KR20190094852A - Display Apparatus And An Audio System which the display apparatus installed in - Google Patents

Abstract

According to an embodiment of the present invention, provided is a display device, which comprises: an audio output unit transmitting an audio signal and a marker signal of an inaudible region to an external sound output device; a sound reception unit receiving sound waves output from the external sound output device in response to the audio signal and the marker signal of the inaudible region; and a control unit calculating a delay time based on a difference between a transmission point of time of the marker signal and a reception point of time of the sound wave, and correcting the transmission point of time of the audio signal based on the calculated delay time.

Description

Display Apparatus And An Audio System which the display apparatus installed in}

The present invention relates to a display device and an audio system including the same, and more particularly, to a technology for synchronizing an image displayed on a display device with a sound output from a sound output device.

In the modern society, as interest in displays increases, various technologies for improving display performance have been developed.

Very thin televisions such as liquid crystal displays (LCDs) and plasma display panels (PDPs) instead of the CRTs (Cathode Ray Tubes) that have been used for many years since the beginning of conventional television broadcasting. A water phase machine has been developed and put into practical use.

In addition, as technology for digital display devices is developed and commercialized, various types of contents such as Contents on Demand and movies, in addition to broadcasts received in real time, may be provided through an external device such as a PC, an external server, or a game console. The home theater system, which can be enjoyed at home, which has moved a large and large theater into the home, is also becoming a practical use, and the home theater system is also referred to as an audio system.

In general, an audio system includes a video device and an audio device. The video device includes a television and a screen. The audio device includes a multi-channel sound output device such as a 5.1 channel and an audio receiver, and an additional DVD / VCR. A reproducing apparatus for reproducing a reproducing medium of can be connected.

The video signal may be displayed through a screen after performing signal processing in a video device such as a digital TV or a DVD player, and the audio signal may be output through a sound output device after performing audio signal processing in an audio receiver.

However, in the case of an audio system, since a video device and an audio device exist separately, there is a problem that the image displayed on the video device does not match the sound output from the audio signal as much as the signal received from the video device is performed.

Therefore, there is a problem in that the display quality of the audio signal and the output of the audio signal are inconsistent and thus the reproduction service quality of the audio system is degraded.

Accordingly, the display device and the audio system according to an embodiment are invented to solve the above-described problems. When the video output from the video device and the sound output from the audio device do not match, the display device can be efficiently solved. And to provide an audio system.

According to an exemplary embodiment, a display apparatus includes an audio output unit configured to transmit an audio signal and a marker signal in an inaudible region to an external sound output apparatus, and output from the external sound output apparatus in response to the audio signal and a marker signal in an inaudible region. A sound receiving unit for receiving sound waves and a control unit calculating a delay time based on a difference between a transmission time of the marker signal and a reception time of the sound wave, and correcting the transmission time of the audio signal based on the calculated delay time. can do.

The controller may detect the marker signal from the sound wave, and calculate a delay time based on a transmission time of the marker signal transmitted from the audio output unit and a reception time of the marker signal detected from the sound wave signal.

The controller may delay or advance the transmission time of the audio signal by the delay time.

The display apparatus further includes a display panel displaying an image, and the control unit transmits the audio signal so that the image displayed on the display panel and the sound wave output by the external sound output device are synchronized with the audio signal. Can be corrected.

The marker signal may include a signal formed according to a predetermined pattern in the frequency range of the inaudible region.

The marker signal may include a signal having a plurality of different patterns in the frequency range of the inaudible region.

The inaudible region may include a frequency range of 18 khz to 24 khz.

The audio output unit may transmit a signal obtained by synthesizing the marker signal with the audio signal.

The audio output unit may periodically transmit the marker signal.

The audio output unit may transmit the marker signal to a predetermined external sound output device when there are a plurality of external sound output devices.

The audio output unit may transmit the marker signal to an external sound output device located at a closest distance to the display device when the external sound output device has a plurality of external sound output devices.

The audio output unit may transmit the marker signal when a power state of the display apparatus changes or when a user receives a correction command at the time of transmitting the audio signal.

The audio output unit may transmit the marker signal when the type of the audio signal is changed or the type of the image displayed on the display is changed.

The sound receiver may include a microphone provided on at least one surface of the display device, and the controller may calculate the delay time based on the position of the microphone.

The display device further comprises a remote control device for controlling the operation of the display device, the microphone is provided on at least one side of the remote control device, the control unit is based on the position of the microphone of the audio signal The transmission time point can be controlled.

According to an embodiment, an audio system generates at least one sound output device corresponding to an audio signal received from an audio output unit and a marker signal of an inaudible region, and outputs the generated sound wave to the outside, and the audio signal and the An audio output unit for transmitting a marker signal in an inaudible region to the sound output device, a sound receiver for receiving sound waves output from the sound output device, and a delay based on a difference between a transmission time of the marker signal and a reception time of the sound wave The display device may include a control unit configured to calculate a time and correct a transmission time point of the audio signal based on the calculated delay time.

The controller detects the marker signal from the sound wave, and calculates a delay time based on a transmission time of the marker signal transmitted from the audio output unit and a reception time of the marker signal detected from the sound wave signal.

The controller may delay or advance a transmission time of the audio signal by the delay time.

The marker signal may include a signal formed according to a predetermined pattern in the frequency range of the inaudible region or a signal having a plurality of different patterns in the frequency range of the inaudible region.

The audio output unit may periodically transmit the marker signal.

The audio output unit may transmit the marker signal to a predetermined external sound output device when there are a plurality of external sound output devices.

The audio output unit may transmit the marker signal to an external sound output device located at a closest distance to the display device when the external sound output device has a plurality of external sound output devices.

The audio output unit may transmit the marker signal when a power state of the display apparatus changes or when a user receives a correction command at the time of transmitting the audio signal.

The audio output unit may transmit the marker signal when the type of the audio signal is changed or the type of the image displayed on the display is changed.

The display device further comprises a remote control device for controlling the operation of the display device, the microphone is provided on at least one side of the remote control device, the control unit is based on the position of the microphone of the audio signal The transmission time point can be controlled.

The display apparatus and the audio system according to the exemplary embodiment automatically calculate the delay time based on the signal of the inaudible region and correct the delay time based on the signal, so that the audio signal and the video signal may not be immersed. Solve inconsistencies.

1 is a view illustrating an appearance of a display apparatus according to an exemplary embodiment.
2 is a diagram illustrating a display apparatus receiving an image from an external device according to an exemplary embodiment.
3 is a diagram illustrating an audio system including a display device according to an exemplary embodiment.
4 is a block diagram illustrating some components of a display apparatus according to an exemplary embodiment.
5 is a diagram illustrating a relationship between a display apparatus and a sound output apparatus according to an exemplary embodiment.
6 is a flowchart illustrating a control method of a display apparatus according to an exemplary embodiment.
7 illustrates an audio signal and a frequency band output according thereto.
8 and 9 are diagrams illustrating a first signal obtained by synthesizing an audio signal and a marker signal, according to an exemplary embodiment.
10 is a diagram illustrating various locations in which a microphone may be provided according to an embodiment.
11 and 12 illustrate a method of measuring a delay time according to positions of microphones.

Configurations shown in the embodiments and drawings described herein is a preferred example of the disclosed invention, there may be various modifications that can replace the embodiments and drawings of the present specification at the time of the filing of the present application.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting and / or limiting the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

As used herein, the terms 'comprise', 'comprise' and 'have', etc., are intended to designate the existence of a feature, number, step, operation, configuration, or combination thereof, described in the specification, and one or more other features. It does not preclude the existence or addition of numbers or steps, operations, components, parts or combinations thereof.

In addition, terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. It is used only to distinguish one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term “and / or” includes any combination of a plurality of related items or any item of a plurality of related items.

In the following description, related drawings will be described together in order to prevent duplication of description.

1 is a view illustrating an appearance of a display apparatus according to an exemplary embodiment.

Referring to FIG. 1, the display apparatus 100 may include a display panel 110 displaying an image and a frame 10 disposed behind the display panel 110 to support the display panel 110.

The display apparatus 100 according to an exemplary embodiment refers to a device capable of outputting an image by processing an image signal stored in advance in the display apparatus 100 or received from the outside.

For example, when the display apparatus 100 is a TV, the display apparatus 100 may receive a broadcast signal transmitted from a broadcasting station and process the same to output an image and a sound included in the broadcast signal. Alternatively, the video signal and the audio signal may be received from the set top box.

In addition, the display apparatus 100 may be implemented in various forms such as a monitor, a portable multimedia apparatus, a portable communication apparatus, a portable computing apparatus, and the like. The display apparatus 100 is a device that visually displays an image. Not

In addition, as shown in FIG. 1, when the display apparatus 100 is implemented as a stand type, the display apparatus 100 may support the display panel 110 and the frame 10 so that the display apparatus 100 may be stably disposed on a horizontal plane. The stand 20 may be provided at the bottom of the frame 10.

In addition, the display apparatus 100 may be implemented as a wall-mounted type. When the display apparatus 100 is implemented as a wall-mounted type, the display apparatus 100 may include a structure such as a bracket at the rear of the frame 10. Can be installed on the wall.

For convenience of description, the display apparatus 100 will be described with reference to an example in which the display apparatus 100 receives a video signal and an audio signal from a variety of content sources. do.

2 is a diagram illustrating an example in which the display apparatus 100 receives image data from an external device, according to an exemplary embodiment.

As illustrated in FIG. 2, the display apparatus 100 may generate an image and receive image data from an external device 400 or 500 stored wirelessly or by wire, and display the received image.

In detail, the external device may refer to an image content providing device 400 that outputs an image signal, and the image content providing device 400 reproduces the image content stored in itself or the image content from the external image server 500. Can be provided.

In addition, as shown in FIG. 2, the display apparatus 100 may not be provided with image content only from the image content providing device 400, but may also be provided with image content from a separate external image server 500. . In this case, the display device may receive an image from the external image server 500 using wireless communication.

The image content providing apparatus 400 and the external image server 500 are merely given for convenience in consideration of the operation of providing the image content in this embodiment, but are not limited to a specific form.

Therefore, the image content providing device 400 is not limited to its implementation form, for example, an optical media player such as a DVD or Blu-ray, a UHD player, a set-top box, a TV, a computer body, a mobile device, a game console. It may be implemented in various forms such as an audio system such as a home theater. For the convenience of description, the specification will be described with reference to the audio system.

3 is a diagram illustrating an audio system 300 including a display apparatus 100 and a plurality of sound output apparatuses 200 according to an exemplary embodiment.

As illustrated in FIG. 3, the audio system 300 includes a display apparatus 100, a plurality of sound output apparatuses 200a to 200f, and an external device for transmitting audio and video signals to the display apparatus although not shown. Devices 400, 500.

The display apparatus 100 displays an image corresponding to a video signal received from the external apparatuses 300 and 400 on the display panel 110 and simultaneously outputs audio signals at different positions. Can be sent by The sound output apparatus 200 may signal-process the received audio signal and then three-dimensionally output sound waves to the outside in a multi-channel manner.

In detail, the plurality of sound output devices 200 may include first sound output devices C and 200a installed at the front center and second sound output devices installed at the front left side, based on the user U located at the center. FL, 200b, the third sound output device FR, 200c provided on the front right, the fourth sound output device W, 200d provided on the left or right center, and the fifth sound installed on the left back The output devices RL and 200e and the sixth sound output devices RR and 200f provided on the rear right side may be provided.

Accordingly, the user U who installs the audio system 300 may operate the remote control device 171 and three-dimensionally listen to the 5.1-channel audio output through the six sound output devices 200. You can watch the high-definition video displayed more vividly.

Although the sound output apparatus 200 is illustrated as six in the drawing, the present invention is not limited thereto and may include at least one sound output apparatus 200 according to a usage environment.

The display device 100 receives a video signal from the external devices 400 and 500 and displays the image on the display panel 110. At this time, the A / V synchronization for the A / V signal is set. In addition, the display apparatus 100 transmits the audio signals received from the external devices 400 and 500 to the sound output device 200, and the sound output device 200 delays the input audio signal for a predetermined time and amplifies the signal to a predetermined level. Then output to the outside.

In this case, a synchronization error may occur between the image displayed on the display apparatus 100 and the sound output from the sound output apparatus 200. For example, the image displayed on the display panel 110 is delayed by about 3-4 frames (50-70 ms) until the video signal is received by the external devices 400 and 500 and displayed on the display panel 110, but the audio signal is delayed. The audio signal may be delayed by about 3-4 frames (60-85us) received from the audio signal output from the sound output device 200.

As a result, in a typical audio system, the video signal may be delayed by 50 ms or more than the audio signal. However, the audio signal may be delayed rather than the video signal as described above depending on the operating conditions and environment of the display apparatus 100 and the sound output apparatus 200.

Therefore, the conventional audio system determines a delay time between audio and video while manually listening to an image displayed on the display apparatus 100 and a sound output through the sound output apparatus 200, and manually determines a difference by the delayed time. It should have been calibrated.

Therefore, the conventional correction method causes inconvenience to the user by allowing the user to determine the amount of delay between the audio and video signals, and viewers who are not used to using electronic devices should watch without improving the synchronization error. There was discomfort.

In addition, in recent years, many display devices (projectors, monitors, TVs, etc.) and audio systems have been used together. Since the video processing time of each display device is different, a multi-input source (more than two video input sources) In this case, there is a problem in that the lip-sync between the systems cannot be solved.

Therefore, the display apparatus 100 and the audio system 300 according to an embodiment are invented to solve the above-described problem. When the image output from the display apparatus and the sound output from the sound output apparatus do not match, It is to provide a display device that can be synchronized more efficiently by using a signal in the inaudible region without a manual operation of a user. Hereinafter, the drawings will be described in detail.

4 is a flowchart illustrating some components of the display apparatus 100 according to an exemplary embodiment.

Referring to FIG. 4, the display apparatus 100 includes a display panel 110 for displaying an image received from an external device, a receiver 120 for receiving content including an audio signal and a video signal from an external device, and included in the content. An image processor 130 for processing a video signal, a communication unit 140 for transmitting and receiving various data such as content through a communication network, and an audio output unit 150 for transmitting an audio signal and a marker signal of an inaudible region to an external sound output device. The sound receiver 160 receives sound waves output from the audio output unit 150 in response to the audio signal and the marker signal of the inaudible region, and the input unit 170 receives various control commands for the display apparatus 100 from the user. And a transmission time of at least one of the video signal and the audio signal based on the sound wave received by the sound receiver 160. The controller 180 may collectively control an operation of the play device 100.

At least one of the receiver 120, the image processor 130, the communicator 140, and the controller 180 may be integrated in a system on chip (SOC) embedded in the display apparatus 100. However, since only one system on chip embedded in the display apparatus 100 may not exist, the present invention is not limited to being integrated into one system on chip.

The display panel 110 may display an image received from an external device to the outside. Accordingly, the display panel 110 may be implemented as a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, an organic light emitting diode (OLED) panel, or the like. In addition, the touch screen panel may be implemented to output an image to the outside and receive a command for controlling the display apparatus 100 from a user.

The receiver 120 may receive various contents from various external devices. For example, the receiver 120 may store an antenna that receives a broadcast signal wirelessly, a set top box that receives a broadcast signal wirelessly or by wire, and converts the received broadcast signal appropriately, and is stored in a multimedia storage medium. The content can be received from a multimedia reproducing apparatus (for example, a DVD player, a CD player, a Blu-ray player, etc.) that reproduces the content.

In detail, the receiver 120 includes a plurality of connectors 121 connected to an external device, a reception path selector 123 for selecting a path from which a content is received among a plurality of connectors 121, and a broadcast signal in receiving a broadcast signal. And a tuner 125 for selecting a channel (or frequency) for receiving the signal.

Connector 121 is a coaxial cable connector (RF coaxial cable connector) for receiving a broadcast signal containing the content from the antenna, a high definition multimedia interface (HDMI) connector for receiving content from a set-top box or a multimedia playback device , A component video connector, a composite video connector, a D-sub connector, and the like.

The reception path selector 123 selects a connector to receive content among the plurality of connectors 121 described above. For example, the reception path selector 123 may automatically select the connector 121 in which the content is received or manually select the connector 121 to receive the content according to a user's control command.

When the tuner 125 receives a broadcast signal, the tuner 125 extracts a transmission signal having a specific frequency (channel) among various signals received through an antenna. In other words, the tuner 125 may select a channel (or frequency) for receiving content according to a user's channel selection command.

When a video signal regarding the selected channel is received through the tuner 125, the video signal may be transferred to the image processor 150. Accordingly, the image processor 130 may acquire color data, an image control signal, and the like through a video signal through an image processing process.

In addition, the display apparatus 100 may include an image processor 130 as shown in FIG. 4, and the image processor 130 may include a graphic processor 131 and a graphic memory 133.

The graphics memory 133 may store an image processing program for processing an image and color data processed by the video signal, or temporarily store image information output from the graphic processor 131 or image information received from the receiver 120. Can be.

The graphic processor 131 may acquire various data necessary for image restoration by processing a video signal stored in the graphic memory 135 using an image processing program stored in the graphic memory 135.

For example, the graphic processor 131 may acquire an image control signal, color data, etc. by performing image processing on video data among contents stored in the graphic memory 133.

In addition, the graphic memory 135 may store data relating to an application program, an algorithm, and the like, which analyzes the color pattern of the color data. Alternatively, the graphics memory 133 may store data related to color patterns whose polarities are biased to one side, and the graphics processor 131 may use the data stored in the graphics memory 135 for each source drive or source driver. It may be determined whether the polarity setting is necessary for each pixel connected with.

The communication unit 140 may support various communication methods, including a wireless communication module 141 supporting a wireless communication method and a wired communication module 143 supporting a wired communication method.

The communication method includes a wireless communication method and a wired communication method. Here, the wireless communication method refers to a communication method capable of transmitting and receiving a signal containing data wirelessly. In this case, 3G (3Generation), 4G (4Generation), Wireless LAN, Wi-Fi, Bluetooth, Zigbee, WFD (Wi-Fi Direct), UWB (Wireless LAN) There are various communication methods such as ultrawideband, infrared data association (IrDA), Bluetooth low energy (BLE), near field communication (NFC), and Z-Wave, but are not limited thereto.

In addition, the wired communication method means a communication method that can send and receive a signal containing data by wire. For example, a wired communication method may include a peripheral component interconnect (PCI), a PCI-express, a universal serial bus (USB), and the like, but is not limited thereto. For example, the controller 180 may control an operation of the communication unit 140 through a control signal, download various contents through a wired communication network or a wireless communication network, and provide the same to a user.

Meanwhile, each of the wired communication module 141 and the wireless communication module 143 may be implemented as a single chip. However, the implementation form is not limited to the above description, and there is no limitation such that the wired communication module 141 and the wireless communication module 143 may be integrated into a single chip.

In addition, the display apparatus 100 may include an audio output unit 150.

In detail, the audio output unit 150 may generate the marker signal of the audio signal and the inaudible region and transmit the generated marker signal and the audio signal to the external sound output device 200.

The audio output unit 150 may generate a marker signal formed according to a predetermined pattern in the frequency range of the inaudible region, and may generate a marker signal having a plurality of different patterns in the frequency range of the inaudible region.

In addition, the audio output unit 150 may separate the audio signal and the marker signal and transmit the separate signal to the external sound output device 200 as a separate signal. Transmit to device 200. In addition, the inaudible region refers to a sound of a frequency region that is not recognizable by a person, and may generally include a frequency region of 18 khz to 24 khz. Detailed description thereof will be described with reference to FIGS. 7 and 8.

In addition, the audio output unit 150 transmits a marker signal to the external sound output device 200 according to a preset period in order to synchronize the image reproduced by the display apparatus 100 with the sound waves output from the sound output apparatus 200. can do. The preset period may be set differently according to the type of the image to be played, or may be set manually by the user.

In addition, when the audio output unit 150 transmits the marker signal to the plurality of sound output devices 200, the marker signal is transmitted to the predetermined external sound output device 200 in order to prevent a problem caused by the interference effect. Can be sent.

In addition, when there are a plurality of external sound output devices 200, the marker signal may be transmitted to the external sound output device 200 which is located at the closest distance to the display device 100. When transmitting to one external sound output device without transmitting to the plurality of external sound output devices 200, the detection of the marker can be more accurately performed. Detailed description thereof will be described in detail with reference to FIGS. 11 and 12.

In addition, although the audio output unit 150 is illustrated as a separate component distinguished from the controller 180 in FIG. 4, the audio output unit 150 is not limited thereto, and the audio output unit 150 may include the audio output unit 150. In this case, the controller 180 may play a role of the audio output unit 150 described above.

The sound receiver 160 may receive sound waves output from the external sound output device 200 in response to the audio signal transmitted from the audio output unit 160 to the external sound output device and the marker signal of the inaudible region.

Therefore, the sound receiver 160 may be provided with various sensors that can detect and receive external sound waves, for example, may include a microphone (161). It may be provided on at least one surface of the display device 100 of the microphone 161 to detect and receive external sound waves, or may be provided on one surface of the remote control device 170.

The input unit 170 may receive various control commands from the user.

For example, the input unit 170 may include a remote control device including a button group, as shown in FIG. 1. In one embodiment, the button group may include a magnitude of sound waves output from an external sound output device. It may include a volume button for adjusting the, a channel button for changing the communication channel received by the receiver 120, a power button for turning on / off the power of the display apparatus 100.

In addition, the input unit 170 may receive various control commands related to the display apparatus 100 from the user through the remote control device 171, and include various well-known components that may receive control commands from the user. You can do it, there is no limit.

In addition, when the display panel 110 is implemented as a touch screen type, the display panel 110 may perform a function of the input unit 170.

Accordingly, the input unit 170 may transmit the received control command to the controller 180, and the controller 180 may control at least one of the components of the display apparatus 100 through the control signal.

The controller 180 may be provided in the display apparatus 100. The controller 180 may include a processor 181 and a memory 183 as shown in FIG. 4.

The memory 183 may store a control program and control data for controlling the operation of the display apparatus 100, and temporarily store a control command input through the input unit 160 or a control signal output from the processor 181. Can be. As a result, the processor 181 can process various data stored in the memory 183 according to the control program stored in the memory 183.

The processor 181 may control overall operations of the display apparatus 100. The processor 181 may generate a control signal for controlling the components of the display apparatus 100 to control the operation of each component.

For example, the processor 181 may control the communication unit 140 through a control signal, thereby exchanging a signal including data with an external device. In another embodiment, the processor 181 transmits a control signal to the sound output unit 150 according to the sound control command received through the input unit 160, and the sound of the sound output through the sound output device 151. It can be scaled.

As another example, the processor 181 may control the image processor 130 to perform image processing on the content received from the receiver 120, and control the display panel 110 to display the image processed image.

Although the processor 181 and the memory 183 are separately described above, the processor 181 and the memory 183 are not limited to being provided as separate chips, and the processor 181 and the memory 113 are single. It may be provided as a chip.

In addition, the controller 180 controls the audio signal based on the audio signal transmitted from the external sound device 200 by the audio output unit 150, the marker signal in the inaudible region, and the sound wave output from the external sound output device 200. The transmission time point can be corrected.

Specifically, the controller 180 calculates a delay time based on the difference between the transmission time of the marker signal and the reception time of the sound wave, and delays or advances the transmission time of the audio signal based on the calculated delay time. The transmission point of the signal can be corrected.

In addition, the controller 180 detects the marker signal from the sound wave for accurate measurement, and adjusts the delay time based on the transmission time of the marker signal transmitted from the audio output unit 150 and the reception time of the marker signal detected from the sound wave signal. The transmission time of the audio signal can be corrected based on the calculation. A detailed description thereof will be described with reference to FIG. 5.

5 is a block diagram illustrating some components of an audio system 300 including a display apparatus 100 according to an exemplary embodiment.

In FIG. 5, the display apparatus 100 is similar to the display apparatus described with reference to FIG. 4. In FIG. 5, only some of the components illustrated in FIG. 4 are illustrated for convenience of description.

The audio output unit 150 of the display apparatus 100 outputs a first signal including an audio signal received from the external device 400 and a marker signal of the generated inaudible region to the signal processor of the sound output apparatus 200. 210). As an example, the sound output device 200 may include a speaker.

For convenience, only the audio signal and the marker signal of the inaudible region are combined and named as the first signal, and the audio signal and the signal in the inaudible region may be transmitted in a synthesized form or may be transmitted independently.

The signal processor 210 receiving the audio signal and the marker signal of the inaudible region from the audio output unit 150 generates a sound to be output to the outside through a signal processing process and transmits the generated sound to each sound output device. Can be.

For example, as illustrated in FIG. 6, six sound output devices FL, FR, C, RL, RR, and W may be transmitted. In addition, the signal generated by the signal processor 210 corresponding to the first signal will be referred to as a second signal.

 The sound receiver 160 may receive sound waves output from the sound output device 200 and transmit the received sound waves to the controller 180.

However, in this process, the signal processing unit 210 must go through a signal processing process in accordance with the sound wave to output the audio signal, it may take a predetermined time (t). Therefore, a predetermined delay time may occur in the process of receiving the first signal and generating and outputting the second signal corresponding thereto, so that the image reproduced by the display apparatus 100 and the sound wave output from the sound output apparatus 200 are generated. Can cause problems that do not match.

Therefore, the audio system 300 according to an exemplary embodiment calculates a time t for signal processing in the sound output apparatus 200 by using a marker signal of an inaudible region, and then based on the audio output unit 150. By adjusting the view point of the signal transmitted from the display apparatus 100, the image reproduced by the display apparatus 100 and the sound wave output from the sound output apparatus 200 may be corrected to match each other.

In detail, the controller 180 detects a marker signal from sound waves received by the sound receiver 160, and adjusts a delay time based on a transmission time of the marker signal transmitted from the audio output unit 150 and a reception time of the marker signal. Can be calculated.

For example, after transmitting the first signal from the audio output unit 150, if the time when the second signal is received by the sound receiver 160 takes 0.5 seconds, the audio output unit 150 outputs the 0.5 second time. The transmission time of the audio signal can be advanced.

On the contrary, if the signal processing time of the video signal is long in the display apparatus 100 and the time of the sound wave output from the sound output apparatus 200 is 0.5 seconds faster than the image output from the display apparatus 100, 0.5 second The transmission time can be delayed by time.

In the prior art, since a user input was required to determine the delay time, and an artificial signal had to be generated to determine the delay time, there was a problem of preventing a user's immersion due to some kind of noise.

However, since the display apparatus 100 and the audio system 300 automatically calculate the delay time and correct the delay time using a signal of the inaudible region, the delay time is naturally avoided without the user's immersion. You can correct it. Hereinafter, the method will be described in detail with reference to FIGS. 6 to 9.

6 is a flowchart illustrating an operation sequence of the display apparatus 100 according to an exemplary embodiment. FIG. 7 is a diagram illustrating an audio signal and a frequency band corresponding thereto. 8 and 9 are diagrams illustrating a first signal obtained by synthesizing an audio signal and a marker signal, according to an exemplary embodiment.

Referring to FIG. 6, the display apparatus 100 may receive a video signal for an image to be displayed on the display panel 110 and an audio signal to be transmitted to the external sound output apparatus 200 from the external devices 300 and 400. have. (S110)

Thereafter, the display apparatus 100 may transmit an audio signal and a signal having a predetermined pattern of the inaudible region to the external sound output apparatus 200. (S120)

Referring to FIG. 7, FIG. 7A illustrates a sound wave output from an audio signal, and FIG. 7B illustrates a frequency band recognizable by a person in the audio signal.

That is, as shown in FIG. 7B, the sound waves in the X band (18000 Hz to 24000 Hz) of frequency correspond to the sound waves in a region that humans cannot perceive. Therefore, when the signal in the X band is used, the delay time can be measured without generating noise.

Referring to FIGS. 8 and 9, the display apparatus 100 according to an embodiment may transmit a first signal obtained by combining an audio signal and a marker signal of an inaudible region to the external voice output apparatus 200. .

The audio signal of FIG. 8 is a signal generated in a band of a range that can be recognized by a person. Therefore, this signal is modulated into a sound wave that can be perceived by a human by an external voice output device and then output to the outside.

However, since the marker signal is a signal generated in the band of the inaudible region which is not visible to a human, a human cannot recognize it even if it is output by an external device. However, since the microphone 161 provided on one surface of the display apparatus 100 may receive sound waves in all bands, the microphone 161 may receive marker signals in the non-audible region, and the display apparatus 100 may use the delay time based thereon. Can be calculated and corrected.

 Therefore, the display apparatus 100 according to an exemplary embodiment does not generate a separate sound to calculate a correction time, and thus may not prevent a user's immersion and may naturally correct a delay time. do.

In addition, as shown in FIG. 8, the marker signal is illustrated as an example, and may be formed in various patterns according to a use environment. That is, as shown in FIG. 9, the signal may be formed in a form of increasing signal size (a signal-b signal-c signal). In contrast, the signal may be formed in a form of decreasing signal size. It is not limited to.

In addition, the marker signal may not be transmitted once but may be repeatedly transmitted at a predetermined period in order to calculate an accurate delay time, and the period may be variously set by the user according to the use environment. When it is difficult to measure an accurate delay time after one transmission, as shown in FIG. 9, the next marker signal may transmit a signal having a large signal size.

In addition, the marker signal is transmitted to the external sound output device 200 to measure the delay time when the power state of the display apparatus 100 is changed or, for example, when the state is changed from OFF to ON. It may be transmitted even if the user receives a correction command of a transmission point of the audio signal.

In addition, the marker signal may be transmitted to the external sound output device 200 since the delay time needs to be newly measured when the type of the audio signal or the video signal received from the external devices 300 and 400 is changed.

6, when the audio signal and the marker signal are transmitted to the external sound output device 200, the external sound output device 200 may receive sound waves output corresponding to the signals. (S130)

The sound wave output from the external sound output device 200 is divided into sound waves that can be recognized by a person who is output in correspondence with the audio signal and sound waves that can not be printed by a person who is output in correspondence with the marker signal.

Accordingly, the microphone 161 provided on one surface of the display apparatus 100 may detect the marker signal from the received signals and calculate a delay time based on the transmission time and the reception time of the marker signal. (S140, S150)

The time point at which the audio signal is output can be corrected based on the calculated delay time. (S160)

In detail, when the delay time is determined to be 1 second, the transmission time of the audio signal may be advanced by the time of 1 second. On the contrary, the signal processing time of the video signal is long in the display apparatus 100 and thus the display apparatus 100 If the time of the sound wave output from the sound output device 200 is 1 second faster than the image output from the S1, the transmission time may be delayed by 1 second.

In the prior art, since a user input was required to determine a delay time, and an artificial signal had to be generated to determine the delay time, there was a problem of preventing some kind of immersion of the user due to some kind of noise. The display apparatus 100 and the audio system 300 automatically calculate the delay time and correct the delay time using a signal of the inaudible region, so that the delay time can be naturally corrected without preventing the user's immersion. .

FIG. 10 illustrates various locations in which the microphone 161 may be provided according to an embodiment.

Referring to FIG. 10, the microphone may be provided at various places according to the manufacturing environment of the display apparatus 100. As shown in FIG. 10, the front surface may be provided at the left edge 161a of the front top, and may be provided at the front center top 161f or the right edge 161e of the front surface. On the contrary, it may be provided at the left edge 161b of the front lower end, and may be provided at the front center portion 161c or the right edge 161d of the front equivalent.

11 is a diagram illustrating a method of measuring a delay time according to the position of the microphone 161.

Referring to FIG. 11, when there are a plurality of sound output devices 200 capable of transmitting marker signals, the audio output unit 150 may transmit a marker signal only to a preset sound output device.

In general, since a plurality of sound output devices 200 exist in a limited space, when a marker signal is transmitted to the plurality of sound output devices 200, a delay time that may cause an interference problem may not be accurately measured. Therefore, the display apparatus 100 according to an exemplary embodiment may transmit the marker signal only to the preset sound output device 200.

For example, as illustrated in FIG. 11, the marker signal may be transmitted only to the second sound output device 200b, and only the sound wave signal output from the second sound output device 200b may be received using the microphone 161. have.

In addition, although not shown in the drawing, only the sound wave signals output from the first sound output device 200a are transmitted only to the first sound output devices C and 200a that are closest to the display device 100. 161 may be used.

In calculating the delay time, as shown in FIG. 11, the delay time may be more accurately calculated by reflecting the position of the microphone 161.

As an example, when the microphone 161 is present on the left side of the display apparatus 100, the delay time may be calculated based on the distance d1 from the second sound output device 200b. In addition, when the microphone 161 is present in the center of the display apparatus 100, the delay time may be calculated based on the distance d2 from the second sound output apparatus 200b.

When the microphone 161 is positioned at the center of the display apparatus 100, since the distance is longer (d1 <d2) than when it is present on the left side, it may take a longer time for the sound wave to reach. Therefore, in calculating the delay time in consideration of this point, it is possible to calculate a more accurate delay time.

12 is a diagram illustrating a method of measuring a delay time when the microphone 161 is provided on one surface of the remote control apparatus 171.

When the microphone 161 is provided at the center of the display apparatus 100, the distance between the second sound output device 200b and the microphone 161 corresponds to d4, so that the delay time may be calculated in consideration of d4. Can be.

However, when the microphone 161 is provided on one surface of the remote control device 171, the sound wave output from the microphone 161, the second sound output device 200b provided in the remote control device 171 may be received. . Therefore, in this case, since the distance between the second sound output device 200b and the microphone 161 corresponds to d5, the delay time may be calculated in consideration of d5 in calculating the delay time.

That is, since the display apparatus 100 and the audio system 300 according to an exemplary embodiment may calculate the delay time in consideration of the positional characteristic in which the microphone 171 is provided, the delay time may be more accurately calculated. There is an advantage.

So far, the display apparatus 100 and the audio system 300 have been described with reference to the drawings.

In general, when the display apparatus plays back an image received through an external device, since the format and the playback method of the provided image are various, in order to reproduce the image with optimized image quality, the characteristics of the image and the played back of the display apparatus are played. The setting should be made according to the function.

In the prior art, when the image displayed on the display device and the sound output from the sound output device do not match, a user input is required to determine the delay time, and an artificial signal must be generated to determine the delay time. Because of this, a kind of noise occurs to prevent the user's immersion.

However, since the display apparatus 100 and the audio system 300 automatically calculate the delay time and correct the delay time using a signal of the inaudible region, the delay time is naturally avoided without the user's immersion. There is an effect that can be corrected.

Although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims that follow.

100: display device
110: display panel
120: receiver
130: image processing unit
140: communication unit
150: audio output
160: sound receiving unit
170: input unit
200: sound output device
300: audio system

Claims (25)

An audio output unit configured to transmit an audio signal and a marker signal of an inaudible region to an external sound output device;
A sound receiver configured to receive sound waves output from the external sound output device in response to the audio signal and the marker signal of the inaudible region; And
And a controller configured to calculate a delay time based on a difference between a transmission time of the marker signal and a reception time of the sound wave, and correct the transmission time of the audio signal based on the calculated delay time. The method of claim 1,
The control unit,
And detecting the marker signal from the sound wave and calculating a delay time based on a transmission time of the marker signal transmitted from the audio output unit and a reception time of the marker signal detected from the sound wave signal. The method of claim 1,
The control unit,
And a display device which delays or advances the transmission time point of the audio signal by the delay time. The method of claim 1,
And a display panel for displaying an image.
The control unit,
And a display device configured to correct a transmission point of the audio signal so that an image displayed on the display panel corresponding to the audio signal and a sound wave output by the external sound output device are synchronized. The method of claim 1,
The marker signal is,
And a signal formed according to a predetermined pattern in the frequency range of the inaudible region. The method of claim 1,
The marker signal is,
Display device including a signal having a plurality of different patterns in the frequency range of the inaudible region. The method of claim 1,
The inaudible region,
Display device comprising a frequency range of 18khz to 24khz. The method of claim 1,
The audio output unit,
And a display device configured to transmit a signal obtained by combining the marker signal with the audio signal. The method of claim 1,
The audio output unit,
Display device for transmitting the marker signal periodically. The method of claim 1,
The audio output unit,
And a plurality of the external sound output devices to transmit the marker signal to a predetermined external sound output device. The method of claim 1,
The audio output unit,
And a plurality of the external sound output devices to transmit the marker signal to an external sound output device located at a closest distance to the display device. The method of claim 1,
The audio output unit,
And transmitting the marker signal when a power state of the display apparatus changes or a user receives a correction command at the time of transmitting the audio signal. The method of claim 1,
The audio output unit,
And transmitting the marker signal when the type of the audio signal is changed or the type of the image displayed on the display is changed. The method of claim 1
The sound receiver includes a microphone provided on at least one surface of the display device,
And the control unit calculates the delay time based on the position of the microphone. The method of claim 1,
The display device further includes a remote control device for controlling the operation of the display device,
The microphone is provided on at least one side of the remote control device,
The control unit,
And a display point of time at which the audio signal is transmitted based on the position of the microphone. At least one sound output device generating sound waves corresponding to the audio signal received from the audio output unit and the marker signal of the inaudible region and outputting the generated sound waves to the outside; And
An audio output unit configured to transmit the audio signal and the marker signal of the inaudible region to the sound output device;
A sound receiver configured to receive sound waves output from the sound output device;
And a controller configured to calculate a delay time based on a difference between the transmission time of the marker signal and the reception time of the sound wave, and to correct the transmission time of the audio signal based on the calculated delay time. Audio system. The method of claim 1,
The control unit,
And detecting the marker signal from the sound wave and calculating a delay time based on a transmission time of the marker signal transmitted from the audio output unit and a reception time of the marker signal detected from the sound wave signal. The method of claim 16,
The control unit,
And delay or advance the transmission time point of the audio signal by the delay time. The method of claim 16,
The marker signal is,
An audio system comprising a signal formed according to a predetermined pattern in the frequency range of the inaudible region or a signal having a plurality of different patterns in the frequency range of the inaudible region. The method of claim 16,
The audio output unit,
And an audio system periodically transmitting the marker signal. The method of claim 16,
The audio output unit,
And a plurality of the external sound output devices to transmit the marker signal to a predetermined external sound output device. The method of claim 16,
The audio output unit,
And a plurality of the external sound output devices, and transmitting the marker signal to an external sound output device located at the closest distance to the display device. The method of claim 16,
The audio output unit,
And transmitting the marker signal when a power state of the display device changes or a user receives a correction command at the time of transmitting the audio signal. The method of claim 16,
The audio output unit,
And the marker signal when the type of the audio signal is changed or the type of the image displayed on the display is changed. The method of claim 16,
The display device further comprises a remote control device for controlling the operation of the display device, the microphone is provided on at least one side of the remote control device,
And the controller controls a transmission time point of the audio signal based on the position of the microphone.

Images