JPH07210801A - Magnetic recording and reproducing method - Google Patents

Abstract

PURPOSE:To fulfill functions of a VTR by suppressing an increase of heads. CONSTITUTION:The VTR of 270 deg. winding has audio heads A1, A2 having + or -30 deg. azimuth angle, video heads SP1, SP2 having + or -6 deg. azimuth angle, video heads WP1, WP2 and video heads WQ1, WQ2. The audio heads A1, A2 are commonly used in the standard time mode, long time mode and wide mode of VHS, by which the increases of the heads is suppressed and the size is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art Conventionally, a VHS method or S-VHS method is generally known as a helical scan type magnetic recording and / or reproducing apparatus (hereinafter abbreviated as "VTR") using a 1/2 inch width magnetic tape. Has been.

In these VTRs, especially in stationary VTRs which are not particularly required to be miniaturized, a magnetic tape is wound around a rotary drum by about 180 °. And ± 6 °
Standard time recording / playback image heads SP1 and SP2 having different azimuth angles, and long time recording / playback image heads EP1 and EP2 having different azimuth angles of ± 6 °.
Voice head A1, having different azimuth angles of 30 °
It was arranged on the rotary drum D shown in FIG. 18 (A) at a predetermined distance from A2. Then, the audio signal input to the VTR is frequency-modulated into a recorded audio signal, and the audio heads A1 and A2 are used to precede the video heads EP1 and EP2 or SP1 and SP2 to the deep portion of the magnetic layer of the magnetic tape T. The recording audio signals are sequentially recorded. On the other hand, of the luminance signal and color signal separated from the video signal input to the VTR,
The modulated luminance signal obtained by FM-modulating the former and the low-pass conversion color signal obtained by low-pass conversion of the latter are frequency-multiplexed to form a recording video signal, and the video heads EP1, EP2 or SP1, SP2 are used.
The recording video signal was superposed and recorded on the upper layer portion of the magnetic layer of the magnetic tape T subsequent to the audio heads A1 and A2. The video heads SP1 and SP2
Of the standard time mode has a track width of 58 μm, and EP1 and EP2 have a head width of 19 μm which is substantially the same as the track pitch of the long time mode.
Is. Here, the track pitch means the distance between the centers of adjacent tracks, and is a concept different from the track width forming a tape pattern. That is, when there is a guard band which is a non-recorded portion, the track pitch becomes larger than the track width.

According to the VHS standard, the audio heads A1 and A2, the video heads EP1 and EP2, and the video heads SP1 and SP2 satisfy at least the following conditions.

The recording time difference between the video signal and the audio signal recorded at the same location in the same track is the standard time mode, and the audio signal is recorded 0 to 2 fields ahead of the video signal, and the magnetic heads of those magnetic heads are recorded. The direction of azimuth angle must be opposite.

The recording time difference between the video signal and the audio signal recorded at the same location in the same track is the long time mode, and the audio signal is recorded 4/3 to 10/3 field ahead of the video signal, and these are recorded. The direction of the azimuth angle of the magnetic head in the above shall be the same direction.

In the standard time mode, the relationship between the video track and the audio track recorded at the same location in the same track is that the distance from the video track center to the upper or lower end of the audio track is 10 μm or more and 29 μm or less. thing.

In the long time mode, the relationship between the video track and the audio track recorded at the same location in the same track is that the audio track width is 16 μm or more and 19.3 μm or less from the upper end of the video track.

In the conventional VHS type VTR satisfying the conditions (1) to (4), the video signal and the audio signal are recorded and reproduced on one track.

In a camera-integrated VTR, which is strongly demanded to be smaller than a stationary VTR, the winding angle for winding the magnetic tape around the rotating drum is set to about 270 °, and the diameter of the rotating drum is reduced to 2/3. In addition, in order to maintain compatibility with the stationary VTR, the above conditions (1) to (4) were satisfied.

The arrangement of heads on the rotary drum in this camera-integrated VTR will be described with reference to FIG. In the figure, heads SP1-1 and SP1-2 are the above head SP1, heads SP2-1 and SP2-2 are the above head SP2, heads A1-1 and A1-2 are the above head A1, and heads A1 and A1-2 are the above head A1. A2-1 and A2-2 correspond to the above-mentioned head A2, respectively, and these heads are sequentially switched to obtain the magnetic tape pattern shown in FIG. In some cases, the head widths of SP1 and SP2 and SP2 and SP1 and SP2 are set to about 29 .mu.m, and both the standard time mode head and the long time mode head are used.

On the other hand, the applicant of the present invention discloses a magnetic recording / reproducing method for recording / reproducing three tracks as one set in order to improve the quality of audio signal after-recording and video signal quality, as described in JP-A-62-47292. I proposed earlier.

[0013]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In a VTR capable of recording / reproducing in a standard manner and capable of recording / reproducing as a set of three tracks, originally, the VH
In addition to the three sets of magnetic heads for the S system, three sets of magnetic heads for recording / reproducing three tracks as one set are newly required.

However, it is space-wise to dispose all of these magnetic heads on the rotary drum,
This is not preferable because it complicates the configuration.

Therefore, an object of the present invention is to solve such a problem by using a voice head for the VHS system as a newly required magnetic head.

[0016]

The present invention provides the following configurations in order to solve the above problems.

According to a first aspect of the present invention, magnetic heads are wound on a rotary drum wound at about 270 °, and adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position. A set of four heads attached to the VHS, and a combined voice head set for both the VHS standard time mode and the wide mode, and a set of predetermined angles behind each head constituting the combined voice head set, A first video head set used in the standard time mode of the VHS is a set of four heads having different azimuth angle directions between adjacent heads, separated from each other by 90 ° and attached at the same height position. A head and an ajima head that constitute the dual-use audio head set and the first video head set after being moved by a predetermined angle with respect to the respective heads that form the dual-use audio head set. Heads having different angles, different azimuth angle directions between adjacent heads, separated by 90 ° from each other, and attached at the same height position are set as a set, and are used for the wide mode. And a video recording unit for recording and reproducing video signals and audio signals on the magnetic tape using the dual-use audio head set and the first to third video head sets. It is provided.

According to a second aspect of the present invention, magnetic heads are wound on a rotary drum wound at about 270 °, the azimuth angle directions of adjacent heads are different from each other, they are separated from each other by 90 °, and they are at the same height position. A combined voice head set having four attached heads as a set, and a head that follows the heads of the combined voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions and are different from each other. A first video head set, which is a set of four heads, which are separated by 90 ° and are attached at the same height position, and a pair of heads that constitute the combined audio head set, and are moved by a predetermined angle. The azimuth angles are different from those of the heads constituting the combined audio head set and the first video head set,
A second video head set having a set of four heads having different azimuth angle directions between adjacent heads, separated from each other by 90 °, and attached at the same height position, and the combined audio head set The heads of the combined voice heads and the first head
Azimuth angles are different from the heads of the image head set, the adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position and below the second image head set. A third video head set including four heads mounted in proximity to each other is provided, and in the standard time mode of VHS, the preceding voice track is used in the deep portion of the magnetic tape by using the dual-use voice head set. After the formation, a trailing video track is formed on the surface layer portion related to the deep layer portion by using the first video head. On the other hand, in the wide mode, the track pitch and the substantially the same track pitch as in the standard time mode of the VHS are used. At a tape running speed that forms the same track angle and substantially the same rotating drum rotation speed, approximately 1 / the track pitch of the trailing video track.
An audio track having a track width of 3 is formed by using the dual-purpose audio head, and first and second video tracks each having a track width of approximately ⅓ of the track pitch of the succeeding video track. The present invention provides a magnetic recording / reproducing apparatus characterized by being formed by using a second and a third video head set.

