CN114078480A

CN114078480A - Display device and echo cancellation method

Info

Publication number: CN114078480A
Application number: CN202010819984.1A
Authority: CN
Inventors: 杨香斌
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2022-02-22

Abstract

The embodiment of the application provides a display device and an echo cancellation method, wherein the display device comprises a display, a microphone array, a loudspeaker array and a controller, and the controller is configured to: respectively acquiring a system reference signal of a loudspeaker and an audio signal received by a microphone; calculating coefficients of a first filter for filtering the coefficients of a first filter of echoes produced by loudspeakers of the first region from the system reference signal; according to the position relation of the microphone array and the loudspeaker array, compensating the coefficient of the first filter to obtain the coefficient of a second filter, wherein the second filter is used for filtering echoes generated by the loudspeaker in the second area; and carrying out echo cancellation on the audio signal according to the system reference signal, the coefficient of the first filter and the coefficient of the second filter to obtain a pure signal. The method and the device solve the problem of poor echo cancellation effect in the far field interaction process, and improve the far field interaction experience.

Description

Display device and echo cancellation method

Technical Field

The present application relates to the field of display device technologies, and in particular, to a display device and an echo cancellation method.

Background

With the rapid development of speech recognition technology, speech interaction has become an important human-computer interaction mode. According to different distances of human-computer interaction, voice interaction can be divided into near-field interaction and far-field interaction, wherein the far-field interaction is more convenient for users in partial application scenes, such as voice interaction with a smart television.

In the far-field interaction, in order to avoid specially increasing the volume, microphones can be respectively arranged at a plurality of different positions of the intelligent television to improve the sound collection capability of a user. However, when the smart tv is in a playing state, the larger the number of microphones, the more complicated the echo is; in addition, for a smart tv with multiple channels, multiple speakers are distributed at different locations, which further increases the echo complexity. In order to improve the accuracy of speech recognition, echo cancellation is required.

In the related technology, all sound channels are mixed according to left and right sound channels, namely, signals of all the sound channels on the left side of the intelligent television are mixed into one channel, and signals of all the sound channels on the right side are mixed into one channel, so that two reference signals which are the same as those of a traditional 2.0 sound channel are formed, partial sound actually received by a microphone is offset by the reference signals, and echo cancellation is realized. However, due to the overlapped parts of different sound channels in different frequency bands, after sound in a physical space is mixed by a circuit, part of the sound in the frequency bands is lost, and meanwhile, voice such as time delay information in the space is also lost, which easily causes poor echo cancellation effect, and further causes poor experience of far field interaction.

Disclosure of Invention

In order to solve the technical problem, the application provides a display device and an echo cancellation method.

In a first aspect, the present application provides a display device comprising:

a display;

a microphone array including microphones distributed in a first area and a second area;

a speaker array including speakers distributed over the first area and speakers of the second area;

a controller connected to the display, microphone array, and speaker array, respectively, the controller configured to:

respectively acquiring a system reference signal of the loudspeaker and an audio signal received by the microphone;

calculating coefficients of a first filter for filtering the coefficients of a first filter of echoes produced by loudspeakers of the first region from the system reference signal;

according to the position relation of the microphone array and the loudspeaker array, compensating the coefficient of the first filter to obtain the coefficient of a second filter, wherein the second filter is used for filtering echoes generated by the loudspeaker in the second area;

and carrying out echo cancellation on the audio signal according to the system reference signal, the coefficient of the first filter and the coefficient of the second filter to obtain a pure signal.

In some embodiments, the first and second regions are symmetric about a central axis of the display, the microphones of the first and second regions are symmetric about the central axis, and the speakers of the first and second regions are symmetric about the central axis.

In some embodiments, the compensating the coefficient of the first filter according to the position relationship between the microphone array and the speaker array to obtain the coefficient of the second filter includes:

calculating a sound attenuation ratio between the loudspeaker at the symmetrical position of the first area and the second area to each microphone;

calculating the power amplifier ratio between the loudspeakers at the symmetrical positions of the first area and the second area;

and compensating the coefficient of the first filter according to the product of the sound attenuation ratio and the power amplification ratio to obtain the coefficient of the second filter.

Coefficient of first filter 4, the display device of claim 1, wherein calculating the coefficient of first filter from the system reference signal comprises:

and calculating the coefficient of the self-adaptive filter of the first loudspeaker according to the system reference signal to obtain the coefficient of the first filter.

In a second aspect, an embodiment of the present application provides an echo cancellation method, used in the display device according to the first aspect, where the method includes:

respectively acquiring a system reference signal of a loudspeaker and an audio signal received by a microphone;

according to the position relation of the microphone array and the loudspeaker array, compensating the coefficient of the first filter to obtain the coefficient of a second filter, wherein the second filter is used for filtering the coefficient of the echo first filter generated by the loudspeaker in the second area and the coefficient of the second filter;

and carrying out echo cancellation on the audio signal according to the system reference signal, the coefficient of the first filter and the coefficient of the second filter to obtain a pure signal corresponding to the audio signal.

The display device and the echo cancellation method provided by the application have the beneficial effects that:

according to the method and the device, the display area of the display equipment is divided into the first area and the second area which are symmetrical, the coefficient of the first filter used for filtering echoes between the loudspeaker and the microphone of the first area is calculated, then the coefficient of the first filter is compensated according to the position relation between the loudspeaker and the microphone between the first area and the second area, the coefficient of the second filter is obtained, and the echo of the audio signal is eliminated according to the system reference signal, the coefficient of the first filter and the coefficient of the second filter to obtain the pure signal. According to the method and the device, the echo between each loudspeaker and each microphone is filtered by using the corresponding coefficient of the first filter or the corresponding coefficient of the second filter, the interrupting and awakening rate of far-field interaction can be improved, wherein the coefficient of the second filter is obtained by compensating according to the coefficient of the first filter, the calculation workload is smaller compared with the calculation according to the system reference signal, the awakening response speed of far-field interaction can be guaranteed, and the user experience of far-field interaction can be improved.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a schematic diagram illustrating an operational scenario between a display device and a control apparatus according to some embodiments;

a block diagram of a hardware configuration of a display device 200 according to some embodiments is illustrated in fig. 2;

a block diagram of the hardware configuration of the control device 100 according to some embodiments is illustrated in fig. 3;

a schematic diagram of a software configuration in a display device 200 according to some embodiments is illustrated in fig. 4;

FIG. 5 illustrates an icon control interface display diagram of an application in the display device 200, according to some embodiments;

a schematic distribution diagram of a microphone array and a loudspeaker array according to some embodiments is illustrated in fig. 6;

an audio transmission schematic according to some embodiments is illustrated in fig. 7, according to some embodiments;

a flow diagram of an echo cancellation method according to some embodiments is illustrated in fig. 8;

an echo cancellation schematic according to some embodiments is illustrated in fig. 9;

a schematic diagram of a method of calculating coefficients of a second filter according to some embodiments is illustrated in fig. 10.

