JPS6282502A - Magnetic recording system - Google Patents

Abstract

PURPOSE:To improve the magnetic recording efficiency and also to prevent the crosstalk by recording simultaneously the 1st and 2nd information signals to different tracks in the same track scan period, switching the positions of both tracks alternately for each track scan period and at the same time setting different azimuth angles among all adjacent tracks where the information signals are recorded. CONSTITUTION:Four rotary heads Y2, Y1, C2 and C1 are successively attached at and after the heighest part in the height direction of a rotor D. The track width is set at 29mum, for example, for heads Y1 and Y2 respectively. Therefore the lower end of the 3rd head Y1 is set at the same level as the upper end of the 4th head Y2. While the lower end of the 2nd head C2 is set at the same level as the upper end of the 3rd head Y1. At the same time, the azimuth angles of both heads C2 and Y2 are set at +6 deg., for example, together with those of both heads C1 and Y1 set at -6 deg. respectively. A wide guard band is provided between different adjacent tracks where the information signals are recorded. Furthermore these adjacent tracks have azimuth angles adverse to each other. Thus the crosstalk is effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording system, and particularly to a magnetic recording method using a rotating head.
This invention relates to a method for recording and forming book tracks separately and simultaneously on a magnetic recording medium.

2. Prior Art Currently, helical scan type magnetic recording and reproducing devices (VTR's) that use 1x2 inch wide magnetic tape have a relatively narrow recording/reproducing band for home use. The luminance signal of the carrier color signal is frequency-modulated to become a frequency-modulated wave, and the carrier color signal is converted into a low-pass converted carrier color signal, which is then frequency-division multiplexed to the frequency-modulated luminance signal, and this frequency-division multiplexed signal is Magnetic Chi 1 ″Fi!+ @Lts Z″ReFf!16
．． P'R'''.1'' 5-recording/playback system is adopted, and in order to improve tape usage efficiency, the guard panless recording system is used in which the azimuth angle of each rotating head for recording adjacent tracks is different. is adopted. On the other hand, commercial VTRs intended for broadcasting, especially VTRs with built-in cameras, have the same tape width as home VTRs in order to make the device smaller and lighter and to improve the quality of reproduced color video signals. A method is adopted in which the luminance signal and chrominance signal are recorded on separate tracks using separate rotating heads on magnetic tape, and a guard band is provided between adjacent tracks for recording and playback. .

Figures 7 and 8 show the above-mentioned conventional camera-integrated VT.
Each side of the recorded track pattern is shown in R. In FIG. 7, tracks 2+ and 22 are inclined with respect to the longitudinal direction of the magnetic tape 1.

23 are tracks on which frequency modulated luminance signals (hereinafter referred to as FM luminance signals) are recorded, and tracks 3+
, 32 and 33 are frequency-division multiplexed and recorded 1st and 2nd frequency-modulated color difference signals (hereinafter referred to as FM color difference signals) obtained by separately frequency modulating separate carrier waves with a color difference signal of 1.0. This is a truck that has been. Tracks 21 and 3
1 is a track in which the FM 1 degree signal and FM color difference signal of the same field are recorded simultaneously and separately, and similarly, tracks 22 and 3z, 23 and 33 are the tracks in which the FM luminance signal and FM color difference signal of the same field are recorded, respectively. are tracks recorded simultaneously and separately. Furthermore, tracks 21-2
The plurality of rotating heads that record and form 3.31 to 33 all have the same azimuth angle, and a guard band (signal non-recording zone) is formed between adjacent tracks. In addition, in FIG. 7, 41 and 42 are the first. An audio track on which the audio signal of the second channel is recorded, 5 a control track formed by a control head, and 6 a time code track formed by a time code head.

On the other hand, on the magnetic tape 7 shown in FIG. 8, there are inclined tracks 8+, 82.9+, 92 and first . Audio tracks 101 and 102 of the second channel, a time code track 11, and a control track 12 are recorded, respectively. Recording tracks 81 and 82 are formed by rotating heads 13a and 13b shown in FIG. 9 with an azimuth angle of -15°.
Recording tracks 91 and 92 are tracks on which FM time-base compressed color difference signals are recorded by rotary heads 14a and 14b with dimensions shown in FIG. 9 at an azimuth angle of +15°. Here, the FM time axis compressed color difference signals are color difference signals (R-Y) and (B-Y
) is compressed to 1/2, time-division multiplexed alternately every H/2 (where H is the horizontal scanning period), and the carrier wave is frequency-modulated using this time-division multiplexed signal. It is.

