JP2001043633A - Magnetic recording device and magnetic reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record high-quality digital video data on a half-inch tape for a long time by using parts or the like of a conventional VHS recording and reproducing device efficiently and also to easily perform data processing. SOLUTION: In this magnetic recording and reproducing device 10, data in a DV format are recorded on a magnetic tape 12 whose width is a half inch. Concretely, data of three tracks in the DV format are recorded on one track of the magnetic tape 12 whose width is a half inch in a data pattern which is kept unchanged as it is. Moreover, in the device 10, a consecutive recording editing and an inserting recording are performed in a 60-DV track, that is, a 20-track unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a magnetic recording apparatus for recording or reproducing data on or from a magnetic tape, and a magnetic reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, home-use digital video tape recorders and home-use digital video tape recorders for recording digital video signals and digital audio signals on magnetic tape have appeared.

As a recording system of such a digital video tape recorder, a so-called DV system (IEC 61834 heli) is used.
cal scan digital video tape cassette recording sys
temusing 6.35mm magnetic tape for consumers (525/6
0,625 / 50,1125 / 60and1250 / 50systems). In this DV system, the tape width of a video tape used is 6.35 mm (= 1/4 inch), and the so-called VHS system (IEC 774 helical scan videotape cas) of a conventional analog video tape recorder is used.
sette system using 12.65mm magnetic tape on tape V
HS, IEC 1077helical scan video tape cassette syst
em using 12.65mm magnetic tape ontape VHS-Compact
VHS Video Cassette, JIS C 5581 VHS system 12.65mm
The tape width of the video tape used in the magnetic tape helical scanning video cassette system (12.65 mm = 1/1)
2 inches). Despite this, D
In the V system, since the signal to be recorded is compressed and the recording density is increased, it is possible to record for a longer time with higher image quality than the conventional system.

[0004]

Although there is no compatibility between the DV system and the conventional VHS system, for example, the conventional VHS system has the same tape width of 1/2 inch video tape. On the other hand, if a signal in the DV system can be recorded, a high-quality signal can be recorded for a longer time. Also, as described above, the conventional V
If it becomes possible to record and reproduce DV signals on a video tape used in the HS system, parts of the recording / reproducing apparatus used in the conventional VHS system can be used.

According to the present invention, a high-quality digital signal can be recorded and reproduced on a 1 / 2-inch magnetic tape for a long time by using a conventional analog recording and reproducing apparatus, and data processing can be easily performed. It is an object of the present invention to provide a magnetic recording device and a magnetic reproducing device that can be used.

Further, the present invention uses a conventional analog recording / reproducing apparatus to reduce a high-quality digital signal to 1/2.
It is an object of the present invention to provide a magnetic recording apparatus and a magnetic reproducing apparatus that can record and reproduce data on and from an inch magnetic tape for a long time and that can record and reproduce data by expanding the address number of a track.

[0007]

SUMMARY OF THE INVENTION A magnetic recording apparatus according to the present invention is a digital video data generator for generating recording data corresponding to a digital video format applied to a first magnetic tape having a tape width of 1/4 inch. Means, and recording means for recording the recording data generated by the digital video data generating means on a second magnetic tape having a tape width of イ ン チ inch, wherein the digital video data generating means is provided in the digital video format. Data processing is performed using data for 60 tracks as a processing unit,
The recording means continuously records recording data for three tracks in the digital video format generated by the digital video data generating means on one track formed on the second magnetic tape. It is characterized by.

In this magnetic recording apparatus, the tape width is １ ／.
For one track formed on the second magnetic tape of inch, recording data for three tracks in the digital recording format applied to the first magnetic tape having a tape width of 1/4 inch is digitally recorded. Record continuously with the format data pattern. Further, in this magnetic recording apparatus, data processing is performed using data of 60 tracks in the digital video format as a processing unit. The magnetic recording apparatus performs, for example, a splicing edit, an insert recording process, and the like in units of the process.

A magnetic recording apparatus according to the present invention comprises: digital video data generating means for generating recording data corresponding to a digital video format applied to a first magnetic tape having a tape width of 1/4 inch; Recording means for recording the recording data generated by the digital video data generating means on a 1/2 inch second magnetic tape, wherein the digital video data generating means is updated in units of three tracks in the digital video format. The recording means generates recording data to which an absolute address is added, and
It is characterized in that recording data for three tracks in the digital video format generated by the digital video data generating means to which the same absolute address is added are continuously recorded on one track.

In this magnetic recording apparatus, the tape width is １ ／.
For one track formed on the second magnetic tape of inch, recording data for three tracks in the digital recording format applied to the first magnetic tape having a tape width of 1/4 inch is digitally recorded. The data is continuously recorded in a format data pattern, and the data is updated in units of three tracks in the digital video format with respect to the second magnetic tape, within one track formed on the second magnetic tape. The recording data to which the same absolute address is added is recorded.

[0011] The magnetic reproducing apparatus according to the present invention has a tape width of 1/2 inch on which recording data corresponding to a digital video format applied to a first magnetic tape having a tape width of 1/4 inch is recorded. A reproducing means for reproducing the recorded data from the second magnetic tape; and a digital video data processing means for performing data processing of the recorded data reproduced by the reproducing means, wherein the reproducing means comprises:
The recording data of three tracks in the digital video format is continuously reproduced from one track formed on the magnetic tape of the digital video format.
It is characterized in that data processing is performed using data for 0 tracks as a processing unit.

In this magnetic reproducing apparatus, the tape width is １ ／.
For one track formed on the second magnetic tape of inch, the recording data of three tracks is digitally recorded in a digital recording format applied to the first magnetic tape having a tape width of 1/4 inch. Plays back continuously with the format data pattern. Further, in this magnetic reproducing apparatus, data processing is performed using data of 60 tracks in the digital video format as a processing unit. This magnetic reproducing apparatus performs, for example, a splicing edit, an insert recording process, and the like in this processing unit.

In this magnetic recording apparatus, the tape width is １ ／.
For one track formed on the second magnetic tape of inch, recording data for three tracks in the digital recording format applied to the first magnetic tape having a tape width of 1/4 inch is digitally recorded. Record continuously with the format data pattern. Further, in this magnetic recording apparatus, data processing is performed using data of 60 tracks in the digital video format as a processing unit. The magnetic recording apparatus performs, for example, a splicing edit, an insert recording process, and the like in units of the process.