Detailed Description

To make the objects, embodiments and advantages of the present application clearer, the following description of exemplary embodiments of the present application will clearly and completely describe the exemplary embodiments of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application, and it is to be understood that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments described herein without inventive step, are intended to be within the scope of the claims appended hereto. In addition, while the disclosure herein has been presented in terms of one or more exemplary examples, it should be appreciated that aspects of the disclosure may be implemented solely as a complete embodiment.

It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.

The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and are not necessarily intended to limit the order or sequence of any particular one, Unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.

The term "module," as used herein, refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the functionality associated with that element.

The term "remote control" as used in this application refers to a component of an electronic device (such as the display device disclosed in this application) that is typically wirelessly controllable over a relatively short range of distances. Typically using infrared and/or Radio Frequency (RF) signals and/or bluetooth to connect with the electronic device, and may also include WiFi, wireless USB, bluetooth, motion sensor, etc. For example: the hand-held touch remote controller replaces most of the physical built-in hard keys in the common remote control device with the user interface in the touch screen.

The term "gesture" as used in this application refers to a user's behavior through a change in hand shape or an action such as hand motion to convey a desired idea, action, purpose, or result.

Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control apparatus according to an embodiment. As shown in fig. 1, a user may operate the display device 200 through the mobile terminal 300 and the control apparatus 100.

In some embodiments, the control apparatus 100 may be a remote controller, and the communication between the remote controller and the display device includes an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, etc., and the display device 200 is controlled by wireless or other wired methods. The user may input a user command through a key on a remote controller, voice input, control panel input, etc. to control the display apparatus 200. Such as: the user can input a corresponding control command through a volume up/down key, a channel control key, up/down/left/right moving keys, a voice input key, a menu key, a power on/off key, etc. on the remote controller, to implement the function of controlling the display device 200.

In some embodiments, mobile terminals, tablets, computers, laptops, and other smart devices may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device. The application, through configuration, may provide the user with various controls in an intuitive User Interface (UI) on a screen associated with the smart device.

In some embodiments, the mobile terminal 300 may install a software application with the display device 200 to implement connection communication through a network communication protocol for the purpose of one-to-one control operation and data communication. Such as: the mobile terminal 300 and the display device 200 can establish a control instruction protocol, synchronize a remote control keyboard to the mobile terminal 300, and control the display device 200 by controlling a user interface on the mobile terminal 300. The audio and video content displayed on the mobile terminal 300 can also be transmitted to the display device 200, so as to realize the synchronous display function.

As also shown in fig. 1, the display apparatus 200 also performs data communication with the server 400 through various communication means. The display device 200 may be allowed to be communicatively connected through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. Illustratively, the display device 200 receives software program updates, or accesses a remotely stored digital media library, by sending and receiving information, as well as Electronic Program Guide (EPG) interactions. The server 400 may be a cluster or a plurality of clusters, and may include one or more types of servers. Other web service contents such as video on demand and advertisement services are provided through the server 400.

The display device 200 may be a liquid crystal display, an OLED display, a projection display device. The particular display device type, size, resolution, etc. are not limiting, and those skilled in the art will appreciate that the display device 200 may be modified in performance and configuration as desired.

The display apparatus 200 may additionally provide an intelligent network tv function of a computer support function including, but not limited to, a network tv, an intelligent tv, an Internet Protocol Tv (IPTV), and the like, in addition to the broadcast receiving tv function.

A hardware configuration block diagram of a display device 200 according to an exemplary embodiment is exemplarily shown in fig. 2.

In some embodiments, at least one of the controller 250, the tuner demodulator 210, the communicator 220, the detector 230, the input/output interface 255, the display 275, the audio output interface 285, the memory 260, the power supply 290, the user interface 265, and the external device interface 240 is included in the display apparatus 200.

In some embodiments, a display 275 receives image signals originating from the first processor output and displays video content and images and components of the menu manipulation interface.

In some embodiments, the display 275, includes a display screen assembly for presenting a picture, and a driving assembly that drives the display of an image.

In some embodiments, the video content is displayed from broadcast television content, or alternatively, from various broadcast signals that may be received via wired or wireless communication protocols. Alternatively, various image contents received from the network communication protocol and sent from the network server side can be displayed.

In some embodiments, the display 275 is used to present a user-manipulated UI interface generated in the display apparatus 200 and used to control the display apparatus 200.

In some embodiments, a driver assembly for driving the display is also included, depending on the type of display 275.

In some embodiments, display 275 is a projection display and may also include a projection device and a projection screen.

In some embodiments, communicator 220 is a component for communicating with external devices or external servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi chip, a bluetooth communication protocol chip, a wired ethernet communication protocol chip, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver.

In some embodiments, the display apparatus 200 may establish control signal and data signal transmission and reception with the external control device 100 or the content providing apparatus through the communicator 220.

In some embodiments, the user interface 265 may be configured to receive infrared control signals from a control device 100 (e.g., an infrared remote control, etc.).

In some embodiments, the detector 230 is a signal used by the display device 200 to collect an external environment or interact with the outside.

In some embodiments, the detector 230 includes a light receiver, a sensor for collecting the intensity of ambient light, and parameters changes can be adaptively displayed by collecting the ambient light, and the like.

In some embodiments, the detector 230 may further include an image collector, such as a camera, etc., which may be configured to collect external environment scenes, collect attributes of the user or gestures interacted with the user, adaptively change display parameters, and recognize user gestures, so as to implement a function of interaction with the user.

In some embodiments, the detector 230 may also include a temperature sensor or the like, such as by sensing ambient temperature.

