WO2019227311A1

WO2019227311A1 - Signal processing circuit and device, and method for processing communication mode

Info

Publication number: WO2019227311A1
Application number: PCT/CN2018/088875
Authority: WO
Inventors: 赵宇鹏
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2018-05-29
Filing date: 2018-05-29
Publication date: 2019-12-05
Also published as: CN110337817A; CN110337817B

Abstract

A signal processing circuit, a communication device, an unmanned aerial vehicle, and a method for processing a communication mode. The signal processing circuit comprises: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and a processor. The at least two modems are connected to the signal conversion circuit at different time divisions. The signal conversion circuit is connected to an RF transceiver, and is used to convert a signal sent between the RF transceiver and the modems. The processor is used to control the at least two modems to connect the signal conversion circuit at different time divisions by using the first control circuit, and to control the RF transceiver by using the second control circuit. Embodiments of the present application can reduce a PCB space occupied by a signal processing circuit, and reduce costs of the signal processing circuit.

Description

Signal processing circuit and device, and method for processing communication mode

Copyright statement

The content disclosed in this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure as it appears in the official records and archives of the Patent and Trademark Office.

Technical field

The present application relates to the field of hardware, and more particularly, to a signal processing circuit, a chip, a communication device, a drone, and a processing method for a communication mode.

Background technique

With the development of computer technology, signal processing circuits have been widely used, for example, they can be applied to drones or smart homes.

However, in some applications, it is desirable that the printed circuit board (Printed Circuit Board) space occupied by the signal processing circuit used is as small as possible. In addition, the current cost of the signal processing circuit is relatively high.

Therefore, how to make the signal processing circuit occupy less PCB space and reduce the cost of the signal processing circuit is an urgent problem.

Summary of the Invention

The embodiments of the present application provide a signal processing circuit, a communication device, a drone, and a communication mode processing method, which can reduce the PCB space occupied by the signal processing circuit and reduce the cost of the signal processing circuit.

According to a first aspect, a signal processing circuit is provided, including: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and a processor; wherein the at least two modems are connected to the time-divisionally A signal conversion circuit; the signal conversion circuit is connected to a radio frequency transceiver and is used to transform a signal transmitted between the radio frequency transceiver and the modem; and the processor is used to control the radio frequency using the first control circuit The at least two modems are connected to the signal conversion circuit in a time-sharing manner; the processor or the adjustment demodulator uses the second control circuit to control the radio frequency transceiver.

In a second aspect, a chip is provided, including the signal processing circuit according to the first aspect.

According to a third aspect, there is provided a communication device including the signal processing circuit according to the first aspect.

In a fourth aspect, a drone is provided, including the communication device according to the third aspect.

According to a fifth aspect, a method for processing a communication mode is provided. The method is used for a signal processing circuit. The signal processing circuit includes at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and processing. Wherein the communication modes applicable to each of the at least two modems are different and are connected to the signal conversion circuit in a time-sharing manner; the signal conversion circuit is connected to a radio frequency transceiver and is used for the radio frequency transceiver Transforming a signal transmitted with the modem; the method includes determining a first modem from the at least two modems, the first modem corresponding to a first communication mode, and the first communication mode is Adopted communication mode; the processor uses the first control circuit to connect the first modem with the signal conversion circuit; and the processor uses the second control based on the first communication mode The circuit controls the radio frequency transceiver, or the first modem utilizes the second Circuit controls the RF transceiver.

Therefore, in the embodiment of the present application, the processor uses the first control circuit to control at least two modems to be time-shared with the signal conversion circuit, and the processor or modem uses the second control circuit to control the radio frequency transceiver, so that at least two modems can be implemented. The internal resources of the signal processing circuit are time-multiplexed during operation. Specifically, the processor, the signal conversion circuit, and the second control circuit for controlling the radio frequency transceiver can be time-multiplexed, thereby reducing the number of signals used in the signal processing circuit. A device that communicates with the outside world, thereby reducing the PCB space occupied by the signal processing circuit and reducing the cost of the signal processing circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings used in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some of the present application. For those of ordinary skill in the art, other embodiments may be obtained based on these drawings without paying creative effort.

FIG. 1 is a schematic block diagram of a drone system according to an embodiment of the present application.

FIG. 2 is a schematic block diagram of a signal processing circuit according to an embodiment of the present application.

FIG. 3 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

FIG. 4 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

FIG. 5 is a schematic block diagram of a MUX according to an embodiment of the present application.

FIG. 6 is a schematic block diagram of a DEMUX according to an embodiment of the present application.

FIG. 7 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

FIG. 8 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

FIG. 9 is a schematic flowchart of a communication mode switching method according to an embodiment of the present application.

FIG. 10 is a schematic block diagram of a communication device according to an embodiment of the present application.

FIG. 11 is a schematic block diagram of another communication device according to an embodiment of the present application.

FIG. 12 is a schematic flowchart of a communication mode processing method according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Unless otherwise stated, all technical and scientific terms used in the examples of this application have the same meanings as commonly understood by those skilled in the technical field of this application. The terminology used in this application is for the purpose of describing specific embodiments only, and is not intended to limit the scope of this application.

FIG. 1 is a schematic architecture diagram of an unmanned flight system 100 according to an embodiment of the present application. This embodiment is described by taking a rotorcraft as an example.

The unmanned aerial system 100 may include an unmanned aerial vehicle (UAV) 110, a carrier 120, a display device 130, and a remote control device 140. The UAV 110 may include a power system 150, a flight control system 160, and a chassis 170. UAV 110 can perform wireless communication with remote control device 140 and display device 130.

The chassis 170 may include a fuselage and a tripod (also referred to as a landing gear). The fuselage may include a center frame and one or more arms connected to the center frame. One or more arms extend radially from the center frame. The tripod is connected to the fuselage and is used to support the UAV 110 when landing.