In the magnetic reproducing apparatus according to the present invention, 1/4
From a second magnetic tape having a 1/2 inch tape width on which recording data corresponding to a digital video format applied to a first magnetic tape having an inch tape width is recorded,
A reproducing unit that reproduces the recording data; and a digital video data processing unit that performs data processing of the recording data reproduced by the reproducing unit. The second magnetic tape has a unit of three tracks in the digital video format. The updated recording data is recorded with the same absolute address added in one track formed on the second magnetic tape, and the reproducing means is formed on the second magnetic tape. It is characterized in that recorded data of three tracks in the digital video format is continuously reproduced from one track.

In this magnetic reproducing apparatus, the tape width is 幅.
For one track formed on the second magnetic tape of inch, recording data for three tracks in the digital recording format applied to the first magnetic tape having a tape width of 1/4 inch is digitally recorded. While the data is continuously reproduced in the format data pattern, the data is updated in units of three tracks in the digital video format with respect to the second magnetic tape, and within one track formed on the second magnetic tape. The recording data to which the same absolute address is added is reproduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as an embodiment of the present invention, a recording method for recording video data, audio data, and the like on a magnetic tape as a tape-shaped data recording medium will be described. The recording method to which the present invention is applied is a digital signal generated by a so-called DV method (hereinafter, a digital signal generated by the DV method is applied to a magnetic tape having a tape width of 1/2 inch (12.65 mm). This is a method of recording digital data.
It shall be called a 1/2 inch system. Hereinafter, in describing the recording method to which the present invention is applied, a comparison is made between the DV method (IEC 61834), which is a conventionally known recording method, and the analog VHS method (IEC 774, IEC 1077, JIS C 5581). I will explain while.

FIG. 1 shows a track pattern when DV data is recorded on a magnetic tape having a tape width of 1/4 inch (6.35 mm) used in the DV system (hereinafter, this magnetic tape is called a DV tape). Is shown.

In the DV system, as shown in FIG. 1, for a DV tape having a tape width of 6.35 mm (= 1/4 inch), a video signal or the like is compressed by a rotating drum.
The V data is rotationally recorded. In this rotary drum, for example, two magnetic heads having different azimuth angles are provided at positions opposed by 180 degrees. Therefore, the two magnetic heads are scanned at a predetermined angle with respect to the running direction of the DV tape, and a track pattern is formed as shown in FIG. In this DV system, tracks recorded by one magnetic head are replaced with odd tracks O1, O3, O3.
5, O7, and O9, and tracks recorded by the other magnetic head are even tracks E2, E4, E6, E8, and E.
When 10 is set, a video signal corresponding to the NTSC system for one frame is recorded on a total of ten tracks of five odd tracks and five even tracks. Also,
In the PAL system, a video signal for one frame is recorded on a total of 12 tracks.

In the DV system, 24/25 conversion is applied to all data recorded on each track. By converting the data to be recorded to 24/25, the ATF (Au
A pilot signal for tomatic track finding is superimposed on the entire track. By detecting this pilot signal during reproduction, tracking of the magnetic head can be performed. In this 24/25 conversion, an extra bit (1 bit) is inserted into data of every 24 bits (3 bytes) so that low frequency pilot components of three frequencies are superimposed on a data sequence of data to be recorded. I have. Specifically, the run length of the data to be recorded is set to 9 or less, and pilot signals of frequencies f0, f1 and f2 that satisfy the spectrum of FIG. 2 are superimposed on each track. In the DV system, for example, odd tracks O1, O3, O5, O
Pilot signals of frequency f0 are superimposed on 7, O9, and pilot signals of frequency f1 and frequency f2 are alternately superimposed on even tracks E2, E4, E6, E8, and E10. Therefore, for each track as a whole,
f0, f1, f0, f2, f0, f1, f0, f2,.
A pilot signal of each frequency is recorded so as to be repeated. By recording such a pilot signal, when the magnetic head scans the track on which the frequency f0 is recorded, the frequency f0 is read from the adjacent track.
The pilot components of 1 and f2 can be obtained as a crosstalk signal, and stable tracking can be applied during reproduction.

In this DV system, an absolute track number is assigned to each track recorded on a DV tape, and the absolute address of each track is defined. The absolute track number is sequentially assigned to each track from the beginning of the DV tape, and is used for managing data recorded on the DV tape. For example,
By providing the playback device with the absolute track number of the track on which the beginning of the chapter, which is the playback unit of the video data, is recorded, it is possible to quickly search for the beginning of the chapter currently being played.

This absolute track number is information composed of 23-bit data, and is recorded in the ID part of the subcode of the DV data.

FIG. 3 is a diagram showing a digital 1/2 to which the present invention is applied.
This shows a track pattern when an inch digital signal is recorded on a magnetic tape having a tape width of 1/2 inch (hereinafter, this magnetic tape is referred to as a 1/2 inch tape).

In the digital 1/2 inch system, DV data is rotationally recorded on a 1/2 inch tape. This 1 / 2-inch tape has the same width as the magnetic tape used in the conventional VHS system (such as IEC 774) for recording analog video signals, and has almost the same magnetoelectric conversion as the DV tape. Metal deposition (ME) with characteristics
It is a tape. The tape thickness of this 1/2 inch tape is 7 μm.

As the rotating drum for performing the rotation recording, a drum having a drum diameter of 62 mm similar to the conventional analog VHS system is used. The rotation speed of the rotary drum is 3000 rpm, which is 5/3 times that of the conventional VHS system.
Further, for example, two magnetic heads are provided on the rotary drum at positions 180 degrees opposite to each other with the center of rotation therebetween. Similar to the DV system, these magnetic heads have an azimuth angle of ± 20 degrees and a head width of 10 to 15 μm.

The effective wrap length of the 1/2 inch tape is about 178 degrees, the track length is 96 mm, and the tape speed is 9.5 mm / sec.

