CN219420776U

CN219420776U - Broadcasting adapter

Info

Publication number: CN219420776U
Application number: CN202320974090.9U
Authority: CN
Inventors: 关宇晟; 容家宇; 陈凯; 刘明矗
Original assignee: Guangxi Radio And Television Big Data Technology Co ltd
Current assignee: Guangxi Radio And Television Big Data Technology Co ltd
Priority date: 2023-04-26
Filing date: 2023-04-26
Publication date: 2023-07-25
Anticipated expiration: 2033-04-26

Abstract

The utility model discloses a broadcast adapter, which comprises a main control chip, a wireless network module, a wired network module, a DTMB collector, a sound card, an FM receiving module, an audio signal processing module, a fixed-resistance loudspeaker and a power module, wherein the main control chip is connected with the wireless network module; the wireless network module is in communication connection with the main control chip and is used for constructing wireless network connection between the main control chip and the cloud platform; the wired network module is in communication connection with the main control chip and is used for constructing wired network connection between the main control chip and the cloud platform; the output end of the DTMB collector is in communication connection with the input end of the main control chip. The utility model can be connected to an emergency broadcasting platform through a wired or wireless network, has the capability of receiving IP network, FM and DTMB ground digital television emergency broadcasting, can respond in time and broadcast emergency broadcasting audio, and can push local audio files to a cloud platform through the network, thereby controlling terminal nodes subordinate to the adapter and realizing the function of broadcasting by a host machine and multi-node response broadcasting.

Description

Broadcasting adapter

Technical Field

The utility model belongs to the technical field of emergency broadcasting, and particularly relates to a broadcasting adapter.

Background

With the development of society and economy, various contradictions are remarkable, and social security events, accident disasters and public health events occur at time, so that in order to reduce the losses caused by accidents, crisis and disasters to the greatest extent, an emergency broadcast system is established, disaster early warning information can be timely and effectively issued, and corresponding policy information is issued, so that the losses caused by accidents and disasters are reduced.

In addition, the broadcasting system is used as a transmission channel for public culture information transmission, can meet the demands of people on listening to news, music, entertainment and other programs in a production and living process and after tea and other meals, and can regulate moods and pottery and metallurgy feelings.

However, the conventional broadcasting system has the following problems:

the traditional broadcasting system mainly uses analog frequency modulation and digital broadcasting technology, and only one channel for transmitting audio is usually arranged between a broadcasting platform and terminals in towns (villages) and villages, for example, the audio is transmitted through an IP channel, a corresponding disaster recovery information transmission channel is lacked, and when the channel is occupied, emergency broadcasting audio cannot be responded and broadcast in time. In addition, the traditional broadcasting equipment terminal does not have a networking function, has the problems of incapability of uniform broadcasting and uniform management, can not realize accurate broadcasting of contents, and can not timely transmit daily information, natural disaster information and the like.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a broadcasting adapter which can be connected to an emergency broadcasting platform through a wired or wireless network, has the capability of receiving IP network, FM and DTMB ground digital television emergency broadcasting, can respond in time and broadcast emergency broadcasting audio, and can push local audio files to a cloud platform through the network, thereby controlling terminal nodes subordinate to the adapter and realizing the function of broadcasting by a host in response broadcasting of multiple nodes.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a broadcasting adapter comprises a main control chip, a wireless network module, a wired network module, a DTMB collector, a sound card, an FM receiving module, an audio signal processing module, a resistance-fixed loudspeaker and a power module; the wireless network module is in communication connection with the main control chip and is used for constructing wireless network connection between the main control chip and the cloud platform; the wired network module is in communication connection with the main control chip and is used for constructing wired network connection between the main control chip and the cloud platform; the output end of the DTMB collector is in communication connection with the input end of the main control chip and is used for collecting DTMB broadcast audio to the main control chip; the input end of the sound card is in communication connection with the output end of the main control chip and is used for converting digital audio signals in the main control chip into analog audio signals and outputting the analog audio signals; the input end of the FM receiving module is in communication connection with the output end of the main control chip, and the output end of the FM receiving module is in communication connection with the input end of the sound card and is used for receiving FM audio and outputting the FM audio to the sound card; the input end of the audio signal processing module is in communication connection with the output end of the sound card and is used for selecting and amplifying the audio signals; the input ends of the at least two resistance-fixed loudspeakers are in communication connection with the output end of the audio signal processing module and are used for playing the audio processed by the audio signal processing module; the power module is used for providing working voltage.

Further, the wireless network module comprises a 4G module, the 4G module adopts an EC200U-CN chip, a USB Hub chip is arranged between the 4G module and the main control chip, and the 4G module is in communication connection with the main control chip through a USB bus.

Still further, the broadcast adapter further comprises an external audio selection input module; the external audio selection input module comprises a first audio input selector, a telephone input interface, a pickup and a line input interface; the output end of the telephone input interface is in communication connection with the input end of the first audio input selector, and a first audio amplifying circuit is arranged between the input end of the telephone input interface and the output end of the 4G module; the output end of the pickup is in communication connection with the input end of the first audio input selector; the circuit input interfaces are provided with a plurality of output ends which are all in communication connection with the input end of the first audio input selector; an output of the first audio input selector is communicatively coupled to an input of the sound card.

Further, the cable network module comprises a PHY chip and an RJ45 network port transformer, wherein the output end and the input end of the PHY chip are respectively in communication connection with the input end of the main control chip and the output end of the RJ45 network port transformer, and the input end of the RJ45 network port transformer is used for being connected with an RJ45 network port.

Further, the DTMB collector comprises a TUNER chip and a DTMB demodulator; the output end of the TUNER chip is in communication connection with the input end of the DTMB demodulator, and the F head antenna is connected to the outside of the TUNER chip; a TS-to-USB conversion module is arranged between the output end of the DTMB demodulator and the input end of the main control chip; the output end of the DTMB demodulator is in communication connection with the input end of the TS-to-USB conversion module, a USB Hub chip is arranged between the output end of the TS-to-USB conversion module and the input end of the main control chip, and the TS-to-USB conversion module is in communication connection with the main control chip through a USB bus.

Further, the FM receiving module comprises two FM chips, and the input ends of the two FM chips are all in communication connection with the output end of the main control chip through an I2C bus; a second audio input selector is arranged between the output ends of the two FM frequency modulation chips and the input end of the sound card.

Further, the audio signal processing module comprises an audio output selector and a TPA3116 main power amplifier chip; the input end of the audio output selector is respectively in communication connection with the output end of the sound card, and the output end is in communication connection with the input end of the TPA3116 main power amplifier chip; the output end of the TPA3116 main power amplifier chip is in communication connection with the input end of the fixed-resistance loudspeaker.

Still further, the broadcast adapter further comprises a microphone input module, the microphone input module comprising a microphone interface, a microphone and a second audio amplifying circuit; the output ends of the microphone interface and the microphone are both in communication connection with the input end of the second audio amplifying circuit, and the output end of the second audio amplifying circuit is respectively in communication connection with the input end of the sound card and the input end of the audio output selector.

Further, the power supply module comprises a power supply filter, a power supply switch, a first DCDC power supply circuit, a second DCDC power supply circuit, a third DCDC power supply circuit, a first LDO power supply circuit, a second LDO power supply circuit, a third LDO power supply circuit and a lithium battery charging chip; the power filter is connected between the power switch and the mains supply, and the power switch can output 24V direct current voltage; the output end of the power switch is electrically connected with the first DCDC power supply circuit, the second DCDC power supply circuit, the third DCDC power supply circuit, the first LDO power supply circuit and the input end of the lithium battery rechargeable battery respectively; the output end of the first DCDC power supply circuit is electrically connected with the input end of the second LDO power supply circuit, and the output end of the second LDO power supply circuit is electrically connected with the input end of the third LDO power supply circuit.

Still further, the broadcasting adapter further comprises a USB flash disk input interface, a serial port-to-RS 232 module, a TF card slot interface, a singlechip, keys, an LED module, an ADC module, a cannon head, a single-ended-to-balanced output circuit, an RCA line output interface, an RGB-to-HDMI module, an HDMI interface and a small power amplifier chip; a USB Hub chip is arranged between the USB flash disk input interface and the main control chip, and the USB flash disk input interface is in communication connection with the main control chip through a USB data bus; the output ends of the serial port-to-RS 232 module and the TF card slot interface are both in communication connection with the input end of the main control chip; the key and the LED module are respectively connected with the input end of the singlechip, and the output end of the singlechip is in communication connection with the input end of the main control chip; the ADC module is in communication connection with the main control chip; the input end of the single-ended-to-balanced output module is in communication connection with the output end of the sound card, and the output end of the single-ended-to-balanced output module is in communication connection with the input end of the Cannon head; the input end of the RCA line output interface is in communication connection with the output end of the sound card; the output end of the RGB-to-HDMI module is in communication connection with the input end of the main control chip, and the output end of the HDMI interface is in communication connection with the input end of the RGB-to-HDMI module; the input end of the small power amplifier chip is in communication connection with the output end of the sound card, and the output end of the small power amplifier chip is connected with a loudspeaker.

The broadcast adapter provided by the utility model has the following beneficial effects:

1. the system can realize the functions of broadcasting emergency broadcasting in various channels such as IP network, frequency modulation broadcasting, DTMB broadcasting, local broadcasting and the like, is connected to an emergency broadcasting platform through a wired or wireless network, can push local audio files to a cloud platform through a wireless or wired network, thereby controlling terminal nodes subordinate to an adapter, realizing the function of broadcasting by a host in response to broadcasting by multiple nodes, for example, through network connection, can uniformly broadcasting and managing an IP transceiver and an IP sound column bound under the broadcasting adapter, realize accurate broadcasting of content, timely transfer daily information, natural disaster information and the like.

2. The system is provided with the FM receiving module, and can receive emergency broadcast sent by the FM transmitting radio station when network connection is not smooth, so that broadcasting coverage of broadcast audio is improved.

3. The broadcasting adapter can be used as a terminal, can drive four resistance-fixed horns with the specification of '16 omega 25W', has the highest output power of 100W and has wide broadcasting coverage range.

Drawings

Fig. 1 is a block diagram of a main body of an embodiment of the present utility model.

Fig. 2 is a block diagram of the connections between the motherboard, the power control board, the front panel, and the LCD control board of an embodiment of the present utility model.

Fig. 3 is a block diagram of connection between each module and a main control chip according to an embodiment of the present utility model.

Fig. 4 is a block diagram of a power module according to an embodiment of the present utility model.

Fig. 5 is a circuit diagram of a main control chip according to an embodiment of the utility model.

Fig. 6 is a circuit diagram of a first audio input selector, a second audio input selector, and an audio output selector according to an embodiment of the present utility model.

Fig. 7 is a circuit diagram of a sound card of an embodiment of the present utility model.

Fig. 8 is a circuit diagram of a PHY chip of an embodiment of the utility model.

FIG. 9 is a circuit diagram of a USB Hub chip according to an embodiment of the utility model.

Fig. 10 is a first or second audio amplifying circuit diagram of an embodiment of the present utility model.

Fig. 11 is a circuit diagram of an FM reception module according to an embodiment of the utility model.

Fig. 12 is a first DCDC power supply circuit diagram of an embodiment of the present utility model.

Fig. 13 is a second DCDC power supply circuit diagram of an embodiment of the present utility model.

Fig. 14 is a third DCDC power supply circuit diagram of an embodiment of the present utility model.

Fig. 15 is a first LDO power supply circuit diagram of an embodiment of the utility model.

Fig. 16 is a second LDO power supply circuit diagram of an embodiment of the utility model.

Fig. 17 is a third LDO power supply circuit diagram of an embodiment of the utility model.

Fig. 18 is a circuit diagram of a lithium battery charging chip according to an embodiment of the present utility model.

Fig. 19 is a circuit diagram of a TF card slot interface according to an embodiment of the present utility model.

Detailed Description

The present utility model is described below with reference to the accompanying drawings, and the specific embodiments described herein are for illustrating and explaining the present utility model, not for limiting the present utility model, and various modifications and improvements made by those skilled in the art to which the present utility model pertains without departing from the spirit of the design of the present utility model, should fall within the scope of the present utility model.

As shown in fig. 1 to 19, the broadcast adapter of the present embodiment includes a main control chip, a wireless network module, a wired network module, a DTMB collector, a sound card, an FM receiving module, an audio signal processing module, a resistive loudspeaker, and a power module.

The main control chip adopts an industrial grade core board with an embedded Linux system, is based on a low-power-consumption high-performance low-cost application processor of an ARM Cortex A7 core, and is an IMXU6LL type core board in a circuit.

The wireless network module is in communication connection with the main control chip and is used for constructing wireless network connection between the main control chip and the cloud platform. Specifically, the wireless network module comprises a 4G module, the model of the 4G module is an EC200U-CN chip or module, a USB Hub chip is arranged between the 4G module and the main control chip, and the 4G module is in communication connection with the main control chip through a USB bus. The 4G network can stably pull the audio stream in the cloud server, and the audio stream is transmitted to the main control chip through the USB, so that the function of remotely playing the specific audio is realized. The 4G module has a telephone dialing function, and can remotely realize a voice broadcasting function by dialing a telephone through a mobile phone. The 4G module has a short message receiving function, and can convert a short message text into voice broadcasting through a TTS function built in the 4G module.

The wired network module is in communication connection with the main control chip and is used for constructing wired network connection between the main control chip and the cloud platform. Specifically, the cable network module comprises a PHY chip and an RJ45 network port transformer, wherein the output end and the input end of the PHY chip are respectively in communication connection with the input end of the main control chip and the output end of the RJ45 network port transformer, and the input end of the RJ45 network port transformer is used for being connected with an RJ45 network port. In the present embodiment, the PHY chip is a LAN8720A chip.

The output end of the DTMB collector is in communication connection with the input end of the main control chip and is used for collecting DTMB broadcast audio to the main control chip. In particular, in this embodiment, the DTMB collector includes a TUNER chip and a DTMB demodulator. The output end of the TUNER chip is in communication connection with the input end of the DTMB demodulator, a TS-to-USB conversion module is arranged between the output end of the DTMB demodulator and the input end of the main control chip, the output end of the DTMB demodulator is in communication connection with the input end of the TS-to-USB conversion module, and a USB Hub chip is arranged between the output end of the TS-to-USB conversion module and the input end of the main control chip. The TUNER chip is used for receiving the DTMB signal, outputting the DTMB signal obtained through analog demodulation to the demodulator, converting the DTMB signal into TS stream by the demodulator, outputting the TS stream, and setting the USB Hub chip to enable the TS stream USB conversion module to transmit the TS stream to the main control chip through the USB data bus.

In addition, the TUNER chip and the main control chip are communicated through the I2C bus, so that the main control chip carries out basic configuration on the TUNER chip, the TUNER chip is switched to a DTMB channel which needs to be received, and an F head antenna is connected to the outside of the TUNER chip. The main control chip communicates with the demodulator through the I2C bus.

The input end of the sound card is in communication connection with the output end of the main control chip and is used for converting digital audio signals in the main control chip into analog audio signals and outputting the analog audio signals. In this embodiment, the sound card is a cloud WM8904CGEFL chip, and the main control chip and the sound card perform digital audio signal transmission communication through an I2S bus, and convert the digital audio signal into an analog audio signal and output the analog audio signal. In addition, control signals are transmitted between the main control chip and the sound card through an I2C bus.

The input end of the FM receiving module is in communication connection with the output end of the main control chip, and the output end of the FM receiving module is in communication connection with the input end of the sound card and is used for receiving FM audio and outputting the FM audio to the sound card. Specifically, the FM receiving module comprises two FM chips, and the input ends of the two FM chips are connected with the output end of the main control chip through I2C bus communication; a second audio input selector is arranged between the output ends of the two FM frequency modulation chips and the input end of the sound card. The model of the two FM chips is RDA5807 type chip, two FM audio frequencies can be received simultaneously, the main control chip is in communication connection with the two FM chips through the I2C bus, further, the audio output, the audio size, the audio frequency channel and the like received by the FM chips are controlled, under the control of the main control chip, the two FM chips output the received FM audio frequencies to the second audio input selector, the model of the second audio input selector is CD4052 type chip, the chip is represented by U22 in a circuit, and the second audio input selector selects one channel of received FM audio to output to the sound card.

The input end of the audio signal processing module is in communication connection with the output end of the sound card and is used for selecting and amplifying the audio signals. Specifically, the audio signal processing module comprises an audio output selector and a TPA3116 type main power amplifier chip. The input end of the audio output selector is respectively in communication connection with the output end of the sound card, and the output end of the audio output selector is in communication connection with the input end of the TPA3116 main power amplifier chip. The output end of the TPA3116 main power amplifier chip is in communication connection with the input end of the fixed-resistance loudspeaker.

The broadcast adapter also includes a microphone input module including a microphone interface, a microphone, and a second audio amplification circuit. The output ends of the microphone interface and the microphone are both in communication connection with the input end of a second audio amplifying circuit, the second audio amplifying circuit adopts a JRC4558D chip, the output end of the second audio amplifying circuit is respectively in communication connection with the input end of the sound card and the input end of an audio output selector, and the audio output selector adopts an RS2117YN chip. The microphone interface is a 6.35mm microphone interface, the microphone interface and the microphone are both used for being connected with a microphone, and analog audio signals input by the microphone are amplified by the second audio amplifying circuit and then are respectively input into the sound card and the audio output selector. The audio output selector selects the audio input by the sound card or the microphone input module as the audio output of the broadcasting adapter, and the audio is output to the TPA3116 type main power amplifier chip.

The specification of four resistance-fixed horns is '16Ω 25W', and four resistance-fixed horns 'input all is with audio signal processing module's output communication connection for play audio signal processing module post-treatment, in this embodiment, TPA3116 type main power amplifier chip is provided with two, and two resistance-fixed horns are connected to a TPA3116 type main power amplifier chip, and four resistance-fixed horns are used for playing audio signal after-amplifying by TPA3116 type main power amplifier chip, and four resistance-fixed horns exportable maximum power is 100W.

The broadcast adapter also includes an external audio selection input module. The external audio selection input module includes a first audio input selector, a telephone input interface, a microphone, and a line input interface. The output end of the telephone input interface is in communication connection with the input end of the first audio input selector, a first audio amplifying circuit is arranged between the input end of the telephone input interface and the output end of the 4G module, and the first audio amplifying circuit is the same as the second audio amplifying circuit and adopts JRC4558D chips. The output of the pickup is communicatively coupled to the input of the first audio input selector. The line input interfaces are provided with a plurality of output ends which are all in communication connection with the input end of the first audio input selector. An output of the first audio input selector is communicatively coupled to an input of the sound card. In this embodiment, a telephone input interface, or called a telephone/information audio input interface, is used to implement the audio output function of the 4G module. The function of the pickup is to collect sounds off-site of the installation of the broadcast adapter. The two-path RCA interface adopted by the line input interface is used as the line input port of the broadcasting adapter, and can receive the line output audio of other audio equipment. The first audio input selector adopts a CD4052 type chip, and in a circuit, the chip is denoted by U23, and the first audio input selector is used for selecting an audio input of a line, a pickup and a telephone/short message, and selects one of the audio inputs to enter an audio input port of the sound card.

The broadcasting adapter further comprises a U disk input interface, a serial port-to-RS 232 module, a serial port-to-USB module, a TF card slot interface, a singlechip, keys, an LED module, an ADC module, a cannon head, a single-ended-to-balanced output circuit, an RCA line output interface, an RGB-to-HDMI module, an HDMI interface and a small power amplifier chip.

The USB Hub chip is arranged between the USB flash disk input interface and the main control chip, and the USB flash disk input interface is in communication connection with the main control chip through a USB data bus. The USB flash disk input interface is provided with two, and the USB flash disk input interface is used for inserting the USB flash disk, and the audio in the USB flash disk can be transmitted to the main control chip through the USB data bus, and in this embodiment, two USB flash disk input interfaces, the DTMB collector and the 4G module share a USB Hub chip.

The output ends of the serial port-to-RS 232 module, the serial port-to-USB module and the TF card slot interface are all in communication connection with the input end of the main control chip. The serial port-to-RS 232 module adopts an SP3232EEY type chip, and the input end of the serial port-to-RS 232 module is provided with a DB9 interface for connecting with external equipment so as to check the running state and fault information of the broadcasting adapter. The serial port-to-USB module adopts a CH340C TYPE chip, and the input end of the serial port-to-USB module is provided with a TYPE-C interface for connecting a notebook computer, so that the broadcasting adapter is convenient to debug. The TF card slot is used for inserting a TF card, the TF card is connected with the SDIO interface of the main control chip, the storage function expansion of the broadcasting adapter can be realized, and the operation log of the equipment is stored.

The key and the LED module are respectively connected with the input end of the singlechip, and the output end of the singlechip is in communication connection with the input end of the main control chip. The model of the singlechip is STM32G030C8T6 type singlechip, the singlechip is in communication connection with the main control chip through a serial port, and the singlechip is used for receiving a control instruction of the main control chip so as to control the operation of the LED module, and the singlechip transmits a signal to the main control chip through the serial port after detecting the action of a key. In addition, the singlechip is also connected with an LCD display module, and after receiving a control instruction of the main control chip, the singlechip controls the LCD display module and displays corresponding information through the LCD display module.

The ADC module is in communication connection with an ADC interface of the main control chip. The ADC module is connected with the power module and the volume adjusting knob, and is used for detecting the voltage of the power module, entering the ADC interface of the main control chip after voltage division, and reading the corresponding voltage value. When the volume adjusting knob is rotated, the volume amplification factor is adjusted by reading the change of the resistance value of the rheostat.

The input end of the single-ended-to-balanced output module is in communication connection with the output end of the sound card, and the output end of the single-ended-to-balanced output module is in communication connection with the input end of the Cannon head. The single-ended-to-balanced output module adopts an NE5532 chip and is used for converting an audio single end into balanced output and outputting a balanced output signal to a cannon head.

The input end of the RCA line output interface is in communication connection with the output end of the sound card and is used for outputting the audio in the sound card.

The output end of the RGB-to-HDMI module is in communication connection with the input end of the main control chip, and the output end of the HDMI interface is in communication connection with the input end of the RGB-to-HDMI module. In this embodiment, the RGB-to-HDMI module adopts a SII9022 chip, and the RGB signal output by the main control chip is converted into an HDMI signal by the RGB-to-HDMI module, and the HDMI interface can be externally connected to a display screen to display the working state of the broadcasting adapter.

The input end of the small power amplifier chip is in communication connection with the output end of the sound card, and the output end of the small power amplifier chip is connected with a loudspeaker. In this embodiment, the model of the small power amplifier chip is NS4110B type chip, the output power of the small power amplifier chip is 5W, and the power of the speaker is also 5W, so that the speaker can monitor the sound source output by the sound card.

The power module is used for providing working voltage. Specifically, the power module comprises a power filter, a power switch, a first DCDC power circuit, a second DCDC power circuit, a third DCDC power circuit, a first LDO power circuit, a second LDO power circuit, a third LDO power circuit and a lithium battery charging chip.

The power filter is connected between the power switch and the mains supply, the mains supply is connected to the power filter through the inverted-V-shaped connector, the power filter has a common-mode interference resistance function, and the safety is integrated inside and fused when the equipment is in overcurrent. A surge protection circuit is further arranged between the power filter and the switching power supply, and a voltage dependent resistor and a discharge tube are added behind the power filter to release a possible surge so as to protect the safety of the rear-stage switching power supply.

The specification of the power switch is 24V 6.5A, and the power switch can convert 220V alternating current voltage into 24V direct current voltage to be output. The output end of the power switch is electrically connected with the first DCDC power supply circuit, the second DCDC power supply circuit, the third DCDC power supply circuit, the first LDO power supply circuit and the input end of the lithium battery rechargeable battery respectively. The output end of the first DCDC power supply circuit is electrically connected with the input end of the second LDO power supply circuit, and the output end of the second LDO power supply circuit is electrically connected with the input end of the third LDO power supply circuit.

The first DCDC power supply circuit and the second DCDC power supply circuit both adopt TPS54331DR chips, and the first DCDC power supply circuit is used for reducing 24V voltage to 4V voltage and supplying power to the 4G module. The second DCDC power supply circuit is used for reducing the 24V voltage to 5V voltage, and is used as a peripheral power supply on one hand and used for supplying power to the second LDO power supply circuit on the other hand.

The third DCDC power supply circuit adopts an ME3116 chip and is used for reducing 24V voltage to 5V voltage, supplying power to the singlechip, the LED module and the LCD module and simultaneously providing working voltage for the DTMB collector and the small power amplifier chip.

The first LDO power supply circuit adopts a CJ7812 chip and is used for reducing the voltage of 24V to 12V and supplying power to the pickup and the TPA3116 main power amplifier chip.

The first DCDC power supply circuit adopts an ME6211 chip and is used for reducing the voltage of 5V to 3.3V and 1.8V, and the voltage of 3.3V and 1.8V can be used as external power sources. The 3.3V output end is electrically connected with the input end of the third LDO power supply circuit, and the third LDO power supply circuit adopts an AMS1117 chip and is used for reducing the 3.3V voltage to 1.2V voltage and supplying power to the RGB-to-HDMI module.

The lithium battery charging chip adopts a CN3795 type chip, and can adjust the input voltage of 24V to about 12V to charge a 12V lithium battery.

The power module also includes a UPS power source using a DC 24V UPS power interface as a backup power source in an emergency situation.

In this embodiment, this broadcasting adapter still includes power supply control board, mainboard, front panel and LCD control board, and wherein, main control chip sets up on the mainboard, and singlechip, button and LED module set up on the front panel, and the LCD module sets up on the LCD control board, is connected through XH 8P wire rod between mainboard and the front panel, realizes power supply and intercommunication function between mainboard and the front panel. The front panel is connected with the LCD control panel through XH 4P wires, so that the functions of power supply and communication are realized. The DTMB collector and the main board adopt a laminated structural design and are connected through an XH 6P signal line.

The power supply control board is respectively connected with the UPS power supply, the switch power supply and the lithium battery, manages the input of the switch power supply, the UPS power supply and the lithium battery power supply, controls the output and charging of the lithium battery, and finally selects one path of output as the power supply of the TPA3116 main power amplifier chip and the main board.

In summary, the broadcast adapter of the present utility model has the following advantages:

1. the system can realize the functions of broadcasting emergency broadcasting in various channels such as an IP network, frequency modulation broadcasting, DTMB broadcasting, local broadcasting (sound card broadcasting, U disk broadcasting and microphone shouting), and the like, is connected to an emergency broadcasting platform through a wired or wireless network, and can push local audio files to a cloud platform through a wireless or wired network, thereby controlling terminal nodes subordinate to an adapter, realizing the function of broadcasting by a host in response to broadcasting by multiple nodes, for example, through network connection, the system can uniformly broadcast and manage an IP transceiver and an IP sound column bound under the broadcasting adapter, realize accurate broadcasting of content, timely transfer daily information, natural disaster information and the like.

2. The system is provided with an FM receiving module, and can receive emergency broadcast sent by an FM transmitting radio station when network connection is not smooth, so that broadcasting coverage of broadcast audio is improved; the system can be controlled by vehicle-mounted mobile broadcasting and unmanned aerial vehicle broadcasting and is used for broadcasting and releasing post-disaster information islands.

4. The broadcasting adapter supports the Internet of things network card of China radio and television, and solves the problem that old equipment does not support radio and television network communication.

Claims

1. A broadcast adapter, characterized by: the system comprises a main control chip, a wireless network module, a wired network module, a DTMB collector, a sound card, an FM receiving module, an audio signal processing module, a fixed-resistance loudspeaker and a power module; wherein,,

the wireless network module is in communication connection with the main control chip and is used for constructing wireless network connection between the main control chip and the cloud platform;

the wired network module is in communication connection with the main control chip and is used for constructing wired network connection between the main control chip and the cloud platform;

the output end of the DTMB collector is in communication connection with the input end of the main control chip and is used for collecting DTMB broadcast audio to the main control chip;

the input end of the sound card is in communication connection with the output end of the main control chip and is used for converting digital audio signals in the main control chip into analog audio signals and outputting the analog audio signals;

the input end of the FM receiving module is in communication connection with the output end of the main control chip, and the output end of the FM receiving module is in communication connection with the input end of the sound card and is used for receiving FM audio and outputting the FM audio to the sound card;

the input end of the audio signal processing module is in communication connection with the output end of the sound card and is used for selecting and amplifying the audio signals;

the input ends of the at least two resistance-fixed loudspeakers are in communication connection with the output end of the audio signal processing module and are used for playing the audio processed by the audio signal processing module;

the power module is used for providing working voltage.

2. The broadcast adapter according to claim 1, wherein: the wireless network module comprises a 4G module, the 4G module adopts an EC200U-CN chip, a USB Hub chip is arranged between the 4G module and the main control chip, and the 4G module is in communication connection with the main control chip through a USB bus.

3. The broadcast adapter according to claim 2, wherein: the system also comprises an external audio selection input module; the external audio selection input module comprises a first audio input selector, a telephone input interface, a pickup and a line input interface; the output end of the telephone input interface is in communication connection with the input end of the first audio input selector, and a first audio amplifying circuit is arranged between the input end of the telephone input interface and the output end of the 4G module; the output end of the pickup is in communication connection with the input end of the first audio input selector; the circuit input interfaces are provided with a plurality of output ends which are all in communication connection with the input end of the first audio input selector; an output of the first audio input selector is communicatively coupled to an input of the sound card.

4. The broadcast adapter according to claim 1, wherein: the cable network module comprises a PHY chip and an RJ45 network port transformer, wherein the output end and the input end of the PHY chip are respectively in communication connection with the input end of the main control chip and the output end of the RJ45 network port transformer, and the input end of the RJ45 network port transformer is used for being connected with an RJ45 network port.

5. The broadcast adapter according to claim 1, wherein: the DTMB collector comprises a TUNER chip and a DTMB demodulator; the output end of the TUNER chip is in communication connection with the input end of the DTMB demodulator, and the F head antenna is connected to the outside of the TUNER chip; a TS-to-USB conversion module is arranged between the output end of the DTMB demodulator and the input end of the main control chip; the output end of the DTMB demodulator is in communication connection with the input end of the TS-to-USB conversion module, a USB Hub chip is arranged between the output end of the TS-to-USB conversion module and the input end of the main control chip, and the TS-to-USB conversion module is in communication connection with the main control chip through a USB bus.

6. The broadcast adapter according to claim 1, wherein: the FM receiving module comprises two FM chips, and the input ends of the two FM chips are connected with the output end of the main control chip through I2C bus communication; a second audio input selector is arranged between the output ends of the two FM frequency modulation chips and the input end of the sound card.

7. The broadcast adapter according to claim 1, wherein: the audio signal processing module comprises an audio output selector and a TPA3116 main power amplifier chip; the input end of the audio output selector is respectively in communication connection with the output end of the sound card, and the output end is in communication connection with the input end of the TPA3116 main power amplifier chip; the output end of the TPA3116 main power amplifier chip is in communication connection with the input end of the fixed-resistance loudspeaker.

8. The broadcast adapter of claim 7, wherein: the microphone input module comprises a microphone interface, a microphone and a second audio amplifying circuit; the output ends of the microphone interface and the microphone are both in communication connection with the input end of the second audio amplifying circuit, and the output end of the second audio amplifying circuit is respectively in communication connection with the input end of the sound card and the input end of the audio output selector.

9. The broadcast adapter according to claim 1, wherein: the power supply module comprises a power supply filter, a power supply switch, a first DCDC power supply circuit, a second DCDC power supply circuit, a third DCDC power supply circuit, a first LDO power supply circuit, a second LDO power supply circuit, a third LDO power supply circuit and a lithium battery charging chip; the power filter is connected between the power switch and the mains supply, and the power switch can output 24V direct current voltage; the output end of the power switch is electrically connected with the first DCDC power supply circuit, the second DCDC power supply circuit, the third DCDC power supply circuit, the first LDO power supply circuit and the input end of the lithium battery rechargeable battery respectively; the output end of the first DCDC power supply circuit is electrically connected with the input end of the second LDO power supply circuit, and the output end of the second LDO power supply circuit is electrically connected with the input end of the third LDO power supply circuit.

10. The broadcast adapter according to claim 1, wherein: the device also comprises a U disk input interface, a serial port-to-RS 232 module, a TF card slot interface, a singlechip, keys, an LED module, an ADC module, a cannon head, a single-ended-to-balanced output circuit, an RCA line output interface, an RGB-to-HDMI module, an HDMI interface and a small power amplifier chip; wherein,,

a USB Hub chip is arranged between the USB flash disk input interface and the main control chip, and the USB flash disk input interface is in communication connection with the main control chip through a USB data bus;

the output ends of the serial port-to-RS 232 module and the TF card slot interface are both in communication connection with the input end of the main control chip;

the key and the LED module are respectively connected with the input end of the singlechip, and the output end of the singlechip is in communication connection with the input end of the main control chip;

the ADC module is in communication connection with the main control chip;

the input end of the single-ended-to-balanced output module is in communication connection with the output end of the sound card, and the output end of the single-ended-to-balanced output module is in communication connection with the input end of the Cannon head;

the input end of the RCA line output interface is in communication connection with the output end of the sound card;

the output end of the RGB-to-HDMI module is in communication connection with the input end of the main control chip, and the output end of the HDMI interface is in communication connection with the input end of the RGB-to-HDMI module;

the input end of the small power amplifier chip is in communication connection with the output end of the sound card, and the output end of the small power amplifier chip is connected with a loudspeaker.