CN118317042A

CN118317042A - Display device and method for preventing sound crosstalk

Info

Publication number: CN118317042A
Application number: CN202410240821.6A
Authority: CN
Inventors: 王新宇; 徐磊; 李文龙; 于清晓; 王之奎
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2024-03-04
Filing date: 2024-03-04
Publication date: 2024-07-09

Abstract

The application provides a display device and a method for preventing sound crosstalk, wherein the method comprises the following steps: acquiring a first initial channel signal and a second initial channel signal in an audio source; generating a first reverse phase signal of the first initial channel signal and a second reverse phase signal of the second initial channel signal; the first initial channel signal and the second reverse phase signal are overlapped to generate a first target channel signal, and the second initial channel signal and the first reverse phase signal are overlapped to generate a second target channel signal; the first target channel signal is output to a first speaker and the second target channel signal is output to a second speaker. According to the method, the original signal of the left channel and the reverse signal of the right channel can be overlapped, the original signal of the right channel and the reverse phase signal of the left channel are overlapped, crosstalk signals in the left channel signal and the right channel signal are eliminated, a target sound signal without crosstalk is generated, the definition and the accuracy of sound are improved, and the problem of low sound accuracy output by a loudspeaker is solved.

Description

Display device and method for preventing sound crosstalk

Technical Field

The present application relates to the field of display devices, and in particular, to a display device and a method for preventing crosstalk of sound.

Background

A display device is an intelligent device capable of presenting a user interface and supporting user interaction. Taking intelligent electricity as an example, the intelligent television can integrate various functions such as video, entertainment and data and the like into a whole, and is used for meeting the diversified and personalized requirements of users. To enhance the sound experience of the display device, a stereo sound system may be employed. The stereo sound system outputs different audio signals through the left independent sound channel and the right independent sound channel, and can enable media such as music, films, games and the like to present stereo and immersive sound effects through the stereo sound system.

In order to prevent problems with sound cross-talk in a stereo sound system, directional speakers may be provided for the display device. The directional loudspeaker is a loudspeaker which utilizes the directivity of high-frequency ultrasonic waves to transmit sound, and the working principle is that an audio signal is modulated on an ultrasonic carrier wave with the frequency of more than 20KHz, and the directional transmission of sound is realized through the transmission characteristic of the ultrasonic wave and the nonlinear effect of air. Directional speakers may make sound powerful in a particular area, while rapidly attenuating, or even inaudible, outside that area. By configuring the directional speaker, the output sound can be more concentrated, reducing the lateral propagation of sound to reduce crosstalk. Meanwhile, on the basis of the directional loudspeaker, a stereo coding mode can be adopted to ensure the separation degree between the left channel and the right channel so as to reduce the sound cross.

While directional speakers have the above advantages, the above approach may require additional configuration of directional speakers, thereby increasing the cost of use to the user. Moreover, the limited sound coverage of directional speakers may result in a user not having an optimal listening experience if he leaves a designated area, affecting the accuracy of the sound output by the speakers.

Disclosure of Invention

Some embodiments of the present application provide a display device and a method for preventing crosstalk of sound, so as to solve the problem of low accuracy of sound output by a speaker.

In a first aspect, some embodiments of the present application provide a display apparatus, including:

a display configured to display a user interface;

a controller configured to:

responding to a watching instruction of a user for watching audio and video media assets, and detecting the starting state of the crosstalk prevention function;

When the crosstalk prevention function is started, a first initial channel signal and a second initial channel signal are obtained from an audio source of the audio-video media asset;

generating a first reverse phase signal of the first initial channel signal and generating a second reverse phase signal of the second initial channel signal;

superimposing the first initial channel signal and the second reverse phase signal to generate a first target channel signal, and superimposing the second initial channel signal and the first reverse phase signal to generate a second target channel signal;

the first target channel signal is output to a first speaker and the second target channel signal is output to a second speaker.

In some embodiments, the controller performs acquiring a first initial channel signal and a second initial channel signal in an audio source of the audio-visual asset, further configured to:

identifying an audio data channel for transmitting the audio and video media assets; alternately presenting the first initial channel signal and the second initial channel signal in the audio data channel;

Acquiring a frame synchronization signal in the audio data channel;

detecting a signal state of the frame synchronization signal;

If the signal state is a first level signal state, determining that audio and video media corresponding to the first initial channel signal are transmitted in the audio data channel, and extracting the first initial channel signal from the audio data channel;

And if the signal state is the second level signal state, determining that the audio-video media corresponding to the second initial channel signal is transmitted in the audio data channel, and extracting the second initial channel signal from the audio data channel.

In some embodiments, a first reverse phase signal of the first initial acoustic signal is generated by a phase inversion circuit, and a second reverse phase signal of the second initial channel signal is generated; the phase inversion circuit includes an operational amplifier.

In some embodiments, the controller performs generating a first reverse phase signal of the first initial channel signal, further configured to:

acquiring a first phase of the first initial channel signal;

Inputting the first phase to an operational amplifier;

Phase inversion is performed on the first phase by the operational amplifier to generate a first inverted phase signal.

In some embodiments, the controller is further configured to:

Monitoring a spacing between the first speaker and the second speaker;

calculating a crosstalk value between the first speaker and the second speaker according to the distance;

and creating a crosstalk data table based on the spacing and the crosstalk value.

