JP2004320082A - Video signal recording apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video signal recording apparatus and method whereby a receiver side can correctly display VBI even on the occurrence of an operation of REC PAUSE or channel switching. <P>SOLUTION: A DVD recorder includes: a VBI slice circuit 24; an MPEG encoder 17; and a system controller 26. The system controller 26 first inserts a control command for deleting information in a VBI memory at the receiver side to an MPEG2 data stream when the REC PAUSE is released. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video signal recording apparatus and method for inputting a predetermined television signal such as NTSC, digitally encoding the input television signal and recording the digitally encoded television signal on a recording medium such as a DVD.
[0002]
[Prior art]
As a device for recording television broadcasts and recording captured images, DVD recorders using recordable DVDs as media instead of video tape recorders have begun to spread. The recordable DVD is a recordable optical disc having a diameter of 12 cm and a thickness of 1.2 mm and a capacity of 4.7 Gbytes on one side.
[0003]
There are five types of recordable DVDs, DVD-R, DVD-RW, DVD + RW, DVD + R, and DVD-RAM, including both write-once (one-time recordable type) and rewritable (multiple-time rewritable types). The format has been proposed. These formats are described in "DVD Forum" which is a private standard organization of DVD (for example, see Non-Patent Document 1), and "DVD + RW Alliance" which is a private standard organization different from the DVD Forum (for example, see Non-Patent Document 2). Ref.).
[0004]
In these DVD standards, the MPEG-2 system is adopted as a video and audio coding system. In the DVD recorder, the input video and audio signals are compression-encoded by the MPEG-2 system to generate an MPEG-2 data stream, and the generated MPEG-2 data stream is further subjected to an authoring process. Recording is performed on a DVD.
[0005]
Further, in the television signal broadcasting method, additional information such as closed caption and text information and their control data is added to a predetermined horizontal scanning period (for example, the 21st horizontal line) within the vertical blanking period. There is a method called teletext or teletext, such as insertion. Such information inserted in a predetermined horizontal scanning period within the vertical blanking period is generally called VBI (Vertical Blanking Information) information. When text information or closed caption is transmitted as VBI information on the receiving side, the information is stored in a dedicated display memory, and the information stored in the display memory is displayed on the OSD. In a system such as teletext or teletext, for example, VBI information is transmitted over a continuous frame, and a total of a plurality of frames makes sense as VBI information.
[0006]
When recording a television signal including such VBI information, a DVD recorder detects such VBI information at the stage of an NTSC or PAL television signal, and converts the detected VBI information to MPEG-2 data. Encode in the header of each GOP of the stream.
[0007]
In addition, a general video or audio recording apparatus is provided with a function called “rec pause” for temporarily stopping a recording operation, in addition to a stop process for stopping a recording operation.
[0008]
For example, when recording is started again after the stop processing, a new MPEG-2 data stream is recorded on the recording medium after one MPEG-2 data stream is completely completed. You. On the other hand, when recording is resumed after the rec pause, one continuous MPEG-2 data stream is recorded on the recording medium before and after the rec pause.
[0009]
[Non-patent document 1]
Internet <URL: http: // www. dvdforum. gr. jp / ＞
[Non-patent document 2]
Internet <URL: http: // www. dvdrw. com / >>
[0010]
[Problems to be solved by the invention]
By the way, when the rec pause operation is performed by the DVD recorder, the recording of the VBI information is naturally stopped, and the continuity of the VBI information is interrupted before and after the recording.
[0011]
Therefore, for example, if some text information is displayed before the rec pause, the text information may remain in the memory on the receiving side, and may not be erased but may be displayed on the video after recording is resumed. There is.
[0012]
Also, at the time of channel switching, the continuity of the VBI information is interrupted similarly to the rec pause, and the text information of the previous channel may be displayed on the video after the channel switching.