According to a third aspect of the present invention, magnetic heads are wound on a rotary drum wound at about 270 °, and adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position. A combination voice head set including four heads attached to the head, and a head that is behind the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions. A first video head set including a set of four heads that are 90 ° apart from each other and are mounted at the same height position;
The heads of the dual-use audio head set are moved backward by a predetermined angle, and the heads of the dual-use audio head set and the first video head set have different azimuth angles, and adjacent heads are adjacent to each other. For a second video head set having a set of four heads having different azimuth angle directions and separated from each other by 90 ° and attached at the same height position, and for each head constituting the dual-use audio head set The heads of the dual-purpose audio head set and the first video head set are different in azimuth angle after the predetermined angle, and adjacent heads have different azimuth angle directions and are 90 ° apart from each other. A third video head set including four heads mounted at the same height position and below the second video head set at a distance of approximately 1/3 of the track pitch. In the VHS standard time mode, the preceding audio track is formed on the deep layer of the magnetic tape by using the dual-purpose audio head assembly, and the trailing video track is formed on the surface layer of the deep layer. No. 1 video head assembly, while in the wide mode, the tape running speed and substantially the same rotating drum rotation speed that form substantially the same track pitch and substantially the same track angle as the VHS standard time mode. Then, an audio track having a track width of about 1/3 of the track pitch of the succeeding video track is formed by using the dual-purpose audio head, and the track pitch of the succeeding video track is about 1/3 of the track pitch.
A magnetic recording / reproducing apparatus characterized in that first and second video tracks each having a track width of 3 are formed by using the second and third video head sets.

According to a fourth aspect of the present invention, magnetic heads are wound on a rotary drum wound about 270 °, the heads adjacent to each other have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position. A combination voice head set including four heads attached to the head, and a head that is behind the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions. A first video head set including a set of four heads that are 90 ° apart from each other and are mounted at the same height position;
The heads of the dual-use audio head set are moved backward by a predetermined angle, and the heads of the dual-use audio head set and the first video head set have different azimuth angles, and adjacent heads are adjacent to each other. For a second video head set having a set of four heads having different azimuth angle directions and separated from each other by 90 ° and attached at the same height position, and for each head constituting the dual-use audio head set The heads of the dual-purpose audio head set and the first video head set are different in azimuth angle after the predetermined angle, and adjacent heads have different azimuth angle directions and are 90 ° apart from each other. A third video head set including four heads mounted at the same height position and below the second video head set at a distance of approximately 1/3 of the track pitch. In the VHS standard time mode, the preceding audio track is formed in the deep layer of the magnetic tape by using the dual-purpose audio head set, and the trailing video track is formed in the surface layer of the deep layer. Is formed by using the image head assembly of
A track width of about 1/3 of the track pitch of the trailing video track at a tape running speed that forms a track pitch and a track angle that are substantially the same as those of the standard time mode of S and a rotation drum rotation speed that is substantially the same. Is formed by using the dual-purpose audio head set, and first and second video tracks each having a track width of approximately 1/3 of the track pitch of the succeeding video track are provided as the second and second video tracks. In the long time wide mode, the tape running speed and the substantially same rotating drum rotation speed are used to form the same track pitch and substantially the same track angle as the VHS long time mode. Forming a long-duration audio track having a track width of about 1/3 of the track pitch of the trailing video track using the dual-purpose audio head assembly Rutotomoni rear row third having a track width of approximately 1/3 of the track pitch of the video tracks,
There is provided a magnetic recording / reproducing apparatus characterized in that a fourth video track is formed by using the second video head set or the third video head set.

According to a fifth aspect of the present invention, magnetic heads are wound on a rotary drum wound at about 270 °, the azimuth angle directions of adjacent heads are different from each other, they are separated from each other by 90 °, and they are at the same height position. A combination voice head set including four heads attached to the head, and a head that is behind the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions. A first video head set including a set of four heads that are 90 ° apart from each other and are mounted at the same height position;
The heads of the dual-use audio head set are moved backward by a predetermined angle, and the heads of the dual-use audio head set and the first video head set have different azimuth angles, and adjacent heads are adjacent to each other. For a second video head set having a set of four heads having different azimuth angle directions and separated from each other by 90 ° and attached at the same height position, and for each head constituting the dual-use audio head set The heads of the dual-purpose audio head set and the first video head set are different in azimuth angle after the predetermined angle, and adjacent heads have different azimuth angle directions and are 90 ° apart from each other. A third video head set, which is a set of four heads mounted at the same height position and adjacent to the lower side of the second video head set, is a VHS standard. In the time mode, the preceding audio track is formed in the deep layer portion of the magnetic tape by using the dual-purpose audio head set, and the trailing video track is formed in the surface layer portion related to the deep layer portion by using the first video head. In the wide mode, the tape running speed and the substantially same rotating drum rotation speed that form substantially the same track pitch and substantially the same track angle as the standard time mode of the VHS,
An audio track having a track width of about 1/3 of the track pitch of the succeeding video track is formed by using the dual-purpose audio head set, and a track width of about 1/3 of the track pitch of the succeeding video track. Are formed by using the second and third video head sets, and V is set in the long time wide mode.
A track width that is approximately ⅓ of the track pitch of the trailing video track at a tape running speed that forms substantially the same track pitch and substantially the same track angle as in the HS long-time mode, and at substantially the same rotating drum rotation speed. Is formed using the dual-purpose audio head assembly, and the track pitch of the trailing video track is approximately 1 /
There is provided a magnetic recording / reproducing apparatus characterized in that third and fourth video tracks having a track width of 3 are formed by using the second video head set or the third video head set. It is a thing.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view for explaining the arrangement of heads on a rotary drum in one embodiment of a VTR according to the present invention,
2 is a block diagram for explaining a main part of a recording signal system of a VTR according to an embodiment of the present invention, FIG. 3 is a timing chart for explaining head selection in the first embodiment, and FIG. FIG. 5 is a block diagram for explaining a wide mode tape pattern of one embodiment, FIG. 5 is a block diagram for explaining a main part of a reproduction signal system of a VTR which is one embodiment according to the present invention, and FIG. 6 is a first embodiment. 7 is a timing chart for explaining head selection in the second embodiment, and FIG. 8 is a diagram for explaining a wide mode tape pattern in the second embodiment. FIG. 9 is a diagram for explaining the head mounting position in the second embodiment, and FIGS. 10 and 11 are detection diagrams for explaining the long time wide mode head mounting position in the second embodiment. FIG, 12 is 10, consider diagram for explaining a head mounting position to consolidate 11, FIG. 1
3 and 14 are views for explaining the head mounting position in the long time wide mode in the fourth embodiment, and FIG. 15 is a view for explaining the head mounting position by integrating FIGS. 13 and 14. 16 is a plan view for explaining the head arrangement on the rotary drum in the first embodiment, and FIG. 17 is a plan view for explaining the head arrangement on the rotary drum in the second embodiment. Hereinafter, embodiments will be described with reference to the drawings.

In the VTR according to this embodiment, three tracks are recorded at substantially the same tape running speed and substantially the same rotary drum rotation speed that form substantially the same track pitch and substantially the same track angle as in the VHS standard time mode. Form a tape pattern to be paired. Further, since the track widths of a set of these three tracks are set to be substantially equal to each other, they are approximately 1/3 of the track pitch (58 μm) in the standard time mode (mode of recording / reproducing in SP1 and SP2), which is approximately 19 μm.
Becomes Then, one audio-only track for audio dubbing and two video tracks are provided.
These three tracks will be recorded or reproduced. Hereinafter, this mode will be referred to as a wide mode.

In this embodiment, a set of VHS type video heads SP1-1, SP2-1, SP2 (first video head set) is provided and audio heads A1-1, A2 are used.
-1,2 (combined audio head set) is also used for the wide mode, and as shown in FIGS. 1 (A) and 1 (B), WP1-1,2, WP2-1,2 are newly added as video heads. Set (second
Image head assembly) and WQ1-1,2, WQ2-1,2 assembly (third image head assembly) are arranged on the rotary drum D. The head width of SP1-1, SP2, SP2 in the figure may be 29 .mu.m. In this case, these heads are also used as EP1-1, EP2, EP2. It will be.

Here, the audio heads A1-1, A, A in a combination of heads for recording / reproducing a signal of one field
The first embodiment and the second embodiment can be considered from the relationship between 2-1, 2 and the video heads WP1-1, 2, WP2-1-2, and the video heads WQ1-1, 2, WQ2-1-2. 1A corresponds to the first embodiment, and FIG. 1B corresponds to the second embodiment. Further, regarding the relationship of the head mounting height, for example, FIG.
FIG. 17 corresponds to the second embodiment, respectively.