The two first rotating heads 13a and 13b have an azimuth angle of -15°, and the two second rotating heads have an azimuth angle of +15°.
After recording the tracks 81 and 91 simultaneously and separately using the rotary heads 14a and 14b, the next one is recorded.
Tracks 82 and 92 are simultaneously and separately recorded in the field, and thereafter, two tracks are recorded in the same manner. Furthermore, truck 8t, 82.91.9
Guard bands are formed between 62 adjacent tracks of 2 to avoid mutual crosstalk.

In a color video signal recording and reproducing apparatus using the 3'lY/C separate recording and reproducing method that forms either of the track patterns shown in FIGS. 7 and 8 above, the luminance signal and color difference signal are recorded on separate tracks. Since this is recorded and played back, F
Moiré, which occurs when an MIIi intensity signal and a low-signal conversion carrier chrominance signal are simultaneously recorded and reproduced on the same track on a non-linear transmission magnetic tape, does not occur, and both the luminance signal and chrominance signal recording and reproduction bands can be recorded and reproduced. In addition, since the low frequency conversion carrier color signal is not recorded biased by the FM luminance signal, the S/N of the reproduced color difference signal is
(signal-to-noise ratio), and from the above, it is possible to obtain a reproduced color video signal of higher image quality than that of a VTR using the low-frequency conversion color recording and reproduction method.

Problems to be Solved by the Invention However, the above-mentioned conventional color video No. e recording and reproducing device has the following problems:
In both cases, a guard band is provided, so there is a problem in that the efficiency of using the magnetic tape is poor. Also, if the rotating head crosses the guard band and scans adjacent tracks during playback, the FM luminance signal and FM color difference signal are recorded separately on the two adjacent tracks, so
The FM color difference signal (or FM brightness signal) is reproduced by the brightness signal rotary head (or the color difference signal rotary head), and there is no field correlation between the reproduced signals of both tracks, so the low frequency conversion color described above It is not possible to use a crosstalk cancellation method that uses field correlation, as is done with home-use VTRs that use the recording/playback method, and there is also the problem that crosstalk becomes noticeable in the reproduced image. Ta.

Therefore, we developed a device (AST:
A method of reducing the above-mentioned crosstalk using an TraCkin (1) can be considered, but in this case, there are problems such as an additional mechanism and circuit for such a device, resulting in a significant increase in cost. was there.

Furthermore, VTRs using the Y/C5) separation recording and reproducing method described above are not compatible with the VTRs using the low-frequency conversion color recording and reproducing method described above, and even the generally widespread low-frequency converting color recording and reproducing method is compatible with a single unit. It is desirable that the device be able to select and record/reproduce at will.

Therefore, in the present invention, recording is performed on the track where the first information signal is recorded and the track where the second information signal is recorded separately and simultaneously in the same track scanning period, and the arrangement of the respective track is determined by scanning each track. The above-mentioned problem is solved by switching alternately in the longitudinal direction of the tape every period and by making the azimuth angles between all adjacent tracks on which the same and different information signals are recorded different. Therefore, it is an object of the present invention to provide a magnetic recording system that satisfies the above requirements by also performing recording using a low frequency conversion color recording and reproducing system.

Means for Solving the Problems The magnetic recording system according to the present invention includes first and second rotating heads mounted at different heights at opposite positions on the rotating surface of a rotating body, and a rotating head of a rotating body. The first and second rotary heads are mounted at different heights at opposite positions on the surface, and the first and second rotary heads are mounted close to each other in the direction of rotation of the rotary body, and The first information signal is transmitted to the first and second rotary heads having gaps of different azimuth angles among the third and fourth rotary heads respectively mounted at different heights in the axial direction. At the same time, the second information signal is supplied to the third and fourth rotary heads having gaps of mutually different azimuth angles, and during one track scanning period, the first and third rotary heads having gaps of the same azimuth angle mutually. First and second tracks having a pattern interval of at least one field between each other are formed separately and substantially simultaneously by a rotating head, and the next one track scanning period has a gap of the same azimuth angle. separate third and fourth tracks having a pattern spacing of at least one field between each other by second and fourth rotating heads;
It is configured to repeat formation almost simultaneously. Furthermore, the system of the present invention employs the above-mentioned magnetic recording method as a first recording mode, and on the other hand, uses two rotary heads consisting of the first and second rotary heads or the third and fourth rotary heads. The second recording mode in which tracks on which three information signals are recorded are sequentially formed one by one and the first recording mode are selectively performed.

