CN213676590U - Novel car headrest navigation amusement multimedia system unification board - Google Patents

Abstract

The embodiment of the utility model discloses novel car headrest navigation amusement multimedia system unified board, which comprises a circuit board, the integration has master control T3L chip on the circuit board, DDR, the eMMC memory, PMU power manager, the GPS circuit, the wiFi circuit, the BT circuit, the FM transmitting circuit, MCU, TFT touch display screen, 12V changes 5V circuit, audio processing circuit, power amplifier circuit, AHD video processing circuit, 12V changes 5V circuit and PMU power manager electricity and is connected, master control T3L chip and MCU, PMU power manager, TFT touch display screen, DDR, the eMMC memory, the GPS circuit, the wiFi circuit, the BT circuit, the FM transmitting circuit, audio processing circuit, AHD video processing circuit electricity is connected, MCU is connected with PMU power manager electricity, audio processing circuit and power amplifier circuit electricity are connected. The utility model discloses a function is accomplished stability more, succinct, has also made things convenient for the secondary development and extensive the popularization of product simultaneously.

Description

Novel car headrest navigation amusement multimedia system unification board

Technical Field

The utility model relates to a car navigation multimedia technology field especially relates to a novel car headrest navigation amusement multimedia system unification board.

Background

With the development of electronic technology, a vehicle-mounted navigation entertainment multimedia system has taken a new era, and has developed from the original radio, tape player and CD player to the current DVD, MP3, MP5, Bluetooth, GPS, WiFi, 3G/4G and the like, and the system has stronger and stronger integration degree and more functional types no matter being high-end products or middle-end and low-end products; at present, in order to improve the comfort of passengers, more and more car owners can choose to add headrest screens to increase entertainment facilities of passengers on the back row, and the existing headrest products on the market have single functions, and each type of headrest product needs to be developed and designed independently, so that the development cycle and the cost of enterprises are undoubtedly increased for production type factories.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a technical problem that will solve provides a novel car headrest navigation amusement multimedia system unification body board to make secondary development and extensive popularization.

In order to solve the technical problem, the embodiment of the utility model provides a novel car headrest navigation amusement multimedia system unified board is proposed, which comprises a circuit board, the integration has master control T3L chip on the circuit board, DDR, the eMMC memory, PMU power manager, the GPS circuit, the wiFi circuit, the BT circuit, the FM transmitting circuit, MCU, TFT touch display screen, 12V changes 5V circuit, audio processing circuit, power amplifier circuit, AHD video processing circuit, 12V changes 5V circuit and PMU power manager electricity and is connected, master control T3L chip and MCU, PMU power manager, TFT touch display screen, DDR, the eMMC memory, the GPS circuit, the WiFi circuit, the BT circuit, the FM transmitting circuit, audio processing circuit, AHD video processing circuit electricity is connected, MCU and PMU power manager electricity are connected, audio processing circuit and circuit electricity are connected.

Further, a backlight circuit is integrated on the circuit board, and the backlight circuit is connected with the PMU power manager and the main control T3L chip.

Further, the MCU adopts an STM32 model single chip microcomputer.

The utility model has the advantages that: the utility model provides a convenient, simple and stable vehicle headrest navigation entertainment multimedia system unified body plate scheme for users, and saves the development cost of users; compared with a traditional headrest system, the headrest system is added with an FM transmitting function, a GPS positioning function, a WIFI networking function, a Bluetooth communication function and a backing display function, so that passengers in the back row can experience more practical functions of high-tech products; adopt the integrated board mode of highly integrating, the utility model discloses all required functional modules have been integrated for some key function accomplish more stable, succinct, also made things convenient for the secondary development and the extensive popularization of product simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of a novel car headrest navigation entertainment multimedia system body board according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a GPS circuit according to an embodiment of the present invention.

Fig. 3 is a circuit diagram of a WiFi circuit of an embodiment of the present invention.

Fig. 4 is a circuit diagram of a BT circuit according to an embodiment of the present invention.

Fig. 5 is a circuit diagram of an FM transmission circuit according to an embodiment of the present invention.

Fig. 6 is a circuit diagram of an AHD video processing circuit according to an embodiment of the present invention.

Fig. 7 is a circuit diagram of a sound effect processing circuit according to an embodiment of the present invention.

Fig. 8 is a circuit diagram of a power amplifier circuit according to an embodiment of the present invention.