In some embodiments, the display apparatus 200 may adaptively adjust a display color temperature of an image. For example, the display apparatus 200 may be adjusted to display a cool tone when the temperature is in a high environment, or the display apparatus 200 may be adjusted to display a warm tone when the temperature is in a low environment.

In some embodiments, the detector 230 may also be a sound collector or the like, such as a microphone, which may be used to receive the user's voice. Illustratively, a voice signal including a control instruction of the user to control the display device 200, or to collect an ambient sound for recognizing an ambient scene type, so that the display device 200 can adaptively adapt to an ambient noise.

In some embodiments, as shown in fig. 2, the input/output interface 255 is configured to allow data transfer between the controller 250 and external other devices or other controllers 250. Such as receiving video signal data and audio signal data of an external device, or command instruction data, etc.

In some embodiments, the external device interface 240 may include, but is not limited to, the following: the interface can be any one or more of a high-definition multimedia interface (HDMI), an analog or data high-definition component input interface, a composite video input interface, a USB input interface, an RGB port and the like. The plurality of interfaces may form a composite input/output interface.

In some embodiments, as shown in fig. 2, the tuning demodulator 210 is configured to receive a broadcast television signal through a wired or wireless receiving manner, perform modulation and demodulation processing such as amplification, mixing, resonance, and the like, and demodulate an audio and video signal from a plurality of wireless or wired broadcast television signals, where the audio and video signal may include a television audio and video signal carried in a television channel frequency selected by a user and an EPG data signal.

In some embodiments, the frequency points demodulated by the tuner demodulator 210 are controlled by the controller 250, and the controller 250 can send out control signals according to user selection, so that the modem responds to the television signal frequency selected by the user and modulates and demodulates the television signal carried by the frequency.

In some embodiments, the broadcast television signal may be classified into a terrestrial broadcast signal, a cable broadcast signal, a satellite broadcast signal, an internet broadcast signal, or the like according to the broadcasting system of the television signal. Or may be classified into a digital modulation signal, an analog modulation signal, and the like according to a modulation type. Or the signals are classified into digital signals, analog signals and the like according to the types of the signals.

In some embodiments, the controller 250 and the modem 210 may be located in different separate devices, that is, the modem 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box. Therefore, the set top box outputs the television audio and video signals modulated and demodulated by the received broadcast television signals to the main body equipment, and the main body equipment receives the audio and video signals through the first input/output interface.

In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in memory. The controller 250 may control the overall operation of the display apparatus 200. For example: in response to receiving a user command for selecting a UI object to be displayed on the display 275, the controller 250 may perform an operation related to the object selected by the user command.

In some embodiments, the object may be any one of selectable objects, such as a hyperlink or an icon. Operations related to the selected object, such as: displaying an operation connected to a hyperlink page, document, image, or the like, or performing an operation of a program corresponding to the icon. The user command for selecting the UI object may be a command input through various input means (e.g., a mouse, a keyboard, a touch pad, etc.) connected to the display apparatus 200 or a voice command corresponding to a voice spoken by the user.

As shown in fig. 2, the controller 250 includes at least one of a Random Access Memory 251 (RAM), a Read-Only Memory 252 (ROM), a video processor 270, an audio processor 280, other processors 253 (e.g., a Graphics Processing Unit (GPU), a Central Processing Unit 254 (CPU), a Communication Interface (Communication Interface), and a Communication Bus 256(Bus), which connects the respective components.

In some embodiments, RAM 251 is used to store temporary data for the operating system or other programs that are running.

In some embodiments, ROM 252 is used to store instructions for various system boots.

In some embodiments, the ROM 252 is used to store a Basic Input Output System (BIOS). The system is used for completing power-on self-test of the system, initialization of each functional module in the system, a driver of basic input/output of the system and booting an operating system.

In some embodiments, when the power-on signal is received, the display device 200 starts to power up, the CPU executes the system boot instruction in the ROM 252, and copies the temporary data of the operating system stored in the memory to the RAM 251 so as to start or run the operating system. After the start of the operating system is completed, the CPU copies the temporary data of the various application programs in the memory to the RAM 251, and then, the various application programs are started or run.

In some embodiments, CPU processor 254 is used to execute operating system and application program instructions stored in memory. And executing various application programs, data and contents according to various interactive instructions received from the outside so as to finally display and play various audio and video contents.

In some example embodiments, the CPU processor 254 may comprise a plurality of processors. The plurality of processors may include a main processor and one or more sub-processors. A main processor for performing some operations of the display apparatus 200 in a pre-power-up mode and/or operations of displaying a screen in a normal mode. One or more sub-processors for one operation in a standby mode or the like.

In some embodiments, the graphics processor 253 is used to generate various graphics objects, such as: icons, operation menus, user input instruction display graphics, and the like. The display device comprises an arithmetic unit which carries out operation by receiving various interactive instructions input by a user and displays various objects according to display attributes. And the system comprises a renderer for rendering various objects obtained based on the arithmetic unit, wherein the rendered objects are used for being displayed on a display.

In some embodiments, video processor 270 is configured to receive an external video signal, perform video processing such as decompression, decoding, scaling, noise reduction, frame number conversion, resolution conversion, image synthesis, etc., according to a standard codec protocol of the input signal, and obtain a signal that can be displayed or played on directly displayable device 200.

In some embodiments, video processor 270 includes a demultiplexing module, a video decoding module, an image composition module, a frame number conversion module, a display formatting module, and the like.

The demultiplexing module is used for demultiplexing the input audio and video data stream, and if the input MPEG-2 is input, the demultiplexing module demultiplexes the input audio and video data stream into a video signal and an audio signal.

And the video decoding module is used for processing the video signal after demultiplexing, including decoding, scaling and the like.

And the image synthesis module is used for carrying out superposition mixing processing on the GUI signal input by the user or generated by the user and the video image after the zooming processing by the graphic generator so as to generate an image signal for display.

The frame conversion module is used for converting the input video frame number, such as converting the 60Hz frame number into the 120Hz frame number or the 240Hz frame number, and the common format is realized by adopting a frame interpolation mode.

The display format module is used for converting the received frame number into a video output signal and changing the signal to conform to the display format, such as outputting an RGB data signal.

In some embodiments, the graphics processor 253 and the video processor may be integrated or separately configured, and when the graphics processor and the video processor are integrated, the graphics processor and the video processor may perform processing of graphics signals output to the display, and when the graphics processor and the video processor are separately configured, the graphics processor and the video processor may perform different functions, respectively, for example, a GPU + frc (frame Rate conversion) architecture.

