JP4144413B2 - Recording apparatus and recording method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording apparatus and a recording method for digitally encoding a television signal and recording it on a recording medium such as a DVD.
[0002]
[Prior art]
As a device for recording television broadcasts and recorded images, a DVD recorder using a recordable DVD as a medium instead of a video tape recorder is becoming popular. The recordable DVD is a recordable optical disc having a diameter of 12 cm and a thickness of 1.2 mm and having a capacity of 4.7 Gbytes on one side.
[0003]
The recordable DVD includes a write-once type (one-time recordable type) and a rewritable type (multiple-time rewritable type), DVD-R, DVD-RW, DVD + RW, DVD + R, and DVD-RAM. The following five types of formats have been proposed. These formats include “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 DVD Forum (for example, non-patent document). 2).
[0004]
In these DVD standards, the MPEG-2 system is adopted as a video and audio encoding system. The DVD recorder compresses and encodes the input video and audio signals using the MPEG-2 method to generate an MPEG-2 data stream, and performs a corresponding authoring process on the generated MPEG-2 data stream. Recording is performed on the DVD.
[0005]
Also, the DVD recorder is provided with a digital input terminal such as an IEEE 1394 terminal, and can transfer and record a moving image shot by a digital recording type camera-integrated video tape recorder (hereinafter referred to as a DV camcorder). Yes.
[0006]
[Non-Patent Document 1]
Internet <URL: http://www.dvdforum.gr.jp/>
[Non-Patent Document 2]
Internet <URL: http://www.dvdrw.com/>
[0007]
[Problems to be solved by the invention]
By the way, when a video signal recorded on a tape medium is reproduced, and the reproduced signal is transferred to a DVD for recording, the tape medium is a recording medium that is accessed sequentially, so the tape signal is just at the end of the video signal. It is difficult to perform so-called synchronized dubbing such as stopping playback and stopping DVD recording. For this reason, when a video signal reproduced from a tape medium is recorded in this way, content having no signal at the end is recorded on the DVD.
[0008]
The present invention has been made in view of the above circumstances. For example, when a digital video and / or audio signal reproduced from a tape medium is recorded on a disc-shaped recording medium, the content is not included in the end portion of the content. It is an object of the present invention to provide a recording apparatus and a recording method capable of recording without generating a signal portion.
[0009]
[Means for Solving the Problems]
The present invention relates to a recording apparatus for encoding video and / or audio data in a predetermined format and recording the encoded data on a first recording medium, wherein a video and / or audio data stream reproduced from the second recording medium is recorded. A digital input terminal that is input as a digital signal; a recording unit that encodes the data stream input from the digital input terminal in the predetermined format and records the data stream on the first recording medium; and the input from the digital input terminal. A time code information detecting means for detecting time code information of the second recording medium added to the data stream, and a control means for managing a data writing position and file management for the first recording medium. .
[0010]
The control means constantly monitors the time code information detected by the time code information detection means while the data stream input from the digital input terminal is being recorded on the first recording medium. In addition, the recording address of the first recording medium is monitored, and the timing at which the time code information changes from a value indicating a valid signal to a value indicating no signal is detected. When the recording address on the first recording medium is acquired and stored in the memory, and then recording is continued, and the time code is again a value meaning a valid signal, the value of the memory is set. Clear and detect again the timing when the time code information changes from a value meaning a valid signal to a value meaning no signal. In this case, the process of acquiring the recording address on the first recording medium and storing it in the memory is repeated, and when the recording ends without changing the time code information to a value meaning no signal, Based on the address stored in the memory, data reproduced after the address is erased.
[0011]
The present invention also provides video and / or audio data reproduced from a second recording medium in a recording method for encoding video and / or audio data in a predetermined format and recording the encoded data on the first recording medium. A digital input step in which the stream is input as a digital signal, a recording step in which the data stream input in the digital input step is encoded in the predetermined format and recorded on the first recording medium, and the digital input terminal A time code information detecting step for detecting time code information of the second recording medium added to the input data stream ; a control step for managing a data writing position and file on the first recording medium; comprising a, in the control step, the digital input The input data stream in step in the middle of performing a recording on the first recording medium, always with is monitoring the time code information detected by the time code information detection step, the first The recording address of the recording medium is monitored, and the timing at which the time code information changes from a value indicating a valid signal to a value indicating no signal is detected, and the timing on the first recording medium is detected at that timing. The recording address is acquired and stored in the memory. After that, when the recording is continued and the time code is a value indicating a valid signal again, the value of the memory is cleared and the time code is again displayed. The timing at which the information changes from a value indicating a valid signal to a value indicating no signal is detected, and the first recording medium is detected at that timing. If the recording is completed while the time code information remains in a state that means no signal, the address stored in the memory is set to the address stored in the memory. Based on this, data reproduced after the address is erased.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a DVD recorder to which the present invention is applied will be described as an embodiment of the present invention.