In some embodiments, the controller is further configured to:

Acquiring a fixed distance between the first loudspeaker and the second loudspeaker;

determining a current crosstalk value in the crosstalk data table based on the fixed spacing;

determining an audio tuning coefficient according to the current crosstalk value and the fixed distance;

And storing the audio tuning coefficient in a register, so that the display device performs the steps of superposing the first initial channel signal and the second reverse phase signal to generate a first target channel signal and superposing the second initial channel signal and the first reverse phase signal to generate a second target channel signal when detecting that the crosstalk prevention function is on.

In some embodiments, the controller is further configured to:

Acquiring the audio tuning coefficient;

creating a superposition matrix for generating the first target channel signal and the second target channel signal;

and filling the audio tuning coefficients into the superposition matrix according to a preset sequence.

In some embodiments, the controller performs superposition of the first initial channel signal and the second reverse phase signal to generate a first target channel signal, further configured to:

Acquiring a first tuning coefficient and a second tuning coefficient in the audio tuning coefficients for generating the first target channel signal from the superposition matrix;

Calculating the product of the first initial channel signal and the first tuning coefficient to generate a first value;

Calculating the product of the second initial channel signal and the second tuning coefficient to generate a second value;

And accumulating the first value and the second value to generate a first target channel signal.

In some embodiments, the controller performs superposition of the second initial channel signal and the first reverse phase signal to generate a second target channel signal, further configured to:

acquiring a third tuning coefficient and a fourth tuning coefficient in the audio tuning coefficients for generating the second target channel signal from the superposition matrix;

calculating the product of the second initial channel signal and the third tuning coefficient to generate a third value;

calculating the product of the first initial channel signal and the fourth tuning coefficient to generate a fourth value;

and accumulating the third value and the fourth value to generate a second target channel signal.

In a second aspect, some embodiments of the present application provide a method for preventing acoustic crosstalk, which may be applied to the display device of the first aspect, the method for preventing acoustic crosstalk including:

As can be seen from the above technical solutions, some embodiments of the present application provide a display device and a method for preventing crosstalk of sound, the method including: acquiring a first initial channel signal and a second initial channel signal from an audio source of an audio-video medium; generating a first reverse phase signal of the first initial channel signal and generating a second reverse phase signal of the second initial channel signal; superposing the first initial channel signal and the second reverse phase signal to generate a first target channel signal, and superposing the second initial channel signal and the first reverse phase signal to generate a second target channel signal; the first target channel signal is output to a first speaker and the second target channel signal is output to a second speaker. According to the method, the initial signal of the left channel and the reverse signal of the right channel can be overlapped, the initial signal of the right channel and the reverse phase signal of the left channel are overlapped, crosstalk signals in the left channel signal and the right channel signal are eliminated, a target sound signal without crosstalk is generated, the definition and the accuracy of sound are improved, and the problem of low sound accuracy output by a loudspeaker is solved.

Drawings

In order to more clearly illustrate some embodiments of the present application or technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an operation scenario between a terminal device and a control device according to some embodiments of the present application;

Fig. 2 is a block diagram of a hardware configuration of a terminal device according to some embodiments of the present application;

FIG. 3 is a block diagram of a hardware configuration of a control device according to some embodiments of the present application;

Fig. 4 is a schematic diagram of software configuration in a terminal device according to some embodiments of the present application;

FIG. 5 is a flowchart illustrating a method for preventing crosstalk of sound performed by a display device according to some embodiments of the present application;

Fig. 6 is a schematic diagram of a scenario in which an anti-crosstalk function is provided in a display device according to some embodiments of the present application;

Fig. 7 is a schematic flow chart of a display device according to some embodiments of the present application for acquiring a first initial channel signal and a second initial channel signal;

Fig. 8 is a schematic diagram of a scenario of speaker spacing and acoustic crosstalk according to some embodiments of the present application;

fig. 9 is a schematic view of a scene in which a display device superimposes channel signals according to some embodiments of the present application;

Fig. 10 is a schematic diagram of a processing procedure of a superposition matrix when a display device according to some embodiments of the present application performs superposition of sound signals;

FIG. 11 is a schematic diagram of the overall logic of a display device according to some embodiments of the present application to perform a method for preventing crosstalk of sound;

fig. 12 is a flowchart of a method for preventing crosstalk according to some embodiments of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of some embodiments of the present application more clear, the technical solutions of some embodiments of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application.

It should be noted that the brief description of the terminology in some embodiments of the application is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the implementation of some embodiments of the application. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.

The terms first, second, third and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

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

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

Fig. 1 is a schematic diagram of an operation scenario between a terminal device and a control device according to some embodiments of the present application. As shown in fig. 1, a user may operate the terminal device 200 through the mobile terminal 300 and the control device 100.

In some embodiments, the control device 100 may be a remote controller, and the communication between the remote controller and the terminal device includes infrared protocol communication or bluetooth protocol communication, and other short-range communication modes, etc., to control the terminal device 200 in a wireless mode or other wired mode. The user can control the terminal device 200 by inputting user instructions through keys on a remote controller, voice input, control panel input, etc.

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

As also shown in fig. 1, the terminal device 200 also communicates data with the server 400 through a variety of communication means. The terminal device 200 may be permitted to make communication connection through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks.

The terminal device 200 may additionally provide an intelligent network television function of a computer support function, including, but not limited to, a network television, an intelligent television, an Internet Protocol Television (IPTV), etc., in addition to the broadcast receiving television function.

Fig. 2 is a block diagram of a hardware configuration of a terminal device according to some embodiments of the present application.

In some embodiments, terminal device 200 includes at least one of a modem 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, memory, a power supply, a user interface.

