JP2001184605A - Device and method for recording information, device and method for reproducing information, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform recording/reproducing on an SDL mode based on a digital 8 mm system in the head specifications of an SD mode. SOLUTION: A valid wrapping angle is selected to be 87 deg. equal to a winding angle on the rotary drum of a sub-track on an SD mode. During SDL mode recording, by the first 1/2 rotation of the rotary drum, the recording of a lower track LowerTr is carried out by one magnetic head, and by next 1/2 rotation, the recording of a next lower track LowerTr is carried out by the other magnetic head. Thus, in the head specifications of the SD mode, recording/ reproducing is performed on the SDL mode based on a digital 8 mm system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording apparatus and method, an information reproducing apparatus and method, and a recording medium.
TECHNICAL FIELD The present invention relates to an information recording apparatus and method, an information reproducing apparatus and method, and a recording medium that can perform recording or reproduction in a long time mode by a system.

[0002]

2. Description of the Related Art Recently, a video tape recorder (VTR) for recording television broadcasts and the like has become widespread. Since television broadcasting is about to be switched from conventional analog broadcasting to digital broadcasting, a digital recording tape recorder (DVTR: Digital Video Tape Recorder) of a digital recording system capable of recording digital broadcasting has been accompanied accordingly. Spreading. As a recording method of DVTR, DV (Digital Vide
o) There is a method, and a digital broadcast signal can be digitally recorded as it is, so that reproduction with high characteristics can be enjoyed without deterioration in image quality and sound quality.

Meanwhile, the tape width of a magnetic tape used in the DV system (hereinafter referred to as a DV tape) is 6.35 mm.
This is smaller than the tape width (8 mm) of a magnetic tape (8 mm video tape) used in an analog 8 mm system used as a conventional VTR recording system. However, in the DV system, since a video signal and an audio signal are compressed and the recording density is increased, long-time recording with high image quality can be performed.

[0004] Therefore, if a video signal and an audio signal in the data format of the DV system can be recorded on the 8 mm video tape, the recording can be performed for a longer time than the DV tape.

The applicant of the present invention has disclosed, for example, Japanese Patent Application No. 10-357.
No. 737 has previously proposed recording data on an 8 mm video tape in a DV format (hereinafter, referred to as a digital 8 mm format).

According to this principle, the normal mode (SD (Stan)
FIG. 1 shows a case where data is recorded in the digital 8 mm system at the tape running speed in the dard definition mode). That is, the 8 mm video tape 1 is mounted on a digital 8 mm DVTR, the rotating drum is rotated, and two magnetic heads having different azimuth angles mounted at positions 180 ° opposite to the rotating drum are mounted on the 8 mm video tape 1. Are alternately traced to form a track.

In the digital 8 mm system, data of two tracks in the DV system (so-called DV data) is continuously recorded on one track of the 8 mm video tape 1 in a data pattern of the DV system. .

[0008] For example, in FIG. 1, (as one track) the DV data of the odd track A ₁ and even track B ₁ in the one set in the DV system, one magnetic head (for example, (+) azimuth heads ). Then, in the next track, and DV data of the odd track A ₂ and even tracks B ₂ is the one set in the DV system, the other magnetic head (e.g., (-) azimuth heads) are continuously recorded by . Hereinafter, similarly, DV data of two consecutive tracks in the DV format are sequentially recorded as one track.

Therefore, in the digital 8 mm system, in the SD mode, the DV data for one frame is stored on the 8 mm video tape 1 in the PAL (Phase Alfernation by Line) system.
Recorded on separate tracks, NTSC (National Telev.
In the ision system committee) system, the data is recorded in five tracks (in the example of FIG. 1, the data is recorded in the PAL system).

FIG. 2 shows a reproduced waveform of data recorded in the digital 8 mm system in the SD mode. In the figure, a switching pulse (SWP: Switching Pulse) is a switching signal for switching a magnetic head to be used.
When the switching pulse is Hi, a (+) azimuth head is used, and when the switching pulse is Low, a (-) azimuth head is used. That is, when the reproduction of the data within the effective wrap angle by one magnetic head ends, the switching pulse is switched, and the data within the effective wrap angle of the other magnetic head is reproduced. Thus, in the SD mode, reproduction of two tracks is performed for one rotation of the drum.

[0011]

By the way, in the DVTR, the same operation as the conventional VTR can be performed.
In addition to the D mode, a long time mode (SDL (Standard Definition Long)) with half the tape running speed of this SD mode
Mode) can be used.

In order to realize the SDL mode in the DVTR of the digital 8 mm system, the tape running speed in the SDL mode is set to 1/2 of that in the SD mode as in the conventional case. At this time, data for one frame is recorded on three tracks, which are half of the SD mode in the PAL system (2.5 tracks in the NTSC system).

However, in order to execute the SDL mode by setting the running speed of the magnetic tape to half of that in the SD mode, it is necessary to add a dedicated magnetic head. As a result, there is a problem that not only the configuration becomes complicated, but also the cost increases and the productivity of the rotary drum deteriorates.

The present invention has been made in view of such a situation, and enables recording or reproduction in the SDL mode by the digital 8 mm system without switching the running speed of the rotating drum and the magnetic tape. Thus, the configuration can be simplified and a low-cost device can be realized.

[0015]

An information recording apparatus according to claim 1, wherein a selecting means for selecting a data recording type;
Recording control means for controlling data to be recorded on one of an upper track and a lower track of the magnetic tape when the magnetic head traces the magnetic tape once based on the recording type selected by the selecting means. It is characterized by having.

The recording type is a first type in which the direction in which the magnetic tape runs is the same in a case where recording is performed on the upper track of the magnetic tape and a case in which recording is performed on the lower track, or the first type in which the direction is reversed. There can be two types.

According to a third aspect of the present invention, there is provided the information recording method, wherein the magnetic head traces the magnetic tape once based on the selecting step of selecting a data recording type and the recording type selected by the selecting step. A recording control step of controlling data to be recorded on one of the upper track and the lower track of the magnetic tape.

According to a fourth aspect of the present invention, there is provided a program recorded on a recording medium, comprising: a selecting step of selecting a recording type of data; and a magnetic head for reading the magnetic tape based on the recording type selected by the processing of the selecting step. When tracing once, a recording control step of controlling data to be recorded on one of an upper track and a lower track of the magnetic tape is included.

According to a fifth aspect of the present invention, there is provided an information reproducing apparatus, comprising: detecting means for detecting an upper track number and a lower track number of a magnetic tape; and determining a data recording type based on a detection result of the detecting means. And a magnetic head for moving the magnetic tape by one based on the judgment result of the judgment means.
And a reproduction control means for controlling to reproduce data recorded on one of the upper track and the lower track of the magnetic tape when performing the round tracing.

If the number of the upper track and the number of the lower track of the magnetic tape are the same, the determining means determines that the magnetic tape is of the first type. If the numbers are different, it determines that the magnetic tape is of the second type. Can be done.

According to a seventh aspect of the present invention, there is provided an information reproducing method, comprising: a detecting step of detecting an upper track number and a lower track number of a magnetic tape; and a data recording type based on a detection result in the detecting step. When the magnetic head traces the magnetic tape once based on the determination result in the determining step and the determining step, the data recorded on one of the upper track and the lower track of the magnetic tape is reproduced. And a reproduction control step of performing the control.

A program recorded on the recording medium according to claim 8 includes a detecting step of detecting an upper track number and a lower track number of a magnetic tape;
A determining step of determining the data recording type based on the detection result of the detecting step; and, based on the determination result of the determining step, when the magnetic head traces the magnetic tape once, the upper track of the magnetic tape or A reproduction control step of controlling to reproduce data recorded on one of the lower tracks.

[0023] The information recording apparatus according to claim 1, and claim 3.
In the information recording method described in the item (1) and the program recorded on the recording medium according to the item (4), a data recording type is selected, and based on the selected recording type, the magnetic head performs one time on the magnetic tape. When tracing,
Data is recorded on one of the upper track and the lower track of the magnetic tape.

An information reproducing apparatus according to claim 5, wherein
And the program recorded on the recording medium according to claim 8, wherein the number of the upper track and the number of the lower track of the magnetic tape are detected, and based on the detection result, the data is read. When the magnetic head traces the magnetic tape once based on the result of the determination, data recorded on one of the upper track and the lower track of the magnetic tape is reproduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a digital 8 mm according to the present invention will be described.
An embodiment of a system DVTR will be described with reference to the drawings. First, the principle of the present invention in the case where recording is performed by the digital 8 mm system in the SDL mode will be described with reference to FIG.

In the present invention, in the SDL mode, when the magnetic head traces once on the 8 mm video tape 1 as shown in FIG. 4, data is recorded only on one of the lower track and the upper track. . That is, in the lower track of the 8mm video tape 1, from the tape top to the tape end (toward the forward direction), the odd track A ₂₁ is recorded by one magnetic head, even track B ₂₁ and the other magnetic head Recorded by Hereinafter, similarly, odd track A in the DV system
_{22 to} A ₂₅ and even tracks B _{22 to} B ₂₄ are alternately recorded by the magnetic head. Also, 8mm video tape 1
In the upper track, toward the tape end on the tape top (toward the reverse direction), an odd track A ₃₁ to A ₃₅ in the DV system, and even track B ₃₁ to B ₃₄ is recorded by the magnetic head alternately You.

Note that both the upper track and the lower track move from the tape top toward the tape end.
That is, in the forward direction, the odd track A _i and the even track B _i (i = 0, 1, 2,
3) can be alternately recorded by a magnetic head.

By the way, each track has a so-called ATF
A tracking pilot signal called an (Automatic Track Finding) signal is multiplex-recorded. As this pilot signal, signals of three frequencies f0, f1, f2 are prepared, and f0, f1, f0, f2, f0.
.. Are recorded on each track repeatedly. As will be described later, the reproducing circuit detects an ATF signal from the reproduced signal, generates an ATF error signal corresponding to a tracking error signal from the detected ATF signal, performs speed control of a capstan motor, and performs ATF servo control. Tracking is realized.

In the example of FIG. 4, in the lower track,
Odd track A_{twenty one}, A_{twenty two}, A_{twenty three}, A _{twenty four}, A_{twenty five}Has a frequency
The ATF signal of f0 is recorded and even track B_{twenty one}, B_{twenty three}To
Is an ATF signal of frequency f1, recorded on even track
B_{twenty two}, B_{twenty four}Records an ATF signal of frequency f2. Ma
In the upper track, odd track A₃₁,
A₃₂, A ₃₃, A₃₄, A₃₅Contains the ATF signal of frequency f0.
Recorded, even track B₃₁, B₃₃ATF of frequency f1
The signal is recorded and the even track B₃₂, B₃₄Has the frequency f
2 ATF signals are recorded.

Next, with reference to FIGS. 5 to 8, a description will be given of a digital 8 mm DVTR specification in the SD mode and a digital 8 mm DVTR specification in the SDL mode to which the present invention is applied.

In the SD mode, the drum diameter is 40 mm, the number of revolutions of the drum is 75 Hz, the effective lap angle is 177 °, the track pitch is 16.34 μm, and the tape running speed is 28.
695 mm / sec, drum lead angle θs 4.885 °,
The track recording angle θr is 4.8999 °, the track start height is 1.786 mm, and the track end height is 7.04
7 mm. Further, one azimuth angle of the magnetic head is + 10 °, and the other azimuth angle is −10 °.

FIG. 6 shows a recording format of the digital 8 mm system in the SD mode based on these specifications. As can be seen from this figure, in the digital 8 mm system in the SD mode, the effective wrap angle is selected to be 177 °. A gap of 3 ° (ITG: I
nter Track Gap) and two sub-tracks SubTr #
0, SubTr # 1 are provided.

Each of the sub-tracks SubTr # 0 and SubTr # 1 has a wrapping angle with respect to the rotating drum of 87 °, and data of one track in the DV format is recorded in the DV format. .

Returning to FIG. 5, in the SDL mode to which the present invention is applied, the diameter of the drum is 40 mm and the number of rotations of the drum is 75.
Hz, the effective lap angle is 87 °, the track pitch during forward running is 16.34 μm, the track pitch during reverse running is 16.24 μm, and the tape running speed is 28.69.
5 mm / sec, the drum lead angle θs is 4.885 °, the track recording angle θr during forward running is 4.8999 °,
Track recording angle θr during reverse running is 4.8702
°, the track starting height of the upper track is 4.461 mm,
The track start height of the lower track is 1.786 mm, the track end height of the upper track is 7.047 mm, and the track end height of the lower track is 4.372 mm. Also, one azimuth angle of the magnetic head is + 10 °,
The other azimuth angle is -10 °.

FIG. 7 shows a recording format of the digital 8 mm system in the SDL mode based on these specifications. This figure shows a format of a type in which data is recorded in both the upper track and the lower track in the forward direction (hereinafter, this recording format is referred to as type 1). The effective wrap angle is set to 87 ° which is the same as the winding angle of the sub-tracks SubTr # 0 and SubTr # 1 around the rotating drum in the SD mode. Within this effective lap angle, the lower track LowerTr or the upper track Upper
Tr is formed respectively.

In the lower track LowerTr or the upper track UpperTr, data for one track in the DV system is recorded in the data format of the DV system.

FIG. 8 shows the digital 8m in the SDL mode.
13 shows another example of an m-format recording format. This figure shows a format in which data is recorded in the forward direction on the lower track and data is recorded in the reverse direction on the upper track (hereinafter, this recording format is referred to as type 2).

FIG. 9 shows the effective wrap angle of the 8 mm video tape 1 with respect to the rotating drum 11. In the case of the SDL mode, when recording the lower track LowerTr, the left 87 ° range in the figure is used, and when recording the upper track UpperTr, the right 87 ° range in the figure is used. SD
In the case of the mode, a range of 177 ° (= 87 + 3 + 87) is used.

FIG. 10 shows the mounting position of the magnetic head on the rotating drum 11. In order to make the gap angle (azimuth angle) of the head easy to understand,
A head with an angle in the forward direction is shown with a (+) after the sign, and a head with an angle in the reverse direction is shown with a (-) after the sign.

The rotary drum 11 is provided with azimuth heads (magnetic heads 12-1 and 12-2) having different polarities at opposing positions separated from each other by 180 °. Also, at a substantially intermediate position between the magnetic heads 12-1 and 12-2,
A FE (flying erase) head 13 is attached.

In this configuration example, as described above, in the SDL mode, the first half rotation of the rotating drum 11 (the angle at which recording is actually performed is 87 ° thereof) and the one magnetic head 12 By -1, one track (for example, the odd track A _{21 in} FIG. 4) in the DV system is recorded, and the next half turn (the angle at which recording is actually performed is 87 ° thereof) is performed on the other side. Of the magnetic head 12-2
One track (for example, even track B _{21 in} FIG. 4) in the DV system is recorded.

In the SD mode, in the first half rotation,
Tracks 2 duty in the DV system by one magnetic head 12-1 (e.g., odd track A ₁ and even track B ₁ 1) is recorded, in the next half rotation, the other of the magnetic head 12 two pins of tracks in the DV system by 2 (e.g., an odd track a ₂ and even track B ₂ in FIG. 1) is recorded.

Next, an example of the configuration of a camera-integrated digital 8 mm DVTR to which the present invention is applied will be described with reference to FIG.

The input unit 21 is operated by the user, and
One of the operation modes, the recording mode or the reproduction mode, is selected, and a mode selection signal S1 corresponding to the operation is input to the system controller 22. The mode transition unit 41 of the system controller 22 generates an operation mode designation signal S2 in response to the mode selection signal S1 input from the input unit 21, and supplies the operation mode designation signal S2 to the digital 8 mm mechanical servo controller 23.

Based on the operation mode designating signal S 2 supplied from the mode transition unit 41, the digital 8 mm mechanical servo controller 23 outputs the digital 8 mm signal processing unit 24.
And the motor control unit 29 is controlled. The mechanical servo controller 23 for digital 8 mm also switches the switching pulse (SW) based on the operation designation signal S2.
P) is output to the head driver 28.

The imaging unit 25 includes, for example, a lens system and a CC.
D (Charge Coupled Device) and the like, and the analog imaging signal S3 is supplied to the digital 8 mm signal processing unit 24.
The microphone (not shown) supplies the analog audio signal S4 to the digital 8 mm signal processing unit 24 via the audio input / output terminal 27.

The digital 8 mm signal processing unit 24 converts the supplied image signal S 3 and audio signal S 4 into A / D (A
(nalog to digital) conversion processing, encoding processing, error correction processing, ATF signal superimposition processing, and recording signal processing according to the DV system such as modulation processing. (Described as data) and outputs it to the head driver 28.

The digital 8 mm signal processing section 24 also performs demodulation processing, error correction processing, decoding processing, and D / A processing on the reproduced DV data supplied from the head driver 28.
A predetermined reproduction signal process according to the DV system such as a conversion process is performed to generate a video signal, output to the outside via the video output terminal 26 as a reproduction video signal S5, and convert an audio signal into a reproduction audio signal S6. Output to the outside via the input / output terminal 27.

Further, the digital 8 mm signal processing unit 24
Extracts the ATF signal S7 superimposed on the reproduced DV data and supplies it to the digital 8 mm mechanical servo controller 23. Mechanical servo controller for digital 8mm 23
Performs tracking control by controlling the rotation speed of the capstan motor 30 via the motor control unit 29 based on the ATF signal S7.

The head driver 28 controls the magnetic heads 12-1 and 12-1 based on the switching pulse (SWP) supplied from the digital 8 mm mechanical servo controller 23.
The 2-2 supplies the multiplexed signal of the DV data and the ATF signal to the magnetic heads 12-1 and 12-2 at the timing of tracing on the 8 mm video tape 1. The head driver 28 also reads the DV data reproduced by the magnetic heads 12-1 and 12-2, supplies the read DV data to the digital 8 mm signal processing unit 24, and sends the DV data to the detection unit 51 of the digital 8 mm mechanical servo controller 23. Supply.

The rotary drum 11 is provided with two magnetic heads 12-1 and 12-2 having different azimuth angles at positions facing each other by 180 ° (FIG. 10). These two magnetic heads 12-1 and 12-2 record the supplied DV data and ATF signal on the 8 mm video tape 1, and
The DV data recorded on the 8 mm video tape 1 is reproduced.

The detecting section 51 detects an absolute track number from the DV data supplied from the head driver 28 and supplies it to the determining section 42 of the system controller 22. The determination unit 42 determines the recording format of the DV data from the absolute track number supplied from the detection unit 51, and supplies a control signal to the digital 8 mm mechanical servo controller 23 based on the determination result (DV A specific example of a method for determining the data recording format will be described later.

The motor control unit 29 controls the capstan motor 30 and the drum motor 3 based on the control signal supplied from the digital 8 mm mechanical servo controller 23.
Control 1 The capstan motor 30 drives (rotates) the capstan 30a (FIG. 12) based on the control signal supplied from the motor control unit 30. The drum motor 31 rotates the rotating drum 11 at a predetermined rotation speed based on a control signal supplied from the motor control unit 29. As a result, the 8 mm video tape 1 loaded on the rotating drum 11 runs at a predetermined tape running speed, and data is recorded or reproduced.

The drive 32 can mount a magnetic disk 61, an optical disk 62, a magneto-optical disk 63, a semiconductor memory 64, or the like.

Next, the reproduction system of the digital 8 mm system DVTR shown in FIG. 11 will be described in more detail with reference to the block diagram of FIG.

An RF (Radio Frequency) signal read from the 8 mm video tape 1 by the magnetic heads 12-1 and 12-2 attached to the rotating drum 11 is supplied to a digital 8 mm signal via a switch 74 of the head driver 28. The signal is supplied to the RF regeneration amplifier 73 of the processing unit 24. Switch 74 is a mechanical servo controller 2 for digital 8mm
When data is reproduced by the magnetic head 12-1 based on the switching pulse (SWP) supplied from the terminal 3
Is switched to select the terminal b when reproducing data with the magnetic head 12-2.

The RF reproducing amplifier 73 is input from the magnetic head 12-1 or 12-2 via the switch 74.
The RF signal is amplified and the reproduction data storage memory 72 and the ATF
Supply to circuit 75. The reproduction data storage memory 72
The data supplied from the reproduction amplifier 73 is stored. The data stored in the reproduction data storage memory 72 further includes
The video signal and the audio signal are supplied to the reproduction video generation circuit 71, where the video signal and the audio signal are output to the outside.

The ATF circuit 75 extracts an ATF signal from the RF signal supplied from the RF reproduction amplifier 73, and outputs an ATF error signal to the digital 8 mm mechanical servo controller 23. Mechanical servo controller for digital 8mm 23
Performs tracking control by controlling the rotation speed of the capstan motor 30 via the motor control unit 29 based on the input ATF error signal.

The mechanical servo controller 23 for digital 8 mm also includes a capstan FG of the capstan motor 30.
(Frequency Generator) signal is received as an input signal, and the motor control unit 29 is controlled so that the running speed of the 8 mm video tape 1 becomes a predetermined speed. Thereby, the motor control unit 29 can control the capstan motor 30 to rotate at a predetermined rotation speed.

The mechanical servo controller 23 for digital 8 mm further outputs a PG (Pulse) output from the drum motor 31.
In addition, a switching pulse is generated on the basis of the output signal of the drum motor 31 to control the switch 74, and the rotation of the drum motor 31 is controlled via the motor control unit 29 on the basis of the drum FG.

Next, the recording process of the digital 8 mm system in the SDL mode will be described with reference to the flowchart of FIG. This processing is started when the user operates the input unit 21 and issues a command to perform recording in the digital 8 mm system in the SDL mode.

In step S1, the system controller 22 determines whether or not the recording format specified by the user is type 1 (FIG. 7) for recording DV data in the forward direction for both the upper track and the lower track. If it is determined that both the upper track and the lower track are of type 1 for recording in the forward direction, the process proceeds to step S2.

In step S2, the mode transition section 41 of the system controller 22 supplies an operation mode designation signal S2 to the digital 8 mm mechanical servo controller 23 based on the command input from the input section 21. The digital 8 mm mechanical servo controller 23 controls the digital 8 mm signal processing unit 24 and the motor control unit 29 based on the operation mode designating signal S2, and
1 and rotate the 8 mm video tape 1 in the forward direction. At this time, the mechanical servo controller 23 for digital 8 mm switches the switching pulse (SW
P) is output to the head driver 28 (switch 74).

Then, the digital 8 mm signal processing unit 24
Performs predetermined processing on the video signal and the audio signal to be recorded, and outputs the processed signal to the head driver 28. The head driver 28 supplies the superimposed signal of the DV data and the ATF signal to the magnetic heads 12-1 and 12-2 at a predetermined timing, and records them on the upper track and the lower track of the 8 mm video tape 1, respectively. Thus, data is recorded on both the upper track UpperTr and the lower track LowerTr in FIG.

At this time, the magnetic heads 12-1 and 12-2
Records the absolute track number simultaneously in the tape running direction. That is, for both the upper track and the lower track, 0, 0,
The absolute track numbers are recorded in the order of 1, 2, 3,.

In step S3, the digital 8 mm mechanical servo controller 23 determines whether or not the current position of the 8 mm video tape 1 is at the end of the tape. Notify the system controller 22. System controller 22
Terminates the recording operation at this time.

If it is determined in step S3 that the current position of the 8 mm video tape 1 is not at the end of the tape, the flow advances to step S4 to proceed to step S4.
Determines whether or not the end of data recording has been instructed, that is, whether or not a stop command has been input by the user via the input unit 21, and if it has been determined that the end of recording has not been instructed, Returning to step S2, the above-mentioned subsequent processing is repeated.

If it is determined in step S1 that the recording format specified by the user is not Type 1 for recording DV data in the forward direction for both the upper track and the lower track,
If the recording format specified by the user is such that the lower track records DV data in the forward direction, the upper track records DV data in the reverse direction (or the upper track records DV data in the forward direction, and the lower track records DV data in the reverse direction). If the type is determined to be type 2 (FIG. 8), the process proceeds to step S5.

In step S5, the digital 8 mm mechanical servo controller 23 controls the capstan motor 30 via the motor control unit 29 to cause the 8 mm video tape 1 to run in the reverse direction. The digital 8 mm signal processing unit 24 performs predetermined processing on the video signal and the audio signal to be recorded, and outputs the processed signal to the head driver 28.
The head driver 28 supplies the superimposed signal of the DV data and the ATF signal to the magnetic heads 12-1 and 12-2 at a predetermined timing, and supplies the superposed signal to the lower track of the 8 mm video tape 1.
Record. As a result, the lower track LowerTr in FIG.
The data is recorded in.

At this time, as described above, the magnetic head 1
2-1 and 12-2 simultaneously record absolute track numbers in the tape running direction. That is, 0, 1, 2, 3 from the tape top of the lower track toward the tape end.
Are recorded in the order of...

In step S6, the digital 8 mm mechanical servo controller 23 determines whether or not the current position of the 8 mm video tape 1 is at the tape end. If it is determined that the current position is not at the tape end, the process proceeds to step S7. Proceeding, the system controller 22 determines whether or not a command to end the data recording has been issued, that is, whether or not a stop command has been input from the user via the input unit 21.
If it is determined that the end of the recording has not been instructed, the process returns to step S5, and the above-mentioned subsequent processes are repeated.

If it is determined in step S6 that the current position of the 8 mm video tape 1 is at the tape end, the process proceeds to step S8, where the digital 8 mm mechanical servo controller 23 rotates the capstan motor 30 in the reverse direction. Then, the 8 mm video tape 1 is run in the reverse direction. The head driver 28 supplies the superimposed signal of the DV data and the ATF signal to the magnetic heads 12-1 and 12-2 at a predetermined timing, and causes the magnetic heads 12-1 and 12-2 to record the signals on the upper track of the 8 mm video tape 1. As a result, the upper track Up in FIG.
Data is recorded in perTr.

At this time, the magnetic heads 12-1 and 12-2
Records the absolute track number inherited from the lower track number in the tape running direction. For example, if the absolute track number recorded on the tape end of the lower track is 100, the absolute track number recorded on the tape end of the upper track (the first track in the upper track) is one. The number 101 is incremented, and then 102, 103, 104,... From the tape end to the tape top in the reverse direction.
It is recorded in the order of.

In step S9, the system controller 22 determines whether or not a command to end the data recording has been issued, that is, whether or not a stop command has been input from the user via the input unit 21. If it is determined that has not been commanded, the process returns to step S8, and the above-described subsequent processes are repeated.

If it is determined in step S4, S7, or S9 that the end of data recording has been instructed, the process ends.

Next, referring to the flowchart of FIG. 14, the DV recorded in the digital 8 mm system in the SDL mode will be described.
Data (DV recorded according to the flowchart of FIG. 13)
The data reproduction process will be described. This processing is started when the user operates the input unit 21 and issues a command to perform reproduction.

In step S 21, the digital 8 mm mechanical servo controller 23 controls the motor controller 29 under the control of the system controller 22 to
Videotape 1 is run in the forward direction on a trial basis,
Play the track. The detecting unit 51 includes the magnetic head 12
-1, 12-2, the head driver 28, and the reproduced DV data from the 8 mm video tape 1 supplied via the digital 8 mm signal processing unit 24 are monitored, and the absolute track numbers of the upper track and the lower track are determined. Each is detected, and the detection result is supplied to the determination unit 42.

In step S22, the judgment section 42
Whether the absolute track number of the upper track detected in step S21 is the same as the absolute track number of the lower track, that is, the type 1 DV recorded in the forward direction for both the upper track and the lower track
It is determined whether or not the data is data, and if it is determined that the absolute track number is the same for both the upper track and the lower track, the process proceeds to step S23.

In step S23, the digital 8 mm mechanical servo controller 23 controls the motor control unit 29 to cause the 8 mm video tape 1 to travel in the forward direction as it is. The magnetic heads 12-1 and 12-2 are 8 mm
The DV data recorded on the upper track and the lower track of the video tape 1 are reproduced.

In step S24, the mechanical servo controller 23 for digital 8 mm uses the 8 mm video tape 1
Judge whether the current position of is the tape end,
If it is determined that the end of the tape is reached, the system controller 22 is notified of this. At this time, the system controller 22 ends the reproduction operation.

If it is determined in step S24 that the current position of the 8 mm video tape 1 is not at the end of the tape, the process proceeds to step S25, where the system controller 2
2 determines whether or not the end of data reproduction has been instructed, that is, whether or not a stop command has been input from the user via the input unit 21 and determines that the end of data reproduction has not been instructed If so, the process returns to step S23, and the subsequent processes described above are repeated.

If it is determined in step S22 that the absolute track number of the upper track detected in step S21 does not match the absolute track number of the lower track, that is, the lower track is in the forward direction, Type 2 DV recorded in the reverse direction (or recorded in the forward direction on the upper track and in the reverse direction on the lower track)
If it is determined that the data is data, the process proceeds to step S26.

In step S26, the 8 mm video tape 1 is moved in the forward direction, and
1, 12-2 reproduces DV data recorded on the lower track of the 8 mm video tape 1. Step S27
, Digital 8mm mechanical servo controller 2
3 determines whether or not the current position of the 8 mm video tape 1 is at the end of the tape. If it is determined that the current position is not at the end of the tape, the process proceeds to step S28, where the system controller 22 instructs the end of the data reproduction. Whether it was done
That is, it is determined whether or not a stop command has been input by the user via the input unit 21. If it is determined that the end of data reproduction has not been instructed, the process returns to step S26, and the above-described subsequent processing is repeated. .

If it is determined in step S27 that the current position of the 8 mm video tape 1 is at the tape end, in step S29, the 8 mm video tape 1 is moved in the reverse direction. Magnetic heads 12-1, 12-
Numeral 2 reproduces the DV data recorded on the upper track of the 8 mm video tape 1. In step S30,
The system controller 22 determines whether or not the end of the data reproduction has been instructed, that is, whether or not a stop command has been input from the user via the input unit 21, and the end of the data reproduction has not been instructed. When the determination is made, the process returns to step S29, and the above-described processing is repeated.

If it is determined in step S25, S28, or S30 that termination of data reproduction has been instructed, the processing is terminated.

In order to maintain the continuity of the reproduction data,
Immediately before switching from the lower track to the upper track, the data of the upper track may be accumulated in the memory and may be overlapped.

FIG. 15 shows a reproduced waveform of data at the time of reproduction in the forward direction in step S26. As can be seen from this figure, the playback timing of the digital 8 mm system in the SDL mode is the same as that in the SD mode except that the playback from the track on one stage (the upper stage in this example) is substantially prohibited. (The reproduction of two tracks is performed for one rotation of the drum) (FIG. 2).

As described above, for example, assuming that 150 tracks are formed in one second in the SD mode recording on the 8 mm video tape 1 by the digital 8 mm system, the SD tape is recorded in the SDL mode recording to which the present invention is applied. Similarly to the mode, 150 tracks are formed on the upper track or the lower track of the 8 mm video tape 1. Therefore, it is possible to easily perform the recording or reproduction of the digital 8 mm system in the SDL mode with the specifications of the head in the SD mode.

The software that executes the above-described series of processes executes various functions by installing a computer in which the program constituting the software is built in dedicated hardware or installing various programs. For example, it is installed from a recording medium to a general-purpose personal computer or the like.

This recording medium, as shown in FIG.
Not only the system controller 22 in which the program is recorded and provided to the user in a state in which it is incorporated in the TR in advance, but also a program which is distributed to provide the user with the program separately from the DVTR is recorded. Magnetic disk 61 (including floppy disk), optical disk 6
2 (CD-ROM (Compact Disc-Read Only Memory), DV
D (including Digital Versatile Disc), a magneto-optical disk 63 (including MD), or a package medium including a semiconductor memory 64 or the like.

In this specification, the step of describing a program recorded on a recording medium may be performed not only in a chronological order but also in a chronological order according to the described order. This also includes processing executed in parallel or individually.

[0092]

As described above, according to the information recording apparatus according to the first aspect, the information recording method according to the third aspect, and the program recorded on the recording medium according to the fourth aspect, When the magnetic head traces the magnetic tape once based on the selected recording type, the data is recorded on one of the upper track and the lower track of the magnetic tape. It is possible to perform long-time recording without providing a magnetic head dedicated to long-time recording, and it is possible to realize a simple configuration and low-cost information recording device.

According to the information reproducing apparatus of claim 5, the information reproducing method of claim 7, and the program recorded on the recording medium of claim 8, the upper track of the magnetic tape The number of the lower track and the number of the lower track are detected, and the data recording type is determined based on the detection result. When the magnetic head traces the magnetic tape once based on the determination result, the upper track of the magnetic tape is determined. Alternatively, data recorded on one of the lower tracks is reproduced, so long-time reproduction is possible with a simple configuration and low-cost information reproducing device without a magnetic head dedicated to long-time reproduction. Becomes

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a recording pattern recorded in a digital 8 mm system in an SD mode.

FIG. 2 is a diagram illustrating a reproduced waveform of data recorded in a digital 8 mm system in an SD mode.

FIG. 3 is a diagram illustrating a recording pattern recorded in a digital 8 mm system in an SDL mode.

FIG. 4 is a diagram illustrating the principle of a recording pattern according to the present invention.

Fig. 5 Digital 8mm in SD mode or SDL mode
It is a figure explaining the specification of a system.