Therefore, the two magnetic heads are scanned at a predetermined angle with respect to the running direction of the 1/2 inch tape, and a track pattern as shown in FIG. 3 is formed. The track thus formed has a track pitch of 9.9 μm and a shortest recording wavelength of 0.46 μm.
m, and a C / N almost similar to that of the DV system can be obtained. Also, the cassette size for accommodating a 1/2 inch tape is 188 × 104 × 2 which is equivalent to the analog VHS system.
If it is 5 mm, the tape length is about 762 m. For example, if the DV data transfer rate is 25 Mbps on average, 250 GBytes of data can be recorded per cassette.

Here, in the digital 1/2 inch system,
For one track of a 1/2 inch tape, three tracks in the DV system (hereinafter, a data unit used as a track in the DV system is referred to as a DV track) are three.
The main DV data is continuously recorded with the data pattern of the DV system unchanged. That is, in the digital 1 / 2-inch system, three DV tracks, which are a set of “odd track” + “even track” + “odd track”, or “even track” + “odd track” + “even track” Are recorded as one set of three DV tracks.

For example, in the digital 1/2 inch system,
The three DV tracks of the odd track O1, the even track E2, and the odd track O3 are grouped and recorded on the first track. On the next second track, three DV tracks of an even track E4, an odd track O5, and an even track E6 are recorded as a set. On the next third track, three DV tracks of an odd track O7, an even track E8, and an odd track O9 are recorded as a set. And on the next fourth track,
The three DV tracks of the even track E10, the odd track O1 of the next frame, and the even track E2 are recorded as a set. In this manner, three consecutive DV tracks are sequentially recorded for each subsequent track on the 1/2 inch tape.

Therefore, in the digital 1/2 inch system,
One frame of a video signal corresponding to NTSC is recorded on three and one-third tracks of a 1/2 inch tape. Also, video signals corresponding to PAL for one frame are recorded on four tracks on a 1/2 inch tape.

In the digital 1/2 inch system, 2
By performing the 4/25 conversion, pilot signals of three frequencies f0, f1, and f2 for the ATF are superimposed. The frequency of this pilot signal is changed for each DV track as shown in FIG.
0, f1, f0, f2, f0, f1, f0, f2,.
And so on. 465 kHz for frequency f1
The z and frequency f2 include a low frequency pilot component of 697.5 kHz.

Here, when three DV tracks recorded in one track in the digital 1/2 inch system are divided into a lower stage, a middle stage, and an upper stage (the lower stage is on the head entrance side), the middle stage is " When f0, the upper and lower stages are "f1" or "f2", respectively, and when the upper and lower stages are "f0", the middle stage is "f1" or "f2". When the lower, middle, and upper DV tracks are individually scanned in the longitudinal direction of the tape, the pilot signals are: f0, f1, f0, f2, f0, f1,
f0, f2,... Therefore, in the digital 1/2 inch system, the magnetic head can be tracked by applying the ATF servo by the following three methods.

In the first tracking method, ATF servo is performed using a pilot signal of a middle DV track. For example, when the magnetic head is positioned on the middle DV track on which the frequency f0 is superimposed, the middle DV adjacent to the tape longitudinal direction on which the frequencies f1 and f2 are superimposed.
Reproduce crosstalk from the track and apply ATF servo.

In the second tracking method, ATF servo is applied using pilot signals of the lower and upper DV tracks. For example, when the magnetic head is located on the lower or upper DV track on which the frequency of f0 is superimposed, f
The crosstalk is reproduced from the lower or upper DV track adjacent in the longitudinal direction of the tape on which the frequencies 1 and f2 are superimposed, and ATF servo is applied.

The third tracking method includes a lower stage, a middle stage,
Regardless of the upper stage, when the magnetic head is positioned on the DV track on which the frequency of f0 is superimposed, crosstalk is reproduced from the DV track adjacent in the longitudinal direction of the tape on which the frequencies of f1 and f2 are superimposed, and the ATF servo is controlled. Multiply.

In the conventional DV system, tracks on which f0 is superimposed are provided every other track, so that one magnetic head always reproduces crosstalk. Therefore, when the head clogs and the like extend over several tracks, the ATF servo is disturbed and data cannot be stably reproduced. However, in the digital 1/2 inch system, the ATF servo can be applied by the above three kinds of methods. Therefore, even if one magnetic head clogs the head over several tracks, the other magnetic head uses the ATF servo. ATF servo can be applied.
Therefore, in the digital 1/2 inch system, data can be stably reproduced without disturbing the ATF servo.

As described above, the pilot signal does not have to be updated by updating the low frequency signal for each DV track and superimposed. For example, as shown in FIG. 5, a pilot signal of the same frequency may be superimposed on all three DV tracks in one track, and ATF servo may be applied.

In the digital 1/2 inch system in which data is recorded in such a format, the track 2
Data processing is performed using 0 lines as one processing unit. That is, in such a digital 1/2 inch system, the DV
Data processing is performed using data for 60 tracks as one processing unit.

The reason is as follows.

In the DV system, in the case of NTSC, ten D
One frame of data is recorded on the V track, and PAL
In this case, one frame of data is recorded on 12 DV tracks. When performing connection editing, insert recording, etc. on a 1/2 inch tape on which NTSC and PAL are mixedly recorded, if processing is performed in units of 60 DV tracks, which is the least common multiple of 10 DV tracks and 12 DV tracks, a frame is obtained. Continuity can be maintained. That is, in this digital 1/2 inch system, three DV tracks are recorded continuously on one track, so that data processing may be performed in units of 20 tracks.

Further, a pilot signal is transmitted in units of tracks corresponding to the DV system,... F0, f1, f0, f
It is assumed that the data is superimposed on the data in a repetition of 2, f0, f1, f0, f2,. In this case, NTS
In C, as shown in FIG. 6 (A), one cycle is 60 DV tracks (ie, 20 tracks in the digital 1/2 inch system). In PAL, FIG.
As shown in (B), one cycle is composed of 12 DV tracks (that is, four tracks in the digital 1/2 inch system). Therefore, also in this case, the least common multiple of the processing cycle of NTSC and PAL is 60 DV tracks, that is, 20 tracks in the digital 1/2 inch system.

Further, the pilot signal is converted to a digital 1/2
.. F0, f in track units corresponding to the inch system
It is assumed that the data is superimposed on the data in a repetition of 1, f0, f2, f0, f1, f0, f2,. In this case, in NTSC, as shown in FIG.
One cycle is made up of V tracks (ie, 20 tracks in the digital 1/2 inch system). In the PAL, as shown in FIG. 7B, one cycle is formed by 12 DV tracks (that is, four tracks in the digital 1/2 inch system). Therefore, also in this case, NTSC and P
The least common multiple of the processing cycle with the AL is 60 DV tracks, that is, 20 tracks in the digital 1/2 inch system.

Based on the above reasons, digital 1/2
In the inch system, data processing is performed using 20 tracks as one processing unit. For this reason, even with a 1/2 inch tape in which NTSC and PAL are mixed, it is possible to easily carry out connection editing and insert recording. Further, even if the recorded data is re-processed, the regularity of the pilot signal is maintained and the servo does not come off. This processing unit may be a unit of an integral multiple of the 60 DV track.

Also in the digital 1/2 inch system in which data is recorded in such a format, an absolute track number is assigned to each track recorded on a 1/2 inch tape, as in the DV system. , The absolute address of each track is defined. In the digital 1/2 inch system, the ID in the subcode of the DV track is 23
Described by bit data.

Here, if this 1/2 inch tape is stored in a 188 × 104 × 25 mm cassette equivalent to the analog VHS system, the tape length becomes about 762 m. Since the tape running speed is 9.5 mm / sec,
The recording / reproduction time is 762 m / (9.5 × 10
^-3 (m)) = 80210 seconds. In the digital 1/2 inch system, the number of tracks in the DV system is 30 per second.
Since 0 is recorded, the number of tracks of the DV track is
A ^{300 × 80210 ≒ 24063000> 2 23} .

For this reason, in the digital 1/2 inch system, as shown in FIG. 8, the same absolute track number is assigned to the lower, middle, and upper DV tracks recorded in one track. The absolute address is updated for each 3DV track. This allows
The number of tracks to which an absolute address can be assigned is increased without increasing the data amount of the address specified in the conventional DV system.
It can be doubled to record for a long time.

As shown in FIG. 9, the first two bits of the absolute track number in the subcode are assigned to the lower DV track, the middle DV track, or the upper DV track.
A code for identifying a track may be used, and the remaining 21 bits may be combined with three DV tracks to provide an absolute address having a total length of 63 bits. For example, the first two bits of the absolute track number of the upper DV track are set to “0”.
The first two bits of the absolute track number of the middle DV track are set to "10" and the first two bits of the absolute track number of the lower DV track are set to "11." The remaining 21 bits of data are concatenated in the order of the 2-bit identification code of the track number to form a 63-bit absolute address as a whole. The maximum track number can be set to 2 ⁶³ -1 without increasing the data amount of the specified address, and recording for a longer time can be performed.

Hereinafter, an example of the specification of the recording system for the magnetic tape to which the present invention is applied is specifically shown in a table corresponding to NTSC and PAL. For comparison, the specification of the conventional DV system and the specification of the analog VHS system are also partially shown.

[0048]

[Table 1]

As described above, in the digital 1/2 inch system which is a recording system for a magnetic tape to which the present invention is applied,
Since the data of three DV system data is continuously recorded on a 1 / 2-inch tape in one data track in the same data pattern, the tape area can be used effectively. It is possible to record for a longer time. Therefore, the necessary tape length can be shortened, and the tape consumption can be improved.

When the digital 1/2 inch system is used, the recording / reproducing apparatus can increase the number of rotations of the drum to 1800 rpm.
3,000 rpm, the mechanical deck portion of the conventional analog VHS video tape recorder can be used as it is, and the track pattern described above can be formed on a 1/2 inch tape.

Next, a recording / reproducing apparatus for recording video data and audio data using the digital 1/2 inch system described above will be described.

FIG. 10 shows a schematic configuration of a recording / reproducing apparatus according to an embodiment of the present invention.

Recording / reproducing apparatus 10 according to an embodiment of the present invention
Is a video tape recorder capable of switching between a conventional analog VHS system and a digital 1/2 inch system to record / reproduce both signals.

The recording / reproducing apparatus 10 is loaded with either the 1/2 inch tape 12 or the VHS tape 11 stored in a cassette. This recording / reproducing device 1
0 indicates that when the VHS tape 11 is loaded, a signal generated by the conventional analog VHS system is recorded on the VHS tape 11 and the VHS tape 11 is used to record a signal of the conventional analog VHS system. To play. When the 1/2 inch tape 12 is loaded, the recording / reproducing apparatus 10 records the data generated by the above-mentioned digital 1/2 inch method on the 1/2 inch tape 12, and The above-mentioned digital 1/2 inch data is reproduced from the 1/2 inch tape 12.

The recording / reproducing apparatus 10 includes two magnetic heads 2
The rotating drum 23 is provided with a capstan 24 and a pinch roller 25 for running the VHS tape 11 or 1/2 inch tape 12 at a constant speed. Further, the recording / reproducing device 10 includes two magnetic heads 2.
A head switch circuit 26 for switching between 1 and 22 is provided, a drum motor 27 for driving the rotary drum 23 to rotate, and a capstan motor 28 for driving the capstan 24 to rotate. Further, the recording / reproducing device 10 performs a VHS signal processing unit 31 for performing signal processing of a VHS signal, a DV data processing unit 32 for performing data processing of DV data, and controls driving of a drum motor 27 at the time of recording / reproducing of a VHS signal. VH
An S drum servo circuit 33; a DV drum servo circuit 34 for controlling the driving of the drum motor 27 when recording and reproducing DV data; and a VHS capstan servo circuit 35 for controlling the driving of the capstan motor 28 when recording and reproducing the VHS signal. , A DV capstan servo circuit 36 for controlling the driving of the capstan motor 28 when recording and reproducing DV data
And an input / output terminal 37.

The recording / reproducing apparatus 10 includes a recording / reproducing signal changeover switch 38 for switching between the VHS signal processing section 31 and the DV data processing section 32 and connecting to the head switch circuit 26, a VHS drum servo circuit 33 and a DV drum servo. A drum servo changeover switch 39 for switching between the circuit 34 and the drum motor 27 and a capstan servo changeover switch 40 for switching between the VHS capstan servo circuit 35 and the DV capstan servo circuit 36 and connecting to the capstan motor 28; , An input / output signal switch 4 for switching between the VHS signal processing unit 31 and the DV data processing unit 32 and connecting to the input / output terminal 37
1 is provided. Further, the recording / reproducing apparatus 10 includes a controller 42 for controlling the switches 38 to 41 and a tape format detecting unit 43 for determining the type of the loaded tape.

The rotating drum 23 has one rotation center.
Two magnetic heads 21 and 22 are provided at positions facing each other by 80 degrees. These two magnetic heads 21 and 22
When the VHS tape 11 is loaded, this VH
A VHS signal is recorded on the S tape 11 at an azimuth angle of ± 6 °. These two magnetic heads 21 and 22 are 1
When the 1/2 inch tape 12 is loaded,
DV data is recorded on a 2-inch tape 12 at an azimuth angle of ± 20 °. The rotating drum 23 is a drum motor 2
7 is driven to rotate. Two magnetic heads 21 and 22
Is a head switch circuit 26
The switching is controlled by.

The capstan 24 and the pinch roller 25 are
The loaded VHS tape 11 or 1/2 inch tape 12 is interposed therebetween and is run at a constant speed. When the VHS tape 11 is loaded, the capstan 24 runs the VHS tape 11 at a speed of 33.35 mm / sec. When the 1/2 inch tape 12 is loaded, the capstan 24 runs the 1/2 inch tape 12 at a speed of 9.5 mm / sec. The capstan 24 is driven to rotate by a capstan motor 28.

When recording the VHS signal on the VHS tape 11, the head switch circuit 26 applies the VHS signal supplied from the VHS signal processing unit 31 to the magnetic heads 21 and
2 and switches the magnetic head that records the VHS signal on the VHS tape 11 according to the rotation timing of the rotating drum 23. The head switch circuit 26
When reproducing the VHS signal from the VHS tape 11,
The VHS signal reproduced from the two magnetic heads 21 and 22 is supplied to the VHS signal processing unit 31, and the magnetic head that reproduces the VHS signal from the VHS tape 11 is switched according to the rotation timing of the rotating drum 23. The head switch circuit 26 outputs the DV signal to the 1/2 inch tape 12.
When recording data, the DV data supplied from the DV data processing unit 32 is supplied to the magnetic heads 21 and 22, and the DV data 12 is added to the DV data 12 according to the rotation timing of the rotary drum 23. Switch the magnetic head for recording. At this time, the head switch circuit 26 supplies the DV data supplied from the DV data processing unit 32 to one magnetic head every three tracks in the DV track, and performs control so that the 3D track is recorded in one track. Do. The head switch circuit 26 is １ ／
When reproducing DV data from the inch tape 12,
The DV data reproduced from the two magnetic heads 21 and 22 are supplied to the DV data processing unit 32, and the 1/2 inch tape 1 according to the rotation timing of the rotating drum 23.
The magnetic head for reproducing the DV data is switched from 2.

When the VHS tape 11 is loaded, the drum motor 27 has a VHS drum servo circuit 33.
The rotary drum 23 is driven to rotate in accordance with the drive signal from the controller, and an FG signal indicating the rotation speed is supplied to the VHS drum servo circuit 33. The drum motor 27 is １ ／
When the inch tape 12 is loaded, the rotary drum 2 is driven in accordance with a drive signal from the DV drum servo circuit 34.
3 is driven to rotate, and an FG signal indicating the rotation speed is supplied to the DV drum servo circuit 34.

When the VHS tape 11 is loaded, the capstan motor 28 drives the capstan 24 according to a drive signal from the VHS capstan servo circuit 35.
, And supplies an FG signal indicating the rotation speed to the VHS capstan servo circuit 35. When the 1 / 2-inch tape 12 is loaded, the capstan motor 28 drives the capstan 24 to rotate in response to a drive signal from the DV capstan servo circuit 36 and outputs an FG signal indicating the rotation speed. It is supplied to the DV capstan servo circuit 36.

The VHS signal processing circuit 31 is used when the VHS tape 11 is loaded. The VHS signal processing circuit 31 performs signal processing on an analog video signal and an audio signal input via the input / output terminal 37 at the time of recording to generate a VHS signal, and at the time of reproduction, outputs the VHS signal from the magnetic heads 21 and 22. The signal processing is performed on the supplied VHS signal to generate an analog video signal and an audio signal.

The DV data processing section 32 is used when the 1/2 inch tape 12 is loaded. The DV data processing unit 32 performs data processing on an analog video signal and an audio signal input via the input / output terminal 37 at the time of recording to generate DV data, and at the time of reproduction, outputs from the magnetic heads 21 and 22. Data processing is performed on the supplied DV data to generate analog video signals and audio signals. The DV data processing unit 32 may input and output baseband video data and audio data via the input / output terminal 37.

The VHS drum servo circuit 33 is used when the VHS tape 11 is loaded. This VH
The S drum servo circuit 33 servo-controls the drum motor 27 based on the FG signal supplied from the drum motor 27 so that the rotation speed of the rotating drum 23 is constant at 1800 rpm.

The DV drum servo circuit 34 is used when the 1/2 inch tape 12 is loaded. The DV drum servo circuit 34 controls the drum motor 27 based on the FG signal supplied from the drum motor 27 so that the rotation speed of the rotary drum 23 is constant at 3000 rpm.
Servo control.

The VHS capstan servo circuit 35 outputs V
Used when the HS tape 11 is loaded. The VHS capstan servo circuit 35 adjusts the running speed of the loaded VHS tape 11 to 33.35 mm / V based on the FG signal supplied from the capstan motor 28.
The capstan motor 28 is servo-controlled so as to be constant in seconds.

The DV capstan servo circuit 36 calculates 1 /
Used when the 2-inch tape 12 is loaded. The VHS capstan servo circuit 35 adjusts the running speed of the loaded 1 / 2-inch tape 12 to 9. based on the FG signal supplied from the capstan motor 28.
The capstan motor 28 is controlled to be constant at 5 mm / sec.
Servo control.

The tape format detector 43 detects the type of the loaded VHS tape 11 and the type of the 1/2 inch tape 12. For example, the shape of the cassette accommodating the magnetic tape is different between the VHS tape 11 and the 1/2 inch tape 12, and the tape format detection unit 43 detects the difference mechanically or optically. Further, for example, the tape format detection unit 43
Is detected, and if the signal level excluding noise is larger than a specified value, it is determined that the loaded magnetic tape is the VHS tape 11.

The controller 42 controls the switching of each of the switches 38 to 41 based on the tape type information of the loaded magnetic tape detected by the tape format detector 43. In addition, the controller 42 controls the VH during recording.
Supplementary information and the like are supplied to the S signal processing unit 31 and the DV data processing unit 32, and the VHS signal processing unit 3
1 and the additional information and the like from the DV data processing unit 32, and controls reproduction and recording.

The controller 42 determines that the magnetic tape loaded with the tape format detection unit 43 is a VHS tape 11
, The switches 38 to 41 are set to V
Connect to HS terminal side. When the switch 38 is switched to the VHS terminal side, the recording / reproducing signal switch 38 connects the VHS signal processing unit 31 to the head switch circuit 26,
The data processing unit 32 and the head switch circuit 26 are separated. When switched to the VHS terminal side, the drum servo changeover switch 39 connects the VHS drum servo circuit 33 to the drum motor 27 and sets the DV drum servo circuit 3
4 and the drum motor 27 are separated. When the capstan servo changeover switch 40 is switched to the VHS terminal side, the VHS capstan servo 35 and the capstan motor 28 are connected, and the DV capstan servo circuit 3
6 and the capstan motor 28 are separated. When switched to the VHS terminal side, the input / output signal switch 41 connects the VHS signal processing circuit 31 to the input / output terminal 37 and disconnects the DV data processing circuit 32 from the input / output terminal 37.

When the tape format detecting section 43 detects that the loaded magnetic tape is the 1/2 inch tape 12, the controller 42 switches each of the switches 38-4.
1 is connected to the DV terminal side. When the switch 38 is switched to the DV terminal side, the recording / playback signal switch 38 connects the DV data processing unit 32 to the head switch circuit 26 and
The HS signal processing unit 31 and the head switch circuit 26 are disconnected. When switched to the DV terminal side, the drum servo changeover switch 39 connects the DV drum servo circuit 34 and the drum motor 27 and the VHS drum servo circuit 3
3 and the drum motor 27 are separated. When the switch is switched to the DV terminal side, the capstan servo changeover switch 40 connects the DV capstan servo circuit 36 and the capstan motor 28 and the VHS capstan servo 35
And the capstan motor 28 are separated. When switched to the DV terminal side, the input / output signal switch 41 connects the DV data processing circuit 32 to the input / output terminal 37 and disconnects the VHS signal processing circuit 31 from the input / output terminal 37.

As described above, in the recording / reproducing apparatus 10, VH
The S tape 11 and the 1/2 inch tape 12 are automatically discriminated, and when the VHS tape 11 is loaded, an analog VHS signal can be recorded and reproduced, and the 1/2 inch tape 12 is loaded. Digital 1
/ 2 inch data can be recorded and reproduced.

In the recording / reproducing apparatus 10, an example in which the rotary drum 23 is provided with two magnetic heads 21 and 22 is shown. For example, as shown in FIG. 11, two magnetic heads 51 and 52 for DV are used. And two magnetic heads 53 for VHS,
54 may be provided on the rotating drum 23.

In this case, the VHS head switch circuit 26
a and the DV head switch circuit 26b are separately provided.

The VHS head switch circuit 26a receives VH
Used when the S tape 11 is loaded, the VHS
The VHS signal supplied from the signal processing unit 31 is supplied to the magnetic heads 21 and 22, and the magnetic heads 53 and 54 that record the VHS signal on the VHS tape 11 are switched according to the rotation timing of the rotating drum 23.

The DV head switch circuit 26b is １ ／
When the inch tape 12 is loaded, the DV data supplied from the DV data processor 32 is
The magnetic head that supplies the data to the DV data 12 and records the 1 / 2-inch tape in accordance with the rotation timing of the rotary drum 23 is switched.

The switching between the VHS head switch circuit 26a and the DV head switch circuit 26b is performed by the controller 42.

Next, the configuration and processing contents of the DV data processing section 32 will be described in more detail.

FIG. 12 is a block diagram of the DV data processing section 32.

The DV data processing section 32 includes an A / D converter 6
1, a D / A converter 62, a blocking / shuffling unit 63, a memory 64, a discrete cosine transform / inverse discrete cosine transform (DCT / IDCT) unit 65, a quantization / inverse quantization unit 66, and a fixed Lengthening section 67, shuffle /
A deshuffle section 68, a memory 69, an AD / DA converter 71, an audio data processing section 72, a multiplex / demultiplex section 73, an ECC section 74,
A 4/25 conversion unit 75 and a modulation / demodulation unit 76 are provided.

First, the DV data processing unit 3 at the time of recording
The content of the process 2 will be described.

The analog video signals (luminance signal, red color difference signal, blue color difference signal) supplied from the imaging unit 11 are A /
The data is converted into digital data by the D converter 61. A /
The video data digitized by the D converter 61 is
It is sent to the blocking / shuffling unit 63.

The blocking / shuffling unit 63
Perform block processing and shuffling processing on the video data. The block process is a process of dividing video data (luminance data Y, red color difference data C _R , blue color difference data C _B ) into 8 × 8 pixel blocks which are basic units of DCT (discrete cosine transform). Incidentally, four blocks and color difference data C _R of the luminance data Y, and six blocks each consisting of a block of C _B are treated as one processing unit. This processing unit is called a macroblock. The shuffling process is a process of exchanging data in units of five macroblocks so that the amount of data after compression is averaged in a screen.
The block processing and the shuffling processing are performed on the memory 64. The video data that has been subjected to the block processing and the shuffling processing is sent to the DCT / IDCT section 65.

The DCT / IDCT unit 65 performs DCT on the input video data, orthogonally transforms the video data, and sends the orthogonally transformed video data to the quantization / inverse quantization unit 66.