In some embodiments, the audio processor 280 is configured to receive an external audio signal, decompress and decode the received audio signal according to a standard codec protocol of the input signal, and perform noise reduction, digital-to-analog conversion, and amplification processes to obtain an audio signal that can be played in a speaker.

In some embodiments, video processor 270 may comprise one or more chips. The audio processor may also comprise one or more chips.

In some embodiments, the video processor 270 and the audio processor 280 may be separate chips or may be integrated together with the controller in one or more chips.

In some embodiments, the audio output, under the control of controller 250, receives sound signals output by audio processor 280, such as: the speaker 286, and an external sound output terminal of the sound generating device that can output to the external device, in addition to the speaker carried by the display device 200 itself, such as: external sound interface or earphone interface, etc., and may also include a near field communication module in the communication interface, for example: and the Bluetooth module is used for outputting sound of the Bluetooth loudspeaker.

The power supply 290 supplies power to the display device 200 from the power input from the external power source under the control of the controller 250. The power supply 290 may include a built-in power supply circuit installed inside the display apparatus 200, or may be a power supply interface installed outside the display apparatus 200 to provide an external power supply in the display apparatus 200.

A user interface 265 for receiving an input signal of a user and then transmitting the received user input signal to the controller 250. The user input signal may be a remote controller signal received through an infrared receiver, and various user control signals may be received through the network communication module.

In some embodiments, the user inputs a user command through the control apparatus 100 or the mobile terminal 300, the user input interface responds to the user input through the controller 250 according to the user input, and the display device 200 responds to the user input through the controller 250.

In some embodiments, a user may enter user commands on a Graphical User Interface (GUI) displayed on the display 275, and the user input interface receives the user input commands through the Graphical User Interface (GUI). Alternatively, the user may input the user command by inputting a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through the sensor.

In some embodiments, a "user interface" is a media interface for interaction and information exchange between an application or operating system and a user that enables conversion between an internal form of information and a form that is acceptable to the user. A commonly used presentation form of the User Interface is a Graphical User Interface (GUI), which refers to a User Interface related to computer operations and displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in the display screen of the electronic device, where the control may include a visual interface element such as an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget, etc.

The memory 260 includes a memory storing various software modules for driving the display device 200. Such as: various software modules stored in the first memory, including: at least one of a basic module, a detection module, a communication module, a display control module, a browser module, and various service modules.

The base module is a bottom layer software module for signal communication between various hardware in the display device 200 and for sending processing and control signals to the upper layer module. The detection module is used for collecting various information from various sensors or user input interfaces, and the management module is used for performing digital-to-analog conversion and analysis management.

For example, the voice recognition module comprises a voice analysis module and a voice instruction database module. The display control module is used for controlling the display to display the image content, and can be used for playing the multimedia image content, UI interface and other information. And the communication module is used for carrying out control and data communication with external equipment. And the browser module is used for executing a module for data communication between browsing servers. And the service module is used for providing various services and modules including various application programs. Meanwhile, the memory 260 may store a visual effect map for receiving external data and user data, images of various items in various user interfaces, and a focus object, etc.

Fig. 3 exemplarily shows a block diagram of a configuration of the control apparatus 100 according to an exemplary embodiment. As shown in fig. 3, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface, a memory, and a power supply.

The control apparatus 100 is configured to control the display device 200 and may receive an input operation instruction of a user and convert the operation instruction into an instruction recognizable and responsive by the display device 200, serving as an interaction intermediary between the user and the display device 200. Such as: the user operates the channel up/down key on the control device 100, and the display device 200 responds to the channel up/down operation.

In some embodiments, the control device 100 may be a smart device. Such as: the control apparatus 100 may install various applications that control the display device 200 according to user demands.

In some embodiments, as shown in fig. 1, a mobile terminal 300 or other intelligent electronic device may function similar to the control apparatus 100 after an application for manipulating the display device 200 is installed. Such as: the user may implement the function of controlling the physical keys of the apparatus 100 by installing an application, various function keys or virtual buttons of a graphical user interface available on the mobile terminal 300 or other intelligent electronic device.

The controller 110 includes a processor 112 and RAM 113 and ROM 114, a communication interface 130, and a communication bus. The controller is used for controlling the operation of the control device 100, as well as the communication cooperation among the internal components and the external and internal data processing functions.

The communication interface 130 enables communication of control signals and data signals with the display apparatus 200 under the control of the controller 110. Such as: the received user input signal is transmitted to the display apparatus 200. The communication interface 130 may include at least one of a WiFi chip 131, a bluetooth module 132, an NFC module 133, and other near field communication modules.

A user input/output interface 140, wherein the input interface includes at least one of a microphone 141, a touch pad 142, a sensor 143, keys 144, and other input interfaces. Such as: the user can realize a user instruction input function through actions such as voice, touch, gesture, pressing, and the like, and the input interface converts the received analog signal into a digital signal and converts the digital signal into a corresponding instruction signal, and sends the instruction signal to the display device 200.

The output interface includes an interface that transmits the received user instruction to the display apparatus 200. In some embodiments, the interface may be an infrared interface or a radio frequency interface. Such as: when the infrared signal interface is used, the user input instruction needs to be converted into an infrared control signal according to an infrared control protocol, and the infrared control signal is sent to the display device 200 through the infrared sending module. The following steps are repeated: when the rf signal interface is used, a user input command needs to be converted into a digital signal, and then the digital signal is modulated according to the rf control signal modulation protocol and then transmitted to the display device 200 through the rf transmitting terminal.

In some embodiments, the control device 100 includes at least one of a communication interface 130 and an input-output interface 140. The control device 100 is configured with a communication interface 130, such as: the WiFi, bluetooth, NFC, etc. modules may transmit the user input command to the display device 200 through the WiFi protocol, or the bluetooth protocol, or the NFC protocol code.

A memory 190 for storing various operation programs, data and applications for driving and controlling the control apparatus 200 under the control of the controller. The memory 190 may store various control signal commands input by a user.

And a power supply 180 for providing operation power support for each element of the control device 100 under the control of the controller. A battery and associated control circuitry.