[0013]
FIG. 1 shows a block diagram of a DVD recorder 10 according to an embodiment of the present invention.
[0014]
The DVD recorder 10 according to the 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 the AV signal from the DVD disk. Device.
[0015]
The DVD recorder 10 has been proposed by the DVD-VIDEO, DVD-R, DVD-RW, and the DVD + RW Alliance, which is a private standard organization for DVDs, as proposed by the “DVD Forum”, which is a private standard organization for DVDs. It is a multi-type disc recorder capable of recording and reproducing with respect to DVD + R and DVD + RW. Hereinafter, these DVD discs that can be recorded and reproduced by the DVD recorder 10 are collectively referred to as a DVD disc 1.
[0016]
The internal configuration of the DVD recorder 10 will be described with reference to FIG.
[0017]
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.
[0018]
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. A video signal, which is a video signal of a predetermined video format such as NTSC or PAL, is input from these devices 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 to the apparatus. The video output terminal (Vout) is connected to a television monitor, a video signal recording device, or 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 to the outside of the apparatus.
[0019]
The audio input terminal (Ain) is connected to a tuner, a set top box, an audio signal reproduction device, and the like via an audio cable. For example, an audio signal which is a sound music signal of a predetermined format is input to the audio input terminal (Ain) 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 to the apparatus. The audio output terminal (Aout) is connected to an audio device, an audio signal recording device, or the like via an audio cable. The audio output terminal (Aout) outputs, for example, an audio signal which is a sound music signal of 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 apparatus.
[0020]
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, for example, an IEEE1394 terminal or an interface cable for digital data transmission such as USB. AV data (DV data) in DV format reproduced by the DV player from the DV tape cassette is input to the digital interface terminal (DVin).
[0021]
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.
[0022]
The NTSC / PAL decoder 15 receives a video signal such as NTSC or PAL format input from the video input terminal (Vin) and digitized by the video A / D converter 11 as an ITU-R BT. The video signal is converted to a 601 format video signal.
[0023]
The DV decoder 16 converts DV data input from the digital interface terminal (DVin) into ITU-R BT. A video signal of 601 format and an audio signal of a predetermined format are converted.
[0024]
MPEG encoder 17 is an ITU-R BT. A video signal of 601 format and an audio signal of a predetermined format digitized by the audio A / D converter 13 are input, these are compressed and encoded by the MPEG-2 system, and the MPEG-2 system AV data stream (MPEG -2 stream).
[0025]
The MPEG decoder 18 receives an MPEG-2 stream, decompresses and decodes the stream, and outputs an ITU-R BT. A video signal of 601 format and an audio signal of a predetermined format are generated.
[0026]
The graphic synthesis circuit 19 is an ITU-R BT. Processing for synthesizing an externally input on-screen display image (OSD image) is performed on the display screen of the 601 format video signal.
[0027]
The NTSC / PAL encoder 20 is an ITU-R BT. A 601 format video signal is converted into an NTSC or PAL format video signal and output from a video output terminal (Vout).
[0028]
The DVD recorder 10 also includes a switching circuit 21 that switches the transmission path of the video signal and the audio signal.
[0029]
The switching circuit 21 switches the transmission path between recording and reproduction, and further switches the transmission path between DV data and other signals during recording.
[0030]
Specifically, the switching circuit 21 switches the path as follows. In other words, when recording a signal other than 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 synthesis circuit 19, and 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 DV data, the switching circuit 21 supplies the video signal output from the DV decoder 16 to the MPEG encoder 17 and the graphic synthesis circuit 19, and the audio signal output from the DV decoder 16 is converted to the MPEG encoder. 17 and the audio D / A converter 14 so that the transmission path is switched. For reproduction, the switching circuit 21 supplies the video signal output from the MPEG decoder 18 to the graphic synthesis circuit 19 and supplies the audio signal output from the MPEG decoder 18 to the audio D / A converter 14. The transmission path is switched as follows.
[0031]
Further, the DVD recorder 10 includes a buffer circuit 22 and a drive device 23.
[0032]
The buffer circuit 22 is a memory that temporarily stores an MPEG-2 stream and a control data stream that are recorded on and reproduced from the DVD disk 1. The drive device 23 is a device on which the DVD disk 1 is loaded and which physically accesses the loaded DVD disk 1 to record and reproduce data. The control data stream is a data stream including information information defined in the format of the DVD disc 1.
[0033]
The DVD recorder 10 also includes a VBI slice circuit 24.
[0034]
The VBI slice circuit 24 is a circuit that detects information information (VBI information) included in the blanking period of the video signal from the video signal input from the video input terminal (Vin).
[0035]
Further, the DVD recorder 10 includes an input device 25 and a system controller 26.
[0036]
The input device 25 is an input device such as an infrared remote controller, for example, and is a device on which information input for operating the DVD recorder 10 is performed by a user. Information input from the input device 25 is supplied to the system controller 26.
[0037]
The system controller 26 is a control block including a microcomputer that performs setting and control for each circuit described above.
[0038]
Specific processing performed by the system controller 26 includes, for example, the following.
[0039]
For example, the system controller 26 reads the control data stream from the buffer circuit 22 and performs access control, display control, and the like for the DVD disk 1 based on the control data. The system controller 26 records or generates control information related to the recorded data at the start or end of data recording, and records the control information on the DVD disk 1 as a data stream according to the format. The system controller 26 generates header information of the MPEG-2 stream and analyzes the header information.
[0040]
Further, the system controller 26 generates an OSD image such as a menu screen, for example, supplies the generated OSD image to the graphic synthesis circuit 19 and displays the OSD image on the 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 the 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 input information currently input.
[0041]
Further, the system controller 26 is supplied with 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 playback, the system controller 26 generates VBI information based on necessary information among the information detected from the header information of the MPEG-2 stream, supplies the generated VBI information to the NTSC / PAL encoder 20 and outputs it. The video signal to be encoded is encoded at a predetermined blanking position.
[0042]
The recording operation of the DVD recorder 10 having the above configuration is as follows.
[0043]
At the time of recording, a video signal and an audio signal are input to the DVD recorder 10 from the outside. The input video signal is transmitted to the ITU-R BT.1 by the NTSC / PAL decoder 15 or the DV decoder 16. It is converted into a video signal of 601 format. ITU-R BT. The 601 format video signal is supplied to the MPEG encoder 17 via the switching circuit 21, and is encoded into an MPEG-2 stream together with the audio signal. 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. 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 disk 1, and records the read data on the DVD disk 1.
[0044]
Further, the DVD recorder 10 also performs the following operation so that the user can monitor the video and audio being recorded in real time.
[0045]
The NTSC / PAL decoder 15 or DV decoder 16 performs ITU-R BT. The video signal converted into the 601 format is also supplied to the graphic synthesis circuit 19 via the switching circuit 21. The video signal supplied to the graphic synthesis circuit 19 is synthesized with the OSD image when the OSD image is output by the system controller 26, and is supplied to the NTSC / PAL encoder 20 as it is when the OSD image is not output. Is done. 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.
[0046]
The operation of the DVD recorder 10 during playback is as follows.
[0047]
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 sent to the ITU-R BT. It is decoded into a video signal and an audio signal in the 601 format. The decoded audio signal is converted to an analog signal via the switching circuit 21 and then output to the outside. The decrypted ITU-R BT. The 601 format video signal is supplied to the graphic synthesis circuit 19 via the switching circuit 21. The video signal supplied to the graphic synthesis circuit 19 is synthesized with the OSD image when the OSD image is output by the system controller 26, and is supplied to the NTSC / PAL encoder 20 as it is when the OSD image is not output. Is done. 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 then output to the outside. Further, the system controller 26 performs, for example, control of the reading position of the disk and various display controls according to the read control data stream.
[0048]
Next, for example, processing when digital AV data reproduced from a DV tape cassette mounted on a camcorder or the like is recorded on the DVD disk 1 will be described with reference to FIG.
[0049]
The camcorder and the DVD recorder 10 are connected with an interface cable such as IEEE1394 via a digital interface terminal (DVin). The camcorder outputs digital AV data reproduced from the DV tape 30. AV data reproduced from the DV tape 30 is converted from the data stream of the tape format by the DV decoder 16 from the ITU-R BT. It is converted into a video signal of 601 format. Subsequently, ITU-R BT. The 601 format video signal is converted into an MPEG-2 data stream by the MPEG encoder 17 and recorded on the DVD disk 1 by the drive device 23.
[0050]
Here, in a tape media format capable of digitally recording an audio signal or a video signal, information called a time code is usually recorded, for example, for each track. The time code is a time reference of recorded data and is widely used for editing and the like.
[0051]
In such a time code, a value that increases in time as the tape travels is recorded in a tape portion where valid AV data is recorded. On the other hand, a specific value (for example, 0) is recorded in the non-signal tape portion where AV data is not yet recorded.
[0052]
When digital AV data reproduced from a DV tape is transferred by a digital interface, a time code synchronized with the reproduction position of the tape is usually transferred. Therefore, this time code is also transferred to the DVD recorder 10.
[0053]
As shown in FIG. 2, in the DVD recorder 10, the DV decoder 16 detects the time code from the digital AV data transferred from the DV tape. The detected time code is transferred to the system controller 26.
