KR20100060717A - Method for synchronization between video/audio output and display device thereof - Google Patents

Method for synchronization between video/audio output and display device thereof Download PDF

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Publication number
KR20100060717A
KR20100060717A KR1020080119435A KR20080119435A KR20100060717A KR 20100060717 A KR20100060717 A KR 20100060717A KR 1020080119435 A KR1020080119435 A KR 1020080119435A KR 20080119435 A KR20080119435 A KR 20080119435A KR 20100060717 A KR20100060717 A KR 20100060717A
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KR
South Korea
Prior art keywords
voice
output device
external
display
audio
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KR1020080119435A
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Korean (ko)
Inventor
이동철
Original Assignee
엘지전자 주식회사
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Priority to KR1020080119435A priority Critical patent/KR20100060717A/en
Publication of KR20100060717A publication Critical patent/KR20100060717A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/439—Processing of audio elementary streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The present invention relates to a display device, the device comprising: a display unit for displaying an image; An interface unit configured to establish a short range wireless communication connection with an external voice output device to transmit and receive a signal with the external voice output device; And a controller configured to compensate for a delay between the image displayed on the display unit and the audio output from the external audio output device by adjusting the display time of the image or the transmission time of the audio signal according to whether the external audio output device is connected.

Description

Method for synchronization between video / audio output and display device about

The present invention relates to a method of synchronizing video and audio output from a display device.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELDs), and vacuum fluorescents (VFDs) have been developed. Various display devices such as displays have been studied and used.

In general, the display device receives image data and audio data from the outside and outputs the image and audio through a display panel or a speaker, and separately to improve the image quality or sound quality of the output image or audio. Signal processing may be performed.

Due to the separate signal processing process as described above, a time delay may occur between an image and an audio output to an actual user, which may provide an unnatural image such as a lip sync of singers.

An object of the present invention is to provide a synchronization method capable of effectively compensating a delay between an output image and an audio and a display device using the same.

A display device according to an embodiment of the present invention, the display unit for transmitting a voice signal to the external audio output device using a short-range wireless communication, and displays an image; An interface unit configured to establish a short range wireless communication connection with the external voice output device to transmit and receive a signal with the external voice output device; And a controller configured to compensate for a delay between the image displayed on the display unit and the audio output from the external audio output device by adjusting the display time of the video or the transmission time of the audio signal according to whether the external audio output device is connected. It includes.

According to an embodiment of the present invention, a video / audio output synchronization method includes receiving voice delay information from an external audio output device; And adjusting the transmission time point of the audio signal such that the image display time point of the display device is delayed by a time corresponding to the received voice delay information rather than the transmission time point of the audio signal.

According to the present invention, when the external audio output device using the short range wireless communication is connected to the display device, the delay between the video and the audio output is compensated by adjusting the timing of the transmission of the audio signal to the external audio output device, so that the display of the natural video is improved. It may be possible. In addition, by compensating the delay between the video and the audio based on the voice delay information transmitted from the external audio output device, the video and audio output can be synchronized more accurately according to the characteristics of the external audio output device.

Hereinafter, a video / audio output synchronization method and a display apparatus using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an embodiment of a configuration of a display apparatus according to the present invention. The illustrated display apparatus 100 may include a controller 110, a display unit 120, and an interface unit 130. Can be.

Referring to FIG. 1, the display apparatus 100 may transmit a voice signal to the external voice output apparatus 200 using short-range wireless communication so that the voice may be output from the external voice output apparatus 200.

According to an embodiment of the present invention, the display apparatus 100 and the voice output device 200 may be connected in a Bluetooth communication manner, and may transmit and receive signals including the voice signal. Also, the voice output device 200 may be a headset or a speaker that may be connected to the display apparatus 100 by using short-range wireless communication.

The controller 110 receives the image data to be displayed, generates an image signal and a control signal, and outputs the image signal and the control signal to the display unit 120, and the display unit 120 displays the image using the input image signal and the control signal.

The controller 110 receives the voice data to be output, generates a voice signal and a control signal, and outputs the voice signal and the control signal to the interface unit 130. The interface unit 130 outputs the external voice output device 200 according to the input control signal. To transmit a voice signal. That is, the interface unit 130 establishes a short range wireless communication connection with the external voice output device 200 and transmits the voice signal to the voice output device 200 using the connected short range wireless communication. do.

That is, when the external audio output device 200 is connected to the display apparatus 100 by using short-range wireless communication, an image is output using the display unit 120 included in the display apparatus 100, and the audio unit is an interface unit. The audio output device 200 may be transmitted to and output from the external voice output device 200 using the 130. Meanwhile, when the external audio output apparatus 200 is not connected to the display apparatus 100, the image and audio may be output through the display unit 120 and the speaker (not shown) included in the display apparatus 100. have.

In addition, the controller 110 outputs the video signal or the audio signal so that the image displayed on the display 120 and the audio output through the external audio output device 200 or an internal speaker (not shown) are synchronized. Can be controlled.

The voice output device 200 may perform voice signal processing for converting the transmitted voice signal into an outputable signal in order to output the voice using the voice signal transmitted from the interface unit 130 of the display apparatus 100. Can be.

For example, in order to improve transmission / reception efficiency of signals, short-range wireless communication schemes such as Bluetooth, respectively, define a coding scheme of a transmitter and a decoding scheme of a receiver. Signal processing according to a prescribed encoding or decoding scheme is performed.

Therefore, the interface unit 130 included in the display apparatus 100 may encode a voice signal input from the controller 110 and then transmit the encoded audio signal to the voice output apparatus 200, and the voice output apparatus 200 may interface with the interface unit 130. After decoding the voice signal received from the) can be output the voice. For example, the voice output device 200 may store the voice signal received from the interface unit 130 in a memory for a predetermined time and then decode the stored voice signal.

When the voice signal is transmitted from the interface unit 130 to the voice output device 200 by the signal processing operation of the voice output device 200 as described above, and when the voice is output from the actual voice output device 200. There may be a time delay in between.

Accordingly, even when the controller 110 synchronizes the video signal and the audio signal and outputs them to the display unit 120 and the interface unit 130, the image and external audio output device 200 actually output from the display unit 120. ), There may be a delay between the audio output from the audio signal, and a lip sync phenomenon may occur between the video and the audio.

The display apparatus 100 according to the present invention may be used in the display unit 120 according to whether the external voice output device 200 is connected to compensate for the voice output delay occurring in the external voice output device 200 as described above. It is preferable to adjust the video display point of time or the audio signal transmission point of time from the interface unit 130.

For example, when outputting audio through an external voice output apparatus 200, the controller 110 displays an image as compared with a case where audio is output through a speaker (not shown) inside the display apparatus 100. By delaying the viewpoint by a predetermined time, the actual audio output from the external audio output device 200 and the image on the display 120 may coincide with the display viewpoint.

That is, when the external audio output device 200 is not connected, the controller 110 controls the video and audio so that the time when the image is displayed on the display 120 and the time when the audio is output from the internal speaker (not shown) coincide. When the external audio output device 200 is connected, the control unit 110 may display a time when the image is displayed on the display unit 120 for a predetermined time than when a voice signal is transmitted to the audio output device 200. Can be controlled to be delayed.

In the case where the external audio output device 200 is connected, the time at which the display point of the image is delayed from the transmission point of the audio signal may be a preset value or a variable value due to an external environment.

Hereinafter, an embodiment of an operation of the display apparatus 100 shown in FIG. 1 will be described in detail with reference to a flowchart showing an embodiment of a video / audio output synchronization method according to the present invention shown in FIG. 4.

The interface unit 130 included in the display apparatus 100 establishes short-range wireless communication with an external voice output device 200, for example, a Bluetooth connection, and delays a voice from the voice output device 200 through the set connection. Receive the information (step 300).

The voice delay information is information about a delay time from the time point at which the voice signal is transmitted to the voice output device 200 to the time point at which the actual voice is output.

The controller 110 adjusts the display time of the image or the transmission time of the audio signal using the voice delay information transmitted from the voice output apparatus 200 (step 310). For example, when the transmitted voice delay information indicates that a delay of 30 ms occurs in the voice output apparatus 200, the controller 110 determines that an image display time point on the display 120 is the voice output apparatus 200. It can be adjusted so that it delays 30ms from the point of time when the voice signal is transmitted to Accordingly, the image displayed on the display 120 and the audio output from the external audio output device 200 may coincide with each other.

The interface unit 130 transmits the voice signal to the voice output device 200 using the connected short range wireless communication in accordance with the voice signal transmission time adjusted by the controller 110 (step 320).

FIG. 5 is a flowchart illustrating a specific embodiment of the step of receiving voice delay information (step 300) of FIG. 4, wherein the interface unit 130 of the display apparatus 100 and the external voice output device 200 use Bluetooth. For example, connecting using

In general, short-range wireless communication schemes including Bluetooth require connection establishment to transmit and receive signals, and connection establishment for Bluetooth communication requires an inquiry procedure, a paging procedure, and a connection mode. The procedure of setting the mode) may be sequentially included. In the search procedure, external Bluetooth devices that can be connected to the master device are searched for, and in the paging procedure, a hopping sequence is synchronized using an address and clock information and the like to synchronize with the master device. Connect between the searched external devices. In the connection mode setting step, the master device determines whether to connect to the external device in which of a plurality of connection modes.

The voice delay information may be transmitted from the voice output device 200 in the short range wireless communication connection setting step between the interface unit 130 and the voice output device 200. More specifically, the voice delay information may be transmitted during the paging procedure. 200).

Referring to FIG. 5, the interface unit 130 included in the display apparatus 100 searches for external devices that can be connected through short-range wireless communication, for example, Bluetooth (step 301). When the external voice output device 200 is found in step 301, the interface unit 130 determines whether the searched external voice output device 200 supports voice delay information, that is, whether the voice delay information can be transmitted. (Step 302).

If the external voice output device 200 supports voice delay information, the interface unit 130 requests the voice output device 200 to transmit voice delay information (step 303).

The voice output device 200 receiving the transmission request transmits voice delay information, and the interface unit 130 receives voice delay information transmitted from the voice output device 200 (step 304).

Steps 302 to 304 may be performed during the paging procedure as described above, and since a voice signal must be continuously transmitted and received between the display apparatus 100 and the voice output apparatus 200, the connection mode after the paging procedure. In the setting step, the connection between the display apparatus 100 and the voice output apparatus 200 may be set to an active mode.

The voice delay information may be included in a packet transmitted from the voice output apparatus 200 to the interface unit 130 of the display apparatus 100 during the connection setting operation.

FIG. 2 illustrates an embodiment of a data format of a packet transmitted from the voice output device 200 to the interface unit 130 in the paging procedure. The voice delay is shown in the packet shown in FIG. Information may be included.

Referring to FIG. 2, the packet may include an access code (ACCESS CODE), a header (HEADER), and a payload portion including data, which indicates the start of packet information. The payload may be included in the payload portion and transmitted.

More specifically, the voice delay information may be included in an ACL packet (Asynchoronous Connection-Less packet) transmitted from the voice output device 200 to the interface unit 130, the voice using the undefined TYPE code of the ACL packet Delay information may be indicated.

3 is a block diagram illustrating an embodiment of the configuration of the controller 110 of FIG. 1, and the controller 110 may include a timing controller 111, a memory 112, and an image processor 113. .

The timing controller 111 receives the image data and the audio data so that the image displayed on the display 120 and the audio output from the speaker (not shown) inside the display device or the external audio output device 200 match. Each output time point is controlled and output.

The image data output from the timing controller 111 is stored in the memory 112 in a plurality of frame units, for example, 2 to 5 frames, for signal processing to be performed by the image processor 113.

The image processor 113 performs a predetermined image signal processing for improving image quality on the input image data by using the image data of the plurality of frames stored in the memory 112 and outputs the image signal to the display unit 120. For example, the image processor 113 may perform 3D comb filtering, frame rate conversion, or motion estimated compensation using image data of a plurality of frames stored in the memory 112. Can be done.

As described above, as image data of a plurality of frames are stored in the memory 112 and image signal processing is performed, when the image and audio data are simultaneously output from the timing controller 111, the image processor 113 displays the display unit. The image data outputted to the 120 is delayed by a time corresponding to a predetermined time t1, for example, the number of frames of the image data stored in the memory 112, compared to the audio data outputted from the timing controller 111.

Therefore, the timing controller 111 delays the audio data by the predetermined time t1 than the image data and outputs the same, thereby matching the image data displayed on the display 120 by the image processor 113. Accordingly, when the voice is output through a speaker (not shown) inside the display device, the image displayed on the display 120 and the voice input from the timing controller 111 coincide with each other and output from the speaker (not shown). can do.

However, when the voice data output from the timing controller 111 is transmitted to the external voice output device 200 through the interface unit 130 and outputted, the voice output generated by the voice output device 200 as described above. Due to the delay, the audio output may be delayed than the image displayed on the display 120.

Therefore, when the voice is output through the external voice output apparatus 200 connected by using short-range wireless communication, the timing controller 111 compensates the t1 by the voice output delay time generated by the voice output apparatus 200 and the image. By outputting data and audio data to the memory 112 and the interface unit 200, the image displayed on the display unit 120 and the audio output from the audio output device 200 may coincide with each other.

That is, assuming that the audio output delay time generated by the audio output device 200 is t2, the timing controller 111 outputs the image data to the memory 112 or the interface unit for a time corresponding to the difference between t1 and t2. The voice data output point to 200 may be delayed.

For example, after storing a plurality of frames of image data in the memory 112 and performing image signal processing, an image display delay of 40 Hz occurs, and the audio signal received from the audio output apparatus 200 is processed to Assuming that an audio output delay of 30 Hz occurs by outputting, the timing controller 111 may delay the audio data by about 10 Hz than the image data and output the delayed audio data.

In addition, assuming that a 30 ms video display delay occurs by the video signal processing and a 45 ms audio output delay occurs by the audio signal processing in the audio output apparatus 200, the timing controller 111 performs image data. Can be output with a delay of about 15 ms from the voice data.

The voice delay information on the voice output delay time t2 generated by the voice output device 200 may be transmitted from the voice output device 200 as described above. External voice output devices that may be connected to the display apparatus 100 using short-range wireless communication may have different voice delay times, and as described above, the image may be based on voice delay information transmitted from the voice output device 200. And by adjusting the output time of the audio data it is possible to synchronize the video and audio output more accurately according to the characteristics of each of the external audio output devices.

The voice data output from the timing controller 111 may be input to an internal speaker (not shown) or the interface unit 130 after a predetermined voice processing operation for improving sound quality is performed. Or very little time compared to the image processing operation.

The video and audio output synchronization method as described above can be applied to all display devices capable of outputting audio through a connected external audio output device using short-range wireless communication, and the display device according to the present invention is LCD, PDP, ELD. It may be a display device of various methods such as VFD.

FIG. 6 is a block diagram illustrating an embodiment of a configuration of an LCD liquid crystal display for performing the video / audio output synchronization method according to the present invention.

Referring to FIG. 6, the liquid crystal panel 400 may include a TFT substrate, a color filter substrate, and a liquid crystal layer interposed between the two substrates. The liquid crystal panel 400 may be disposed below the TFT substrate and above the color filter substrate. It may include polarizing sheets.

The TFT substrate includes gate lines, data lines, thin film transistors, and pixel electrodes. In addition, the gate lines extend in parallel with each other in the first direction. The gate lines receive gate signals for operating the thin film transistors.

The data lines extend in parallel to each other in a second direction, and receive data signals for displaying an image on the pixel electrodes and selectively transmit the data signals by an operation of the thin film transistors.

As shown in FIG. 6, the image data and audio data input from the outside may be separated from each other and processed through different paths, and the image data and audio data may be vertical sync signal VSYNC or horizontal sync signal HSYNC. It may be synchronized with each other by a synchronization signal including a.

The first timing controller 410 receives the image data and the synchronization signal, adjusts the output time point according to the synchronization signal, and outputs the image data to the memory 410. The image processor 430 outputs an image signal to the data driver 440 after performing a predetermined image signal processing operation using the image data of a plurality of frames stored in the memory 410.

The data driver 440 receives a control signal from the first timing controller 410, and converts an image signal input from the image processor 430 into the data signal, which is an analog signal, according to the control signal. Can be supplied as

The gate driver 450 may receive the control signal from the first timing controller 410 to generate the gate signals and supply the gate signals to the liquid crystal panel 400.

The second timing controller 460 receives the voice data and the synchronization signal, adjusts the output time point according to the synchronization signal, and outputs the voice data to the voice output unit 470 or the interface unit 450. For example, when the external voice output device (not shown) is connected, the voice data is output to the interface unit 450 and then transmitted to the voice output device (not shown) using short-range wireless communication. When the voice output device (not shown) is not connected, the voice output device 470 may be output to the voice output unit 470 and output through an internal speaker.

The first timing controller 410 or the second timing controller 460 may adjust the output time point of the image data or the output time point of the audio data by using the method described with reference to FIG. 5, and accordingly, the liquid crystal panel The image displayed at 400 and the audio output from the audio output unit 470 or an external audio output device (not shown) may coincide with each other.

In addition, the first and second timing controllers 410 and 460 may control the output timing of any one of the image data and the audio data to be delayed compared to the other output timing by the set time using the input synchronization signal.

For example, in order to make the image displayed on the liquid crystal panel 400 and the audio output from an external audio output device (not shown) coincide, the timing of outputting the audio data from the second timing controller 460 is the first timing. When the video data output from the controller 410 has to be delayed by a time corresponding to one frame, the second timing controller 460 may delay and output the audio data by one cycle of the input vertical sync signal VSYNC. Can be.

Meanwhile, the synchronization method according to the present invention may be implemented as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a block diagram illustrating an embodiment of a configuration of a display apparatus according to the present invention.

2 is a diagram illustrating an embodiment of a data format of a packet for transmission of time delay information.

3 is a block diagram illustrating an exemplary embodiment of the configuration of the controller of FIG. 1.

4 is a flowchart illustrating an embodiment of a video / audio output synchronization method according to the present invention.

FIG. 5 is a flowchart illustrating an embodiment of receiving voice delay information of FIG. 4.

6 is a block diagram illustrating an embodiment of a configuration of a liquid crystal display device to which a video / audio output synchronization method according to the present invention is applied.

Claims (15)

A display device for transmitting a voice signal to an external voice output device using near field communication, A display unit displaying an image; An interface unit configured to establish a short range wireless communication connection with the external voice output device to transmit and receive a signal with the external voice output device; And A controller for compensating a delay between the image displayed on the display unit and the audio output from the external audio output device by adjusting the display time of the video or the transmission time of the audio signal according to whether the external audio output device is connected. Display device comprising a. The method of claim 1, wherein the control unit And a display device configured to delay the display time of the image by a predetermined time when the external audio output device is connected. The method of claim 1, wherein the interface unit A display device for receiving voice delay information from the external voice output device. The method of claim 3, wherein the control unit And a display time of the image or a transmission time of the audio signal by using the received voice delay information. The method of claim 1, wherein the interface unit Display device for transmitting and receiving a signal using the Bluetooth communication with the external voice output device. The method of claim 5, wherein the interface unit A display device for requesting transmission of voice delay information to the external voice output device. The method of claim 5, wherein the interface unit And a display device configured to receive voice delay information from the external voice output device in a process of establishing a connection with the external voice output device. The method of claim 7, wherein the voice delay information is Display device included in an ACL packet (Asynchoronous Connection-Less packet) transmitted from the external voice output device. The method of claim 1, wherein the control unit A memory for storing image data; An image processor which processes image data stored in the memory and outputs the image data to the display unit; And A display apparatus including a timing controller configured to output image data and audio data input from an external device to the memory and the interface unit, and to adjust an output time point of the image data or the audio data according to whether the external audio output device is connected; . The method of claim 9, wherein the timing control unit And outputting the audio data by delaying the audio data by the first time than the image data when the external audio output device is not connected. The method of claim 10, When the external voice output device is connected, The interface unit receives voice delay information from the external voice device, and the timing controller delays and outputs the voice data or the image data by a difference between the first time and a second time corresponding to the voice delay information. Device. In the video / audio output synchronization method of the display device for transmitting a voice signal to an external audio output device using Bluetooth communication, Receiving voice delay information from the external voice output device; And And adjusting the image display time point of the display device to be delayed by a time corresponding to the received voice delay information than the transmission time point of the voice signal. The method of claim 12, Searching for the external voice output device; Checking whether the voice delay information of the searched external voice output device can be transmitted; And And requesting the voice delay information from the searched external voice output device when the voice delay information can be transmitted. The method of claim 13, And establishing a Bluetooth communication connection with the external voice output device, and receiving the voice delay information is included in the connection setting step. 15. The method of claim 14, wherein the voice delay information is Video / audio output synchronization method included in the ACL packet transmitted from the external audio output device.
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