JP2006024338A - Recording and reproducing system, and dubbing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide one disk by duplicating a video signal recorded in a video tape in a DVD without exceeding capacity of one sheet of DVD or without leaving a surplus, in equipment combining a VTR and a DVD. <P>SOLUTION: A VCR means 10 reproduces a video voice signal recorded in a magnetic tape T, a digital video recording means 20 encodes the video voice signal reproduced by this VCR means 10 and records it in an optical disk D. The VCR means 10 is provided with a total video recording time calculating means 12a calculating a total video recording time of the magnetic tape housed in a video cassette. The digital video recording means is provided with an optimum recording rate calculating means 28a calculating an optimum recording rate from the total video recording time in order that the video and voice signal recorded in the magnetic tape may be recorded by using substantially an unrecorded region of the optical disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing system capable of recording / reproducing information with respect to a magnetic tape and a recordable optical disc housed in a video cassette.

  As is well known, in recent years, optical discs such as CDs and DVDs have become widespread as information recording media. Examples of the DVD include a read-only DVD-ROM, a recordable DVD-R, a rewritable DVD-RAM, and a DVD-RW. A recordable optical disk, that is, a recordable or rewritable optical disk has an information recording layer, and the recording capacity of the information recording layer is, for example, about 700 MB for a CD-R and about 4.7 GB for a DVD-R or the like. .

Recently, DVD recorders capable of recording / reproducing information on such recordable optical disks have begun to spread. Also, a DVD recorder with a built-in VTR that records information on a magnetic tape is commercially available. Patent Document 1 below discloses a video / audio recording system that enables video / audio data on a video tape to be copied to a DVD-RAM or the like in a state corresponding to the recording state.
JP 2001-16540 A (paragraphs 0009-0015, FIG. 1, pages 3-4)

  The technique disclosed in Patent Document 1 detects index data according to the recording state of a video tape, determines the division of video / audio data and the transport speed of the video tape, sets the image quality level, and the non-recording area of the video tape. And the end of recording on the recording medium is executed when copying to the DVD-RAM. None of the means describes a technique for making a good (capacitive) copy on a single disk. The recording time of video tape varies depending on the tape speed of 3x mode, standard mode, etc., the tape length of 60 minutes, 120 minutes, 180 minutes, etc. However, there is a problem that it cannot be replicated in a good manner (capacity).

  Therefore, in view of such problems, the present invention leaves the contents of the video tape (recorded portion) large on the contrary without exceeding the capacity of one DVD in the VTR and DVD recorder combined machine. The objective is to provide a system that can be copied to a DVD without duplication.

  The recording / playback system according to the present invention comprises VCR means for playing back a video / audio signal recorded on the magnetic tape T, and digital recording means for encoding the video / audio signal played back by the VCR means and recording it on an optical disc. In the recording / playback system, the VCR means includes a total recording time calculating means for calculating the total recording time of the magnetic tape stored in the video cassette, and the digital recording means is calculated by the total recording time calculating means. And an optimum recording rate calculation means for calculating an optimum recording rate for recording video and audio signals recorded on the magnetic tape from substantially the entire unrecorded area of the optical disk from the total recording time. It comprises.

  The dubbing method according to the present invention comprises VCR means for reproducing the video / audio signal recorded on the magnetic tape T, and digital recording means for encoding the video / audio signal reproduced by the VCR means and recording it on the optical disc D. In the recording / playback system, a method for dubbing the video / audio signal, wherein a total recording time of a magnetic tape stored in a video cassette is calculated, and an image recorded on the magnetic tape is calculated from the calculated total recording time. And an optimal recording rate for recording the audio signal by using substantially all of the unrecorded area of the optical disc, and digitally recording the video / audio signal reproduced by the VCR means at the calculated optimal recording rate. Means for dubbing on the optical disc.

  According to the present invention, one tape can be automatically duplicated on one DVD without excess or deficiency at an optimum recording rate set from detection of the total recording time of video / audio data on a video tape. .

