JP3991972B2 - Optical disk playback device - Google Patents

Description

  The present invention relates to an optical disk reproducing apparatus that reads information such as video and audio recorded on an optical disk such as a DVD (Digital Versatile Disc) and reproduces such information, and particularly, a DTS (Digital Theater System) audio reproducing function. Alternatively, the present invention relates to an optical disc playback apparatus that does not have an output function.

  Conventionally, various audio compression data such as linear PCM (Pulse Code Modulation), Dolby Digital, MPEG (Moving Picture Coding Experts Group) audio, and DTS are recorded on an optical disc such as a DVD-ROM (DVD-Read Only Memory). There are so-called multiple audio stream optical discs. In this type of optical disc, the number of optical discs in which DTS audio is recorded in the middle of a stream tends to increase. On the other hand, an optical disk reproducing apparatus that reproduces information such as audio recorded on an optical disk has a decoder for reproducing DTS audio (hereinafter referred to as DTS decoder) in an audio decoder that reproduces audio. There are those that do not output DTS audio because they do not pay license fees such as patents related to DTS decoders.

Also, in this type of apparatus, when the first reproduction process is stopped, voice identification information corresponding to a type of sound other than the DTS sound is stored in the RAM, and when the reproduction process is resumed, the demultiplexer It is known that audio compression data other than DTS audio corresponding to audio identification information stored in RAM is extracted from audio compression data read by an optical pickup and transmitted to an audio decoder. (For example, refer to Patent Document 1). In addition, there is known a voice switching device that operates to output a reproduced audio signal during reproduction and an external audio signal other than during reproduction (see, for example, Patent Document 2).
JP-A-5-307831 JP 2003-006665 A

  In the conventional optical disc playback apparatus having no DTS audio playback function or output function as described above, when an optical disc on which DTS audio data is recorded is loaded from the middle of the stream, the compressed data of the DTS audio is played during the playback. Is sent to the audio decoder. However, since there is no corresponding decoder in the audio decoder, no sound is suddenly output during playback, which causes confusion to the user. Such a problem cannot be solved by any of the inventions disclosed in Patent Documents 1 and 2.

  The present invention has been made in order to solve the above-described problem. In an optical disc playback apparatus that does not have a DTS audio playback function or output function, the audio decoder is switched to a decoder other than the DTS in the course of playback, thereby enabling the DTS. An object of the present invention is to prevent a state in which audio is not output by preventing audio compressed data from being sent to an audio decoder.

In order to achieve the above object, the invention of claim 1 is to identify data reading means for reading compressed video and audio data recorded in a recording area of an optical disc, and a type of compressed data read by the data reading means. A storage means for storing a table of identification information, a demultiplexer for distributing compressed video and audio data read by the data reading means for each data type based on the identification information stored in the storage means, and a demultiplexer Is reproduced by the video reproduction means for reproducing the video based on the compressed data of the video distributed by the audio, the audio reproduction means for reproducing the audio based on the compressed data of the audio distributed by the demultiplexer, and the video reproduction means. Output means for outputting the reproduced video and sound reproduced by the sound reproducing means, data reading means, A storage means, a demultiplexer, a video reproduction means, an audio reproduction means and an output means; a control means for controlling the output means; and an input means operated by a user to input various commands to the control means. The identification information stored in the information table includes voice identification information for identifying the type of voice compression data, and the voice reproduction means compresses various voices read by the data reading means. In an optical disc playback apparatus having various audio decoders other than a DTS (Digital Theater System) decoder for playing back data, the audio playback means is input by the user at the beginning and in the middle of playback of video and audio compressed data. Depending on the operation of the means, any audio decoder including the DTS decoder can be selected, and the control means can select the selected audio decoder. In order to switch the selection of the audio decoder when the type of the audio compression data input from the demultiplexer to the audio reproduction means is DTS audio during reproduction of the compressed video and audio data, a warning display for causing the switching of the audio decoder to the decoder other than DTS is intended to be output to the image reproducing means.

