JP2007129663A - Reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing apparatus which can display automatically a conversation or words of characters, etc. which is hard to hear for a user as a closed caption when data for viewing and listening is reproduced for video data, voice data and closed caption data. <P>SOLUTION: A volume decision unit 25 computes the average value of a sound volume for every predetermined determination period, and it is determined whether the average volume is smaller than the threshold stored in a threshold memory 26. When the average volume is smaller than the threshold, the closed caption of the closed caption data is synthesized in a synthetic portion 19 on the video image of the video data, and it is displayed on the display 27. The threshold for the determination can be changed by the user's operating a threshold setting button 32. Moreover, when the user operates a volume setting button 33 and changes the volume, the threshold is changed in response to the volume after setting. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a playback device that plays back viewing data including video data, audio data, and caption data, and more particularly, playback that displays corresponding caption data when there is a possibility that the user cannot hear the sound data. Relates to the device.

  Conventionally, for example, a DVD of a foreign language movie contains subtitle data together with video and audio data of the movie, and the user can select whether or not to display subtitles when watching a movie. I can do it. When caption data in a plurality of languages is stored, the user can select a language to be displayed as captions. Thereby, even a user who cannot understand a foreign language can view a movie in a foreign language. In television broadcasting, programs that can display subtitles in their native language on programs in their native language using text broadcasting are being broadcast. This is a service mainly for users who are deaf, and it is possible to know the conversation of the characters by subtitles and enjoy the program.

  In Patent Document 1, a content creation device that creates speech balloon data necessary to display subtitles in a speech balloon, a content transmission device that multiplexes and transmits the created speech balloon data together with video and audio data, and There has been proposed a video content providing system including a generation device for receiving and reproducing data. This system has an advantage that the user can easily understand the correspondence between the person in the video and the caption.

On the other hand, when the user views a DVD of a native language movie or when watching a television program in the native language, the volume of the audio data may be small, and the conversation or dialogue of the characters may not be heard. In particular, depending on the viewing environment of the user, the ambient noise may be loud, and in this case, there is a possibility that the conversation or dialogue cannot be heard further. If the conversation or dialogue cannot be heard, the user needs to replay the DVD by replaying the DVD for about a few seconds, and cannot watch the program again when watching the TV program without recording it. There is a risk that the contents of the program will not be understood.
JP 2005-124169 A

  The above problem that there is a possibility that the conversation or dialogue of the characters may not be heard can be solved by watching the audio output volume of a DVD player or television device with a sufficiently high level in advance. In some cases, the output volume cannot be increased sufficiently depending on the viewing environment of the user. In addition, when subtitle data is included in a DVD, or when a TV program supports subtitle display by teletext, the above problem can be solved by displaying subtitles together with video in advance. Can do. However, when the sound can be heard sufficiently, the display of subtitles makes it difficult to see a part of the video, which makes the display of subtitles troublesome for the user.

  The present invention has been made in view of such circumstances, and an object of the present invention is to synthesize and output subtitles of subtitle data on video data when the volume of the volume data is low. Accordingly, it is an object of the present invention to provide a playback device that can display a conversation or dialogue that is likely to be difficult for the user to hear as subtitles.

  Another object of the present invention is to determine whether or not the volume of the audio data is low from the average value of the volume during a predetermined determination period, so that an instantaneous silence state included in the audio data can be obtained. It is an object of the present invention to provide a playback device that does not erroneously determine and displays unnecessary subtitles.

  Another object of the present invention is to calculate the average display time of subtitle data in the subtitle data, and to determine the volume using the period for each average time as a determination period. It is an object of the present invention to provide a playback apparatus that can make a determination in a determination period suitable for the length of conversation or dialogue.

  Another object of the present invention is to make it difficult to hear the conversation or dialogue of the characters by making the volume determination with the period from the display start time and the end time of the caption data as the determination period. It is an object of the present invention to provide a playback apparatus that can more accurately determine whether or not.

  Another object of the present invention is that the user inputs a threshold value for determining whether or not the volume is low, and accepts the threshold value, so that the user's viewing environment and the user's listening ability can be personalized. It is an object of the present invention to provide a playback device that allows a user to change a determination criterion according to a difference.

  Another object of the present invention is that when the user changes the volume with a volume switch or the like, the configuration is such that the threshold value for determination is changed so that the user can talk or talk about the characters. It is an object of the present invention to provide a playback apparatus that can more reliably determine whether or not it can be heard.

  Another object of the present invention is to reduce the threshold for determination when the user increases the volume, and increase the threshold when the user decreases the volume. It is an object of the present invention to provide a playback apparatus that can reliably display subtitles when it is small.

  Another object of the present invention is to extract the voice of the human voice frequency band from the voice data and determine whether the extracted voice is low or not. It is an object of the present invention to provide a playback apparatus capable of determining only the sound volume.

  Another object of the present invention is to determine whether or not the volume of the sound outside the apparatus is high, and to synthesize the caption of the caption data with the video data according to the determination result and output it. Accordingly, it is an object of the present invention to provide a display device that can determine whether or not a character's conversation or dialogue can be heard according to the viewing environment of the user and display subtitle data.

  Another object of the present invention is a configuration in which a user inputs an external volume threshold for determining an external volume, accepts this, and changes the external volume threshold for determination to make a determination. Accordingly, it is an object of the present invention to provide a playback device that allows the user to change the criteria for determination according to individual differences in the viewing environment of the user and the listening ability of the user.

  In addition, another object of the present invention is that, when the user changes the volume with a volume switch or the like, the configuration is such that the threshold value for determining the external sound is changed, so that the conversation of the characters Another object of the present invention is to provide a playback apparatus that can more reliably determine whether or not a user can hear a dialogue.

  Another object of the present invention is to increase the external volume threshold for determination when the user increases the volume and to decrease the external volume threshold when the user decreases the volume. It is an object of the present invention to provide a playback apparatus that can display subtitles reliably when the volume of sound to be played is low.

  The playback device according to the present invention is a playback device that plays back viewing data including video data, audio data, and caption data, and a determination unit that determines whether or not the volume of the audio data is smaller than a predetermined threshold value; A synthesizing unit that synthesizes subtitles of the corresponding subtitle data with the video data corresponding to the audio data determined to have a low volume by the determining unit, and a video output process that performs processing related to the output of the video with the combined subtitle And audio output processing means for performing processing relating to output of audio corresponding to the video output by the video output processing means.

  In the present invention, when the sound volume of the audio data is low, the caption of the caption data is synthesized with the video data and output. Since the conversation or dialogue of a character with a low volume is likely to be missed by the user, the caption corresponding to the conversation or dialogue that is likely to be missed is displayed. The user can understand the conversation or dialogue of the characters from the subtitles.

  Further, in the playback apparatus according to the present invention, the determination unit calculates an average value of sound volume during a predetermined determination period, and performs determination by comparing the calculated average value with the threshold value. It is characterized by.