[0013]
The present invention has been made in view of the above circumstances, and receives additional information inserted in a predetermined horizontal scanning period within a vertical blanking period even when a rec pause occurs. It is an object of the present invention to provide a video signal recording device and a video signal recording method capable of correctly displaying the video signal on the side.
[0014]
[Means for Solving the Problems]
A video signal recording device according to the present invention is provided with a television signal of a predetermined format, a television decoding unit for converting the input television signal into a predetermined digital video signal, and encoding the digital video signal. A video encoding unit that converts the video data stream into a video data stream of a predetermined format; a recording unit that records the video data stream on a recording medium; and a predetermined horizontal scanning period within a vertical blanking period of each frame of the television signal. Blanking information detecting means for detecting the included blanking data, and control means for encoding the detected blanking data to the video data stream, wherein the control means temporarily performs an encoding process. At the start of re-encoding after a stop or at the beginning of re-encoding after a channel switch, Characterized by inserting a control command for erasing the information in the memory for storing the data as blanking data.
[0015]
A video signal recording method according to the present invention includes the steps of: inputting a television signal of a predetermined format, converting the input television signal into a predetermined digital video signal, encoding the digital video signal, and encoding video data of a predetermined format. Stream, and detects blanking data included in a predetermined horizontal scanning period within a vertical blanking period of each frame of the input television signal, and converts the detected blanking data to the video data stream. The video data stream is recorded on a recording medium, and display data is stored at the start of re-encoding after a pause of the encoding process or at the start of re-encoding after a channel switch. Insert a control command to erase the information in the memory into the video data stream as blanking data That.
[0016]
In the video signal recording apparatus and method according to the present invention described above, at the time of starting re-encoding after the encoding process is temporarily stopped or at the time of starting re-encoding after switching the channel, the information in the memory for storing the display data is stored. The control command to be erased is inserted into the video data stream as blanking data.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a DVD recorder to which the present invention is applied will be described as an embodiment of the present invention.
[0018]
FIG. 1 shows a block diagram of a DVD recorder 10 according to an embodiment of the present invention.
[0019]
A DVD recorder 10 according to an embodiment of the present invention records an AV signal (video / audio signal) reproduced from a television broadcast or a recording tape on a DVD disk, and reproduces and outputs an AV signal from the DVD disk. Device.
[0020]
In the DVD recorder 10, DVD-VIDEO, DVD-R, DVD-RW proposed by "DVD Forum" which is a private standard organization of DVD, and DVD + R proposed by "DVD + RW Alliance" which is a private standard organization of DVD. And a multi-type disc recorder capable of recording and reproducing to and from DVD + RW. Hereinafter, these DVD disks that can be recorded and reproduced by the DVD recorder 10 are collectively referred to as a DVD disk 1.
[0021]
The internal configuration of the DVD recorder 10 will be described with reference to FIG.
[0022]
The DVD recorder 10 includes a video input terminal (Vin), an audio input terminal (Ain), a video output terminal (Vout), an audio output terminal (Aout), a digital interface terminal (DVin), and a video A / D converter. 11, a video D / A converter 12, an audio A / D converter 13, and an audio D / A converter 14.
[0023]
The video input terminal (Vin) is connected to a tuner, a set-top box, a video signal reproducing device, and the like via a video cable. From these devices, a video signal which is a video signal of a predetermined video format such as NTSC or PAL is input to the video input terminal (Vin). The video signal input to the video input terminal (Vin) is converted from an analog signal to a digital signal by the video A / D converter 11 and input into the device. The video output terminal (Vout) is connected to a television monitor, a video signal recording device, and the like via a video cable. The video output terminal (Vout) outputs a video signal which is a video signal of a predetermined video format such as NTSC or PAL to these devices. The video signal output from the video output terminal (Vout) is converted from a digital signal to an analog signal by the video D / A converter 12 and output outside the device.
