JPH08129860A - High speed editing vtr - Google Patents

Abstract

PURPOSE: To edit the video/audio part to be recorded for a long time a short time by providing a data recording/reproducing part in which a group of magnetic heads are arranged, a reproduced signal processing part for synthesizing reproduced signals for one track and a recording signal processing part for recording video/audio data. CONSTITUTION: In a data synthesizing circuit 16, data after error correction for two traces is stored together with the frequency of errors for every block in a memory. By sequentially selecting data of low error frequency block out of two traces, data for one track are synthesized and outputted. In this case, by increasing the tracing speed of a magnetic head on the track, the video/audio part to be recorded for a long time can be edited in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high speed editing VTR for editing video / audio data digitally recorded on a magnetic tape at high speed.

[0002]

2. Description of the Related Art Video / audio data digitally recorded on a diagonal track of a magnetic tape A at a data rate R [bps] is recorded (edited) on another magnetic tape B at a predetermined position.
In this case, in the conventional editing VTR, the video / audio data is reproduced from the magnetic tape A at the data rate R [bps], and the video / audio data is recorded on the magnetic tape B at the data rate R [bps]. Edit.

[0003]

However, in this case, the recording time of the video / audio to be edited is the minimum required as the time required for editing, and long editing is required to edit the video / audio part of long recording time. It takes time.

In view of the above problems, it is an object of the present invention to provide a VTR for high speed editing, which can edit a video / audio portion having a long recording time in a short time.

[0005]

In order to solve the above problems, the present invention relates to a magnetic tape for transmitting video / audio data having a data rate R [bps] at a tape feeding speed X [mm / s]. A digital VTR for digitally recording on an oblique track of a magnetic tape by a magnetic head arranged on a rotating cylinder having a rotation angle N [rpm] having a lead angle of θ [°].
A VTR for high-speed editing for high-speed editing of video / audio data recorded by using a magnetic tape feed speed of M · X [mm / s] (M is an integer of 2 or more) or X [ mm /
s], and at least one set of magnetic head groups facing each other at about 180 [°] on a rotating cylinder having a lead angle of θ [°] with respect to the magnetic tape and having a rotation speed of M · N [rpm]. Through the data recording / reproducing section arranged as described above, the tape feeding speed is set to M · X [mm / s] at the time of high-speed reproduction, and the magnetic tape on which the video / audio data is recorded by the digital VTR is passed through a set of magnetic heads. Video / audio data with a data rate of M / R [bps] is played back, and the tape feed speed is X [m during normal playback.
m / s], a set of magnetic heads reproduces one track's worth of reproduced signals from the reproduced signals traced M times on the magnetic tape to reproduce video / audio data at a data rate R [bps]. The signal processing unit and the tape feed speed during high-speed recording are set to M · X [mm / s], and video / data at the data rate M · R [bps] is recorded on the track to be re-recorded by one magnetic head group.
And a recording signal processing unit for recording audio data.

[0006]

According to the present invention, with the above construction, the data rate of the reproduced video / audio data is recorded by increasing the tracing speed of the magnetic head tracing the oblique track or simultaneously tracing by a plurality of magnetic heads. By making the recording rate higher than the recording rate and recording at the reproduction data rate, a video / audio portion having a long recording time can be edited in a short time.

[0007]

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

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. The magnetic tape 2 has a rotation speed N [rpm]
L placed on the rotating cylinder of
Video / audio data is recorded at a recording rate of R [bps] by a pair of recording magnetic heads of azimuth and R azimuth. At this time, the tape feeding speed is X [mm / s], and the lead angle which is the inclination angle of the magnetic tape with respect to the rotating cylinder is θ [°]. In this case, the recording tracks on the magnetic tape are diagonal tracks recorded alternately by the magnetic heads of L azimuth and R azimuth as shown in FIG.