FIG. 6 is a diagram illustrating a digital 8 mm recording format in the SD mode.

FIG. 7 is a diagram illustrating a recording format of the digital 8 mm system in the SDL mode.

FIG. 8 is a diagram illustrating a recording format of another example of the digital 8 mm system in the SDL mode.

FIG. 9 is a diagram illustrating an effective lap angle in the SDL mode to which the present invention has been applied.

FIG. 10 is a diagram illustrating a configuration of a rotating drum 11 to which the present invention is applied.

FIG. 11 is a block diagram showing a configuration of a DVTR to which the present invention is applied.

FIG. 12 is a block diagram showing a more detailed configuration of a reproduction system of the DVTR of FIG. 11;

FIG. 13 is a flowchart illustrating a recording process.

FIG. 14 is a flowchart illustrating a reproduction process.

FIG. 15 is a diagram illustrating a reproduced waveform of data recorded in a digital 8 mm system in the SDL mode to which the present invention is applied.

[Explanation of symbols]

18mm video tape, 11 rotating drums, 12-
1,12-2 magnetic head, 13 FE head, 22
System controller, 23 digital 8mm mechanical servo controller, 24 digital 8mm signal processing unit, 28 head driver, 29 motor control unit,
30 capstan motor, 30a capstan, 31 drum motor, 32 drive, 42
Discriminator, 51 detector, 61 magnetic disk,
62 optical disk, 63 magneto-optical disk, 64
Semiconductor memory, 71 playback video generation circuit, 72 playback data storage memory, 73 RF playback amplifier, 74
Switch, 75 ATF circuit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiro Kiko 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D031 AA03 EE03 EE07 HH01 HH20 5D044 AB07 BC01 CC03 DE04 5D091 AA05 BB04 CC01 GG18 GG27 HH20

Claims (8)

[Claims] 1. An information recording apparatus for recording data on a mounted magnetic tape in a long time mode by a magnetic head, wherein: a selection unit for selecting the data recording type; When the magnetic head traces the magnetic tape once based on the recording type, the magnetic head includes recording control means for controlling the data to be recorded on one of an upper track and a lower track of the magnetic tape. An information recording device, characterized in that: 2. The recording type is a first type in which the direction in which the magnetic tape travels is the same in a case where recording is performed on an upper track of the magnetic tape and in a case where recording is performed on a lower track. 2. The information recording apparatus according to claim 1, wherein the information recording apparatus is a second type of direction. 3. An information recording method for an information recording apparatus for recording data on a mounted magnetic tape in a long time mode by a magnetic head, wherein: a selecting step of selecting the data recording type; When the magnetic head traces the magnetic tape once based on the recording type selected by the processing of step (a), control is performed so that the data is recorded on one of an upper track and a lower track of the magnetic tape. And a recording control step. 4. A program for controlling an information recording apparatus for recording data on a mounted magnetic tape for a long time by a magnetic head, comprising: a selection step of selecting the data recording type; When the magnetic head traces the magnetic tape once based on the recording type selected by the processing, the recording is controlled to record the data on one of an upper track and a lower track of the magnetic tape. And a control step. A recording medium on which a computer-readable program is recorded. 5. An information reproducing apparatus for reproducing data recorded on a mounted magnetic tape in a long time mode by a magnetic head, wherein a detection is performed by detecting an upper track number and a lower track number of the magnetic tape. Means, determining means for determining the recording type of the data based on the detection result of the detecting means, based on the determination result of the determining means, when the magnetic head traces the magnetic tape once, An information reproducing apparatus, comprising: a reproduction control unit that controls the data recorded on one of an upper track and a lower track of a magnetic tape to be reproduced. 6. The determination means determines that the magnetic tape is of the first type when the number of the upper track and the number of the lower track are the same, and when the numbers are different,
The information reproducing apparatus according to claim 5, wherein the apparatus is determined to be of the second type. 7. An information reproducing method of an information reproducing apparatus for reproducing data recorded on a mounted magnetic tape in a long-time mode by a magnetic head, wherein: an upper track number and a lower track number of the magnetic tape. A detecting step of detecting the recording type of the data based on a result of the detection in the detecting step; and a step in which the magnetic head moves the magnetic tape by one based on the result of the determination in the determining step. Controlling the data recorded on one of the upper track and the lower track of the magnetic tape when performing the tracing twice. 8. A program for controlling an information reproducing apparatus for reproducing data recorded on a mounted magnetic tape in a long time mode by a magnetic head, wherein: a number of an upper track of the magnetic tape and a number of a lower track of the magnetic tape. A detecting step of detecting the recording type of the data based on a result of the detection in the detecting step; and a step in which the magnetic head moves the magnetic tape by one based on the result of the determination in the determining step. And a reproduction control step of controlling to reproduce the data recorded on one of an upper track and a lower track of the magnetic tape. The recording medium on which it is recorded.