Action The first record above! 7! In some cases, adjacent first information signal recording tracks recorded and formed by the first and second rotary heads and adjacent second information signal recording tracks recorded and formed by the third and fourth rotary heads. In this case, recording is performed with a very small guard band or without providing a guard band, and between adjacent first and fourth tracks on which mutually different information signals are recorded, and between adjacent second tracks where different information signals are recorded.
Recording is performed with wide guard bands provided between the third and third tracks.

Furthermore, since the second recording mode is the same recording method as the magnetic recording method of the current VTR using the low frequency conversion color recording and reproducing method, the present invention enables the q conversion with the VTR using the low frequency converting color recording and reproducing method. You can measure your sexuality.

Embodiment FIGS. 1 (Δ) and (8) show an actual example of the arrangement of the rotary head, which is the main part of the magnetic recording system according to the present invention. Before explaining the arrangement of the rotary head, etc., an embodiment of a recording apparatus that implements the method of the present invention will first be described with reference to a block system diagram shown in FIG.

In Figure 2, selector switches SW+, SW2 and S
W3 is connected to the contact a side when recording by the Y/C separation recording method (in the first recording mode), and is connected to the contact a side when recording by the low frequency conversion color recording method (in the second recording mode). ) is switched and connected to the contact side. Also,
39 fast FM modulators.

39R carrier frequency and bandpass filter 401° 40R
The passage characteristics of are configured to be changed to predetermined values in response to switching of the changeover switches SW+ to SW3, respectively. First, to explain the case where recording is performed using the Y/C separation recording method, in FIG.
Here, frequency selection, demodulation, etc. are performed, and as shown in FIG.
) and two types of color difference signals RY and B-Y as shown in (B) of the same figure. Luminance signal YG
j; It has a wider band than the luminance signal recorded by the low-pass conversion color recording paleogenetic method, and the low-pass filter 17.j; Pre-emphasis circuit 18. The signals are supplied to the FM modulator 20 through white/dark (W/D) clip circuits 19, where they are frequency modulated to have a carrier wave shift band of 5MH7 to 6HIl.
It is converted into a frequency modulated luminance signal (FM luminance signal) of about z. This FM luminance signal is passed through the recording amplifier 21 to contact a of switch SW2 and contact a of switch SW3.
supplied to

In addition, unlike the conventional low-frequency conversion color recording and playback method,
No high-pass filter is required on the output side of the FM modulator 20.

This is because only the FM luminance signal is recorded on one track.

On the other hand, the above color difference signals R-Y and B-Y are filtered through the low-pass filter 2.
2.23. Clamp circuits 24, 25, pre-emphasis circuits 26, 27, white-dark clip circuit 28.
29 to the FM modulator 30.31. As a result, the first FM color difference signal is taken out from the FM modulator 30, and the second FM color difference signal is taken out from the FM modulator W4 31. These first and second FM color difference signals are passed through a t4 band filter 32. The signal is fed through a low-pass filter 33 to an adder 34, where it is frequency-division multiplexed and fed through a recording amplifier 35 to rotary heads C+ and C2, respectively.

Further, the input composite color video signal is transmitted to a conventional recording circuit 3.
6, where it undergoes recording signal processing using a conventionally well-known low frequency conversion color recording and reproducing method and is converted into a third frequency division multiplexed signal consisting of an FMXi degree signal and a low frequency conversion carrier color signal. Contact point of switch SW2 and switch S
Supplied to contact W3.

Furthermore, the left channel audio signal that entered the input terminal 37L and the right channel audio signal that entered the input terminal 37R are
Pre-emphasis circuit 38L.