According to a second aspect of the present invention, there is provided a data reading means for reading compressed video and audio data recorded in a recording area of an optical disc, and a data distribution means for distributing compressed video and audio data read by the data reading means for each data type. Multiplexer, video playback means for playing back video based on compressed video data distributed by demultiplexer, audio playback means for playing back audio based on compressed audio data distributed by demultiplexer, and data A control unit for controlling the reading unit, the demultiplexer, the video reproduction unit and the audio reproduction unit; and an input unit operated by a user to input various commands to the control unit. DTS (Digital Theater System) for reproducing compressed data of various audio data read by In the optical disk reproducing apparatus having various audio decoders other than the decoder, the control means is such that the audio decoder selected in accordance with the operation of the input means is a DTS decoder, and the audio from the demultiplexer is reproduced during reproduction of the compressed video and audio data. When the type of compressed audio data input to the playback unit is DTS audio, a warning display for switching the audio decoder to a decoder other than the DTS is output to the video playback unit in order to switch the selection of the audio decoder. It is something to make .

  According to a third aspect of the present invention, in the optical disk reproduction apparatus according to the second aspect, during reproduction of compressed video and audio data, an arbitrary audio decoder can be selected in accordance with the operation of the input means by the user. It is.

  According to the first aspect of the present invention, although the apparatus does not have a DTS decoder, the DTS decoder is selected at the beginning of reproduction and the type of audio data input to the audio reproduction means is DTS audio. Is displayed to switch the audio decoder. In this way, by making the user understand that the loaded optical disc is recorded with DTS audio and the audio decoder needs to be switched, the audio decoder can be switched without causing confusion to the user, It is possible to prevent a state in which no output is made. Also, when an optical disc on which DTS audio is recorded from the middle of a stream is loaded, even if the audio suddenly stops being output during viewing, the above display is output, preventing the user from being confused. This improves the usability of the device. In addition, since the audio decoder can be selected during reproduction, the user can switch the audio decoder to the DTS decoder without interrupting viewing, thereby further improving the usability of the apparatus.

  According to the invention of claim 2, although the apparatus does not have a DTS decoder, the DTS decoder is selected at the beginning of reproduction and the type of audio data input to the audio reproduction means is DTS audio. Is displayed to switch the audio decoder. In this way, by making the user understand that the loaded optical disc is recorded with DTS audio and the audio decoder needs to be switched, the audio decoder can be switched without causing confusion to the user, It is possible to prevent a state in which no output is made. Also, when an optical disc on which DTS audio is recorded from the middle of a stream is loaded, even if the audio suddenly stops being output during viewing, the above display is output, preventing the user from being confused. This improves the usability of the device.

  According to the invention of claim 3, since the audio decoder can be selected during the reproduction, the user can switch the audio decoder to the DTS decoder without interrupting the viewing, thereby further improving the usability of the apparatus. To do.

  A DVD player (optical disc playback apparatus) according to the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows an electrical block configuration of a DVD player. The DVD player 1 is a device that reads compressed data such as video and audio recorded on a DVD (Digital Versatile Disc) 2 and reproduces the video and audio, and outputs the reproduced video and audio. (Digital Theater System) This type does not have a decoder for audio playback.

  The DVD player 1 includes a spindle motor 3 that rotationally drives a DVD 2 mounted on a tray, an optical pickup 4 (data reading means) that outputs information recorded on the DVD 2 in the form of an RF signal, and an output from the optical pickup 4. An RF circuit 5 that performs binarization processing of the RF signal and the like, and a data decoder 6 that performs decoding processing such as data demodulation and error correction on the data processed by the RF circuit 5 are provided. Also, the DVD player 1 includes a demultiplexer 7 that distributes the data decoded by the data decoder 6 into main video compression data, sub-video compression data, and various audio compression data, and a video decoder that decodes the main video compression data. 8 (video reproduction means), a sub-picture decoder 9 (video reproduction means) for decoding sub-video compressed data and reproducing subtitles, and an audio decoder 10 (audio reproduction means) for decoding various audio compression data. .