If the high-definition video signal to be recorded / reproduced in the wide mode is a high-definition signal (the recording of NTSC signal of 59.94 Hz at the standard tape speed is also one of the wide modes), Since the field frequency is 60 Hz, it is slightly different from the field frequency of the conventional NTSC signal of 59.94 Hz, and therefore the drum rotation cycle for one rotation in one field cycle is slightly different. However, since the tape running speeds are the same in both, there is almost no change in the servo system, and the range is negligible when obtaining the tape pattern. Therefore, it is assumed in the following description that the two match.

(First Embodiment) Signal System The signal system of the VTR according to this embodiment will be described with reference to FIGS. FIG. 2 shows a recording signal system of a VTR according to the present embodiment, in which a magnetic tape TT compatible with a conventional VHS system is prepared, and a conventional NTSC signal is recorded by two programs or a high-definition video signal ( For example, a high-definition signal such as a MUSE signal) is divided into two and recorded.

Here, to describe the case of recording the long-time mode of the conventional VHS system, the audio signal a1 and the video signal cc are recorded by the recording FM audio processing means 1 and the recording VHS video processing means from a transmission line (not shown). 5 and 5, respectively. Then, the recorded FM audio processing means 1 performs a process such as pre-emphasis and FM-modulates the recorded audio signal 1 a, which is supplied to the first switch circuit 3. When recording in the long-time mode, the first switch circuit 3 outputs the recording audio signal 1a to the audio heads A1-1, A2, A2-1, 2 via the first head selecting means 4. Supply each, EP1-1,2, E
Recording is performed on the deep layer portion of the magnetic tape TT prior to P2-1, 2.

The recording VHS image processing means 5 separates an image signal into a color signal and a luminance signal in the same manner as in the above-mentioned conventional technique, and performs a predetermined recording process to obtain a low-frequency converted color signal and FM. A recording video signal 5a obtained by frequency-multiplexing a modulated luminance signal is supplied to the video heads EP1-1, EP2, EP2-1, 2 through the fourth head selecting means 6 and recorded on the surface layer of the magnetic tape TT. To do.

On the other hand, in the wide mode, the high definition video signal bb
, The audio signal a2 and the high-definition video signal c
c is supplied to the recording PCM voice processing means 2 and the dividing means 7 from a transmission line (not shown). Then, the recording PCM audio processing means 2 supplies the recording circuit PCM audio signal 2a to which the error correction code such as the Reed-Solomon code is added and the modulation such as the four-phase DPSK can be performed to the first switch circuit 3. When the first switch circuit SW1 records in the wide mode, the recording PCM audio signal 2a is recorded.
Through the first head selecting means 4 to the voice heads A1-1,
2, A2-1,2, WP1-1,2, WP2-1,2 and W
Recording on the magnetic tape TT precedes Q1-1, 2 and WQ2-1, 2.

In the dividing means 7, the high definition video signal b
b is divided into, for example, two types of signals for each scanning line to obtain first and second divided signals 7a and 7b, and the band is divided into 1 /
I have set it to 2. Of course, so-called TCI processing may be performed during this division. Then, the first and second divided signals 7a and 7b are supplied to the second and third switch circuits 8 and 9, and when the high-definition video signal bb is recorded here, the first and second divided signals 7a are supplied. , 7b are respectively selected and supplied to the first and second recorded image processing means 10 and 11. The first and second recorded image processing means 10 and 11
The recorded image processing such as emphasis and FM modulation is performed to obtain the first and second recorded image signals 10a and 11a. Then, the first and second recorded video signals 10a and 11a are transmitted through the second and third head selecting means 12 and 13 to WP1-
It is supplied to 1,2, WP2-1,2 and WQ1-1,2, WQ2-1,2 and recorded on the magnetic tape TT.

Furthermore, when two NTSC video signals are recorded in the wide mode, audio signals a2 and a3 are recorded.
And the first and second video signals b1 and b2 are supplied to the recording PCM audio processing means 2 and the second and third switch circuits 8 and 9. In the recording PCM voice processing means 2, the voice signal a2,
The signal obtained by performing the above-described processing on a3 is time-division-multiplexed or frequency-multiplexed to obtain a recorded PCM audio signal 2a. Further, the second and third switch circuits 8 and 9 selectively output the first and second video signals b1 and b2 and supply them to the first and second recording video signal processing means 10 and 11, respectively. After processing, two programs are recorded on the magnetic tape TT.

In the recording signal system described above, a discrimination signal for discriminating whether the recording signal is a high-definition video signal or two-program recording is recorded by inserting it in the vertical blanking period of the video signal. I decided to. Further, the discrimination signal may be recorded by changing the duty ratio of the control signal.

In this way, as shown in FIG.
A tape pattern is formed with one set of three tracks per field, and the operation of the first to third head selecting means 4, 12, and 13 which is the gist of the technique will be described with reference to the timing chart shown in FIG. . In addition, conventional VHS
The operation in the long time mode is well known and will not be described.

In FIGS. 3A to 3H, FIGS. 3A to 3H illustrate a period in which the head disposed on the rotary drum shown in FIG. 1A contacts the magnetic tape TT and a period in which the magnetic tape TT is valid. It is a thing. The high-level period is the period in which the magnetic tape TT is in contact, and the period shown by the thick line in that period is the valid period. The period between the dotted lines in the figure corresponds to the rotation period of the rotary drum of 45 °. Here, the valid period is a period during which a signal to be recorded is supplied to the head during recording, and a period during which reproduction processing is performed based on the signal reproduced by the head during reproduction. Say. That is, even during the high-level period, the head is the magnetic tape T during the period not shown by the thick line.
This is a period in which recording / reproduction is not performed, although it is in contact with T. From FIGS. 4A to 4H, the first to third head selecting means 4, 12 and 13 respectively select the heads shown in FIGS. You are getting a tape pattern to do.

Next, the reproduction signal system of the VTR according to this embodiment will be described with reference to FIG. A case will be first described in which the discrimination signal is detected by the discrimination signal detecting means (not shown) and a result that the conventional VHS system long-time mode is obtained is obtained. The signals reproduced by the audio heads A1-1, A2, A2-1, 2 are supplied to the reproduction FM audio processing unit 21 via the first head selecting unit 4 and the fourth switch circuit 20, where the FM is generated. demodulation,
Audio signal a1 that has been subjected to reproduction processing such as de-emphasis
Is reproduced and output to a transmission line (not shown). Also, the video head E
The signals reproduced from P1-1, 2 and EP-1,2 are supplied to the reproduction VHS image processing means 23, and the image signal cc which has been subjected to the well-known reproduction processing is reproduced and output to a transmission line (not shown).

On the other hand, when the discrimination result of the discrimination signal is the high-definition video signal, the signals reproduced by the audio heads A1-1, A2, A2-1-2 are the first head selecting means 4, the fourth head. Is supplied to the reproduction PCM voice processing means 22 via the switch circuit 20 and the voice signal a2 which has been subjected to 4-phase DPSK demodulation, error correction, etc. is reproduced and output to a transmission line (not shown). The signals reproduced by the video heads WP1-1, WP2-1, 2 are supplied to the first reproduced video processing means 24 via the second head selecting means 12 and the video heads WQ1-
The signals reproduced from 1, 2, WQ 2-1, 2 are supplied to the second reproduced image processing means 25 via the third head selecting means 13. Then, the first and second reproduced video processing means 24,
At 25, the first and second divided signals, which have been subjected to reproduction video processing such as FM demodulation and de-emphasis, are complementary to the dividing means 7 via the fifth and sixth switch circuits 26 and 27. It is supplied to the synthesizing means 28. Then, the synthesizing means 28 reproduces and outputs the high-definition video signal bb obtained by synthesizing the first and second divided signals to a transmission line (not shown).

Further, when the discrimination result of the discrimination signal indicates that the NTSC system video signal is reproduced by two programs, the signal reproduced from the audio heads A1-1, A2, A2-1 is the first signal. The audio signals a2 and a3 which are supplied to the reproduction PCM audio processing means 22 via the head selecting means 4 and the fourth switch circuit 20 and which have been subjected to 4-phase DPSK demodulation, error correction and the like and which have been divided are provided. It is reproduced and output to a transmission line (not shown). Also, the first and second reproduced video processing means 24, 2
The first and second divided signals reproduced from No. 5 are reproduced and output to the transmission path (not shown) as the first and second video signals b1 and b2 via the fifth and sixth switch circuits 26 and 27. .