In some embodiments, the detector 230 is used to collect signals of the external environment or interaction with the outside.

In some embodiments, the display 260 includes a display screen component for presenting a picture, and a driving component for driving an image display, for receiving an image signal from the controller output, for displaying video content, image content, and components of a menu manipulation interface, and a user manipulation UI interface, etc.

In some embodiments, communicator 220 is a component for communicating with external devices or servers according to various communication protocol types.

In some embodiments, the controller 250 controls the operation of the terminal device and responds to the user's operations by various software control programs stored on the memory. The controller 250 controls the overall operation of the terminal device 200.

In some embodiments, a user may input a user command through a Graphical User Interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the Graphical User Interface (GUI).

In some embodiments, user interface 280 is an interface that may be used to receive control inputs.

Fig. 3 is a block diagram of a hardware configuration of a control device according to some embodiments of the present application. 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 device 100 is configured to control the terminal device 200, and can receive an input operation instruction of a user, and convert the operation instruction into an instruction recognizable and responsive by the terminal device 200, functioning as an interaction mediation between the user and the terminal device 200.

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

In some embodiments, as shown in fig. 1, a mobile terminal 300 or other intelligent electronic device may serve a similar function as the control device 100 after installing an application that manipulates the terminal device 200.

The controller 110 includes a processor 112 and RAM 113 and ROM 114, a communication interface 130, and a communication bus. The controller 110 is used to control the operation and operation of the control device 100, as well as the communication collaboration 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 terminal device 200 under the control of the controller 110. 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 touchpad 142, a sensor 143, keys 144, and other input interfaces.

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 provided with a communication interface 130 such as: the WiFi, bluetooth, NFC, etc. modules may send the user input instruction to the terminal device 200 through a WiFi protocol, or a bluetooth protocol, or an NFC protocol code.

A memory 190 for storing various operation programs, data and applications for driving and controlling the control device 100 under the control of the controller. The memory 190 may store various control signal instructions input by a user.

A power supply 180 for providing operating power support for the various elements of the control device 100 under the control of the controller.

Fig. 4 is a schematic view of software configuration in a terminal device according to some embodiments of the present application, in some embodiments, a system is divided into four layers, namely, an application layer (application layer), an application framework layer (Application Framework layer), a An Zhuoyun line layer (Android runtime) and a system library layer (system runtime layer), and a kernel layer from top to bottom.

In some embodiments, at least one application program is running in the application program layer, and these application programs may be a Window (Window) program of an operating system, a system setting program, a clock program, a camera application, and the like; or may be an application developed by a third party developer.

The framework layer provides an application programming interface (Aplication Pogramming Iterface, API) and programming framework for the application programs of the application layer. The application framework layer includes a number of predefined functions. The application framework layer corresponds to a processing center that decides to let the applications in the application layer act.

As shown in fig. 4, the application framework layer in the embodiment of the present application includes a manager (Managers), a Content Provider (Content Provider), a view system (VIEW SYSTEM), and the like.

In some embodiments, the activity manager is to: managing the lifecycle of the individual applications and typically the navigation rollback functionality.

In some embodiments, a window manager is used to manage all window programs.

In some embodiments, the system runtime layer provides support for the upper layer, the framework layer, and when the framework layer is accessed, the android operating system runs the C/C++ libraries contained 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 kernel layer contains at least one of the following drivers: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (e.g., fingerprint sensor, temperature sensor, touch sensor, pressure sensor, etc.), and the like.

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

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

The above embodiments show the hardware/software architecture, functional implementation, and the like of the display device 200. Display device 200 is an intelligent device capable of presenting a user interface and supporting user interaction. Taking intelligent electricity as an example, the intelligent television is display equipment based on the Internet application technology, has an open operating system and a chip, has an open application platform, and can realize a bidirectional man-machine interaction function. The intelligent television can integrate various functions such as video, entertainment and data and is used for meeting the diversified and personalized requirements of users. For example, a user may watch various movies, dramas, shows, etc. through a smart television.

To enhance the audio experience of the display device 200, in some embodiments, the display device 200 may employ a stereo sound system. The stereo system outputs different audio signals through left and right independent channels, and most of earphones, sound boxes and the like adopt left and right double-channel configuration. Through the stereo sound system, media such as music, films, games and the like can be enabled to present stereo and immersive sound effects.

However, in a stereo sound system, there may be a problem of sound crosstalk. Acoustic crosstalk, which is a phenomenon of mutual interference between left and right channels in a stereo sound system, causes a degradation in sound quality of speaker output. For example, in the case of a speaker as a left and right speaker, if crosstalk exists between left and right channels, the following phenomenon occurs. The right horn may also play some extra signals that should not occur when the left horn plays a certain piece of a particular audio signal. Conversely, when the right speaker plays a certain section of a specific audio signal, the left speaker may also play some additional signals that should not occur. This phenomenon not only affects the clarity and accuracy of sound, but also attenuates the stereophonic effect of the speaker output.

To address the problem of acoustic crosstalk, in some embodiments, a directional speaker may be configured for the display device 200. The directional loudspeaker is a loudspeaker which utilizes the directivity of high-frequency ultrasonic waves to transmit sound, and the working principle is that an audio signal is modulated on an ultrasonic carrier wave with the frequency of more than 20KHz, and the directional transmission of sound is realized through the transmission characteristic of the ultrasonic wave and the nonlinear effect of air. Directional speakers may make sound powerful in a particular area, while rapidly attenuating, or even inaudible, outside that area. By configuring the directional speaker, the output sound can be more concentrated, reducing the lateral propagation of sound to reduce crosstalk. Meanwhile, on the basis of the directional loudspeaker, a stereo coding mode can be adopted to ensure the separation degree between the left channel and the right channel so as to reduce the sound cross.