  In the present invention, the average value of the sound volume is calculated for each predetermined determination period, and it is determined whether or not the sound volume is low from this average value. There may be a moment in which the conversation or dialogue of the characters is interrupted and no sound is output in the movie or program to be played back, so the judgment can be made to a certain extent so that it is not judged that the volume is low. This is done using the average value of the period with

  In addition, the playback device according to the present invention includes an acquisition unit that acquires a display time of a caption of the caption data, and a calculation unit that calculates an average time of the acquired display time, and the determination unit includes: The determination is performed using the calculated average time period as the determination period.

  In the present invention, the display time of the caption data of the caption data is acquired, the average time of the display time is calculated, and the period for each average time is set as the determination period for performing the sound volume determination. Thereby, the determination period can be changed according to the length of the conversation or dialogue included in the movie or program to be reproduced, and the determination suitable for the movie or program to be reproduced can be performed.

  In addition, the playback device according to the present invention includes an acquisition unit that acquires a display start time and a display end time of the caption of the caption data, and the determination unit is configured to display from the display start time acquired by the acquisition unit to the display end time. The determination is performed by setting the period as the determination period.

  In the present invention, the subtitle display start time and display end time of the subtitle data are acquired, and the period from the display start time to the display end time is determined as the determination period. Thereby, it is possible to determine the sound volume corresponding to each subtitle, and to determine whether or not to display for each subtitle.

  Further, the playback device according to the present invention is characterized by comprising threshold receiving means for receiving the threshold.

  In the present invention, it is possible to accept a threshold value for determining whether or not the sound volume of the audio data is low, and the determination is performed using the received threshold value. Thus, the user can change the determination threshold in consideration of individual differences in viewing environment and listening ability.

  In addition, the playback device according to the present invention includes an output volume receiving unit that receives a setting of an output volume of the sound output by the sound output processing unit, and an output volume that is received by the output volume receiving unit, according to the setting of the output volume. And a threshold value changing means for changing the threshold value.

  In the present invention, when the user operates the volume switch to change the setting of the output volume, the threshold for determining the volume is changed according to the setting of the output volume. When the output volume setting that is actually output is large, the possibility that the user cannot hear the character's conversation or dialogue is low, and when the output volume setting is low, the possibility that the user cannot hear it is high. Therefore, the threshold value is changed according to the setting of the output volume, and the accuracy of the determination as to whether or not the user can hear is increased.

  Further, the playback device according to the present invention is characterized in that the threshold value changing means decreases the threshold value when the output volume is increased, and increases the threshold value when the output volume is decreased. And

  In the present invention, the threshold for determination is lowered when the user increases the output volume setting, and the threshold is increased when the output volume setting is decreased. When the volume of the actually output sound is low, there is a high possibility that the user cannot hear the conversation or dialogue of the characters, so that more subtitles are displayed by raising the threshold. When the volume of the sound actually output is high, it is unlikely that the user can not hear the conversation or dialogue of the characters, so it is difficult to display subtitles by lowering the threshold.

  In addition, the playback device according to the present invention includes an extraction unit that extracts a voice in a human voice frequency band from the voice data, and the determination unit determines whether the volume of the voice extracted by the extraction unit is smaller than the threshold value. It is characterized by determining whether or not.

  In the present invention, the voice of the human voice frequency band is extracted from the voice data. For example, since Japanese falls within a frequency band of about 125 Hz to 1500 Hz, it is possible to extract the conversation or dialogue of the characters from the voice data by extracting the voice in this frequency band. Therefore, the volume of conversation or dialogue can be determined by determining the volume of the extracted voice.

  The playback apparatus according to the present invention further includes external volume determination means for acquiring sound outside the apparatus, and determining whether the volume of the acquired sound is greater than a predetermined external volume threshold, When the external volume determination means determines that the volume of the external sound is high, the caption of the caption data is synthesized with the video of the video data.

  In the present invention, noise such as noise outside the playback apparatus or sound such as noise is acquired, and it is determined whether or not the volume of the acquired sound is greater than a predetermined external volume threshold. Thereby, it can be determined whether or not the viewing environment of the user is an environment where it is easy to hear the voice. As a result of the determination, if the external sound is larger than the external volume threshold value, that is, if the viewing environment is an environment where it is difficult to hear the sound, the video is synthesized and output.

  Further, the playback device according to the present invention is characterized by comprising an external volume threshold value accepting means for accepting the external volume threshold value.

  In the present invention, it is possible to accept an external volume threshold for determining the volume of sound outside the playback device, and the determination is performed using the received external volume threshold. Therefore, the user can change the threshold for determining the external sound volume in consideration of individual differences in viewing environment and listening ability.

  In addition, the playback device according to the present invention includes an output volume receiving unit that receives a setting of an output volume of the sound output by the sound output processing unit, and an output volume that is received by the output volume receiving unit, according to the setting of the output volume. An external volume threshold value changing unit for changing the external volume threshold value is provided.

  In the present invention, when the user operates the volume switch to change the setting of the output volume, the external volume threshold value for determining the volume of the sound outside the playback apparatus is changed according to the setting of the output volume. Even when the external volume is high, if the output volume setting that is actually output is large, it is unlikely that the user can hear the character's conversation or dialogue, and the output volume setting is low. In some cases, there is a high possibility that it will not be heard. Therefore, the external sound volume threshold is changed according to the output sound volume setting to increase the accuracy of determination as to whether or not the user can hear.

  Further, the playback device according to the present invention increases the external volume threshold and decreases the output volume when the external volume threshold changing unit increases the output volume of the sound output by the audio output processing unit. In this case, the external sound volume threshold is decreased.

  In the present invention, when the user increases the output volume setting, the external volume threshold for determination is increased, and when the output volume setting is decreased, the external volume threshold is decreased. If the volume of the audio that is actually output is low, there is a high possibility that the user will not be able to hear the character's conversation or dialogue due to external noise or noise. indicate. If the volume of the audio that is actually output is high, it is unlikely that the user will not be able to hear the conversation or dialogue of the characters even if the external noise or noise is loud. Subtitles are difficult to display.

  In the case of the present invention, when the volume of the volume data is low, a conversation or dialogue that is low in volume and highly likely to be missed by the user is configured by synthesizing and outputting subtitles of the caption data on the video data. Since the user can understand the conversation or dialogue of the characters from the subtitles, there is no need to reset the playback time to re-listen to the conversation or dialogue that the user missed. If you can't, you don't have to worry about the contents of the program. Therefore, the convenience of the playback device can be improved.

  Further, according to the present invention, by determining whether or not the volume of the audio data is low from the average value of the volume during the predetermined determination period, the voice or speech of the characters is interrupted and no sound is output. Since the moment is not erroneously determined to be a low-volume part, captions for conversation or dialogue can be displayed only when appropriate, and the user does not feel bothered by displaying captions.

  In addition, according to the present invention, the average display time of the caption data in the caption data is calculated, and the volume is determined using the period for each average time as the determination period. Since the determination period can be changed according to the length of the conversation or dialogue included, it is possible to display subtitles that are optimal for the movie or program to be played.

  Also, in the case of the present invention, the volume of the audio corresponding to each subtitle is determined by determining the volume using the period from the display start time and the end time of the subtitle data as the determination period. Since it is possible to determine for each subtitle whether or not to display the subtitle, it is possible to display the subtitle at a more appropriate time. Therefore, the user does not feel annoying the display of subtitles.

