JP2002335490A - Dvd player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DVD player that can switch display and non display of a caption depending on user's operations even in the case of a DVD disk on which a video image with a caption is recorded. SOLUTION: A lines detection section 37 compares two audio signals to detect the presence of lines. When the lines detection section 37 detects lines, a caption detection section 38 uses e.g. an image recognition technology to check a lower side and a right side of an image on which captions are possibly displayed to detect the presence of the caption and the position of the caption. An image control section 44 applies signal processing to the part of caption in a video signal outputted from a video decoder 40 to delete the caption from the video image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD (Digital)
More particularly, the present invention relates to a DVD player capable of erasing subtitles from a video even if the disc has a captioned video recorded thereon.

[0002]

2. Description of the Related Art In recent years, DVD playback devices have rapidly become widespread, and it has become possible to enjoy movies and the like at home with high image quality and high sound quality. According to the DVD specification, audio languages can be recorded in up to 8 languages, subtitle languages (sub-pictures) can be recorded in up to 32 languages, and angles can be recorded in up to 9 angles. When a plurality of audio languages, subtitle languages, and angles are recorded on a DVD disc (a disc manufactured in accordance with the DVD standard: the same applies hereinafter), the user switches to a desired audio language, subtitle language, and angle to switch to a video. You can enjoy.

[0003]

SUMMARY OF THE INVENTION In a DVD reproducing apparatus,
For example, it is possible to enjoy a movie by setting the audio to English and the subtitle to Japanese, or to erase the subtitle while setting the audio to English. However, these functions cannot be used unless the content recorded on the DVD disk corresponds. On the other hand, commercially available D
With VD discs, video and subtitles are not recorded separately,
Some have recorded video with subtitles. For example, an old film of a foreign movie is directly converted to a DVD video, or a content for a video cassette is directly converted to a DVD.
Such as video.

[0004] When a video recorded on such a DVD disk is reproduced by a DVD reproducing apparatus, the subtitles overlap with the video, and it appears as if the subtitles are selected. However, in such a DVD disc, the subtitle cannot be erased even when the user performs an operation to erase the subtitle during reproduction. For this reason, the user may determine that the subtitle has been selected but cannot be erased. Then, it cannot be determined whether the reason why the subtitles cannot be erased is in the DVD disc or the DVD playback device.

[0005] Therefore, in the conventional DVD reproducing apparatus, when the user cannot delete the subtitle even if the user performs an operation to delete the subtitle, the DVD reproducing apparatus does not have the cause even though the content is recorded on the DVD disk. (Reproducing apparatus body or remote control) may be erroneously determined to be faulty. Also, as described above, a major feature of the DVD playback device is that the user can arbitrarily display and erase subtitles. Therefore, even if the cause is in the content recorded on the DVD disc, the subtitles can be erased. The inability to do so causes great frustration for the user.

It is an object of the present invention to provide a DVD reproducing apparatus which can switch between displaying and non-displaying subtitles in accordance with a user operation, even for a DVD disk on which subtitled video is recorded.

[0007]

Means for Solving the Problems A DV according to the first invention of the present application is provided.
A D playback device configured to separate a first audio bit stream, a second audio bit stream, and a main picture bit stream from data read from the DVD disc; and a decoder that decodes the first audio bit stream. A first audio decoder for outputting a first audio signal, a second audio decoder for decoding the second audio bit stream and outputting a second audio signal, and the first and second audio signals To detect the presence or absence of dialogue, a dialogue detection unit that outputs a dialogue presence / absence signal according to the result, a video decoder that decodes the main picture bit stream and outputs a video signal, A portion corresponding to a specific portion of a video in the video signal To detect the presence or absence of a subtitle, a subtitle detection unit that outputs a subtitle presence / absence signal and a subtitle position signal according to the result, and, in accordance with the subtitle presence / absence signal, indicated by the subtitle position signal in the video signal A subtitle control unit that performs signal processing on the portion and deletes subtitles from the video.