In order to enhance the accuracy of sound output by the speakers, some embodiments of the application provide a display device 200, which display device 200 includes a display 260, an audio output interface 270, and a controller 250. Wherein the display 260 is configured to display a user interface, the audio output interface 270 is configured to connect the first speaker and the second speaker, and the controller 250 is configured to perform a method of preventing acoustic crosstalk. The display device 200 may superimpose the initial signal of the left channel and the reverse signal of the right channel, superimpose the initial signal of the right channel and the reverse phase signal of the left channel, generate a sound signal without crosstalk, improve the clarity and accuracy of sound, and solve the problem of low accuracy of sound output by the speaker.

In order to facilitate understanding of the technical solutions in some embodiments of the present application, the following details of each step are described with reference to some specific embodiments and the accompanying drawings. Fig. 5 is a flowchart of a method for preventing crosstalk of sound performed by a display device according to some embodiments of the present application, as shown in fig. 5, in some embodiments, taking a display device 200 as an example of a television, the method for preventing crosstalk of sound performed by the television may include the following steps S1 to S4, which are specifically as follows:

Step S1: the display device 200 obtains a first initial channel signal and a second initial channel signal in an audio source of an audio-visual medium.

In order to ensure that the user can enjoy a high quality audio output, display device manufacturers may integrate a variety of audio processing functions, one of which is a crosstalk cancellation function, in the television set. In some embodiments, when a user issues an instruction to view audio/video assets through a remote control or other input device, the display device 200 may detect the on state of the anti-crosstalk function to set different sound effect modes according to the on state thereof.

Fig. 6 is a schematic diagram of a scenario in which an anti-crosstalk function is set in a display device according to some embodiments of the present application, as shown in fig. 6, in some embodiments, a sound effect configuration page may be set in the display device 200, and a user may set whether to turn on a crosstalk cancellation function according to actual needs. For example, a plurality of options for setting the sound effects, such as a normal mode, an equalizer mode, a compression mode, an anti-crosstalk function, a voice cancellation function, and the like, may be set in the sound effect configuration page, and when the anti-crosstalk function is in an on state, the function of the display device 200 for crosstalk cancellation is indicated, and when the anti-crosstalk function is in an off state, the function of the display device 200 for crosstalk cancellation is indicated.

It will be appreciated that when the anti-crosstalk function is on, the display device 200 will reduce or eliminate the mixing of sound between the left and right channels by the crosstalk cancellation function, so that the user has a better audible experience. When the crosstalk prevention function is turned off, the display apparatus 200 does not turn on the crosstalk cancellation function, and crosstalk still exists between sounds output from the speakers.

After the detection of the on state of the anti-crosstalk function is completed, when the anti-crosstalk function is started, the display device 200 can acquire the first initial channel signal and the second initial channel signal from the audio source of the audio-video media resource, so as to provide an audio data basis for the subsequent anti-crosstalk function.

In order to acquire the first and second initial channel signals, the display apparatus 200 may perform the following functions. Fig. 7 is a schematic flow chart of acquiring a first initial channel signal and a second initial channel signal by a display device according to some embodiments of the present application, as shown in fig. 7, when the display device 200 acquires the first initial channel signal and the second initial channel signal from an audio source of an audio-video medium, it can first identify an audio data channel for transmitting the audio-video medium, wherein the first initial channel signal and the second initial channel signal alternately appear in the audio data channel, then acquire a frame synchronization signal in the audio data channel, and then detect a signal state of the frame synchronization signal. Upon detection, if the signal state is the first level signal state, the display device 200 may determine that the audio-video media corresponding to the first initial channel signal is transmitted in the audio data channel, and extract the first initial channel signal from the audio data channel; if the signal state is the second level signal state, the display apparatus 200 may determine that the audio-video medium corresponding to the second initial channel signal is transmitted in the audio data channel, and extract the second initial channel signal from the audio data channel.

For example, taking a left channel signal, which is an audio signal of a left channel, and a right channel signal, which is an audio signal of a right channel, which is an audio signal of a second initial channel, as an example, when audio/video media is played in a television, a data line carrying audio information is identified. In some embodiments, the audio data channel may be an I2S digital audio interface, i.e., (INTEGRATED INTERCHIP Sound, IIS) digital audio transmission standard, mainly used for transmitting digital audio data between internal devices of a system of an electronic device, and the I2S digital audio interface may transmit audio signals of audio-video media from a source to a television. In the transmission process of the audio signals, the left channel signals and the right channel signals can alternately appear according to a certain rule, and the alternate appearing mode can ensure that two independent audio streams are effectively transmitted through a single data line.

In addition to containing the actual audio signal, the audio data channel also includes a frame synchronization signal for synchronization, which may assist the television in determining when to begin the decoding process for a frame or segment of the audio data stream. In an actual usage scenario, the television may detect the signal state of a frame synchronization signal, which determines whether a left channel signal or a right channel signal is currently being transmitted.