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a recording / playback system according to an embodiment of the present invention. The recording / reproducing system 100 of this embodiment includes a VCR unit 10 that reproduces video / audio data recorded on a video tape, and a DVD as a recording medium by compressing and encoding the video / audio data reproduced by the VCR unit 10. A digital recording unit 20 for recording on a recordable optical disk D such as a RAM or a DVD-R, a hard disk drive (HDD) 29 for similarly recording compressed / encoded video / audio data on a hard disk, a VCR unit 10 and a digital recording A control unit 101 for system control of the unit 20 and a user interface 102 are provided. A control signal line and a video / audio signal line are provided between the VCR unit 10 and the digital recording unit 20.

  The VCR unit 10 includes a control unit 12 and a tape drive unit 11, and the digital recording unit 20 includes an A / D conversion unit 21, an encoder unit 22, a data processing unit 23, a disk drive unit 24, a decoder unit 25, A selector 26, a D / A converter 27, and a controller 28 are included.

  In the VCR unit 10, the control unit 12 controls the entire VCR unit 10 while exchanging control signals between the system control unit 101 and the control unit 28 of the digital recording unit 20 via the control signal line. Further, the tape drive unit 11 reproduces the video / audio data recorded on the video tape stored in the video cassette 7, and the video / audio data is converted into the A / V of the digital recording unit 20 through the video / audio signal line. The data is transmitted to the D conversion unit 21.

  On the other hand, in the digital recording unit 20, the control unit 28 controls the entire digital recording unit 20 while exchanging control signals between the system control unit 101 and the control unit 12 of the VCR unit 10 via the control signal line.

The A / D conversion unit 21 performs A / D conversion on video / audio data received from the drive unit 11 of the VCR unit 10 via the video / audio signal line, and the encoder unit 22 performs A / D converted video / audio. The data is compression-encoded, and the compression-encoded video / audio data is supplied to the disk drive unit 24 via the data processing unit 23. The disk drive unit 24 records the compressed / encoded video / audio data received from the encoder unit 22 on the optical disk D. The video / audio data recorded on the optical disc D is decoded by the decoder unit 25 via the data processing unit 23 and output to the selector 26. The selector 26 selects either the video / audio data from the VCR unit 10 received by the A / D conversion unit 21 or the video / audio data decoded by the decoder unit 25 and outputs it to the D / A conversion unit 27. To do. The D / A converter 27 D / A converts the video / audio data selected by the selector 26 and outputs the video / audio signal to a display device such as an AV television.
Next, the operation principle of the dubbing process of the recording / playback system according to this embodiment will be described.

  First, the operation principle of the optimum recording rate setting process using travel time information during dubbing of the recording / reproducing system 100 will be described with reference to FIGS.

  In general, the running time (recording or playback time) of a video tape is detected by using time information on the video tape recorded by a control head (not shown) in the longitudinal direction of the video tape during running. FIG. 2 is a diagram schematically showing recording tracks on the video tape. The video tape on which the signal is recorded has an audio track Ta, a video track Tv, and a control track Tc. An audio signal is recorded on the audio track Ta by an audio head (not shown), an image signal is recorded on the video track Tv by a cylinder head (not shown), and a control pulse is recorded on the control track Tc by the control head. Is done.

  FIG. 2A shows a signal recorded in the standard mode (left side in the figure) and a signal recorded in the triple mode (right side in the figure). If the cylinder head rotates at 30 revolutions / second, a video signal is recorded, and one control pulse is recorded every time the cylinder head makes one revolution. Since the running speed is three times different between the standard mode and the triple mode, the density of the control pulses is also three times different between the standard mode and the triple mode. FIG. 2B shows a reproduction waveform of the control pulse. When the tape is played back, the tape running speed is controlled so that the cycle of the control pulse is always constant.

  The recording / playback system 100 of this embodiment uses the travel time information (control pulse) to calculate the total recording time of the video tape, and based on the total recording time, the recording rate of the video / audio data to be recorded on the optical disc is calculated. The content recorded on one video tape is optimized so as to fit on one DVD disc.

