KR100588168B1 - Method and apparatus for transmitting digital video and audio stream by digital interface - Google Patents

Abstract

The present invention relates to an apparatus and method for transmitting video and audio streams using a digital interface for transmitting and receiving video and audio data read from a disk recording medium such as a digital versatile disc through a digital interface such as IEEE 1394. Separating video data and audio data read from the recording medium; And transmitting the separated video and audio data to respective transmission channels using different communication protocols, which are read from a disc recording medium such as a DVD. By transmitting the video and audio data, in particular, LPCM audio data separately to the digital video display device and the digital audio device connected and connected through a digital interface such as IEEE 1394, a high-resolution video screen through the digital video display device and the digital It is a very useful invention to output high quality audio through an audio device at the same time.

Channel, video stream, audio stream, interface, DVD

Description

Apparatus and method for transmitting video and audio stream using digital interface {Method and apparatus for transmitting digital video and audio stream by digital interface}

1 illustrates an optical disk device, a digital video display device, and a digital audio device connected and connected through a digital interface.

 2 illustrates a configuration of an optical disk apparatus to which a video and audio stream transmission method using a digital interface according to the present invention is applied.

3 is a flowchart illustrating an operation of transmitting a video and audio stream using a digital interface according to the present invention.

4 illustrates a configuration of a transport format of a video data stream according to the present invention.

※ Explanation of code for main part of drawing

1: Optical disc 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: Navigation Manager

14 converter 15 IEEE 1394 interface

100: optical disk device 200: digital video display device

300: digital audio device

The present invention relates to an apparatus and method for transmitting video and audio streams using a digital interface for transmitting and receiving video and audio data read from a disk recording medium such as a digital versatile disc through a digital interface such as IEEE 1394.

The standardization of recently developed disc recording media, especially DVDs (DVD: Digital Versatile Disc, hereinafter referred to as DVD) is being quickly carried out among related companies, and it is expected that the spread of DVD will be widely spread in the future. Digital video display device capable of video display of, for example, digital satellite broadcasting or a digital television (D-TV: Digital TV, hereinafter referred to as D-TV) that displays the high-definition video of the DVD more clearly. ) Is expected to spread widely.

Accordingly, the use of the DVD player (or DVD recorder / player) for playing the DVD and the D-TV is expected to increase rapidly, and the communication standard of IEEE 1394 is required for data transmission between the devices. Employment is confirmed.

On the other hand, the DVD player divides an MPEG-type digital data stream, in particular, a program stream (hereinafter, referred to as a PS) into presentation (PT) data and navigation data (Navigation, NV). In processing, the presentation data PT is output as video and audio signals, and the navigation data NV is used to control the playback operation of the DVD player.

 However, unlike the DVD player, the D-TV processes video and audio signals by processing an MPEG data type digital data stream, in particular, a transport stream (hereinafter referred to as TS) as presentation data. Since the DVD player converts the PS into a TS and transmits the signal, or the D-TV converts the input PS into a TS and processes the signal.

Particularly, in the DVD player, to provide audio data of a linear pulse code modulation (LPCM) method recorded on the DVD, that is, various channels and high sound quality corresponding to eight channels. In order to convert LPCM audio data recorded and read out into an MPEG-Audio or AC3 format that can be signal-processed on a D-TV, the LPCM audio data that is read from the DVD is decoded and then MPEG- capable of signal-processing on the D-TV. It must be re-encoded into an audio or AC3 format audio stream and sent to the D-TV via a digital interface such as IEEE 1394.

However, the D-TV is a digital image display device developed for high resolution digital image display, and is provided with a separate means for signal processing of LPCM audio data recorded and read to provide various channels and high sound quality. You may not.

Therefore, in the above case, there was a problem that the D-TV can not hear the multi-channel high-quality audio output by the LPCM audio data.

Accordingly, the present invention has been made to solve the above problems, and the video and audio data, particularly LPCM audio data, which are read from a disc recording medium such as a DVD, are connected and connected through a digital interface such as IEEE 1394. Video and audio streams are transmitted using a digital interface that separately outputs a high-definition video screen through the digital video display device and high-quality audio through the digital audio device by separately transmitting the digital video display device and the digital audio device. It is an object of the present invention to provide an apparatus and method.

A video and audio stream transmission method using a digital interface according to the present invention for achieving the above object comprises the steps of: separating the video data and audio data read from the disk recording medium; And transmitting the separated video and audio data to respective transmission channels using different communication protocols.