First, a reproducing system portion for outputting a reproduced digital signal for high-speed editing or a normal reproduced analog signal from the magnetic tape will be described. The rotary cylinder and tape part are L azimuth and R at 180 ° opposite position.
A rotating cylinder unit 1 at a rotation speed of 2 N [rpm] in which three sets of azimuth reproducing magnetic heads 3 and 4, recording magnetic heads 5 and 6, and erasing magnetic heads 7 and 8 are arranged, and a magnetic tape 2. The tape drive unit has a feed speed of 2X [mm / s] during high-speed editing and X [mm / s] during normal playback. In addition,
The lead angle of the magnetic tape is θ [°], which is the same as a normal VTR used for recording. At the time of high-speed editing, both the feed speed of the magnetic tape 2 and the rotation speed of the rotary cylinder are twice as high as usual (cylinder rotation speed 2N [rpm], tape feed speed 2X [mm / s]). Traces on a track recorded with the same azimuth at twice the normal speed.
Therefore, a reproduction signal 91 obtained by compressing the normal reproduction signal into 1/2 is obtained. The reproduction signal 91 is equalized by the reproduction equalization circuit 9, and the equalized signal 92 is converted by the data identification circuit 10 into digital data 101 having a data rate of 2R [bps]. After that, the error is corrected by the error correction circuit 11, and the high-speed editing digital signal 111
Is output from the output terminal 12. Details of the reproduction equalization circuit, the data identification circuit, and the error correction circuit are described in "Digital Video Recording Technology", published by Nikkan Kogyo Shimbun, p52-72, p89.
~ 122.

During normal reproduction, the magnetic tape feed speed is the same as that during normal playback, and only the rotational speed of the rotating cylinder is twice the normal speed (cylinder rotational speed 2N [rpm], tape feed speed X).
[mm / s]), the reproduction heads 3 and 4 trace twice on one track of the same azimuth at a track angle slightly deviated from the recording track angle at a speed twice as fast as usual. The trace trace of the center of the reproducing head 3 is shown by the dotted line in FIG.
In this case, the data recorded on a certain track is reproduced twice as shown in FIG. 3A, and the amplitude changes depending on the on-track state of the head.
In the case of normal reproduction, the error-corrected data 111 is input to the data synthesizing circuit 16. In the data synthesis circuit 16,
Data after error correction for two traces (shown in FIG. 3B) is stored in the memory together with the error frequency for each block. Then, the data of one track (data rate R [bps]) is combined and output by sequentially selecting the data of the block having a low error frequency of the two traces (shown in FIG. 3C). ). In order to reduce the error frequency of the synthesized data, the amplitude acquisition rate of the reproduced signal for two traces may be increased. For that purpose, the head width of the reproducing magnetic head may be set wider than the recording track pitch width.

The combined data 161 is expanded by the data expansion circuit 17 into video / audio data 171 before data compression, and a digital / analog converter (D / A) 18 is provided.
The video / audio signal 181 is output from the output terminal 19 as an analog signal.

Next, the recording system portion for recording the reproduced digital signal output for high-speed editing will be described. Reproduction digital signal (data rate 2R [bps]) 2
01 is input from the input terminal 20 and converted into a recording signal 211 by the recording modulation circuit 21. Details of the recording modulation circuit are described in "Digital Video Recording Technology", pages 36-52, published by Nikkan Kogyo Shimbun. The recording data on the track to be re-recorded is the erasing signal 2 from the erasing signal generating circuit 22 to the erasing magnetic heads 5 and 6 preceding the recording magnetic head.
By giving 01, it is erased before recording. Thereafter, the recording signal 211 is supplied from the recording modulation circuit 21 to the recording magnetic heads 5 and 6 to record the video / audio data.

In the first embodiment having the above configuration, the trace speed of the magnetic head on the track is increased to make the data rate of the reproduced video / audio data higher than the recording rate at the time of recording, and the reproduced data rate. By recording with, it is possible to edit a video / audio portion having a long recording time in a short time. Further, by utilizing the reproduction system signal processing unit for outputting the high-speed reproduction data and performing the data synthesizing process, the normal reproduction is possible without changing the rotation speed of the rotary cylinder.