In some embodiments, the system may include a Kernel (Kernel), a command parser (shell), a file system, and an application program. The kernel, shell, and file system together make up the basic operating system structure that allows users to manage files, run programs, and use the system. After power-on, the kernel is started, kernel space is activated, hardware is abstracted, hardware parameters are initialized, and virtual memory, a scheduler, signals and interprocess communication (IPC) are operated and maintained. And after the kernel is started, loading the Shell and the user application program. The application program is compiled into machine code after being started, and a process is formed.

Referring to fig. 4, in some embodiments, the system is divided into four layers, which are an Application (Applications) layer (abbreviated as "Application layer"), an Application Framework (Application Framework) layer (abbreviated as "Framework layer"), an Android runtime (Android runtime) and system library layer (abbreviated as "system runtime library layer"), and a kernel layer from top to bottom.

In some embodiments, at least one application program runs in the application program layer, and the application programs can be Window (Window) programs carried by an operating system, system setting programs, clock programs, camera applications and the like; or may be an application developed by a third party developer such as a hi program, a karaoke program, a magic mirror program, or the like. In specific implementation, the application packages in the application layer are not limited to the above examples, and may actually include other application packages, which is not limited in this embodiment of the present application.

The framework layer provides an Application Programming Interface (API) and a programming framework for the application program of the application layer. The application framework layer includes a number of predefined functions. The application framework layer acts as a processing center that decides to let the applications in the application layer act. The application program can access the resources in the system and obtain the services of the system in execution through the API interface.

As shown in fig. 4, in the embodiment of the present application, the application framework layer includes a manager (Managers), a Content Provider (Content Provider), and the like, where the manager includes at least one of the following modules: an Activity Manager (Activity Manager) is used for interacting with all activities running in the system; the Location Manager (Location Manager) is used for providing the system service or application with the access of the system Location service; a Package Manager (Package Manager) for retrieving various information related to an application Package currently installed on the device; a Notification Manager (Notification Manager) for controlling display and clearing of Notification messages; a Window Manager (Window Manager) is used to manage the icons, windows, toolbars, wallpapers, and desktop components on a user interface.

In some embodiments, the activity manager is to: managing the life cycle of each application program and the general navigation backspacing function, such as controlling the exit of the application program (including switching the user interface currently displayed in the display window to the system desktop), opening, backing (including switching the user interface currently displayed in the display window to the previous user interface of the user interface currently displayed), and the like.

In some embodiments, the window manager is configured to manage all window processes, such as obtaining a display size, determining whether a status bar is available, locking a screen, intercepting a screen, controlling a display change (e.g., zooming out, dithering, distorting, etc.) and the like.

In some embodiments, the system runtime layer provides support for the upper layer, i.e., the framework layer, and when the framework layer is used, the android operating system runs the C/C + + library included in the system runtime layer to implement the functions to be implemented by the framework layer.

In some embodiments, the kernel layer is a layer between hardware and software. As shown in fig. 4, the core layer includes at least one of the following drivers: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (such as fingerprint sensor, temperature sensor, touch sensor, pressure sensor, etc.), and so on.

In some embodiments, the kernel layer further comprises a power driver module for power management.

In some embodiments, software programs and/or modules corresponding to the software architecture of fig. 4 are stored in the first memory or the second memory shown in fig. 2 or 3.

In some embodiments, for a display device with a touch function, taking a split screen operation as an example, the display device receives an input operation (such as a split screen operation) that a user acts on a display screen, and the kernel layer may generate a corresponding input event according to the input operation and report the event to the application framework layer. The window mode (such as multi-window mode) corresponding to the input operation, the position and size of the window and the like are set by an activity manager of the application framework layer. And the window management of the application program framework layer draws a window according to the setting of the activity manager, then sends the drawn window data to the display driver of the kernel layer, and the display driver displays the corresponding application interface in different display areas of the display screen.

In some embodiments, as shown in fig. 5, the application layer containing at least one application may display a corresponding icon control in the display, such as: the system comprises a live television application icon control, a video on demand application icon control, a media center application icon control, an application center icon control, a game application icon control and the like.

In some embodiments, the live television application may provide live television via different signal sources. For example, a live television application may provide television signals using input from cable television, radio broadcasts, satellite services, or other types of live television services. And, the live television application may display video of the live television signal on the display device 200.

In some embodiments, a video-on-demand application may provide video from different storage sources. Unlike live television applications, video on demand provides a video display from some storage source. For example, the video on demand may come from a server side of the cloud storage, from a local hard disk storage containing stored video programs.

In some embodiments, the media center application may provide various applications for multimedia content playback. For example, a media center, which may be other than live television or video on demand, may provide services that a user may access to various images or audio through a media center application.

In some embodiments, an application center may provide storage for various applications. The application may be a game, an application, or some other application associated with a computer system or other device that may be run on the smart television. The application center may obtain these applications from different sources, store them in local storage, and then be operable on the display device 200.

The hardware or software architecture in some embodiments may be based on the description in the above embodiments, and in some embodiments may be based on other hardware or software architectures that are similar to the above embodiments, and it is sufficient to implement the technical solution of the present application.

In some embodiments, the application center may be configured with a voice assistant application to implement intelligent voice services, such as services of searching media assets, adjusting volume, and the like. The user can wake up the voice assistant application by sending a voice signal to the display device, the voice signal can be some preset wake-up words, and after the voice assistant application wakes up, the user can interact with the voice assistant application to perform voice control on the display device.

In some embodiments, when a user inputs a voice signal, such as a wake-up word, to the display device, the display device does not play audio and video, and an audio signal received by a microphone on the display device includes the voice signal of the user and a noise signal of an environment where the display device is located.

In some embodiments, when a user inputs a voice signal, such as a wake-up word, to a display device, the display device is playing an audio and video, an audio signal received by a microphone on the display device is an audio signal being played by the display device in addition to the voice signal and a noise signal of the user, and the audio signal being played by the display device may be referred to as an echo.

In some embodiments, to facilitate voice control of the display device by a user when the user is far away from the display device, the display device may be provided with a microphone array comprising a plurality of differently positioned microphones to improve the collection capability of the user's voice signals.

In some embodiments, to improve the sound effect of the display device, the display device may be provided with a speaker array comprising a plurality of speakers distributed at different positions.