Fig. 9 is a circuit diagram of a backlight circuit according to an embodiment of the present invention.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1 to 9, the novel car headrest navigation entertainment multimedia system unified board of the embodiment of the present invention includes a circuit board, on which a main control T3L chip, a DDR, an eMMC memory, a PMU power manager, a GPS circuit, a WiFi circuit, a BT circuit, an FM transmitting circuit, an MCU, a TFT touch display screen, a 12V to 5V circuit, a sound processing circuit, a power amplifier circuit, and an AHD video processing circuit are integrated.

The 12V to 5V circuit is electrically connected with the PMU power manager. The 12V to 5V circuit converts the 12V power input into the 5V power required by each circuit. The PMU power manager outputs various voltages required by each circuit chip: 3V3, 3V0, 2V8, 2V5, 1V5, 1V2, 1V 1.

The TFT touch display screen consists of a capacitive touch screen and a TFT display screen. The main control T3L chip is electrically connected with MCU, PMU power manager, TFT touch display screen, DDR, eMMC memory, GPS circuit, WiFi circuit, BT circuit, FM transmitting circuit, sound effect processing circuit, AHD video processing circuit, and MCU is electrically connected with PMU power manager. The T3L main control chip adopts a four-core ARM Cortex-A7 architecture CPU with a master frequency of 1.6GHz, a built-in MaiI-400MP2 GPU and supports the OpenGL ES 2.0/OpenVG 1.1 standard; the display supports LVDS interfaces, the highest resolution of 1920 x 1080P is supported, and 3 sets of USB, 8 sets of UART, 4 sets of SPI and 4 sets of AV-IN interfaces can be arranged externally. The utility model discloses a RAM memory bootstrap program is done to DDR4, and all work are accomplished by the DDR, including system operation, application's operation space etc.. The eMMC memory is used to store state information such as operating systems and applications.

The GPS circuit adopts a UART port to communicate with a main control T3L chip CPU, and can be compatible with a GPS and Beidou positioning chip; during navigation, the GPS circuit receives satellite signals and processes the satellite signals into longitude and latitude information, the main control T3L chip compares the longitude and latitude information transmitted by the GPS circuit with a map program running in an RAM, the current actual position of the equipment is determined after comparison, and finally, video information is transmitted to the TFT touch display screen for display after being processed; and the audio information is transmitted to the power amplification circuit to make sound after being processed.

The WiFi circuit is integrated with 2.4GWLANSoC, supports the 802.11b/g/n standard, and communicates with a main control T3L chip through an SDIO port; the WIFI hotspot sent by the connected mobile phone can realize the internet surfing function, and the user can conveniently use the language identification and update the real-time road condition information of the navigation map.

The BT circuit is compatible with Bluetooth 2.1+ EDR specification, and adopts a UART port to communicate with a main control T3L chip; the system can directly dial in a system interface of a TFT touch display screen after a mobile phone of a user is connected with the Bluetooth, or search contacts in the Bluetooth phone book to dial a call, and simultaneously support direct dialing at a mobile phone end, and after receiving a dialing instruction, the system calls a corresponding program to realize Bluetooth dialing, simultaneously transmits an audio signal to a main control T3L chip through a BT circuit to be processed, and amplifies the processed audio signal through a sound effect processing circuit and a power amplification circuit so as to push a loudspeaker to realize sound restoration.

The FM transmitting circuit adopts a single-chip stereo FM transmitter, supports 76MHz-108MHz full-band tuning, and has the advantages of automatic PA output power calibration, low power consumption and the like; the FM transmitting function can transmit the audio signal of the whole headrest screen through FM stereo signals, and the sound of the headrest screen equipment can be synchronized by taking the central control navigation, radio or other radio equipment in the automobile as a receiving object.

The AHD video processing circuit adopts a high-definition analog video decoding chip with a bidirectional data channel and supports HD-TVI720P input; when a user uses the reversing rearview function, the rearview camera outputs video signals to the AHD video processing circuit for processing, then the video signals are converted into BT656 signals to be transmitted to the main control T3L chip for processing, and after CPU video decoding processing, the video content of the rearview camera is transmitted to the TFT touch display screen through LVDS signals to be displayed.

The sound effect processing circuit adopts a sound processor chip special for the automobile sound; 3 single-path inputs, 2 input selectors of grounding isolation inputs, volume, a multi-section equalizer, loudness, 6CH volume control, LPF, an anti-aliasing filter and track volume control are arranged in the chip, and a high-grade switch circuit convenient for micro control is further arranged in the chip, so that the switching noises of the volume, silence, volume clipper, bass, middle-pitch, treble and loudness are reduced, and a high-quality automobile sound system is realized.

