JP2004295957A - Magnetic recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To record an MPEG compressed signal by an HD method and a DV compressed signal by an SD method on a DV tape simultaneously and select either of the methods freely to reproduce the DV tape. <P>SOLUTION: Two one-base 2-chip magnetic head devices are mounted on a rotary drum on which a magnetic tape is wound and fed, and the MPEG compressed digital signal by the HD method is supplied to one HD(E) and HD(O) out of the two head chips of magnetic head devices, and the DV compressed digital signal by the SD method is supplied to the other head chip SD(E) and SD(O). Then, their signal tracks are formed in one DV tape by means of a track recording pattern peculiar to the example to realize simultaneous recording. When specific reproduction is made, a trace signal on the track to which the DV compressed signal is decoded and outputted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method for recording a MPEG (Moving Picture Expert Group) compressed signal by a high-definition HD (High Definition) method and a DV (Digital Video) compressed signal by performing a DV (Digital Video) compressed signal by a standard SD (Standard Definition) method. The present invention relates to a magnetic recording / reproducing device that can be used.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a device that handles HD signals, a magnetic recording device that can record HD video data on a magnetic tape (hereinafter, referred to as a DV tape) in a DV standard format by MPEG compression has been proposed (for example, a magnetic recording device). , Patent Documents 1 to 3).
Further, a magnetic recording / reproducing apparatus has been proposed which enables reproduction in a reproduction mode of an SD system from a recording medium recorded in a recording mode of an HD system (for example, see Patent Document 4).
Further, there has been proposed a magnetic recording apparatus capable of inputting and recording an image signal of the SD system and an image signal of the HD system almost simultaneously (for example, see Patent Document 5).
[0003]
[Patent Document 1]
JP 2001-275076 A [Patent Document 2]
JP 2001-275077 A [Patent Document 3]
Japanese Patent Application Laid-Open No. 2002-77792 [Patent Document 4]
JP-A-6-339114 [Patent Document 5]
JP 2000-125245 A
[Problems to be solved by the invention]
However, as disclosed in Patent Documents 1 to 3 described above, when a signal according to the HD system is recorded on a current DV tape, the sector of servo data in one track on a recording track pattern in the HD system and the SD system is used. Since the position and the system are different, there is a problem that when a DV tape on which a video signal according to the HD system is recorded is reproduced by a conventional DV device, no image and sound are output and the tape is erroneously recognized as a non-recording tape.
Also, when recording an HD signal on a current DV tape, the sector position of the image search data in one track on the recording track pattern is fixed, so that even at the time of a special reproduction image, a specific tape speed is used. However, there is a problem that an image can only be output, and the image cannot be confirmed by fast-forwarding or the like as in a conventional DV device.
In addition, since recording and reproduction of only the HD system are performed with respect to one DV tape, an image of the conventional DV system is transmitted to a peripheral device using this DV tape, and when a confirmation or editing operation is performed. However, there is a problem that it is not possible to output in a timely manner with respect to use environments and conditions of various users.
It should be noted that those disclosed in Patent Documents 4 and 5 described above perform recording and reproduction using a special format, and do not use a magnetic tape according to the current DV format, but have general versatility and compatibility. There is a problem in that.
[0005]
Accordingly, an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of simultaneously recording an MPEG-compressed signal by the HD system and a DV-compressed signal by the SD system on one DV tape, and selecting and reproducing freely. It is in.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a rotary drum on which a magnetic tape is wound and fed, and a first azimuth angle mounted on the rotary drum and forming a recording track on the magnetic tape by an HD MPEG compression signal. And a second magnetic head mounted on the rotating drum and having a second azimuth angle for forming a recording track on the magnetic tape by an SD DV compression signal, the first magnetic head comprising: Forming a recording track by the second magnetic head in a state in which a part of the recording track by the recording medium overlaps, and forming a recording track by the first magnetic head in a state in which a part of the recording track by the second magnetic head overlaps. As a result, a recording track having a predetermined width by the MPEG compressed signal of the HD system and a predetermined width by the DV compressed signal of the SD system. And forming a recording track alternately.
[0007]
In the magnetic recording / reproducing apparatus according to the present invention, the first magnetic head and the second magnetic head are used to form a recording track pattern in which recording tracks of an HD MPEG compression signal and recording tracks of an SD DV compression signal are alternately arranged. Since it is formed, it is possible to simultaneously record the MPEG MPEG compression signal of the HD system and the DV compression signal of the SD system using the existing DV tape, and output the HD signal and the SD signal in real time during reproduction. It becomes possible. Further, at the time of special reproduction, reproduction similar to that of a current DV device can be performed, and image displacement and the like can be confirmed.