Head mounting position Referring to FIG. 6, the audio heads A1-1,2, A2-1,2 and the video heads WP1-1,2, WP2-1-2, and the video heads WQ1-1,2,
In consideration of the mounting positions of WQ2 and WQ2, the figure shows a case where the locus of the lower edge of the video head WP1 and the locus of the upper edge of the video head WQ2 coincide with each other.
In the figure, the subscripts “1,2” of the head represent the azimuth angle, the one represented from the upper right to the lower left is “1”, and the one represented from the upper left to the lower right is “2”. Further, the mounting position of the video head SP1 for the standard time mode is used as the origin of the coordinates (angle “0 °”, height “0 μm”). Further, the head subscript "-1" or "-2" is also used when the subscript of one head is "-1" in the combination of the audio head and the video head. It is "-1", and when the subscript of one head is "-2" in the combination of the audio head and the video head, the subscript of the other head is also "-2". The subscript "" or "-2" is omitted.

Here, a video head WP1 newly added
Find the mounting position of. The video heads WP1 and WP
2 and the azimuth angles of the video heads WQ1 and WQ2 are different from those of the audio heads A1 and A2, the video heads SP1 and SP2, and the video heads EP1 and EP2. The reference line SPTC (VHS SP.Cent.) Shown in the figure shows the track center of the video head SP1 for the standard time mode, where "SPTP" is one track pitch for the standard time mode. Since it has a slope of “SPTP” per 180 ° and the Y-intercept is SPTP / 2, it can be expressed by Equation 1.

[0041]

[Equation 1] The straight line AA including the lower edge of WP1 attached to the lower side of A2 is SPTP in the negative direction of the reference line SPTC.
The straight line AA can be expressed by Equation 2 because it is moved in parallel to the Y axis of / 2 μm.

[0042]

[Equation 2] Further, the straight line BB including the lower edge of WQ2 attached to the lower side of WP1 has a straight line AA of EPTP μm, where EPTP is the track pitch and track width of WP1 and WQ2.
Since it is translated in the negative direction with respect to the Y axis,
The straight line BB can be expressed by Equation 3.

[0043]

[Equation 3] The maximum mountable range of WP1 and WQ2 is such that the audio signal is prerecorded with respect to the video signal and A1 and A2 are set to V.
Since it is also used as HS, A2 precedes SP1 described in the VHS standard by two fields. Therefore, WP1 may be attached to the area "a" shown by a thick frame in the figure, while WQ2 may be attached to the area "b".

Then, by mounting WP2 at a position that is the same height as WP1 and separated by 180 °, and by mounting WQ1 at a position that is the same height as WQ2 and is separated by 180 °, the VHS audio heads A1, A2 are obtained. It can also be used as a dual mode voice head.

The locus of the lower edge of WP1 and WQ2
Since it is arranged so that the upper end edge locus of the same coincides with the tape pattern, crosstalk between video tracks can be suppressed. Further, since the lower end edge locus of the video head SP1 for the standard time mode, the lower end edge locus of WP1 and the upper end edge locus of WQ2 are arranged on the tape pattern, the magnetic head can be easily attached to the rotary drum. Become. That is, usually, the heads are mounted by temporarily fixing a plurality of heads, inserting the rotary drum into a jig so that the rotary drum can rotate about its rotation axis, and confirming with a microscope from the direction perpendicular to the rotation axis. While adjusting the height. Therefore, by disposing the magnetic head as described above, a desired head can be brought within the same visual field of the microscope simply by rotating the rotary drum.

Although the directions of the azimuth angles of the adjacent tracks have been described as being opposite to each other as shown in FIG. 4, the present invention is not limited to this, and it goes without saying that the directions may be the same. Of course, the head widths of the magnetic heads WP1 and WP2 and the magnetic heads WQ1 and WQ2 may exceed the track width, and in this case also, as described above, the video head SP1 for the standard time mode. It is desirable to dispose the lower edge locus of (1), the lower edge locus of WP1 and the upper edge locus of WQ2 on the tape pattern.

The above is the case where the locus of the lower edge of WP1 and the locus of the upper edge of WQ2 coincide with each other on the tape pattern, but more generally, when the both do not coincide, the above equations 2 and 3 are as follows. The numbers 4 and 5 are obtained. However, β
Is an offset value in the track pitch direction (Y-axis direction) of the track lower end of VHS-SP and the straight line AA.

[0048]

[Equation 4]

[0049]

[Equation 5] Thus, the VTR according to the present embodiment can record and reproduce the video signal according to the NTSC system by the conventional VHS system, and can record and reproduce the high-definition video signal or the video signal according to the NTSC system by two programs. is there.

(Second Embodiment) In the second embodiment, one field is formed in the wide mode 3 as shown in FIG.
The tracks are set so that the audio-only tracks related to the audio heads A1 and A2 are inserted in the video tracks, and the rotary drum shown in FIG. 1B is used. Further, in the first embodiment, SP1, SP2 and A
Due to the VHS standard relationship with 1 and A2, the video track of one field related to the video heads SP1 and SP2 for the VHS standard time mode did not match the three tracks constituting one field in the wide mode. In the second embodiment, they can be matched, and as a result, the flying erase head for the VHS standard time mode can also be used for the wide mode.

Signal system The signal system of the second embodiment differs from the signal system of the first embodiment in the operation of the first to third selecting means 4, 12, and 13, and this point will be described in detail. However, other explanations are omitted. 7, (A) to (H) of FIG. 7 illustrate a period in which the head disposed on the rotary drum shown in FIG. 2 (B) is in contact with the magnetic tape TT and a valid period. . The high-level period is the period in which the magnetic tape TT is in contact, and the period shown by the thick line in that period is the valid period. The period between the dotted lines in the figure corresponds to the rotation period of the rotary drum of 45 °. Here, the valid period is a period during which a recording current is supplied to the head during recording, and a period during which reproduction processing is performed based on a signal reproduced by the head during reproduction. . That is,
Even during the high level period, a period not shown by a thick line is a period in which the head is in contact with the magnetic tape TT but recording / reproduction is not performed. 8A to 8H, the first to third head selecting means 4, 12 and 13 respectively select the heads shown in FIGS. You are getting a tape pattern to do. Head mounting position Using FIG. 9, the audio heads A1 and A2 and the video head WP
1, WP2 and the mounting positions of the video heads WQ1 and WQ2 will be examined. In the figure, the subscripts “1,2” of the head represent the azimuth angle, the one represented from the upper right to the lower left is “1”, and the one represented from the upper left to the lower right is “2”. Further, the mounting position of the video head SP1 for the standard time mode is used as the origin of the coordinates (angle “0 °”, height “0 μm”). Further, the head subscript "-1" or "-2" is also used when the subscript of one head is "-1" in the combination of the audio head and the video head. It is "-1", and when the subscript of one head is "-2" in the combination of the audio head and the video head, the subscript of the other head is also "-2".
The subscript "-1" or "-2" is omitted.

Here, the mounting position of the video head WQ1 newly added below the audio head A2 is determined. The reference line SPTC (VHS SP.Cent.) Showing the track center of the video head SP1 for the standard time mode can be expressed by the equation 6 as in the equation 1 as described above.

[0053]

[Equation 6] Then, the straight line CC including the lower edge of WQ1 attached to the lower side of A2 matches the above-described straight line AA, and can be expressed by Expression 7 as in Expression 2.

[0054]

[Equation 7] In addition, the straight line DD including the lower edge of WP1 attached to the upper side of A2 is a straight line CC in the positive direction of 2 EPTP μm.
The straight line DD can be expressed by Equation 8 because it is moved parallel to the axis.

[0055]

[Equation 8] The maximum mountable range of WP1 and WQ1 is such that the audio signal is recorded before the video signal and A1 and A2 are set to V.
Since it is also used as HS, A2 precedes SP1 described in the VHS standard by two fields. Therefore, WQ1 should be attached to the area “C” shown by the thick frame in the figure, while WP1 should be attached to the area “D”.

Then, by mounting WP2 at a position which is the same height as WP1 and is separated by 180 °, and by mounting WQ2 at a position which is the same as WQ1 and is separated by 180 °, the VHS type voice heads A1, A2 are provided. It can also be used as a wide mode voice head.

Further, the video head SP for the standard time mode
Since the lower edge trace of 1 and the lower edge trace of WQ1 and the upper edge trace of the video head SP1 and the upper edge trace of WP1 are arranged on the tape pattern, a microscope is used as in the first embodiment. All heads can be attached easily.

Although the directions of the azimuth angles of the adjacent tracks have been described as being opposite to each other as shown in FIG. 6, the present invention is not limited to this, and the directions may be the same or opposite to each other. Of course. Further, it goes without saying that the head widths of the magnetic heads WP1 and WP2 and the magnetic heads WQ1 and WQ2 may exceed the track width.
Also in this case, as described above, the bottom edge locus of the video head SP1 and the bottom edge locus of WQ1 and the top edge locus of the video head SP1 and the top edge locus of WP1 for the standard time mode are matched on the tape pattern. It is desirable to dispose it because it can be easily attached.

The above is the case where the upper edge locus of SP1 and the upper edge locus of WP1, and the lower edge edge locus of SP1 and the lower edge edge locus of WQ1 match on the tape pattern. Similarly, if the two do not match, the above equations 7 and 8 are generally the following equations 9 and 10. However, β is an offset value in the track pitch direction (Y-axis direction) of the track lower end of VHS-SP and the straight line CC.

[0060]

[Equation 9]

[0061]

[Equation 10] (Third Embodiment) In the first and second embodiments described above,
The track pitch and the tape running speed forming the track angle are substantially the same as those of the VHS standard time mode,
In order to record and reproduce the wide mode and the VHS system in which three tracks are set as one set at substantially the same drum rotation speed, the audio heads A1 and A2 are used in both modes and the video head W is used.
The VTR newly added with P1 and WP2 and the video heads WQ1 and WQ2 has been described. On the other hand, the third embodiment further uses the video heads WP1 and WP2 and the video heads WQ1 and WQ2 to set the tape traveling speed to be substantially the same as the long-time mode of the VHS system and the wide mode to the substantially same drum rotation speed. It realizes a long-time wide mode with a long time.

Here, in the long time wide mode, the audio signal is pre-recorded and reproduced similarly to the above-described long time mode of the VHS system, and then the video signal is recorded and reproduced in the same track. The audio signal is the audio head A.
1 and A2, and video signals are video heads WP1 and WP2
Alternatively, either one of the image heads WQ1 and WQ2 is used. That is, the voice heads A1 and A
Reference numeral 2 is a head which is used in both the standard time mode, the long time mode, the wide mode and the long time wide mode of the VHS system. The third embodiment will be described below with reference to FIGS.

First, in the case where the recording time difference between SP1 and A2 is 0 field, the video head W will be described with reference to FIG.
The mounting positions of P1 and WP2 and the video heads WQ1 and WQ2 will be examined. In the figure, a track having a steep slope is a track related to wide mode, while a track having a gentle slope is a track related to wide mode for a long time. Since it is necessary to attach WP1 and WQ1 to a position where both tracks can be formed, the region "e" shown by the thick frame in the figure is the attachable position, while the region "f" is the attachable position for WP1. Become.

That is, WQ1 is approximately 22.5 ° with respect to A2.
+ (N-1) * 270 ° (where N is a natural number) The maximum reproduction output can be obtained by mounting at a subsequent angular position. Similarly, WP1 is approximately 22.5 ° + N * 2 with respect to A2.
The maximum reproduction output can be obtained by mounting at an angle position that follows 70 ° (where N is a natural number). Also, A2
On the other hand, based on A1 which is the reverse azimuth, the mounting position of WQ2 that can obtain the maximum reproduction output is approximately 22.5 ° + (N-1) * 270 ° (where N is a natural number). Yes, the mounting position of WP2 is about 22.5
° + N * 270 ° (where N is a natural number).

Next, in the case where the recording time difference between SP1 and A2 is 2 fields, the video head W will be described with reference to FIG.
The mounting positions of P1 and WP2 and the video heads WQ1 and WQ2 will be examined. Also in this case, as in the case of the 0 field, the area "G" shown by the thick frame in the figure is the attachable position for the WQ1, while the area "H" is the attachable position for the WP1. The regions "e" to "h" shown in FIGS. 10 and 11 can be specified by obtaining the intersections of the straight lines as in the first and second embodiments.

Now, integrating the case of 0 field and the case of 2 field described above results in FIG.
In Q1, the region "ri" shown by the thick frame in the figure is the attachable position, while in WP1, the region "nu" is the attachable position.

Then, by mounting WP2 at a position that is the same height as WP1 and separated by 180 °, and by mounting WQ2 at a position that is the same as WQ1 and is separated by 180 °, the VHS audio heads A1, A2 are obtained. It can also be used as a wide mode head for a long time.

(Fourth Embodiment) The third embodiment described above corresponds to the second embodiment, but the fourth embodiment is the first.
The present invention relates to the long time wide mode corresponding to the embodiment, and includes the video heads WP1 and WP2 and the video head WQ1.
WQ2 is used to extend the wide mode for a long time at the same tape running speed and the same drum rotation speed as the VHS long time mode.

Here, in the long time wide mode, the audio signal is pre-recorded and reproduced as in the above-described long time mode of the VHS system, and then the video signal is recorded and reproduced on the same track. The audio signal is the audio head A.
1 and A2, and video signals are video heads WP1 and WP2
Alternatively, one of the video heads WQ1 and WQ2 is used. That is, the voice heads A1 and A2 are heads that are used in both the standard time mode, the long time mode, the wide mode, and the long time wide mode of the VHS system. The fourth embodiment will be described below with reference to FIGS. 13 to 15.

First, in the case where the recording time difference between SP1 and A2 is 0 field, the video head W will be described with reference to FIG.
The mounting positions of P1 and WP2 and the video heads WQ1 and WQ2 will be examined. In the figure, a track having a steep slope is a track related to wide mode, while a track having a gentle slope is a track related to wide mode for a long time. Since WQ1 must be attached at a position where both tracks can be formed, the area "L1,
2 "is the mountable position. Here, the area "wo" cannot be pre-recorded in the wide mode with the head width of A2 shown in the figure. Further, even if the head width of A2 is widened and pre-recording is possible, it is erased by A1 which follows 180 degrees. It is not a possible position. On the other hand, in WP1, the areas “wa 1 to w 3” are the attachable positions. here,
The vertices P1 to P4 of the parallelogram region “L1, L2, W1 to W3” are obtained.

The vertices P1 to P4 of the area 1 are two straight lines L
It suffices to find the intersection of 1 and L2. The straight line for finding the vertex P1 is the following equations 11 and 12, and the straight line for finding the vertex P2 is the following equations 13 and 14
The straight line for obtaining the apex P3 is the following Equation 15 and Equation 1
6, and the straight line for obtaining the vertex P4 is the following equations 17 and 18.

[0072]

[Equation 11]

[0073]

[Equation 12]

[0074]

[Equation 13]

[0075]

[Equation 14]

[0076]

[Equation 15]

[0077]

[Equation 16]

[0078]

[Equation 17]

[0079]

[Equation 18] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are set, they can be generally expressed by the following formulas 19 to 26 rather than the above formulas 11 to 18.

[0080]

[Formula 19]

[0081]

[Equation 20]

[0082]

[Equation 21]

[0083]

[Equation 22]

[0084]

[Equation 23]

[0085]

[Equation 24]

[0086]

[Equation 25]

[0087]

[Equation 26] Here, SPTP = 57.8 μm, Y ₀ = 0 °, ΔAV
= 3.22 μm, X ₁ = −157.0 °, Y
_{1 = -14.4μm, X 2 = -22.5} °, Y 2 = 1
4.4 μm, X ₃ = 112 °, Y ₃ = 24.0 μm, X
₄ = -22.5 °, it becomes Y ₄ = -4.8μm.

Further, the vertices P1 to P4 of the area 1 may be obtained by finding the intersections of the two straight lines L1 and L2, and the straight lines for finding the vertex P1 are the following equations 27 and 28.
The straight line for obtaining 2 is the following equations 29 and 30, and the straight line for obtaining the vertex P3 is the following equation 31,
Equation 32, and the straight lines for obtaining the vertex P4 are Equation 33 and Equation 34 shown below.

[0089]

[Equation 27]

[0090]

[Equation 28]

[0091]

[Equation 29]

[0092]

[Equation 30]

[0093]

[Equation 31]

[0094]

[Equation 32]

[0095]

[Expression 33]

[0096]

[Equation 34] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{From 1 to} Y ₄ , it can be generally expressed by the following expressions 35 to 42 from the above expressions 27 to 34.

[0097]

[Equation 35]

[0098]

[Equation 36]

[0099]

[Equation 37]

[0100]

[Equation 38]

[0101]

[Formula 39]

[0102]

[Formula 40]

[0103]

[Formula 41]

[0104]

[Equation 42] Here, SPTP = 57.8 μm, Y ₀ = 0 °, ΔAV
= 3.22 μm, X ₁ = −427.0 °, Y
_{1 = -33.6μm, X 2 = -292.5} °, Y 2 = -
4.8 μm, X ₃ = -158.0 °, Y ₃ = 4.7 μm
m, X ₄ = −292.5 ° and Y ₄ = −24.0 μm.

The vertices P1 to P4 of the area w 2 may be obtained by finding the intersections of the two straight lines L1 and L2. The straight lines for finding the vertex P1 are the following equations 43 and 44,
The straight line for obtaining 2 is the following equations 45 and 46, and the straight line for obtaining the vertex P3 is the following equation 47,
The straight line for obtaining the vertex P4 is the following equations 49 and 50. The ASP in the number 46 is VH.
S. SP. This is the width of the voice head below Cent.

[0106]

[Equation 43]

[0107]

[Equation 44]

[0108]

[Equation 45]

[0109]

[Equation 46]

[0110]

[Equation 47]

[0111]

[Equation 48]

[0112]

[Equation 49]

[0113]

[Equation 50] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are set, they can be generally expressed by the following expressions 51 to 58 rather than the above expressions 43 to 50.

[0114]

[Equation 51]

[0115]

[Equation 52]

[0116]

[Equation 53]

[0117]

[Equation 54]

[0118]

[Equation 55]

[0119]

[Equation 56]

[0120]

[Equation 57]

[0121]

[Equation 58] Here, SPTP = 57.8 μm, Y ₀ = 0 °, ΔAV
= 3.22 μm, X ₁ = −426.0 °, Y
_{1 = -72.0μm, X 2 = -291.5} °, Y 2 = -
43.2 μm, X ₃ = -157.0 °, Y ₃ = -33.
6 μm, X ₄ = −291.5 °, Y ₄ = −62.4 μm
Becomes

Further, the vertices P1 to P4 of the area 2 may be obtained by finding the intersections of the two straight lines L1 and L2.
The straight line for obtaining 2 is the following equations 61 and 62, and the straight line for obtaining the vertex P3 is the following equation 63,
The straight line for finding the vertex P4 is the following equations 65 and 66.

[0123]

[Equation 59]

[0124]

[Equation 60]

[0125]

[Equation 61]

[0126]

[Equation 62]

[0127]

[Equation 63]

[0128]

[Equation 64]

[0129]

[Equation 65]

[0130]

[Equation 66] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are used, the following expressions 67 to 74 can be generally expressed from the above expressions 59 to 60.

[0131]

[Equation 67]

[0132]

[Equation 68]

[0133]

[Equation 69]

[0134]

[Equation 70]

[0135]

[Equation 71]

[0136]

[Equation 72]

[0137]

[Equation 73]

[0138]

[Equation 74] Here, SPTP = 57.8 μm, Y ₀ = 0 °, ΔAV
= 3.22 μm, X ₁ = −696.1 °, Y
_{1 = -91.2μm, X 2 = -561.5} °, Y 2 = -
62.4 μm, X ₃ = -427.0 °, Y ₃ = -52.
8 μm, X ₄ = −561.5 °, Y ₄ = −81.6 μm
Becomes

The vertices P1 to P4 of the area w 3 may be obtained by finding the intersections of the two straight lines L1 and L2. The straight lines for finding the vertex P1 are the following equations 75 and 76, and the vertex P
The straight line for obtaining 2 is the following Equations 77 and 78, and the straight line for obtaining the vertex P3 is the following Equation 79,
The straight line for obtaining the vertex P4 is the following equation 81 and equation 82.

[0140]

[Equation 75]

[0141]

[Equation 76]

[0142]

[Equation 77]

[0143]

[Equation 78]

[0144]

[Equation 79]

[0145]

[Equation 80]

[0146]

[Equation 81]

[0147]

[Equation 82] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{From 1 to} Y ₄ , the following formulas 83 to 90 can be generally expressed from the above formulas 75 to 82.

[0148]

[Equation 83]

[0149]

[Equation 84]

[0150]

[Equation 85]

[0151]

[Equation 86]

[0152]

[Equation 87]

[0153]

[Equation 88]

[0154]

[Equation 89]

[0155]

[Equation 90] Here, SPTP = 57.8 μm, Y ₀ = 0 °, ΔAV
= 3.22 μm, X ₁ = −695.0 °, Y
₁ = -129.6 μm, X ₂ = -560.5 °, Y ₂ =
-100.8 μm, X ₃ = -426.0 °, Y ₃ = -9
1.2 μm, X ₄ = −560.5 °, Y ₄ = −120.
It becomes 0 μm.

Next, in the case where the recording time difference between SP1 and A2 is 2 fields, the video head W will be described with reference to FIG.
The mounting positions of P1 and WP2 and the video heads WQ1 and WQ2 will be examined. In this case as well, as in the case of the 0 field, the area “F” shown by the thick frame in the figure is the attachable position in WQ1. Here, since the area "Yo" precedes A1, WQ1 cannot be attached. On the other hand, in WP1, the area "TA1, TA2" is the attachable position.

The vertices P1 to P4 of the area Y are two straight lines L1,
It suffices to find the intersection of L2, and the straight line for finding the vertex P1 is the following formulas 91 and 92, and the straight line for finding the vertex P2 is the following formulas 93 and 94 for finding the vertex P3. The following straight line is for the following formulas 95 and 96, and the straight line for obtaining the vertex P4 is the following formula 9
7, the number is 98.

[0158]

[Formula 91]

[0159]

[Equation 92]

[0160]

[Equation 93]

[0161]

[Equation 94]

[0162]

[Formula 95]

[0163]

[Equation 96]

[0164]

[Numerical Expression 97]

[0165]

[Equation 98] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are used, the following formulas 99 to 106 can be generally expressed from the above formulas 91 to 98.

[0166]

[Numerical expression 99]

[0167]

[Equation 100]

[0168]

[Equation 101]

[0169]

[Equation 102]

[0170]

[Equation 103]

[0171]

[Equation 104]

[0172]

[Equation 105]

[0173]

[Equation 106] Here, SPTP = 57.8 μm, Y ₀ = 134.7
, ΔAV = 0 μm, X ₁ = 268.8 °,
Y ₁ = 115.4 μm, X ₂ = 403.3 °, Y ₂ = 1
44.1 μm, X ₃ = 537.8 °, Y ₃ = 153.7
μm, X ₄ = 403.3 °, and Y ₄ = 124.9 μm.

The vertices P1 to P4 of the area pattern 1 are two straight lines L.
It is only necessary to find the intersection of 1 and L2, and the straight lines for finding the vertex P1 are the following equations 107 and 108.
The straight line for obtaining 2 is the following equations 109 and 110
And the straight line for obtaining the vertex P3 is the following Equation 1
11, the equation 112, and the straight lines for obtaining the vertex P4 are the equations 113 and 114 shown below.

[0175]

[Equation 107]

[0176]

[Equation 108]

[0177]

[Equation 109]

[0178]

[Equation 110]

[0179]

[Equation 111]

[0180]

[112]

[0181]

[Equation 113]

[0182]

[Equation 114] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are set, they can be generally expressed by the following Expressions 115 to 122 than the above Expressions 107 to 114.

[0183]

[Equation 115]

[0184]

[Equation 116]

[0185]

[Expression 117]

[0186]

[Equation 118]

[0187]

[Equation 119]

[0188]

[Equation 120]

[0189]

[Equation 121]

[0190]

[Equation 122] Here, SPTP = 57.8 μm, Y ₀ = 134.7
, ΔAV = 0 μm, X ₁ = 269.8 °,
Y ₁ = 77.0 μm, X ₂ = 404.3 °, Y ₂ = 10
5.8 μm, X ₃ = 538.8 °, Y ₃ = 115.4 μ
m, X ₄ = 404.3 ° and Y ₄ = 86.6 μm.

The vertices P1 to P4 of the area f are two straight lines L1,
It suffices to find the intersection of L2, and the straight lines for finding the vertex P1 are the numbers 123 and 124 shown below, and the straight lines for finding the vertex P2 are the numbers 125 and 126 shown below, and the vertex P3 is found. The straight line for
7 and 128, and the straight line for obtaining the vertex P4 is 129 and 130 shown below.

[0192]

[Equation 123]

[0193]

[Equation 124]

[0194]

[Equation 125]

[0195]

[Equation 126]

[0196]

[Equation 127]

[0197]

[Equation 128]

[0198]

[Numerical Expression 129]

[0199]

[Equation 130] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are used, the following formulas 131 to 138 can be generally expressed from the formulas 123 to 130.

[0200]

[Equation 131]

[0201]

[Equation 132]

[0202]

[Expression 133]

[0203]

[Equation 134]

[0204]

[Equation 135]

[0205]

[Equation 136]

[0206]

[Equation 137]

[0207]

[Equation 138] Here, SPTP = 57.8 μm, Y ₀ = 134.7
, ΔAV = 0 μm, X ₁ = −0.2 °, Y
₁ = 57.8 μm, X ₂ = 134.3 °, Y ₂ = 86.
6 μm, X ₃ = 268.8 °, Y ₃ = 96.1 μm, X
₄ = 134.3 ° and Y ₄ = 67.3 μm.

The vertices P1 to P4 of the area 2 may be obtained by finding the intersections of the two straight lines L1 and L2. The straight lines for finding the vertex P1 are the following equations 139 and 140, and the vertex P2 is obtained. The straight line for is the following equation 141, equation 1
42, the straight line for obtaining the vertex P3 is the following equations 143 and 144, and the straight line for obtaining the vertex P4 is the following equations 145 and 146.

[0209]

[Equation 139]

[0210]

[Equation 140]

[0211]

[Expression 141]

[0212]

[Equation 142]

[0213]

[Numerical Expression 143]

[0214]

[Expression 144]

[0215]

[Equation 145]

[0216]

[Expression 146] Then, X of the vertices P1 to P4, a Y-coordinate X ₁ to X _4, Y
_{When 1 to} Y ₄ are set, they can be generally expressed by the following expressions 147 to 154 rather than the above expressions 139 to 140.

[0217]

[Expression 147]

[0218]

[Equation 148]

[0219]

[Equation 149]

[0220]

[Equation 150]

[0221]

[Expression 151]

[0222]

[Equation 152]

[0223]

[Expression 153]

[0224]

[Equation 154] Here, SPTP = 57.8 μm, Y ₀ = 134.7
, ΔAV = 0 μm, so X ₁ = 0.8 °, Y ₁
= 19.4 μm, X ₂ = 135.1 °, Y ₂ = 48.2
μm, X ₃ = 259.4 °, Y ₃ = 57.7 μm, X ₄
= 135.1 ° and Y ₄ = 29.0 μm.

Now, when the above-mentioned case of 0 field and case of 2 field are integrated, the result is shown in FIG.
P1 has an attachable position in the area “S” indicated by a thick frame in the figure, while WQ1 has an attachable position in the area “LE”.

Then, by mounting WP2 at a position that is the same height as WP1 and separated by 180 ° and by mounting WQ1 at a position that is the same height as WQ2 and is separated by 180 °, the VHS audio heads A1 and A2 are obtained. It can also be used as a wide mode head for a long time.

Incidentally, in the above-mentioned first to fourth embodiments,
Video heads WP1, WP2 or video heads WQ1, WQ
2 Set the azimuth angle of either one to ± 6 °,
Needless to say, the azimuth angle of the other set may be set to ± 15 °, and the one set may be used also as the magnetic head for the VHS system long-time mode.

In order to find the head mounting position that can be used in both the wide mode and the long time wide mode, the field frequency was calculated as 60 Hz in the wide mode. However, this head mounting position is in the case of a field frequency of 59.94 Hz, which is a kind of wide mode (for example, EDTV2 signal is recorded as a high definition video signal, or NTSC signal is recorded by a magnetic head of 2 programs WP and WQ, respectively). Although there are some differences from the head mounting position that can be commonly used in the case of the wide mode for a long time, the values are very close.

In the above-mentioned first to fourth embodiments, the video heads WQ2, WP1 and the video heads WP2, WQ1 are mounted adjacent to each other in order to save the mounting space of the magnetic head. Of course, WQ2 may be attached to the rear side of the rotary drum in the rotational direction, and WQ1 may be attached to the rear side of WP2 in the rotary drum rotational direction.

[0230]

As described above, according to the configurations of the present invention described in claims 1 to 3, it is compatible with the conventional VHS system and is suitable for recording and reproducing a high definition video signal. The magnetic recording / reproducing apparatus having the wide mode can be provided. Further, since the rotary drum wound around 270 ° can be used, the diameter of the rotary drum can be reduced to 2/3 of that of the case wound around 180 °, and a magnetic recording / reproducing apparatus suitable for a camera-integrated VTR is provided. There is an effect that it can be provided. Also, the combined voice head assembly is V
Since the standard time mode and the wide mode of HS can be used in common, it is possible to reduce the number of magnetic heads by four compared with the case where they are not used, and as a result, a space for mounting many heads on the rotary drum can be easily secured. Further, there is an effect that adjustment at the time of mounting the head can be facilitated.

According to the configuration of the present invention described in claim 4 or claim 5 as described above, in addition to the above effects,
Since the dual-use voice head assembly is used even in the wide mode for a long time, it is possible to reduce the number of magnetic heads by eight compared to the case where the dual-use voice head is not used. It has a remarkable effect in terms of ease.

[Brief description of drawings]

FIG. 1 is a plan view for explaining an arrangement of heads on a rotary drum in an embodiment of a VTR according to the present invention.

FIG. 2 is a block diagram for explaining a main part of a recording signal system of a VTR which is an embodiment according to the present invention.

FIG. 3 is a timing chart for explaining head selection in the first embodiment.

FIG. 4 is a diagram for explaining a wide mode tape pattern according to the first embodiment.

FIG. 5 is a block diagram for explaining a main part of a reproduction signal system of a VTR which is an embodiment according to the present invention.

FIG. 6 is an examination diagram for explaining a head mounting position in the first embodiment.

FIG. 7 is a timing chart for explaining head selection in the second embodiment.

FIG. 8 is a diagram for explaining a wide mode tape pattern according to a second embodiment.

FIG. 9 is an examination diagram for explaining a head attachment position in the second embodiment.

FIG. 10 is an examination diagram for explaining a long time wide mode head mounting position in a second embodiment.

FIG. 11 is an examination diagram for explaining a long time wide mode head mounting position in the second embodiment.

FIG. 12 is an examination diagram for explaining a head attachment position by integrating FIGS. 10 and 11;

FIG. 13 is an examination diagram for explaining a long time wide mode head mounting position in a fourth embodiment.

FIG. 14 is an examination diagram for explaining a long time wide mode head mounting position in a fourth embodiment.

FIG. 15 is an examination diagram for explaining a head attachment position by integrating FIGS. 13 and 14;

FIG. 16 is a plan view for explaining the head arrangement on the rotary drum in the first embodiment.

FIG. 17 is a plan view for explaining the arrangement of heads on the rotary drum in the second embodiment.

FIG. 18 is a diagram for explaining a conventional technique.

[Explanation of symbols]

A1-1,2, A2-1,2 audio head (combined audio head) SP1-1,2, SP2-1,2 video head (first video head assembly) WP1-1,2, WP2-1,2 Video head (second video head assembly) WQ1-1,2, WQ2-1,2 Video head (third video head assembly) TT Magnetic tape

Claims (5)

[Claims] 1. A magnetic tape is mounted on a rotary drum wound around approximately 270 ° at heads having different azimuth angle directions between adjacent heads and spaced 90 ° from each other and at the same height position. 4 heads as a set, VH
The dual-purpose voice head set which is used for both the standard time mode and the wide mode of S, and the heads which are arranged behind the respective heads of the dual-use voice head set are moved by a predetermined angle, and the adjacent heads have different azimuth angle directions. A set of four heads, which are separated from each other by 90 ° and attached at the same height position, is used as a set.
The first video head set used in the S standard time mode and the heads of the dual-use audio head set are moved backward by a predetermined angle to form the dual-use audio head set and the first video head set. Each head has a different azimuth angle, adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are mounted at the same height position as a set of four heads, which are used for the wide mode. A second and a third video head set, wherein the dual-use audio head set and the first to third video head sets are used to record and reproduce video signals and audio signals on the magnetic tape. Magnetic recording / reproducing device. 2. A magnetic tape is mounted on a rotary drum wound around approximately 270 ° at different head azimuth angles between adjacent heads and at 90 ° apart from each other and at the same height position. A combination voice head set having four heads as a set, and a head that follows the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions and are separated from each other by 90 °. And the first video head set including four heads mounted at the same height position as one set, and the heads constituting the dual-use audio head set are moved backward by a predetermined angle to obtain the dual-purpose audio The head set and the heads of the first video head set have different azimuth angles, and adjacent heads have different azimuth angle directions and are separated from each other by 90 ° and are the same. A second video head set including a set of four heads mounted at one height position, and a head that is behind the heads of the combined audio head set by a predetermined angle, The heads of the first image head set have different azimuth angles, the adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position, and the second image head set. And a third video head set that is a set of four heads that are mounted close to each other underneath, and in the standard time mode of VHS, the preceding voice track is provided in the deep portion of the magnetic tape. , And then a trailing video track is formed on the surface layer portion related to the deep layer by using the first video head, while in the wide mode, the standard time mode of the VHS is set. An audio track having a track width of approximately ⅓ of the track pitch of the succeeding video track at the tape running speed and the substantially same rotating drum rotation speed that form substantially the same track pitch and substantially the same track angle is recorded. The first and second video tracks, which are formed by using the dual-purpose audio head and have a track width of approximately 1/3 of the track pitch of the trailing video track, are formed by using the second and third video head sets. A magnetic recording / reproducing apparatus characterized in that the magnetic recording / reproducing apparatus is formed as follows. 3. A magnetic tape is mounted on a rotary drum wound around about 270 ° at different head azimuth angles between adjacent heads and at 90 ° apart from each other and at the same height position. A combination voice head set having four heads as a set, and a head that follows the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions and are separated from each other by 90 °. And the first video head set including four heads mounted at the same height position as one set, and the heads constituting the dual-use audio head set are moved backward by a predetermined angle to obtain the dual-purpose audio The head set and the heads of the first video head set have different azimuth angles, and adjacent heads have different azimuth angle directions and are separated from each other by 90 ° and are the same. A second video head set including a set of four heads mounted at one height position, and a head that is behind the heads of the combined audio head set by a predetermined angle, The heads of the first image head set have different azimuth angles, the adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position, and the second image head set. Below the track pitch is approximately 1
And a third video head set that is a set of four heads that are mounted apart from each other, and in the standard time mode of VHS, the preceding voice track is provided in the deep portion of the magnetic tape. Then, a trailing video track is formed on the surface layer portion related to the deep layer by using the first video head set, while in the wide mode, a track substantially the same as the standard time mode of the VHS. At a pitch and a tape running speed that forms substantially the same track angle and substantially the same rotating drum rotation speed,
An audio track having a track width of about 1/3 of the track pitch of the succeeding video track is formed by using the dual-purpose audio head, and a track width of about 1/3 of the track pitch of the succeeding video track is formed. A magnetic recording / reproducing apparatus, characterized in that the first and second video tracks respectively provided are formed by using the second and third video head sets. 4. A magnetic tape is mounted on a rotary drum wound around approximately 270 ° at different heights of adjacent heads from each other with different azimuth angle directions and at 90 ° apart from each other and at the same height position. A combination voice head set having four heads as a set, and a head that follows the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions and are separated from each other by 90 °. And the first video head set including four heads mounted at the same height position as one set, and the heads constituting the dual-use audio head set are moved backward by a predetermined angle to obtain the dual-purpose audio The head set and the heads of the first video head set have different azimuth angles, and adjacent heads have different azimuth angle directions and are separated from each other by 90 ° and are the same. A second video head set including a set of four heads mounted at one height position, and a head that is behind the heads of the combined audio head set by a predetermined angle, The heads of the first image head set have different azimuth angles, the adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position, and the second image head set. Below the track pitch is approximately 1
And a third video head set that is a set of four heads that are mounted apart from each other, and in the standard time mode of VHS, the preceding voice track is provided in the deep portion of the magnetic tape. Then, a trailing video track is formed on the surface layer portion related to the deep layer by using the video head set of 1. In the wide mode, the track pitch is substantially the same as that of the standard time mode of the VHS. At a tape running speed that forms the same track angle and substantially the same rotating drum rotation speed, approximately 1 / the track pitch of the trailing video track.
An audio track having a track width of 3 is formed using the combination audio head set, and first and second video tracks each having a track width of about 1/3 of the track pitch of the succeeding video track are formed. In the long time wide mode, the tape is formed using the second and third video head sets, and the tape running speed and the substantially same rotation are formed to form the same track pitch and substantially the same track angle as the VHS long time mode. At the drum rotation speed, the track pitch of the trailing video track is approximately 1
Long-duration audio tracks having a track width of / 3 are formed by using the dual-purpose audio head set, and third and fourth video tracks having a track width of approximately 1/3 of the track pitch of the succeeding video tracks. A magnetic recording / reproducing apparatus, wherein the magnetic recording / reproducing device is formed by using the second video head set or the third video head set. 5. A magnetic tape is mounted on a rotary drum wound around approximately 270 ° at different head azimuth angles between adjacent heads and at 90 ° apart from each other and at the same height position. A combination voice head set having four heads as a set, and a head that follows the heads of the combination voice head set by a predetermined angle, and the adjacent heads have different azimuth angle directions and are separated from each other by 90 °. And the first video head set including four heads mounted at the same height position as one set, and the heads constituting the dual-use audio head set are moved backward by a predetermined angle to obtain the dual-purpose audio The head set and the heads of the first video head set have different azimuth angles, and adjacent heads have different azimuth angle directions and are separated from each other by 90 ° and are the same. A second video head set including a set of four heads mounted at one height position, and a head that is behind the heads of the combined audio head set by a predetermined angle, The heads of the first image head set have different azimuth angles, the adjacent heads have different azimuth angle directions, are separated from each other by 90 °, and are at the same height position, and the second image head set. And a third video head set, which is a set of four heads mounted in close proximity to the lower side of the magnetic tape, in the VHS standard time mode, the preceding audio track is provided in the deep portion of the magnetic tape. After forming by using the head assembly, a trailing video track is formed by using the first video head on the surface layer portion related to the deep layer, and in the wide mode, it is almost the same as the standard time mode of the VHS. Tape running speed and substantially the same rotary drum rotating velocity for forming a track pitch and track angle of substantially the same one, substantially of the track pitch of the rear row visual track 1 /
An audio track having a track width of 3 is formed using the combination audio head set, and first and second video tracks each having a track width of about 1/3 of the track pitch of the succeeding video track are formed. In the long time wide mode, the tape is formed using the second and third video head sets, and the tape running speed and the substantially same rotation are formed to form the same track pitch and substantially the same track angle as the VHS long time mode. At the drum rotation speed, the track pitch of the trailing video track is approximately 1
Long-duration audio tracks having a track width of / 3 are formed by using the dual-purpose audio head set, and third and fourth video tracks having a track width of approximately 1/3 of the track pitch of the succeeding video tracks. A magnetic recording / reproducing apparatus, wherein the magnetic recording / reproducing device is formed by using the second video head set or the third video head set.