[0008] A DVD reproducing apparatus according to a second aspect of the present invention includes a stream separating unit for separating an audio bit stream and a main picture bit stream from data read from a DVD disk, and an audio bit stream for decoding the audio bit stream to obtain an audio bit stream. An audio decoder that outputs a signal, a speech detection unit that detects the presence / absence of speech from the audio signal, and outputs a speech presence / absence signal according to the result, and a video that decodes the main picture bit stream and outputs a video signal. A subtitle detector for detecting a subtitle presence / absence by examining a portion of the video signal corresponding to a specific portion of the video in response to the speech presence / absence signal, and outputting a subtitle presence / absence signal and a subtitle position signal according to the result; And the video signal according to the subtitle presence / absence signal. Serial and signal processing portions indicated by the subtitle position signal; and a subtitle controller to erase the subtitle from the image.

In the present invention, an audio signal is examined by a serif detecting unit to detect the presence or absence of a serif. When a line is detected by the line detection unit, the subtitle detection unit
For example, using an image recognition technique, a portion corresponding to a specific range in which a caption is likely to be displayed when the video signal is converted to a video is examined, and the presence or absence of the caption and the position of the caption are detected.

When a caption is detected by the caption detection section, the caption control section performs signal processing on a specific portion of the video signal, and deletes the caption from the video. As a result, even on a DVD disk on which a video with captions is recorded, the captions can be erased from the video. As signal processing for erasing subtitles from a video, for example, there is a processing of mixing a character color portion with a surrounding color to blur it. Further, when the surroundings of the character color are a single color, there is a process of filling the sentence portion with the surrounding color.

[0011] It is determined whether or not a specific portion of a video has subtitles by using an image recognition technique without checking whether or not a line is included in the audio signal. At times, it is conceivable to perform signal processing to delete subtitles. However, in this case, there is a high possibility that the subtitles are erroneously detected and signal processing is applied to a portion having no subtitles, thereby deteriorating the image quality.

On the other hand, in the present invention, the presence / absence of a line included in an audio signal is detected by using a line detection unit, and only when a line is detected, the subtitle detection unit determines whether or not there is a subtitle in a specific portion of the video. Is determined, and when it is determined that there is a subtitle, signal processing is performed to delete the subtitle. As a result, deterioration of video quality due to erroneous detection of subtitles is prevented. As a method for detecting dialogue, the first invention of the present application compares the first and second audio signals recorded on a DVD disk. For example, when an audio signal for English and an audio signal for Japanese are recorded on a DVD disc,
The difference between the first and second audio signals is small in the music and sound effect portions, and the difference between the first and second audio signals is in the speech portion.
The difference between the audio signals is larger. Therefore, when the difference between the first and second audio signals exceeds a certain range,
It can be determined that there is a line. This makes it possible to reliably detect the presence or absence of dialogue.

In the second invention of the present application, it is detected whether or not the audio signal contains dialogue by using a speech recognition technique. In this case, the detection accuracy is improved by extracting only the signal in the audio band from the audio signal and performing voice recognition.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. (First Embodiment) FIG. 1 is a block diagram showing a configuration of a DVD reproducing apparatus according to a first embodiment of the present invention.

Reference numeral 10 denotes a DVD disk loaded in the apparatus. Reference numeral 12 denotes a spindle motor for rotating the disk 10, and reference numeral 14 denotes an optical pickup that irradiates the disk 10 with laser light, reads out data recorded on the disk 10 by reflected light thereof, and outputs the data as an RF signal. Reference numeral 16 denotes a feed motor for moving a thread (not shown) on which the optical pickup 14 is mounted in the radial direction of the disk 10. Reference numeral 18 denotes drive control of the feed motor 16, tracking control and focus control of the optical pickup 14, and spindle motor 12. This is a servo control unit that controls the rotation of.