  Further, according to the present invention, a threshold for determining whether or not the sound volume of the audio data is low can be received from the user, and the determination is performed by the user by using the received threshold. Since the threshold value can be changed, it is possible to perform determination using a threshold value that takes into account individual differences in viewing environment and listening ability, and optimal subtitle display can be performed for each user. Therefore, the convenience of the playback device can be improved.

  Further, according to the present invention, when the output volume setting is changed by the user using a volume switch or the like, the setting for changing the threshold value for determination results in a large output volume setting actually output. Can reduce subtitle display and increase subtitle display when the output volume setting is low, so that it is possible to display subtitles reliably when the user is highly likely not to be able to hear a conversation or dialogue . Therefore, there is no need to re-view the playback time in order to hear the missed conversation or dialogue again, and there is no possibility that the contents of the program will not be understood if re-viewing is not possible.

  Further, according to the present invention, when the user increases the volume, the threshold for determination is decreased, and when the volume is decreased, the threshold is increased. If the user is small and there is a high probability that the user will not be able to hear the conversation or dialogue of the characters, the subtitles can be displayed without fail. There is no need to replay and there is no possibility that the contents of the program will not be understood if re-viewing is not possible. Further, when the volume of the actually output sound is large and the possibility that the user cannot hear the conversation or dialogue of the characters is low, the subtitle is not displayed, so that the user does not feel annoying the display of the subtitle.

  Further, in the case of the present invention, the voice of the human voice frequency band is extracted from the voice data, and it is determined whether or not the extracted voice is small, so that the conversation or dialogue of the characters from the voice data is determined. Since it is possible to extract only the conversation or dialogue of the characters, the volume can be determined, and it can be more reliably determined whether or not the user can hear the conversation or dialogue.

  Further, in the case of the present invention, it is possible to obtain a sound external to the playback device or a sound such as noise and determine whether or not the volume of the acquired sound is greater than a predetermined external volume threshold. Since it is possible to determine whether or not the viewing environment is an environment where it is easy to hear the audio, if the viewing environment is an environment where it is difficult to hear the audio, it is possible to reliably synthesize and output the subtitles on the video, and the user missed There is no need to reset the playback time to re-listen to hear the conversation or dialogue again, and there is no possibility that the contents of the program will not be understood if re-viewing is not possible.

  In the case of the present invention, the external volume threshold for determining the volume of the sound outside the playback apparatus can be received from the user, and the determination is performed by the user by using the received external volume threshold. Because it is possible to change the external volume threshold for the user, it is possible to make a determination using the external volume threshold in consideration of individual differences in viewing environment and listening ability, and to display the optimum caption for each user be able to. Therefore, the convenience of the playback device can be improved.

  Also, according to the present invention, when the user changes the output volume setting by operating the volume switch, the external volume threshold value for determining the sound volume outside the playback device is changed according to the output volume setting. With this configuration, even when the external volume is high, subtitles are displayed when the output volume setting that is actually output is large and it is unlikely that the user will be able to hear the character's conversation or dialogue. Therefore, the user does not feel annoying the display of subtitles. Also, if the output volume setting is small and the possibility that the user cannot hear it is high, subtitles can be displayed reliably, so that the playback time can be reset and replayed to hear the missed conversation or dialogue again. There is no need to view and there is no possibility that the contents of the program will not be understood if re-viewing is not possible.

  Further, according to the present invention, when the user increases the output volume setting, the external volume threshold for determination is increased, and when the output volume setting is decreased, the external volume threshold is decreased. If the volume of the sound output to is high, it is unlikely that the user will not be able to hear the character's conversation or dialogue even if the external noise or noise is loud. However, the display can be reduced, and the user does not feel bothered by the display of subtitles. In addition, when the volume of the sound that is actually output is low and it is highly possible that the user cannot hear the character's conversation or dialogue, it is possible to reliably display subtitles. In order to listen again, there is no need to reset the playback time and re-view, and there is no possibility that the contents of the program will not be understood if re-view is not possible.

(Embodiment 1)
Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing a configuration of a DVD player according to Embodiment 1 of the present invention. The DVD player according to the present embodiment is an integrated DVD player including a liquid crystal display for displaying video and a speaker for outputting sound.

  In the figure, reference numeral 1 denotes a control unit of the DVD player, which controls each part of the DVD player such as the DVD drive 2, the demodulation unit 5, and the reproduction unit 10. The DVD drive 2 includes a pickup 3, a motor 4, and the like. The DVD 100 is irradiated with beam light from the pickup 3 while rotating the mounted DVD 100 by the motor 4, and receives reflected light from the DVD 100 to generate an electrical signal. The data is converted and given to the demodulator 5. The demodulating unit 5 demodulates the given signal into digital data, corrects the error of the data, and gives the data to the separating unit 11 of the reproducing unit 10.

  The playback unit 10 includes a decoder, a buffer, a D / A converter, and the like, and plays back data read from the DVD 100. The digital data demodulated by the demodulator 5 is applied to the separating unit 11 in the reproducing unit 10, and the separating unit 11 separates the given digital data into three parts: video data, audio data, and caption data. The separated video data is supplied to the video decoder 12, and the audio data is supplied to the audio decoder 13. The separated caption data is given to the caption buffer 14 and stored therein.

  The DVD 100 records video and audio data such as movies or dramas, and subtitle data for displaying characters of characters in characters. These video data, audio data, and caption data are recorded on the DVD 100 in a state of being divided into PS (Program Stream) format packets. Each packet is added with a header having information such as the type and size of data in the packet, and the separation unit 11 determines the type of data in the packet from the header of each packet and separates the data. It is like that.

  The video data and the audio data are recorded in a compressed state on the DVD 100, and the video decoder 12 decompresses the video data compressed in the MPEG format and applies the video data to the video buffer 15, and temporarily stores the video data in the video buffer 15. Store. The audio decoder 13 decompresses the audio data compressed in the AC-3 format, gives the audio data to the audio buffer 16, and temporarily stores the audio data in the audio buffer 16. The caption buffer 14, the video buffer 15, and the audio buffer 16 are configured by storage elements such as SRAM, DRAM, or flash memory, for example.

  The video data stored in the video buffer 15 is supplied to the D / A converter 17, and the D / A converter 17 converts the digital video data into an analog video signal. The D / A converter 17 gives the converted video signal to the synthesizer 19. Subtitle data is given to the synthesizing unit 19 from the subtitle buffer 14, and the synthesizing unit 19 synthesizes the subtitle with the video signal and outputs it to the display 27, and displays the video on the display 27. Note that when the DVD 100 does not include subtitle data or when it is not necessary to display subtitle data, the synthesizing unit 19 displays the video signal supplied from the D / A conversion unit 17 without synthesizing the subtitles. 27 for display.

  The audio data stored in the audio buffer 16 is supplied to the D / A converter 18, and the D / A converter 18 converts the digital audio data into an analog audio signal. Further, the D / A conversion unit 18 provides the converted audio signal to the speaker 28 and outputs the audio through the speaker 28.

