KR100578245B1 - Method for transmitting audio data through digital interface - Google Patents

Abstract

The present invention relates to a method of transmitting audio data through a digital interface, the method comprising: requesting attribute information of a connected device connected and connected through a digital interface; And transmitting the audio data of a predetermined attribute to a connection device through the digital interface when the requested attribute information is not received, and digitally connected through a digital interface such as IEEE 1394. When the attribute information of a digital connection device such as a television is not received, the DVD device transmits audio data of a predetermined attribute, such as 2-channel audio data of a linear pulse code modulation (LPCM) method, and guides it. By outputting the message, the user can easily check and change the property of the audio data transmitted from the DVD device, so that audio data transmission of the property suitable for a connected device such as a digital television and normal audio output can be made accordingly. Very useful inventor will be.

Digital interface, attribute information, descriptors, announcement messages, LPCM-2 channel audio

Description

Method for transmitting audio data through digital interface {Method for transmitting audio data through digital interface}

1 illustrates a plurality of connection devices connected and connected through a digital interface such as IEEE 1394,

2 is a block diagram of a DVD device and a digital television to which an audio data transmission method through a digital interface according to the present invention is applied.

3 is a flowchart illustrating an operation in a DVD device to which an audio data transmission method through a digital interface according to the present invention is applied.

4 and 5 illustrate a guide message screen of audio data according to the present invention.

※ Explanation of code for main part of drawing

1: DVD 2: Optical pickup (P / U)

3: demodulation unit 4: scrambler

5: Selective output unit 6: Data separation unit

7,8,9: Decoder 10: Presentation Engine

11,12: D / A converter 13,22: Microcomputer

14 PS / TS converter 15,21 IEEE 1394 interface

16,29: memory 23: Demux

24,25: Decoder 26,27: D / A Converter

28: on-screen display unit 30: synthesizer

100: DVD device 200: Digital Television

300: Digital VR 400: Set Top Box

500: digital audio

The present invention relates to a DVD device for transmitting audio data read out from a disk recording medium such as a DVD (Digital Versatile Disc) to a digital connection device such as a digital television connected and connected via a digital interface such as IEEE 1394. The present invention relates to a method of transmitting audio data through a digital interface.

First, FIG. 1 illustrates a plurality of connection devices connected and connected through a digital interface such as IEEE 1394. In a digital interface such as IEEE 1394, high-definition digital video or high-quality digital audio from a disk recording medium such as a DVD is shown. DVD device 100 that can play; A digital V 300 capable of reproducing high quality digital video or high quality digital audio from a magnetic recording medium such as a digital video tape; A set top box (STB) 400 for receiving a digital broadcast signal and transmitting the same to a connected device; A digital television (200) for visually displaying and outputting high-definition video and high-quality audio received from digital satellite broadcasting reception or the DVD device and digital TV; And a digital audio device 500 for reproducing and outputting high-quality digital audio may be connected and connected. For example, the DVD device 100 and the connected device are connected and connected through a digital interface such as IEEE 1394. Data transmission between the digital television 200 and its operation control will be described below.

First of all, DVD, a recently developed disk recording medium, is rapidly being standardized among related companies, and is expected to be widely spread as a multifunctional video disk recording medium in the future. Digital television 200, which is a display device, can display digital satellite broadcasting and digital high-definition video on a clearer picture screen, and is expected to be widely spread with the DVD device 100.

Accordingly, the use of the DVD device 100 for playing the DVD and the digital television 200 by connecting and using the digital interface such as IEEE 1394 is expected to increase rapidly.

On the other hand, in the DVD device 100, the digital data stream of the MPEG (MPEG) method, in particular, the program stream (PS: Program Stream) is divided into a presentation (PT) data and navigation data (NV: Navigation) The presentation data PT is output as a video and audio signal, and the navigation data NV is used for controlling a playback operation of a DVD device.

However, in the digital television 200, unlike the DVD device 100, the transport stream (TS) of the digital data streams of the MPEG (MPEG) method is signal-processed as the presentation data (PT) to display an image and Since the audio signal is output, the program stream PS received from the DVD device 100 is converted into a transport stream TS for signal processing, or the program stream PS is output from the DVD device 100. It must be converted into a transport stream (TS) and transmitted to the digital television 200.