An RF amplifier 22 amplifies the RF signal output from the optical pickup 14 and transmits the amplified signal to the next stage.
Further, the RF amplifier 22 separates control signals such as focus search and tracking from the RF signal, and sends these control signals to the servo control unit 18. Reference numeral 24 denotes a digital signal processing unit which performs digital signal processing on the RF signal output from the RF amplifier 22, and separates a part of the control signal.
The separated control signal is sent to the servo control unit 18 and a system controller 50 described later. Reference numeral 25 denotes a memory (RAM) in which data is temporarily stored in accordance with the signal processing of the digital signal processing unit 24.

Reference numeral 30 denotes a stream separation unit that separates a signal output from the digital signal processing unit 24 into an audio bit stream, a main picture bit stream, and a sub-picture bit stream. An audio decoder 32 decodes the audio bit stream separated by the stream separation unit 30 and outputs a digital audio signal. This audio decoder 3
2 indicates the type of audio signal (linear PCM, AC-3
And MPEG audio, etc.). Reference numeral 33 denotes a memory (RAM) in which data is temporarily stored in accordance with the decoding process of the audio decoder 32.

Reference numeral 36 denotes a D / A (digital / analog) for converting a digital audio signal output from the audio decoder 32 into an analog audio signal (audio signal).
It is a converter. The audio signal output from the D / A converter 36 is sent to a speaker (not shown) via an amplifier (not shown). 34 is also the stream separation unit 30
Is an audio decoder that decodes the audio bit stream separated by and outputs a digital audio signal. However, the audio decoder 34 decodes an audio bit stream different from that of the audio decoder 32. The audio decoder 34
The audio signal output from is used only for detecting dialogue. 35 is a memory (RA) in which data is temporarily stored in accordance with the decoding process of the audio decoder 34.
M).

Reference numeral 40 denotes a video decoder for decoding the main picture bit stream separated by the stream separation unit 30, and reference numeral 41 denotes a memory (RA) in which data is temporarily stored in accordance with the decoding processing of the video decoder 40.
M). Reference numeral 42 denotes a sub-picture decoder for decoding the sub-picture bit stream separated by the stream separation unit 30, and reference numeral 43 denotes a RAM for temporarily storing data as the sub-picture decoder 42 performs decoding. is there.

The main picture bit stream is MPE
The signal is a signal compressed according to the G2 format, and the sub-picture bit stream is run-length (Run-leng).
ht) The signal is compressed according to the compression method. Reference numeral 37 denotes a dialogue detection unit that detects the start timing and the end timing of the dialogue. The serif detecting unit 37 outputs the output of the audio decoder 32 and the audio decoder 34.
The presence or absence of a line is detected by taking the difference from the output. Details of the configuration and operation of the serif detection unit 37 will be described later.

The subtitle detecting section 38 detects whether or not the video signal (main picture) output from the video decoder 40 includes subtitles. Usually, subtitles are displayed in a specific area on the lower or right side of the screen. In addition, a bright color such as white is used as the character color of the caption, and black or a color close to black is used as the background color of the character. Therefore, the color distribution in these specific ranges is monitored, and the proportion of the character color (generally white) increases in synchronization with the start of the dialogue, so that the subtitle is displayed and the subtitle is displayed. The display position (display range) can be detected with high probability. Caption detection unit 38
Will be described later.

Reference numeral 44 denotes a caption control unit for filtering the signal of the caption portion of the main picture (video signal) output from the video decoder 40 and deleting the caption from the video. The configuration and operation of the caption control unit 44 will also be described later. 46 is a video processor. The video processor 46 digitally synthesizes a main picture output from the video decoder 40 and a sub-picture output from the sub-picture decoder 42 according to a signal from a system controller 50 described later. Reference numeral 48 denotes a video encoder that converts a digital video signal output from the video processor 46 into an analog video signal. The video signal output from the video encoder 48 is a CRT (Cath
ode-Ray Tube) or a display device (not shown) such as a liquid crystal panel, and the image is displayed on the display device.