  The DVD player according to the present embodiment has a function of automatically displaying a corresponding subtitle when the volume of audio data is determined and the volume is low. In order to implement this function, the DVD player includes a volume determination unit 25 that determines the volume of audio data. When the sound data for a predetermined period is stored in the sound buffer 16 of the reproduction unit 10, the sound volume determination unit 25 is given sound data for a predetermined period from the sound buffer 16. The volume determination unit 25 calculates the average value of the volume of the given audio data over a predetermined period, reads out the threshold value for determination stored in the threshold value storage unit 26, and reads out the calculated average value of the volume. The volume is compared with the threshold value to determine the volume of the audio data.

  The determination result of the volume determination unit 25 is given to the control unit 1, and if the volume is smaller than the threshold value, it is highly likely that the user cannot hear the line of characters, so the synthesis unit 19 synthesizes subtitles with the video. Are displayed on the display 27. When the volume is larger than the threshold value, it is unlikely that the user can hear the characters of the characters, so the video is displayed on the display 27 without synthesizing the subtitles by the synthesizing unit 19.

  The DVD player includes an operation unit 31 provided with a plurality of buttons or switches for giving a user an instruction to perform processing such as playback and stop of a DVD. Further, the operation unit 31 is output from the threshold value setting button 32 for changing the threshold value used when the sound volume determination unit 25 performs the determination, that is, the threshold value value stored in the threshold value storage unit 26, and the speaker 28. A volume setting button 33 for increasing / decreasing the sound volume is provided. For example, when the threshold setting button 32 is pressed, a threshold setting screen is displayed on the display 27, and the user operates a cursor key (not shown) of the operation unit 31 while viewing the setting screen to change the threshold. So that you can do it.

  Further, for example, the volume setting button 33 includes two buttons, a button for increasing the volume and a button for decreasing the volume, and the volume can be increased or decreased by pressing these buttons. When the threshold setting button 32 of the operation unit 31 is pressed and the threshold is changed, the control unit 1 changes the threshold stored in the threshold storage unit 26, but the volume setting is changed by the volume setting button 33. In this case, the threshold value of the threshold value storage unit 26 is changed. When the volume output from the speaker 28 is increased by the volume setting button 33, it becomes easier for the user to listen to the characters of the characters. Therefore, the volume determination threshold value is lowered to make it difficult for captions to be displayed. When the volume output from the speaker 28 is reduced, it becomes difficult for the user to hear the characters of the characters, so the threshold for determining the volume is increased to make it easier to display the subtitles.

  FIG. 2 is a timing chart showing an example of processing timings of volume determination and output of video data, audio data, and caption data of the DVD player according to Embodiment 1 of the present invention. In FIG. 2, the horizontal axis represents the time axis, the audio data volume determination timing, the video data output timing, the audio data output timing, and the caption data output timing from the top. In addition, each data is illustrated by being divided every predetermined period (determination period), the volume of audio data is determined for the average volume for each determination period, and subtitle output is also performed for each determination period. It is determined whether or not to output.

  In FIG. 2, the video data is represented by Vi (i = 1, 2,...), The audio data is represented by Si (i = 1, 2,...), And the caption data is represented by Ti (i = 1, 2,...). Show. For example, the audio data corresponding to the video data V1 is S1, and the caption data corresponding to the audio data S1 is T1.

  Video data Vi, audio data Si, and subtitle data Ti read from the DVD 100 are stored in the video buffer 15, audio buffer 16, and subtitle buffer 14, respectively. After the sound data Si for the determination period is stored, the sound volume determination unit 25 calculates the average sound volume of the sound data Si within the determination period, and compares it with the threshold value stored in the threshold value storage unit 26. The sound volume determination unit 25 repeatedly performs determination for each determination period.

  The output processing of the video data Vi stored in the video buffer 15, the output processing of the audio data Si stored in the audio buffer 16, and the output processing of the subtitle data Ti stored in the subtitle buffer 14 are performed according to the volume of the corresponding audio data Si. This is performed after the determination is completed. Therefore, the output processing of the video data Vi, the audio data Si, and the caption data Ti is performed with a delay of about a determination period after the data is read from the DVD 100. In addition, the caption data Ti is combined with the corresponding video data Vi by the combining unit 19 and output to the display 27 only when the volume is lower than the threshold as a result of the volume determination of the corresponding audio data Si.

  For example, in the first determination period in FIG. 2, the sound volume determination of the first audio data S1 is performed. Since there is no video data before the audio data S1, video data, audio data, and caption data are not output in the first determination period. In the second determination period, the sound volume of the audio data S2 is determined, and the video data V1 and the audio data S1 corresponding to the audio data S1 determined in the previous determination period are output. Further, since the average volume of the audio data S1 is larger than the threshold value as a result of the determination, the caption data T1 is not output. Next, in the third determination period, the sound volume of the audio data S3 is determined, and the video data V2 and the audio data S2 corresponding to the audio data S2 determined in the previous determination period are output. Also, as a result of the determination of the audio data S2 performed in the previous determination period, the average volume is smaller than the threshold value, so that the caption data T2 is synthesized with the video data V2 and output. As described above, the volume determination of the audio data Si is performed prior to the output of the video data Vi, the audio data Si, and the caption data Ti, so that the caption data Ti can be output according to the volume of the audio data Si. .

  FIG. 3 is a flowchart showing a processing procedure when the control unit 1 of the DVD player according to Embodiment 1 of the present invention reproduces the DVD 100. Note that FIG. 3 illustrates a flow of processing performed on data in one determination period. Actually, this flow is performed in parallel in a pipeline with respect to data in all determination periods. .

  When reproducing the DVD 100, the control unit 1 reads digital data from the DVD 100 by the pickup 3 and the motor 4 of the DVD drive 2 and the demodulation unit 5 (step S1). Next, the read data is separated into video data, audio data, and caption data by the separation unit 11 (step S2), and the separated video data and audio data are decoded by the video decoder 12 and the audio decoder 13, and the video buffer 15 and the audio buffer 16 (step S3). Note that the caption data is stored in the caption buffer 14 after being separated by the separation unit 11.

  Next, it is checked whether or not audio data for a predetermined determination period is accumulated in the audio buffer 16 (step S4). If audio data for the determination period has not been accumulated (S4: NO), the process returns to step S1 and data is read from the DVD 100. When the sound data for the determination period is accumulated (S4: YES), the sound volume determination unit 25 calculates the average value of the sound volume during the determination period (step S5), and the threshold value for determination from the threshold storage unit 26 Is compared, and the calculated average value of the sound volume is compared with a threshold value to determine the sound data volume (step S6).

  Next, whether or not data corresponding to the previous determination period is being output, that is, video data and caption data corresponding to the previous determination period are displayed on the display 27, and audio data corresponding to the previous determination period is output from the speaker 28. It is checked whether or not it has been performed (step S7). When the data of the previous determination period is being output (S7: YES), the process waits until the output is completed. When the data of the previous determination period is not being output, that is, when the output of the data of the previous determination period is finished (S7: NO), whether or not the average value of the volume of the audio data is smaller than the threshold value from the determination result in step S6. (Step S8).