As described above, in the DVD device 100, the digital data stream read and reproduced from a disc recording medium such as a DVD (DVD) is transmitted to the digital television 200 through a digital interface such as IEEE 1394, and the digital television 200 In the present invention, the digital data stream transmitted from the DVD device 100 is output through the digital interface as a high-definition digital video screen and high-quality digital audio. The operation control of the DVD device 100 is performed in accordance with IEEE 1394. It can be controlled remotely on the digital television 200 connected through the digital interface, or directly on the DVD device 100.

However, in the case of DVD, a multi-functional video disc recording medium, multiple titles can be recorded and stored on one disc, and various resolutions and display modes (eg, 4: 3) for each title can be recorded. , Additional data to support 16: 9, Pan-scan, letter box), audio (LPCM, AC3, MPEG2, MPEG1), number of audio channels, etc. Disc type information indicating that the disc is a single-sided disc or the like is recorded and stored together. In addition, various types of information and data for providing new functions and additional information are additionally recorded to have various characteristics for each DVD.

Accordingly, the recently developed DVD device 100 is further equipped with new functions and configurations such that various playback operations using the plurality of titles, additional data, and information recorded on the DVD, and data processing thereof are all performed. It is true.

However, in the digital television 200 connected and connected to the DVD device 100 through a digital interface such as IEEE 1394, as well as the recording characteristics of the DVD in which various additional information and data are additionally recorded as described above, the DVD The processing capability corresponding to the data processing capability and the operating characteristics of the apparatus 100, that is, the DVD and the processing capability for various video display and audio output corresponding to the characteristics of the DVD apparatus 100 may not be provided. In low-cost digital televisions, attribute information on data processing capability and operation characteristics, etc. may not be stored separately, or a negotiation function with a DVD device for requesting and receiving the attribute information may not be provided.

Accordingly, there is a problem that video and audio data normally reproduced and output from the DVD or the DVD device 100 are frequently distorted and abnormally displayed and output on a digital connection device such as the digital television 200.

Accordingly, the present invention has been made to solve the above problems, and requests and receives attribute information of a connected device such as a digital television connected and connected through a digital interface such as IEEE 1394, and transmits data corresponding to the attribute information. In particular, the present invention provides a method of transmitting audio data through a digital interface in a DVD device such that audio data transmission is performed and, when the attribute information is not received, transmission of audio data suitable for the same is performed. Is there.

According to an aspect of the present invention, there is provided a method of transmitting audio data through a digital interface, the method comprising: requesting attribute information of a connected device connected and connected through a digital interface; And when the requested attribute information is not received, transmitting the audio data of the preset attribute to the connected device through the digital interface.

In addition, in the second step, when the requested attribute information is not received, the audio data transmitted to the connected device is set to 2 channel audio data of a linear pulse code modulation (LPCM) method. (B) transmitting audio data.

Hereinafter, exemplary embodiments of a method of transmitting audio data through a digital interface according to the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 2 illustrates a configuration of a DVD device 100 to which an audio data transmission method through a digital interface according to the present invention is applied and a digital television 200 which is one of a digital connection device. The DVD device 100 An optical pickup (P / U) 2 which reads out data stored in the DVD (DVD) 1; A demodulator (3) for demodulating and error correcting the read data; A scrambler or copy protect system (CSS) 4 for adding a copy protection code to the output data of the demodulator 3; A selection output unit (5) for selecting an output path of data to which the copy protection code is added; The data stream input from the selective output unit 5, that is, the program stream, is divided into presentation data PT and navigation data NV, and the divided presentation data PT is again divided into audio, video, and sub-pictures. A data separator 6 for separating and outputting picture data; Respective decoders (7, 8, 9) for decoding said separated audio, video and sub-picture data; A presentation engine (Engine) 10 for combining the decoded audio, video and sub-picture data to output a digital audio signal and a video signal; D / A converters 11 and 12 converting the digital audio signal and the video signal into analog video and audio signals, respectively; The playback operation is performed according to the navigation data (NV) divided and outputted separately from the data separator (Parser) and the attribute information of the digital television 200 or the user's key input received through the digital interface. A micom 13 for selectively controlling; A memory 16 for storing data necessary for a control operation of the microcomputer 13; A PS / TS converter 14 for converting output data output from the selective output unit 5, that is, program stream PS into a transport stream TS; And an IEEE 1394 interface unit 15 for transmitting the converted transport stream (TS),