  An adder 11 in the figure combines the main video sent from the video decoder 8 and the sub-picture such as subtitles sent from the sub-picture decoder 9, and the D / A conversion processing unit 12 includes the adder 11. The video data synthesized by the above and the audio data decoded by the audio decoder 10 are converted into analog signals. The video output terminal 13 (output unit) and the audio output terminal 14 (output unit) output the video signal and the audio signal sent from the D / A conversion processing unit 12, respectively.

  Further, the DVD player 1 has a control unit 20 (control means) for controlling the entire apparatus, and a remote controller 30 for performing instructions such as playback / stop and various settings for the apparatus main body. In addition to the spindle motor 3, the RF circuit 5, the data decoder 6, the demultiplexer 7, the video decoder 8, the sub picture decoder 9, the audio decoder 10, and the adder 11, the control unit 20 stores various setting data and the like. Transmitted from a stored RAM 21 (storage means), an operation unit 22 for giving various instructions to the apparatus, a display unit 23 for displaying various messages, a buffer 24 for temporarily storing data such as resume information, and a remote controller 30 An infrared signal receiving unit 25 for receiving the infrared signal is connected.

  The RAM 21 stores a table of identification information regarding main video compression data, sub-video compression data, and various audio compression data. Among these, the identification information related to the audio compression data is composed of the upper 5 bits of the stream ID and the substream ID as shown in FIG. 2, and this table includes PCM (Pulse Code Modulation), Dolby In addition to digital and MPEG (Moving Picture Coding Experts Group) audio identification information, DTS (Digital Theater System) identification information is also stored. When the reproduction is instructed by the user, the control unit 20 reads the identification information in the table from the RAM 21 and transmits it to the demultiplexer 7, and at the same time, compresses the specific type of audio compression data selected based on a predetermined condition Is transmitted to the demultiplexer 7. Based on the identification information, the demultiplexer 7 distributes the compressed data sent from the data decoder 6 into main video compressed data, sub video compressed data, and audio compressed data, and also from the audio compressed data, the specific data Extract audio compression data with type identification information. Then, the distributed main video compressed data and sub video compressed data are transmitted to the video decoder 8 and the sub picture decoder 9, respectively, and the extracted audio compressed data is transmitted to the audio decoder 10.

  FIG. 3 shows a detailed configuration of the audio decoder 10 in FIG. The audio decoder 10 uses the additional data included in the audio compression data sent from the demultiplexer 7 to control the overall operation of the audio decoder 10, and the audio compression sent from the demultiplexer 7. An input buffer 42 that temporarily stores data, an audio decoder core 43 that reproduces audio based on audio compression data sent from the input buffer 42, and digital audio data that is output to the D / A conversion processor 12 Is constituted by an output buffer 47 for temporarily storing. The audio decoder core 43 includes a linear PCM audio decoder 44, a Dolby digital audio decoder 45, and an MPEG audio decoder 46, except for the DTS audio DTS decoder. .

  The selection of the audio decoder is made according to the operation of the remote controller 30 by the user. For example, when a predetermined key (for example, a menu key) in the remote controller 30 is operated, a menu screen for selecting an audio decoder is output to the monitor device or the like via the video output terminal 13 and provided on the remote controller 30. The audio decoder is switched according to the operation of the arrow key or the like. The menu screen may be output to a monitor device or the like before the reproduction of the main part of the stream is started when the optical disc 2 is loaded in the DVD player 1. Alternatively, a predetermined key in the remote controller 30 may be assigned to each audio decoder so that when any key is operated, the corresponding audio decoder can be switched immediately.

  Next, the stream ID and substream ID in the above-described audio compression data will be described with reference to FIG. FIG. 4 shows the recording state of the audio pack in DVD2. The audio compression data sent from the data decoder 6 to the demultiplexer 7 is configured by combining a plurality of audio packs 50 or configured by one audio pack 50. As shown in the figure, the audio pack 50 includes a pack header 51, a packet header 52, a substream ID 53, audio data 54, and the like. The pack header 51 includes a pack start code, a system time base reference value, and the like, and the packet header 52 includes a packet start code 55, a stream ID 56, and the like as shown in the figure. ing. The audio compression data sent from the data decoder 6 to the demultiplexer 7 includes the stream ID 56 and the substream ID 53, and the demultiplexer 7 uses the upper 5 bits of the stream ID 56 and the substream ID 53. Referring to the audio compression data, a specific type of audio compression data is extracted, and the extracted audio compression data is transmitted to the audio decoder 10.

  Although this DVD player 1 does not have a DTS decoder, when the DTS decoder is selected at the beginning of playback and the type of audio data input to the audio decoder 10 is DTS audio, It has a function of displaying a warning to switch the audio decoder on the screen of the monitor device or the like via the decoder 9 and prompting the user to switch the audio decoder. At this time, the audio is not output from the audio output terminal 14 until the audio decoder is switched to a decoder other than the DTS, but the user can quickly switch the audio decoder without being confused by seeing the above warning on the screen. , Can continue to watch.

  Next, processing performed by the DVD player 1 will be described with reference to the flowchart shown in FIG. 5 and the screen display example shown in FIG. First, when the reproduction process is started (# 1), the selected audio decoder is confirmed (# 2), and if it is a DTS decoder, the process proceeds to # 3 to reproduce the video and audio of the main information. If the audio data to be reproduced by the audio decoder 10 is recognized as DTS audio during the reproduction of the main information (# 4), the sub-picture decoder 9 outputs a warning display for switching the audio decoder (#). 5) Prompt the user to switch the audio decoder. An example of the screen display at this time is shown in FIG. When the user receives this display and switches the audio decoder to the linear PCM decoder 44 (# 6), the main data recorded with the linear PCM audio is reproduced (# 7). If the audio decoder selected in # 2 is a linear PCM decoder, the process proceeds to # 7. If NO in # 4, the process returns to # 3. If NO in # 6, the process returns to # 5. If the DVD player 1 supports Dolby digital audio or MPEG audio, that is, if it has the Dolby digital decoder 44 or the MPEG audio decoder 46 as shown in FIG. 3, the Dolby digital decoder 44 in # 6. Alternatively, switching to the MPEG audio decoder 46 may be performed. In this case, in # 7, Dolby Digital audio data or MPEG audio audio data is reproduced.

  As described above, according to the DVD player 1 according to the present embodiment, the DTS decoder is selected at the beginning of reproduction and input to the audio decoder 10 even though the DVD player 1 does not have the DTS decoder. When the type of audio data is DTS audio, a message to switch the audio decoder is displayed on the screen of the monitor device or the like. In this way, by making the user understand that switching of the audio decoder is necessary because the loaded optical disc 2 is recorded with DTS audio, the audio decoder can be changed to the linear PCM decoder 44 or the like without causing confusion to the user. It is possible to prevent a state in which no sound is output by switching to. Also, when the optical disc 2 in which DTS audio is recorded from the middle of the stream is loaded, the above display is output even if the audio suddenly stops during viewing, preventing the user from being confused. This improves the usability of the device. Further, since the audio decoder can be selected during reproduction, the user can switch the audio decoder to the DTS decoder without interrupting the viewing, and the usability of the DVD player 1 is further improved.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the present embodiment, an example in which the present invention is applied to a DVD player 1 of a type that does not have a DTS audio reproduction decoder has been shown. However, even if a DTS audio reproduction decoder is provided, the DTS decoder The present invention may be applied to a DVD player in which DTS audio is not output for licensing reasons.

The electrical block block diagram of the DVD player which concerns on one Embodiment of this invention. The figure which shows the content of the identification information regarding the audio | voice compression data stored in RAM of the player. The figure which shows the detailed structure of the audio decoder of the player. The figure which shows the recording state of the audio pack in DVD which becomes the reading object of the same player. The flowchart which shows the process of the same player. The figure which showed an example of the warning display to the effect of switching the audio decoder displayed by the player.

Explanation of symbols

1 DVD player (optical disk playback device)
4 Optical pickup (data reading means)
7 Demultiplexer 8 Video decoder (video playback means)
10 Audio decoder (sound reproduction means)
13 Video output terminal (output means)
14 Audio output terminal (output means)
20 Control unit (control means)
21 RAM (storage means)
44 Linear PCM audio decoder (audio decoder)
45 Dolby Digital Audio Decoder (Audio Decoder)
46 MPEG Audio Decoder (Audio Decoder)
53 Substream ID (voice identification information)
56 Stream ID (voice identification information)

Claims (3)

Data reading means for reading compressed video and audio data recorded in the recording area of the optical disc;
Storage means for storing a table of identification information for identifying the type of compressed data read by the data reading means;
A demultiplexer that distributes video and audio compressed data read by the data reading means for each type of data based on the identification information stored in the storage means;
Video playback means for playing back video based on compressed video data distributed by the demultiplexer;
Audio reproduction means for reproducing audio based on the compressed audio data distributed by the demultiplexer;
An output means for outputting the video reproduced by the video reproduction means and the audio reproduced by the audio reproduction means;
Control means for controlling the data reading means, the storage means, the demultiplexer, the video reproduction means, the audio reproduction means and the output means;
Input means operated by a user to input various commands to the control means,
The identification information stored in the identification information table in the storage means includes voice identification information for identifying the type of voice compression data,
The sound reproducing means includes
In an optical disk reproducing apparatus having various audio decoders except for a DTS (Digital Theater System) decoder for reproducing compressed data of various audio read by the data reading means,
The sound reproducing means includes
In the beginning of reproduction and during reproduction of the compressed video and audio data, any audio decoder including the DTS decoder can be selected in accordance with the operation of the input means by the user.
In the control means, the selected audio decoder is a DTS decoder, and the type of compressed audio data input from the demultiplexer to the audio reproduction means during reproduction of the compressed video and audio data is DTS audio. At one point, in order to to switch the selection of the audio decoder, the optical disk reproducing apparatus, characterized in that to output a warning display for causing the switching of the audio decoder to the decoder other than DTS to the image reproducing means. Data reading means for reading compressed video and audio data recorded in the recording area of the optical disc;
A demultiplexer that distributes compressed video and audio data read by the data reading means for each type of data;
Video playback means for playing back video based on compressed video data distributed by the demultiplexer;
Audio reproduction means for reproducing audio based on the compressed audio data distributed by the demultiplexer;
Control means for controlling the data reading means, the demultiplexer, the video reproduction means and the audio reproduction means;
Input means operated by a user to input various commands to the control means,
The sound reproducing means includes
In an optical disk reproducing apparatus having various audio decoders except for a DTS (Digital Theater System) decoder for reproducing compressed data of various audio read by the data reading means,
In the control means, the audio decoder selected in accordance with the operation of the input means is a DTS decoder, and the audio input from the demultiplexer to the audio reproduction means during reproduction of the compressed video and audio data is reproduced. when the type of the compressed data is DTS audio, for to switch the selection of the audio decoder, and characterized in that to output a warning display for causing switches the audio decoder to the decoder other than DTS to the video reproduction means Optical disk playback device.   3. The optical disc reproducing apparatus according to claim 2, wherein any one of the audio decoders can be selected in accordance with an operation of the input unit by a user during reproduction of the video and audio compressed data.

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