  When the average value of the volume of the audio data is smaller than the threshold (S8: YES), the subtitle is synthesized with the video and output, that is, the digital video data for the current determination period stored in the video buffer 15 is analog video. The signal is converted into a signal, the corresponding subtitle data is acquired from the subtitle buffer 14, synthesized into a video signal by the synthesizing unit 19, output to the display 27, and digital for the current determination period stored in the audio buffer 16. Audio data is converted into an analog audio signal and output to the speaker 28 (step S9). When the average value of the volume of the audio data is larger than the threshold (S8: NO), the data is output without synthesizing the caption with the video signal (step S10).

  After outputting the data in step S9 or step S10, it is checked whether or not the processing has been completed for all data in the current determination period (step S11). If the processing of all data has not been completed (S11: NO) ), The process returns to step S8, and the data output is continued. If all the data has been processed (S11: YES), the process ends. However, the above processing is processing only for data in one determination period, and actually the control unit 1 performs the same processing for all data to be reproduced. At this time, processing for each data is sequentially performed in parallel in a pipeline manner.

  According to the above procedure, subtitles can be combined with video according to the volume of the audio data and output to the display 27 as shown in FIG. Further, the DVD player according to the present embodiment can change the threshold value to be compared with the average value of the volume of the audio data according to the use situation. The threshold is changed when the user operates the threshold setting button 32 of the operation unit 31 to display the threshold setting screen on the display 27 and changes the threshold on the threshold setting screen, or when the user changes the volume of the operation unit 31. This is performed when the volume is increased or decreased by operating the setting button 33.

  FIG. 4 is a flowchart showing a processing procedure when the control unit 1 of the DVD player according to Embodiment 1 of the present invention performs a threshold value changing process. First, the control unit 1 checks whether or not the threshold setting button 32 of the operation unit 31 has been pressed (step S21). When the threshold setting button 32 is pressed (S21: YES), a threshold setting screen is displayed on the display 27 (step S22).

  FIG. 5 is a display example of the threshold setting screen. For example, on the threshold setting screen, two child windows 121 and 122 are displayed side by side, and a video of about several tens of seconds to several minutes is extracted from the DVD 100 and repeatedly displayed on the upper child window 121, and the lower window is displayed. In the child window 122, the volume of the audio data corresponding to the extracted video is displayed as a graph with the horizontal axis representing time and the vertical axis representing volume. In addition, the child window 122 displays a volume graph and a broken line indicating a volume determination threshold value orthogonal to the vertical axis, and the user operates a cursor key (not shown) provided on the operation unit 31. The threshold value can be changed by moving the broken line up and down, and the setting is completed by pressing a determination key (not shown) provided on the operation unit 31 after the change, and the changed threshold value is reflected. Can do.

  After the threshold setting screen is displayed in step S22, it is checked whether or not the user has pressed the enter key of the operation unit 31 to complete the threshold setting (step S23). If the threshold setting has not been completed (S23: NO), the process returns to step S22 to display a threshold setting screen and wait until the setting is completed. When the threshold setting is completed (S23: YES), the set threshold is acquired (step S24).

  If the threshold setting button 32 is not pressed in step S21 (S21: NO), it is checked whether or not the volume setting has been changed by the volume setting button 33 of the operation unit 31 (step S25). If the volume setting has not been changed (S25: NO), the process returns to step S21 and waits until the threshold setting button 32 is pressed or the volume setting is changed.

  When the volume setting has been changed (S25: YES), it is checked whether the volume has been increased (step S26). When the volume is increased (S26: YES), the threshold is decreased (step S27), and when the volume is not increased, that is, when the volume is decreased (S26: NO), the threshold is increased. (Step S28).

  FIG. 6 is a graph showing the relationship between increase / decrease in volume setting and increase / decrease in threshold. As shown in FIG. 6, the volume setting and the threshold value are increased or decreased in a substantially inversely proportional relationship. When the volume setting is increased, the threshold value is decreased, and when the volume setting is decreased, the threshold value is increased. It is. As a result, when the actual volume output from the speaker 28 is high, the user is likely to be able to hear the dialogue, so the subtitles are not displayed, and when the actual volume is low, the dialogue may be missed. Since it is expensive, subtitles can be displayed reliably.

  After acquiring the threshold set by the user in step S24, after decreasing the threshold in step S27, or after increasing the threshold in step S28, the control unit 1 sets a new threshold in the threshold storage unit 26. Store (step S29), and the process ends. Thereby, when the volume determination unit 25 determines the volume, the new threshold value can be read from the threshold storage unit 26 and the determination can be made.

  In the DVD player configured as described above, the volume of the sound is determined by averaging the audio data for each predetermined determination period and comparing it with a threshold value, and if the determination results in a low volume, the subtitle is synthesized with the corresponding video. Thus, since the display 27 is configured to display the caption, it is possible to display subtitles that are highly likely to be inaudible to the user, and the convenience of the DVD player can be improved. Further, since the user can change the threshold for sound volume determination, the user can set a determination criterion in consideration of the viewing environment and the like. In addition, by adopting a configuration in which the threshold value is changed according to the actual volume setting output from the speaker 28, it is possible to reliably display subtitles when the user is likely to miss the dialogue.

  In the present embodiment, a configuration is shown in which the volume of audio data is determined during playback of the DVD 100. However, the present invention is not limited to this. For example, when the DVD 100 is loaded in the DVD drive 2, the audio data is recorded in advance. A configuration may be adopted in which all the sound volume determinations are performed, the determination results are stored in a memory or the like, and the captions are synthesized with reference to the determination results stored when the DVD 100 is played back. Moreover, although the structure which has both the function in which a user changes the threshold value of a determination and the function to change a threshold value according to the change of a user's volume setting was shown, it is not restricted to this, Only one of them is shown. A configuration having a function may be used, and a configuration in which the threshold value is not changed may be used. In addition, the sound volume is determined every predetermined determination period. However, the present invention is not limited to this. For example, the sound volume may be determined every determination period arbitrarily designated by the user. Moreover, although the structure which performs the determination of a sound volume about all the determination periods was shown, it is not restricted to this, When there is no character line of a character in the audio | voice data within a determination period, ie, there is no corresponding subtitle data In this case, the sound volume may not be determined for the determination period.

  In this embodiment, the DVD player has been described as an example of a playback device. However, the present invention is not limited to this, and the playback device may be a device that plays back a recording medium such as a hard disk, a Blu-ray disc, or an HD-DVD. It may be a device that receives a digital or analog television program including subtitle data by wire or wireless and reproduces it. Further, the configuration in which the display 27 and the speaker 28 are integrally provided in the DVD player is shown, but the present invention is not limited to this, and a configuration in which video and audio are output to an external display and an external speaker may be employed.

(Modification 1)
In the first modification, instead of using a predetermined determination period as a determination period for determining the volume of audio data, the determination period is determined according to the data recorded on the DVD 100 to be reproduced. The structure which performs determination for every determined determination period is shown. FIG. 7 is a flowchart showing the procedure of the determination period determination process performed by the control unit 1 of the DVD player according to the modification of the first embodiment of the present invention.

