KR19980078979A - How to Guide Audio Coding Modes for Digital Video Disc Players - Google Patents

Abstract

The present invention relates to a method of guiding an audio coding mode of a digital video disc player, the method comprising: (a) playing a video title set (VTS) when an audio guiding mode is set, and (b) video title set information in the VTS. (C) reading a video title set information management table (VTSI_MAT) in the VTSI, (d) reading a VTS_AST-ATRT (audio stream attribute table of VTS) in the VTSI_MAT; (E) reading the audio coding mode recorded in the VTS_AST_ATR in the VTS_AST_ATRT, and (f) displaying the audio coding mode read in step (e) and generating a guide sound accordingly.

Therefore, the present invention has the effect of enabling the user to set an appropriate audio output mode and a peripheral device for audio output by reading and informing the user of the coding mode of the audio data recorded on the disc.

Description

How to Guide Audio Coding Modes for Digital Video Disc Players

The present invention relates to a digital video disc player, and more particularly, to a method of guiding an audio coding mode of a digital video disc player, which can determine a coding mode of audio data recorded on a disc to be played back and inform the user.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. There is a trend.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player) has been developed and widely used. Also, recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for playing the same have been developed. It can record and play back gigabytes (GB) of data including moving images on a 12cm optical disc such as a CD, and it is also designed to be compatible to play current CDs and VCDs.

On the other hand, audio data recorded on a DVD for a DVD player as described above is generally recorded as data encoded in a Dolby AC-3 method developed by Dolby, but in some cases MPEG- without extended bit streams is recorded. It can be recorded in 1 or MPEG-2 format, MPEG-1 or MPEG-2 format with extended bit stream, PCM format, etc., and each encoding scheme must set an appropriate audio output mode for each case to listen to normal audio. Since the user can use the DVD player, the audio output mode and the peripheral audio device must be set according to the encoding method of the audio data recorded on the disc so that normal audio can be heard.

However, in the conventional DVD player as described above, the user may not know the encoding method of the audio data recorded on the disc, which may cause user confusion and difficulty in setting an appropriate audio output mode.

Accordingly, the present invention has been made to solve such a problem in the related art, and an object of the present invention is to allow a user to recognize an encoding scheme of a user by encoding audio data recorded on the disc in playing a predetermined disc in a digital video disc player. The present invention provides a method of guiding an audio coding mode of a digital video disc player, so that an audio output mode can be set appropriately.

According to a preferred embodiment of the present invention for achieving the above object, in the audio coding mode guidance method of the digital video disc player for recognizing and outputting the encoding mode of the audio data recorded on the disc to be reproduced in the digital video disc player (I) playing a video title set (VTS) when the audio guidance mode is set, (b) reading and storing video title set information (VTSI) in the VTS, and (c) VTSI_MAT (in the VTSI); reading a video title set information management table, (d) reading a VTS_AST_ATRT (audio stream attribute table of VTS) in the VTSI_MAT, and (e) reading an audio coding mode recorded in the VTS_AST-ATR in the VTS_AST-ATRT. And (f) display the audio coding mode read in step (e) and generate a guide sound accordingly. It includes a step.

1 is a schematic block diagram of a general digital video disc player for practicing the present invention;

2 to 4 are diagrams for explaining the format of data recorded on a digital video disc;

5 is a detailed flowchart illustrating a method of guiding an audio coding mode of a digital video disc player according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of drawings *

10: microcomputer 12: memory

15: Optical pickup unit 20: RF amplifier and focus / tracking error detection unit

25: servo signal processing unit 30: motor and motor drive unit

35: digital signal processor 40: MPEG-2 decoder

45: header decoder 50: AC-3 decoder

55: audio signal processor 60: video signal processor

65: speaker 70: screen

D: Disk

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

1 is a schematic block diagram of a digital video disc player for practicing the present invention.

As shown in Fig. 1, a digital video disc player for implementing the present invention includes a key input unit 5, a microcomputer 10, a memory 12, an optical pickup unit 15, an RF (radio frequency) amplifier and a focus. / Tracking error detector 20, servo signal processor 25, motor and motor driver 30, digital signal processor 35, MPEG-2 decoder 40, header decoder 45, AC-3 A decoder 50, an audio signal processor 55, a video signal processor 60, a speaker 65, and a screen 70 are included.

The operation of the DVD player constructed as described above is as follows.