Reference numeral 50 denotes a system controller; and 52, an operation unit provided with various operation buttons and the like. The system controller 50 controls the servo controller 18, the digital signal processor 24, the stream separator 30, the video processor 46 based on the signal from the operation unit 52, the signal from the digital signal processor 24, and the signal from the stream separator 30.
And the subtitle control unit 44 and the like.

FIG. 2 is a block diagram showing the structure of the dialogue detecting section 37. The dialogue detecting unit 37 includes two audio frequency band extracting units 61 and 63, two spectroanalyzers 62 and 64, and a determining unit 65. The spectroanalyzer 62 is composed of m (m is plural: four in the figure) bandpass filters 62a having different pass frequency bands and m (four in the figure) data processing sections 62b. Have been. Similarly, the spectroanalyzer 64 also has m different passbands from each other.
(Four in the figure) band-pass filters 64a and m (four in the figure) data processing units 64b.

The audio frequency band extracting section 61 receives the audio signal 1 output from the audio decoder 32,
The audio band of the audio signal 1 (for example, 300
Hz to 3.4 kHz) is transmitted to the spectro analyzer 62. The spectroanalyzer 62 divides the signal output from the audio frequency band extracting unit 61 into frequency bands by m band-pass filters 62a, and divides these signals into a predetermined number of bits by m data processing units 62b. Convert to data.

Similarly, the audio frequency band extractor 63 receives the audio signal 2 output from the audio decoder 34 and spectroscopically analyzes only the audio band (for example, 300 Hz to 3.4 kHz) signal of the audio signal 2. The signal is transmitted to the analyzer 64. Spectroanalyzer 64
Divides a signal output from the audio frequency band extraction unit 63 into frequency bands by m bandpass filters 64a, and converts these signals into data of a predetermined number of bits by m data conversion processing units 64b. I do.

The determination unit 65 includes the spectroanalyzer 6
The data of the same frequency band respectively inputted from 2, 2 and 64 are compared with each other. If there is a difference between the data of the audio signal 1 and the data of the audio signal 2 which is equal to or larger than a preset value, it is determined that there is a dialogue. If there is no difference greater than a preset value between the data of the audio signal 1 and the data of the audio signal 2, it is determined that there is no dialogue.

For example, an audio signal for English is output from the audio decoder 32 and an audio decoder 34
Output a Japanese audio signal. In this case, the English audio signal includes English words, music, sound effects, and the like. The audio signal for Japanese includes Japanese words, music, sound effects, and the like. Since music, sound effects, and the like are common, it is possible to detect the presence or absence of dialogue by taking the difference between these audio signals.

When the determination unit 65 determines that the difference between the audio signals 1 and 2 is small and there is no speech, the speech presence / absence signal is made inactive. When the determination unit 65 determines that the difference between the audio signals 1 and 2 is large and that there is a dialogue, the determination unit 65 activates the dialogue presence / absence signal. FIG. 3 is a block diagram showing a configuration of the caption detection unit 38. The caption detection unit 38 includes an image lower data extraction unit 71, a character string detection unit 7,
2, ring buffer 73, video right data extraction unit 74,
It comprises a character string detection unit 75, a ring buffer 76, and a subtitle presence / absence determination unit 77.

The lower image data extracting section 71 outputs a signal of a specific portion of the video signal output from the video decoder 40 for each frame (a signal corresponding to a lower portion of the image where subtitles may be displayed). Extract only The character string detection unit 72 expands, for example, the signal extracted by the data extraction unit 71 into a memory, and checks whether or not the image includes a character string. For character string recognition, for example, a method of directly detecting a character from an image using a known character recognition technology, or a color opposite to a character color by an image recognition technology (when the character color is white,
Black or a color having a luminance close to black). Further, as described in JP-A-9-91453, images of several frames may be examined in chronological order, and a character string may be detected when the position of the character color does not change over several frames.