  The control unit 1 reads digital data from the DVD 100 using the pickup 3 and the motor 4 of the DVD drive 2 and the demodulation unit 5 (step S41). Next, the read data is separated into video data, audio data, and subtitle data by the separation unit 11 (step S42), and the separated video data and audio data are decoded by the video decoder 12 and the audio decoder 13, and the video buffer 15 and the audio buffer 16.

  Next, it is checked whether or not the data separation process has been completed for all data recorded on the DVD 100 (step S43). If not completed (S43: NO), the process returns to step S41 to read and separate the data. To continue. When the data separation process is completed for all data (S43: YES), the caption data stored in the caption buffer 14 is acquired (step S44), the display time of each caption is examined, and the average display time is calculated. (Step S45), and the process ends.

  FIG. 8 is a schematic diagram illustrating a configuration example of caption data stored in the caption buffer 14. The caption data includes information such as a character string that is synthesized and displayed on the video, a display start time of the caption, and a display time for which the caption display is continued from the display start time. Subtitle data is stored in order of display start time. For example, in the example of FIG. 8, the subtitle character string A is synthesized and displayed for 3.11 seconds from the video whose playback time is 1 hour 15 minutes 41.28 seconds, and the subtitle character string B is 1 hour 16 minutes 12.05 seconds. The video is synthesized for 4.49 seconds and displayed. Therefore, the control unit 1 can sum the display times of all the caption data stored in the caption buffer 14 and calculate an average value.

  Through the above processing, the average display time of captions can be calculated from each caption data, and the volume of audio data can be determined using this average time as the determination time. In the flowchart shown in FIG. 7, a configuration is shown in which all data is read from the DVD 100 in advance and separated, and then the average value of the display time is calculated. However, the present invention is not limited to this, and the subtitle buffer 14 is stored. When the capacity is smaller than the total capacity of all subtitle data recorded on the DVD 100, a partial average value or total value is calculated every time a certain amount of subtitle data is stored in the subtitle buffer 14, and all subtitle data is read. After that, the entire average value may be calculated from the partial average value or the total value. Moreover, although the structure which calculates the average value of the display time of all subtitle data was shown, it is not restricted to this, For example, partial values, such as the average value of the display time only of subtitle data from the start to the reproduction time 15 minutes, etc. The average value of the display time of the caption data extracted in the above may be calculated and used as the determination period.

(Modification 2)
In the second modification, a configuration is shown in which the determination period is changed according to the length of the caption data, instead of determining the volume of the audio data in the determination period having a fixed time length. FIG. 9 is a timing chart showing an example of processing timings of volume determination and output of video data, audio data, and caption data of a DVD player according to the second modification of the first embodiment of the present invention. In this example, during the period of the audio data S3 and S5, the character does not utter speech and is silent, or only BGM and sound effects are included in the audio data.

  If the speech data does not include the line of characters, there is no corresponding subtitle data, so there is no need to determine the volume. Therefore, the display start time and display end time of the caption are acquired from the caption data in advance, and the volume is determined only during the period between the start time and the end time. For example, when the DVD 100 is loaded in the DVD drive 2, all subtitle data recorded on the DVD 100 is sequentially read out, the display start time and display end time of each subtitle data are examined, and a list of times for determination is created. These are stored in a memory (not shown). That is, in the flowchart of the first modification shown in FIG. 7, instead of the average time calculation process performed in step S45, a process of creating a list of times for determination from the acquired caption data is performed.

  FIG. 10 is a schematic diagram illustrating an example of a determination period table created from caption data as a list of determination times. The determination period table has information regarding the start time and end time of determination, and caption data corresponding to this period. The determination start time can be obtained from the subtitle display start time included in the subtitle data, and the determination end time can be calculated by adding the subtitle display time to the subtitle start time. When the DVD 100 is played back, the determination period table stored in the memory is read, and the sound volume of the audio data is determined only during the determination period included in the determination period table.

  With the above configuration, it is possible to more reliably determine the level of the line volume corresponding to the caption of each caption data. In this modification, the determination period table includes the determination start time and end time. However, the present invention is not limited to this. For example, the determination period table includes the determination start time and the start time. It may be a configuration. Moreover, the information regarding the caption data corresponding to the start time and the end time may not be included.

(Modification 3)
FIG. 11 is a block diagram showing a configuration of a DVD player according to the third modification of the first embodiment of the present invention. The DVD player shown in FIG. 11 has substantially the same configuration as that of the DVD player shown in FIG. 1 except that an extraction unit 41 is provided.

  The audio data stored in the audio buffer 16 is given to the D / A conversion unit 18, and when audio data for a predetermined determination period is accumulated, the audio data for this period is given to the extraction unit 41. It is done. The extraction unit 41 extracts a voice corresponding to a human voice from the given voice data and gives it to the volume determination unit 25. When a person speaks Japanese, the voice frequency is about 125 Hz to 1500 Hz. By extracting only the voice that falls within this frequency band from the voice data, the voice corresponding to the voice of the person can be extracted. Extraction of data in a specific frequency band from audio data can be performed by, for example, acquiring a frequency distribution by performing Fourier transform on the audio data, and cutting data having a frequency other than the specific frequency band from the acquired frequency spectrum. it can.

  With the above configuration, only the voice of the person in the audio data can be set as the volume determination target, so that it can be determined more accurately whether or not the user can hear the line of the character. Note that the method for extracting a human voice is not limited to the above method, and may be another method.

(Embodiment 2)
FIG. 12 is a block diagram showing a configuration of a DVD player according to Embodiment 2 of the present invention. In the DVD player according to the second embodiment, an external volume determination unit 51, a sound collection unit 52, an external volume threshold storage unit 53, and an external volume threshold setting button 54 are added to the DVD player according to the first embodiment shown in FIG. With this configuration, it is possible to determine the volume of external noise and noise and display subtitles according to the determination result.

  The sound collection unit 52 includes, for example, a microphone and acquires noise such as noise outside the DVD player and noise, and gives the acquired sound to the external volume determination unit 51. The external volume threshold storage unit 53 stores an external volume threshold for determining whether or not the acquired external noise and noise are large. The external volume determination unit 51 reads the external volume threshold stored in the external volume threshold storage unit 53, compares the external sound given from the sound collection unit 52 with the external volume threshold, and the volume of the external sound is high. Is determined, and the determination result is given to the control unit 1. When the volume of the external sound is high from the given determination result, the control unit 1 synthesizes the caption with the video by the synthesizing unit 19 and outputs it to the display 27.

  In addition, the user can display an external volume threshold setting screen on the display 27 by pressing an external volume threshold setting button 54 provided on the operation unit 31, and is provided in the operation unit 31 while this screen is displayed. By operating the cursor key, the enter key, and the like, the external volume threshold value that is a criterion for determining the volume level of the external sound can be changed.

  FIG. 13 is a timing chart showing an example of processing timings of volume determination and external volume determination of the DVD player according to Embodiment 2 of the present invention and output of video data, audio data, and caption data. In FIG. 13, audio data volume determination timing, video data output timing, audio data output timing, subtitle data output timing, and external sound volume determination results are shown from above with the horizontal axis as the time axis. It is. In addition, each data is illustrated by being divided every predetermined determination period, and the sound volume determination is performed on the average sound volume for each determination period. The volume of external sound is always determined.

  Video data Vi, audio data Si, and subtitle data Ti read from the DVD 100 are stored in the video buffer 15, audio buffer 16, and subtitle buffer 14, respectively. After the sound data Si for the determination period is stored, the sound volume determination unit 25 calculates the average sound volume of the sound data Si within the determination period, and compares it with the threshold value stored in the threshold value storage unit 26. The sound volume determination unit 25 repeatedly performs determination for each determination period. The output processing of the video data Vi stored in the video buffer 15, the output processing of the audio data Si stored in the audio buffer 16, and the output processing of the subtitle data Ti stored in the subtitle buffer 14 are performed according to the volume of the corresponding audio data Si. This is performed after the determination is completed. Therefore, the output processing of the video data Vi, the audio data Si, and the caption data Ti is output with a delay of about a determination period after the data is read from the DVD 100.

  The subtitle data Ti corresponds to the corresponding video data Vi when the volume of the corresponding audio data Si is lower than the threshold, and when the volume of noise and noise outside the DVD player is larger than the external volume threshold. Are combined by the combining unit 19 and output to the display 27.

  For example, in FIG. 13, the volume of the audio data S2, S4, and S5 in the second, fourth, and fifth determination periods is smaller than the threshold value. Further, there are periods in which the volume of external noise and noise is larger than the external volume threshold in the output period of the audio data S2 and S3 and the output period of the audio data S5 and S6. Therefore, the caption data T2 is output only during a period when the volume of external noise and noise during the output period of the audio data S2 is high, and the period when the volume of external noise and noise during the output period of the audio data S5 is high. Only the subtitle data T5 is output. During the output period of the audio data S4, since the volume of external noise and noise is low, the caption data T4 is not output.

  14 and 15 are flowcharts showing a processing procedure when the control unit 1 of the DVD player according to Embodiment 2 of the present invention reproduces the DVD 100. FIG. Note that FIG. 14 illustrates a flow of processing performed on data in one determination period. Actually, this flow is performed in parallel with data in all determination periods in a pipeline manner. .

  The control unit 1 reads digital data from the DVD 100 using the pickup 3 and the motor 4 of the DVD drive 2 and the demodulation unit 5 (step S51). Next, the read data is separated into video data, audio data, and caption data by the separation unit 11 (step S52), and the separated video data and audio data are decoded by the video decoder 12 and the audio decoder 13, and the video buffer 15 and the audio buffer 16 (step S53). Note that the caption data is stored in the caption buffer 14 after being separated by the separation unit 11.

  Next, it is checked whether or not audio data for a predetermined determination period is accumulated in the audio buffer 16 (step S54). When the audio data for the determination period is not accumulated (S54: NO), the process returns to step S51, and data is read from the DVD 100. When the sound data for the determination period is accumulated (S54: YES), the sound volume determination unit 25 calculates the average value of the sound volume during the determination period (step S55), and the threshold value for determination from the threshold storage unit 26 Are compared, and the calculated average value of the sound volume is compared with the threshold value to determine the sound volume of the audio data (step S56).

  Next, whether or not data corresponding to the previous determination period is being output, that is, video data and caption data corresponding to the previous determination period are displayed on the display 27, and audio data corresponding to the previous determination period is output from the speaker 28. It is checked whether or not it has been done (step S57). When the data of the previous determination period is being output (S57: YES), the process waits until the reproduction ends. When the data of the previous determination period is not being output, that is, when the output of the data of the previous determination period is finished (S57: NO), whether or not the average value of the volume of the audio data is smaller than the threshold value from the determination result in step S56. (Step S58).

  When the average value of the volume of the audio data is smaller than the threshold (S58: YES), the external volume threshold is read from the external volume threshold storage unit 53, and the volume of external noise and noise collected by the sound collection unit 52 is recorded. Is compared to check whether the volume of the external sound is high (step S59). When the volume of the external sound is high (S59: YES), the digital video data for the current determination period stored in the video buffer 15 is converted into an analog video signal, and the corresponding subtitle data is acquired from the subtitle buffer 14. Then, the video signal is synthesized by the synthesis unit 19 and output to the display 27, and the digital audio data for the current determination period stored in the audio buffer 16 is converted into an analog audio signal and output to the speaker 28. (Step S60). If the volume of the external sound is not high (S59: NO), the synthesizing unit 19 outputs video data and audio data without synthesizing the subtitles (step S61). After performing the output processing of the video data and the audio data in step S60 or S61, it is checked whether or not the output of the data for the current determination period has been completed (step S62), and if not completed (S62: NO) Returning to step S59, the video data and audio data output processing is continued.

  If the average value of the volume of the audio data is not smaller than the threshold value in step S58 (S58: NO), the synthesizing unit 19 outputs the video data and audio data without synthesizing the subtitles (step S63). Next, it is checked whether or not the output of data for the current determination period has been completed (step S64). If it has not been completed (S64: NO), the process returns to step S63, and the output processing of video data and audio data is continued. .

  In step S62 or S64, when the output of the data for the current determination period is completed (S62: YES, S64: YES), the control unit 1 ends the process. However, the above processing is processing only for data in one determination period, and actually the control unit 1 performs the same processing for all data to be reproduced. At this time, processing for each data is sequentially performed in parallel in a pipeline manner.

  In addition, the DVD player according to the second embodiment allows the user to change the external volume threshold for determination by comparing with external noise and the volume of noise or the like according to the usage situation. The external volume threshold is changed by the user operating the external volume threshold setting button 54 of the operation unit 31 to display the external volume threshold setting screen on the display 27 and changing the external volume threshold on the external volume threshold setting screen. Or when the user operates the volume setting button 33 of the operation unit 31 to increase or decrease the volume.

  FIG. 16 is a flowchart showing a processing procedure when the control unit 1 of the DVD player according to Embodiment 2 of the present invention performs the external volume threshold value changing process. First, the control unit 1 checks whether or not the external volume threshold value setting button 54 of the operation unit 31 has been pressed (step S71). When the external volume threshold setting button 54 is pressed (S71: YES), an external volume threshold setting screen is displayed on the display 27 (step S72). After the external volume threshold setting screen is displayed, it is checked whether or not the user has pressed the enter key of the operation unit 31 and the setting of the external volume threshold has been completed (step S73). If the setting of the external volume threshold has not been completed (S73: NO), the process returns to step S72, and the external volume threshold setting screen is displayed and waits until the setting is completed. When the setting of the external volume threshold is completed (S73: YES), the set external volume threshold is acquired (step S74).

  If the external volume threshold setting button 54 has not been pressed in step S71 (S71: NO), it is checked whether or not the volume setting has been changed by the volume setting button 33 of the operation unit 31 (step S75). If the volume setting has not been changed (S75: NO), the process returns to step S71 and waits until the external volume threshold setting button 54 is pressed or the volume setting is changed.

  When the volume setting has been changed (S75: YES), it is checked whether the volume has been increased (step S76). When the volume is increased (S76: YES), the external volume threshold is increased (step S77). When the volume is not increased, that is, when the volume is decreased (S76: NO), the external volume is increased. The threshold value is decreased (step S78).

  After acquiring the external volume threshold set by the user in step S74, after increasing the external volume threshold in step S77, or after decreasing the external volume threshold in step S78, the controller 1 sets the external volume threshold. A new external volume threshold value is stored in the storage unit 53 (step S79), and the process ends. Thereby, when the sound volume determination unit 25 determines the sound volume of external noise and noise, a new external sound volume threshold value can be read from the external sound volume threshold value storage unit 53 and determined.

  In the DVD player having the above configuration, subtitles can be automatically displayed when the volume of noise, noise, etc. outside the apparatus is high. Can be eliminated. In addition, since the user can change the external volume threshold for determination, the determination criterion can be set in consideration of the user's listening ability and the like. In addition, by adopting a configuration in which the external volume threshold is changed in accordance with the actual volume setting output from the speaker 28, it is possible to reliably display the caption when the user easily misses the dialogue.

  In the present embodiment, a configuration in which subtitles are synthesized and output when two conditions are satisfied when the volume of audio data is low and the volume of external noise and noise is high is satisfied. Although shown, it is not restricted to this, It is good also as a structure which outputs a caption, when either one conditions are satisfied. In addition, although the configuration in which the user has both the function of changing the external volume threshold and the function of changing the external volume threshold in accordance with the change of the user's volume setting is shown, the present invention is not limited to this. It may be configured to have only the function, or may be configured to not change the external volume threshold.

  Since the other configuration of the DVD player according to the second embodiment is the same as that of the DVD player according to the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof is omitted.

It is a block diagram which shows the structure of the DVD player which concerns on Embodiment 1 of this invention. 4 is a timing chart showing an example of processing timings of volume determination and output of video data, audio data, and caption data of the DVD player according to Embodiment 1 of the present invention. 6 is a flowchart showing a processing procedure when the control unit of the DVD player according to Embodiment 1 of the present invention reproduces a DVD. It is a flowchart which shows the process sequence in case the control part of the DVD player which concerns on Embodiment 1 of this invention performs a threshold value change process. It is a display example of a threshold setting screen. It is a graph which shows the relationship between increase / decrease in the setting of a volume, and increase / decrease in a threshold value. It is a flowchart which shows the process sequence of the determination period determination process which the control part of the DVD player which concerns on the modification of Embodiment 1 of this invention performs. It is a schematic diagram which shows the structural example of the caption data stored in the caption buffer. It is a timing chart which shows an example of the processing timing of the volume determination of DVD player which concerns on the modification 2 of Embodiment 1 of this invention, and the output of video data, audio data, and subtitle data. It is a schematic diagram which shows an example of the determination period table produced | generated from subtitle data as a list of time which performs determination. It is a block diagram which shows the structure of the DVD player which concerns on the modification 3 of Embodiment 1 of this invention. It is a block diagram which shows the structure of the DVD player which concerns on Embodiment 2 of this invention. It is a timing chart which shows an example of the processing timing of volume determination and external volume determination of DVD player which concerns on Embodiment 2 of this invention, and the output of video data, audio data, and subtitle data. It is a flowchart which shows the process sequence in case the control part of the DVD player which concerns on Embodiment 2 of this invention performs reproduction | regeneration of DVD. It is a flowchart which shows the process sequence in case the control part of the DVD player which concerns on Embodiment 2 of this invention performs reproduction | regeneration of DVD. It is a flowchart which shows the process sequence in case the control part of the DVD player which concerns on Embodiment 2 of this invention performs an external volume threshold value change process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control part 2 DVD drive 10 Playback part 11 Separation part 12 Video decoder (video output processing means)
13 Audio decoder (Audio output processing means)
14 subtitle buffer 15 video buffer 16 audio buffer 17 D / A converter (video output processing means)
18 D / A converter (audio output processing means)
19 Synthesizer (synthesizer)
25 Volume determination unit (determination means)
26 Threshold storage unit 27 Display 28 Speaker 31 Operation unit 32 Threshold setting button 33 Volume setting button (output volume receiving means)
41 Extraction unit (extraction means)
51 External volume determination unit (external volume determination means)
52 Sound Collection Unit 53 External Volume Threshold Storage Unit 54 External Volume Threshold Setting Button

Claims (12)

In a playback device for playing back viewing data including video data, audio data and caption data,
Determining means for determining whether or not a volume of the audio data is smaller than a predetermined threshold;
Synthesizing means for synthesizing the caption of the corresponding caption data to the video of the video data corresponding to the audio data determined to be low by the determination means;
Video output processing means for performing processing related to the output of the video combined with subtitles;
And a sound output processing means for performing processing related to output of sound corresponding to the video output by the video output processing means.   2. The playback apparatus according to claim 1, wherein the determination unit calculates an average value of sound volume of a predetermined determination period and compares the calculated average value with the threshold value to perform determination. Obtaining means for obtaining a display time of the caption of the caption data;
A calculation means for calculating an average time of the acquired display time,
The reproducing apparatus according to claim 2, wherein the determination unit performs the determination using the period for each average time calculated by the calculation unit as the determination period. An acquisition means for acquiring a display start time and a display end time of the caption of the caption data;
The reproducing apparatus according to claim 2, wherein the determination unit performs the determination using the period from the display start time acquired by the acquisition unit to the display end time as the determination period.   The playback apparatus according to claim 1, further comprising a threshold receiving unit that receives the threshold. Output volume receiving means for receiving the setting of the output volume of the sound output by the sound output processing means;
6. The playback device according to claim 1, further comprising: a threshold value changing unit that changes the threshold value according to an output volume setting received by the output volume receiving unit.   7. The playback apparatus according to claim 6, wherein the threshold value changing unit decreases the threshold value when the output sound volume is increased, and increases the threshold value when the output sound volume is decreased. Comprising extraction means for extracting voice in a human voice frequency band from the voice data;
The playback apparatus according to any one of claims 1 to 7, wherein the determination unit determines whether or not a volume of the sound extracted by the extraction unit is smaller than the threshold value. An external volume determination means for acquiring a sound external to the apparatus and determining whether the volume of the acquired sound is greater than a predetermined external volume threshold;
9. The method according to claim 1, wherein the synthesizing unit synthesizes the caption of the caption data with the video data when the external volume determination unit determines that the volume of the external sound is high. The reproducing device according to one.   The playback apparatus according to claim 9, further comprising an external volume threshold receiving unit that receives the external volume threshold. Output volume receiving means for receiving the setting of the output volume of the sound output by the sound output processing means;
11. The playback apparatus according to claim 9, further comprising: an external volume threshold value changing unit that changes the external volume threshold value according to the setting of the output volume received by the output volume reception unit.   The external volume threshold changing unit increases the external volume threshold when the output volume of the sound output by the audio output processing unit is increased, and decreases the external volume threshold when the output volume is decreased. The playback apparatus according to claim 11, which is configured as described above.

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