Further, the DV compressed signal recorded in the above-described recording track pattern can be reproduced as it is by the current DV device, and high compatibility can be obtained.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a magnetic recording / reproducing apparatus according to the present invention will be described.
The magnetic recording / reproducing apparatus according to the present embodiment has two one-chip two-chip type magnetic head devices mounted on a rotating drum on which a magnetic tape is wound and fed, and includes two head chips of each magnetic head device. An HD compressed MPEG digital signal is supplied to one head chip, and a SD DV compressed digital signal is supplied to the other head chip. In the following description, the four heads are described as HD (E), HD (O), SD (E), and SD (O). Here, (O) indicates an odd track, and (E) indicates an even track.
Then, both signal tracks are formed in one DV tape by a recording track pattern unique in this example, and simultaneous recording is enabled.
Also, at the time of special reproduction, a trace signal on a track on which a DV-compressed signal is recorded is decoded and output.
[0009]
FIG. 1 is an explanatory diagram showing a recording track by each head and a recording track pattern on a DV tape in a magnetic recording and reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a head arrangement and a track pitch of a rotating drum for realizing the recording track pattern shown in FIG.
The magnetic recording / reproducing apparatus of this example has a drum diameter of 21. Four heads HD (E), HD (O), SD (E), SD (O) are mounted on a recording system of 7 mm, a tape wrap angle of 174 degrees, and a tape relative speed of 18.831 mm, and these heads HD (E) , HD (O), SD (E), and SD (O), the four tracks shown in FIG. 1A are formed on the tape 100 as recording track patterns as shown in FIG. 1B.
FIG. 1A shows the relationship between each recording track and the rotation angle of the drum, and FIG. 1B shows the recording track pattern on the magnetic tape 100. The direction and arrow b indicate the track direction on the magnetic tape 100.
In this example, as shown in FIG. 1B, tracks of a high-quality HD MPEG-compressed RF signal and a current SD DV-compressed RF signal are recorded as one pair, and are recorded in two pairs. The recording track pattern is formed by repeating the steps.
[0010]
Next, a description will be given of a head configuration and specifications for realizing such a recording track pattern, and a track pitch.
In this example, each of the heads HD (E), HD (O), SD (E), and SD (O) also serves as a recording / reproducing device, and has two magnetic head devices each having one base and two chips. It is mounted on the rotating drum 120 as a unit of 110A and 110B.
Further, the two magnetic head devices 110A and 110B are configured to be mounted 180 degrees opposite to each other. The magnetic head devices 110A and 110B each having one base and two chips record an RF signal of which the first chip is HD MPEG-compressed on the tape 100, and extract the signal from the tape 100 at the time of reproduction. , HD (O).
The second chip is a magnetic head SD (E) or SD (O) that records the DV signal of the current SD which has been DV-compressed on the tape 100, and extracts this signal from the tape 100 during reproduction.
[0011]
The magnetic heads SD (E) and SD (O) using the SD RF signal as transmission means are mounted with a head having a head width of 12 μm in conformity with the azimuth angle of the current DV system.
On the other hand, the magnetic heads HD (E) and HD (O) using HD RF signals as transmission means have a head width of 12 μm and have an azimuth different from that of the SD type magnetic heads SD (E) and SD (O). It has a corner.
As shown in FIG. 2B, these heads generate MPEG RF signals by the relative speed similar to that of the current DV system and the difference in the relative height of the mounting positions in the magnetic head devices that are 180 degrees opposite to each other. The track 101A for recording is formed at a pitch of 7 μm, and the track 101B for recording the RF signal of DV has a pitch of 5 μm. It is formed as a pitch of 5 μm.
[0012]
Next, FIG. 3 is an explanatory diagram showing the configuration of the data sector in one track of the HD MPEG RF signal and the current SD DV RF signal.
As shown in FIG. 3A, the MPEG RF signal is the same as, for example, the one disclosed in Patent Document 3 described above, and details are omitted, but a preamble, an SSA (Start Sync Area), and a TIA (Track Information Area) are used. ), An insert and track information (ITI) sector 210 of a total of 3550 bits including a postamble, a main sector 220 of 128,975 bits for storing video / audio / AUX data / video data for search, and 1250 bits , A sub-code sector 230, a 1200-bit postamble sector 240, and a 1250-bit overwrite margin 250.
