JP3948068B2 - Information signal processing apparatus and information signal processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an information signal processing apparatus that extracts and processes character information from an information signal including at least video information and character information and a video signal to which character information is added.as well asThe present invention relates to an information signal processing method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an optical disc that optically records information signals such as video and audio on a recording layer of the disc has been provided. Examples of these optical disks include analog video disks, video CDs, digital video disks, so-called DVDs, and the like.
[0003]
Here, as an example of an analog disk, an optical disk with a diameter of 30 cm for recording video and audio for 60 minutes on one side in an analog manner is known. A video CD is an optical disk having a diameter of 12 cm obtained by expanding a so-called CD so as to correspond to an image by a digital method. A DVD is an optical disc having a diameter of 12 cm that records video and audio on one or two recording layers provided on one or both sides.
[0004]
Character images corresponding to character information such as subtitles, other explanatory texts, and texts may be added to the video recorded on these optical disks, that is, encoded. These character information is displayed on a part of the screen to provide various information when the video is displayed on a display screen in a television receiver or the like. Such character information or Closed Caption (CC) is said. This character information includes a character code and a control code. An example of the character code is a so-called ASCII code.
[0005]
Here, the character information is recorded in a mode unique to the type of the optical disc. That is, in the analog disk, character information is included in 2 bytes each in the 21st line and / or the 284th line of the blank period of the video signal. In a video CD, character information may be included in the 21st line and / or 284th line of the blank period of the video signal as in the case of the analog disc, and may be recorded as character information separately from the video signal. . In DVD, character information is recorded separately from video information.
[0006]
An example of the case where the character information is included in the video signal is, as shown in FIG. 15A, unlike the normal line shown in FIG. 15B, the character C1 and the character C2 are each 1 byte. It is encoded with.
[0007]
On the other hand, a television receiver having a so-called character multiplexing function is provided. Such a television receiver has a function of decoding a character code included in the 21st line and / or the 284th line of the blank period of the video signal and displaying it as a character string on a part of the display screen. .
[0008]
Here, FIG. 16 shows an example of a display mode of character information in a television receiver having a character multiplexing function. In the television receiver 17, the character information encoded in the 21st line L21 and / or the 284th line L284 is displayed in the first line R1 to the 15th line R15 of the effective screen on the display screen 17a. Yes.
[0009]
To display video and character information read from a medium in which character information is recorded separately from a video signal, such as the above-mentioned DVD or some video CDs, on a television device having the above-described character multiplexing function. Therefore, it is necessary to encode the character information into a video signal.
[0010]
Therefore, in an information signal processing apparatus that reads an information signal from a DVD or the like and processes the information signal, a video signal that encodes character information corresponding to the video is supplied to the 21st line L21 and / or the 284th line L284. ing.
[0011]
  On the other hand, even in a television receiver having a character multiplexing function, character information can be displayed only in a reproduction state. Also, at the beginning of random access, the display of character information may be disturbed.
[0012]
[Problems to be solved by the invention]
As described above, the character information is encoded as the character code in the 21st line L21 and / or the 284th line L284 in the blank period of the video signal. In the aspect, the character information is normally displayed corresponding to the video.
[0013]
However, for example, in random access, a part of the character information corresponding to the video and a part of the character information corresponding to the video reproduced immediately before are displayed. In the pause, a part of the character information corresponding to the image is repeatedly displayed. A part of the character information is repeatedly displayed a fixed number of times in both the forward direction throw and the reverse direction throw.
[0014]
That is, according to the character code encoding of the character information corresponding to the video in the information processing apparatus, the character information is not normally displayed during special reproduction such as random access, pause, forward slow, reverse slow, etc. There was a problem.
[0015]
  The present invention is proposed in view of the above-described circumstances, and is an information signal processing device that provides a video signal for displaying character information normally even in special reproduction.as well asAn object is to provide an information signal processing method.