The power system 150 may include an electronic speed governor (referred to as an ESC for short) 151, one or more propellers 153, and one or more electric motors 152 corresponding to the one or more propellers 153, where the electric motor 152 is connected to the electronic governor Between 151 and the propeller 153, the motor 152 and the propeller 153 are arranged on the corresponding arms; the electronic governor 151 is used to receive the driving signal generated by the flight controller 160, and provides a driving current to the motor 152 according to the driving signal to control The speed of the motor 152. The motor 152 is used to drive the propeller to rotate, so as to provide power for UAV 110's flight. This power enables UAV 110 to achieve one or more degrees of freedom. It should be understood that the motor 152 may be a DC motor or an AC motor. In addition, the motor 152 may be a brushless motor or a brush motor.

The flight control system 160 may include a flight controller 161 and a sensing system 162. The sensing system 162 is used to measure the attitude information of the UAV. The sensing system 162 may include at least one of sensors such as a gyroscope, an electronic compass, an Inertial Measurement Unit (IMU), a vision sensor, a GPS (Global Positioning System), and a barometer. The flight controller 161 is used to control the flight of the UAV 110. For example, the flight controller 161 can control the flight of the UAV 110 according to the attitude information measured by the sensing system 162.

The carrier 120 may be used to carry a load 180. For example, when the carrier 120 is a gimbal device, the load 180 may be a photographing device (for example, a camera, a video camera, etc.). The embodiments of the present application are not limited thereto. For example, the carrier may also be used for carrying a weapon or other load. Bearer equipment.

The display device 130 is located on the ground side of the unmanned flight system 100, and can communicate with the UAV 110 wirelessly, and can be used to display the attitude information of the UAV 110. In addition, when the load 123 is a photographing device, an image captured by the photographing device may also be displayed on the display device 130. It should be understood that the display device 130 may be an independent device or may be provided in the remote control device 140.

The remote control device 140 is located on the ground side of the unmanned flight system 100, and can communicate with the UAV 110 wirelessly for remote control of the UAV 110. The remote control device may be, for example, a remote controller or a remote control device installed with an APP (Application, Application) for controlling UAV, such as a smart phone, a tablet computer, or the like. In the embodiment of the present application, receiving a user's input through a remote control device may refer to controlling the UAV through an input device such as a wheel, a button, a button, a joystick on the remote control or a user interface (UI) on the remote control device.

The drone's remote control device can include devices that support different communication modes, for example, it can include devices that support the Institute of Electrical and Electronics Engineers (Electronics and Electronics Engineers, IEEE) 802.11 communication mode (for example, smartphones, tablets) It can also include devices that support non-IEEE802.11 standard device-to-device (Device to Device (D2D)) communication mode (for example, remote control). Generally, the IEEE802.11 communication mode has wider applicability. For example, it can be connected to any intelligent device. Mobile phones, but non-IEEE802.11 standard D2D communication modes, such as private communication modes for drone communications, have better communication performance.

The D2D communication mode may refer to a communication mode in which two or more communication devices (for example, a drone and a remote controller) communicate directly through radio frequency, and does not need to include an access point (Access Point, AP) or base station (Base Station, BS) and other communication infrastructure.

Correspondingly, for the drone, it is also necessary to support different communication modes, that is, different modems (MOdulate DE Modulale, MODEM) are needed.

Due to the high system integration requirements of the drone, it is expected that the PCB space occupied by the signal processing circuit for signal processing is as small as possible. Therefore, the embodiments of the present application provide the following solutions, which can reduce the occupation of the signal processing circuit. PCB space, and can further reduce the cost of signal processing circuits to reduce the cost of drones.

It should be understood that the embodiments of the present application are not limited to the above-mentioned scenarios for remotely controlling the drone through different communication modes, and the embodiments of the present application may also be used in other scenarios, for example, multiple Communication terminal and smart home.

FIG. 2 is a schematic block diagram of a signal processing circuit 200 according to an embodiment of the present application.

It should be understood that the signal processing circuit in the embodiment of the present application may be provided in a chip, and the chip may be referred to as a system chip, a chip system, a system on chip (SOC), or a baseband chip.

As shown in FIG. 2, the signal processing circuit 200 may include at least two modems 210, a signal conversion circuit 220, a first control circuit 230, a second control circuit 240, and a processor 250.

Among them, at least two modems 210 may be connected to the signal conversion circuit 220 in a time-sharing manner for modulating a signal to be output and demodulating the acquired signal.

At least two modems 210 connected to the signal conversion circuit 220 in a time-sharing manner may mean that one modem 210 may be connected to the signal conversion circuit 220 at the same time.

The signal conversion circuit 220 is connected to a radio frequency transceiver (RF, Transceiver, RF Transceiver), and is used to convert signals transmitted between the radio frequency transceiver and the modem 210.

The processor 250 is configured to use the first control circuit 230 to control at least two modems 210 to be time-connected to the signal conversion circuit 220.

The processor 250 or the modem 210 controls the radio frequency transceiver using the second control circuit 240. Specifically, parameters such as radio frequency on or off, path gain, radio frequency bandwidth, and radio frequency channel can be controlled, and the internal working state of the radio frequency chip can also be read through the second control circuit 240.

The signal conversion circuit 220 in the signal processing circuit 200 may be connected to the radio frequency transceiver 300, and the radio frequency transceiver 300 may be independent of the signal processing circuit 200. Of course, the signal processing circuit 200 may also include a radio frequency transceiver. This is not specifically limited.

Therefore, in the embodiment of the present application, the processor 250 uses the first control circuit 230 to control at least two modems 210 to be time-shared with the signal conversion circuit 220, and the processor 250 uses the second control circuit 240 to control the radio frequency transceiver, or In other modes, the modem 210 uses the second control circuit 240 to control the radio frequency transceiver, so that at least two modems 210 can work internally and time multiplexing the internal resources of the signal processing circuit 200. For example, it can time multiplex the processor 250 and signal conversion The circuit 220 and the second control circuit 240 for controlling the radio frequency transceiver can reduce the components in the signal processing circuit 200 for communicating with the outside world, reduce the cost of the signal processing circuit, and reduce the PCB space occupied.

In addition, at least two modems 210 are connected to the same radio frequency transceiver during operation, therefore, only one radio frequency transceiver may be required. Therefore, it has lower equipment cost and occupies less PCB space.

Optionally, in the embodiment of the present application, the above-mentioned processor 250 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a ready-made programmable gate. Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor.

Optionally, in the embodiment of the present application, the signal processing circuit 200 may further include a memory. For example, as shown in FIGS. 3, 4, and 8, the signal processing circuit 200 may include a memory 260. The memory 260 may store computer instructions, and the processor 250 may call the computer instructions stored in the memory 260 to control the connection between the modem 210 and the signal conversion circuit 220 and control the radio frequency transceiver.

Optionally, in the embodiment of the present application, the foregoing memory 260 may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EROM), and an electronic memory. Erase programmable read-only memory (EPROM, EEPROM) or flash memory. The volatile memory may be Random Access Memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM ) And direct memory bus random access memory (Direct Rambus RAM, DR RAM).

Optionally, in the embodiment of the present application, the signal conversion circuit 220 may be configured to convert a signal transmitted between the modem 210 and the radio frequency transceiver.

Specifically, the signal conversion circuit 220 may transform a signal output by the modem 210 to adapt to a radio frequency transceiver, and may transform a signal output by the radio frequency transceiver to adapt to the modem 210.

In an implementation manner, the signal conversion circuit 220 may include a digital-to-analog converter (DAC) (for example, as shown in FIG. 3 and FIG. 4, DAC 220 a), and is configured to process a digital signal output by the modem 210. Digital-to-analog conversion to output to a radio frequency transceiver, and may include an analog to digital converter (ADC) (for example, ADC220b as shown in Figures 3 and 4) for analog signals output by the radio frequency transceiver An analog-to-digital conversion is performed to output to the modem 210.

In one implementation, when the radio frequency transceiver is independent of the signal processing circuit 200 (specifically, the radio frequency chip may be physically independent of the baseband chip), the signal conversion circuit 210 may include a digital radio frequency (DigRF) circuit. (For example, as shown in FIG. 8, DigRF220c), the DigRF can realize the transmission of data signals between the modem 210 and the radio frequency transceiver. At this time, the radio frequency transceiver can have analog-to-digital conversion and digital-to-analog conversion functions to convert the received data. The obtained digital signal is converted into an analog signal and output to a radio frequency front end, or the analog signal from the radio frequency front end is converted into a digital signal for output to the modem 210.

Optionally, in the embodiment of the present application, the first control circuit 230 may include a signal conversion circuit 220 (for example, including a DAC 220a and an ADC 220b as shown in FIGS. 3 and 4, and a DigRF as shown in FIG. 8, for example. 220c) connected switches (for example, switches 232a and 232b as shown in FIGS. 3, 4 and 8), at least two modems 210 are respectively connected to the signal conversion circuit 220 through the switches in a time-sharing manner; the processor 250 is used to control the switches Connection to at least two modems 210.

Where the signal conversion circuit includes an ADC and a DAC, the switch includes a first switch and a second switch (for example, switches 232b and 232a as shown in FIGS. 3 and 4); wherein the at least two modems 210 are respectively Time-sharing connection to the ADC through a first switch (for example, switch 232b shown in FIGS. 3 and 4); and the at least two modems 210 through a second switch (for example, switch 232a shown in FIGS. 3 and 4), respectively ) Time-shared connection with DAC.

The first switch and the second switch may be implemented by one switch, or may be implemented by multiple switches.

Optionally, the switch mentioned in the embodiment of the present application may include a multiplexer (MUX) and a demultiplexer (DEMUX).

For example, as shown in FIGS. 3 and 4, when it is necessary to connect the ADC 220b and the DAC 220a to the modem 210a, the switch 210a (MUX) can be used to connect the modem 210a with the DAC 220a, and the switch 210b (DEMUX) can be used to connect the modem 210a. Connect with ADC220b; if you need to connect ADC220b and DAC220a to modem 210b, you can use this switch 232a (MUX) to connect modem 210b with DAC220a, and use switch 232b (DEMUX) to connect modem 210b with ADC220b.

Optionally, in the embodiment of the present application, the circuit implementation of the MUX may be as shown in FIG. 5. As shown in FIG. 5, the MUX may include an AND gate 232 a-1, an AND gate 232 a-2, an inverter 232 a-3, and an OR gate 232 a-4.

Among them, a and c respectively input the n-th DAC signal output by the modems of different communication modes to the DAC. Assuming the bit width of the DAC is 12 bits, n is 0 to 11; b is the mode selection signal output by the register, indicating The selected mode (that is, the selected modem); d is the digital interface of the DAC digital-to-analog conversion circuit. When the bit width of the DAC is 12 bits, n is also from 0 to 11. Of course, the bit width of the DAC can also be other numbers of bits.

Optionally, in the embodiment of the present application, the circuit implementation of the DEMUX may be as shown in FIG. 6. As shown in FIG. 6, the DEMUX may include an AND gate 232b-1, an AND gate 232b-2, and an inverter 232b-3. Among them, a is a digital interface of the analog-to-digital conversion circuit, and b is a mode selection signal, which indicates the selected mode (that is, the selected adjustment demodulator); c and d are inputs to modems corresponding to different modes, respectively. Of course, the bit width of the ADC can also be other numbers of bits.

Optionally, in the embodiment of the present application, the bit widths of the ADC and the DAC may be different, and may be determined according to the receiving and transmitting communication performance indicators, respectively.

It should be understood that the switches mentioned in the embodiments of the present application may not be MUX and DEMUX.

For example, for modem 210a and modem 210b, they can correspond to different switches. When ADC220b and DAC220a need to be connected to modem 210a, the switches between modem 210b and ADC220b and DAC220a can be opened, and modems 210a and ADC220b can be closed. And DAC220a.

And, when it is necessary to connect the ADC 220b and the DAC 220a to the modem 210b, the switch between the modem 210a and the ADC 220b and the DAC 220a may be opened, and the switch between the modem 210b and the ADC 220b and the DAC 220a may be closed.

Optionally, in the embodiment of the present application, when the signal conversion circuit 210 includes DigRF, the same switch can be used for the path from the radio frequency transceiver to the modem 210 and the path from the modem 210 to the radio frequency transceiver. When the signal change circuit 210 includes DigRF, the radio frequency transceiver may be independent of the signal processing circuit 200.

For example, as shown in FIG. 7, the modem 210a and the modem 210b may be connected to the DigRF 220c in a time-sharing manner through a switch 232c. For the description of other parts of the circuit in FIG. 7, reference may be made to the description for FIG. 2. For brevity, details are not described herein again.

Alternatively, as shown in FIG. 8, when the signal conversion circuit 210 includes DigRF220c, the switch may include a switch 232a (may be MUX) and a switch 232b (may be DEMUX). The switch 232a or the switch 232b is respectively connected to the DigRF220c, and the DigRF220c may It is connected to a radio frequency transceiver 300 independent of the signal processing circuit 200. For the description of other parts of the circuit in FIG. 8, reference may be made to the description for FIGS. 3 and 4. For brevity, details are not described herein again.

It should be understood that, in the embodiment of the present application, the DigRF used to process signals from the modem to the radio frequency transceiver, and the DigRF used to process signals from the radio frequency transceiver to the modem may be the same DigRF, or they may be independent DigRFs.

Optionally, in the embodiment of the present application, the first control circuit 210 includes at least one first control register (for example,

control registers

234a and 234b shown in FIGS. 3, 4 and 8). The processor 250 may control the time-sharing connection of the at least two modems 210 and the signal conversion circuit 220 through the at least one first control register.

Specifically, the processor 250 is configured to control the connection of the switch to at least two modems 210 (for example,

modems

210a and 210b shown in FIGS. 3, 4 and 8) through at least one first control register, so as to control the at least one The two modems 210 are time-shared with the signal conversion circuit 210.

For example, as shown in FIGS. 3, 4 and 8, the first control circuit includes a control register 234a and a control register 234b, and the processor 250 may use the register 234a to control the switch 232a, and use the control register 234b to control the switch 232b.

It should be understood that the first control register (for example,

control registers

234a and 234b shown in FIGS. 3, 4 and 8) and the processor 250 may be separate devices, or the first control register may also be a processor A part of 250 is not specifically limited in this embodiment of the present application.

Optionally, in an implementation manner of the embodiment of the present application, as shown in FIGS. 3 and 8, the radio frequency transceiver 300 may be independent of the signal processing circuit 200. Specifically, it may be understood that the radio frequency chip and the baseband chip are independent. .

Wherein, when the radio frequency transceiver 300 is independent of the baseband chip, the radio frequency transceiver 300 can be controlled by the second control circuit 240. At this time, as shown in FIGS. 3 and 8, the second control circuit 240 may be a serial peripheral Interface (SPI) 240a, of course, can also be other control interfaces, for example, it can be a mobile industry processor interface (Mobile Industry Processor Interface, MIPI) radio frequency front end (Radio Frequency Front Front End (RFFE) interface or single wire interface, this application The embodiment does not specifically limit this.

Optionally, when the radio frequency transceiver 300 is independent of the signal processing circuit, the signal conversion circuit 220 may include DigRF, or include an ADC and a DAC.

Wherein, when the radio frequency transceiver 300 is independent of the signal processing circuit, the signal conversion circuit 220 (for example, the ADC 220b and DAC 220a shown in FIG. 3 or the DigRF circuit shown in FIG. 8) can pass through the radio frequency transceiver 300. Pin circuit connection.

The data interface between the radio frequency transceiver 300 and the signal processing circuit 200 may also be other interfaces than DAC and ADC, or DigRF.

Optionally, in the embodiment of the present application, the radio frequency transceiver 300 may be connected to the radio frequency front end 400, and the radio frequency front end 400 may amplify the signal output by the radio frequency transceiver 300 and output it to the receiving end through an antenna.

Optionally, in another implementation manner of the embodiment of the present application, as shown in FIG. 4, the signal processing circuit 200 further includes a radio frequency transceiver 270. Specifically, the radio frequency transceiver 270 may be integrated in the signal processing circuit 200, and no external radio frequency chip is required. The internal resources of the signal processing circuit 200 may be time-multiplexed. Specifically, the processor, memory, signal conversion circuit, and radio frequency may be multiplexed. Transceivers, etc., can thereby further reduce the number of components of the signal processing circuit, reduce the cost of the signal processing circuit, and reduce the PCB space occupied by the signal processing circuit.

Optionally, as shown in FIG. 4, the radio frequency transceiver 270 in the signal processing circuit 200 may be connected to the radio frequency front end 400, and the radio frequency front end 400 may amplify the signal output by the radio frequency transceiver 270 and output it to the receiving end through an antenna. .

When the radio frequency transceiver 270 is integrated in the signal processing circuit 300, the second control circuit 240 may be a second control register 240b, that is, the processor 250 or the modem 210 may control radio frequency transmission and reception through the second control register 240b.器 270。 270.

It should be understood that, in the embodiment of the present application, the second control register 240b may be a device independent of the processor 250, or may be a part of the processor 250, which is not specifically limited in the embodiment of the present application.

Optionally, when the radio frequency transceiver 270 is integrated in the signal processing circuit 300, the signal conversion circuit 220 may include an ADC and a DAC (such as the ADC 220b and the DAC 220a shown in FIG. 4).

Optionally, in the embodiment of the present application, at least two modems 210 may be implemented by using the same semiconductor process.

Optionally, in the embodiment of the present application, the control registers (for example, the

control registers

234a, 234b, and 240b as shown in FIGS. Interconnect bus communication.

Since only one modem works at any time, the processor and memory inside the signal processing circuit can be shared in time sharing by the corresponding communication mode of the modem, and there is no need to set the processor and memory resources separately.

Among them, the interface between the interconnect bus and the bus device (for example, processor, memory, modem, control register, SPI, etc.) may be in accordance with the Advanced Microcontroller Bus Architecture (AMBA) standard or other standards or private The interface of the protocol; the bus structure can support a crossbar matrix (Crossbar) bus structure, a network bus structure, or other structures. Bus devices can communicate through the bus. For example, the processor can read and write memory, control registers, and SPI through the bus.

It should be understood that the signal processing circuit 200 or switch shown in FIG. 2-8 is only a schematic diagram, and the signal processing circuit or switch in the embodiment of the present application should not be particularly limited.

For example, although two modems are shown in FIGS. 2-4, 7 and 8, the embodiments of the present application are not limited thereto, and the embodiments of the present application may be used in a scenario of three or more modems.

For example, the signal processing circuits shown in FIGS. 2-4, 7 and 8 may further include other devices, for example, channel encoders, etc., which may be specifically used to perform channel coding and encryption of service information and control information, and Output to modem.

For example, although two switches are shown in FIGS. 3, 4, and 8, the embodiment of the present application is not limited thereto. The signal processing circuit 200 in the embodiment of the present application may include other numbers of switches, for example, may include one switch. For example, the MUX and DEMUX mentioned in the embodiments of the present application may be implemented by a switch.

For example, the SPI or the second control register in Figures 3, 4, 7, and 8 can also be connected to a modem and controlled by the modem.

Optionally, in the embodiment of the present application, at least two modems 210 included in the signal processing circuit 200 may be different modems. Of course, it can also be the same modem, which is not specifically limited in this embodiment of the present application.

Optionally, in the embodiments of the present application, different modems may be different communication modes applicable to the modems, different modulation and demodulation methods used, or different internal structures.

In order to understand the present application more clearly, detailed descriptions will be given below in combination with different modems, which may be different communication modes applicable to modems.

It should be understood that the following embodiments may be applicable to other scenarios through modification, for example, different modulation and demodulation modes applicable to different modems.

Optionally, in the embodiments of the present application, different communication modes may be understood as different communication protocols (or communication standards).

Wherein the communication protocol includes but not limited to 5G (5 ^th Generation) communication protocols, Long Term Evolution (Long Term Evolution, LTE) communications protocol, 3G (3 ^rd Generation) communication protocol, IEEE802.11 protocol, the non-IEEE802.11 D2D communication protocol.

In this case, the at least two modems may use different communication protocols among these communication protocols.

For example, the signal processing circuit 200 may include two modems, and the communication modes corresponding to the two modems are a communication mode using the IEEE802.11 communication protocol and a communication mode using the D2D communication protocol.

It should be understood that the communication protocol (or communication standard) in the embodiments of the present application is not limited thereto.

For example, the IEEE802.11 communication protocol can be further subdivided into IEEE802.11a, IEEE802.11b, IEEE802.11g, IEEE802.11n, IEEE802.11ac, IEEE802.11ax, and so on. And, the LTE communication protocol can be subdivided into multiple versions. At this time, different modems can use a more subdivided different communication protocol or communication standard.

Optionally, in the embodiment of the present application, the frequency bands required for the at least two communication modes are the same frequency band or the frequency band difference is smaller than the first predetermined value. The first predetermined value may be preset in the memory 260.

Optionally, in the embodiment of the present application, a difference in transmit power between at least two communication modes is smaller than a second predetermined value. The second predetermined value may be preset in the memory 260.

Optionally, in the embodiment of the present application, at least two communication modes comply with the same national or regional radio management specifications.

For example, the communication modes mentioned in the embodiments of the present application may include an IEEE 802.11 (for example, 802.11a / b / g / n / ac / ax) communication mode in an unlicensed (exempt) frequency band and a non-IEEE 802.11 standard using the same frequency band. D2D (Device to Device) communication mode.

Specifically, the IEEE 802.11 communication mode and the D2D communication mode use the same License exempt frequency band, comply with the same national or regional radio management specifications, and have close requirements on radio frequency chips. Therefore, they can be implemented with the same radio frequency chip or on a baseband chip. Integrated RF circuit to achieve.

In order to understand this application more clearly, how the processor 210 controls the time-sharing connection between the modem 210 and the signal conversion circuit 220 will be described below.

Specifically, the processor 250 may determine the first modem 210 from at least two modems 220, where the first modem 210 corresponds to a first communication mode, and the first communication mode is a communication mode to be adopted; 210 is connected to the signal conversion circuit 220; and based on the first communication mode, the radio frequency transceiver is controlled by the second control circuit 240, or the first modem 210 can control the radio frequency transceiver by the second control circuit 240.

Optionally, in the embodiment of the present application, the processor 250 receives the first message sent by the remote control device in the second communication mode, and the first message indicates that the communication mode to be adopted is the first communication mode; through the first message, It is determined that the communication mode to be adopted is the first communication mode.

The processor 250 is in the second communication mode, which means that the modem 210 corresponding to the second communication mode is in a communication state with the signal conversion circuit 220.

Optionally, in the embodiment of the present application, when it is determined that it is necessary to switch from the second communication mode to the first communication mode, in the second communication mode, the processor 250 may send a second message to the remote control device to indicate that it is about to be Switching from the second communication mode to the first communication mode.

Optionally, in the embodiment of the present application, the processor 250 may start a timer, and when the timer expires, if the third message that refuses to switch the communication mode is not received, the first control circuit 230 is used to disconnect the signal. The connection of the conversion circuit 220 to the second modem 210 corresponding to the second communication mode, and the connection of the signal conversion circuit 230 to the first modem 210 for switching the communication mode.

The processor 250 may start the timer at a time after the second message is sent. Of course, the processor 250 in the embodiment of the present application may also start a timer at another time, which is not specifically limited in this application.

Optionally, in the embodiment of the present application, after switching the communication mode, the processor 250 completes synchronization and establishes a wireless communication connection based on the first communication mode.

Optionally, the signal processing circuit is used in a drone.

Specifically, the drone remote control device may include a device supporting a non-IEEE 802.11 D2D communication mode, such as a remote control, and a device supporting an IEEE 802.11 communication mode, such as a mobile phone. The drone needs to be connected with two types of remote control devices Communication, but generally do not need to communicate with two types of remote control devices at the same time, and the drone has a high volume requirement, so the signal processing circuit in the embodiment of the present application can be used in the drone, which can reduce the drone The PCB board takes up space and does not reduce the drone's communication performance.

For ease of understanding, a drone is taken as an example below, and how to switch the communication mode will be described with reference to FIG. 9.

In 510, the user is using a mobile phone to communicate with the drone through the IEEE802.11 communication mode. At this time, the user issues a communication mode switching command through the APP on the mobile phone side and transmits it to the drone through the current wireless link.

In 520, the drone parses the received handover command and issues a handover response over the current wireless link.

In 530, the APP on the user's mobile phone terminal receives the response, and the APP on the mobile phone terminal informs the user to start switching. At this time, the IEEE802.11 communication connection will be closed. At this time, the user can start the D2D remote controller and wait for the drone to establish a link with the remote controller.

In 540, after the drone responds, a timer can be started.

In 550, when the timer expires, if there is no other operation instruction from the user, the communication mode switching process is entered, the current IEEE802.11 communication link is closed, the D2D communication mode is started, that is, the modem corresponding to the IEEE802.11 communication mode is cut off Connection to a signal conversion circuit, and connection of a modem corresponding to the D2D communication mode with the signal conversion circuit.

In 560, the drone and remote control use the D2D communication mode, complete synchronization and establish a wireless communication link, and start communication.

Optionally, in the embodiment of the present application, the processor may further determine that the communication mode to be adopted is the first communication mode based on a user setting.

For example, for a drone, a communication mode switch can be set on the drone, and the user should set the switch before using the drone. When the UAV signal processing circuit is running, it automatically determines the switch status and sets the corresponding communication mode, that is, the connection between the corresponding modem and the signal conversion circuit.

The embodiments of the present application can be applied to various types of drones (also referred to as UAVs). For example, the UAV can be a small UAV. In some embodiments, the UAV may be a rotorcraft, for example, a multi-rotor aircraft propelled by multiple propulsion devices through air. The embodiments of the present application are not limited to this, and the UAV may also be another type of UAV or Removable device.

It should be understood that the signal processing circuit in the embodiment of the present application may also be used in other machines or devices, for example, it may be used in a smart home or a mobile phone.

An embodiment of the present application further provides a chip, which may include the signal processing device 200 in the foregoing embodiment.

An embodiment of the present application further provides a communication device, and the communication device may include the signal processing circuit 200 in the foregoing embodiment.

In an implementation manner, as shown in FIG. 10, the communication device 600 may include a signal processing circuit 610, a radio frequency transceiver 620, and a radio frequency front end 630. The radio frequency front end 630 is connected to the radio frequency transceiver 620; the radio frequency transceiver 620 is connected to the signal processing circuit 610. At this time, the radio frequency transceiver 620 and the radio frequency front end 630 are independent of the signal processing circuit 610.

For specific structures and functions of the signal processing circuit 610, the radio frequency transceiver 620, and the radio frequency front end 630, reference may be made to the foregoing description, and details are not described herein again.

As shown in FIG. 11, the communication device 700 may include a signal processing circuit 710 and a radio frequency front end 720. The signal processing circuit 710 includes a radio frequency transceiver 712; the radio frequency front end 720 is connected to the radio frequency transceiver 712 included in the signal processing circuit 710.

For specific structures and functions of the signal processing circuit 710, the radio frequency transceiver 712, and the radio frequency front end 720, reference may be made to the foregoing description, and details are not described herein again.

Optionally, the communication device 600 or 700 further includes a setting section; the setting section is used to set a communication mode to be adopted.

Specifically, the setting unit may specifically be a communication mode switch as described above, and details are not described herein again.

Optionally, the communication device 600 or 700 may correspond to the flight controller 161 in FIG. 1, and is configured to implement functions of the flight controller 161.

Alternatively, the communication device in the embodiment of the present application may also be a terminal or a network device, which is not specifically limited in the embodiment of the present application.

An embodiment of the present application provides a drone, which may include a signal processing circuit 200 or include the communication device 600 or 700.

Specifically, the specific structure of the drone may be UAV 110 in FIG. 1, and details are not described herein again.

FIG. 12 is a schematic flowchart of a communication method processing method 800 according to an embodiment of the present application. The method 800 may be used for a signal processing circuit, which includes: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and a processor; wherein different modems of the at least two modems are used for Different communication modes and time-sharing are connected to the signal conversion circuit; the signal conversion circuit is connected to the radio frequency transceiver and is used to transform the signal transmitted between the radio frequency transceiver and the modem.

The signal processing circuit may be specifically shown in the signal processing circuit 200 in FIGS. 2-4, FIG. 7 and FIG. 8. For brevity, details are not described herein again.

The method 800 includes at least part of the following.

In 810, a first modem is determined from at least two modems, the first modem corresponds to a first communication mode, and the first communication mode is a communication mode to be adopted;

In 820, the processor connects the first modem to the signal conversion circuit using the first control circuit; and,

In 830, the processor controls the radio frequency transceiver using the second control circuit based on the first communication mode, or the first modem controls the radio frequency transceiver using the second control circuit.

Optionally, in the embodiment of the present application, in the second communication mode, the processor receives a first message sent by the remote control device, and the first message indicates that the communication mode to be adopted is the first communication mode; through the first message, processing The processor determines that the communication mode to be adopted is the first communication mode.

Optionally, in the embodiment of the present application, when the processor determines that it is necessary to switch from the second communication mode to the first communication mode, the processor sends a second message to the remote control device in the second communication mode to indicate that the second message is to be switched from the second communication mode. The communication mode is switched to the first communication mode.

Optionally, in the embodiment of the present application, a timer is started; when the timer expires, if the third message that refuses to switch the communication mode is not received, the first control circuit is used to disconnect the signal conversion circuit from the second The connection of the second modem corresponding to the communication mode; when the timer expires, if the third message that refuses to switch the communication mode is not received, the signal conversion circuit is connected to the first modem.

Optionally, in the embodiment of the present application, after the communication mode is switched, synchronization is completed and a wireless communication connection is established based on the first communication mode.

Optionally, in the embodiment of the present application, based on a user setting, the processor determines that the communication mode to be adopted is the first communication mode.

Therefore, in the embodiment of the present application, the processor uses the first control circuit to control at least two modems to be time-shared with the signal conversion circuit, and the processor or modem uses the second control circuit to control the radio frequency transceiver, so that at least two modems can be implemented Internal resources of the signal processing circuit are time-multiplexed during operation, for example, a processor, a signal conversion circuit, and a second control circuit for controlling a radio frequency transceiver can be time-multiplexed, thereby reducing the number of signals used in the signal processing circuit. The device that communicates with the outside world can reduce the cost of the signal processing circuit, and can also make the signal processing circuit occupy less PCB space.

The above is only a specific implementation of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A signal processing circuit, comprising: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and a processor; wherein,

The at least two modems are time-connected to the signal conversion circuit;

The signal conversion circuit is connected to a radio frequency transceiver, and is configured to transform a signal transmitted between the radio frequency transceiver and the modem;

The processor is configured to use the first control circuit to control the at least two modems to be time-connected to the signal conversion circuit;

The processor or the modem uses the second control circuit to control the radio frequency transceiver.
The signal processing circuit according to claim 1, wherein the first control circuit includes a switch connected to the signal conversion circuit, and the at least two modems are respectively separated from the signal conversion circuit through the switch.时连接； When connected;

The processor is configured to control the connection of the switch to the at least two modems.
The signal processing circuit according to claim 2, wherein the first control circuit further comprises at least one first control register, and the processor is configured to control the switch and all the switches through the at least one first control register. The connection of at least two modems is described.
The signal processing circuit according to claim 2 or 3, wherein the switch comprises a multiplexer MUX and a demultiplexer DEMUX.
The signal processing circuit according to any one of claims 2 to 4, wherein the signal conversion circuit includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), and the switch includes a first switch and a second switch. ;

The at least two modems are respectively time-shared with the ADC through the first switch;

The at least two modems are time-shared with the DAC through the second switch, respectively.
The signal processing circuit according to any one of claims 1 to 5, wherein the at least two modems are at least two different modems.
The signal processing circuit according to any one of claims 1 to 6, wherein communication modes applicable to each of the at least two modems are different.
The signal processing circuit according to any one of claims 1 to 7, wherein the processor is further configured to:

Determining a first modem from the at least two modems, the first modem corresponding to a first communication mode, the first communication mode being a communication mode to be adopted; connecting the first modem to the signal conversion circuit Connect; and

The processor is further configured to use the second control circuit to control the radio frequency transceiver based on the first communication mode, or the first modem is further configured to use the second control circuit to control a radio frequency transceiver. The radio frequency transceiver is described.
The signal processing circuit according to claim 8, wherein the processor is further configured to:

In a second communication mode, receiving a first message sent by a remote control device, the first message indicating that the communication mode to be adopted is the first communication mode;

Through the first message, it is determined that the communication mode to be adopted is the first communication mode.
The signal processing circuit according to claim 9, wherein the processor is further configured to:

When it is determined that it is necessary to switch from the second communication mode to the first communication mode, a second message is sent to the remote control device in the second communication mode to indicate that the second communication mode is to be switched from the second communication mode. To the first communication mode.
The signal processing circuit according to claim 10, wherein the processor is further configured to:

Start the timer, and when the timer expires, if the third message that refuses to switch the communication mode is not received, use the first control circuit to disconnect the signal conversion circuit corresponding to the second communication mode Connection of a second modem, and connecting the signal conversion circuit with the first modem for switching a communication mode.
The signal processing circuit according to claim 10 or 11, wherein the processor is further configured to:

After the communication mode is switched, synchronization is completed and a wireless communication connection is established based on the first communication mode.
The signal processing circuit according to claim 8, wherein the processor is further configured to:

Based on a user setting, it is determined that the communication mode to be adopted is the first communication mode.
The signal processing circuit according to any one of claims 7 to 13, characterized in that the frequency bands required for the at least two communication modes are the same frequency band or the frequency band difference is smaller than a first predetermined value; and / or,

The transmission power difference in the at least two communication modes is less than a second predetermined value; and / or,

Observe the same national or regional radio regulations.
The signal processing circuit according to any one of claims 7 to 14, wherein the at least two communication modes include: Institute of Electrical and Electronics Engineers IEEE 802.11 communication mode and / or non-IEEE 802.11 device-to-device D2D Communication mode.
The signal processing circuit according to any one of claims 1 to 15, wherein the signal processing circuit is used in a drone.
The signal processing circuit according to any one of claims 1 to 16, wherein the signal processing circuit further comprises the radio frequency transceiver.
The signal processing circuit according to claim 17, wherein the second control circuit comprises a second control register.
The signal processing circuit according to claim 17 or 18, wherein the signal conversion circuit comprises: an ADC and a DAC.
The signal processing circuit according to any one of claims 1 to 16, wherein the radio frequency transceiver is independent of the signal processing circuit.
The signal processing circuit according to claim 20, wherein the second control circuit comprises a serial peripheral interface SPI, a mobile industry processor interface MIPI radio frequency front-end RFFE interface, or a single-line interface.
The signal processing circuit according to claim 20 or 21, wherein the signal conversion circuit comprises: a digital radio frequency DigRF circuit; or, an ADC and a DAC.
A chip, comprising: the signal processing circuit according to any one of claims 1 to 22.
A communication device, comprising: the signal processing circuit according to any one of claims 1 to 16.
The communication device according to claim 24, wherein the communication device further comprises a radio frequency front end independent of the signal processing circuit; the signal processing circuit includes a radio frequency transceiver;

The radio frequency front end is connected to the radio frequency transceiver included in the signal processing circuit.
The communication device according to claim 25, wherein the second control circuit included in the signal processing circuit includes a second control register.
The communication device according to claim 25 or 26, wherein the signal conversion circuit comprises an ADC and a DAC.
The communication device according to claim 24, wherein the communication device further comprises a radio frequency front end and a radio frequency transceiver, and the radio frequency front end and the radio frequency transceiver are independent of the signal processing circuit;

The radio frequency front end is connected to the radio frequency transceiver;

The radio frequency transceiver is connected to the signal processing circuit.
The communication device according to claim 28, wherein the second control circuit included in the signal processing circuit comprises a serial peripheral interface SPI, a mobile industry processor interface MIPI radio frequency front-end RFFE interface, or a single-line interface.
The communication device according to claim 28 or 29, wherein the signal conversion circuit comprises: a digital radio frequency DigRF circuit; or, an ADC and a DAC.
The communication device according to any one of claims 24 to 30, wherein the communication device further includes a setting section;

The setting section is used to set a communication mode to be adopted.
A drone, comprising: the communication device according to any one of claims 24 to 31.
A method for processing a communication mode, wherein the method is used for a signal processing circuit, and the signal processing circuit includes: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and a processor; Wherein, the communication modes applicable to each of the at least two modems are different and are connected to the signal conversion circuit in a time-sharing manner; the signal conversion circuit is connected to a radio frequency transceiver and is used to connect the radio frequency transceiver with all Transforming signals transmitted between modems;

The method includes:

Determining a first modem from the at least two modems, the first modem corresponding to a first communication mode, the first communication mode being a communication mode to be adopted;

The processor uses the first control circuit to connect the first modem with the signal conversion circuit; and

Based on the first communication mode, the processor controls the radio frequency transceiver using the second control circuit, or the first modem controls the radio frequency transceiver using the second control circuit.
The method according to claim 33, further comprising:

In the second communication mode, the processor receives a first message sent by the remote control device, and the first message indicates that the communication mode to be adopted is the first communication mode;

Through the first message, the processor determines that the communication mode to be adopted is the first communication mode.
The method according to claim 34, further comprising:

When the processor determines that it is necessary to switch from the second communication mode to the first communication mode, the processor sends a second message to the remote control device in the second communication mode to indicate that the second communication mode is to be switched from the second communication mode. The mode is switched to the first communication mode.
The method according to claim 35, further comprising:

Start timer

When the timer expires, if the third message that refuses to switch the communication mode is not received, the first control circuit is used to disconnect the second modem corresponding to the second communication mode from the signal conversion circuit. Connection;

The processor using the first control circuit to connect the first modem to the signal conversion circuit includes:

When the timer expires, if the third message that refuses to switch the communication mode is not received, the signal conversion circuit is connected to the first modem.
The method according to claim 35 or 36, further comprising:

After the communication mode is switched, synchronization is completed and a wireless communication connection is established based on the first communication mode.
The method according to claim 33, further comprising:

Based on a user setting, the processor determines that the communication mode to be adopted is the first communication mode.
The method according to any one of claims 33 to 38, wherein the first control circuit includes a switch connected to the signal conversion circuit, and the at least two modems are connected to the signal through the switch, respectively. The signal conversion circuit is connected in a time-sharing manner.
The method according to claim 39, wherein the first control circuit further comprises at least one first control register, and the method further comprises:

The processor controls the connection of the switch to the at least two modems through the at least one first control register.
The method according to claim 39 or 40, wherein the switch comprises a multiplexer MUX and a demultiplexer DEMUX.
The method according to any one of claims 39 to 41, wherein the signal conversion circuit includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), and the switch includes a first switch and a second switch;

The at least two modems are respectively time-shared with the ADC through the first switch;

The at least two modems are time-shared with the DAC through the second switch, respectively.
The method according to any one of claims 33 to 42, wherein the signal processing circuit further comprises the radio frequency transceiver.
The method according to claim 43, wherein the second control circuit comprises a second control register.
The method according to claim 43 or 44, wherein the signal conversion circuit comprises: an ADC and a DAC.
The method according to any one of claims 33 to 43, wherein the radio frequency transceiver is independent of the signal processing circuit.
The method according to claim 46, wherein the second control circuit comprises a serial peripheral interface SPI, a mobile industry processor interface MIPI radio frequency front-end RFFE interface, or a single-wire interface.
The method according to claim 46 or 47, wherein the signal conversion circuit comprises: a digital radio frequency DigRF circuit; or, an ADC and a DAC.
The method according to any one of claims 33 to 48, wherein the frequency bands required for the at least two communication modes are the same frequency band or the frequency band difference is less than a first predetermined value; and / or,

A difference in transmit power between the at least two communication modes is less than a second predetermined value; and / or,

Observe the same national or regional radio regulations.
The method according to any one of claims 33 to 49, wherein the at least two communication modes include: Institute of Electrical and Electronics Engineers IEEE 802.11 communication mode and / or non-IEEE 802.11 device-to-device D2D communication mode .