[0013]
On the other hand, as shown in FIG. 3B, the RF signal of the DV of the current SD conforms to the data sector of the current DV system, and details are omitted, but a preamble, an SSA (Start Sync Area), and a TIA are used. (Track Information Area), a 3600-bit Insert and Track Information (ITI) sector 310 including a postamble, a 625-bit gap G1, an 11550-bit audio sector 320 including a preamble, data, and a postamble, and 700. A video sector 330 having a total of 11225 bits including a gap G2 of bits, a preamble, data and a postamble, and a total including a gap G3 of 1550 bits and a preamble, data and a postamble 725 (or 3600) bits subcode sector 340, and a 1250-bit overwrite margin 350.
[0014]
Next, a digital recording / reproducing circuit for forming the data sector in one track as described above in the recording track pattern of this embodiment will be described.
FIG. 4 is a block diagram showing a configuration example of the magnetic recording / reproducing circuit of this example.
As shown in the figure, this recording / reproducing circuit includes a VD-based compression / expansion circuit (DV Expand / Compression Logic) 1, a VD-based encoder / decoder circuit (DV ENC / DEC Logic) 3, and an MPEG-based compression / expansion circuit. (MPEG Expand / Compression Logic) 2, an MPEG encoder / decoder circuit (MPEG ENC / DEC Logic) 4, a multiplex RF switching circuit (Multiplex RF Switcher) 5 for merging and separating DV and MPEG systems. , A recording / reproducing amplifier (REC / PB RF AMP) 6 for amplifying recording signals and reproducing signals, RF buffer circuits (RF Buffers) 7, 8, and a system controller (System Control) for controlling the entire system. Processor 9).
[0015]
Then, at the time of recording, a digital baseband signal input from the outside is compressed in the compression / expansion circuit 1 or 2, and is formed as a data sector as shown in FIG. Then, the signals are subjected to encoder processing in the encoder / decoder circuits 3 and 4 and are formed as RF signals.
Thereafter, the MPEG RF signal and the DV RF signal are supplied to the rotating drum 120 by the switching control of the multiplex RF switching circuit 5 at the timings shown in FIGS. Here, the switching control of the multiplex RF switching circuit 5 is controlled by the system controller 9.
Further, the RF signal subjected to this switching control operation is signal-processed by the recording amplification circuit of the recording / reproduction amplification circuit 6 and the recording RF buffer circuit 7 of the RF buffer circuits 7 and 8, and is stored on the tape 100.
[0016]
On the other hand, at the time of reproduction, the RF signal stored on the tape 100 at the time of recording is extracted from the rotating drum 120 and passes through the reproduction RF buffer circuit 8 of the RF buffer circuits 7 and 8 and the reproduction amplification circuit of the recording / reproduction amplification circuit 6, The signal is transmitted to each signal processing block of the MPEG signal and the DV signal.
At the time of this reproduction, an MPEG signal or a DV signal can be selected and reproduced by sending a selection signal to the system controller 9 by an external selection means such as a key operation.
That is, when reproducing the MPEG signal by the external selection means, the multiplex RF switching circuit 5 is switched to the MPEG output side by the system controller 9. After being subjected to MPEG decoding signal processing in the encoder / decoder circuit, MPEG expansion processing by the compression / expansion circuit and conversion into digital baseband, the signal is output as an HD signal.
When the DV signal is reproduced by the external selection means, the multiplex RF switching circuit 5 is switched by the system control device 9 to the DV output side. Then, the signal is subjected to DV decoding signal processing in an encoder / decoder circuit, subjected to DV expansion processing in a compression / expansion circuit, converted into digital baseband, and output as a current SD signal.
[0017]
Next, a description will be given of a case where the MPEG signal is output by performing special reproduction such as FF (fast-forward), REW (fast-reverse), and a search operation or a still operation thereof.
This is automatically switched to the DV output side by the multiplex RF switching circuit 5 by selecting each operation mode of the special reproduction, and thereafter, the DV signal is output in the same manner as the DV signal output means described above. You. As a result, the image can be confirmed by high-speed reproduction or the like as in the case of the current DV device.
[0018]
Next, a case where a magnetic tape recorded with the recording track pattern of the present example is reproduced by a current DV device will be described.
Since the data sector in the DV RF signal recorded as described above complies with the current DV system, the servo control operation according to the current DV system is performed on the SD and HD track centers as shown in FIG. By performing 5. 5 μm tracks can be traced.
That is, as shown in FIG. 5A, the rotary drum 500 of the current DV device is provided with one-chip type magnetic head devices 510A and 510B at 180 ° opposed positions, respectively, and each head SD (E) , SD (O) trace the track on the magnetic tape. The gap length of each of the heads SD (E) and SD (O) is 12 μm as shown in FIG. 5 (B), and the two tracks HD and SD are traced at one time. Only the track of the SD that has been set can be reproduced.