[0016]
[Means for Solving the Problems]
  In order to solve the above-described problems, an information signal processing apparatus according to the present invention includes an extracting unit that extracts character information from an information signal including at least a video signal and character information, and an adding unit that adds the character information to the video signal. And control means for controlling the additional means and rewriting the character code of the character information to the control code at the time of special reproduction.When the special reproduction is slow forward, the adding means adds the character information corresponding to one field to the video signal for the first time when the same field of the video is repeatedly sent. Add non-output codeIs.
[0017]
In the information signal processing apparatus, the adding means adds the character information to the 21st line L21 and / or the 284th line L284 within the blanking period of the video signal.
[0018]
  In the information signal processing apparatus, when the special reproduction is paused, the control code is a non-output code.sois there.
[0019]
Further, in the information signal processing apparatus, when two control codes appear in the character information in succession, the second control code is not sent, and when the special reproduction is random access, the adding means A control code for erasing character information stored in the buffer is added.
[0020]
  In order to solve the above-described problems, the present invention relates toinformationThe signal processing deviceExtracting means for extracting character information from an information signal including at least a video signal and character information; an adding means for adding the character information to the video signal; and controlling the adding means. Control means for rewriting the control code, and when the special reproduction is random access, the character information is added to the video signal after the control code appears in the character information.Is.
[0021]
  In order to solve the above problems, a video signal processing method according to the present invention includes a step of extracting character information from an information signal including at least a video signal and character information, and a step of adding the character information to the video signal. And a process of rewriting character information into control codes during special playbackWhen the special playback is forward slow, the adding process adds the character information corresponding to one field to the video signal for the first time when the same field of the video is repeatedly sent. Add non-output codeIs.
[0022]
In the information signal processing method according to the present invention, the adding means adds the character information to the 21st line L21 and / or the 284th line L284 within the blanking period of the video signal.
[0023]
  In the information signal processing method, when the special reproduction is paused, the control code is a non-output code,In the information signal processing method, when two control codes appear in succession in the character information, the second control code is not sent, and when the special reproduction is random access, in the additional step, in the buffer. A control code for deleting the stored character information is added.
[0024]
  In order to solve the above problems, a video signal processing method according to the present invention includes a step of extracting character information from an information signal including at least a video signal and character information, and a step of adding the character information to the video signal. A step of rewriting character information into a control code at the time of special reproduction. When the special reproduction is random access, the character information is added to the video signal after the control code appears in the character information.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an information signal processing device, a video signal processing device, and an information signal processing method according to the present invention will be described below with reference to the drawings.
[0026]
As shown in FIG. 1, an information signal processing apparatus or video signal processing apparatus according to the present invention is supplied with a pickup 2 for reproducing an RF signal from an optical disc 1 and an RF signal reproduced by the pickup 2, and An RF circuit 3 that performs binarization processing, a data decoder 4 that is supplied with playback data from the RF circuit 3 and performs decoding processing such as error correction, and the playback data that has been decoded by the data decoder 4 is compressed into the main video And a demultiplexer 5 that distributes data, sub-picture compressed data, and audio compressed data.
[0027]
The apparatus also includes a video decoder 6 that decompresses the main video compressed data, a sub video decoder 7 that decompresses the sub video compressed data and combines it with the main video data, and an audio decoder 8 that decompresses the audio compressed data. A digital / NTSC / PAL conversion circuit (hereinafter simply referred to as an NTSC conversion circuit) 9 is supplied with video data obtained by synthesizing main video data and sub-video data from the sub-video decoder 7 and converts the video data into an NTSC signal or PAL signal. And a digital / analog conversion circuit (hereinafter simply referred to as a D / A conversion circuit) 10 which is supplied with audio data from the audio decoder 8 and converts it into an analog signal.
[0028]
This device also includes a controller 11 for controlling the pickup 2, RF circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9 and A / D conversion circuit 10. And the controller 11, a user interface 12 that mediates user operation input, and a memory 13 that serves as a data storage unit of the controller 11.
[0029]
This apparatus reproduces a read-only, write-once, and rewritable DVD disc and a DVD-VIDEO disc as the optical disc 1.
