KR20160147556A - Method for operating an apparatus for displaying image - Google Patents

Abstract

According to an embodiment of the present invention, a method for operating an image display device includes: a step of receiving an audio signal including a voice signal through a microphone and an acoustic signal of a speaker; a step of determining whether an external speaker is connected; a step of analyzing the input signal of the external speaker when the external speaker is connected; a step of comparing the input signal of the external speaker with the audio signal so as to correct the tone distortion and transmission delay of the audio signal; and a step of removing the acoustic signal of the speaker based on the corrected audio signal. Thereby, the present invention performs acoustic removal for a sound bar, increases the accuracy of voice recognition, and improves user convenience.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of operating an image display apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an image display apparatus and an operation method thereof, and more particularly, to an image display apparatus and an operation method thereof that can provide a sound canceling method and an efficient speech recognition method for a sound bar.

A video display device is a device having a function of displaying an image that a user can view. The user can view the broadcast through the video display device. A video display device displays a broadcast selected by a user among broadcast signals transmitted from a broadcast station on a display. Currently, broadcasting is changing from analog broadcasting to digital broadcasting around the world.

Digital broadcasting refers to broadcasting in which digital video and audio signals are transmitted. Compared to analog broadcasting, digital broadcasting is strong against external noise and has a small data loss, is advantageous for error correction, has a high resolution, and provides a clear screen. Also, unlike analog broadcasting, digital broadcasting is capable of bidirectional service.

On the other hand, the video display device may include an audio signal processing unit for high quality audio output, or may be used in connection with an audio processing device that processes and outputs an audio signal.

In addition, research on speech recognition technology capable of recognizing and manipulating user's voice by menu selection, text input, command input, channel switching, etc. has been increasing in accordance with the diversity of functions and services of the image display apparatus.

It is an object of the present invention to provide an image display apparatus and an operation method thereof capable of performing sound removal on a sound bar.

Another object of the present invention is to provide an image display apparatus and an operation method thereof that can enhance the accuracy of speech recognition.

It is another object of the present invention to provide an image display apparatus and an operation method thereof that can be operated accurately and conveniently through a speech recognition technology and can improve the usability of the user.

A method of operating an image display apparatus according to an embodiment of the present invention includes receiving an audio signal including a sound signal and a sound signal of a speaker through a microphone (MIC), determining whether an external speaker is connected, Comparing the input signal of the external speaker with an audio signal of the external speaker to correct a sound quality distortion and a transmission delay of the audio signal; And removing the acoustic signal of the speaker.

According to the present invention, sound cancellation can be performed on the sound bar, and the accuracy of speech recognition can be enhanced.

According to the present invention, it is possible to accurately and conveniently operate through the speech recognition technology, and to improve the usability of the user.

1 is a block diagram illustrating an image display system according to an embodiment of the present invention.
2 is an internal block diagram of an image display apparatus according to an embodiment of the present invention.
3 is an example of an internal block diagram of the control unit of FIG.
FIG. 4 is a diagram showing a control method of the remote control apparatus of FIG. 2. FIG.
5 is a perspective view of a remote control device according to an embodiment of the present invention.
6 is an internal block diagram of a remote control apparatus according to an embodiment of the present invention.
7 is a flowchart illustrating an operation method of an image display apparatus according to an embodiment of the present invention.
8A to 11 are views for explaining a method of operating an image display apparatus according to an embodiment of the present invention.
FIG. 12 is a flowchart illustrating an operation method of a video display device according to an embodiment of the present invention.
13 is an example of an internal block diagram of the control unit of Fig.
FIG. 14 is a diagram for explaining a speech recognition process according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffix "module "," engine ", and "part" for components used in the following description are given merely for ease of description and do not give special significance or role in themselves . Accordingly, the terms "module "," engine ", and "part"

1 is a block diagram illustrating an image display system according to an exemplary embodiment of the present invention.

1, an image display system 10 according to an exemplary embodiment of the present invention may include an image display apparatus 100 and an external speaker, for example, a sound bar 400, 100 and the sound bar 400 may be connected by wire or wirelessly.

The video display system 10 according to an embodiment of the present invention may be a home theater system including the video display device 100 and an external speaker such as a sound bar 400 and / have.

On the other hand, the video display device 100 may be various electronic devices including display means. For example, it may include a TV, a monitor, a computer, a tablet PC, a portable terminal, and the like capable of broadcasting display.

The image display apparatus 100 according to an embodiment of the present invention can receive voice signals and recognize voice recognition for voice signals received through an embedded voice recognition engine (not shown) Can be performed.

On the other hand, the image display apparatus 100 may include a voice database for storing data used for voice recognition in the voice recognition engine or in a storage unit outside the voice recognition engine.

The voice database may include an acoustic model database and a language model database that can store an acoustic model and a language model and store an acoustic model and a language model, respectively.

The voice database may further include a pronunciation dictionary database for storing vocabularies and corresponding pronunciation symbols. According to an embodiment, the speech recognition engine may further comprise a pronunciation symbol generation module for generating a pronunciation symbol from the received text data.

The speech recognition engine processes the received voice signal, and outputs the voice recognition result data by comparing the data with data stored in the voice database. On the other hand, the video display device 100 can perform various operations such as menu selection, text input, command input, and channel switching based on the output speech recognition result data.

2 is an internal block diagram of an image display apparatus according to an embodiment of the present invention.

2, an image display apparatus 100 according to an exemplary embodiment of the present invention includes a broadcast receiving unit 105, an external device interface unit 130, a network interface unit 135, a storage unit 140, An input interface unit 150, a sensor unit (not shown), a controller 170, a display 180, and an audio output unit 185.

In addition, the image display apparatus 100 according to an embodiment of the present invention may further include a built-in microphone (MIC) (not shown).

The broadcast receiving unit 105 may include a tuner unit 110 and a demodulation unit 120. The broadcast receiving unit 105 may include a tuner unit 110 and a demodulating unit 120 so as not to include the network interface unit 135. In contrast, The tuner unit 110 and the demodulation unit 120 are not included.

The tuner unit 110 selects an RF broadcast signal corresponding to a channel selected by the user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through the antenna. Also, the selected RF broadcast signal is converted into an intermediate frequency signal, a baseband image, or a voice signal.