38R, FM modulator 39L, 39R and bandpass filter 4
01.40R to the adder 41, where it is frequency division multiplexed. A first frequency division multiplexed signal consisting of first and second frequency modulated audio signals (FM audio signals) is provided to a common contact of the switch S W +.

Here, since the switches S W + to S W 3 are connected to the contact a as described above during Y/C separation recording, the above first frequency division multiplexed signal is connected to the switch S W
+ to the adder 34, where the first
and a second FM color difference signal, respectively, to generate a second frequency division multiplexed signal. This second frequency division multiplexed signal is passed through the recording amplifier 35 to the rotary head C1.
and C2, respectively. Further, the FMTi degree signal taken out from the recording amplifier 21 is transmitted to the switches SW2 and SW3.
are supplied to the rotary heads Y+ and Yz, respectively, through the rotary heads Y+ and Yz.

Returning again to FIG. 1, the arrangement of the rotary head and the like according to the method of the present invention will be explained in more detail. Note that, in the figure, illustration of audio-only rotary heads A+ and A2, which will be described later, is omitted. As shown in the figure, the first rotary head C1 and the second rotary head c2 are respectively installed at positions facing each other by 180° on the rotating surface of a rotating body such as a rotary drum, and the third rotary head The head Y+ and the fourth rotary head Y2 are mounted at positions facing each other by 180° on the rotating surface, and are mounted at positions preceding the rotary heads C+ and C2 by a distance 111c in the rotational direction. ing. Furthermore, the third
The rotary head Y1 is installed at a position 29 μl higher than the lower end of the fourth rotary head Y2, which is located at the bottom of the rotary body among the four rotary heads, and the second rotary head C2 is 58 μm from the lower end of the fourth rotating head Y2
and the first rotating head C+
is mounted at a position 96μ layers higher than the lower end of the fourth rotary head Y2. That is, the four rotating heads are arranged at Yz and Y+ from the bottom in the height direction of the rotating body.

C2 and C+ are installed in that order, and the track width of each of Y+ and Yz is selected to be 29 μm, so the third
The F end of the rotary head Y+ is at the same height as the upper end of the fourth rotary head Y2, and the C end of the rotary head C2 of the - force cylinder 2 is at the same height as the upper end of the third rotary head Yl. be. Furthermore, if the track width of each of the rotary heads C+ and C2 is selected to be, for example, 20 μm, then the space between the upper end of the second rotary head C2 and the lower end of the first rotary head C1 is 38 μm.
A distance of -20μ = 18μ is provided.

Note that the distance from the upper end of the first rotary head C1 to the lower end of the fourth rotary head Y2 is the track width 29 μm×4=
It has been selected as the 116μ theory.

Here, the azimuth angles of the four rotary heads mentioned above are selected to be the same as the azimuth angles of the rotary heads that are standardized in the current low frequency conversion color recording and reproducing system VTR, and therefore, the rotary heads C2 and The azimuth angle of Yl is selected to be +6°, respectively, and the azimuth angle of C+ and Y+ is selected to be -6°, respectively.

As a result, a track pattern as shown in FIG. 4 is formed on the magnetic tape 43. In the figure, magnetic tape 43
Two audio tracks formed along the longitudinal direction of the tape at the upper end and a control track in which control pulses of a fixed period (for example, 1 frame) are recorded along the longitudinal direction of the tape are omitted at the lower end of the tape. do.

Here, TY1, TY2, and TY3 are obtained by frequency modulating the luminance signal, which is the first information signal, for one field each (
(Actually, an overlap recording period valve is added to this) A recorded track with a track width of 29μ-, Tc+,
Tcz and Tcs are the tracks with a track width of 20μ-, on which the second frequency division multiplexed signal, which is the second information signal, is recorded for one field at a time (actually, an overlap recording period valve is added to this). , are formed at an angle with respect to the longitudinal direction of the tape. Also, 01~G3
indicates a guard band with a track width of 9μ formed between tracks where mutually different signals are recorded. The tracks TYI and Te3 are separately and simultaneously formed by the third rotary head Y1 and the first rotary head CI at a pattern interval corresponding to approximately one field (i.e., the track T
Y2 and guard band G2.29μ■+9μ−-38μ
m), and during the next one field period, the tracks TY2 and Tcx are separately and simultaneously formed by the fourth rotary head Y2 and the second rotary head C2 for approximately one field different from the above. The corresponding pattern spacing (i.e. track TC2 and guard band G2.20uw
+9 μl −29 μa+). Also, between tracks TYI and TY2, and between Te3 and Te
3, no guard band is formed (or a very small guard band is formed).