The power amplifier circuit is connected with the sound effect processing circuit, the power amplifier circuit adopts a novel D-type stereo audio power amplifier chip without coupling output and low-pass filter, the chip has a short-circuit protection function, and once the short circuit of output and output is detected, the chip is immediately and automatically closed, so that the chip is prevented from being damaged, and if the short circuit is eliminated, the device can be restarted; under 4 euro load and 5V power conditions, can provide 3W output directly drives loudspeaker, reduced the utility model discloses a cost and occupation in PCB space.

In one embodiment, a backlight circuit is further integrated on the circuit board, and the backlight circuit is connected with the PMU power manager and the main control T3L chip. The backlight circuit mainly comprises a booster circuit, a VGH & VGL generating circuit, a VCOM circuit, an LVDS display screen interface circuit and the like; the backlight circuit mainly outputs various voltages required by the TFT touch display screen: negative pressure 8V2 (VGL), positive pressure 18V (VGH), 10V (AVDD), 3V3-5V (CVOM).

As an implementation, the MCU is an STM32 type single chip microcomputer. The utility model discloses a MCU carries out various function operating instruction.

As an implementation mode, a power management circuit is further integrated on the circuit board, the power management circuit adopts a power management chip special for a vehicle-mounted audio, a group of 3V3 power supplies can be output to supply power to the MCU, a group of 12V power supplies required by the rearview camera for backing are output, and an ACC (adaptive cruise control), ILL (active line level) and REVERSE (REVERSE direction detection) loop is included.

After the integrated board of the utility model is powered on when 12V is input, 5V is output to the PMU power manager through a 12V to 5V circuit to output each power voltage required by each circuit on the integrated board; the MCU sends a starting instruction to chips of each circuit, the main control T3L chip reads a bootstrap program from the eMMC memory, reads an internal RAM of a CPU of the main control T3L chip to execute the bootstrap program, and the initialization configuration of the memory is completed in the process of executing the bootstrap program; after initialization is completed, the system in the eMMC memory is copied to the DDR, the operating system is operated in the DDR, initialization of other peripheral chips is completed in the system operating process, at this time, the external TFT touch display screen displays a starting picture, after the operating system is normally started, the TFT display screen of the TFT touch display screen normally enters an operation interface, at this time, the operation interface can be operated through the capacitive touch screen, and corresponding program icons can be clicked to operate corresponding functions.

After the operating system finishes normal startup, video analog signals are transmitted to an AHD video processing circuit, the video analog signals are converted into BT656 digital signals which are input to a CPU (central processing unit) of a main control T3L chip for data processing, and the video analog signals are transmitted to a TFT (thin film transistor) display screen through LVDS (low voltage differential signaling) signals for display after the CPU data and decoding; after the audio analog signals are transmitted to the main control T3L chip CPU for data processing, the analog signals are output to the sound effect processing circuit for sound effect processing, then the analog signals are transmitted to the power amplifier circuit for amplification, and finally the amplified audio signals are transmitted to the loudspeaker to realize sound restoration.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. The utility model provides a novel car headrest navigation amusement multimedia system uniform board, a serial communication port, which comprises a circuit board, the integration has main control T3L chip on the circuit board, DDR, the eMMC memory, PMU power manager, the GPS circuit, the wiFi circuit, the BT circuit, the FM transmitting circuit, MCU, TFT touch display screen, 12V changes 5V circuit, sound effect processing circuit, power amplifier circuit, AHD video processing circuit, 12V changes 5V circuit and is connected with PMU power manager electricity, main control T3L chip and MCU, PMU power manager, TFT touch display screen, DDR, the eMMC memory, the GPS circuit, the WiFi circuit, the PMU circuit, the FM transmitting circuit, sound effect processing circuit, AHD video processing circuit electricity is connected, MCU is connected with PMU power manager electricity, sound effect processing circuit and power amplifier circuit electricity are connected.

2. The new car headrest navigation entertainment multimedia system body plate as claimed in claim 1, wherein a backlight circuit is further integrated on the circuit board, and the backlight circuit is connected with the PMU power manager and the main control T3L chip.

3. The novel car headrest navigation entertainment multimedia system integrated board as claimed in claim 1, wherein the MCU is a STM32 type single chip microcomputer.

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