[0030]
The pickup 2 reproduces an RF signal from the optical disc 1 and supplies it to the RF circuit 3.
[0031]
The RF circuit 3 equalizes and binarizes the waveform of the RF signal to generate digital data and its synchronization signal. Digital data or the like generated by the RF circuit 3 is supplied to the data decoder 4.
[0032]
The data decoder 4 performs processing such as data demodulation and error correction based on the digital data generated by the RF circuit 3. The digital data demodulated by the data decoder 4 is supplied to the demultiplexer 5.
[0033]
The data decoder 4 detects system information in the MPEG2 format, parameter information included in a pack header, etc., predetermined information included in a navigation pack (Navigation Pack; NV_PCK) in the DVD format, and the like. The detected parameter information and the like are supplied from the data decoder 4 to the controller 11.
[0034]
The data decoder 4 has a track buffer 4a at the digital data output stage. The track buffer 4a absorbs the difference in processing speed between the data decoder 4 and the demultiplexer 5.
[0035]
The demultiplexer 5 divides the digital data subjected to the error correction decoding process or the like by the data decoder 4 into main video compressed data, sub video compressed data, and audio compressed data.
[0036]
Here, the main video compressed data is video data compressed by the MPEG2 method, and is, for example, a video stream in a DVD format. The sub-picture compressed data is data such as a caption image synthesized with the main video, and is, for example, a sub-picture stream in the DVD format. The audio compression data is audio data compressed by a method such as MPEG2, and is an audio stream in the DVD format.
[0037]
The demultiplexer 5 supplies the main video compressed data to the video decoder 6, supplies the sub video compressed data to the sub video decoder 7, and supplies the audio compressed data to the audio decoder 8.
[0038]
The video decoder 6 performs decoding processing of the main video compressed data, and generates main video data expanded by the decoding processing. The video decoder 6 has a memory for three screens in order to perform a decoding process. That is, an I picture (Intra encoded image), a P picture (Predictive encoded image), and a B picture (Bidirectionally encoded image) in the MPEG2 format are decoded and stored in the memory of the video decoder 6 and further decoded. Each picture is output from this memory. Note that this memory is not limited to three screens and may have more capacity. The video decoder 6 supplies the generated main video data to the sub video decoder 7.
[0039]
The sub-picture decoder 7 performs a decoding process on the sub-picture compressed data, and synthesizes the decoded sub-picture data with the main picture data supplied from the video decoder 6 to generate video data. That is, the sub video decoder 7 synthesizes a subtitle image or the like reproduced as sub video data with the main video. The sub video decoder 7 outputs the main video data as it is as video data when there is no sub video data. The sub video decoder 7 supplies the generated video data to the NTSC conversion circuit 9.
[0040]
The audio decoder 8 decodes the audio compression data to generate decompressed audio data. That is, if the audio compressed data is compressed in the MPEG2 format, the audio decoder 8 performs an expansion process corresponding to this and generates audio data. If the audio data is encoded in a format such as PCM in addition to the MPEG2 format, a decoding process corresponding to this is performed. The audio decoder 8 supplies the generated audio data to the A / D conversion circuit 10.
[0041]
The NTSC conversion circuit 9 converts the video data from digital data into a television signal such as NTSC or PAL and outputs it. By supplying this output to a monitor or the like, the user can view the video reproduced from the recording medium 1.
[0042]
The A / D conversion circuit 10 converts audio data that is digital data into analog audio data and outputs the analog audio data. By supplying this output to a speaker or the like, it is possible to view the video reproduced from the recording medium 1 by the user.
[0043]
The controller 11 controls the pickup 2, RF circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9 and A / D conversion circuit 10.
[0044]
The controller 11 receives an operation input via an operation panel or a user interface 12 which is a remote controller, and controls each circuit based on the operation input.
[0045]
The controller 11 stores each control data in the memory 13 and controls each circuit based on the data stored in the memory 13.