The ring buffer 73 includes a character string detector 72
Are output for a plurality of frames, and when the speech presence / absence signal is activated, the new storage order (where 1 ≦ n ≦ m) is output to the subtitle presence / absence determination unit 77. . Similarly, the video right data extraction unit 74
Extracts only a signal of a specific portion (a signal corresponding to a right portion of an image in which subtitles may be displayed) from a video signal output from the video decoder 40 for each frame. The character string detection unit 75 expands, for example, a signal extracted by the data extraction unit 71 into a memory, and checks whether or not a character string is included in the image using a character recognition technique or an image recognition technique.

The ring buffer 76 includes a character string detection unit 75
Is output for a plurality of frames. When the dialogue signal becomes active, the storage unit outputs n pieces of information with the new storage order to the character presence determination unit 77. The subtitle presence / absence determination unit 77 checks the outputs of the ring buffer 73 and the ring buffer 76, and activates the subtitle presence / absence signal when either output changes from the absence of a character string to the presence of a character string. At this time, the subtitle position signal is changed according to whether the change in the character string is detected by the output of the ring buffer 73 or the output of the ring buffer 76. Thereafter, when the output of the ring buffer 73 or the ring buffer 76 changes from the presence of a character string to the absence of a character string, the subtitle presence / absence determination unit 77 deactivates the subtitle presence / absence signal.

That is, when the serif detecting unit 37 detects a serif, the caption detecting unit 38 checks whether or not the image displayed by the video signal output from the video decoder 40 includes the caption, and determines whether or not the caption is included. If the subtitle is present, the subtitle presence / absence signal is activated, and the subtitle position signal is changed depending on whether the subtitle is displayed on the lower side of the screen or on the right side. Here, the subtitle position signal is deactivated when the subtitle is displayed on the lower side of the screen, and the subtitle position signal is activated when the subtitle is displayed on the right side of the screen.

FIG. 4 is a block diagram showing the structure of the subtitle control unit 44. The subtitle control unit 44 includes the input-side selector 8
1, two image filters 82 and 83, and an output-side selector 84. Input side selector 81
Outputs a video signal from the video decoder 40, outputs a video signal to the image filter 82 when both the subtitle presence / absence signal and the subtitle position signal are active, and outputs the video signal when the subtitle presence / absence signal is active and the subtitle position signal is inactive. The video signal is output to the image filter 83, and when the subtitle presence / absence signal is inactive, the video signal is directly output to the output side selector 8.
4 is output.

The image filter 82 applies a filter to the right portion of the video displayed from the video signal input from the selector 81 to delete subtitles. For example, subtitles are erased by mixing the subtitle color part with the surrounding color to blur the character part, or if the character part is a single color, filling the character part with that color to erase the subtitle . Similarly, the image filter 83 applies a filter to the lower part of the image displayed by the image signal input from the selector 81 to delete subtitles.

The output-side selector 84 inputs a video signal from any one of the image filter 82, the image filter 83 and the input-side selector 81 in accordance with the subtitle presence / absence signal and the subtitle position signal, and the video processor 46 at the next stage. To communicate. That is, the output selector 84 transmits the output of the image filter 82 to the video processor 46 when both the subtitle presence / absence signal and the subtitle position signal are active, and outputs the image when the subtitle presence / absence signal is active and the subtitle position signal is inactive. Output of filter 83 to video processor 4
6 when the subtitle presence / absence signal is inactive, the video signal is directly input from the input side selector 81 and output to the video processor 46.

The above-mentioned dialogue detection section 37, caption detection section 38, and caption control section 44 operate only when the user operates the operation section 52 to delete the caption. The control unit 44 transmits the output of the video decoder 40 directly to the video processor 46. Hereinafter, the operation at the time of subtitle erasure of the DVD reproducing apparatus of the present embodiment configured as described above will be described.