Here, three magnetic heads for reproduction, a magnetic head for recording and a magnetic head for erasing are mounted on the rotary cylinder.
Although it is assumed that the sets are arranged, as shown in FIG. 4A, one set of magnetic heads 23 and 24 may perform both recording and reproduction. In this case, without erasing prior to recording,
Overwrite recording on the recording track. Also, FIG.
As shown in (b), a configuration in which one set of magnetic heads 3 and 4 for reproduction and one set of magnetic heads 5 and 6 for recording may be arranged. Also in this case, overwrite recording is performed on the recording track without erasing prior to recording. In addition, FIG.
As shown in FIG. 7, a configuration may be used in which one set of magnetic heads 25 and 26 for both reproducing and erasing and one set of magnetic heads 5 and 6 for recording are arranged. In this case, erasing prior to recording is performed by a pair of magnetic heads 25 for both reproduction and erasure.
26.

The case where the rotary cylinder is rotated at twice the normal rotation speed has been described, but the tape feeding speed is set to MX [mm / s] when rotating at a rotation speed three times or more M times. The same is true by doing.

Next, a second embodiment of the present invention will be described with reference to FIG. As described in the first embodiment, video / audio data is recorded on the magnetic tape in diagonal tracks. A reproducing system portion for obtaining a reproduced digital signal output or a normal reproduced analog signal output for high speed editing from the magnetic tape will be described. In the rotating cylinder 60,
Two sets of magnetic heads for reproduction, one set of magnetic heads 27 and 29 both being L azimuth, and one set of magnetic heads 28 and 30 being R azimuth, which are both L azimuth, at positions opposite to each other by 180 °. R together with a pair of magnetic heads 31, 33
A total of two sets of recording magnetic heads, one set of magnetic heads 32 and 34 being azimuth, and one set of magnetic heads 35 and 37 being both L azimuth, and one set of magnetic heads 36 and 38 being R azimuth. 2 sets of magnetic heads for erasing are arranged, and the rotation speed is N [rpm] which is the same as usual. The feeding speed of the magnetic tape 2 is 2X [m
m / s], X [mm / s] during normal playback. Incidentally, the lead angle of the magnetic tape 2 with respect to the rotary cylinder 60 is normally used for recording so that the magnetic head traces an oblique track on the magnetic tape when the magnetic tape feeding speed is 2 × [mm / s]. Is set to an angle different from the lead angle of the VTR. During high-speed editing, two sets of reproducing magnetic heads simultaneously trace adjacent tracks on the magnetic tape.
Therefore, the reproduction signals 93 and 94 of two systems are obtained at the same time. Each reproduction signal is equalized by the reproduction equalization circuit 62. The equalized signals are data identification circuits 6 respectively.
The data is converted into digital data having a data rate R [bps] by 3, and the error is corrected by the error correction circuit 64.
Two lines of error-corrected digital data 641, 64
2 is output terminals 43, 4 as digital signals for high-speed editing
It is output from 4.

During normal reproduction, the feeding speed of the magnetic tape is the same as that in normal operation, X [mm / s], so that the two sets of reproducing heads 27 and 28 are slightly displaced from the recording track angle on the same azimuth track. Trace at a different track angle. An outline of the trace loci of the two reproducing heads is shown by the dotted line in FIG. In this case, the reproduction signals 93 and 94 of the two systems are shown in FIG.
As shown in (a) and (b), the amplitude varies depending on the on-track state of the head. In the case of normal reproduction, the error-corrected two systems of data 641 and 642 are input to the data synthesis circuit 42. In the data synthesis circuit, two types of data are stored in the memory together with the error frequency for each block. Then, the data of one track is combined and output by sequentially selecting the data of the blocks with low error frequency in the two systems. In order to reduce the error frequency of the combined data, the amplitude acquisition rate of the reproduced signals of the two systems should be increased. For that purpose, the head width of the reproducing magnetic head may be set wider than the recording track pitch width.

The synthesized data 421 is expanded by the data expansion circuit 17 into video / audio data 172 before data compression, and the digital / analog converter (D / A) 18
The video / audio signal 182 is output from the output terminal 45 as an analog signal.

Next, a recording system portion for recording a reproduced digital signal for high speed editing will be described. Two systems of reproduced digital signals (both data rate R [bps]) 641,
642 is input from the input terminals 39 and 40, and converted into recording signals 611 and 612 by the recording modulation circuit 61, respectively. The recording data on the track to be re-recorded is erased prior to recording by applying the erasing signals 411 and 412 from the erasing signal generating circuit 41 to the two sets of erasing magnetic heads preceding the recording magnetic head. After that, the recording signals 611 and 61 from the recording modulation circuit are applied to the two sets of recording magnetic heads.
By giving 2, video / audio data is recorded.

In the second embodiment having the above construction, a plurality of sets of magnetic heads are used to trace a plurality of tracks at the same time so that a plurality of reproduction video / audio data having the same data rate as the recording rate can be recorded. By reproducing the data simultaneously and recording the data of the plurality of systems on a plurality of tracks at the same time, it is possible to edit a video / audio portion having a long recording time in a short time. Further, by utilizing the reproduction system signal processing unit for outputting the high-speed reproduction data and performing the data synthesizing process, the normal reproduction is possible without changing the rotation speed of the rotary cylinder.

Although it is assumed here that two sets of reproducing magnetic heads, two sets of recording magnetic heads, and two sets of erasing magnetic heads are arranged on the rotary cylinder, FIG.
2 sets of magnetic heads 46, 47, 48, 49
Both recording and reproduction may be performed with. In this case, erasing is not performed prior to recording, but overwrite recording is performed on the recording track. In addition, as shown in FIG.
A configuration in which a set of magnetic heads 27, 28, 29, 30 and two sets of recording magnetic heads 31, 32, 33, 34 are arranged may be used. Even in this case, erasing prior to recording is not performed,
Overwrite recording on the recording track. Also, FIG.
As shown in (c), a configuration in which two sets of magnetic heads 50, 51, 52, 53 for both reproducing and erasing and two sets of magnetic heads 31, 32, 33, 34 for recording are arranged. good. In this case, erasing prior to recording is performed by two sets of magnetic heads for both reproducing and erasing.

The case where two sets of magnetic heads for recording / reproducing / erasing are arranged has been described.
The same applies when the number of magnetic heads of M or more is used and the tape feeding speed is MX [mm / s].

Next, a third embodiment of the present invention will be described with reference to FIG. As described in the first embodiment, video / audio data is recorded on the magnetic tape in diagonal tracks. First, a reproducing system portion for obtaining a reproduced digital signal output or a normal reproduced analog signal output for high speed editing from this magnetic tape will be described. Rotating cylinder 68
In the same manner as in the second embodiment, two sets of reproducing magnetic heads, two sets of recording magnetic heads and two sets of erasing magnetic heads are arranged in the disk, and the number of revolutions is 2N, which is twice the normal number. It is [rpm]. Also, the feeding speed of the magnetic tape is 4 for high-speed editing.
X [mm / s], X [mm / s] during normal playback. The lead angle of the magnetic tape with respect to the rotary cylinder is a normal VTR used for recording so that the magnetic head traces an oblique track on the magnetic tape when the magnetic tape feed speed is 4X [mm / s]. The lead angle is set to a different angle. During high-speed editing, two sets of reproducing magnetic heads that are adjacent to each other are simultaneously traced on the magnetic tape at twice the normal speed. Therefore, the reproduction signals 95 and 96 obtained by time-compressing the normal reproduction signal to 1/2 are simultaneously obtained. Each reproduction signal is equalized by the reproduction equalization circuit 9. The equalized signal is converted into digital data having a data rate of 2R [bps] by the data identification circuit 10 and error-corrected by the error correction circuit 11. Two lines of error-corrected digital data (data rate 2R
[bps] × 2) 114 and 115 are output from the output terminals 58 and 59 as high speed editing digital signals.

Further, during normal reproduction, the feeding speed of the magnetic tape becomes the same as during normal reproduction, so that two sets of reproduction heads 2 are used.
In Nos. 7 and 28, the same azimuth track is traced twice with a track angle slightly deviated from the recording track angle. The trace trajectories of two sets of reproducing heads twice are shown by dotted lines in FIG. In this case, the reproduction signal 95 of two systems,
The amplitude of 96 varies depending on the on-track state of the head as shown in FIGS. 11 (a) and 11 (b). In the case of normal reproduction, error-corrected two-system data 114, 11
5 is input to the data synthesis circuit 56. In the data synthesizing circuit, data for two traces in two systems is stored in the memory together with the error frequency of each block. Then, the data of one track is combined by sequentially selecting the data of the block having a low error frequency out of the two traces in the two systems. 2 to reduce the error frequency of the synthesized data
It suffices to increase the amplitude acquisition rate of the reproduced signal for two traces in the system. For that purpose, the head width of the reproducing magnetic head may be set wider than the recording track pitch width.

The combined data 561 is expanded by the data expansion circuit 17 into video / audio data 172 before data compression, and the digital / analog converter (D / A) 18
The video / audio signal 182 is output from the output terminal 57 as an analog signal.

Next, the recording system portion for recording the reproduced digital signal for high speed editing will be described. Two systems of reproduced digital signals (both data rate 2R [bps]) 11
4, 115 are input from the input terminals 54, 55, and are converted into recording signals 214, 215 by the recording modulation circuit 21, respectively. The recorded data on the track to be re-recorded is erased prior to recording by applying erase signals 691 and 692 from the erase signal generating circuit 69 to the erase magnetic head preceding the recording magnetic head. Then, the recording signals 214 and 215 from the recording modulation circuit are applied to the recording magnetic head to record the video / audio data.

With the above configuration, in the third embodiment, a plurality of sets of magnetic heads simultaneously trace a plurality of tracks at a high speed to record a total data rate of reproduced video / audio data. Higher,
By recording at the reproduction data rate, it is possible to edit a video / audio portion having a long recording time in a short time.
Further, by utilizing the reproduction system signal processing unit for outputting the high-speed reproduction data and performing the data synthesizing process, the normal reproduction is possible without changing the rotation speed of the rotary cylinder.

Although it is assumed here that two sets of reproducing magnetic heads, two sets of recording magnetic heads, and two sets of erasing magnetic heads are arranged on the rotary cylinder, the second embodiment is different from the second embodiment. Similarly, as shown in FIGS. 8A, 8B and 8C, a magnetic head may be arranged. However, the rotation speed of the rotary cylinder is 2N [rpm], which is twice the normal rotation speed.

Further, the case where the rotating cylinder in which two sets of magnetic heads for recording / reproducing / erasing are arranged is rotated at twice the normal rotation speed has been described.
Even when one set of magnetic heads is arranged and the magnetic head is rotated at a rotation speed of M2 times which is three times or more as usual, the same holds when the tape feeding speed is set to M1 * M2 * X [mm / s].

[0030]

As described above, according to the present invention, the video / audio data recorded on the magnetic tape can be reproduced without error even if the feeding speed of the magnetic tape is increased. It is possible to shorten the time required for editing. Further, by utilizing the reproduction system signal processing unit for outputting high-speed reproduction data and synthesizing the data, normal reproduction can be performed without changing the rotation speed of the rotary cylinder.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a VTR for high speed editing according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a trace locus of a pair of reproducing heads during normal reproduction in the first embodiment of the present invention.

FIG. 3 is a signal waveform diagram showing how reproduction data is synthesized from reproduction signals during normal reproduction in the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing an example of arrangement of recording / reproducing / erasing magnetic heads on a rotating cylinder in the first embodiment of the present invention.

FIG. 5 is a block diagram showing the configuration of a VTR for high speed editing according to a second embodiment of the present invention.

FIG. 6 is a schematic diagram showing trace trajectories of two sets of reproducing heads during normal reproduction in the second embodiment of the present invention.

FIG. 7 is a signal waveform diagram showing how reproduction data is combined from reproduction signals of two systems during normal reproduction in the second embodiment of the present invention.

FIG. 8 is a schematic view showing an arrangement example of recording / reproducing / erasing magnetic heads on a rotating cylinder in a second embodiment of the present invention.

FIG. 9 is a block diagram showing the configuration of a VTR for high speed editing according to a third embodiment of the present invention.

FIG. 10 is a schematic diagram showing trace trajectories of two sets of reproducing heads during normal reproduction in the third embodiment of the present invention.

FIG. 11 is a signal waveform diagram showing reproduced signal waveforms of two systems during normal reproduction in the third embodiment of the present invention.

[Explanation of symbols]

1 rotating cylinder 2 magnetic tape 3, 4, 27, 28, 29, 30 reproducing magnetic head 5, 6, 31, 32, 33, 34 recording magnetic head 7, 8, 35, 36, 37, 38 erasing magnetic Heads 23, 24, 46, 47, 48, 49 Recording / reproducing magnetic heads 25, 26, 50, 51, 52, 53 Reproducing / erasing magnetic heads 9, 13 Reproducing equalizing circuit 10, 14 Data identifying circuit 11, 15 Error Correction circuit 16, 42, 56 Data synthesis circuit 17 Data expansion circuit 18 Digital / analog converter 21 Recording modulation circuit 22, 41 Erase signal generation circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruo Isaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hideaki Mukai 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (21)

[Claims] 1. A rotational speed N [rpm] having a lead angle of θ [°] with respect to a magnetic tape which transmits video / audio data having a data rate R [bps] at a tape feeding speed X [mm / s]. A VTR for high-speed editing for editing video / audio data recorded at high speed using a digital VTR for digitally recording on diagonal tracks of a magnetic tape by a magnetic head arranged on a rotating cylinder of Tape feeding speed is M · X [mm / s] (M is an integer of 2 or more) or X [mm / s]
And at least one set of magnetic head groups facing each other at approximately 180 [°] is arranged on a rotating cylinder having a lead angle of θ [°] with respect to the magnetic tape and a rotational speed of M · N [rpm]. The data recording / reproducing section, and the tape feeding speed at the time of high speed reproduction are set to M · X [mm / s], and the data rate is passed from the magnetic tape on which the video / audio data is recorded by the digital VTR through one set of magnetic heads. M / R [bps] video / audio data is played back, and the tape feed speed is X [mm /
[s]], reproduction signal processing for reproducing video / audio data at a data rate R [bps] by synthesizing a reproduction signal for one track from a reproduction signal traced M times on the magnetic tape by a set of magnetic heads. And a recording signal processing unit for recording video / audio data at a data rate M · R [bps] on a track by a set of magnetic heads with a tape feed speed of M · X [mm / s] during high-speed recording. A VTR for high-speed editing, which is composed of 2. A VTR for high speed editing according to claim 1, wherein M = 2. 3. A VTR for high-speed editing according to claim 1, wherein only one set of magnetic head groups for performing both reproduction and recording is arranged on the rotary cylinder. 4. A high-speed editing VT according to claim 1, wherein one set of magnetic heads for reproduction and one set of magnetic heads for recording are arranged on the rotary cylinder.
R. 5. A rotary cylinder has a set of a magnetic head group for reproduction, a set of magnetic head groups for recording, and a magnetic head for recording for erasing recorded data on a track prior to the magnetic head. 2. A high-speed editing VTR according to claim 1, wherein a set of magnetic heads for erasing is arranged. 6. Video / audio data is reproduced by a set of reproducing magnetic heads having a head width wider than a track pitch width which is a distance between an oblique track and an adjacent track recorded on a magnetic tape. Claim 1 characterized by the above.
VTR for high-speed editing described. 7. A set of magnetic heads for reproduction and a set of magnetic heads for erasure.
6. The VTR for high speed editing according to claim 5, wherein it is shared by a set of magnetic head groups. 8. A rotational speed N [rpm] having a lead angle of θ [°] with respect to a magnetic tape which sends video / audio data having a data rate R [bps] at a tape feeding speed X [mm / s]. A VTR for high-speed editing for editing video / audio data recorded at high speed using a digital VTR for digitally recording on diagonal tracks of a magnetic tape by a magnetic head arranged on a rotating cylinder of Tape feeding speed is M · X [mm / s] (M is an integer of 2 or more) or X [mm / s]