[0024]
The audio input terminal (Ain) is connected to a tuner, a set-top box, an audio signal reproducing device, and the like via an audio cable. The audio input terminal (Ain) receives, for example, an audio signal, which is an audio / music signal in a predetermined format, from these devices. The audio signal input to the audio input terminal (Ain) is converted from an analog signal to a digital signal by the audio A / D converter 13 and input into the device. The audio output terminal (Aout) is connected to an audio device, an audio signal recording device, and the like via an audio cable. The audio output terminal (Aout) outputs an audio signal that is, for example, an audio music signal in a predetermined format to these devices. The audio signal output from the audio output terminal (Vout) is converted from a digital signal to an analog signal by the audio D / A converter 14 and output outside the device.
[0025]
The digital interface terminal (DVin) is connected to a DV player that reproduces AV data (video data and audio data) from a DV tape cassette via an IEEE1394 terminal or an interface cable for digital data transmission such as USB. AV data (DV data) in DV format reproduced by a DV player from a DV tape cassette is input to a digital interface terminal (DVin).
[0026]
The DVD recorder 10 includes an NTSC / PAL decoder 15, a DV decoder 16, an MPEG encoder 17, an MPEG decoder 18, a graphic synthesis circuit 19, and an NTSC / PAL encoder 20.
[0027]
The NTSC / PAL decoder 15 converts a video signal of NTSC or PAL format or the like input from the video input terminal (Vin) and digitized by the video A / D converter 11 into an ITU-R BT. 601 format video signal.
[0028]
The DV decoder 16 converts the DV data input from the digital interface terminal (DVin) into ITU-R BT. 601 format video signals and a predetermined format audio signal.
[0029]
MPEG encoder 17 is based on ITU-R BT. A video signal of a 601 format and an audio signal of a predetermined format digitized by the audio A / D converter 13 are input, and they are compression-encoded by the MPEG-2 system and are subjected to an MPEG-2 AV data stream (MPEG). -2 stream).
[0030]
The MPEG decoder 18 receives the MPEG-2 stream, decompresses and decodes the stream, and generates an ITU-R BT. A 601 format video signal and a predetermined format audio signal are generated.
[0031]
The graphic synthesizing circuit 19 is based on ITU-R BT. A process of synthesizing an externally input on-screen display image (OSD image) on a display screen of a 601 format video signal is performed.
[0032]
The NTSC / PAL encoder 20 outputs the ITU-R BT. 601 format video signals are converted to NTSC or PAL format video signals and output from a video output terminal (Vout).
[0033]
In addition, the DVD recorder 10 includes a switching circuit 21 that switches a transmission path of a video signal and an audio signal.
[0034]
The switching circuit 21 switches the transmission path between recording and reproduction, and switches the transmission path between DV data and other signals during recording.
[0035]
Specifically, the switching circuit 21 switches paths as follows. That is, when recording a signal other than the DV data, the switching circuit 21 supplies the video signal output from the NTSC / PAL decoder 15 to the MPEG encoder 17 and the graphic synthesizing circuit 19, and outputs the video signal from the audio A / D converter 13. The transmission path is switched so that the output audio signal is supplied to the MPEG encoder 17 and the audio D / A converter 14. When recording the DV data, the switching circuit 21 supplies the video signal output from the DV decoder 16 to the MPEG encoder 17 and the graphic synthesizing circuit 19, and converts the audio signal output from the DV decoder 16 into the MPEG encoder The transmission path is switched so as to supply the signal to the D / A converter 17 and the audio D / A converter 14. When reproducing, the switching circuit 21 supplies the video signal output from the MPEG decoder 18 to the graphic synthesizing circuit 19 and supplies the audio signal output from the MPEG decoder 18 to the audio D / A converter 14. Switch the transmission path so that
[0036]
The DVD recorder 10 includes a buffer circuit 22 and a drive device 23.
[0037]
The buffer circuit 22 is a memory for temporarily storing an MPEG-2 stream and a control data stream that are recorded and reproduced on and from the DVD disk 1.