When a DVD disc in which subtitles are recorded as part of a video is reproduced by the DVD reproducing apparatus of the present embodiment, when the speech starts, the speech presence / absence signal output from the speech detection unit 37 becomes active. Caption detector 3
In step 8, the presence or absence of subtitles and the position of subtitles (lower or right side of the screen) are detected. Then, when a caption is detected, the caption control unit 44 partially filters the video signal and deletes the caption (character string). For example, in a wide-screen (scope size) movie, as shown in FIG. 5, black masks are displayed at the top and bottom of the screen, and subtitles are often displayed at the lower mask portions. In this case, the subtitle can be completely erased by filling the subtitle portion with black. Even when there is a subtitle in a portion other than the mask, the subtitle can be made almost inconspicuous by, for example, adding a process of blurring the character string portion with its surrounding color.

As described above, the DVD reproducing apparatus according to the present embodiment can erase subtitles even when reproducing a DVD disk in which subtitles are recorded as part of video. In addition, the DVD reproducing apparatus according to the present embodiment detects the presence or absence of subtitles only when there is a dialogue, so that it is extremely unlikely that signal processing is performed on a part without subtitles due to a malfunction of the subtitle detection unit 38, and the Deterioration can be prevented.

(Second Embodiment) FIG. 6 shows a second embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a DVD playback device according to the embodiment. The second embodiment differs from the first embodiment in that the presence / absence of dialogue is detected by one audio signal, and the other configurations are basically the same as the first embodiment. Therefore, in FIG. 6, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the serif detecting unit 54
The presence or absence of a line is detected from one audio signal. For this reason, as shown in FIG. 7, the speech detection unit 54 includes an audio frequency band extraction unit 91, an audio recognition unit 92, and a determination unit 93.
It is composed of The audio frequency band extraction unit 91 extracts only a signal of a frequency in a human audio band from the audio signal output from the audio decoder 32 and outputs the extracted signal to the audio recognition unit 92.

The voice recognition unit 92 is a voice frequency band extraction unit 91
Is converted into a character string using speech recognition technology. The determination unit 93 stores a database of significant character strings. Then, the determination unit 93 determines whether the character string output from the speech recognition unit 92 is a significant character string with reference to the database. When a significant character string is detected, the determination unit 93 activates a speech presence / absence signal.

As in the first embodiment, the caption detecting section 38 detects whether or not there is a caption on the lower side and the right side of the image when the speech presence / absence signal is active, and according to the detection result. The subtitle presence / absence signal and the subtitle position signal are output. The DVD reproducing apparatus according to the present embodiment can also erase subtitles even when reproducing a DVD disk in which subtitles are recorded as part of a video.

In this embodiment, the serif detecting unit 5
In step 4, the presence or absence of dialogue is detected by voice recognition.
It is conceivable that a video signal including subtitles is output from the. Therefore, for example, it is preferable to provide a signal delay circuit between the subtitle control unit 44 and the video encoder 40 to adjust the timing at which the subtitles are erased.

In this embodiment, since the presence / absence of speech is detected by one audio signal, there is a possibility that speech is erroneously detected. However, even if the serif detecting unit 54 erroneously detects a serif, the caption detecting unit 38 detects the presence or absence of a caption.
Is unlikely to filter the video with. Also, temporarily,
Even if the video is filtered by the subtitle control unit 44 when there is no line, only a part of the video is slightly blurred,
There is no significant loss in video quality.

[0046]

As described above, according to the DVD reproducing apparatus of the present invention, the audio signal is examined by the serif detecting section to detect the presence or absence of the serif. When the serif is detected by the serif detecting unit, the caption detecting unit checks a portion of the video signal corresponding to a specific range in which the caption may be displayed when the image is converted to an image, and determines whether or not the caption is present. And the position of. When the caption detection unit detects a caption, the caption control unit performs signal processing on a specific portion of the video signal, and deletes the caption from the video. As a result, even on a DVD disk on which a video with captions is recorded, the captions can be erased from the video. In addition, since there is a line, and the signal processing is added to the video signal by the caption control unit only when the caption is detected by the caption detection unit, the possibility of performing the signal processing on the portion without the caption due to the malfunction of the caption detection unit is low, Deterioration of video quality is avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a DVD playback device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a dialogue detection unit.

FIG. 3 is a block diagram illustrating a configuration of a caption detection unit.