The optical pickup unit 15 performs optical pickup from the disk D loaded in the disk tray (not shown), and outputs an RF signal read out accordingly.

In addition, the motor and the motor driving unit 30 drive the spindle motor (not shown) to rotate the disk D, and drive the pickup transport motor (not shown) so that the optical pickup unit 15 performs optical pickup. To read the data recorded on the disk D and output it as an RF signal.

The RF amplifier and tracking / focus error detection unit 20 amplifies the RF signal provided from the optical pickup unit 15 and provides it to the digital signal processing unit 35. The RF signal and the tracking / focus error detection unit 20 also detect the focus and tracking error signals from the signal, and then the servo signal. It is provided to the processing part 25.

The servo signal processor 25 provides a servo signal according to the focus and tracking error signals provided from the RF amplifier and the tracking / focus error detector 20 to the motor and the motor driver 30, respectively, through the optical pickup unit 15. The light causes tracking and focus servo to occur on the disc D.

The digital signal processing unit 35 performs digital signal processing on the amplified RF signal provided from the RF amplifier and the tracking / focus error detection unit 20 and performs error detection and error correction. 2 is output to the decoder 40.

Meanwhile, the header decoder 45 separates header information excluding MPEG video and audio data from the digital signal provided by the digital signal processor and provides the header information to the MPEG-2 decoder 40.

The MPEG decoder 40 converts digital data in the form of a bit stream from which the error correction is provided from the digital signal processor 35 through the header decoder 45 and the header information is separated into a video signal and an audio signal. After separation, the audio signal is output to the AC-3 decoder 50, and the video signal is decoded based on the MPEG-2 compression format and then output to the video signal processor 60.

On the other hand, the AC-3 decoder 50 decodes the audio signal encoded by the Dolby AC-3 method provided from the MPEG-2 decoder 40 and provides it to the audio signal processor 55, the audio signal processor ( 55 converts the decoded audio signal provided from the AC-3 decoder 50 into an audio signal processing and an analog signal and outputs the speaker 65.

The video signal processing unit 60 outputs the decompressed and decoded video signal provided from the MPEG-2 decoder 40 to the screen 70 after being processed.

The key input unit 5 provides a function key signal for executing a predetermined function in the DVD player, and the microcomputer 10 transmits a control signal according to the key signal provided from the key input unit 5 to the respective components. In addition, the key input unit 5 further includes an audio recording mode guide key (not shown) in addition to the general function key. The memory 12, ie, the SRAM 12, stores predetermined information data provided from the microcomputer 10 under the control of the microcomputer 10, and also outputs the stored data to the microcomputer 10 to output the microcomputer 10. ) Can refer to this.

On the other hand, according to the present invention, when the audio guide key signal is input from the key input unit 10, the microcomputer 10 through the header information provided from the header decoder 45, as shown in FIG. If the area is being regenerated, at this time, if the VTS is not being regenerated, a control signal is generated by the motor and the motor driving unit 15 to transfer the optical pickup unit 15 to the VTS area so as to regenerate the VTS area.

When the VTS region is reproduced as described above, the microcomputer 10 stores the header information provided separately from the header decoder 45 in the memory 12 and sequentially reads them to recognize the audio coding mode. The pre-stored text data for guiding the recognized audio mode is provided to the video signal processing unit 60, and the pre-stored audio data for guiding the recognized audio mode is provided to the audio signal processing unit 55 to display the screen 70. And a speaker 65 to be transmitted as a display and voice as a character.

2 to 4 are diagrams showing the format of data recorded on a digital video disc.

2 to 4, the data area recorded on the disc is divided into a volume and file structure area and a DVD video area, and the DVD is divided into DVDs. The video area is divided into a VMG (video maneager) area and n video title set (VTS) areas, and each VTS area includes a video title set information (VTSI) area.

As shown in FIG. 3, the VTSI region includes a video title set information management table (VTSI_MAT) region. Furthermore, VTS_AST_ATRT (audio stream attribute table of VTS) data is recorded in the 516th to 579th bytes of the VTSI_MAT area, that is, 64 bytes. This VTS_AST_ATRT region is divided into eight VTS_AST_ATR regions allocated by 8 bytes.

In addition, as shown in Fig. 4, data for an audio coding mode is recorded in each VTS_AST_ATR region.