[0054]
The system controller 26 constantly monitors the detected time code while the digital AV data reproduced from the DV tape is being recorded on the DVD disk 1. The system controller 26 also monitors the current recording address on the disc.
[0055]
The system controller 26 detects the timing at which the time code value changes from a normal value in which a valid signal is recorded to a specific value (for example, 0) that means no signal, and the DVD at that timing. A recording position (recording address) on the disk is acquired, and a recording position (recording address) on the DVD disk at that timing is acquired and stored in the internal memory 31.
[0056]
Thereafter, recording is continued, and when the time code becomes a valid value again, the value in the internal memory 31 is cleared, and the process of detecting the timing at which the value has changed to a specific value is repeated.
[0057]
On the other hand, when the recording is finished in a state where the time code is a specific value (for example, 0), the system controller 26 is based on the address stored in the internal memory 31 and the data reproduced after that address. Is deleted.
[0058]
For example, when data is recorded in a DVD-VIDEO compatible format, data constituting a title that is played back without interruption must be recorded at physically consecutive addresses. Therefore, if data of a physical address after a predetermined address (except for management information) is deleted, data reproduced after that address, that is, the non-signal part of the last part of the content is deleted. Is possible. Further, when data is recorded in a DVD-RAM compatible format, it can be determined based on the management information where the content data after a specific address is recorded, so it is also reproduced after that address. Data can be deleted, and the no-signal portion at the end of the content can be deleted.
[0059]
It is possible to save the address on the disk and delete the end, but the system controller 26 saves the value immediately before the timing value changes to mean no signal and the difference from the start time. It is also possible to calculate the length that should be left in and delete the end based on that information.
[0060]
【The invention's effect】
In the disk recording apparatus according to the present invention, the time code information of the tape medium is detected while the data stream reproduced from the tape medium is being recorded, and the detected time code information is set to a value meaning no signal. The recording address of data at the changed change timing is stored. When the time code information does not become a valid value after the change timing after the end of recording, data reproduced after the stored address is erased.
[0061]
For this reason, in the disc recording apparatus according to the present invention, when recording a digital video and / or audio signal reproduced from a tape medium on a disc-shaped recording medium, the recording is performed without causing a no-signal portion at the end portion of the content. Can do.
[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 explaining time code detection processing;
[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 (2)

In a recording apparatus for encoding video and / or audio data in a predetermined format and recording the encoded data on a first recording medium,
A digital input terminal to which a video and / or audio data stream reproduced from the second recording medium is input as a digital signal;
Recording means for encoding the data stream input from the digital input terminal in the predetermined format and recording the encoded data stream on the first recording medium;
Time code information detecting means for detecting time code information of the second recording medium added to the data stream input from the digital input terminal;
A control unit for performing data management and file management on the first recording medium,
The control means constantly monitors the time code information detected by the time code information detection means while the data stream input from the digital input terminal is being recorded on the first recording medium. In addition, the recording address of the first recording medium is monitored, and the timing at which the time code information changes from a value indicating a valid signal to a value indicating no signal is detected. When the recording address on the first recording medium is acquired and stored in the memory, and then recording is continued, and the time code is again a value meaning a valid signal, the value of the memory is set. Clear and detect again the timing when the time code information changes from a value meaning a valid signal to a value meaning no signal. In this case, the process of acquiring the recording address on the first recording medium and storing it in the memory is repeated, and when the recording ends without changing the time code information to a value meaning no signal, A recording apparatus for erasing data reproduced after the address based on the address stored in the memory . In a recording method in which video and / or audio data is encoded in a predetermined format and recorded on a first recording medium,
A digital input step in which the video and / or audio data stream reproduced from the second recording medium is input as a digital signal;
A recording step of encoding the data stream input in the digital input step in the predetermined format and recording the encoded data stream on the first recording medium;
A time code information detecting step for detecting time code information of the second recording medium added to the data stream input from the digital input terminal;
A control step of performing data management and file management on the first recording medium,
In the control step , the time code information detected in the time code information detection step is constantly monitored while the data stream input in the digital input step is being recorded on the first recording medium. In addition, the recording address of the first recording medium is monitored, and the timing at which the time code information changes from a value indicating a valid signal to a value indicating no signal is detected. When the recording address on the first recording medium is acquired and stored in the memory, and then recording is continued, and the time code is again a value meaning a valid signal, the value of the memory is set. Clear and detect the timing when the time code information changes again from a value that signifies a valid signal to a value that signifies no signal When the recording of the first recording medium at that timing is repeated and the process of storing in the memory is repeated, and the time code information remains in the state of a value meaning no signal, A recording method for erasing data reproduced after the address based on the address stored in the memory .

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