In addition, an apparatus for transmitting video and audio streams using a digital interface according to the present invention comprises: separating means for separating video data and audio data from a data stream read from a disc recording medium; Conversion means for converting the separated video and audio data into respective transport streams corresponding to different communication protocols; And transmission means for transmitting each of the converted transport streams to transport channels having different paths.

The apparatus and method for transmitting a video and audio stream using the digital interface according to the present invention as described above comprises separating a data stream read from a disc recording medium such as a digital DVD into video and audio data, in particular LPCM audio data, and Converts the separated video and audio data into a transmission data stream in a transmission format for transmission respectively to a digital video display device and a digital audio device connected through a digital interface such as IEEE 1394, and converts each of the converted video and audio data streams. By transmitting to a transmission channel having a different transmission path, a high-definition video screen through the digital video display device and high-quality audio through the digital audio device is output at the same time.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 1 shows a DVD player 100, a digital video display device 200, and a digital audio device 300 to which a video and audio stream transmission method using a digital interface according to the present invention is applied. The digital audio device 300 is a signal of the LPCM audio data read out from the DVD as described above, that is, the LPCM audio data read out from the DVD to provide various channels and high sound quality as described above. It is a professional audio device equipped with a constituent means for processing, the digital image display device 200 is a high-definition digital is provided with a constituent means for signal processing the video data read from the DVD to a high-resolution digital video screen It is a video display device.

On the other hand, the DVD player 100, as shown in Figure 2, the optical disk (1); An optical pickup (P / U) 2 for reading recorded data from the optical disc; A demodulator for demodulating and error correcting the read data; A scrambler (Scrambler or Copy Protect System (CSS)) 4 for adding a copy protection code to the output data of the demodulator; A selection output unit for selecting an output path of the data to which the copy protection code is added; The data stream input from the selective output unit, that is, the program stream, is divided into presentation data (PT), and navigation data (NV: Navigation, hereinafter NV). A data separator for separating / outputting the data into audio, video, and sub picture data; Respective decoders (7, 8, 9) for decoding the 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 for converting and outputting the digital audio signal and the video signal into analog video and audio signals, respectively; A navigation manager 13 for receiving an NV data separated from the data separator 6 and controlling the read operation of the optical disc to perform an operation corresponding to a user's key input; A converter (14) for converting the output data output from the selective output unit (5), that is, the program stream (PS) into a data stream of a corresponding transmission format of the connected device; IEEE 1394 interface unit 15 for transmitting the converted data stream, the operation description of the DVD player 100 is configured as described above, the program stream (read and processed from the optical disc 1) ( PS) is separately outputted as audio, video and sub-picture data by the data parser 6 to the decoders 7, 8, 9, presentation engine 10 and D / A converter. When the program stream PS is inputted to the converter 14 by the selective output unit 5, the converter 14 receives the inputted program stream PS. The stream identifier Stream_ID is decoded to be decoded, and the navigation data NV included in the program stream PS, in particular, program specification information PSI, which is information for controlling program reproduction, and audio and video signals. Pre It separates the separation of the presentation data (PT), and a system clock data (SCD), respectively.

The separated program specification information (PSI) and system clock data (SCD) are used as information and a system clock for controlling program reproduction, and the presentation data (PT) is separated into audio and video data, and the digital interface The digital image display apparatus S200 and the digital audio apparatus 300 are respectively converted into data streams capable of signal processing, and the audio data streams and video data streams converted into different formats are respectively provided in the IEEE 1394 interface unit. The digital image display apparatus S200 and the digital audio apparatus 300 are transmitted through the reference numeral 15.

Accordingly, the digital image display apparatus S200 displays a high quality digital image screen, and the digital audio apparatus 300 outputs high quality audio according to signal processing of LPCM audio data. The data stream conversion and transmission operations will be described in detail below with reference to the accompanying drawings.

3 is a flowchart illustrating a video and audio stream transmission method using a digital interface according to the present invention. First, in a DVD player 100, a digital image display apparatus 200 is provided through a digital interface such as IEEE 1394. And the data transmission mode for transmitting the data stream read from the optical disc 1 to the digital image display apparatus 200 and the digital audio apparatus 300 while the digital audio apparatus 300 is connected to the digital audio apparatus 300. S10), the recording data recorded on the optical disc 1 is read out (S11), and the read data are separated into video and audio data, wherein the separated data is audio, in particular, LPCM audio data (S12). 2, the data stream of the corresponding transport format is converted (S13) using the IEC61883-6 communication protocol.

On the other hand, if the separated data is not audio data, that is, video data, it is converted to a data stream of a corresponding transmission format using the IEC61883-4 communication protocol shown in FIG. 2 (S15), and each different as described above. The video data stream and the audio data stream converted into the transmission format are transmitted to the digital video display apparatus 200 and the digital audio apparatus 300 connected and connected through the IEEE 1394 interface (S14 and S15), respectively.

On the other hand, the transmission data stream using the IEC61883-4 communication protocol to transmit the video data stream to the digital image display apparatus 200, as shown in Figure 4, composed of source packet header information and the application packet recording area In the application packet recording area, a sync byte for synchronizing sync with an audio stream output through another transmission path is recorded.

In addition, the CIP (Connection Isochronous Packet) header of the MPEG2 Transport Stream (TS), which is a data stream that can be processed by the digital image display apparatus 200, includes information for identifying a source node provided with a transport stream ( SID: Source node ID); Information indicating a block size of a transport stream (DBS: Data Block Size in quadlets); When the size of the transport stream is large, serial number information (FN: Fraction Number) of the separated transmission data, which is separated and transmitted; Information indicating the number of padding data padded to separate the transport stream into even blocks (QPC: Quadlets Padding Count); Source packet header information (SPH); Information indicating the number of current transmission data blocks to be transmitted separately (DBC: Data Block continuity counter); Information field consisting of a transmission format identifier (FMT: Format ID) and information indicating whether the transmission data is real time data or transmission data stored on a recording medium and having a time delay, and a free area. (FDF: Format Dependent Field).

For reference, the format of the IEC61883-6 communication protocol used for transmitting LPCM audio data to the digital audio device 300 is currently being standardized among related companies.

As described above, in the DVD player 100, video data and LPCM audio data read from a disc recording medium such as a DVD is connected to the digital image display apparatus 200 and the digital audio apparatus 300 connected through a digital interface. In order to transmit, they are converted into different transmission formats and transmitted.

The apparatus and method for transmitting a video and audio stream using the digital interface according to the present invention as described above comprises a digital interface such as IEEE 1394, video and audio data read out from a disk recording medium such as DVD (DVD). It is a very useful invention to simultaneously output a high resolution video screen through the digital video display device and a high quality audio through the digital audio device by separately transmitting to the digital video display device and the digital audio device connected through the connection. .

Claims (7)

Setting a mode for separately transmitting video data and audio data read from the disc recording medium to the digital video display device and the digital audio device, respectively; After separating the video data and audio data read out from the disc recording medium, the video data is converted into a data stream of a corresponding transmission format using a first communication protocol, and the audio data is converted into a second communication. Converting to a data stream of a corresponding transport format using a protocol; And And a three step of separately transmitting the converted video data stream and the audio data stream to the digital video display device and the digital audio device through transmission channels of different paths. Video and audio stream transmission method using. The method of claim 1, The first communication protocol is an IEC61883-4 communication protocol, and the second communication protocol is an IEC61883-6 communication protocol. The method of claim 1, The transmission channel is a video and audio stream transmission method using a digital interface, characterized in that the isochronous transmission channel (Isochronous Channel) having a different transmission path. Separating means for separating the data stream read out from the disc recording medium into video data and audio data; The separated video data is converted into a data stream of a corresponding transport format using a first communication protocol, and the audio data is converted into a data stream of a corresponding transport format using a second communication protocol. Way; And And a transmission means for transmitting the converted video data stream and the audio data stream to the digital video display apparatus and the digital audio apparatus through transmission channels of different paths, respectively. Video and audio stream transmission device. The method of claim 4, wherein The transmission means transmits the converted video and audio transport streams to the digital video display device and the digital audio device through an isochronous transport channel having different paths, respectively. And an audio stream transmitter. The method of claim 4, wherein The audio data is a video and audio stream transmission apparatus using a digital interface, characterized in that the audio data of a linear pulse code modulation (LPCM) method for providing a plurality of channels and high quality sound. The method of claim 6, And the digital video display device is a digital television which is not provided with a constituent means for signal processing audio data of the linear pulse code modulation (LPCM) method.

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