[0019]
According to the magnetic recording / reproducing apparatus of the present embodiment as described above, the following effects can be mainly obtained.
(1) It is possible to simultaneously record a high-quality HD MPEG compression signal and a current SD DV compression signal on a single tape with respect to the current tape.
(2) The high-quality HD signal and the current SD signal can be output in real time by the external selection means.
(3) Since the DV signal is automatically selected for DV reproduction during special reproduction, it is possible to freely check a moving image for each mode and for the selected tape speed.
(4) An SD signal can be output even when reproduced on a current DV device.
(5) The contents of the recorded tape can be confirmed even when reproduced on the current DV device, and it is possible to avoid erroneous erasure.
[0020]
【The invention's effect】
As described above, according to the magnetic recording / reproducing apparatus of the present invention, the recording track of the MPEG-compressed signal of the HD system and the recording track of the DV-compressed signal of the SD system are alternately formed using the first magnetic head and the second magnetic head. Since the arranged recording track patterns are formed, it is possible to simultaneously record the MPEG MPEG compression signal of the HD system and the DV compression signal of the SD system using the current DV tape, and to reproduce the HD signal during reproduction. It is possible to output an SD signal in real time, and it is also possible to perform reproduction similar to that of a current DV device even during special reproduction, so that image displacement and the like can be confirmed.
In addition, the DV compressed signal recorded in the above-described recording track pattern can be reproduced as it is by the current DV equipment, and high compatibility can be obtained, and the magnetic tape can be easily confirmed. There is an effect that it is possible to prevent erasing easily.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a recording track by each head and a recording track pattern on a DV tape in a magnetic recording and reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a head arrangement and a track pitch of a rotating drum for realizing the recording track pattern shown in FIG.
FIG. 3 is an explanatory diagram showing a configuration of a data sector in one track of an HD MPEG RF signal and a current SD DV RF signal used in a magnetic recording / reproducing circuit according to an embodiment of the present invention.
FIG. 4 is a block diagram illustrating a configuration example of a magnetic recording / reproducing circuit according to an embodiment of the present invention.
FIG. 5 is an explanatory diagram showing a principle of reproducing a magnetic tape recorded by a magnetic recording / reproducing circuit according to an embodiment of the present invention with a current DV device.
[Explanation of symbols]
1, 2 ... compression / expansion circuit, 3, 4 ... encoder / decoder circuit, 5 ... multiplex RF switching circuit, 6 ... recording / reproduction amplification circuit, 7, 8 ... RF buffer circuit, 9 ... system control Apparatus, 100: magnetic tape, 110A, 110B: magnetic head apparatus, 120: rotating drum.

Claims (8)

A rotating drum on which a magnetic tape is wound and fed;
A first magnetic head having a first azimuth angle mounted on the rotating drum and forming a recording track on the magnetic tape by an HD MPEG compression signal;
A second magnetic head having a second azimuth angle mounted on the rotating drum and forming a recording track on the magnetic tape by an SD DV compression signal;
A recording track formed by the second magnetic head is formed so as to partially overlap a recording track formed by the first magnetic head, and a recording track formed by the first magnetic head is formed so as to partially overlap a recording track formed by the second magnetic head. By forming recording tracks, recording tracks of a predetermined width by the MPEG compressed signal of the HD system and recording tracks of a predetermined width by the DV compression signal of the SD system are alternately formed.
A magnetic recording / reproducing apparatus characterized by the above-mentioned. Two magnetic head devices of one base and two chips are mounted on the rotating drum, and an MPEG compressed signal by the HD system is supplied to one of the two magnetic head chips of each magnetic head device, and the other magnetic head chip is supplied with the other magnetic head device. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein a DV compression signal according to the SD method is supplied to the head chip. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic tape is a DV standard tape. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the first magnetic head and the second magnetic head are recording / reproducing magnetic heads. 5. The magnetic recording / reproducing apparatus according to claim 4, wherein during special reproduction, a trace signal on a track on which the DV compression signal is recorded is decoded and output. 5. The magnetic apparatus according to claim 4, wherein a reproduction signal of an HD MPEG compression signal by the first magnetic head and a reproduction signal of an SD DV compression signal by the second magnetic head are selected and output. Recording and playback device. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the first azimuth angle of the first magnetic head and the second azimuth angle of the second magnetic head are non-reproducible azimuth angles. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the MPEG compressed signal has data sectors of video data, audio data, AUX data, video search data, and subcode data.

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