In some embodiments, the frame synchronization signal may exhibit a first level signal state or a second level signal state. For example, the first level signal state may be a high level state, and the second level signal state may be a low level signal state, where the high level and the low level may be determined according to an actual usage scenario and an actual requirement, which is not specifically limited in the present application. If the frame sync signal state is high, indicating that a left channel signal is being transmitted in the audio data channel, the television may separate and extract the left channel signal from the audio data channel for subsequent processing. Conversely, if the frame sync signal state is low, it indicates that the right channel signal is being transmitted in the audio data channel, and likewise, the television may separate and extract the right channel signal from the audio data channel for subsequent processing, so as to complete the step of acquiring the first initial channel signal and the second initial channel signal from the audio source of the audio-video medium. After the completion of the execution of step S1, the following step S2 may be executed.

Step S2: the display apparatus 200 generates a first reverse phase signal of the first initial channel signal and generates a second reverse phase signal of the second initial channel signal.

After the first and second initial channel signals are acquired, the display apparatus 200 may generate a first reverse phase signal of the first initial channel signal and a second reverse phase signal of the second initial channel signal, providing a data basis for preventing crosstalk of audio data.

In order to generate the inverted phase signals of the first and second initial channel signals, this may be achieved by a phase inversion circuit. In some embodiments, the phase inversion circuit may be an inverting amplifier circuit that is capable of inverting the phase of the input signal by 180 degrees by reversing the phase of the input signal entirely, i.e., the output signal is in phase opposition to the input signal.

In some embodiments, the phase inversion circuit may be an operational amplifier, which is an integrated circuit that amplifies the voltage signal and performs various mathematical operations. By phase inversion by an operational amplifier is meant that the phase difference between the output signal and the input signal is 180 degrees as the signal passes through the operational amplifier, which can be achieved by connecting a feedback circuit to the input of the operational amplifier, the feedback circuit sending a portion of the output signal back to the input to achieve the effect of inverting the phase.

In order to generate the first reverse phase signal of the first initial channel signal, the display apparatus 200 may first acquire the first phase of the first initial channel signal, then input the first phase to the operational amplifier, and then perform phase inversion on the first phase by the operational amplifier to generate the first reverse phase signal.

For example, still taking the first initial channel signal as the left channel signal in the television as an example, after the television acquires the first phase of the left channel signal, the first phase is input to the operational amplifier, and the operational amplifier may perform phase inversion on the input first phase. Specifically, during signal processing, the phase inversion refers to changing the first phase by 180 degrees, i.e., changing the left channel signal peak to the trough and the trough to the peak. For the left channel signal this means that the positive part of the original waveform will become the negative part and the negative part will become the positive part. By such processing, a signal having a phase exactly opposite to that of the original left channel signal, i.e., a first reverse phase signal of the left channel signal, can be generated.

In order to generate the second reverse phase signal of the second initial channel signal, the display apparatus 200 may first acquire the second phase of the second initial channel signal, then input the second phase to the operational amplifier, and then perform phase inversion on the second phase through the operational amplifier to generate the second reverse phase signal.

For example, taking the second initial channel signal as the right channel signal in the television, after the television acquires the second phase of the right channel signal, the second phase is input to the operational amplifier, and the operational amplifier may perform phase inversion on the input second phase. Specifically, the operational amplifier may change the second phase by 180 degrees, i.e., change the right channel signal peak to trough, trough to peak. For the right channel signal this means that the positive part of the original waveform will become the negative part and the negative part will become the positive part. By such processing, a signal having a phase exactly opposite to that of the original right channel signal, i.e., a first two-phase signal of the right channel signal, can be generated.

In some embodiments, the audio signal may be sampled and stored and processed in binary form. For example, both the left channel signal and the right channel signal can be obtained by this form. In order to achieve phase inversion of the left and right channel signals, the phase inversion, i.e., bit-wise inversion, may be achieved by bit manipulation of the value of each sample point. Bit-wise inverting is to change each 1 in the binary number to 0 and each 0 to 1. In audio processing, when a bit-wise inverting operation is performed on a string of binary sample values of a single channel, this is equivalent to 180 degree phase inversion of the signal.

Illustratively, it is assumed that there is one sample point of the left channel signal, the binary representation of which is 01010101. To phase invert this signal, all binary bits can first be identified. In this example, the lowest, right most, bit is 1, followed by 0,1,0,1,0,1,0, arranged in order from right to left. Next, when the bit-wise inverting operation is performed, all 1 s are changed to 0, and all 0 s are changed to 1. Thus, the original binary sequence 01010101 will become 10101010. This new binary sequence 10101010 is the result of the phase inversion of the original left channel signal. The same operation is also applied to each sampling point of the right channel signal.

In some embodiments, the above described bit-wise inverting operation may be accomplished by a digital signal Processor (DIGITAL SIGNAL Processor, DSP) that can quickly perform the bit-wise inverting operation on each audio sample point of the streaming system, thereby achieving phase inversion in the overall audio signal. In practical use scenarios, phase inversion may be used to create an inverse echo effect, or in some audio analysis scenarios to cancel or emphasize a particular signal. The method for acquiring the first reverse phase signal and the second reverse phase signal is not particularly limited, and may be selected according to actual requirements. After the completion of the execution of step S2, the following step S3 may be executed.

Step S3: the display apparatus 200 superimposes the first initial channel signal and the second reverse phase signal to generate a first target channel signal, and superimposes the second initial channel signal and the first reverse phase signal to generate a second target channel signal.

After the generation of the first reverse phase signal of the first initial channel signal and the second reverse phase signal of the second initial channel signal is completed, the display apparatus 200 may superimpose the first initial channel signal and the second reverse phase signal to generate a first target channel signal, and superimpose the second initial channel signal and the first reverse phase signal to generate a second target channel signal. The first target channel signal and the second target channel signal are sound signals after crosstalk processing, so that hearing experience of a user can be improved.