The drive device 23 is a device on which the DVD disk 1 is mounted and which physically accesses the mounted DVD disk 1 to record and reproduce data. Note that the control data stream is a data stream including information information specified in the format of the DVD disc 1 and the like.
[0038]
The DVD recorder 10 includes a VBI slice circuit 24.
[0039]
The VBI slice circuit 24 is a circuit that detects information information (VBI information) included in a blanking period of a video signal from a video signal input from a video input terminal (Vin).
[0040]
The DVD recorder 10 includes an input device 25 and a system controller 26.
[0041]
The input device 25 is, for example, an input device such as an infrared remote controller, and is a device for inputting information for operating the DVD recorder 10 by a user. The information input from the input device 25 is supplied to the system controller 26.
[0042]
The system controller 26 is a control block including a microcomputer or the like that performs setting and control for each circuit described above.
[0043]
Specific processing performed by the system controller 26 includes, for example, the following.
[0044]
For example, the system controller 26 reads a control data stream from the buffer circuit 22 and performs access control, display control, and the like on the DVD disk 1 based on the control data. The system controller 26 records or generates control information on the recorded data at the start or end of data recording, and records the control information on the DVD disc 1 as a data stream according to a format. The system controller 26 generates header information of the MPEG-2 stream and analyzes the header information.
[0045]
Further, the system controller 26 generates an OSD image such as a menu screen, supplies the generated OSD image to the graphic synthesizing circuit 19, and displays the OSD image on a television monitor. Further, the system controller 26 appropriately updates the OSD image according to the input information from the input device 25, and displays the changed OSD image on a television monitor. The system controller 26 performs various controls according to the input from the input device 25, and performs predetermined control determined based on the currently displayed OSD image and the currently input information.
[0046]
Also, the system controller 26 supplies the VBI information detected from the input video signal from the VBI slice circuit 24 and supplies necessary information to the MPEG encoder 17 among a plurality of pieces of information indicated in the VBI information. Then, the header information of the MPEG-2 stream is encoded. During reproduction, the system controller 26 generates VBI information based on necessary information among information detected from the header information of the MPEG-2 stream, supplies the generated VBI information to the NTSC / PAL encoder 20, and outputs the VBI information. The video signal is encoded at a predetermined blanking position.
[0047]
The recording operation of the DVD recorder 10 having the above configuration is as follows.
[0048]
During recording, a video signal and an audio signal are externally input to the DVD recorder 10. The input video signal is supplied to the ITU-R BT. 601 format video signal. ITU-R BT. The video signal of the 601 format is supplied to the MPEG encoder 17 via the switching circuit 21, and is encoded together with the audio signal into an MPEG-2 stream. The buffer circuit 22 temporarily stores the MPEG-2 stream encoded by the MPEG encoder 17 and also temporarily stores the control data stream generated by the system controller 26. Then, in the DVD recorder 10, the drive device 23 reads the MPEG-2 stream and the control data stream from the buffer circuit 22 in the order according to the format of the DVD disc 1, and records the read data on the DVD disc 1.
[0049]
Further, the DVD recorder 10 also performs the following operation so that the user can perform EE monitoring of the video and audio being recorded in real time.
[0050]
The NTSC / PAL decoder 15 or the DV decoder 16 uses the ITU-R BT. The video signal converted into the 601 format is also supplied to the graphic synthesizing circuit 19 via the switching circuit 21. The video signal supplied to the graphic composition circuit 19 is combined with the OSD image by the system controller 26 when the OSD image is output, and is supplied to the NTSC / PAL encoder 20 when the OSD image is not output. Is done. The ITU-R BT. Supplied to the NTSC / PAL encoder 20. The 601 format video signal is converted to an NTSC or PAL format video signal, converted to an analog signal, and output to the outside. The input audio signal is converted to an analog signal via the switching circuit 21 and then output to the outside.
[0051]
The operation of the DVD recorder 10 during reproduction is as follows.