[0046]
As shown in FIG. 2, a DVD-VIDEO disc manages main video data, sub-video data, and audio data in units of video object sets (VOBS). This VOBS is a unit of, for example, one movie work. This VOBS is composed of a plurality of video objects (VOB). This VOB is a unit in which each data is recorded as a group on the disc. The VOBS is composed of a plurality of cells. This cell is a unit of one scene or one cut in a movie, for example, and one cell is a unit of time from several minutes to several tens of minutes. Also, with DVD, for example, a function such as a multi-story format that allows one movie to be viewed in multiple story developments or a function that skips unfavorable educational scenes such as a so-called parental lock violent scene. This function is created by the combination of the cells.
[0047]
The cell is composed of a plurality of video object units (VOBU). This VOBU is a unit of 0.4 to 1.2 seconds in a moving image, and a plurality of GOPs (Group Of Pictures) in the MPEG2 format are included in this VOBU.
[0048]
The VOBU includes a navigation pack NV_PCK which is a pack having management information of the VOBU, a video pack (Video Pack; V_PCK) which is a pack having main video, and an audio pack (Audio Pack; A_PCK which is a pack having audio data). ) And a sub-picture pack (SP_PCK) that is a pack having sub-picture data. The video pack V_PCK, audio pack A_PCK, and sub-picture pack SP_PCK are each compressed on a recording medium 1 after being compressed in a format such as MPEG2.
[0049]
Next, the correspondence between the video and the character information will be described with reference to FIG.
The video displayed on the display screen 17a of the television receiver 17 corresponds to the fields indicated by F1 to F8 in the figure in the video signal. The video signal is composed of a series of these fields, and during normal playback such as play, the video on the display screen 17a is sequentially displayed in units of fields.
[0050]
The field of the video signal is composed of lines such as horizontal scanning lines, but not all of these lines correspond to the effective screen, and a part corresponds to a blank period that is not displayed on the screen.
[0051]
Since the above-mentioned 21st line L21 is equivalent to this blank period, there is room for writing information other than video in this line. Therefore, a 2-byte character code is encoded in the 21st line L21 as character information.
[0052]
In the figure, each 2 bytes of the character information is displayed corresponding to each field. That is, “Hi! Jon.” Is an ASCII code of 1 byte each, and “Flip” is a 2-byte control code. The meaning of “Flip” will be described later.
[0053]
These character information is stored in each field of the video signal as shown in “Hi” in (a), “Hi!” In (b), and “Hi! Jon.” In (c) in FIG. Are sequentially decoded and stored in the buffer.
[0054]
After the character information is accumulated in the buffer, it is displayed on a part of the video on the display screen 17a of the television receiver 17, as shown in FIG. The character information in the figure is a scene in which one person greets the other person with “Hi! Jon.”.
[0055]
Further, the character information can be displayed in the window 17b of FIG. 5C, and further this window 17b can be displayed on the display screen 17a as shown in FIG. 5B.
[0056]
Next, an information signal processing method for generating a video signal that normally displays character information corresponding to the video on the display screen 17a of the television receiver 17 in the case of a pause will be described.
[0057]
In normal reproduction such as play as shown in (a) of FIG. 6, the field of the video signal is sent in order of F1, F2, and F3. In each field, character information is encoded.
[0058]
  On the other hand, in the pause, as shown in FIG. 6B, the same field F1 or F2 is repeatedly sent except that one frame is sent halfway. In such a case, if the character information corresponding to each field is encoded as it is, the character information is repeatedly displayed according to the repeated sending of these fields.
[0059]
In order to prevent such a problem, it is necessary to perform certain processing on the character information encoded into the video signal. That is, the character information corresponding to the field is encoded only for the first time, and thereafter, the non-output code “NOP” is sent unless the field is changed.
[0060]
Here, in FIG. 6B, the non-output code “NOP” has a width of 2 bytes (1 word), but may be a 1-byte code.
[0061]
On the other hand, when the video is advanced by one frame, that is, when the field is advanced by 1, the character information is encoded in the changed field as shown in FIG. As long as the non-output code “NOP” is encoded.
[0062]
By such an operation, when the video is advanced by one frame, it is possible to avoid the redundant display of the character information on the display screen 17a of the television receiver 17.
[0063]
Subsequently, a forward direction throw in which an image is slowly transmitted in the positive direction will be described.
In a play that is a normal reproduction, as shown in FIG. 7A, the field of the video signal is sequentially sent one frame at a time.
[0064]
On the other hand, in the forward throw, as shown in FIG. 7B, the same field is repeated, for example, four times. In such a case, the non-output code “NOP” is encoded in the character information of the field after the second time so that the character information corresponding to the field is not repeatedly displayed.
[0065]
By the way, a control code for performing display control of character information or the like is 2 bytes, and one control code is sent to one field. Such a control code may be sent twice consecutively depending on the format. However, in the example of the character multiplex decoder, the second control code is ignored.
[0066]
However, in the case of a slow motion, if a non-output code is output after the first control code and a second control code is output after that, there is a risk of malfunction. Therefore, the second control code, more precisely, the even-numbered control code is not sent.
[0067]
This is because the second control code is ignored by the decoder in the same continuous control code, so the non-output code “NOP” is once encoded. It is because it does not recognize.
[0068]
On the other hand, at the time of random access, since it is displayed from the middle of a series of character information, there is a possibility that the display is disturbed. Therefore, the buffer memory is cleared and display of character information is prohibited until a new control code is sent.
[0069]
That is, the “display memory erase” control code is encoded into the 21st line L21 and / or the 284th line L284 for both the first channel and the second channel. Subsequently, the “non-display memory erase” control code is encoded into the 21st line L21 and / or the 284th line L284 for both the first channel and the second channel. Then, the “text restart” control code is encoded into the 21st line L21 and / or the 284th line L284 for both the first channel and the second channel. The channel will be described later.
[0070]
After random access, encoding is not performed on the 21st line L21 and / or the 284th line L284 until a control code of any channel is found for each field. This prevents incomplete display.
[0071]
Further, at the time of random access, by adding character information to the video signal after the control code appears in the character information, that is, encoding, it is possible to prevent incomplete disordered display.
[0072]
Here, the video signal field and the character information channel encoded in the field will be described.
[0073]
The video included in the video signal has the above-described field as a unit, and one set of two of these fields (hereinafter referred to as a first field and a second field) constitutes one frame. This frame corresponds to one period of the video signal.
[0074]
The 21st line L21 and the 284th line L284 in which the character information is encoded correspond to the blank period of the first field and the second field, respectively.
[0075]
So far, in order to simplify the explanation, a series of character information has been explained as being sent every field. However, in an actual character multiplex format, characters in different channels are used in the first field and the second field. Information is being transferred. That is, the relationship between the field and the character information is as shown in FIG.
[0076]
That is, the character information is independently encoded for the 21st line L21 corresponding to the first field such as F1, F3, F5 and the 284th line L284 corresponding to the second field such as F2, F4, F6. Can be For example, even in the first field, character information of different channels such as character information CC1 and character information CC2 can be encoded depending on the field.
[0077]
Here, a channel for character information or the like that can be encoded in the first field and the second field will be described.
[0078]
As the first channel corresponding to the first field, two of character information CC1, character information CC2, text T1, and text T2 can be selected as shown in FIG. As the second channel corresponding to the second field, two of character information CC3, character information CC4, text T3, text T4, and extension data EDS can be selected.
[0079]
In this way, character information and text are multiplexed in each field. The actual character data following the control code having the identifier of each channel is the data of that channel, which continues until the control code of another channel appears.
[0080]
If it is known in advance that it will not be used in the character information CC1, character information CC2, text T1, text T2, it is used by changing the order of encoding the control codes for erasure. Even if the control code of a channel that does not occur is finally encoded, it is possible to prevent imperfect display.
[0081]
Conversely, when erasing control codes are encoded in all channels, the control codes may be encoded in any order.
[0082]
Here, text is a mode in which character strings are displayed in order without being stored in a buffer. In the case of random access, a restart code (Start Text command) is given so as not to disturb the display of the text. When this restart code is given, the displayed text is once erased.
[0083]
The extended data is data that is extended to other than ordinary codes such as ASCII code.
[0084]
As described above, the character information is once stored in the buffer and then displayed on the display screen 17a. This apparatus is also provided with a buffer for storing character information corresponding to the above-described four-channel character information as shown in FIG.
[0085]
In the figure, buffer 21 corresponds to character information CC1, buffer 22 corresponds to character information CC2, buffer 23 corresponds to character information CC3, and buffer 24 corresponds to character information CC4.
[0086]
Each of these buffers is composed of two buffers. One of these two buffers is a display buffer in which the contents of the buffer are displayed on the display screen 17a, and the other is a non-display buffer that is not displayed.
[0087]
Character information is sequentially stored in the non-display buffer, and when this storage ends, the non-display buffer is switched to the display buffer. This switching is performed by the control code “Flip”.
[0088]
Next, a series of process steps of the method signal processing relating to the character information as described above at the time of pause will be described with reference to the flowchart of FIG.
[0089]
In step S <b> 101, a pause command is issued from the user interface 12 to the controller 11. In other words, a pause instruction given by the user is transmitted to the controller 1 via the user interface 12. When this operation ends, the process proceeds to step S102.
[0090]
In the next step S102, the controller 11 pauses the video decoder 6, the sub video decoder 7, and the audio decoder 8. This stops the flow of video information and the like. When this operation ends, the process proceeds to step S103.
[0091]
In the next step S103, when it is confirmed that each decoder has paused, the controller 11 gives the character information of the NTSC encoder 9 to the encoding block together with the 21st line L21 and the 284th line L284, and a non-output code. Thereby, the display of character information is substantially suppressed. When these operations are completed, the process proceeds to step S104.
[0092]
In the next step S104, the character information encoding block encodes the non-output code in the 21st line L21 and the 284th line L284. As a result, one cycle of the video signal was generated. When this operation is finished, this series of steps is finished.
[0093]
As described above, at the time of a pause, the flow of video information and the like is stopped, and a non-output code is encoded in the video information.
[0094]
Next, a series of information signal processing steps for sending one frame will be described with reference to a flowchart shown in FIG.
[0095]
In step S <b> 201, a one-frame advance command is issued from the user interface 12 to the controller 11. That is, a user instruction is transmitted to the controller 1 via the user interface 12. Then, the process proceeds to the next step S202.
[0096]
In the next step S202, the controller 11 advances the video decoder 6, the sub video decoder 7, and the audio decoder 8 by one frame. That is, work corresponding to one field of the video signal is performed, and the process proceeds to step S203.
[0097]
In the next step S203, the data to be encoded in the 21st line L21 is the data encoded in the 21st line L21 immediately before, and the data branches according to the condition that they are control codes (control codes). If this condition is satisfied, “YES” is selected and the process proceeds to step S205. If this condition is not satisfied, “NO” is determined and the process proceeds to step S204.
[0098]
In step S204, the controller 11 gives data to be displayed next to the character information encoding block of the NTSC encoder 9, and proceeds to the next step S206.
[0099]
In step S205, the controller 11 gives a non-output code to the character information encoding block of the NTSC encoder 9. Then, the process proceeds to the next step S204.
[0100]
In step S206, the process branches based on the condition that the data to be encoded (encoded) in the 284th line L286 is the same as the data encoded in the 284th line L284 immediately before and is a control code. If this condition is satisfied, “YES” is selected and the process proceeds to step S207. If this condition is not satisfied, “NO” is determined and the process proceeds to step S208.
[0101]
In step S207, the controller 11 gives data to be output next to the character information encoding block of the NTSC encoder 9, and this series of steps is completed.
[0102]
In step S208, the controller 11 gives a non-output code to the character information encoding block of the NTSC encoder 9. Then, the process proceeds to step S207.
[0103]
As described above, in the series of steps for sending one frame, when the character information encoded immediately before in the 21st line L21 and the 284th line L284 is a control code, it is not sent twice. . In other cases, character information is sent.
[0104]
Here, a series of steps related to the forward throw will be described with reference to a flowchart shown in FIG.
[0105]
In step S301, processing for sending one frame is performed. When this process ends, the process proceeds to step S302.
[0106]
In step S302, the process branches depending on the condition that the forward slow is continued. If this condition is satisfied, “YES” is determined, and the process proceeds to step S303. If this condition is not satisfied, "NO" is determined and this series of steps is terminated.
[0107]
In step S303, the process waits for a predetermined time. And when this fixed time passes, it will progress to step S301.
[0108]
In this way, in the forward direction throw, the difference is that step S303 waiting for a certain time is added to the normal play.
[0109]
Next, a series of steps according to the information signal processing method when a play that is a normal reproduction is started after random access will be described with reference to a flowchart shown in FIG.
[0110]
In step S401, the controller 11 adds each control code for erasing the character information of CC1, CC2, CC3, CC4, T1, T2, T3, and T4 to the NTSC encoder 9. Then, the process proceeds to next Step S402.
[0111]
In step S402, the process branches depending on the condition that the first character information data is data for the 21st line L21. That is, when this condition is satisfied, “YES” is determined and the process proceeds to step S403. If this condition is not satisfied, "NO" is determined and the process proceeds to step S406.
[0112]
In step S403, the character information data for the 21st line L21 branches based on the condition that there is no control code since the start of reproduction after random access, and that the data to be encoded next is not the control code. That is, when this condition is satisfied, “YES” is determined and the process proceeds to step S404. If this condition is not satisfied, "NO" is determined and the process proceeds to step S405.
[0113]
In step S404, the controller 11 gives a non-output code to the NTSC encoder 9. When this operation is completed, the process proceeds to step S406.
[0114]
In step S404, the controller 11 provides the NTSC encoder 9 with data to be encoded next. When this operation is completed, the process proceeds to step S406.
[0115]
In step S406, the character information data for the 284th line L284 branches off under the condition that there is no control code since the start of reproduction after random access, and the data to be encoded next is not a control code. That is, when this condition is satisfied, “YES” is determined and the process proceeds to step S407. If this condition is not satisfied, "NO" is determined and the process proceeds to step S408.
[0116]
In step S407, the controller 11 gives a non-output code to the NTSC encoder 9. When this operation is completed, the process proceeds to step S403.
[0117]
In step S408, the controller 11 gives the NTSC encoder 9 data to be encoded next. When this operation is completed, the process proceeds to step S403.
[0118]
As described above, in the series of procedures at the start of playback, there is a possibility that the context disappears when the character information is displayed halfway, so the character information is not displayed after the control code for separating the character information appears. Output.
[0119]
By the way, the present invention can be applied not only to the digital video information signal as described above but also to an analog video signal.
[0120]
That is, when the present invention is applied to a video signal processing apparatus that processes an analog video signal to which character information is added, the character information rewriting means for rewriting the character information and the character information rewriting means are controlled to perform special reproduction. In some cases, control means for rewriting the character code of the character information into a control code may be provided.
[0121]
Here, the adding means adds character information on the 21st line L21 and / or the 284th line L284 within the blanking period of the video signal.
[0122]
When the special reproduction is paused, the control code is a non-output code. When the special reproduction is slow forward, the adding means adds a non-output code after adding one word of character information to the video signal when sending one frame of video. When two control codes appear successively in the character information, the second control code is not sent. Furthermore, when the special reproduction is random access, the adding means adds a control code for erasing the character information stored in the buffer, and adds a non-output code until the control code for the character information appears. To do.
[0123]
【The invention's effect】
As described above, the information signal processing apparatus, the video signal processing apparatus, and the information signal processing method according to the present invention are not limited to normal reproduction but also in special reproduction such as slow, pause, random access, etc. A video signal is displayed so that character information corresponding to the video is normally displayed on the display screen of the television receiver having the above.
[0124]
Therefore, the information signal processing apparatus can perform special reproduction while displaying character information corresponding to the video, thereby reducing the burden on the operator and improving the work efficiency.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an information processing apparatus or a video signal processing apparatus.