On the other hand, this audio coding mode data indicates that it is coded with Dolby AC-3 when 000b, 010b indicates that it is coded with MPEG-1 or MPEG-2 without an extension bit stream, and 0-1 with MPEG- with extension bit stream. When 1 or MPEG-2, 100b, it indicates that the data has been coded with linear PCM audio data.

That is, according to the present invention, when the disc is reproduced, the microcomputer 10 refers to the audio coding mode data among the header information provided separately from the header decoder 45, and accordingly the microcomputer 10 records the audio recorded on the disc. The audio coding mode is guided by determining a coding mode and outputting preset data according to the audio coding mode.

5 is a detailed flowchart illustrating an audio coding mode guiding method of a digital video disc player according to an exemplary embodiment of the present invention.

In step S10, it is determined whether the audio guide mode. That is, in step S10, the microcomputer 10 determines whether an audio guide mode key signal is input from the key input unit 5 or previously set to the audio guide mode. In step S10, if it is the audio guide mode, the flow advances to step S20, otherwise the flow is fed back.

When the process proceeds from step S10 to step S20, it is determined whether the VTS area is being played back in step S20. If the VTS is being played back in step S20, the process proceeds directly to step S40. In operation S30, the microcomputer 10 generates a control signal to the motor and the motor driving unit 30 to transfer the optical pickup unit 15 to perform the regeneration of the VTS region, in operation S40. Proceed to).

Then, in step S40, the VTSI area in the VTS area is read and stored. In step S50, the VTSI_MAT area in the VTSI area is read out, and the flow proceeds to step S60 after reading the VTS-ART-ATRT area in the VTSI-MAT area, and then proceeds to step S70.

Thereafter, in step S70, the audio coding mode data recorded in the VTS_ART_ATR of VTS_ART_ATRT is read out and the process proceeds to step S80.

Then, in step S80, it is determined whether the audio coding mode data read in step S80 is 000b, that is, Dolby AC-3. If the audio coding mode data read in step S70 is 000b, step S90. Proceeding to the guide sound, for example, three buzzer sounds are generated through the speaker 65, and at the same time, the screen 70 displays Dolby AC-3 as text.

On the other hand, if the audio coding mode read in step S80 is not Dolby AC-3, the flow advances to step S100 to determine whether the MPEG mode has no extended bit stream, that is, whether the read data is 010b. If the data is 010b, the process proceeds to step S110, where a guide sound, for example, two buzzer sounds is generated through the speaker 65, and at the same time, the screen 70 displays the text indicating that there is no extended bit stream. If the read data is not 010b, the process proceeds to step S120.

Proceeding from step S100 to step S120, in step S120 it is determined whether there is an extended bit stream, i. In other words, it is determined whether the audio coding mode data read in step S70 is 011b. If the audio coding mode data read in step S11 is 011b, the process proceeds to step S130, and a guide sound, for example, one buzzer sound. It is generated through the speaker 65, and at the same time, is displayed on the screen 70 as an MPEG mode in which the extended bit stream is present, and the flow proceeds to step S140 when the read data is not 010b.

If the process proceeds from step S120 to step S140, step S140 determines whether the read audio mode is the PCM mode, that is, whether the read audio data is 100b. In this case, if the read data is 100b, step S150. ) And display only PCM mode as a character without a guide sound, and if it is not 100b, go to step S160 and if the read data is another data, that is, other option data, for example, 110b, DTS mode, 111b. In this case, it displays SDDS mode.

On the other hand, the flow ends when step S90, step S110, step S130, step S150 or step S160 are completed, respectively.

As described above, the present invention has the effect of enabling the user to set the appropriate audio output mode and the peripheral device for the audio output by reading and notifying the user of the coding mode of the audio data recorded on the disc.

Claims (1)

A digital video disc player audio coding mode guiding method for recognizing and outputting an encoding mode of audio data recorded on a disc to be played in a digital video disc player (A) playing a video title set (VTS) when the audio guidance mode is set; (B) reading and storing video title set information (VTSI) in the VTS; (C) reading a video title set information management table (VTSI_MAT) in the VTSI; (D) reading an audio stream attribute table of VTS (VTS) AST (ATTS) in the VTSI_MAT; (E) reading an audio coding mode recorded in the VTS AST AST ATR in the VTS AST AST ATRT; And (f) displaying the audio coding mode read in the step (e) as a character and generating a guide sound accordingly.