[0052]
At the time of reproduction, the drive device 23 reads the MPEG-2 stream and the control data stream from the DVD disk 1 and stores them in the buffer circuit 22. The MPEG-2 stream stored in the buffer circuit 22 is read by the MPEG decoder 18, and the control data stream is read by the system controller 26. The read MPEG-2 stream is processed by the MPEG decoder 18 according to ITU-R BT. It is decoded into a 601 format video signal and audio signal. The decoded audio signal is converted to an analog signal via the switching circuit 21 and output to the outside. The decoded ITU-R BT. The 601 format video signal is supplied to the graphic synthesizing circuit 19 via the switching circuit 21. The video signal supplied to the graphic composition circuit 19 is combined with the OSD image by the system controller 26 when the OSD image is output, and is supplied to the NTSC / PAL encoder 20 when the OSD image is not output. Is done. The ITU-R BT. Supplied to the NTSC / PAL encoder 20. A 601 format video signal is converted to an NTSC or PAL format video signal, converted to an analog signal, and output to the outside. In addition, the system controller 26 performs, for example, control of the read position of the disk, various display controls, and the like in accordance with the read control data stream.
[0053]
Next, encoding processing of VBI information for an MPEG-2 stream at the time of rec pause will be described.
[0054]
First, the encoding operation of VBI information at the time of recording a television signal in a steady state is as shown in FIG. That is, the VBI slice circuit 24 detects VBI information for each frame (for each vertical synchronization timing (V timing)). The VBI slice circuit 24 transfers the detected VBI information to the system controller 26 for each frame. The system controller 26 stores the input VBI information in the internal buffer for one GOP. When the system controller 26 stores the VBI information for one GOP in the internal buffer, the system controller 26 transfers the VBI information for one GOP to the MPEG encoder 17 collectively. The MPEG encoder 17 describes VBI information input in GOP units in GOP header information. Then, the MPEG-2 data stream into which the VBI information is inserted is recorded on a DVD disc.
[0055]
On the other hand, at the time of rec pause, as shown in FIG. 3, the VBI slice circuit 24 detects VBI information for each frame (every vertical synchronization timing (V timing)), and writes the VBI information to an internal buffer of the system controller 26. However, the data is not transferred to the MPEG encoder 17.
[0056]
Then, when the rec pause is released and recording is resumed, the system controller 26 first transfers a predetermined control command for erasing information in the VBI display memory on the receiving side to the MPEG encoder 17 as shown in FIG. I do. The VBI display memory on the receiving side is a memory that stores text information detected by the receiving device when the text information is displayed on the screen by OSD.
[0057]
Here, there is a standard for text broadcasting in the United States in which subtitle data is inserted into the 21st horizontal line. In this standard, text data for two channels (channel 1 and channel 2) can be transferred between the bottom field and the top field. Further, one channel uses two VBI display memories, and the VBI display memory to be used can be appropriately switched according to the situation. That is, two patterns of text contents to be displayed in one channel can be used.
[0058]
For this reason, for example, when inserting the VBI information into the 21st horizontal line which is the teletext standard in the United States, the system controller 26 uses the following control command as a control command for deleting information in the VBI display memory on the receiving side. Transfer four control commands.
A command to erase information in the display memory of channel 1 A command to erase information in the non-display memory of channel 1 A command to erase information in the display memory of channel 2 Information in the non-display memory of channel 2 Command to delete
Furthermore, since the insertion of new VBI information is started after the rec pause is released, the system controller 26 transfers a control command to the MPEG encoder 17 for notifying the receiving side that new VBI information will be inserted.
[0060]
For example, when inserting VBI information into the 21st horizontal line, which is a teletext standard in the United States, the following two control commands are used as control commands to notify the receiving side that new VBI information will be inserted. Forward.
A command to restart the text of channel 1 A command to restart the text of channel 2
Then, after transferring the above control commands to the MPEG encoder 17 after the release of the rec pause, the system controller 26 performs the encoding operation of the VBI information at the time of recording the regular television signal as shown in FIG. Do.