FIG. 2 is a data structure diagram showing a data structure of a DVD-VIDEO disc which is an example of a medium for supplying an information signal to the device.
FIG. 3 is a timing chart showing the relationship between video information fields of the information signal and character information.
FIG. 4 is a diagram schematically showing a state in which the character information is accumulated in a buffer.
FIG. 5 is a diagram showing an image on which character information is superimposed and displayed on a display screen of a television receiver included in the apparatus.
FIG. 6 is a timing chart showing the relationship between the field and character information in a pause state.
FIG. 7 is a timing chart showing the relationship between the field and character information in the forward direction slow state.
FIG. 8 is a timing chart showing the relationship between the field of the video signal and various character information.
FIG. 9 is a diagram showing types of character information encoded in a video signal according to the apparatus.
FIG. 10 is a diagram schematically showing a buffer for storing character information.
FIG. 11 is a flowchart showing a series of procedures of an information signal processing method in a pause state.
FIG. 12 is a flowchart showing a series of procedures of an information signal processing method when an image is advanced by one frame.
FIG. 13 is a flowchart showing a series of procedures of the information signal processing method in the forward direction slow state.
FIG. 14 is a flowchart showing a series of procedures of an information signal processing method at the start of reproduction.
FIG. 15 is a timing chart showing video signal lines;
FIG. 16 is a diagram schematically illustrating a relationship between video signal lines and text or character information displayed on a display screen of a television receiver.
[Explanation of symbols]
  1 optical disc, 5 demultiplexer, 6 video decoder, 7 sub-picture decoder, 8 audio decoder, 9 digital / NTSC, PAL conversion circuit, 17 television receiver

Claims (12)

Extracting means for extracting character information from an information signal including at least a video signal and character information;
Adding means for adding the character information to the video signal;
Control means for controlling the additional means, and rewriting the character code of the character information into a control code at the time of special reproduction,
If the special playback is forward slow, the addition means can be obtained by adding the character information corresponding to one field video signal in sending repeat the same field of the video only the first time, for the field to be repeated An information signal processing apparatus characterized by adding a non-output code.   2. The information signal processing apparatus according to claim 1, wherein the adding means adds character information on the 21st line and / or the 284th line within the blanking period of the video signal.   2. The information signal processing apparatus according to claim 1, wherein when the special reproduction is a pause, the control code is a non-output code.   2. The information signal processing apparatus according to claim 1, wherein when two control codes appear successively in the character information, the second control code is not sent.   2. The information signal processing apparatus according to claim 1, wherein when the special reproduction is random access, the adding means adds a control code for deleting character information stored in the buffer. Extracting means for extracting character information from an information signal including at least a video signal and character information;
Adding means for adding the character information to the video signal;
Control means for controlling the additional means, and rewriting the character code of the character information into a control code at the time of special reproduction,
Above for special playback is random access, the information signal processing apparatus characterized by adding the control code appears in the character information character information into a video signal. Extracting character information from an information signal including at least a video signal and character information;
Adding the character information to the video signal;
A step of rewriting the character information into a control code during special playback,
If the special playback is forward slow, in the addition step, after adding the character information corresponding to one field video signal in sending repeat the same field of the video only the first time, to the field to be repeated And a non-output code is added to the information signal processing method. 8. The information signal processing method according to claim 7 , wherein character information is added to the 21st line and / or the 284th line within the blanking period of the video signal. 8. The information signal processing method according to claim 7 , wherein when the special reproduction is a pause, the control code is a non-output code. 8. The information signal processing method according to claim 7, wherein when two control codes appear successively in the character information, the second control code is not sent. 8. The information signal processing method according to claim 7 , wherein, when the special reproduction is random access, the adding means adds a control code for erasing character information stored in the buffer. Extracting character information from an information signal including at least a video signal and character information;
Adding the character information to the video signal;
A step of rewriting the character information into a control code during special playback,
Above for special playback is random access, the information signal processing method characterized by adding character information on the video signal from the control code to the text information appears.

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