.Theta.1 [.degree.] (.Theta.1 is different from .theta. With respect to the magnetic tape so that the magnetic head traces on an oblique track on the magnetic tape when the feeding speed of the magnetic tape is M.X [mm / s]. Value) and a data recording / reproducing section in which at least one or more M magnetic head groups facing approximately 180 [°] are arranged on a rotating cylinder having a rotational speed N [rpm], and a tape during high-speed reproduction. Video / audio data having a data rate R [bps] of M system from a magnetic tape on which video / audio data is recorded by the digital VTR, with a feed speed of M · X [mm / s]. At the tape feed speed of X [mm / s] during normal playback, and by synthesizing one playback signal from the M playback signals from the M magnetic head groups, the data rate R [bps] Playback signal processing unit that plays back video / audio data, and high-speed recording At the time of recording, the tape feed speed is set to M · X [mm / s], and it is composed of a recording signal processing unit that records video / audio data of M system data rate R [bps] on a track by M magnetic head groups. A VTR for high speed editing characterized by being performed. 9. The VTR for high speed editing according to claim 8, wherein M = 2. 10. The VTR for high speed editing according to claim 8, wherein only M sets of magnetic head groups for performing both reproduction and recording are arranged on the rotary cylinder. 11. A VT for high-speed editing according to claim 8, wherein M magnetic head groups for reproduction and M magnetic head groups for recording are arranged on the rotary cylinder.
R. 12. A rotary cylinder for erasing recorded data on a track prior to M magnetic head groups for reproduction, M magnetic head groups for recording and a magnetic head for recording. 9. The VTR for high speed editing according to claim 8, wherein M magnetic head groups for erasing are arranged. 13. Video / audio data is reproduced by M magnetic head groups for reproduction having a head width wider than a track pitch width which is a distance between an oblique track and an adjacent track recorded on a magnetic tape. 9. The VTR for high speed editing according to claim 8, wherein. 14. A VTR for high speed editing according to claim 12, wherein the M magnetic head groups for reproduction and the M magnetic head groups for erasing are shared. 15. A rotational speed N [rpm] having a lead angle of θ [°] with respect to a magnetic tape to which video / audio data having a data rate R [bps] is sent at a tape feeding speed X [mm / s]. VTR for digitally recording on diagonal tracks of a magnetic tape by a magnetic head arranged on a rotating cylinder of
A VTR for high-speed editing for high-speed editing of video / audio data recorded by using a magnetic tape feed speed of M1, M2, X [mm / s] (both M1 and M2 are 2 or more). Integer) or X [mm / s], so that the magnetic head traces on the diagonal track on the magnetic tape when the magnetic tape feed speed is M1, M2, X [mm / s]. Approximately 180 [°] on a rotating cylinder with a rotation angle of M1 · N [rpm] having a lead angle of θ1 [°] (θ1 is a value different from θ).
And a data recording / reproducing section in which at least one M2 magnetic head group facing each other is arranged, and the tape feeding speed is set to M1, M2, X [mm / s] during high speed reproduction, and the digital V
Video / audio data of M2 system data rate M1R [bps] is reproduced from the magnetic tape on which video / audio data is recorded by TR through the magnetic head group of M2 sets, and the tape feed speed is X [during normal reproduction. mm / s], and a reproduction signal for one track of one system is synthesized from a reproduction signal traced M1 times on the magnetic tape of M2 system from the magnetic head group of M2 group, and the image of data rate R [bps] / Playback signal processing unit to play back audio data and tape feed speed M1 · M2 · X [mm / s] during high-speed recording, M2 magnetic head group M2 data rate M1 · R [ bp
[s] video / audio data is recorded by a recording signal processing unit. 16. The VTR for high speed editing according to claim 15, wherein M1 = M2 = 2. 17. The VT for high speed editing according to claim 15, wherein only M2 magnetic head groups for performing both reproduction and recording are arranged on the rotary cylinder.
R. 18. A VTR for high-speed editing according to claim 15, wherein M2 magnetic head groups for reproduction and M2 magnetic head groups for recording are arranged on the rotary cylinder. . 19. A rotary cylinder for erasing recorded data on a track prior to a reproducing M2 magnetic head group, a recording M2 magnetic head group and a recording magnetic head. 16. The high-speed editing V according to claim 15, wherein M2 magnetic head groups for erasing are arranged.
TR. 20. Video / audio data is reproduced by M2 sets of magnetic head groups for reproduction having a head width wider than a track pitch width which is a space between an oblique track and an adjacent track recorded on a magnetic tape. 16. The VTR for high speed editing according to claim 15, wherein: 21. The high-speed editing VTR according to claim 19, wherein the reproducing M2 magnetic head group and the erasing M2 magnetic head group are shared.