The digital television 200, the IEEE 1394 interface unit 21 for transmitting and receiving data with the DVD device 100; A demux 23 for demuxing and transporting the transport stream TS received from the interface unit 21 into audio and video data; Decoders 24 and 25 for decoding the separated / output audio and video data and outputting them as digital audio and video signals, respectively; D / A converters (26, 27) for converting / outputting the digital audio and video signals into analog audio and video signals; A microcomputer 22 for outputting an operation control signal in response to a user's key input and for searching and transmitting and controlling attribute information required by the DVD device 100; An On Screen Display (OSD) 28 for outputting a guide message transmitted from the DVD device 100 as a text image; A synthesizer 30 for synthesizing and outputting a text image to the video signal; And a memory 29 for storing data and attribute information necessary for outputting the control signal of the microcomputer 22.

In addition, FIG. 2 illustrates a user key input unit 50 for controlling operations of the DVD device 100 and the digital television 200. For reference, a PS / TS converter of the DVD device 100 may be used. 14 may be alternatively provided inside the digital television 200 or may be configured by an external connection configuration means in the form of an adapter, and the DVD device 100 and the digital television 200 configured as described above may be replaced. In particular, the audio data transmission operation in the DVD device for transmitting audio data through the digital interface will be described in detail as follows.

First, FIG. 3 is a flowchart illustrating an operation of transmitting audio data in the DVD device 100 to which the audio data transmission method through the digital interface according to the present invention is applied. The power is turned on in the DVD device 100. When the power is turned on or when a reset occurs on the digital interface bus such as IEEE 1394 (S10), the microcomputer 13 is connected to a peripheral device, that is, digital, connected through an IEEE 1394 interface. The connection state with the connection device such as the television 200 is checked (S11).

As a result of the confirmation, when the digital television 200 is connected and connected through the IEEE 1394 interface, the attribute information including all the information about the processing capability for the video display and the audio output of the digital television is requested (S12). .

The request operation of the attribute information is to determine whether the data stream to be transmitted from the DVD device 100 is normally displayed and output on the digital television 200 before the playback operation. The DVD device 100 The microcomputer 13 of the digital television 200 transmits an attribute information request signal or command to the microcomputer 22 of the digital television 200 connected and connected via the IEEE 1394 interface unit 15. The device 22 searches for and reads descriptor information stored in the memory 29, that is, descriptor information in which all attribute information for video data processing and audio data processing of the digital television is recorded and stored, and the DVD device 100 is read. Is transmitted to the microcomputer 13, and the memory of the digital television 200 is used to process video data and audio data as described above. A property may not be information is not stored, or saved.

That is, in the case of a low-cost digital television manufactured to simply display and output high definition video and high quality audio, attribute information on video and audio data processing capability and operation characteristics is not stored separately, or the attribute information. Negotiation with the device for requesting and receiving the device may not be provided.

Accordingly, in the microcomputer 13 of the DVD device, after the attribute information request, the attribute information is normally received or not received from the digital television 200. When the information is normally received (S13), the attribute information received from the digital television is stored in the memory 16 (S14), and when a playback operation is received from the user (S15), the requested playback operation is stored. The attribute information of the digital television 200 stored in the memory 16 is searched for and confirmed (S16), and the identified attribute information, for example, audio data of a format that can be processed by the digital television is transmitted through an IEEE 1394 interface. By transmitting (S17), normal audio is output from the digital television.