Fig. 8 is a schematic diagram of a scenario of speaker spacing and acoustic crosstalk according to some embodiments of the present application, as shown in fig. 8, when the spacing between two speakers is small, there is a large amount of audio crosstalk, and when the spacing between the two speakers is large, there is a small amount of audio crosstalk. It follows that there is a close correlation between audio crosstalk and spacing between speakers.

To obtain the effect of the spacing between the speakers on sound, in some embodiments, the display device 200 may monitor the spacing between the first speaker and the second speaker, then calculate a crosstalk value between the first speaker and the second speaker based on the spacing, and then create a crosstalk data table based on the spacing and the crosstalk value.

Illustratively, the spacing between the two speakers may be measured first by a sound pressure or level meter, after which the measured spacing may be correlated to the display device 200 so that the display device 200 may monitor the different spacing between the first speaker and the second speaker. It may also be obtained by other methods, for example, by a distance sensor, an infrared or laser range finder or other measuring means, etc., which are not particularly limited by the present application. For each pitch, a crosstalk value between the first speaker and the second speaker may be obtained, i.e. a plurality of crosstalk values may be calculated, which may reflect the degree of acoustic interference at different pitches.

Based on the spacing and crosstalk values, a crosstalk data table may be created. The sound interference conditions under different distances can be intuitively obtained through the table. For example, the closer the distance between two loudspeakers, the greater the acoustic interference between them, and the further the distance between them, the less the acoustic interference between them, i.e. the situation shown in the scene of fig. 8.

In a practical use scenario, the position of the loudspeakers may not change often, i.e. the spacing between the two loudspeakers may be fixed. Based on this, the display apparatus 200 may acquire a fixed pitch between the first speaker and the second speaker, determine a current crosstalk value in the crosstalk data table based on the fixed pitch, then determine an audio tuning coefficient according to the current crosstalk value and the fixed pitch, and store the audio tuning coefficient in a register, so that the display apparatus 200 performs the steps of superimposing the first initial channel signal and the second reverse phase signal to generate the first target channel signal and superimposing the second initial channel signal and the first reverse phase signal to generate the second target channel signal when detecting that the anti-crosstalk function is on.

By way of example, a fixed distance between the first speaker and the second speaker may be obtained by an infrared ray or a laser range finder, etc., and since the crosstalk data table is created in advance and contains data of the degree of acoustic interference at different distances, the current crosstalk value may be determined by the fixed distance, and the audio tuning coefficient may be determined according to the current crosstalk value and the fixed distance.

In some embodiments, the audio tuning coefficients may be determined in conjunction with actual usage scenarios. For example, taking four audio tuning coefficients as M00, M01, M10, and M11, respectively, M00, M01, M10, and M11 may be parameters configured in the display device 200 for adjusting the sound effects, and different crosstalk values may be generated according to different pitches between the speakers, where a smaller crosstalk value indicates that the current sound effect is better, and where a larger crosstalk value indicates that the current sound effect is worse. Therefore, when the corresponding crosstalk value is smaller at a certain interval, the corresponding parameters are the four audio tuning coefficients. The audio tuning coefficients are determined to have the following rule that the larger the distance between the loudspeakers is, the larger the audio tuning coefficients are, otherwise, the smaller the distance between the loudspeakers is, the smaller the audio tuning coefficients are.

Fig. 9 is a schematic view of a scene of a display device according to some embodiments of the present application, as shown in fig. 9, in some embodiments, lch in is a first initial channel signal, rch in is a second initial channel signal, lch out is a first target channel signal, i.e. a target channel signal output by a left channel, and Rch out is a second target channel signal, i.e. a target channel signal output by a right channel.

When performing channel signal superposition, the display device 200 finally generates a first target channel signal for the left channel, that is, superposes a first initial channel signal such as a left channel signal and a second reverse phase signal such as a right channel reverse phase signal. For the right channel, a second initial channel signal, such as a right channel signal, and a first reverse phase signal, such as a left channel reverse phase signal, are superimposed, and a second target channel signal is finally generated. That is, the process of superimposition is to perform superimposition computation on the left-channel signal and the reverse limit signal of the right channel, and to perform superimposition computation on the right-channel signal and the reverse phase signal of the left channel.

Since crosstalk refers to a phenomenon in which a signal of one channel is received by other channels in a multi-channel audio system, resulting in confusion and degradation of definition of sound, for the display apparatus 200, crosstalk may be mutual interference between left and right channels. In the embodiment of the application, the interference part in the original signal is counteracted by using signals with opposite phases, and based on the phase characteristics of the sound signals, the two signals are counteracted at a certain point if the two phases are opposite.

Specifically, for the left channel, the first initial channel signal, i.e., the initial signal of the left channel, contains sound information desired to be output and crosstalk components received from the right channel, and the second reverse phase signal, i.e., the reverse phase signal of the right channel, is a signal having a phase opposite to that of the initial signal of the right channel. This means that if there is crosstalk from the right channel in the left channel, this crosstalk should be in phase with the right channel signal in the left channel. By superimposing the original signal of the left channel with the inverted phase signal of the right channel, the crosstalk part of the right channel to the left channel is cancelled out, since the two signals of the same frequency and opposite phase add to zero. Therefore, performing sound signal superimposition on the left channel prevents the occurrence of a phenomenon of sound crosstalk on the left channel.

Similarly, for the right channel, the second initial channel signal, i.e., the initial signal for the right channel, contains the desired output sound information and the crosstalk component received from the left channel. The first reverse phase signal, i.e., the reverse phase signal of the left channel, is a signal having a phase opposite to that of the original signal of the left channel, and by superimposing the original signal of the right channel and the reverse phase signal of the left channel, the crosstalk portion of the left channel to the right channel is also cancelled. The end result is that two target channel signals are generated, and the two signals are subjected to crosstalk prevention processing, so that the definition and accuracy of sound can be improved, a user can experience purer sound effect, and the problem of low accuracy of sound output by a loudspeaker can be solved.

In order to specifically perform a specific process of superimposing the first initial channel signal and the second reverse phase signal, and superimposing the second initial channel signal and the first reverse phase signal, in some embodiments, after the four audio tuning coefficients are determined, the display apparatus 200 may obtain the four audio tuning coefficients, then create a superimposing matrix for generating the first target channel signal and the second target channel signal, and then fill the audio tuning coefficients into the superimposing matrix in a preset order.

For example, fig. 10 is a schematic diagram illustrating a processing procedure of a superposition matrix when the display device performs sound signal superposition according to some embodiments of the present application, as shown in fig. 10, after the display device 200 obtains four audio tuning coefficients M00, M01, M10, and M11, M00, M01, M10, and M11 may be filled in a created superposition matrix according to a preset sequence, as shown in the sequence of fig. 10. For this order, when the sound signals are superimposed, different calculation processes may be performed on the left channel and the right channel, respectively.

When generating the first target channel signal, the display device 200 may first acquire a first tuning coefficient and a second tuning coefficient from among audio tuning coefficients for generating the first target channel signal in the superposition matrix, calculate a product of the first initial channel signal and the first tuning coefficient to generate a first value, calculate a product of the second initial channel signal and the second tuning coefficient to generate a second value, and finally accumulate the first value and the second value to generate the first target channel signal.

In some embodiments, taking the first target channel signal as the target channel signal output by the left channel, the first initial channel signal as the initial left channel signal, the second initial channel signal as the initial right channel signal, and the second reverse phase signal as the reverse phase signal of the initial right channel signal as examples, the above process is that when the television generates the left channel target channel signal, the initial left channel signal and the reverse phase signal of the right channel are obtained first, then the first tuning coefficient and the second tuning coefficient in the audio tuning coefficient for generating the left channel target channel signal are obtained, then the product of the initial left channel signal and the first tuning coefficient is calculated to generate a first value, the product of the initial right channel signal and the second tuning coefficient is calculated to generate a second value, and finally the first value and the second value are accumulated to generate the left channel target channel signal.

In the above process, when the product of the initial left channel signal and the first tuning coefficient is calculated, the strength or the characteristic of the initial left channel signal may be adjusted by the first tuning coefficient, for example, some frequency ranges may be strengthened or weakened, or all signal characteristics may be kept unchanged. When the product of the original right channel signal and the second tuning coefficient is calculated, the right channel signal entering the left channel can be counteracted by the second tuning coefficient, and finally, the crosstalk-free left channel target channel signal is generated.

For example, in connection with fig. 10, the above description should satisfy Lch out=m00×lch in+m01×rchin. Where Lch out is the left channel target channel signal, M00 is the first tuning coefficient, lch in is the initial left channel signal, M01 is the second tuning coefficient, and Rch in is the initial right channel signal. For example, M00 may be set to 1 and M01 to-0.4. Such a setting identifies that all signals of Lch in are reserved, and signals of Rch in are multiplied by-0.4 for phase inversion and then added to the left channel signal, that is, the right channel signal in the left channel signal is cancelled by a factor of-0.4.

When generating the second target channel signal, the display apparatus 200 may first acquire the second initial channel signal and the first reverse phase signal in the superposition matrix, then acquire a third tuning coefficient and a fourth tuning coefficient among audio tuning coefficients for generating the second target channel signal, calculate a product of the second initial channel signal and the third tuning coefficient to generate a third value, calculate a product of the first initial channel signal and the fourth tuning coefficient to generate a fourth value, and finally accumulate the third value and the fourth value to generate the second target channel signal.

Similarly, in the above process, when the product of the second initial channel signal and the third tuning coefficient is calculated, the strength, the characteristic, and the like of the initial right channel signal may be adjusted by the third tuning coefficient. When the product of the first initial channel signal and the fourth tuning coefficient is calculated, the left channel signal entering the right channel can be counteracted by the fourth tuning coefficient, and finally, the right channel target channel signal without crosstalk is generated.

For example, with continued reference to fig. 10, the above description should satisfy rchout=m10×rchin+m11×lchin. Where Rch out is the right channel target channel signal, M10 is the third tuning coefficient, rch in is the original right channel signal, M11 is the fourth tuning coefficient, and Lch in is the original left channel signal. For example, M10 may be set to 1, M11 to-0.5, and the left channel signal in the right channel signal is cancelled by a factor of-0.5.

In summary, by superposing the sound signals, the first target channel signal and the second target channel signal without crosstalk can be obtained, so that the hearing experience of the user can be improved. After the completion of the execution of step S3, the following step S4 may be executed.

Step S4: the display device 200 outputs the first target channel signal to the first speaker and outputs the second target channel signal to the second speaker.

In order to output the crosstalk-free sound signal, the display apparatus 200 may output the first target channel signal to the first speaker and the second target channel signal to the second speaker after the first target channel signal and the second target channel signal are generated.

For example, the first speaker may be a speaker of a left channel, and the television may output a left channel target channel signal through the left speaker while outputting sound, and the second speaker may be a speaker of a right channel, and the television may output a right channel target channel signal through the right speaker. That is, the left speaker that outputs the superimposed left channel signal, and the right speaker that outputs the superimposed right channel signal.

Because the first target channel signal and the second target channel signal are processed channel signals preventing crosstalk, the crosstalk is eliminated when the user hears the crosstalk, and the problem of low accuracy of the sound output by the loudspeaker is solved.

To facilitate a further understanding of the technical solution in some embodiments of the present application, the above-described process is summarized below by referring to the overall frame diagram. Fig. 11 is a general logic diagram of a method for performing an anti-crosstalk method for a display device according to some embodiments of the present application, as shown in fig. 11, in some embodiments, in order to perform an anti-crosstalk function, an audio manager, an audio device, a data extraction module, an output module, etc. may be disposed in the display device 200, and after a user selects to turn on the anti-crosstalk function through a remote controller device, an anti-crosstalk function message may be generated and sent to the audio device. After the message transmission is completed, M00, M01, M10 and M11 can be read and stored in a register, and then sound signals are overlapped through M00, M01, M10 and M11, reverse phase signals of left channel signals can be overlapped to a right loudspeaker, reverse phase signals of right channel signals can be overlapped to a left loudspeaker, and the crosstalk elimination function is realized. Thus, the sound output through the loudspeaker is more accurate and clear.

As can be seen from the above technical solutions, the above embodiments provide a display device 200, where the display device 200 may obtain a first initial channel signal and a second initial channel signal from an audio source of an audio-video medium; generating a first reverse phase signal of the first initial channel signal and generating a second reverse phase signal of the second initial channel signal; superposing the first initial channel signal and the second reverse phase signal to generate a first target channel signal, and superposing the second initial channel signal and the first reverse phase signal to generate a second target channel signal; the first target channel signal is output to a first speaker and the second target channel signal is output to a second speaker. The display device 200 may superimpose the original signal of the left channel and the reverse signal of the right channel, superimpose the original signal of the right channel and the reverse phase signal of the left channel, eliminate crosstalk signals in the left channel signal and the right channel signal, generate a target sound signal without crosstalk, improve the definition and accuracy of sound, and solve the problem of low accuracy of sound output by the speaker.

Based on the above display device 200, some embodiments of the present application also provide a method for preventing crosstalk of sound. Fig. 12 is a flowchart of a method for preventing acoustic crosstalk according to some embodiments of the present application, as shown in fig. 12, where in some embodiments, the method for preventing acoustic crosstalk may include the following:

step S1: acquiring a first initial channel signal and a second initial channel signal from an audio source of the audio-video media asset;

step S2: generating a first reverse phase signal of the first initial channel signal and generating a second reverse phase signal of the second initial channel signal;

Step S3: superimposing the first initial channel signal and the second reverse phase signal to generate a first target channel signal, and superimposing the second initial channel signal and the first reverse phase signal to generate a second target channel signal;

Step S4: the first target channel signal is output to a first speaker and the second target channel signal is output to a second speaker.

As can be seen from the above technical solutions, the above embodiments provide a method for preventing crosstalk of sound, where the method can superimpose an initial signal of a left channel and a reverse signal of a right channel, superimpose an initial signal of the right channel and a reverse phase signal of the left channel, eliminate crosstalk signals in the left channel signal and the right channel signal, generate a target sound signal without crosstalk, improve the definition and accuracy of sound, and solve the problem of low accuracy of sound output by a speaker.

The same and similar parts of the embodiments in this specification are referred to each other, and are not described herein.

It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied essentially or in parts contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of the embodiments or some parts of the embodiments of the present invention.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. The illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1.A display device, characterized by comprising:

a display configured to display a user interface;

an audio output interface configured to connect the first speaker and the second speaker;

a controller configured to:

acquiring a first initial channel signal and a second initial channel signal from an audio source of the audio-video media asset;

Generating a first reverse phase signal of the first initial acoustic signal and generating a second reverse phase signal of the second initial channel signal;

2. The display device of claim 1, wherein the controller performs acquiring a first initial channel signal and a second initial channel signal in an audio source of the audio-visual asset, further configured to:

Acquiring a frame synchronization signal in the audio data channel;

detecting a signal state of the frame synchronization signal;

3. The display device according to claim 2, wherein a first reverse phase signal of the first initial sound signal is generated by a phase inversion circuit, and a second reverse phase signal of the second initial channel signal is generated; the phase inversion circuit includes an operational amplifier.

4. The display device of claim 3, wherein the controller executing the first reverse phase signal that generates the first initial channel signal is further configured to:

acquiring a first phase of the first initial channel signal;

Inputting the first phase to an operational amplifier;

5. The display device of claim 2, wherein the controller is further configured to:

Monitoring a spacing between the first speaker and the second speaker;

6. The display device of claim 5, wherein the controller is further configured to:

7. The display device of claim 6, wherein the controller is further configured to:

Acquiring the audio tuning coefficient;

8. The display device of claim 7, wherein the controller performs superposition of the first initial channel signal and the second reverse phase signal to generate a first target channel signal, further configured to:

9. The display device of claim 7, wherein the controller performs superposition of the second initial channel signal and the first reverse phase signal to generate a second target channel signal, further configured to:

10. A method of preventing acoustic crosstalk applied to the display device of any of claims 1-9, the display device comprising a display, an audio output interface, and a controller, the method of preventing acoustic crosstalk comprising: