Display device

According to an embodiment of the present disclosure, a display device includes a microphone, a wake-up word recognition unit configured to determine whether a voice wake-up word received through the microphone is recognized, and a main processor configured to, when recognition of the voice wake-up word is successful in the wake-up word recognition unit, determine whether the voice wake-up word is a normal wake-up word based on feature information of the voice wake-up word, and, when it is determined that the voice wake-up word is the normal wake-up word, perform a function corresponding to a received speech command as the speech command is received through the microphone.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is the National Phase of PCT/KR2018/015684 filed on Dec. 11, 2018, which is hereby expressly incorporated by reference into the present application.

TECHNICAL FIELD

The present disclosure relates to a display device, and more specifically, to a display device capable of performing speech recognition.

BACKGROUND ART

Digital TV services using wired or wireless communication networks are becoming more common. The digital TV services can provide a variety of services that could not be provided by conventional analog broadcasting services.

For example, IPTV (Internet Protocol Television) and smart TV services, which are types of digital TV services, provide interactive interfaces that enable users to actively select a type of a viewing program and a viewing time. IPTV and smart TV services may provide various additional services, such as Internet search, home shopping, and online games, based on the interactive interface.

In addition, recently, a speech recognition service for recognizing a user's speech through a TV and performing a function corresponding to the recognized speech has been provided.

Therefore, speech recognition through a TV intuitively causes user discomfort than other products when false recognition occurs due to environmental noise or conversations of other people while using the TV.

Since speech misrecognition may lead to unwanted operations such as TV On/Off, reservation function, and channel switching, a method to verify the misrecognition is necessary.

DISCLOSURE

Technical Problem

An object of the present disclosure is to prevent speech from being misrecognized, contrary to a user's intention, when providing a remote speech recognition service through a TV.

Technical Solution

A display device according to an embodiment of the present disclosure may perform verification for recognition of a voice wake-up word by dividing a process of recognizing the voice wake-up word into two steps.

The display device according to an embodiment of the present disclosure verifies a voice wake-up word by determining whether the voice wake-up word falls within a range of a normal wake-up word using feature information of the voice wake-up word when the recognition of the voice wake-up word is successful.

Advantageous Effects

According to various embodiments of the present disclosure, a similar spoken word is distinguished by a method of verifying a voice wake-up word, so that a user can have confidence in the operation of a TV according to the wake-up word.

In addition, it is possible to prevent unwanted TV operations from being performed by discriminating frequently occurring noise that can be recognized as a wake-up word, thereby eliminating user discomfort.

MODE FOR INVENTION

Hereinafter, embodiments relating to the present disclosure will be described in detail with reference to the accompanying drawings. The suffixes “module” and “unit” for components used in the description below are assigned or mixed in consideration of easiness in writing the specification and do not have distinctive meanings or roles by themselves.

A display device according to an embodiment of the present disclosure, for example, as an artificial display device that adds a computer supporting function to a broadcast receiving function, can have an easy-to-use interface such as a writing input device, a touch screen, or a spatial remote control device as an Internet function is added while fulfilling the broadcast receiving function. Then, with the support of a wired or wireless Internet function, it is possible to perform an e-mail, web browsing, banking, or game function in access to Internet and computers. In order to perform such various functions, standardized general purpose OS can be used.

Accordingly, since various applications are freely added or deleted on a general purpose OS kernel, a display device described herein, for example, can perform various user-friendly functions. The display device, in more detail, can be a network TV, Hybrid Broadcast Broadband TV (HBBTV), smart TV, light-emitting diode (LED) TV, organic light-emitting diode (OLED) TV, and so on and in some cases, can be applied to a smartphone.

FIG.1is a block diagram illustrating a configuration of a display device according to an embodiment of the present disclosure.

Referring toFIG.1, a display device100can include a broadcast reception unit130, an external device interface unit135, a storage unit140, a user interface unit150, a control unit170, a wireless communication unit173, a display unit180, an audio output unit185, and a power supply unit190.

The broadcast reception unit130can include a tuner131, a demodulation unit132, and a network interface unit133.

The tuner131can select a specific broadcast channel according to a channel selection command. The tuner131can receive broadcast signals for the selected specific broadcast channel.

The demodulation unit132can divide the received broadcast signals into video signals, audio signals, and broadcast program related data signals and restore the divided video signals, audio signals, and data signals to an output available form.

The external device interface unit135can receive an application or an application list in an adjacent external device and deliver it to the control unit170or the storage unit140.

The external device interface unit135can provide a connection path between the display device100and an external device. The external device interface unit135can receive at least one an image or audio output from an external device that is wirelessly or wiredly connected to the display device100and deliver it to the control unit170. The external device interface unit135can include a plurality of external input terminals. The plurality of external input terminals can include an RGB terminal, at least one High Definition Multimedia Interface (HDMI) terminal, and a component terminal.

An image signal of an external device input through the external device interface unit135can be output through the display unit180. A sound signal of an external device input through the external device interface unit135can be output through the audio output unit185.

An external device connectable to the external device interface unit135can be one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB Memory, and a home theater system, but this is just exemplary.

The network interface unit133can provide an interface for connecting the display device100to a wired/wireless network including the Internet network. The network interface unit133can transmit or receive data to or from another user or another electronic device through an accessed network or another network linked to the accessed network.

Additionally, some content data stored in the display device100can be transmitted to a user or an electronic device, which is selected from other users or other electronic devices pre-registered in the display device100.

The network interface unit133can access a predetermined webpage through an accessed network or another network linked to the accessed network. That is, the network interface unit133can transmit or receive data to or from a corresponding server by accessing a predetermined webpage through the network.

Then, the network interface unit133can receive contents or data provided from a content provider or a network operator. That is, the network interface unit133can receive contents such as movies, advertisements, games, VODs, and broadcast signals, which are provided from a content provider or a network provider, through network and information relating thereto.

Additionally, the network interface unit133can receive firmware update information and update files provided from a network operator and transmit data to an Internet or content provider or a network operator.

The network interface unit133can select and receive a desired application among applications open to the air, through network.

The storage unit140can store signal-processed image, voice, or data signals stored by a program in order for each signal processing and control in the control unit170.

Additionally, the storage unit140can perform a function for temporarily storing image, voice, or data signals output from the external device interface unit135or the network interface unit133and can store information on a predetermined image through a channel memory function.

The storage unit140can store an application or an application list input from the external device interface unit135or the network interface unit133.

The display device100can play content files (for example, video files, still image files, music files, document files, application files, and so on) stored in the storage unit140and provide them to a user.

The user interface unit150can deliver signals input by a user to the control unit170or deliver signals from the control unit170to a user. For example, the user interface unit150can receive or process control signals such as power on/off, channel selection, and screen setting from the remote control device200or transmit control signals from the control unit170to the remote control device200according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF), and IR.

Additionally, the user interface unit150can deliver, to the control unit170, control signals input from local keys (not shown) such as a power key, a channel key, a volume key, and a setting key.

Image signals that are image-processed in the control unit170can be input to the display unit180and displayed as an image corresponding to corresponding image signals. Additionally, image signals that are image-processed in the control unit170can be input to an external output device through the external device interface unit135.

Voice signals processed in the control unit170can be output to the audio output unit185. Additionally, voice signals processed in the control unit170can be input to an external output device through the external device interface unit135.

Besides that, the control unit170can control overall operations in the display device100. Additionally, the control unit170can control the display device100by a user command or internal program input through the user interface unit150and download a desired application or application list into the display device100in access to network.

The control unit170can output channel information selected by a user together with processed image or voice signals through the display unit180or the audio output unit185.

Additionally, according to an external device image playback command received through the user interface unit150, the control unit170can output image signals or voice signals of an external device such as a camera or a camcorder, which are input through the external device interface unit135, through the display unit180or the audio output unit185.

Moreover, the control unit170can control the display unit180to display images and control broadcast images input through the tuner131, external input images input through the external device interface unit135, images input through the network interface unit, or images stored in the storage unit140to be displayed on the display unit180. In this case, an image displayed on the display unit180can be a still image or video and also can be a 2D image or a 3D image.

Additionally, the control unit170can play content stored in the display device100, received broadcast content, and external input content input from the outside, and the content can be in various formats such as broadcast images, external input images, audio files, still images, accessed web screens, and document files.

Moreover, the wireless communication unit173can perform a wired or wireless communication with an external electronic device. The wireless communication unit173can perform short-range communication with an external device. For this, the wireless communication unit173can support short-range communication by using at least one of Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, and Wireless Universal Serial Bus (USB) technologies. The wireless communication unit173can support wireless communication between the display device100and a wireless communication system, between the display device100and another display device100, or between networks including the display device100and another display device100(or an external server) through wireless area networks. The wireless area networks can be wireless personal area networks.

Herein, the other display device100can be a mobile terminal such as a wearable device (for example, a smart watch, a smart glass, and a head mounted display (HMD)) or a smartphone, which is capable of exchanging data (or inter-working) with the display device100. The wireless communication unit173can detect (or recognize) a communicable wearable device around the display device100. Furthermore, if the detected wearable device is a device authenticated to communicate with the display device100, the control unit170can transmit at least part of data processed in the display device100to the wearable device through the wireless communication unit173. Accordingly, a user of the wearable device can use the data processed in the display device100through the wearable device.

The display unit180can convert image signals, data signals, or on-screen display (OSD) signals, which are processed in the control unit170, or images signals or data signals, which are received in the external device interface unit135, into R, G, and B signals to generate driving signals.

Furthermore, the display device100shown inFIG.1is just one embodiment of the present disclosure and thus, some of the components shown can be integrated, added, or omitted according to the specification of the actually implemented display device100.

That is, if necessary, two or more components can be integrated into one component or one component can be divided into two or more components and configured. Additionally, a function performed by each block is to describe an embodiment of the present disclosure and its specific operation or device does not limit the scope of the present disclosure.

According to another embodiment of the present disclosure, unlikeFIG.1, the display device100can receive images through the network interface unit133or the external device interface unit135and play them without including the tuner131and the demodulation unit132.

For example, the display device100can be divided into an image processing device such as a set-top box for receiving broadcast signals or contents according to various network services and a content playback device for playing contents input from the image processing device.

In this case, an operating method of a display device according to an embodiment of the present disclosure described below can be performed by one of the display device described with reference toFIG.1, an image processing device such as the separated set-top box, and a content playback device including the display unit180and the audio output unit185.

Then, referring toFIGS.2and3, a remote control device is described according to an embodiment of the present disclosure.

FIG.2is a block diagram illustrating a remote control device according to an embodiment of the present disclosure andFIG.3is a view illustrating an actual configuration of a remote control device according to an embodiment of the present disclosure.

First, referring toFIG.2, a remote control device200can include a fingerprint recognition unit210, a wireless communication unit220, a user input unit230, a sensor unit240, an output unit250, a power supply unit260, a storage unit270, a control unit280, and a sound acquisition unit290.

Referring toFIG.2, the wireless communication unit220transmits/receives signals to/from an arbitrary any one of display devices according to the above-mentioned embodiments of the present disclosure.

The remote control device200can include a radio frequency (RF) module221for transmitting/receiving signals to/from the display device100according to the RF communication standards and an IR module223for transmitting/receiving signals to/from the display device100according to the IR communication standards. Additionally, the remote control device200can include a Bluetooth module225for transmitting/receiving signals to/from the display device100according to the Bluetooth communication standards. Additionally, the remote control device200can include a Near Field Communication (NFC) module227for transmitting/receiving signals to/from the display device100according to the NFC communication standards and a WLAN module229for transmitting/receiving signals to/from the display device100according to the Wireless LAN (WLAN) communication standards.

Additionally, the remote control device200can transmit signals containing information on a movement of the remote control device200to the display device100through the wireless communication unit220.

Moreover, the remote control device200can receive signals transmitted from the display device100through the RF module221and if necessary, can transmit a command on power on/off, channel change, and volume change to the display device100through the IR module223.

The user input unit230can be configured with a keypad button, a touch pad, or a touch screen. A user can manipulate the user input unit230to input a command relating to the display device100to the remote control device200. If the user input unit230includes a hard key button, a user can input a command relating to the display device100to the remote control device200through the push operation of the hard key button. This will be described with reference toFIG.3.

Referring toFIG.3, the remote control device200can include a plurality of buttons. The plurality of buttons can include a fingerprint recognition button212, a power button231, a home button232, a live button233, an external input button234, a voice adjustment button235, a voice recognition button236, a channel change button237, a check button238, and a back button239.

The fingerprint recognition button212can be a button for recognizing a user's fingerprint. According to an embodiment of the present disclosure, the fingerprint recognition button212can perform a push operation and receive a push operation and a fingerprint recognition operation. The power button231can be button for turning on/off the power of the display device100. The home button232can be a button for moving to the home screen of the display device100. The live button233can be a button for displaying live broadcast programs. The external input button234can be a button for receiving an external input connected to the display device100. The voice adjustment button235can be a button for adjusting the size of a volume output from the display device100. The voice recognition button236can be a button for receiving user's voice and recognizing the received voice. The channel change button237can be a button for receiving broadcast signals of a specific broadcast channel. The check button238can be a button for selecting a specific function and the back button239can be a button for returning to a previous screen.

Again, referring toFIG.2, if the user input unit230includes a touch screen, a user can touch a soft key of the touch screen to input a command relating to the display device100to the remote control device200. Additionally, the user input unit230can include various kinds of input means manipulated by a user, for example, a scroll key and a jog key, and this embodiment does not limit the scope of the present disclosure.

The sensor unit240can include a gyro sensor241or an acceleration sensor243and the gyro sensor241can sense information on a movement of the remote control device200.

For example, the gyro sensor241can sense information on an operation of the remote control device200on the basis of x, y, and z axes and the acceleration sensor243can sense information on a movement speed of the remote control device200. Moreover, the remote control device200can further include a distance measurement sensor and sense a distance with respect to the display unit180of the display device100.

The output unit250can output image or voice signals in response to manipulation of the user input unit230or image or voice signals corresponding to signals transmitted from the display device100. A user can recognize whether the user input unit230is manipulated or the display device100is controlled through the output unit250.

For example, the output unit250can include an LED module251for flashing, a vibration module253for generating vibration, a sound output module255for outputting sound, or a display module257for outputting an image, if the user input unit230is manipulated or signals are transmitted/received to/from the display device100through the wireless communication unit220.

Additionally, the power supply unit260supplies power to the remote control device200and if the remote control device200does not move for a predetermined time, stops the power supply, so that power waste can be reduced. The power supply unit260can resume the power supply if a predetermined key provided at the remote control device200is manipulated.

The storage unit270can store various kinds of programs and application data necessary for control or operation of the remote control device200. If the remote control device200transmits/receives signals wirelessly through the display device100and the RF module221, the remote control device200and the display device100transmits/receives signals through a predetermined frequency band.

The control unit280of the remote control device200can store, in the storage unit270, information on a frequency band for transmitting/receiving signals to/from the display device100paired with the remote control device200and refer to it.

The control unit280controls general matters relating to control of the remote control device200. The control unit280can transmit a signal corresponding to a predetermined key manipulation of the user input unit230or a signal corresponding to movement of the remote control device200sensed by the sensor unit240to the display device100through the wireless communication unit220.

Additionally, the sound acquisition unit290of the remote control device200can obtain voice. The sound acquisition unit290can include at least one microphone and obtain voice through the microphone291.

FIG.4is a view of utilizing a remote control device according to an embodiment of the present disclosure.FIG.4(a)illustrates that a pointer205corresponding to the remote control device200is displayed on the display unit180.

A user can move or rotate the remote control device200vertically or horizontally. The pointer205displayed on the display unit180of the display device100corresponds to a movement of the remote control device200. Since the corresponding pointer205is moved and displayed according to a movement on a 3D space as show in the drawing, the remote control device200can be referred to as a spatial remote control device.

FIG.4(b)illustrates that if a user moves the remote control device200, the pointer205displayed on the display unit180of the display device100is moved to the left according to the movement of the remote control device200.

Information on a movement of the remote control device200detected through a sensor of the remote control device200is transmitted to the display device100. The display device100can calculate the coordinates of the pointer205from the information on the movement of the remote control device200. The display device100can display the pointer205to match the calculated coordinates.

FIG.4(c)illustrates that while a specific button in the remote control device200is pressed, a user moves the remote control device200away from the display unit180. Thus, a selection area in the display unit180corresponding to the pointer205can be zoomed in and displayed larger.

On the other hand, if a user moves the remote control device200close to the display unit180, a selection area in the display unit180corresponding to the pointer205can be zoomed out and displayed in a reduced size.

On the other hand, if the remote control device200is moved away from the display unit180, a selection area can be zoomed out and if the remote control device200is moved closer to the display unit180, a selection area can be zoomed in.

Additionally, if a specific button in the remote control device200is pressed, recognition of a vertical or horizontal movement can be excluded. That is, if the remote control device200is moved away from or closer to the display unit180, the up, down, left, or right movement cannot be recognized and only the back and forth movement can be recognized. While a specific button in the remote control device200is not pressed, only the pointer205is moved according to the up, down, left or right movement of the remote control device200.

Moreover, the moving speed or moving direction of the pointer205can correspond to the moving speed or moving direction of the remote control device200.

Furthermore, a pointer in this specification means an object displayed on the display unit180in response to an operation of the remote control device200. Accordingly, besides an arrow form displayed as the pointer205in the drawing, various forms of objects are possible. For example, the above concept includes a point, a cursor, a prompt, and a thick outline. Then, the pointer205can be displayed in correspondence to one point of a horizontal axis and a vertical axis on the display unit180and also can be displayed in correspondence to a plurality of points such as a line and a surface.

A method of operating a display device according to an embodiment of the present disclosure will be described below with reference toFIG.5.

FIG.5is a flowchart for describing a method of operating a display device according to an embodiment of the present disclosure.

Referring toFIG.5, the control unit170of the display device100receives a voice wake-up word uttered by a user (S501).

In an embodiment, the control unit170may receive the voice wake-up word through a microphone provided in the display device100.

In another embodiment, the control unit170may receive a voice wake-up word uttered by a user from an external device through the wireless communication unit173.

Here, the external device may be any one of a cradle such as a USB memory or the remote control device200shown inFIG.2.

The external device may receive the user's voice wake-up word and transmit the received voice wake-up word to the display device100through a short-range wireless communication standard.

The control unit170determines whether the recognition of the received voice wake-up word is successful (S503).

The control unit170may perform pre-processing on speech data corresponding to the received voice wake-up word. The pre-processing may include removing noise from a speech signal.

In an embodiment, the control unit170may convert the voice wake-up word into a text using an STT engine, and determine whether the converted text matches a text corresponding to a pre-stored wake-up word.

In an embodiment, when the voice wake-up word is successfully recognized, the control unit170may output a high signal through a general purpose input output (GPIO) port.

The display device100may include a separate hardware element for recognizing a voice wake-up word. The separate hardware for recognizing the voice wake-up word may be included in the control unit170or may be implemented as a separate component from the control unit170. Details will be described later.

Meanwhile, the recognition of the voice wake-up word may be performed in an external device. When the voice wake-up word is recognized by the external device, the control unit170may receive speech data corresponding to the recognized voice wake-up word from the external device.

Details will be described with reference to the drawings.

FIGS.6and7are diagrams for describing an example in which a display device directly receives and recognizes a voice wake-up word according to an embodiment of the present disclosure.

FIGS.8and9are diagrams for describing an example in which an external device receives and recognizes a voice wake-up word and transmits speech data corresponding to the recognized voice wake-up word to a display device according to another embodiment of the present disclosure.

First, description will be given with reference toFIGS.6and7.

Referring toFIGS.6and7, the microphone151of the display device100may receive a voice wake-up word600uttered by a user. The voice wake-up word600may be a command for activating a speech recognition mode of the display device100.

Hereinafter, it is assumed that the voice wake-up word600is <Hi, LG>.

A wake-up word recognition unit171of the display device100may receive speech data corresponding to the voice wake-up word through the microphone151.

The wake-up word recognition unit171may remove noise from the speech data and convert the speech data from which the noise has been removed into text data using an STT engine. The wake-up word recognition unit171may determine whether the converted text data matches text data corresponding to a previously-stored wake-up word.

When the converted text data matches the text data corresponding to the previously-stored wake-up word, the wake-up word recognition unit171may determine that the recognition of the voice wake-up word has been successful.

When the converted text data does not match the text data corresponding to the previously-stored wake-up word, the wake-up word recognition unit171may determine that the recognition of the voice wake-up word has failed.

When the recognition of the voice wake-up word is successful, the wake-up word recognition unit171may transmit the speech data of the recognized voice wake-up word to the main processor172.

The wake-up word recognition unit171may output a high signal through a GPIO port when the voice wake-up word is successfully recognized.

The main processor172may identify that the recognition of the voice wake-up word is successful through a high signal outputted. That is, the GPIO high signal may be a signal indicating that the recognition of the voice wake-up word is successful.

Meanwhile, the wake-up word recognition unit171and the main processor172may be included in the control unit170. As another example, only the main processor172may be included in the control unit170, and the wake-up word recognition unit171may exist as a separate hardware component (chip).

Description will be given with reference toFIGS.8and9.

Referring toFIGS.8and9, a cradle600may receive the voice wake-up word600uttered by a user.

The cradle800may include a microphone801, a wake-up word recognition unit803, a wireless communication unit805, and a processor807.

The microphone801of the cradle800may receive a user's voice wake-up word and transmit the received speech data of the voice wake-up word to the wake-up word recognition unit803.

The wake-up word recognition unit803may convert the speech data of the voice wake-up word into text data, and determine whether the converted text data matches pre-stored text data.

When the converted text data matches the previously-stored text data, the wake-up word recognition unit171may determine that the recognition of the voice wake-up word has been successful.

The wake-up word recognition unit803may transmit the speech data of the voice wake-up word that has been recognized successfully to the wireless communication unit805.

The wireless communication unit805may transmit the speech data of the voice wake-up word that has been recognized successfully to the wireless communication unit173of the display device100.

The wireless communication unit805may transmit the speech data to the display device100through a short-range wireless communication standard. To this end, the wireless communication unit805may include a Bluetooth module, a Wi-Fi module, or the like.

Meanwhile, the cradle800may transmit, to the display device100, wake-up word recognition information indicating that the recognition of the voice wake-up word is successful, in addition to the speech data of the voice wake-up word that has been recognized successfully.

The processor807of the cradle800may generally control components of the cradle800.

The processor807of the cradle800may transmit, to the display device100, the speech data corresponding to the user's speech command additionally received after successful recognition of the voice wake-up word.

According to the embodiment ofFIGS.8and9, even when a microphone is not provided in the display device100, a voice wake-up word and a speech command can be received through an external device, thus reducing the production cost of the display device100and burdens on the chip design.

Description will be given referring again toFIG.5.

When the recognition of the received voice wake-up word is successful, the control unit170determines whether the recognized voice wake-up word is a normal wake-up word (S505).

In an embodiment, the control unit170may verify whether the recognized voice wake-up word is a normal wake-up word.

The control unit170may determine whether the voice wake-up word is a normal wake-up word based on speech features of the recognized voice wake-up word.

Hereinafter, a process of determining whether the voice wake-up word is a normal wake-up word will be described in detail.

FIG.10is a diagram for describing a process of verifying whether a recognized voice wake-up word is a normal wake-up word according to an embodiment of the present disclosure.

In particular,FIG.10is a diagram specifically describing step S503.

The control unit170pre-processes speech data corresponding to a recognized voice wake-up word (S1001).

In an embodiment, the control unit170may perform pre-processing such as decoding, normalization processing, and noise removal on the speech data.

The pre-processing may also include a process of converting a speech signal on a time axis into a power spectrum on a frequency axis.

The control unit170extracts a plurality of speech feature vectors from the preprocessed speech data (S1003).

In an embodiment, the control unit170may divide the preprocessed speech data into a plurality of time units and extract a speech feature vector corresponding to each time unit.

The speech feature vector may be a vector representing speech features in a corresponding time unit.

The speech feature vector may have a dimension corresponding to the number of speech features.

The control unit170obtains phonemes respectively corresponding to the plurality of speech feature vectors by using an acoustic model (S1005).

The acoustic model may be a model in which phonemes corresponding to values of the speech feature vectors are stored in correspondence with each other.

The control unit170may search for the phonemes corresponding to the values of the plurality of speech feature vectors using the acoustic model.

The control unit170may obtain a plurality of phonemes respectively corresponding to the plurality of speech feature vectors according to the search result.

The control unit170determines whether a combination of obtained phonemes falls within a range to be recognized as a normal wake-up word (S1007).

The control unit170may determine whether the combination of phonemes falls within a recognition range of the normal wake-up word.

When the combination of obtained phonemes falls within the range to be recognized as a normal wake-up word, the control unit170determines the voice wake-up word as a normal wake-up word (S1009).

When the combination of obtained phonemes does not fall within the range to be recognized as a normal wake-up word, the control unit170determines the voice wake-up word as an abnormal wake-up word (S1011).

Steps S1005to S1011will be described in detail with reference toFIG.11.

FIG.11is a diagram for describing a process of determining whether or not a voice wake-up word falls within a range of a normal wake-up word based on an acoustic model and a language model.

First, the control unit170may extract speech feature vectors from a speech signal corresponding to a voice wake-up word.

The control unit170may convert the speech signal of the voice wake-up word into a power spectrum through Fast Fourier Transform (FFT) transformation.

The control unit170may extract a speech feature vector from the power spectrum at unit time intervals.

The speech feature vector may be a vector representing speech features corresponding to unit time intervals. The speech features may include one or more of a frequency band and a magnitude of an amplitude in the frequency band.

The control unit170may convert speech feature vectors into a combination of phonemes using the acoustic model1110.

The acoustic model1110may store a correspondence relationship in which phonemes corresponding to the values of the speech feature vectors matches the speech feature vectors.

The control unit170may search the acoustic model1110to obtain a phoneme matching the speech feature vector.

A first phoneme combination1121is <ha.i.el.j-i>, a second phoneme combination1123is <ha.jel.j-i>, and a third phoneme combination1125is <ha.h6el-i>.

The control unit170may obtain a Hangul text matching each phoneme combination using the language model1130.

The language model1130may be a model for converting letters of a first language constituting a phoneme combination into letters of a second language.

The control unit170may convert the phoneme group1120into a language text group1150using the language model1130.

Specifically, the control unit170may convert the first phoneme combination1121into a first language text1151(Haielji) using the language model1130.

Likewise, the control unit170may convert the second phoneme combination1123into a second language text1153(Haielji) and the third phoneme combination1125into a third language text1155, respectively.

Each of the acoustic model1110and the language model1130may have different languages depending on countries in which the display device100is used.

The control unit170may determine whether each converted language text falls within a range of a normal wake-up word.

The control unit170may determine whether the language text falls within the range of the normal wake-up word through comparison between registered normal wake-up words previously stored and the converted language text.

When the converted language text is included in the registered normal wake-up words previously stored, the control unit170may determine that the corresponding language text falls within the range of the normal wake-up words.

For example, when a first language text1151and a second language text1153correspond to the previously registered normal wake-up words, the control unit170may determine the voice wake-up word that is the basis of the first language text1151and the second language text1153as normal wake-up words. That is, in this case, the control unit170may determine that the verification of the voice wake-up word is successful.

When the third language text1155does not correspond to a previously registered normal wake-up word, the control unit170may determine the third language text1155as an abnormal wake-up word.

Description will be given referring again toFIG.5.

When it is determined that the recognized voice wake-up word is a normal wake-up word, the control unit170waits for reception of a speech command (S507).

The main processor172may output a low signal through a GPIO port when the voice wake-up word is verified as a normal wake-up word. The output low signal may be transmitted to the wake-up word recognition unit171.

Thereafter, the control unit170receives a speech command (S509) and performs a function of the display device100corresponding to the received speech command (S511).

After successful verification of the voice wake-up word, the received speech command may be a command for performing a specific function.

For example, the speech command may be a command indicating execution of a specific application installed in the display device100or may be, for example, a channel change command or a volume control command.

The control unit170may convert the received speech command into a text, determine a user's intention using the converted text, and perform a function corresponding to the speech command according to the determined user's intention.

In order to determine the user's intention, a known natural language processing technique may be used.

In step S509, when a microphone is provided in the display device100, the speech command may receive a speech command through the microphone.

When the display device100does not include a microphone, the display device100may receive a speech command from the cradle800.

The cradle800may receive a speech command through the microphone801and transmit the received speech command to the display device100through a wireless communication unit805.

On the other hand, when it is determined that the recognized voice wake-up word is not a normal wake-up word (S505), the control unit170stores the recognized voice wake-up word in the storage unit140(S513).

In an embodiment, in a case where the recognized voice wake-up word is not a normal wake-up word, when the same voice wake-up word is received later, the control unit170may store the corresponding voice wake-up word to prevent misrecognition. Accordingly, the control unit170may not activate a speech recognition mode when an abnormal wake-up word is received again.

In addition, the control unit170outputs a notification informing that the recognized voice wake-up word is an abnormal wake-up word (S515).

For example, the control unit170may display the notification indicating that the recognized voice wake-up word is an abnormal wake-up word through the display unit180.

As another example, the control unit170may output a notification indicating that the recognized voice wake-up word is an abnormal wake-up word through the audio output unit185.

FIG.12is a ladder diagram for describing a method of operating a speech recognition system according to an embodiment of the present disclosure.

In particular,FIG.12is a diagram for describing an example in which the display device100recognizes a voice wake-up word and a server1100verifies whether a voice wake-up word is a normal wake-up word.

The control unit170of the display device100receives a voice wake-up word uttered by a user (S1201).

The detailed description of step S1201is replaced with the description of step S501ofFIG.5.

The control unit170of the display device100determines whether the recognition of the received voice wake-up word is successful (S1203).

The detailed description of step S1203is replaced with the description of step S503ofFIG.5.

When the recognition of the voice wake-up word is successful, the control unit170of the display device100transmits the speech data of the voice wake-up word to the server1200through the network interface unit133(S1205).

The control unit170may transmit the speech data of the voice wake-up word to the server1200to verify whether the voice wake-up word is misrecognized.

The server1200determines whether the voice wake-up word is a normal wake-up word based on the speech data of the voice wake-up word received from the display device100(S1207).

The server1200may determine whether the voice wake-up word is a normal wake-up word using the embodiment ofFIG.10.

When the server1200determines that the voice wake-up word is a normal wake-up word (S1209), the server1200transmits a message indicating that the voice wake-up word is a normal wake-up word to the display device100(S1211).

The display device100may determine that the voice wake-up word received in step S1201is a normal wake-up word according to the message received from the server1200. That is, the display device100may determine that the verification of the voice wake-up word has been successful.

The control unit170of the display device100activates the speech recognition mode according to the message received from the server1200and waits for reception of a speech command (S1213).

That is, the control unit170of the display device100identifies whether the voice wake-up word uttered by the user is a normal wake-up word according to the message received from the server1200, and activates the speech recognition mode capable of performing a function for the user's speech command.

The control unit170of the display device100receives a speech command uttered by a user (S1215) and performs a function of the display device100corresponding to the received speech command (S1217).

On the other hand, when it is determined that the voice wake-up word is not a normal wake-up word (S1209), the server1200stores the corresponding voice wake-up word (S1219).

The server1200may store the voice wake-up word determined as an abnormal wake-up word in a database.

The reason for this is to quickly verify whether the voice wake-up word is as abnormal wake-up word using the database when the same voice wake-up word is received later.

According to an embodiment of the present disclosure, the above-described method may be implemented as processor readable codes on a medium in which a program is recorded. Examples of the medium readable by the processor include a ROM (Read Only Memory), a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission through the Internet).

The display device described above is not limitedly applicable to the configuration and method of the above-described embodiments, and the embodiments are configured by selectively combining all or part of each of the embodiments such that various modifications can be made.