On the other hand, when the attribute information is not received, the attribute information of the digital television 200 is not stored separately, or the low-cost type does not have a negotiation function with a DVD device for requesting and receiving the attribute information. If it is determined that it is a digital television and a playback operation is received from the user (S18), audio data of a format preset in the memory 16 of the DVD device 100 prior to the requested playback operation, for example, linear In addition to transmitting 2 channel audio data of linear pulse code modulation (LPCM) method as low audio data (S19), a guide message for guiding this is output, and the guide message is digital. To indicate that the transmitted audio data transmitted to the television is linear channel code modulation (LPCM) type 2 channel audio as described above. As such, it may be displayed on the LCD display window provided in the DVD device 100, or as shown in FIG. 4, through the screen of the connected and connected digital television through the digital interface.

Accordingly, the user can easily check the property of the audio data transmitted from the DVD device 100 through the screen of the digital television that he is watching, so that normal audio data is not output from the digital television currently being viewed. In this case, it is possible to request to change transmission to the transmission audio data of another attribute (S21).

For example, the transmission audio data is changed from linear channel code modulation (LPCM) two-channel audio to AC3 audio data through an on-screen guide message as shown in FIG. 4, or amppack 2 audio or amppack. It is possible to request a change to one audio (S22).

Therefore, when the user does not have a normal audio output on the digital television watched by the user, the user can request to change the audio data transmitted from the DVD device 100 to the audio data of another property, and eventually the digital television Will enable normal audio output.

For reference, when the digital television 200 does not normally process the audio data transmitted from the DVD device, as illustrated in FIG. 5, a guide message for notifying the audio data and audio having a property capable of signal processing in the digital television may be used. A guide message indicating data may be displayed on a screen so that the user may change the audio data transmitted from the DVD device to audio data of another property after confirming this.

On the other hand, the DVD device for transmitting audio data as described above, as described above can be connected to a variety of digital connection devices through a digital interface, for example, when connected to a digital audio device that can not display video In addition, the guide message may be replaced with a voice message, and the audio data transmission operation as described above may be performed even when attribute information of the connected device cannot be received due to a transmission error of the digital interface.

As mentioned above, preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. It may be possible to substitute, add, or otherwise.

In the audio data transmission method through the digital interface according to the present invention as described above, when the attribute information of a digital connection device such as a digital television connected and connected through a digital interface such as IEEE 1394 is not received, a linear pulse is received from the DVD device. By transmitting audio data of a predetermined property, such as 2-channel audio data of code modulation (LPCM) method, and outputting and displaying a guide message for guiding this, the user can easily attribute the audio data transmitted from the DVD device. Since it is possible to check and change, it is possible to use a low-cost digital television which does not have separately stored attribute information on audio data that can be processed in a digital television, or which does not have a negotiation function for requesting and receiving the attribute information. Device and It is a very useful invention to allow audio data transmission of a property suitable for a connected device such as a digital television and thus a normal audio output even when a connection is used or an error occurs in a digital interface.

Claims (13)

Transmitting attribute information including information relating to a format of data that can be processed to an external system capable of transmitting and / or receiving digital data via a digital interface; Receiving data of a format according to the transmitted attribute information from the external system; And And storing and / or processing the received corresponding data. delete The method of claim 1, And the attribute information is information stored in a memory means. The method of claim 1, And the received data is data whose format is converted or unformatted according to the attribute information. The method of claim 1, And receiving information related to a format of the received data. The method of claim 1, And said digital interface is an IEEE1394 interface. Interface means for transmitting and / or receiving data via a digital interface; Transmits attribute information including information relating to a format of data that can be processed to an external system capable of transmitting and / or receiving digital data via the interface means, and transmits data of a format according to the transmitted attribute information from the external system; And control means for receiving and storing and / or processing the received corresponding data. delete The method of claim 7, wherein And memory means for storing said attribute information. The method of claim 7, wherein And the received data is data whose format is converted or unformatted according to the attribute information. The method of claim 7, wherein And receiving information related to a format of the received data. The method of claim 7, wherein And data display and / or audio output means for outputting the information. 8. The apparatus of claim 7, wherein the digital interface is an IEEE 1394 interface.

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