For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF). If the selected RF broadcast signal is an analog broadcast signal, it is converted into an analog baseband image or voice signal (CVBS / SIF). That is, the tuner unit 110 can process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS / SIF) output from the tuner unit 110 can be directly input to the controller 170.

The tuner unit 110 may receive an RF broadcast signal of a single carrier according to an Advanced Television System Committee (ATSC) scheme or an RF broadcast signal of a plurality of carriers according to a DVB (Digital Video Broadcasting) scheme.

Meanwhile, the tuner unit 110 sequentially selects RF broadcast signals of all broadcast channels stored through a channel memory function among the RF broadcast signals received through the antenna in the present invention, and sequentially selects RF broadcast signals of the intermediate frequency signal, baseband image, . ≪ / RTI >

On the other hand, the tuner unit 110 can include a plurality of tuners in order to receive broadcast signals of a plurality of channels. Alternatively, a single tuner that simultaneously receives broadcast signals of a plurality of channels is also possible.

The demodulator 120 receives the digital IF signal DIF converted by the tuner 110 and performs a demodulation operation.

The demodulation unit 120 may perform demodulation and channel decoding, and then output a stream signal TS. At this time, the stream signal may be a signal in which a video signal, a voice signal, or a data signal is multiplexed.

The stream signal output from the demodulation unit 120 may be input to the controller 170. The control unit 170 performs demultiplexing, video / audio signal processing, and the like, and then outputs an image to the display 180 and outputs audio to the audio output unit 185.

The external device interface unit 130 can transmit or receive data with the connected external device 190. [ To this end, the external device interface unit 130 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The external device interface unit 130 can be connected to an external device such as a DVD (Digital Versatile Disk), a Blu ray, a game device, a camera, a camcorder, a computer , And may perform an input / output operation with an external device.

The A / V input / output unit can receive video and audio signals from an external device. Meanwhile, the wireless communication unit can perform short-range wireless communication with other electronic devices.

The network interface unit 135 provides an interface for connecting the video display device 100 to a wired / wireless network including the Internet network. For example, the network interface unit 135 may receive content or other data from the Internet or a server provided by a content provider or a network operator via a network.

The storage unit 140 may store a program for each signal processing and control in the control unit 170 or may store the processed video, audio, or data signals.

In addition, the storage unit 140 may perform a function for temporarily storing video, audio, or data signals input to the external device interface unit 130. [ In addition, the recorded program may be stored in a transcoded form in a TS format or a predetermined format.

Meanwhile, the storage unit 140 may store and manage data used for speech recognition.

Although the storage unit 140 of FIG. 2 is provided separately from the control unit 170, the scope of the present invention is not limited thereto. The storage unit 140 may be included in the controller 170.

The user input interface unit 150 transmits a signal input by the user to the control unit 170 or a signal from the control unit 170 to the user.

(Not shown), such as a power key, a channel key, a volume key, and a set value, from the remote control apparatus 200, (Not shown) that senses a user's gesture to the control unit 170 or transmits a signal from the control unit 170 to the control unit 170 It is possible to transmit it to the sensor unit (not shown).

The control unit 170 demultiplexes the input stream or processes the demultiplexed signals through the tuner unit 110 or the demodulation unit 120 or the external device interface unit 130 to output video or audio output And generate and output a signal for output.

The video signal processed by the controller 170 may be input to the display 180 and displayed as an image corresponding to the video signal. Also, the image signal processed by the controller 170 may be input to the external output device through the external device interface unit 130.

The audio signal processed by the control unit 170 may be output to the audio output unit 185 as an audio signal. The audio signal processed by the controller 170 may be input to an external output device, for example, the sound bar 400 through the external device interface unit 130.

Although not shown in FIG. 2, the controller 170 may include a demultiplexer, an image processor, and the like. This will be described later with reference to FIG.

In addition, the control unit 170 can control the overall operation in the video display device 100. [ For example, the control unit 170 may control the tuner unit 110 to control the tuning of the RF broadcast corresponding to the channel selected by the user or the previously stored channel.

In addition, the controller 170 may control the image display apparatus 100 according to a user command or an internal program input through the user input interface unit 150.

Meanwhile, the control unit 170 may control the display 180 to display an image. At this time, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

Meanwhile, the controller 170 may generate a 3D object for a predetermined 2D object among the images displayed on the display 180, and display the 3D object. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, moving images, and text.

Such a 3D object may be processed to have a different depth than the image displayed on the display 180. [ Preferably, the 3D object may be processed to be projected relative to the image displayed on the display 180.

On the other hand, the control unit 170 can recognize the position of the user based on the image photographed from the photographing unit (not shown). For example, the distance (z-axis coordinate) between the user and the image display apparatus 100 can be grasped. In addition, the x-axis coordinate and the y-axis coordinate in the display 180 corresponding to the user position can be grasped.

Although not shown in the drawing, a channel browsing processing unit for generating a channel signal or a thumbnail image corresponding to an external input signal may be further provided. The channel browsing processing unit receives the stream signal TS output from the demodulation unit 120 or the stream signal output from the external device interface unit 130 and extracts an image from an input stream signal to generate a thumbnail image . The generated thumbnail image may be stream-decoded together with a decoded image and input to the controller 170. The control unit 170 may display a thumbnail list having a plurality of thumbnail images on the display 180 using the input thumbnail image.

At this time, the thumbnail list may be displayed in a simple view mode displayed on a partial area in a state where a predetermined image is displayed on the display 180, or in a full viewing mode displayed in most areas of the display 180. The thumbnail images in the thumbnail list can be sequentially updated.

The display 180 converts a video signal, a data signal, an OSD signal, a control signal processed by the control unit 170, a video signal, a data signal, a control signal, and the like received from the external device interface unit 130, .

The display 180 may be a PDP, an LCD, an OLED, a flexible display, or the like, and may also be capable of a 3D display.

In order to view the three-dimensional image, the display 180 may be divided into an additional display method and a single display method.

The single display method can implement a 3D image only on the display 180 without a separate additional display, for example, a glass or the like, and examples thereof include a lenticular method, a parallax barrier, and the like Various methods can be applied.

In addition, the additional display method can implement a 3D image using an additional display as a viewing device in addition to the display 180. For example, various methods such as a head mount display (HMD) type and a glasses type can be applied.

On the other hand, the glasses type can be further divided into a passive type such as a polarizing glasses type and an active type such as a shutter glass type. Also, the head mount display type can be divided into a passive type and an active type.

Meanwhile, the display 180 may be configured as a touch screen and used as an input device in addition to the output device.

The audio output unit 185 receives the signal processed by the control unit 170 and outputs it as a voice.

A photographing unit (not shown) photographs the user. The photographing unit (not shown) may be implemented by a single camera, but the present invention is not limited thereto, and may be implemented by a plurality of cameras. On the other hand, the photographing unit (not shown) may be embedded in the image display device 100 on the upper side of the display 180 or may be disposed separately. The image information photographed by the photographing unit (not shown) may be input to the control unit 170.

The control unit 170 can detect the gesture of the user based on each of the images photographed from the photographing unit (not shown) or the signals sensed from the sensor unit (not shown) or a combination thereof.

The remote control apparatus 200 transmits the user input to the user input interface unit 150. [ To this end, the remote control apparatus 200 can use Bluetooth, RF (radio frequency) communication, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, or the like. Also, the remote control apparatus 200 can receive the video, audio, or data signal output from the user input interface unit 150 and display it or output it by the remote control apparatus 200.

The remote control device 200 will be described later with reference to Figs. 4 to 6. Fig.

Meanwhile, the video display device 100 may be a digital broadcast receiver capable of receiving a fixed or mobile digital broadcast.

Meanwhile, a block diagram of the image display apparatus 100 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the image display apparatus 100 actually implemented. That is, two or more constituent elements may be combined into one constituent element, or one constituent element may be constituted by two or more constituent elements, if necessary. In addition, the functions performed in each block are intended to illustrate the embodiments of the present invention, and the specific operations and apparatuses do not limit the scope of the present invention.

2, the image display apparatus 100 does not include the tuner unit 110 and the demodulation unit 120 shown in FIG. 2, but may be a network interface unit 135 or an external device interface unit 130 to play back the content.

3 is an example of an internal block diagram of the control unit of FIG.

The control unit 170 includes a demultiplexing unit 310, an audio processing unit 315, an image processing unit 320, a processor 330, an OSD generating unit 340 A mixer 345, a frame rate conversion unit 350, And may further include a data processing unit (not shown).

The demultiplexer 310 demultiplexes the input stream. For example, when an MPEG-2 TS is input, it can be demultiplexed into video, audio, and data signals, respectively. The stream signal input to the demultiplexer 310 may be a stream signal output from the tuner 110 or the demodulator 120 or the external device interface 130.

The audio processing unit 315 in the control unit 170 receives the demultiplexed audio signal from the demultiplexing unit 310 or the audio signal directly input from the network interface unit 135 or the external device interface unit 130, Audio signal processing can be performed. To this end, the audio processing unit 315 may include various decoders.

In addition, the audio processing unit 315 may include a mixer for mixing audio signals decoded in various decoders, especially audio signals of various channels. The audio signal mixed in the mixer may be transmitted to the audio output unit 185.

In addition, the audio processing unit 315 may process a base, a treble, a volume control, or the like and perform sound field signal processing automatically.

The audio processing unit 315 can adjust at least one of gain or phase of a frequency band of an audio signal to be output.

On the other hand, the processed audio signal becomes sound output through the audio output unit 185. The audio output unit 185 may include a digital-amplifier (D-Amp) and / or a speaker.

Alternatively, the processed audio signal may be input to an external output device, for example, the sound bar 400 through the external device interface unit 130, and sounded at the sound bar 400.

The image processing unit 320 may perform image processing of the demultiplexed image signal. To this end, the image processing unit 320 may include an image decoder 225 and a scaler 235. [

The video decoder 225 decodes the demultiplexed video signal and the scaler 235 performs scaling so that the resolution of the decoded video signal can be output from the display 180.

The video decoder 225 may include a decoder of various standards.

On the other hand, the image signal decoded by the image processing unit 320 can be divided into a case where there is only a 2D image signal, a case where a 2D image signal and a 3D image signal are mixed, and a case where there is only a 3D image signal.

For example, when an external video signal input from the external device 190 or a broadcast video signal of a broadcast signal received from the tuner unit 110 includes only a 2D video signal, when a 2D video signal and a 3D video signal are mixed And a case where there is only a 3D video signal. Accordingly, the controller 170, particularly, the image processing unit 320 and the like can process the 2D video signal, the mixed video signal of the 2D video signal and the 3D video signal, , A 3D video signal can be output.

Meanwhile, the image signal decoded by the image processing unit 320 may be a 3D image signal in various formats. For example, a 3D image signal composed of a color image and a depth image, or a 3D image signal composed of a plurality of view image signals. The plurality of viewpoint image signals may include, for example, a left eye image signal and a right eye image signal.

The processor 330 may control the overall operation in the image display apparatus 100 or in the control unit 170. [ For example, the processor 330 may control the tuner 110 to select a channel selected by the user or an RF broadcast corresponding to a previously stored channel.

In addition, the processor 330 may control the image display apparatus 100 by a user command or an internal program input through the user input interface unit 150. [

In addition, the processor 330 may perform data transfer control with the network interface unit 135 or the external device interface unit 130.

In addition, the processor 330 may control the overall voice recognition function, perform voice recognition based on the voice signal input, or use the server 400 connected via the network.

The processor 330 may control operations of the demultiplexing unit 310, the audio processing unit 315, the image processing unit 320, the OSD generating unit 340, and the like in the control unit 170.

The OSD generation unit 340 generates an OSD signal according to a user input or by itself. For example, based on a user input signal, a signal for displaying various information in a graphic or text form on the screen of the display 180 can be generated. The generated OSD signal may include various data such as a user interface screen of the video display device 100, various menu screens, a widget, and an icon. In addition, the generated OSD signal may include a 2D object or a 3D object.

The OSD generating unit 340 can generate a pointer that can be displayed on the display based on the pointing signal input from the remote control device 200. [ In particular, such a pointer may be generated by a pointing signal processing unit, and the OSD generating unit 240 may include such a pointing signal processing unit (not shown). Of course, a pointing signal processing unit (not shown) may be provided separately from the OSD generating unit 240.

The mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded video signal processed by the image processor 320. At this time, the OSD signal and the decoded video signal may include at least one of a 2D signal and a 3D signal. The mixed video signal is supplied to a frame rate converter 350.

A frame rate converter (FRC) 350 can convert the frame rate of an input image. On the other hand, the frame rate converter 350 can output the frame rate without conversion.

The formatter 360 may arrange the left eye image frame and the right eye image frame of the frame rate-converted 3D image. Then, it is possible to output the synchronizing signal (Vsync) for opening the left eye glass and the right eye glass of the 3D viewing apparatus.

The formatter 360 receives the mixed signal, i.e., the OSD signal and the decoded video signal, from the mixer 345, and separates the 2D video signal and the 3D video signal.

In the present specification, a 3D video signal means a 3D object. Examples of the 3D object include a picuture in picture (PIP) image (still image or moving picture), an EPG indicating broadcasting program information, Icons, texts, objects in images, people, backgrounds, web screens (newspapers, magazines, etc.).

On the other hand, the formatter 360 can change the format of the 3D video signal.

Meanwhile, the formatter 360 may convert the 2D video signal into a 3D video signal. For example, according to a 3D image generation algorithm, an edge or a selectable object is detected in a 2D image signal, and an object or a selectable object according to the detected edge is separated into a 3D image signal and is generated . At this time, the generated 3D image signal can be separated into the left eye image signal L and the right eye image signal R, as described above.

Although not shown in the drawing, it is also possible that a 3D processor (not shown) for 3-dimensional effect signal processing is further disposed after the formatter 360. The 3D processor (not shown) can process the brightness, tint, and color of the image signal to improve the 3D effect. For example, it is possible to perform signal processing such as making the near field clear and the far field blurring. On the other hand, the functions of such a 3D processor can be merged into the formatter 360 or merged into the image processing unit 320. [

The data processing unit (not shown) in the control unit 170 can perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is a coded data signal, it can be decoded. The encoded data signal may be EPG (Electronic Program Guide) information including broadcast information such as a start time and an end time of a broadcast program broadcasted on each channel.

3 shows that the signals from the OSD generating unit 340 and the image processing unit 320 are mixed in the mixer 345 and then 3D processed in the formatter 360. However, May be located behind the formatter. That is, the output of the image processing unit 320 is 3D-processed by the formatter 360, and the OSD generating unit 340 performs 3D processing together with the OSD generation. Thereafter, the processed 3D signals are mixed by the mixer 345 It is also possible to do.

Meanwhile, the block diagram of the controller 170 shown in FIG. 3 is a block diagram for an embodiment of the present invention. Each component of the block diagram can be integrated, added, or omitted according to the specifications of the control unit 170 actually implemented.

In particular, the frame rate converter 350 and the formatter 360 are not provided in the controller 170, but may be separately provided.

FIG. 4 is a diagram showing a control method of the remote control apparatus of FIG. 2. FIG.

4A, it is exemplified that a pointer 205 corresponding to the remote control device 200 is displayed on the display 180. In the example of FIG.

The user can move or rotate the remote control device 200 up and down, left and right (Figure 5 (b)), and back and forth (Figure 5 (c)). The pointer 205 displayed on the display 180 of the video display device corresponds to the movement of the remote control device 200. [ In this remote control device 200, as shown in the figure, since the pointer 205 is moved according to the movement in the 3D space, it can be called a space remote controller.

4B illustrates that when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display 180 of the image display device also shifts to the left corresponding thereto.

Information on the motion of the remote control device 200 sensed through the sensor of the remote control device 200 is transmitted to the image display device. The image display apparatus can calculate the coordinates of the pointer 205 from the information on the motion of the remote control apparatus 200. [ The image display apparatus can display the pointer 205 so as to correspond to the calculated coordinates.

4C illustrates a case where the user moves the remote control device 200 away from the display 180 while pressing a specific button in the remote control device 200. [ Thereby, the selected area in the display 180 corresponding to the pointer 205 can be zoomed in and displayed. Conversely, when the user moves the remote control device 200 close to the display 180, the selection area within the display 180 corresponding to the pointer 205 may be zoomed out and zoomed out. On the other hand, when the remote control device 200 moves away from the display 180, the selection area is zoomed out, and when the remote control device 200 approaches the display 180, the selection area may be zoomed in.

On the other hand, when the specific button in the remote control device 200 is pressed, it is possible to exclude recognizing the up, down, left, and right movement. That is, when the remote control apparatus 200 moves away from or approaches the display 180, it is not recognized that the up, down, left, and right movements are recognized, and only the forward and backward movements are recognized. Only the pointer 205 is moved in accordance with the upward, downward, leftward, and rightward movement of the remote control device 200 in a state where the specific button in the remote control device 200 is not pressed.

On the other hand, the moving speed and moving direction of the pointer 205 may correspond to the moving speed and moving direction of the remote control device 200.

FIG. 5 is a perspective view of a remote control apparatus according to an embodiment of the present invention, and FIG. 6 is an internal block diagram of a remote control apparatus.

Referring to FIG. 5, the spatial remote controller 201 according to an embodiment of the present invention may include various input keys, input buttons, and the like.

For example, the spatial remote controller 201 may include an Okay key 291, a menu key 292, a four-way key 293, a channel adjustment key 294, and a volume adjustment key 296 have. In addition, it may further include a separate microphone (not shown).

For example, the Okay key 291 may be used to select a menu or an item, the menu key 292 may be used to display a predetermined menu, and the four directional keys 293 may be a pointer or an indicator, The channel adjustment key 294 can be used for channel up and down adjustment, and the volume adjustment key 296 can be used for volume up and down adjustment.

In addition, the spatial remote controller 201 may further include a back key 297 and a home key 298. For example, a back key 297 may be used to move to a previous screen, and a home key 298 may be used to move to a home screen.

On the other hand, as shown in the figure, the confirmation key 291 may be added with a scroll function. For this, the confirmation key 291 can be implemented as a wheel key. That is, when the OK key 291 is pressed, it is used as a menu or item selection. When the OK key 291 is scrolled up and down, a display screen scrolling or a list page switching can be performed.

Specifically, when an image larger than the size of the display is displayed on the display unit 180 and the OK key 291 is scrolled to search for the corresponding image, the image area that is not currently displayed on the display is displayed on the display. As another example, when the list page is displayed on the display unit 180, the previous page or the next page of the current page can be displayed by scrolling the OK key 291. [

This scroll function may be provided with a separate key other than the confirmation key 291. [

On the other hand, the four directional keys 293 can be arranged in four directions in the circular type, as shown in the figure, up, down, left, and right keys. Touch input to the four directional keys 293 may also be possible. For example, if there is a touch operation from the up key to the down key in the direction key 293, the set function may be inputted or performed according to the corresponding touch input.

6, the remote control device 200 includes a wireless communication unit 220, a user input unit 230, a sensor unit 240, an output unit 250, a power supply unit 260, a storage unit 270, A control unit 280, and an audio input unit 290.

The wireless communication unit 220 can transmit and receive signals to and from the video display device 100 and the wireless communication unit 211 of the user input interface unit 150, for example.

On the other hand, the coordinate value calculation unit 215 of the video display device 100 can calculate the coordinates of the pointer 205 from the information about the motion of the remote control device 200

The remote control apparatus 200 may include an RF module 221 that can transmit and receive signals to and from the RF module 212 of the image display apparatus 100 according to the RF communication standard. The remote control apparatus 200 may further include an IR module 223 capable of transmitting and receiving signals to and from the IR module 213 of the image display apparatus 100 according to the IR communication standard.

Further, the remote control device 200 may further include an NFC module (not shown) for short-range magnetic field communication with the electronic device.

The remote control device 200 can transmit a signal including information on the motion of the remote control device 200 to the image display device 100 through the RF module 221.

Also, the remote control device 200 can receive the signal transmitted by the video display device 100 through the RF module 221. [ Also, the remote control device 200 can transmit commands to the video display device 100 via the IR module 223, such as power on / off, channel change, volume change, and the like, as needed.

On the other hand, according to the present embodiment, the remote control device 200 can receive personal information by a near field communication with a predetermined electronic device.

On the other hand, the remote control device 200 can transmit the received personal information to the video display device 100. [ The communication method at this time can be an IR method or an RF method.

The user input unit 230 may include a keypad, a key (button), a touch pad, or a touch screen. The user can input a command related to the image display apparatus 100 to the remote control apparatus 200 by operating the user input unit 230. [ When the user input unit 230 has a hard key button, the user can input a command related to the image display device 100 to the remote control device 200 through the push operation of the hard key button. When the user input unit 230 includes a touch screen, the user may touch a soft key of the touch screen to input a command related to the image display apparatus 100 to the remote control apparatus 200. [ In addition, the user input unit 230 may include various types of input means such as a scroll key, a jog key, and the like that can be operated by the user, and the present invention does not limit the scope of the present invention.

The sensor unit 240 may include a gyro sensor 241 or an acceleration sensor 243. The gyro sensor 241 can sense information on the motion of the remote control device 200. [

For example, the gyro sensor 241 can sense information on the operation of the remote control device 200 based on the x, y, and z axes. The acceleration sensor 243 can sense information on the moving speed of the remote control device 200 and the like. On the other hand, it may further include a distance measuring sensor, whereby the distance to the display 180 can be sensed. Alternatively, it can detect the amount of change in orientation by including a geomagnetic sensor that can detect the direction of the magnetic field generated by the earth and detect the orientation like a compass.

The output unit 250 may output an image or voice signal corresponding to the operation of the user input unit 230 or corresponding to the signal transmitted from the image display apparatus 100. The user can recognize whether the user input unit 230 is operated or whether the image display apparatus 100 is controlled through the output unit 250.

For example, the output unit 250 includes an LED module 251 that is turned on when the user input unit 230 is operated or a signal is transmitted and received between the image display device 100 and the image display device 100 through the wireless communication unit 225, 253 for outputting sound, an acoustic output module 255 for outputting sound, or a display module 257 for outputting an image.

The power supply unit 260 supplies power to the remote control device 200. The power supply unit 260 can reduce power consumption by stopping the power supply when the remote controller 200 is not moving for a predetermined period of time. The power supply unit 260 may resume power supply when a predetermined key provided in the remote control device 200 is operated.

The storage unit 270 may store various types of programs, application data, and the like necessary for the control or operation of the remote control apparatus 200. [ When the remote control device 200 wirelessly transmits and receives a signal through the image display device 100 and the RF module 221, the remote control device 200 and the image display device 100 transmit signals through a predetermined frequency band Send and receive. The control unit 280 of the remote control device 200 stores information on the frequency band and the like capable of wirelessly transmitting and receiving signals with the video display device 100 paired with the remote control device 200 in the storage unit 270 Can be referenced.

In addition, the storage unit 270 may store IR format key codes for controlling other electronic devices as an IR signal, and may store an IR format key database of a plurality of electronic devices.

The control unit 280 controls various matters related to the control of the remote control device 200. [ The control unit 280 transmits a signal corresponding to a predetermined key operation of the user input unit 230 or a signal corresponding to the motion of the remote control device 200 sensed by the sensor unit 240, (100).

The audio input unit 290 is for an audio signal, and may include a microphone (MIC) or the like. The microphone can receive an external sound signal, for example, a user's voice signal, and process it as electrical voice data by a microphone.

The voice signal and data may be transmitted to the video display device 100 through the wireless communication unit 220. [

FIG. 7 is a flowchart illustrating an operation method of an image display apparatus according to an exemplary embodiment of the present invention. FIGS. 8A to 11 are views for explaining an operation method of an image display apparatus according to an exemplary embodiment of the present invention.

7, an operation method of an image display apparatus according to an exemplary embodiment of the present invention may receive an audio signal including a sound signal and a sound signal of a speaker through a microphone (MIC) (S710)

The microphone (MIC) can receive an audio signal including a voice signal of a user, a sound signal of a TV output through an internal speaker and / or an external speaker, and process it as electrical voice data.

Here, the microphone (MIC) may be a microphone provided in a remote control device or an image display device, or an external microphone connected through an interface part.

The remote control apparatus 200 according to an embodiment of the present invention may include an audio input unit 290 and the audio input unit 290 may be a microphone for audio signals. The microphone can receive an external sound signal, for example, a user's voice signal, and process it as electrical voice data by a microphone. The voice signal and data may be transmitted to the video display device 100 through the wireless communication unit 220. [

Alternatively, the image display apparatus 100 according to an embodiment of the present invention may include an internal microphone (MIC) to receive and process an audio signal.

Alternatively, the external microphone may be connected to the external device interface unit 130 or the network interface unit 135 to receive the processed audio signal from the external microphone.

On the other hand, the microphone (MIC) receives an analog audio signal and can convert the received analog audio signal into a digital audio signal. Alternatively, the analog audio signal received by the microphone (MIC) may be converted into a digital audio signal via a separate analog-digital converter.

Meanwhile, the digital audio signal may be a multi-channel audio signal such as SPDIF, HDMI, MADI, and ADAT.

On the other hand, not only the user's voice but also the sound of the audio outputted through the external speaker connected to the built-in speaker or the image display device is received together with the microphone (MIC), and the received audio signals can be input to the speech recognition.

Accordingly, in order to perform accurate speech recognition, an acoustic signal generated by a sound device such as a speaker must be removed from an audio signal received from a microphone.

The TV audio used as the reference signal and the audio at the microphone input used for speech recognition may be similar but not the same, so that the TV sound corresponding to the noise can not be accurately removed.

For example, some of the acoustic and / or speech signals may also be removed

Also, the audio at the microphone input may vary depending on whether the audio output is performed via an internal speaker or external speaker connected to the video display.

Therefore, it is necessary to remove the acoustic signal in the most accurate and appropriate manner to suit the situation, such as whether the audio output is performed through an internal speaker or an external speaker connected to the image display device.

The present invention determines whether an external speaker is connected to the video display device (S720), and processes the external speaker depending on whether the external speaker is connected or not. That is, a more effective sound cancellation method can be applied by selecting a reference signal to be used for removing an appropriate sound depending on whether an external speaker is connected or not.

Accordingly, it is possible to prevent malfunction due to speech recognition and improve the voice recognition rate. In addition, the sound output from the speaker is eliminated and speech recognition is performed only on the user's voice, thereby preventing malfunction of the video display device.

Meanwhile, the external speaker may be a sound bar (400).

The sound bar 400 is an audio device separated from the image display apparatus and functions as audio signal processing and audio output of the image display apparatus and can be used alone or in connection with one or more speakers to be used as a speaker system.

The sound bar 400 may be a loud speaker, and may be a loudspeaker array in which a plurality of loudspeakers are linearly connected.

The sound bar 400 can reproduce sound fields by outputting audio signals using a plurality of speakers. The sound bar 400 can be panned, wave field synthesized, beamformed, focused source, or focused sound source under the environment of a speaker system including the sound bar 400 alone ), A head related transfer function, and the like, can be used to virtually reproduce a multi-channel audio signal.

Referring to FIG. 7, it is determined whether an external speaker is connected to the video display device according to the embodiment of the present invention (S720). When the external speaker is connected, the input signal of the external speaker can be analyzed. (S730)

Here, the input signal of the external speaker may be a digitized audio signal output from the video display device to the external speaker. In addition, the digitized audio signal may be audio signals such as SPDIF, HDMI, MADI, ADAT, and the like.

The present invention can capture a digitized signal before output of a built-in speaker of a video display device or a connected external speaker, and use it as a reference signal to remove a speaker sound signal received from a microphone (MIC) have.

8A and 8B show examples of gain and frequency characteristics of a TV speaker sound (-33 dB), respectively.

9A and 9B show examples of gain and frequency characteristics of a sound bar sound (-29 dB), respectively.

8A, 8B, 9A and 9B are sound before the output of the digital amplifier (D-Amp), so that the sound and the gain and frequency characteristics of the TV speaker are different. For example, referring to the drawings, In the case of sound, it can be seen that the variation range of the high frequency is relatively large.

Since the path through which the audio signal is transmitted to the built-in speaker passes through a digital amplifier (D-Amp), it is possible to capture a signal before outputting the digital amplifier (D-Amp) Is different from the conventional TV sound capture path because it does not go through a digital amplifier (D-Amp).

Also, since the transmission path of the audio signal is different, a difference between the signal captured by the microphone (MIC) and the capture signal of the sound bar may be significantly different from the TV capture signal.

In addition, since the TV sound inputted to the microphone (MIC) may cause a delay, it is necessary to remove the generated delay.

Accordingly, the present invention can perform the input signal profiling separately according to whether external speakers are connected or not.

Compares the input signal of the external speaker with the audio signal, corrects the sound quality distortion and transmission delay of the audio signal, and removes the sound signal of the speaker based on the corrected audio signal (S740) (S750)

10 is a diagram schematically showing a delay between a microphone signal and a soundbar capture signal.

FIG. 10A shows a microphone capture signal, FIG. 10B shows a TV capture signal, and FIG. 10C shows a signal obtained by processing a transmission delay.

10 (a) and 10 (b), the microphone capture signal shows that the interval a1, which is the sum of one packet and the system time, is one packet of the TV capture signal and the system time The delay time d can be delayed by a delay time d longer than the sum a2 of the sum of the TV capture signal and the microphone signal.

Therefore, the signal a3 processed by removing the transmission delay time d from the microphone capture signal can be used as the input of speech recognition.

According to an embodiment of the present invention, a packet can be configured to include system time information when a TV sound is transmitted when a sound is transmitted to an external speaker.

In addition, a packet including the system time information can be configured when the TV sound is transmitted to the external speaker.

Accordingly, acoustic correction can be performed when actually processing Acoustic Echo Cancellation (AEC) in comparison with a micro input audio signal (sound) and a capture sound.

In addition, a header including the digital output gain of the digital audio signal and the decoding information can be configured.

Accordingly, speech recognition performance can be improved when an external speaker (sound) device is used.

Meanwhile, the correction step S740 may correct the gain and frequency characteristics of the audio signal including the audio signal and the acoustic signal of the speaker through the microphone (MIC). When the sound bar 400 is connected to the image display device TV, as described with reference to Figs. 8A, 8B, 9A and 9B, the gain increases and the fluctuation range of the high frequency is relatively large The control unit 170 and / or the audio processing unit 315 can reduce the gain of the audio signal and perform the flatness correction on the frequency characteristic.

The audio processing unit 315 can perform subband analysis filtering on the input audio signal. That is, a sub-band analysis filter bank is provided to convert an audio signal subjected to the image-localization control into a frequency signal. The subband of the filtered audio signal may be 32 subbands or 64 subbands or FFT subbands.

As described above, the audio signals classified according to frequency bands can be subjected to phase adjustment or gain adjustment for each frequency band or each frequency band group.

The audio processing unit 315 may perform at least one of phase adjustment and gain adjustment for each frequency band of the audio signal.

For this purpose, the audio processing unit 315 can adjust the gain for each frequency band separated for each band.

The gain adjustment method can be performed in various ways. For example, gain can be adjusted independently for all frequency bands, gain can be adjusted by dividing bands or bands only for specific frequency ranges, or groups can be grouped for specific frequency ranges to control gain for each group.

FIG. 11 is a view for explaining a case where the sound signal distortion of the audio signal and the transmission delay are corrected (S740) by comparing the input signal of the external speaker with the audio signal, (S750). ≪ / RTI >

That is, as a result of the sound processing according to the present invention, the output sound of the TV through the sound bar 400 and the sound are separated from the microphone signal, so that speech recognition can be performed with the user's voice signal processed as shown in FIG. 11 (S760 ) The image display apparatus can perform a corresponding operation based on the discriminated speech recognition result data.

The speech recognition step S760 may include extracting a feature vector based on the speech signal from which the acoustic signal of the speaker is removed, comparing the feature vector with the speech database, And the like. The voice recognition step (S760) will be described later with reference to Fig.

7, if the external speaker is not connected (S720), the input signal of a built-in speaker such as a digital amplifier (D-Amp) of the image display apparatus 100 is analyzed (S770 ) Comparing the input signal of the built-in speaker with the audio signal, the sound quality distortion and transmission delay of the audio signal are corrected (S780)

On the other hand, based on the corrected audio signal, the acoustic signal of the speaker can be removed (S750), and speech recognition can be performed based on the signal from which the acoustic signal of the speaker is removed (S760)

That is, according to the present invention, a reference signal to be used for removing sound may be configured differently according to a speaker for outputting a TV-side sound, thereby performing correction-acoustics removal of the audio signal.

According to the present invention, speech recognition performance can be improved even when an external audio output device such as the sound bar 400 is connected.

In addition, conventionally, there is a limit to the echo performance when using a sound bar other than a TV speaker. However, according to the present invention, voice recognition can be used regardless of the acoustic characteristics and the connection state of the external audio output device, There is an advantage that it can be utilized in a display device system.

In addition, voice recognition can be used with an external microphone (MIC) system such as a built-in microphone (MIC) and a USB microphone.

FIG. 12 is a flowchart illustrating an operation method of a video display device according to an embodiment of the present invention.

12, the image display apparatus 100 according to the embodiment of the present invention can capture a microphone signal first (S1210). In this case, the captured microphone signal is a sound signal and a sound signal of the speaker .

The image display apparatus 100 can determine whether external speakers such as the sound bar 400 are connected (S1220)

If an external speaker is not connected, the TV sound can be captured (S1230). At this time, the captured TV sound may be a digitized audio signal captured at the input terminal of the digital amplifier (D-AMP).

The video display apparatus 100 may compare the captured microphone signal with the captured TV sound to determine whether or not it is delayed (S1240)

If a delay has not occurred, the speaker side sound can be removed from the captured microphone signal using the captured TV sound as a reference signal (S1250)

If a delay has occurred, the delayed time is analyzed (S1245), the analyzed time-speech sample is converted to correct the transmission delay (S1247), and the corrected TV sound is referred to Signal to remove the speaker side sound from the captured microphone signal (S1250)

If an external speaker is connected, the sound of the external speaker such as a sound bar can be captured and a profile process for the input signal can be performed (S1235). At this time, the captured external speaker sound is input to the input terminal Lt; RTI ID = 0.0 > input audio signal.

Meanwhile, the gain and frequency characteristics of the audio signal including the audio signal and the acoustic signal of the speaker can be corrected through the microphone (MIC).

In particular, the digital output gain and signal of the external speaker sound can be converted (S1237)

When the sound bar 400 is connected to the image display device TV, as described with reference to Figs. 8A, 8B, 9A and 9B, the gain increases and the fluctuation range of the high frequency is relatively large The control unit 170 and / or the audio processing unit 315 can reduce the gain of the audio signal and perform the flatness correction on the frequency characteristic.

Since the delay is normally generated when the sound is output to the external speaker such as the sound bar 400, the delayed time is analyzed (S1245), and the analyzed time- After correction (S1247), the speaker side sound can be removed from the captured microphone signal using the corrected sound bar sound as a reference signal (S1250)

FIG. 13 is an example of an internal block diagram of the control unit of FIG. 2, and particularly shows an embodiment of the audio processing unit 315. FIG.

Referring to FIG. 13, the audio processing unit 315 can process an audio signal input from the audio input device.

The audio processing unit 315 can perform audio signal processing on an audio signal demultiplexed by the demultiplexing unit 310 or an audio signal input directly from the network interface unit 135 or the external device interface unit 130 have. To this end, the audio processing unit 315 may include various decoders.

In addition, the audio processing unit 315 may include a mixer for mixing audio signals decoded in various decoders, especially audio signals of various channels.

Meanwhile, the audio processing unit 315 may include a sound engine 1310 that performs signal processing for a sound to be output. In some embodiments, the sound engine 1310 may include the decoder, mixer, and the like.

In addition, the audio processing unit 315 may include an acoustic elimination unit 1320.

The sound eliminator 1320 may filter at least one of a gain or a phase of a frequency band of an audio signal to be filtered or a predetermined sound signal, have.

The audio processing unit 315 may include an audio DSP (Audio Digital Signal Processor) 1330 that controls the overall operation of the audio processing unit 315.

Meanwhile, the processed audio signal may be output to the internal speaker through a digital-amplifier (D-Amp) 185 or may be output to an external sound output device, for example, the sound bar 400.

The video display device 100 may be connected to the sound output device such as the sound bar 400 and the external device interface unit 130 via a wire or wireless connection so as to transmit digital signals such as SPDIF and HDMI.

According to an embodiment of the present invention, an audio signal transmitted to an external speaker such as the sound bar 400 is different from the sound field effect in the video display system, so that a transmission path before and after the sound engine 1310 can be realized.

That is, since the sound field effect of the audio signal transmitted to the external speaker such as the sound bar 400 is different from that of the existing signal, the phase difference of the signal captured due to the direction according to the position can be corrected in the multi-channel sound system configuration.

13, the path for transmitting the signal to the sound bar 400 does not pass through the D-Amp 185, so that unlike the existing TV sound capturing path captured at the input terminal of the D-Amp 185, 400 can be captured.

Meanwhile, the method of operating an image display apparatus according to an embodiment of the present invention may further include filtering a noise component of the audio signal.

FIG. 14 is a diagram for explaining a speech recognition process according to an embodiment of the present invention.

14, preprocessing such as noise processing is performed on a voice signal 1410 that is received first. (1420) In the preprocessing process, as in the case of end-point detection, only the voice interval A method of detecting a speech section and a silence section by extracting statistical features that are relatively simple to calculate from an input signal.

A commonly used method is to determine the speech interval and the silence interval by comparing the energy value (or log energy value) at every interval of the input signal and comparing it with a predetermined threshold value by statistics.

In addition, the preprocessing process may include noise processing to remove noise.

Meanwhile, the preprocessing step 1420 may further include a necessary additional noise processing and signal processing.

Then, a feature vector (parameter) effective for recognition is extracted from the inputted speech signal. (1430)

Here, a method based on LPC (Linear Predictive Coefficients) and an MFFC (Mel Frequency Cepstral Coefficients) extraction method can be used.

Thereafter, a voice signal, a pattern of the extracted characteristic parameter can be recognized, and an acoustic model 1441 can be used for pattern recognition (1440).

This is a method of modeling and comparing the signal characteristics of speech, and a direct comparison method of setting the recognition object as the feature vector model and comparing it with the feature vector of the input signal can be used. In the direct comparison method, a unit of a recognition target word, a phoneme, and the like is set as a feature vector model, and it is possible to compare how similar the input speech is.

Alternatively, a statistical method of statistically processing and using the feature vector of the recognition object can be used. This statistical method can construct the unit of the recognition target as a state sequence and use the relation between the status columns. The DTW (Dynamic Time Warping) method using the temporal arrangement relation, the probability value, And HMM (Hidden Markov Model) method.

In more detail, DTW (Dynamic Time Warping) is a method of obtaining the distance between the reference speech signal and the input speech signal using dynamic programming, and is mainly used for constructing a speaker-dependent isolated word recognition system and has a high recognition rate.

HMM (Hidden Markov Model) is a method of expressing transition probability of a negative state from one state to the next state, constructing a model representative of these from training data by using temporal statistical characteristics of a speech signal, And a probability model with a high degree of similarity is adopted as the recognition result.

Thereafter, data corresponding to the received voice signal can be discriminated and the recognition result 1960 can be output.

Meanwhile, the data discrimination process may include a language processing operation 1450 using the language model 1451.

The language model is generally used to find probability values for all possible word sequences. The grammar-based method considers only word sequences that are grammatically correct for a given situation among the possible combinations of words. From a database of uttered speech in a given situation, , A statistical-based scheme may be used that statistically estimates a probability value of a possible word sequence.

Speech recognition compares input speech with data such as stored acoustic models and language models, and outputs the most similar data as recognition result data.

For example, the embedded speech engine provided in the image display apparatus 100 extracts features of a voice signal input through a microphone or a remote control device in a vector form, and extracts the extracted feature vectors and acoustic models, It is possible to output a speech recognition result using a speech database including phonetic information such as a dictionary.

The image display apparatus 100 obtains the recognition result through comparison between the speech database and the feature vector. More specifically, the speech recognition result can be obtained by comparing the feature vector with an acoustic model for modeling and comparing the signal characteristics of speech and a language model for modeling the linguistic order relation of words or syllables corresponding to the recognition vocabulary have.

The operation method of the image display apparatus according to the embodiment of the present invention is not limited to the configuration and the method of the embodiments described above but the embodiments can be applied to all of the embodiments Or some of them may be selectively combined.

Meanwhile, the operation method of the image display apparatus of the present invention can be implemented as a code that can be read by a processor on a recording medium readable by a processor included in the image display apparatus. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored. Examples of the recording medium that can be read by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet . In addition, the processor-readable recording medium may be distributed over network-connected computer systems so that code readable by the processor in a distributed fashion can be stored and executed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Broadcast receiver: 105
External device interface part: 130
Storage: 140
User input interface part: 150
Control section: 170
Display: 180
Audio output: 185

Claims (10)

Receiving an audio signal through a microphone (MIC) and an audio signal including a sound signal of a speaker;
Determining whether an external speaker is connected or not;
Analyzing an input signal of the external speaker when the external speaker is connected;
Comparing an input signal of the external speaker with the audio signal to correct a distortion of sound quality and a transmission delay of the audio signal; And
And removing the acoustic signal of the speaker based on the corrected audio signal. The method according to claim 1,
Wherein the external speaker is a sound bar. The method according to claim 1,
Extracting a feature vector based on a speech signal from which the acoustic signal of the speaker is removed; And
And comparing the feature vector with the voice database to determine data corresponding to the received voice signal. The method of claim 3,
And performing a corresponding operation based on the discriminated data. The method according to claim 1,
Wherein the microphone (MIC) is a microphone provided in a remote control device or an image display device, or an external microphone connected through an interface part. The method according to claim 1,
Analyzing an input signal of the built-in speaker when the external speaker is not connected;
And comparing the input signal of the built-in speaker with the audio signal to correct a sound quality distortion and a transmission delay of the audio signal. The method according to claim 1,
And filtering the noise component of the audio signal. The method of claim 1, further comprising: The method according to claim 1,
Wherein the input signal of the external speaker is a digitized audio signal output from the video display device to the external speaker. The method according to claim 1,
Wherein the correcting step corrects a gain and a frequency characteristic. 10. The method of claim 9,
Wherein the correcting step reduces the gain and the frequency characteristic performs the flattening correction.

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