Referring to fig. 6, a schematic diagram of a microphone array and a speaker array distribution according to some embodiments. As shown in fig. 6, the microphone array 500 may be distributed at an upper frame of the display device, the speaker array may be distributed at an upper frame and a lower frame of the display device, and the speaker array may include a speaker 601, a speaker 602, a speaker 603, a speaker 604, a speaker 605, and a speaker 606.

Referring to fig. 7, a schematic diagram of audio transmission according to some embodiments is shown. As shown in fig. 7, the microphone array may include 6 microphones, which are respectively a microphone 1, a microphone 2, a microphone 3, a microphone 4, a microphone 5, and a microphone 6. The speaker array may include 6 speakers, respectively, speaker a, speaker b, speaker c, speaker d, speaker e, and speaker f, where speaker a may be speaker 601 in fig. 6, speaker b may be speaker 602 in fig. 6, speaker c may be speaker 603 in fig. 6, speaker d may be speaker 604 in fig. 6, speaker e may be speaker 605 in fig. 6, and speaker f may be speaker 606 in fig. 6.

In fig. 7, lines between the microphone and the speaker indicate that sound emitted from the speaker can be transmitted to the microphone, and dotted lines indicate a central axis of the display device. The microphone array and the loudspeaker array can be symmetrically distributed on two sides of a central axis of the display device, an area on the left side of the central axis of the display device is a left sound channel area, an area on the right side of the central axis of the display device is a right sound channel area, the left sound channel area can be called a first area, and the right sound channel area can be called a second area, or the left sound channel area can be called the second area, and the right sound channel area is the second area.

It can be seen that the microphones 1-6 can receive the echoes of the speakers a-f, respectively, wherein the echo paths of the microphones 1 and 6 are symmetrical, the echo paths of the microphones 2 and 5 are symmetrical, and the echo paths of the microphones 3 and 4 are symmetrical.

It should be noted that in practical implementation, the echo paths may be difficult to achieve complete symmetry due to the internal spatial structure of the display device, the respective position errors of the microphone and the speaker, and the like.

Based on the audio transmission schematic diagram shown in fig. 7, in order to improve the interrupted wake-up rate on the basis of ensuring a faster wake-up response speed, an embodiment of the present application provides an echo cancellation method, which, referring to fig. 8, may include the following steps:

step S110: a system reference signal of a loudspeaker and an audio signal received by a microphone are respectively obtained.

In some embodiments, when a user inputs a voice signal to the display device, the display device is playing a media asset, the controller of the display device may obtain media asset data currently being played by the system and an audio signal received by each microphone, analyze the media asset data, and obtain a media asset audio signal being played by each speaker, where the media asset audio signal may be referred to as a system reference signal. The audio signals received by the microphone comprise the voice signals and the media asset audio signals.

In some embodiments, when the user inputs a voice signal to the display device, the audio signal of the microphone may include the voice signal.

For example, the audio signals of the microphones 1 to 6 may be: M1-M6.

Step S120: calculating coefficients of a first filter for filtering echoes produced by loudspeakers of the first region from the system reference signal.

In some embodiments, an echo filter may be configured for each audio signal transmitted between the speakers and the microphones to filter out echoes, the total number of filters being the product of the number of speakers and the number of microphones. An echo filter between the loudspeaker and the microphone of the first area can be called a first filter, and the filter coefficient of the first filter is called the coefficient of the first filter; the echo filter between the loudspeaker and the microphone of the second region may be referred to as a second filter, the filter coefficients of which are referred to as the coefficients of the second filter.

For example, in the audio transmission diagram shown in fig. 7, the number of echo filters is 36, and the coefficients of the first filter may include: w1 a-W6 a, W1 b-W6 b and W1 c-W6 c. The coefficients of the second filter may include: w1 d-W6 d, W1 e-W6 e and W1 f-W6 f.

In some embodiments, the echo filter may employ an adaptive filter, and the coefficients of the adaptive filter may be calculated for the first speaker based on the system reference signal to obtain the coefficients of the first filter.

Referring to fig. 9, a schematic diagram of echo cancellation according to some embodiments is shown in fig. 9, where for a far-end input signal x (n), the signal y (n) is obtained after passing through an unknown echo path w (n), y (n) ═ x (n) × w (n), and an observation noise v (n) is added to obtain a desired signal d (n), d (n) ═ y (n) + v (n). x (n) after passing through the adaptive filter w ^ (n), obtaining an estimated echo signal w ^ T (n) x (n), subtracting the estimated echo signal from the expected signal d (n) to obtain an error signal e (n), namely e (n) d (n) -w ^ T (n) x (n), wherein the smaller the value of the error signal, the closer the estimated echo path of the adaptive filter is to the actual echo path.

And adjusting the weight vector of the adaptive filter by adopting an adaptive algorithm to ensure that the estimated echo path w ^ (n) gradually approaches to the real echo path w (n). Obviously, in the AEC (Acoustic Echo cancellation) problem, the selection of the adaptive filter plays a very crucial role in the performance of Echo cancellation. The adaptive filter adjustment process is described below by taking an example in which the adaptive algorithm is an LMS (Least Mean Square) algorithm.

Using the minimum mean square error criterion, by deriving the estimated echo signal and making it equal to 0, we find the result so that the error | e (n) is zero²A minimum of w (n), wherein | e (n) | is used because | e (n) | is non-conductive at a minimum point²To calculate w (n), in the LMS algorithm, the coefficient iteration formula of the filter is:

the iterative process of the coefficients of the filter may include three aspects:

1. by the FIR filter output y (n):

(2) in the formula, i represents the index of the sampling point, and the number of the sampling points with the maximum N, for example, N equals 3200.

2. Calculating the error according to equation (2):

e(n)＝d(n)-y(n) (3)

3. updating the weight of the FIR vector to prepare for the next iteration until steady state convergence is obtained according to the minimum mean square error criterion, wherein the weight vector is the coefficient of the filter, the FIR vector is the weight vector 2 mue (n), and the weight updating formula is as follows:

w(n+1)＝w(n)+2μe(n)x(n) (4)

step S130: and according to the position relation between the microphone array and the loudspeaker array, compensating the coefficient of the first filter to obtain the coefficient of a second filter, wherein the second filter is used for filtering echoes generated by the loudspeaker in the second area.

In some embodiments, the positional relationship between the speakers of the first area and the speakers of the second area may be a symmetric relationship, such as speaker a and speaker f symmetric about the central axis of the display device, speaker b and speaker d symmetric about the central axis of the display device, and speaker c and speaker d symmetric about the central axis of the display device.

In some embodiments, the positional relationship between the microphones of the first area and the microphones of the second area may be a symmetric relationship, such as that the speaker a and the speaker f are symmetric about the central axis of the display device, the speaker b and the speaker d are symmetric about the central axis of the display device, and the speaker c and the speaker d are symmetric about the central axis of the display device.

According to the above symmetry relationship, the coefficient of the first filter can be compensated to obtain the coefficient of the second filter. Referring to fig. 10, a schematic diagram of a method for calculating coefficients of a second filter according to some embodiments is shown in fig. 10, where the method may include steps S310 to S330.

Step S310: and calculating the sound attenuation ratio from the loudspeaker at the symmetrical position of the first area and the second area to each microphone.

In some embodiments, the filtering difference of the filter is affected by the sound attenuation difference according to the sound attenuation formula: AdiV ═ 10lg [1/(4 pi r ^2) ], and a sound attenuation ratio x1 between the loudspeaker at the symmetrical position of the first area and the second area and each microphone can be calculated, wherein r is a sound path length, and can be obtained by measuring the distance between the microphone and the loudspeaker in advance, and the calculation formula is as follows:

x1＝10lg(L1a/L6f) (5)

(5) in the formula, L1a represents the distance from the speaker a to the microphone 1, L1a represents the distance from the speaker a to the microphone 1, and L6f represents the distance from the speaker f to the microphone 6.

Step S320: and calculating the power amplifier ratio between the loudspeakers at the symmetrical positions of the first area and the second area.

In some embodiments, the filtering difference of the filter is affected by the power amplification ratio between the loudspeakers, and the power amplification ratio x2 between the loudspeakers at the symmetrical positions of the first area and the second area is calculated according to the following formula:

x2＝Pa/Pf (6)

(6) in the formula, Pa is the power of the speaker a, and Pf is the power of the speaker f.

Step S330: and compensating the coefficient of the first filter according to the product of the sound attenuation ratio and the power amplification ratio to obtain the coefficient of the second filter.

According to the product of the sound attenuation ratio x1 and the power amplification ratio x2, the filtering difference between the first filter and the second filter can be obtained as follows:

C1＝10lg(L1a/L6f)*Pa/Pf；C2＝10lg(L2a/L5f)*Pb/Pe；C3＝10lg(L3a/L4f)*Pc/Pd；

D1＝10lg(L1b/L6e)*Pb/Pe；D2＝10lg(L2b/L5e)*Pb/Pe；D3＝10lg(L3b/L4e)*Pb/Pe；

E1＝10lg(L1c/L6d)*Pc/Pd；E2＝10lg(L2c/L5d)*Pc/Pd；E3＝10lg(L3c/L4d)*Pc/Pd (7)

(7) wherein C1 is a filter difference coefficient between a coefficient W1a of the first filter and a coefficient W6f of the second filter, wherein the filter difference coefficient is used for representing a difference in filter performance between the two filters, C2 is a filter difference coefficient between a coefficient W2a of the first filter and a coefficient W5f of the second filter, C3 is a filter difference coefficient between a coefficient W3a of the first filter and a coefficient W4f of the second filter, D1 is a filter difference coefficient between a coefficient W1b of the first filter and a coefficient W6E of the second filter, D2 is a filter difference coefficient between a coefficient W2b of the first filter and a coefficient W5E of the second filter, D3 is a filter difference coefficient W3b of the first filter and a coefficient W4E of the second filter, E1 is a filter difference coefficient W1C of the first filter and a coefficient W6 of the second filter, and E1 is a difference coefficient W6955 of the first filter and a coefficient W2 8653, e3 is a filter difference coefficient between the coefficient W3c of the first filter and the coefficient W4d of the second filter.

In some embodiments, each system reference signal is spatially symmetric with respect to the microphone in physical location, and the data of the reference signal is also symmetric, that is, there is only a delay difference between the information that the first speaker arrives at 6 microphones and the information that the second speaker arrives at 6 microphones in corresponding locations, without considering other spatial reflection factors, such as reverberation factors, so that after the coefficients of the first filter are calculated, the coefficients of the first filter can be spatially compensated according to the filter difference coefficients to obtain the coefficients of the second filter.

For example, the coefficients of the second filter may be calculated according to:

W1a＝W6f*C1；W2a＝W5f*C2；W3a＝W4f*C3；

W1b＝W6e*D1；W2b＝W5e*D2；W3b＝W4e*D3；

W1c＝W6d*E1；W2c＝W5d*E2；W3c＝W4d*E3 (8)

step S140: and carrying out echo cancellation on the audio signal according to the system reference signal, the coefficient of the first filter and the coefficient of the second filter to obtain a pure signal.

In some embodiments, after calculating the coefficients of the first filter and the coefficients of the second filter, the audio signal may be echo cancelled, and the calculation formula is as follows:

A1＝M1–Ra*W1a–Rb*W1b–Rc*W1c–Rd*W1d–Re*W1e–Rf*W1f

A2＝M2–Ra*W2a–Rb*W2b–Rc*W2c–Rd*W2d–Re*W2e–Rf*W2f

A3＝M3–Ra*W3a–Rb*W3b–Rc*W3c–Rd*W3d–Re*W3e–Rf*W3f

A4＝M4–Ra*W4a–Rb*W4b–Rc*W4c–Rd*W4d–Re*W4e–Rf*W4f

A5＝M5–Ra*W5a–Rb*W5b–Rc*W5c–Rd*W5d–Re*W5e–Rf*W5f

A6＝M6–Ra*W6a–Rb*W6b–Rc*W6c–Rd*W6d–Re*W6f–Rf*W6f (9)

(9) where M1 is the audio signal received by the microphone 1, M2 is the audio signal received by the microphone 2, M3 is the audio signal received by the microphone 3, M4 is the audio signal received by the microphone 4, M5 is the audio signal received by the microphone 5, and M6 is the audio signal received by the microphone 6.

Ra is the reference signal for loudspeaker a, Rb is the reference signal for loudspeaker b, Rc is the reference signal for loudspeaker c, Rd is the reference signal for loudspeaker d, Re is the reference signal for loudspeaker e, and Rf is the reference signal for loudspeaker f.

The signals are first multiplication signals including Ra, W1, Rc, W1, Ra, W2, Rb, W2, Rc, W3, Rb, W3, Rc, W3, Ra, W4, Rb, W4, Rc, W4, Ra, W5, Rb, W5, Rc, W5, Ra, W6, Rb, W6, Rc, Rd, W1, Re, W1, Rf, W1, Rd, W2, Re, W2, Rf, W2, Rd, W3, Re, W3, Rf, W3, Rd, Re, W4, Rd, Rf, W4, Rd, W4, Rf, Re, W4, Re, W5, Re, and Rf 6.

A1 is a clean signal component corresponding to the audio signal received by the microphone 1, a2 is a clean signal component corresponding to the audio signal received by the microphone 2, A3 is a clean signal component corresponding to the audio signal received by the microphone 3, a4 is a clean signal component corresponding to the audio signal received by the microphone 4, a5 is a clean signal component corresponding to the audio signal received by the microphone 5, and a6 is a clean signal component corresponding to the audio signal received by the microphone 6.

And superposing all the pure signal components to obtain a pure signal corresponding to the audio signal.

Further, the controller of the display device may perform voice recognition on the clean signal to obtain a user request, and control the display device according to the user request. For example, after the voice recognition is performed on the clean signal, if the user request is "reduce the volume", the volume of the currently playing audio/video is reduced.

As can be seen from the foregoing embodiments, in the embodiments of the present application, the display area of the display device is divided into the first area and the second area which are symmetrical, the coefficient of the first filter for filtering the echo between the speaker and the microphone in the first area is calculated, the coefficient of the first filter is compensated according to the position relationship between the speaker and the microphone between the first area and the second area to obtain the coefficient of the second filter, and the echo of the audio signal is cancelled according to the system reference signal, the coefficient of the first filter, and the coefficient of the second filter to obtain the clean signal. According to the method and the device, the echo between each loudspeaker and each microphone is filtered by using the corresponding coefficient of the first filter or the corresponding coefficient of the second filter, the interrupting and awakening rate of far-field interaction can be improved, wherein the coefficient of the second filter is obtained by compensating according to the coefficient of the first filter, the calculation workload is smaller compared with the calculation according to the system reference signal, the awakening response speed of far-field interaction can be guaranteed, and the user experience of far-field interaction can be improved.

Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.

It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article, or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. The above embodiments of the present application do not limit the scope of the present application.

Claims

1. A display device, characterized in that, comprising:

monitor;

a microphone array, including microphones distributed in the first area and the second area;

a speaker array, including speakers distributed in the first area and speakers in the second area;

a controller, respectively connected with the display, the microphone array and the speaker array, the controller is configured as:

respectively acquiring the system reference signal of the speaker and the audio signal received by the microphone;

calculating coefficients of a first filter according to the system reference signal, the first filter being used to filter the coefficients of the first filter for echoes generated by speakers of the first area;

According to the positional relationship between the microphone array and the speaker array, the coefficients of the first filter are compensated to obtain the coefficients of the second filter, and the second filter is used to filter the echo generated by the speakers in the second area. ;

Perform echo cancellation on the audio signal according to the system reference signal, the coefficients of the first filter, and the coefficients of the second filter to obtain a pure signal.

2 . The display device according to claim 1 , wherein the first area and the second area are symmetrical with respect to a central axis of the display, and the microphones of the first area and the microphones of the second area are about the The central axis is symmetrical, and the speakers in the first area and the speakers in the second area are symmetrical about the central axis.

3. The display device according to claim 2, wherein, according to the positional relationship between the microphone array and the speaker array, the coefficients of the first filter are compensated to obtain the coefficients of the second filter, include:

calculating the sound attenuation ratio between the speakers at the symmetrical positions of the first area and the second area to each of the microphones;

calculating the power amplifier ratio between the speakers at the symmetrical positions of the first area and the second area;

The coefficients of the first filter are compensated according to the product of the sound attenuation ratio and the power amplifier ratio to obtain the coefficients of the second filter.

4. The display device according to claim 1, wherein the calculating the coefficient of the first filter according to the system reference signal, the coefficient of the first filter comprises:

The coefficients of the adaptive filter are calculated on the first speaker according to the system reference signal to obtain the coefficients of the first filter.

5 . The display device according to claim 1 , wherein the echo cancellation is performed on the audio signal according to the system reference signal, the coefficients of the first filter, and the coefficients of the second filter to obtain the The pure signal corresponding to the audio signal, including:

Perform echo cancellation on the microphone according to the system reference signal, the coefficient of the first filter, and the coefficient of the second filter to obtain a pure signal component;

Calculate the sum of pure signal components of all the microphones to obtain a pure signal corresponding to the audio signal.

6 . The display device according to claim 5 , wherein the echo cancellation is performed on the microphone according to the system reference signal, the coefficient of the first filter, and the coefficient of the second filter to obtain a pure signal component. 7 . ,include:

calculating a first product signal of the system reference signal and the coefficients of the first filter;

calculating a second product signal of the system reference signal and the coefficients of the second filter;

The first product signal and the second product signal are respectively subtracted from the audio signal to obtain a pure signal component.

7. An echo cancellation method for a display device, wherein the display device includes a microphone array and a speaker array, the microphone array includes microphones distributed in a first area and a second area, and the microphone array includes Distributing the speakers in the first area and the speakers in the second area, the echo cancellation method includes:

According to the positional relationship between the microphone array and the speaker array, the coefficients of the first filter are compensated to obtain the coefficients of the second filter, and the second filter is used to filter the echo generated by the speakers in the second area. coefficients of the first filter coefficients of the second filter;

Perform echo cancellation on the audio signal according to the system reference signal, the coefficients of the first filter, and the coefficients of the second filter to obtain a pure signal corresponding to the audio signal.

8 . The echo cancellation method according to claim 7 , wherein the first area and the second area are symmetrical with respect to the central axis of the display, and the microphones of the first area and the microphones of the second area are about the The central axis is symmetrical, and the speakers in the first area and the speakers in the second area are symmetrical about the central axis.

9 . The echo cancellation method according to claim 7 , wherein the coefficient of the first filter is compensated according to the positional relationship between the microphone array and the speaker array to obtain the coefficient of the second filter. 10 . ,include:

10. The echo cancellation method according to claim 7, wherein the calculating the coefficient of the first filter according to the system reference signal The coefficient of the first filter comprises: