a teacher PC terminal and a plurality of student mobile terminal devices in the practical training teaching process.
The invention aims to realize the technical scheme that the portable audio and video practical training teaching auxiliary system comprises a master control module, a slave control module, an audio and video acquisition module, a WiFi communication module, a battery charging and power management module and a human-computer interface;
the main control module comprises a main controller and a peripheral circuit, the main controller respectively transmits control signals and audio and video original data with the audio and video acquisition module through an I2C interface and an MIPI interface, encodes the audio and video original data, then provides the audio and video streaming media data for the embedded multimedia card interface for local storage, and simultaneously forwards the audio and video streaming media data to the secure digital input and output card interface to send the data to the WiFi communication module;
the slave control module comprises a slave controller and a peripheral circuit and mainly realizes the functions of human-computer interface control and system working state switching;
the audio and video acquisition module comprises an audio pickup signal conditioning circuit, a camera and a driving module, and mainly realizes the acquisition and the preliminary processing of audio and video data and sends the audio and video data to the main control module;
the WiFi communication module comprises a communication module and an antenna and is responsible for converting audio and video streaming media data provided by the main control module into wireless signals and sending the wireless signals;
the battery charging and power management module comprises a lithium battery, an electric quantity metering chip and a power management unit, and is responsible for converting a direct current level provided by the USB interface and the lithium battery into levels required by each part of the system and is responsible for charging management of the lithium battery in the charging process;
the human-computer interface comprises a plurality of keys and indicator lamps, and a simple human-computer interaction function is realized.
The improvement is that a chip in the main controller is provided with a plurality of peripheral interfaces, the peripheral interfaces are a mobile industrial processor interface, an I2C interface, an SPI interface, a UART interface, an SDIO interface, a USB interface and an Ethernet interface, the mobile industrial processor interface is connected with a sensor module of the camera, two SDIO interfaces are respectively connected with the WiFi communication module and the embedded multimedia card interface, two I2C interfaces have two working levels, are 1.8V levels and are used for controlling the sensor module of the camera, and are 3.3V levels and are used for communicating with a battery charging and power management module.
The improvement of the invention is that the battery charging and power management module adopts a power management unit chip with the model number of ACT8946A, the power management unit is internally provided with a 3-path DC-DC buck chopper converter and a 4-path low-dropout linear voltage regulator, and a lithium battery charging management circuit.
The improvement of the invention is that the software part of the system is divided into upper computer software and lower computer software, the upper computer software comprises an application program at a PC end and an APP application program on mobile equipment, the main functions of the upper computer software are remote control of the working state of the system and online live broadcast, recording and playback of a teaching process, the lower computer software comprises a control program of a main controller and a control program of a slave controller, the working state of the system is set in different working states by the slave control module according to a startup/shutdown mode key and a corresponding instruction of the upper computer, and when the system is in an initial state, the system can be started only by a local key and can be remotely controlled by the upper computer instruction after network parameters are correctly configured because the network parameters of the system are not configured or power is lost.
the improvement of the invention is that the control method of the main control module comprises that after receiving the audio and video acquisition instruction sent by the slave controller, the main controller starts the audio and video device, completes the resource initialization of the memory and control register needed in the follow-up process, automatically adjusts the image exposure value according to the illumination intensity of the current shooting environment, then starts to receive the audio and video original signals collected by the pick-up head and the pick-up head according to the frame, carries out the optimization processing of echo cancellation, voice noise reduction, automatic gain, high-pass filtering and recording noise elimination on the audio original signals, carries out the optimization processing of de-noising, de-interlacing, zooming and sharpening on the video original signals, then encodes the audio and video according to the G711 and H264 protocols respectively, adds a time stamp in the head file, and facilitates the synchronization between the audio and the video in the follow-up playing process, and finally outputs the audio and video code stream to the local multimedia storage card and the network device for network.
The improvement of the invention is that the control method of the slave control module is that after the program starts, the device initialization operation is firstly carried out, when the connected wireless network is used or replaced for the first time, the initialization process utilizes the mobile device to establish point-to-point connection with the system WiFi communication module through scanning codes or inputting default hot roll names of the system WiFi communication module, then the current configuration parameters are configured or updated, the LED1 network indicator light flickers at 5Hz in the configuration process, after the configuration is successful, the LED1 network indicator light is normally on, the control function of the upper computer can be normally used, if the network parameters are not normally configured or no network exists, the LED1 network indicator light is not on, the control function of the upper computer is disabled, only the key of the local computer can be used for control, and the video can be only stored in the local multimedia storage card.
The invention has the beneficial effects that: the invention adopts a double-controller scheme, can control the switching of the working state in real time, and saves energy and electricity; the invention can be designed into portable or wearable equipment, thereby being convenient for deployment in practical training teaching; the invention can shoot in full high-definition, and the local storage time is not less than 8 hours; the invention adopts wireless communication, thereby meeting the requirements of high-definition live broadcast and network storage; the invention supplies power through the USB interface or the lithium battery, when the battery supplies power, the normal working endurance time is not less than 10 hours, and the standby time is not less than 72 hours; the invention adopts a reasonable power management scheme, reduces the power consumption of the system during normal work and standby, and prolongs the battery endurance time.
Description of the drawings:
FIG. 1 is a block diagram of the overall design of the present invention;
FIG. 2 is a circuit diagram of a main controller and an audio/video acquisition module;
FIG. 3 is a circuit diagram of the host controller and the WiFi communication module;
FIG. 4 is a circuit diagram of the master controller, the slave control module and the power module;
FIG. 5 is a circuit diagram of the slave control module connected to other modules;
FIG. 6 is a power distribution tree diagram;
FIG. 7 is a transition diagram of the operation state of the present invention;
FIG. 8 is a control flow diagram of the master control module;
FIG. 9 is a control flow diagram of the slave control module.
The specific implementation mode is as follows:
for purposes of making the objects, aspects and advantages of the embodiments of the present invention more apparent and fully described below, it is to be understood that the described embodiments are some, but not all, embodiments of . the elements and features described in embodiments of the present invention may be combined with those shown in or more other embodiments.
As shown in fig. 1, portable audio/video practical training teaching auxiliary systems comprise a master control module, a slave control module, an audio/video acquisition module, a WiFi communication module, a battery charging and power management module and a human-computer interface;
the main control module mainly comprises a main controller and a peripheral circuit, wherein the main controller respectively transmits control signals and audio and video original data with an audio and video module through an I2C interface and an MIPI interface, codes the audio and video original data according to system requirements, then provides audio and video streaming Media data for an EMMC (Embedded Multi Media Card) interface for local storage, and simultaneously forwards the audio and video streaming Media data to an SDIO interface to send the data to the WiFi communication module.
The slave control module comprises a slave controller and a peripheral circuit, and mainly realizes the functions of human-computer interface control and system working state switching.
The audio and video acquisition module mainly comprises an audio pickup signal conditioning circuit, a camera and a driving module. The part mainly realizes the acquisition and the preliminary processing of audio and video data and sends the audio and video data to the main control module.
The WiFi communication module comprises a communication module and an antenna and is responsible for converting audio and video streaming media data provided by the main control module into wireless signals and sending the wireless signals.
The battery charging and power management module mainly includes a lithium battery, a power metering chip CW2015 and a PMU (power management Unit) ACT 8946A. The module is responsible for converting the direct current level provided by the USB interface (5V) and the lithium battery into the level required by each part of the system, such as 3.3V, 1.8V and the like. And the lithium battery is responsible for charging management of the lithium battery in the charging process.
The man-machine interface mainly comprises a plurality of keys and indicator lamps, and realizes a simple man-machine interaction function.
The main controller is a high-definition network camera SOC (system on chip), the Processor kernel is ARM926, the working frequency is 540MHz, the chip has the H.264 and JPEG multi-code stream video coding processing capacity of 720P @30fps and the main stream audio coding and decoding capacity of G.711 and the like, the chip adopts a low-power consumption process and a framework, is matched with the energy-saving requirement when the battery is adopted for supplying power, and is provided with rich peripheral interfaces, such as interfaces of MIPI (Mobile Industry Processor Interface), I2C, SPI, UART, SDIO, USB, Ethernet and the like, so that the communication and data exchange with peripheral equipment are convenient, the MIPI interfaces are connected with a sensor module of the camera, the two SDIO interfaces are respectively connected with WiFi and EMMC, the two I2C interfaces have two working levels, the interfaces adopt 1.8V level and are used for realizing the control of the camera sensor module, and the other is 3.3V level and is used for communicating with a battery charging and power management module.
The camera converts original video data generated by sensor signals into low-voltage serial differential signals according to requirements, and then sends the low-voltage serial differential signals to the main controller through the MIPI interface, the main controller converts the received serial differential signals into a DC (digital Camera) time sequence and transmits the DC (digital Camera) time sequence to a lower -level module ViCAP (video Capture), because serial and differential signal communication is adopted in the transmission process, the requirements can be met in the aspects of wire connection number, speed and anti-interference, an audio and video acquisition module is connected with the main controller, as shown in figure 2, audio signals are connected into a left channel input pin P13 of an audio interface of the main controller after being connected with a 4.7 microfarad capacitor in series, a SDIO interface connected with a WiFi communication module comprises 1 clock wire, 1 data wire and 4 parallel data wires, the left side of the audio and video acquisition module is a connection pin connected with a slave control module, the left side of the audio and video acquisition module comprises serial communication interface connection wires, a power supply connection wire, a charging interface is connected with a charging interface, and a charging status indicator (battery) is connected with a charging status indicator) of a battery, and a charging status indicator (battery) for controlling the battery, wherein the battery is used for acquiring the current battery status information of a battery.
And the slave controller selects an ultra-low power consumption micro control unit STM8L151F 3. It has 5 low power consumption modes: wait, low power consumption operation, low power wait, active shutdown with RTC, shutdown. And the slave controller realizes the switching of the working state of the system according to the operation of the user. In the standby mode, the sleep mode and other power saving modes, the slave controller only reserves the power supply of part of circuits according to the energy saving control strategy of the system, so that the chip and the system are in a low power consumption state. In the sleep mode, only the slave controller and the WiFi communication module are in the standby state, so that the battery is in the longest endurance state. The slave controller adopts an internal clock, the 19 pins connected with the on/off/mode key and the 13 pins connected with the WiFi wake-up signal are in an interrupt state, the IO interface of the slave controller receives interrupt through long pressing of the key for 3s and the wake-up instruction of the upper computer, the PMU is controlled to output all power supplies, and the system enters a normal start-up working mode. The connection circuit of the slave control module and other modules is shown in fig. 5.
The power supply part of the invention is charged through an external USB interface when idle, and is supplied with power by a lithium battery when normal work, as shown in FIG. 6, a battery charging and power management module adopts a PMU chip with the model number ACT8946A, the PMU is internally provided with a 3-way DC-DC buck chopper converter and a 4-way LDO (Low-drop out) linear voltage regulator, and is internally provided with a lithium battery charging management circuit, when the external USB interface supplies power, a built-in switching tube S1 and S2 of the PMU in FIG. 6 is turned on, S3 is turned off, the system supplies power by USB power, and the lithium battery is charged by the USB power, when the USB power is removed, S1 and S2 are turned off, S3 is turned on and is automatically switched to the lithium battery power supply, the power domain of the whole system is divided into a normally powered power domain (in a dashed line frame in FIG. 6) and a system power domain, wherein the system power domain mainly supplies power to other modules except for WiFi and slave controllers, the normally powered by the normally powered power domain, only when the normally powered by the battery, the normally powered by the hardware, the normally powered battery charging and the PMU can accurately monitor the standby voltage of the battery by the Low voltage, the hardware can accurately monitor the battery charging voltage of the battery charging and the hardware, the hardware can accurately detect the battery by the hardware under the hardware that the battery charging and the hardware that the PMU, the hardware can accurately monitor the battery charging unit, the battery charging unit can accurately.
The software part of the invention is divided into upper computer software and lower computer software. The upper computer software comprises an application program of a PC (personal computer) end and an APP (application program) on the mobile equipment, and the main functions of the upper computer software are remote control of the working state of the system, online live broadcast, recording, playback and the like in the teaching process. The lower computer software includes a master controller control program and a slave controller control program, fig. 7 is a state switching diagram of the present invention, and the slave control module sets the system in different working states according to the on/off/mode key and the corresponding instruction of the upper computer in the working state of the present invention. In the initial state, because the network parameters of the system are not configured or lost due to power loss, the system can be started only by using a key of the local machine and can be remotely controlled by using an upper computer instruction after the network parameters are correctly configured.
As shown in fig. 8, the control method of the main control module is as follows: after receiving an audio and video acquisition instruction sent by the slave controller, the master controller firstly starts audio and video equipment and completes resource initialization of a memory and a control register required in the subsequent process; automatically adjusting an image exposure value according to the illumination intensity of the current shooting environment, then starting to receive audio and video original signals collected by a pickup head and a camera according to frames, carrying out optimization processing such as echo cancellation, voice noise reduction, automatic gain, high-pass filtering, recording noise elimination and the like on the audio original signals, and carrying out optimization processing such as denoising, de-interlacing, scaling, sharpening and the like on the video original signals; then, the audio and the video are respectively coded according to G711 and H264 protocols, and a time stamp is added in a header file, so that the synchronization between the audio and the video in the subsequent playing process is convenient; and finally, outputting the audio and video code stream to a local multimedia memory card for storage and network equipment for network live broadcast.
As shown in fig. 9, the control method of the slave control module is as follows: after a program is started, equipment initialization operation is firstly carried out, and when a connected wireless network is used or replaced for the first time, the initialization process is carried out by establishing point-to-point connection between mobile equipment and a system WiFi communication module through code scanning or inputting a default hot roll name of the system WiFi communication module and then configuring or updating current configuration parameters; the LED1 network indicator light will flash at 5Hz during configuration; after the configuration is successful, the LED1 network indicator lamp is normally on, and the control function of the upper computer can be normally used; if the network parameters are not configured normally or no network exists, the LED1 network indicator light is not on, the control function of the upper computer is invalid, the upper computer can only be controlled by using keys of the local computer, and the video can only be stored in a local multimedia storage card.