[0062]
As described above, in the DVD recorder 10 according to the embodiment of the present invention, when a rec pause occurs and then the rec pause is released, first, a control command for erasing information stored in the VBI display memory on the receiving side. Into an MPEG-2 stream. Therefore, even if a rec pause occurs and the continuity of the VBI information is interrupted, the VBI information can be correctly displayed on the receiving side.
[0063]
In the DVD recorder 10 according to the embodiment of the present invention, a process of encoding a control command for erasing information stored in the VBI display memory on the receiving side into an MPEG-2 stream is performed by a code after channel switching. It is also performed at the start of the conversion. Specifically, the DVD recorder 10 inserts the four commands described above and two start commands following the four commands. For this reason, in the DVD recorder 10, even if the channel switching occurs and the continuity of the VBI information is interrupted, the VBI information can be correctly displayed on the receiving side.
[0064]
【The invention's effect】
In the video signal recording apparatus and method according to the present invention, at the time of starting re-encoding after the encoding process is temporarily stopped or at the time of starting re-encoding after switching the channel, the information in the memory for storing the display data is erased. The control command is inserted into the video data stream as blanking data.
[0065]
Therefore, in the video signal recording device and method according to the present invention, even when a rec pause occurs, the additional information inserted in a predetermined horizontal scanning period in the vertical blanking period is correctly displayed on the receiving side. Can be done.
[Brief description of the drawings]
FIG. 1 is a block diagram of a DVD recorder according to an embodiment of the present invention.
FIG. 2 is a diagram for describing an encoding operation of VBI information during stationary recording.
FIG. 3 is a diagram for explaining an encoding operation of VBI information during rec pause.
FIG. 4 is a diagram for explaining an encoding operation of VBI information at the time of rec-pause cancellation.
[Explanation of symbols]
1 DVD disk, 10 DVD recorder, 15 NTSC / PAL decoder, 16 DV decoder, 17 MPEG encoder, 18 MPEG decoder, 19 graphic synthesis circuit, 20 NTSC / PAL encoder, 21 switching circuit, 22 buffer circuit, 23 drive circuit, 24 VBI slice circuit, 25 input device, 26 system controller

Claims (4)

A television signal of a predetermined format is inputted, a television decoding means for converting the inputted television signal into a predetermined digital video signal, and encoding the digital video signal and converting it into a video data stream of a predetermined format. Video encoding means,
Recording means for recording the video data stream on a recording medium,
Blanking information detecting means for detecting blanking data included in a predetermined horizontal scanning period within a vertical blanking period of each frame of the television signal, and converting the detected blanking data to the video data stream. Control means for encoding the
The control means sets a control command for erasing information in a memory for storing display data as blanking data at the time of starting re-encoding after temporarily stopping the encoding process or at the time of starting re-encoding after switching channels. A video signal recording device characterized by being inserted. 2. The control means according to claim 1, wherein said control means inserts, as a blanking data, control data for notifying that the insertion of display data has been started after inserting a control command for erasing information in the memory. Video signal recording device. Input a television signal of a predetermined system,
Convert the input television signal to a predetermined digital video signal,
Encoding the digital video signal and converting it into a video data stream of a predetermined format,
Detect blanking data included in a predetermined horizontal scanning period within a vertical blanking period of each frame of the input television signal,
Encoding the detected blanking data into the video data stream;
Recording the video data stream on a recording medium,
Further, at the start of the re-encoding after the pause of the encoding process or at the start of the re-encoding after the channel switching, the control command for erasing the information in the memory for storing the display data is used as the blanking data as the video data. A video signal recording method characterized by being inserted into a stream. 4. The video signal recording method according to claim 3, wherein after inserting a control command for erasing information in the memory, control data for notifying that the insertion of the display data has been started is inserted as blanking data.

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