FIG. 4 is a block diagram illustrating a configuration of a caption control unit.

FIG. 5 is a diagram showing a display example of captions in a wide-screen (scope size) movie.

FIG. 6 is a block diagram showing a configuration of a DVD playback device according to a second embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a speech detection unit according to a second embodiment;

[Explanation of symbols]

 10 DVD disk, 12 spindle motor, 14 optical pickup, 16 feed motor, 18 servo control unit, 22 RF amplifier, 24 digital signal processing unit, 25, 33, 35, 41, 43 RAM Reference numeral 30: stream separation unit, 32, 34: audio decoder, 36: D / A converter, 37, 54: serif detection unit, 38: subtitle detection unit, 40: video decoder, 42: sub-picture decoder, 44: subtitle control 46, a video processor, 48, a video encoder, 50, a system controller, 52, an operation unit, 61, 63, 91, an audio frequency band extraction unit, 62, 64, a spectroanalyzer, 65, 93, a determination unit, 71, Image lower data extraction unit, 72, 75: character string detection unit, 73, 76: ring buffer, 74: image Right data extraction unit, 77 ... caption determining unit, 81 and 84 ... selector, 82 and 83 ... image filter, 92 ... speech recognition unit.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 20/10 321 G10L 3/00 551G 5D077 27/34 9/18 M H04N 5/278 H04N 5/93 Z 5/93 F term (reference) 5C023 AA18 AA40 BA02 CA05 5C053 FA24 GB11 GB12 HA40 JA01 JA15 KA01 KA24 KA25 LA06 5D015 AA01 HH03 5D044 AB06 AB09 BC04 CC04 DE18 DE58 DE96 5D045 DA00 5D077 AA23 BA11 CA12 EA06 EA07

Claims (5)

[Claims] A stream separation unit configured to separate a first audio bit stream, a second audio bit stream, and a main picture bit stream from data read from a DVD disc; and a decoder that decodes the first audio bit stream. A first audio decoder for outputting a first audio signal, a second audio decoder for decoding the second audio bit stream and outputting a second audio signal, and the first and second audio signals To detect the presence or absence of dialogue, a dialogue detection unit that outputs a dialogue presence / absence signal according to the result, a video decoder that decodes the main picture bitstream and outputs a video signal, Corresponding to a specific part of the video in the video signal Examine the minute to detect the presence or absence of subtitles,
A subtitle detection unit that outputs a subtitle presence / absence signal and a subtitle position signal according to the result; and, in accordance with the subtitle presence / absence signal, performs signal processing on a portion of the video signal indicated by the subtitle position signal to convert subtitles from video. A DVD playback device comprising a subtitle control unit for erasing. 2. A stream separation unit that separates an audio bit stream and a main picture bit stream from data read from a DVD disk; an audio decoder that decodes the audio bit stream and outputs an audio signal; A speech detection unit that detects the presence / absence of dialogue and outputs a speech presence / absence signal according to the result, a video decoder that decodes the main picture bitstream and outputs a video signal, Examine the portion of the video signal corresponding to the specific portion of the video to detect the presence or absence of subtitles,
A subtitle detection unit that outputs a subtitle presence / absence signal and a subtitle position signal according to the result; and, in accordance with the subtitle presence / absence signal, performs signal processing on a portion of the video signal indicated by the subtitle position signal to convert subtitles from video. A DVD playback device comprising a subtitle control unit for erasing. 3. The method according to claim 2, wherein the subtitle detection unit examines a portion of the video signal corresponding to a predetermined lower range of the video and a predetermined range of the right side of the video signal when detecting the presence or absence of the subtitle. The DVD playback device according to claim 1. 4. The subtitle control unit, according to claim 1, further comprising:
3. The DV according to claim 1, wherein subtitles are erased from the video by filling with a color opposite to the character color.
D playback device. 5. The DVD reproducing apparatus according to claim 2, wherein the line detecting unit detects a line from the audio signal using a voice recognition technique.