Finally, it should be noted that: although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, devices, means, methods, or steps.
Claims (6)
- The portable audio and video practical training teaching auxiliary systems are characterized by comprising a master control module, a slave control module, an audio and video acquisition module, a WiFi communication module, a battery charging and power management module and a human-computer interface;the main control module comprises a main controller and a peripheral circuit, the main controller respectively transmits control signals and audio and video original data with the audio and video acquisition module through an I2C interface and an MIPI interface, encodes the audio and video original data, then provides the audio and video streaming media data for the embedded multimedia card interface for local storage, and simultaneously forwards the audio and video streaming media data to the secure digital input and output card interface to send the data to the WiFi communication module;the slave control module comprises a slave controller and a peripheral circuit and mainly realizes the functions of human-computer interface control and system working state switching;the audio and video acquisition module comprises an audio pickup signal conditioning circuit, a camera and a driving module, and mainly realizes the acquisition and the preliminary processing of audio and video data and sends the audio and video data to the main control module;the WiFi communication module comprises a communication module and an antenna and is responsible for converting audio and video streaming media data provided by the main control module into wireless signals and sending the wireless signals;the battery charging and power management module comprises a lithium battery, an electric quantity metering chip and a power management unit, and is responsible for converting a direct current level provided by the USB interface and the lithium battery into levels required by each part of the system and is responsible for charging management of the lithium battery in the charging process;the human-computer interface comprises a plurality of keys and indicator lamps, and a simple human-computer interaction function is realized.
- 2. The portable audio and video practical training teaching auxiliary system is characterized in that a chip in the main controller is provided with a plurality of peripheral interfaces, the peripheral interfaces are a mobile industrial processor interface, an I2C interface, an SPI interface, a UART interface, an SDIO interface, a USB interface and an Ethernet interface, the mobile industrial processor interface is connected with a sensor module of a camera, two SDIO interfaces are respectively connected with the WiFi communication module and the embedded multimedia card interface, two I2C interfaces have two working levels, are 1.8V levels and are used for controlling the sensor module of the camera, and are 3.3V levels and are used for communicating with the battery charging and power management module.
- 3. The portable audio and video practical training teaching auxiliary system is characterized in that the battery charging and power management module adopts a power management unit chip with the model number of ACT8946A, the power management unit is internally provided with a 3-path DC-DC buck chopper converter and a 4-path low dropout linear regulator, and a lithium battery charging management circuit.
- 4. The kind of portable audio and video practical training teaching auxiliary system of claim 1, wherein the software part of the system is divided into upper computer software and lower computer software;the upper computer software comprises an application program of a PC (personal computer) end and an APP (application program) on the mobile equipment, and has the main functions of remote control of the working state of the system, online live broadcast, recording and playback of the teaching process;the lower computer software comprises a main controller control program and a slave controller control program, the working state of the system is set in different working states by the slave control module according to the startup/shutdown mode key and the corresponding instruction of the upper computer, and in the initial state, because the network parameters of the system are not configured or lost due to power failure, the system can be started only by using the keys of the lower computer and can be remotely controlled by using the instruction of the upper computer after the network parameters are correctly configured.
- 5. The portable audio and video practical training teaching auxiliary system is characterized in that a control method of a main control module comprises the steps of starting audio and video equipment after a main controller receives an audio and video acquisition instruction sent by a slave controller, completing resource initialization of a memory and a control register required in a subsequent process, automatically adjusting an image exposure value according to the illumination intensity of a current shooting environment, then starting to receive audio and video original signals acquired by a pickup head and a camera according to frames, carrying out optimization processing of echo cancellation, voice noise reduction, automatic gain, high-pass filtering and recording noise elimination on the audio original signals, carrying out optimization processing of denoising, de-interlacing, zooming and sharpening on the video original signals, then coding the audio and video according to G711 and H264 protocols respectively, adding a timestamp in a head file to facilitate synchronization between the audio and the video in a subsequent playing process, and finally outputting audio and video code streams to a local multimedia storage card and a network device for live broadcast.
- 6. The portable audio and video practical training teaching auxiliary system is characterized in that a slave control module is controlled by firstly carrying out equipment initialization operation after a program is started, configuring or updating current configuration parameters after point-to-point connection is established between the mobile equipment and a system WiFi communication module through code scanning or inputting a default hot roll name of the system WiFi communication module in the initialization process when a connected wireless network is used or replaced for the first time, an LED1 network indicator lamp flickers at 5Hz in the configuration process, the LED1 network indicator lamp is normally on after the configuration is successful, the control function of an upper computer can be normally used, the LED1 network indicator lamp is not on if network parameters are not normally configured or the network does not exist, the control function of the upper computer is disabled and can only be controlled by using a key of the upper computer, and videos can only be stored in a local multimedia storage card.
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Application publication date: 20200131 |