The quantization / inverse quantization section 66 performs quantization by dividing the DCT coefficient by an integer value called a quantization step. Specifically, the quantization step is selected so that the maximum number of bits does not exceed the target number of bits after quantization, and quantization is performed. Further, the quantization / inverse quantization unit 6
6 performs zigzag scanning of DCT coefficients quantized for each block from DC component data, and performs variable length coding.
The quantized and variable-length encoded video data is sent to the fixed length unit 67.

The fixed-length section 67 packs the input video data every five sync blocks. The sync block indicates a small area obtained by dividing a DV track of a magnetic tape (1/2 inch tape). That is, the recording area of the track on the magnetic tape is divided into small areas called sync blocks, and video data is packed in this unit. In the DV system, the number of sync blocks included in one track is 135. In the digital 1/2 inch system according to the embodiment to which the present invention is applied,
Since data of three tracks in the DV system is recorded on one track, the number of sync blocks included in one track is 405, which is three times that. The video data packed every five sync blocks is sent to the shuffle / deshuffle unit 68.

The shuffle / deshuffle section 68 exchanges data in the memory 69 so that the video data packed every five sync blocks can be reproduced in the same flow as the original temporal flow of the image as much as possible. I do. The replaced video data is sent to the multiplex / demultiplex unit 73.

An analog audio signal supplied from an external microphone or an audio input terminal is converted into digital data by an AD / DA converter 71. The audio data digitized by the AD / DA converter 71 is
The data is sent to the audio data processing unit 72.

The audio data processing section 72 converts the input audio data into a data format according to the DV system such as packing for each sync block.
It is sent to the multiplex / demultiplex unit 73.

The controller 42 has a sub code,
The additional information for recording in the ITI, video AUX, audio AUX, etc. is sent to the multiplex / demultiplex unit 73. For example, information on a track, a title of video data, a title of audio data, and the like are sent to the multiplex / demultiplex unit 73.

Further, the controller 42 generates a 23-bit absolute track number stored in the ID section in the subcode, and generates the multiplex / demultiplex section 73.
Send to

Multiplex / demultiplex unit 73
Are supplied video data, audio data, and so on so as to form data for one track in the DV system.
The additional information is multiplexed. Then, the multiplexed data is
The data is sent to the ECC unit 74 for each data of one track in the DV system.

The ECC unit 74 adds an error correction code to data supplied for each track in the DV system. The ECC unit 74 adds an inner parity and an outer parity independently for each of the video data, the audio data, and the additional information. The data to which the error correction code is added is sent to the 24/25 conversion unit 75.

The 24/25 conversion section 75 performs 24/25 conversion on the supplied data and converts the data into three frequencies f for the ATF.
The pilot signals of 0, f1, and f2 are superimposed on the data.
Here, the 24/25 conversion unit 75 may record a pilot signal having a different frequency for each DV track,
A pilot signal having a different frequency may be recorded for each track in the digital 1/2 inch system, that is, for each 3DV track. The data subjected to the 24/25 conversion is sent to the modulation / demodulation unit 76.

The modulation / demodulation unit 76 performs channel coding on the data to be recorded, and converts the data sequence so as to be compatible with the digital recording / reproducing system.

In the DV data processing section 32, at the time of recording,
The data processed as described above is output as DV data.

Next, the processing contents of the DV data processing section 32 during reproduction will be described.

The modulation / demodulation unit 76 demodulates the channel-coded data and sends it to the 24/25 conversion unit 75. The 24/25 conversion section 75 converts the demodulated data into 24
The extra bit added to the bit data is removed and converted to data before 24/25 conversion. The 24/25 conversion unit 75 sends the data with the extra bits removed to the ECC unit 74. ECC part 7
5 performs error correction processing based on the error correction code added to each of the video data, audio data, and additional information. Error-corrected data is
This is sent to the multiplex / demultiplex unit 73.

Multiplex / demultiplex unit 73
Separates video data, audio data, and additional information multiplexed for each track in the DV system. The separated additional information is sent to the controller 42. The separated audio data is subjected to data processing by an audio data processing unit 72, then converted to an analog signal by an AD / DA converter 71, and output to the outside. Also, the separated video data is shuffled /
It is sent to the deshuffle section 68.

This video data is subjected to a deshuffle processing by a shuffle / deshuffle section 68 and a fixed length section 67.
, And is dequantized by the quantization / dequantization unit 66, and sent to the DCT / IDCT unit 65. The DCT / IDCT unit 65 performs IDCT on the input video data and sends the video data to the blocking / shuffling unit 63. The blocking / shuffling unit 63
The input video data is subjected to deshuffle processing and block decomposition processing, and is sent to the D / A converter 62.

The D / A converter 62 converts digital video data into an analog video signal and outputs it to an external device.

As described above, in the recording / reproducing apparatus 10 according to the embodiment of the present invention, a single track formed on a 1/2 inch tape having a tape width of 1/2 inch has a DV
The recording data for three tracks applied in the system is continuously recorded or reproduced. Therefore, the recording / reproducing apparatus 10
Thus, high-quality data can be recorded for a long time on a 1/2 inch tape, and the mechanical deck of a conventional VHS recording / reproducing apparatus can be effectively used.

Further, in the recording / reproducing apparatus 10 according to the embodiment of the present invention, the conventional analog VHS tape and the 1/2 V used in the digital 1/2 inch system to which the present invention is applied.
It can handle both inch tapes and automatically discriminate between them, and record analog VHS video signals and digital 1/2 inch signals to which the present invention is applied.

In the recording / reproducing apparatus 10 according to the embodiment of the present invention, data for 20 tracks (data for 60 tracks in the DV format) is used as a processing unit.
Perform data processing. For this reason, the recording / reproducing apparatus 10 can easily perform data processing such as splicing editing and insert recording even on a 1 / 2-inch tape in which NTSC and PAL are mixed. Even if the recorded data is reprocessed, the regularity of the servo signal can be maintained.

Further, in the recording / reproducing apparatus 10 according to the embodiment of the present invention, the data is updated in units of three DV tracks on a 1/2 inch tape, and one track is formed on the 1/2 inch tape. Record and reproduce the record data to which the same absolute address is added. Therefore, the recording / reproducing apparatus 10 can record for a long time by increasing the number of tracks to which absolute addresses can be assigned without increasing the data amount of the address specified in the DV format.

In the recording / reproducing apparatus 10 according to the embodiment of the present invention, the absolute address areas in three DV tracks continuously recorded on one track of a 1/2 inch tape are connected to form a DV format. The recording data to which the absolute address updated in units of three tracks is added and recorded. Therefore, the recording / reproducing apparatus 10 can record for a long time by increasing the number of tracks to which absolute addresses can be assigned without increasing the data amount of the address specified in the DV format.

[0107]

According to the present invention, one track formed on the second magnetic tape having a tape width of 1/2 inch is applied to the first magnetic tape having a tape width of 1/4 inch. The recording data for three tracks in the digital recording format is continuously recorded and reproduced according to the data pattern of the digital recording format. Further, in the present invention, data processing is performed using data for 60 tracks in the digital video format as a processing unit. Therefore, in the present invention, the second mixed NTSC and PAL
Even with a magnetic tape, data processing such as splicing editing and insert recording can be easily performed. Even if the recorded data is reprocessed, the regularity of the servo signal can be maintained.

Further, in the present invention, one track formed on the second magnetic tape having a tape width of 1/2 inch is applied to the first magnetic tape having a tape width of 1/4 inch. The recording data of three tracks in the digital recording format is continuously recorded and reproduced in the data pattern of the digital recording format, and is updated on the second magnetic tape in units of three tracks in the digital video format. The recording data to which the same absolute address is added in one track formed on the second magnetic tape is recorded and reproduced. For this reason, in the present invention, the number of tracks to which an absolute address can be added is expanded without increasing the data amount of the address specified in the digital recording format,
You can record for a long time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a track pattern when a digital signal of the DV system is recorded on a magnetic tape having a tape width of 6.35 mm used in the DV system.

FIG. 2 is a diagram showing a spectrum of a pilot signal superimposed on data of each track.

FIG. 3 shows a digital signal of a recording method to which video data is recorded on a magnetic tape to which the present invention is applied.
FIG. 6 is a diagram showing a track pattern when recording on a 1/2 inch magnetic tape.

FIG. 4 is a diagram illustrating a method of superimposing a pilot signal.

FIG. 5 is a diagram illustrating another method of superimposing a pilot signal.

FIG. 6A is a diagram illustrating a case where video data of the NTSC system is recorded, and illustrating a pilot signal updated in units of tracks corresponding to the DV system.
FIG. 4B is a diagram illustrating a case where video data of the PAL system is recorded, and illustrating a pilot signal updated for each track corresponding to the DV system.

FIG. 7A is a diagram illustrating a pilot signal updated in units of tracks corresponding to a digital 1/2 inch system when recording video data of the NTSC system. FIG. 4B is a diagram illustrating a case where video data of the PAL system is recorded, and illustrating a pilot signal updated in units of tracks corresponding to the digital 1/2 inch system.

FIG. 8 is a diagram for explaining a method of assigning absolute track numbers in a recording method to which the present invention is applied.

FIG. 9 is a diagram for explaining another method of assigning an absolute track number in the recording method to which the present invention is applied.

FIG. 10 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 11 is a diagram for explaining an example in which four magnetic heads are provided on a rotating drum of the recording / reproducing apparatus according to the embodiment of the present invention.

FIG. 12 is a block diagram of a DV data processing unit of the recording / reproducing apparatus according to the embodiment of the present invention.

[Explanation of symbols]

10 recording / reproducing device, 11 VHS tape, 12 1 /
2 inch tape, 21, 22 magnetic head, 23 rotating drum, 24 capstan, 26 head switch circuit, 27 drum motor, 28 capstan motor,
31 VHS signal processing unit, 32 DV data processing unit, 4
3 Tape format detector, 42 controllers

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsuo Okamoto 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 5D044 AB05 AB07 BC01 CC03 DE02 DE04 DE38 DE52 5D077 AA08 DC01 DD01

Claims (4)

[Claims] 1. A digital video data generating means for generating recording data corresponding to a digital video format applied to a first magnetic tape having a tape width of 1/4 inch, and a second video signal having a tape width of 1/2 inch. Recording means for recording the recording data generated by the digital video data generating means on the magnetic tape, wherein the digital video data generating means performs data processing using data of 60 tracks in the digital video format as a processing unit. The recording means continuously records recording data for three tracks in the digital video format generated by the digital video data generating means on one track formed on the second magnetic tape. A magnetic recording device, characterized in that: 2. A digital video data generating means for generating recording data corresponding to a digital video format applied to a first magnetic tape having a tape width of 1/4 inch, and a second video signal having a tape width of 1/2 inch. Recording means for recording the recording data generated by the digital video data generating means on the magnetic tape, wherein the digital video data generating means has an absolute address which is updated in units of three tracks in the digital video format. The recording means generates recording data, wherein the recording means generates the digital video format generated by the digital video data generating means, wherein the same absolute address is added to one track formed on the second magnetic tape. Characterized in that recording data for three tracks is continuously recorded in Recording device. 3. The method according to claim 1, wherein the recording data corresponding to the digital video format applied to the first magnetic tape having a tape width of 1/4 inch is recorded on the second magnetic tape having a tape width of 1/2 inch. A reproducing unit that reproduces the recorded data; and a digital video data processing unit that performs data processing of the recorded data reproduced by the reproducing unit.
From three tracks, recorded data for three tracks in the digital video format are continuously reproduced, and the digital video data processing means performs data processing using data for 60 tracks in the digital video format as a processing unit. Characteristic magnetic reproducing device. 4. A method according to claim 1, wherein the recording data corresponding to the digital video format applied to the first magnetic tape having a tape width of イ ン チ inch is recorded on the second magnetic tape having a tape width of イ ン チ inch. A reproducing means for reproducing the recorded data; and a digital video data processing means for processing data of the recorded data reproduced by the reproducing means. The second magnetic tape is updated in units of three tracks in the digital video format. Then, record data to which the same absolute address is added in one track formed on the second magnetic tape is recorded.
A magnetic reproducing apparatus for continuously reproducing recorded data of three tracks in the digital video format from one track.