  FIG. 3 is a flowchart showing the operation on the VCR side of the optimum recording rate setting process using the control pulse during dubbing.

  The control unit 12 first rewinds the video tape to the end using the tape drive unit 11 (step S101), and then fast-forwards without reproducing the video (step S102). The running time detection unit (control head) 11a A control pulse is detected (step S103). The detected control pulses are counted by the control unit 12 (step S104). The count of control pulses is fast-forwarded to the end of the video tape and ends when the tape stops (YES in step S105). The recording time calculation processing unit 12a calculates the total recording time from the counted number of control pulses, and transmits the total recording time to the control unit 28 of the digital recording unit 20 through a control signal (step S106).

  Next, the control unit 12 rewinds the video tape to the end again using the tape drive unit 11 (step S107), and waits for a preparation completion notification to be described later transmitted from the control unit 28 of the digital recording unit 20. (Step S108). When this preparation completion notification is received (YES in step S108), reproduction of video / audio data is started using the tape drive unit 11 (step S109).

  The control unit 12 performs the process of step S109 until the tape drive unit 11 detects the end of the video tape, and ends the process when the end of the video tape is detected (YES in step S110).

  FIG. 4 is a flowchart showing the operation of the optimum recording rate setting process on the digital recording unit 20 side using the control pulse during dubbing.

  When receiving the total recording time notification from the control unit 12 of the VCR unit 10 via the control signal line (YES in step S201), the control unit 28 uses the optimum recording rate setting processing unit 28a to record video / audio data on the optical disc. Is set to the optimum recording rate (step S202).

  FIG. 5 is a flowchart showing the optimum video recording rate calculation process.

  When the digital recording unit 20 records video / audio data on a DVD, for example, there is generally a longest recording time. This is because there is an upper limit for the value of the time information counter when recording time information added to video / audio data. Here, the longest recording time is 8 hours. The control unit 28 determines whether or not the total recording time Pt received from the control unit 12 exceeds 8 hours (step S301). If the total recording time Pt has exceeded, it notifies the control unit 12 that “dubbing is impossible” (step S302). The process is terminated. In this case, a warning message indicating “dubbing is not possible” is displayed on the screen of the display device connected to the present apparatus.

  If the total recording time Pt does not exceed 8 hours (YES in step S301), the control unit 28 displays the total recording time Pt (time required for dubbing) on the screen of the display device connected to the apparatus (step SS303), confirmation of the user is obtained whether dubbing can be started. In the case of “OK” (YES in step S304), the control unit 28 starts calculating the optimum recording rate using the optimum recording rate setting processing unit 28a.

  Hereinafter, a method for calculating the optimum recording rate by the optimum recording rate setting processing unit 28a will be described assuming that the total recording time Pt is 150 minutes.

  First, the total amount of audio data is calculated from the total recording time and the audio recording rate (step S305). For example, there are three types of DVD audio recording rates Ra: L-PCM (1.6 Mbps), DDM1 (384 Kbps), and DDM2 (192 Kbp). Here, it is assumed that DDM1 is selected by the user. Then, the total audio data amount Da is as follows (step S305).

Da = 384 × 1000 (b) × 150 (minutes) × 60 (seconds)
= 3456 (Mb)
= 432 (MB)
= 0.432 (GB)
Here, b is a bit and B is a byte.

  Next, the video capacity is calculated from the recording capacity of the DVD and the total amount of audio data (step S306). Assuming that the DVD recording capacity Cdvd is 4.7 GB, the capacity Cv that can be used for recording video data is 4.268 GB by subtracting the total audio data Da (0.432 GB) from the recording capacity Cdvd (4.7 GB). It becomes. As a result, the optimum recording rate Rv of video data is as follows when the video data amount is divided by the total recording time Pt.

Rv = 4.268 (GB) / (150 (minutes) × 60 (seconds))
= 0.47422 (MB / S)
= 3.749 (Mbps)
Accordingly, the optimum recording rate setting processing unit 28a sets the optimum recording rate Rv to 3.7 Mbps.

  When the optimum recording rate setting is completed, the control unit 28 transmits a preparation completion notification to the control unit 12 of the VCR unit 10 via the control signal line (step S203), and starts data recording on the DVD (step S204). Here, the control unit 28 compresses and encodes the video / audio data transmitted from the tape drive unit 11 of the VCR unit 10 via the video / audio signal line using the encoder unit 22 and the disk drive unit 24. Record on DVD.

Then, while the encoder unit 22 is receiving the video / audio data via the video / audio signal line (NO in step S205), the control unit 28 repeats the process of step S204 described above to receive the video / audio data. Is completed (YES in step S205), the process is terminated.
In this embodiment, the video / audio signal from the VCR unit 10 is directly recorded on the DVD. However, the video / audio signal from the VCR unit 10 is temporarily stored in the HDD 29 and then recorded on the optical disk from the HDD. May be. Furthermore, the DVD may be a disc that has been used (recorded) to some extent, even if it is not a completely unused disc. One video tape is dubbed to the DVD according to the free space of the DVD.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, only the video / audio data is recorded on the DVD without recording the non-recording area of the video tape on the DVD.

  In general, whether or not a video signal is recorded on a video tape is determined by detecting a signal such as the aforementioned control pulse or video envelope (envelope of the amplitude of the video signal). Therefore, the recording / playback system 100 according to the second embodiment records only the video / audio data without recording the non-recording area of the video tape for recording on the optical disc, and the recording rate in that case is optimized. The non-recording area may be detected by detecting the vertical and / or horizontal synchronizing signal of the input video of the digital recording unit 20.

    FIG. 6 is a flowchart showing a recording synchronization processing operation on the VCR unit side when a non-recording area is detected in dubbing. Steps S401 to S410 in FIG. 6 are the same as steps S101 to S110 in FIG.

  When the control unit 12 receives a preparation completion notification to be described later from the control unit 28 of the digital recording unit 20 via the control signal line (YES in step S410), the control unit 12 starts reproduction of video / audio data using the tape drive unit 11. (Step S411). Then, the control unit 12 repeats the processes of steps S413 to S419 unless the tape drive unit 11 finishes running the video tape (NO in step S412), and when the end of the video tape is detected (in step S412). YES), this process is terminated.

  When a non-recording area is detected during the reproduction of the video / audio data recorded on the video tape (YES in step S413), the control unit of the digital recording unit 20 sends a non-recording section start notification indicating the fact through the control signal line. 28 (step S414). Next, the control unit 12 waits for a recording pause notification to be described later transmitted from the control unit 28 of the digital recording unit 20 via the control signal line, and receives the recording pause notification (step S415). YES), it is determined whether or not the current tape playback position is a non-recording section (step S416), and fast-forward playback is performed to the position where video / audio data recording is started using the tape drive unit 11 according to the determination result. Alternatively, rewind playback is performed (steps S417 and S418). That is, when the current tape playback position is a non-recording section (YES in step S416), the tape is fast-forwarded to the next recording position, and the current tape playback position is already in the recording section (step S416). NO), the tape is rewound to the recording position.

  When the movement to the recording start position is completed (YES in step S420), a no-recording section end notification indicating that is transmitted to the control unit 28 of the digital recording unit 20 via the control signal line, and the reproduction process (step S411) is performed. Return.

  FIG. 7 is a flowchart showing a recording synchronization processing operation on the digital recording unit 20 side when a non-recording area is detected in dubbing.

  Upon receiving the total recording time notification (YES in step S501), the control unit 28 sets an optimum recording rate as in step S502, and transmits a preparation completion notification to the control unit 12 in the VCR unit 10 as in step S503. In step S504, data recording on the DVD is started. These steps S501 to 503 are the same as steps S201 to S203 in FIG.

  While the encoder unit 22 is receiving the video / audio data via the video / audio signal line (NO in step S505), the control unit 28 repeats the processes in steps S506 to S508 to receive the video / audio data. Is completed (YES in step S505), this process ends.

  When the control unit 28 receives a no-recording section start notification from the control unit 12 of the VCR unit 10 via the control signal line (YES in step S506), the control unit 28 pauses the recording of the video / audio data and starts the temporary stop. 10 control units 12 are notified (step S507). Accordingly, the recording of the video / audio data is automatically paused in synchronization with the detection of the non-recording area of the video tape.

  Subsequently, when the control unit 28 receives a no-recording section end notification from the control unit 12 of the VCR unit 10 via the control signal line (YES in step S508), the control unit 28 cancels the video / audio data recording pause and resumes the recording. (Step S504).

  In addition, when a remarkably short video signal (for example, video of 3 seconds or less) is recorded between the video contents reproduced by the VCR unit, such a video signal is deleted on the digital recording unit side. Also good.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  When recording video / audio signals on a video tape, a plurality of recording modes are generally prepared such as a standard mode and a triple mode. In the case of the third embodiment, the DVD recording rate is set in accordance with the recording mode of the video / audio signal recorded on the video tape. Hereinafter, the third embodiment will be described by taking as an example a case where video is recorded on the video tape in the standard mode and the triple mode.

  FIG. 8 is a flowchart showing the operation of the VCR unit 10 according to the third embodiment.

  This flowchart is the same as the flowchart of the VCR unit 10 shown in FIG. 3, but the steps in the thick line frame are different from those in FIG. Therefore, steps different from those in FIG. 3 will be mainly described.

  When the travel time detection unit (control head) 11a detects a control pulse (YES in step S103), the control unit 12 counts the control pulses and detects the recording mode from the tape travel speed and the cycle of the control pulses (step). S601). In step S602, the total recording time in each recording mode is calculated, and the calculation result is transmitted to the control unit 28. Here, the total recording time in the standard mode is Psp, and the total recording time in the 3 × mode is Plp. In step S603, video playback processing is performed and the current image mode is transmitted.

  FIG. 9 is a flowchart showing the operation of the digital recording unit 20 according to the third embodiment.

  When receiving the notification of the total recording time in each recording mode from the control unit 12 of the VCR unit 10 via the control signal line (YES in step S701), the control unit 28 uses the optimum recording rate setting processing unit 28a. The optimum recording rate for recording the video / audio data on the optical disc is set for each recording mode (step S702).

  FIG. 10 is a flowchart showing optimum video recording rate calculation processing according to the third embodiment.

  The control unit 28 determines whether the sum of the total recording time Psp in the standard mode and the total recording time Plp in the triple mode received from the control unit 12 exceeds 8 hours (step S801). The control unit 12 is notified that “dubbing is not possible” (step S802), and the process ends.

  When the total of the total recording times Psp and Plp in each recording mode does not exceed 8 hours (YES in step S801), the control unit 28 stores the total recording times Psp and Plp (time required for dubbing) in each recording mode. The information is displayed on the screen of the display device connected to the device (step S804), and the user's confirmation is obtained whether dubbing can be started. In the case of “OK” (YES in step S804), the control unit 28 starts calculating the optimum recording rate in each recording mode using the optimum recording rate setting processing unit 28a.

  Hereinafter, assuming that the total recording time Psp in the standard mode is 90 minutes, the total recording time Plp in the triple mode is 60 minutes, and the audio recording rate Ra of the DVD is DDM1 (384 Kbps), the optimum recording rate setting processing unit 28a A method for calculating the optimum recording rate according to the above will be described.

  First, the total audio data amount Da is calculated from the total recording time sum “Psp + Plp” and the audio recording rate Ra (step S805). Since the total recording time “Psp + Plp” is 150 minutes, the total audio data amount Da is as follows.

Da = 384 × 1000 (b) × 150 (minutes) × 60 (seconds)
= 3456 (Mb)
= 432 (MB)
= 0.432 (GB)
Here, b is a bit and B is a byte.

  Next, a video capacity Cv that can be used for recording video data is calculated from the DVD recording capacity Cdvd and the total audio data amount Da (step S806). When the recording capacity Cdvd of the DVD is 4.7 GB, the video capacity Cv is 4.268 GB by subtracting the total audio data amount Da (0.432 GB) from the recording capacity Cdvd (4.7 GB).

  When the DVD video recording rate corresponding to the standard recording mode (step SP) is Rsp, and the DVD video recording rate corresponding to the triple mode (LP) is Rlp, the video capacity Cv and the DVD video recording rates Rsp and Rlp are as follows. A relationship is established.

Cv = [Rsp × 90 (minutes) × 60 (seconds)
+ Rlp × 90 (minutes) × 60 (seconds)] / (8 × 10 ⁹ )
Rsp = 3 × Rlp
Solving the above two equations,
Rlp = 1.58Mbps
Rsp = 4.74 Mbps
Accordingly, the optimum recording rate setting processing unit 28a determines that the DVD video recording rate Rlp corresponding to the triple mode is 1.5 Mbps and the DVD video recording rate Rsp corresponding to the standard recording mode is 4.7 Mbps.

  Returning to the description of FIG. 9, when each optimum recording rate is determined, the control unit 28 transmits a setting completion notification to the control unit 12 of the VCR unit 10 via the control signal line (step S703). When the control unit 28 receives the recording mode of the video tape that has started playback from the control unit 12 of the VCR unit 10 (YES in step S704), the recording rate corresponding to the recording mode (the recording rate Rsp or Rlp calculated in step S702). ), Digital recording processing is performed (step S704). In this way, digital recording processing is performed at a recording rate corresponding to each recording mode. This digital recording process ends when a video tape end notification is received (YES in step S706).

  The above description is an embodiment of the present invention and does not limit the apparatus and method of the present invention, and various modifications can be implemented. Such modifications are also included in the present invention. In addition, an apparatus or a method configured by appropriately combining components, functions, features, or method steps in each embodiment is also included in the present invention.

1 is a schematic configuration diagram showing a recording / playback system according to an embodiment of the present invention. The figure which shows typically the recording track on a videotape. 7 is a flowchart showing an operation procedure on the VCR side of an optimum recording rate setting process in the recording / reproducing system according to the embodiment. 7 is a flowchart showing an operation procedure on the digital recording unit side of an optimum recording rate setting process in the recording / reproducing system according to the embodiment. The flowchart which shows the optimal video recording rate calculation process. 7 is a flowchart showing an operation procedure on the VCR side of an optimum recording rate setting process and a recording synchronization process when a non-recording area is detected in the recording / reproducing system according to the embodiment. 6 is a flowchart showing an operation procedure on the digital recording unit side of an optimum recording rate setting process and a recording synchronization process when a non-recording area is detected in the recording / reproducing system according to the embodiment. 9 is a flowchart showing the operation of the VCR unit 10 according to the third embodiment. FIG. 9 is a flowchart showing the operation of the digital recording unit 20 according to the third embodiment. 10 is a flowchart showing optimum video recording rate calculation processing according to the third embodiment.

Explanation of symbols

  T ... magnetic tape, D ... recording medium, 10 ... VCR unit, 11 ... tape drive unit, 11a ... running time detection unit, 11b ... non-recording area detection unit, 12 ... control unit, 12a ... recording time calculation processing unit, 12b ... Non-recording area processing unit, 20 ... Digital recording unit, 21 ... A / D conversion unit, 22 ... Encoder unit, 23 ... Data processing unit, 24 ... Disk drive unit, 25 ... Decoder unit, 26 ... Selector, 27 ... D / A conversion unit, 28 ... control unit, 28a ... optimum recording rate setting processing unit, 28b ... tape recording signal synchronization processing unit, 100 ... recording / playback system, 101 ... control unit, 102 ... user interface.

Claims (11)

In a recording / reproducing system comprising a VCR means for reproducing a video / audio signal recorded on a magnetic tape T, and a digital recording means for encoding the video / audio signal reproduced by the VCR means and recording it on an optical disc D.
The VCR means comprises total recording time calculating means for calculating the total recording time of the magnetic tape stored in the video cassette,
The digital recording means records video and audio signals recorded on the magnetic tape from the total recording time calculated by the total recording time calculation means by using substantially all unrecorded areas of the optical disk. And a recording / reproducing system comprising: an optimum recording rate calculating means for calculating an optimum recording rate for the recording. The VCR means comprises control pulse detection means for detecting a control pulse recorded on the magnetic tape, and the total recording time calculation means counts the control pulses detected by the control pulse detection means, 2. The recording / playback system according to claim 1, wherein the total recording time is calculated based on a numerical value. The VCR means comprises a no-recording area detecting means for detecting a no-recording area of the magnetic tape T and notifying the start of the no-recording area;
2. The digital recording unit according to claim 1, wherein the recording of the video / audio signal from the VCR unit to the optical disc is stopped in response to a notification of the start of the non-recording region from the non-recording region detection unit. Recording and playback system. The VCR means comprises control pulse detection means for detecting a control pulse recorded on the magnetic tape, and based on the detection of the non-recording area detection means and the control pulse, a non-recording area on the magnetic tape is detected. The recording / playback system according to claim 1, wherein the recording / playback system is detected. 2. The recording / reproducing system according to claim 1, wherein the VCR means detects a non-recording area on the magnetic tape based on detection of an amplitude envelope of the magnetic tape reproduction video signal. The digital recording means comprises means for notifying that recording on the optical disc has been stopped;
4. The recording / reproducing system according to claim 3, wherein the VCR means fast-forwards the tape to the next recording position in response to the stop notification. The VCR means comprises means for notifying the end of the non-recording area when the fast-forwarding of the tape to the next recording position is completed,
5. The recording according to claim 4, wherein the digital recording unit resumes recording of the video / audio signal from the VCR unit on the optical disc in response to a notification of the end of the non-recording area from the VCR unit. Playback system. The optimum recording rate calculation means includes:
Means for calculating the amount of audio data recorded on the optical disc from the total recording time calculated by the total recording time calculating means and the audio recording rate of the digital recording means;
Means for calculating a video capacity recordable on the optical disc from the free space of the optical disc and the calculated amount of audio data;
Means for calculating the optimum video recording rate from the calculated video capacity and the total recording time;
The recording / playback system according to claim 1, further comprising: VCR means for reproducing video and audio signals recorded on a magnetic tape in a plurality of recording speed modes, and digital recording means for encoding the video and audio signals reproduced by the VCR means and recording them on an optical disk In the system,
The VCR means comprises total recording time calculating means for calculating the total recording time of the magnetic tape stored in the video cassette, and means for detecting the plurality of recording speed modes of the video signal recorded on the magnetic tape. ,
The digital recording means may be configured such that the video and audio signals recorded in the plurality of recording modes on the magnetic tape from the total recording time calculated by the total recording time calculation means substantially unrecorded areas of the optical disc. And a recording / playback system comprising: an optimum recording rate calculating means for calculating a plurality of recording rates corresponding to each recording speed mode. The VCR means comprises control pulse detection means for detecting a control pulse recorded on the magnetic tape, and the total recording time calculation means counts the control pulses detected by the control pulse detection means, The recording / playback system according to claim 9, wherein the total recording time is calculated based on a numerical value. The video / audio signal in a recording / playback system comprising: VCR means for reproducing a video / audio signal recorded on a magnetic tape; and a digital recording means for encoding the video / audio signal reproduced by the VCR means and recording it on an optical disk. Dubbing method of
Calculate the total recording time of the magnetic tape stored in the video cassette,
From the calculated total recording time, an optimal recording rate for recording video and audio signals recorded on the magnetic tape by using substantially all unrecorded areas of the optical disc is calculated,
A dubbing method comprising: dubbing a video / audio signal reproduced by a VCR means at the calculated optimum recording rate onto the optical disc using a digital recording means.

Images