In FIG. 4, rotating heads Y2 and C2 are connected to tracks TY2. T
When reaching the final part f'a of C3, the rotating head Y+, C
This shows the state when + is located at the starting end of the next track Tv+, Tcz.

Here, the home-use V
Considering compatible playback with Tr(, rotating head Y+,
The diameter of the rotating body to which Yl, C+, and C2 are attached, and around which the magnetic tape is wound diagonally over an angle of over 180 degrees, must be the same as the diameter of the rotating body of the home VTR. Furthermore, the angle (still inclination angle) of the scanning track locus of the rotary head with respect to the longitudinal direction of the tape when the magnetic tape stops running must be the same as that of the home VTR. Even if these conditions are met, the fourth
In order to form the illustrated track pattern, the home VT
If you try to make the tape running speed faster than the tape running speed in R's IIA semi-mode and record in H alignment, the recording time will become a certain value, and conversely, the recording time will not be adjusted to the desired time. If you do so, you will not be able to record in H order.

However, even when the tape running speed is increased as described above, by selecting the distance C between the upper rotary head C1 or C2 and the upper rotary head YI or Yl, it is possible to perform H-aligned recording. It is possible.

According to this embodiment, a wide guard band is provided between adjacent different information signal recording tracks, and the azimuth is reversed, and as shown in FIG. 3(B), the color signal carrier is Since the frequency is selected to be higher than the low frequency conversion carrier color signal (629kHz) of the low frequency conversion color recording/reproducing method, it can be expected to be more effective in preventing crosstalk.

On the other hand, the guard band between adjacent information signal distribution tracks of the same type is extremely small or there is no guard band, but the rotary heads Y1 and Y2. Alternatively, it is formed by C+ and C2, and almost no crosstalk occurs due to the azimuth loss effect. Furthermore, crosstalk can be reduced by recording in H alignment, and in addition, there is an approximate signal with field correlation between adjacent tracks ( Since the two-color difference signal) is recorded, crosstalk can be canceled using field correlation, and as described above, crosstalk can be prevented from becoming a problem even without using AST.

Note that when recording based on the above Y/C separation recording method, the audio-only rotary heads A1 and A2 shown in FIG.
is not used.

Next, a case will be described in which recording is performed based on the low frequency conversion color recording method. While running the magnetic tape at the same running speed as in standard mode in current home VTRs, rotating heads Y1, Y2 . Alternatively, recording is performed using two rotating heads C1 and C2. Also, at this time, rotary heads A+ and A2 are also used. Although either the lower rotary heads Y1 and Y2 or the upper rotary heads C+ and C2 can be used, this embodiment uses the lower rotary heads Y+ and Y2. This is to eliminate the effect on recording even if there is a slight crosstalk between the heads, and by using the lower rotary heads Y1 and Y2, even if there is crosstalk between the heads, even if it leaks to the upper rotary heads C1 and C2. Even if an information signal is recorded, the recorded portion is transferred to the rotary heads Y+ and Y on the return side.
2 scans and records, so the upper rotating head C1
This is because unnecessary recorded portions due to C2 and C2 can be erased.

In FIG. 2, when recording based on the low frequency conversion color recording method, the switches SW+,
SW2 and SW a are each switched and connected to a contact point.

At the same time, the recording amplifiers 21 and 35 are rendered inactive, respectively, and the supply of signals to the rotary heads C1 and C2 is blocked. Here, the magnetic tape 43 has the same track pitch as in the standard mode of current home VTRs, for example, a track pitch of 58μ.
The vehicle is made to travel at a predetermined travel speed of m.

Further, the third frequency division multiplexed signal taken out from the conventional recording circuit 36 is supplied to the rotary head Y1 through the switch SW2, and is supplied to the rotary head Y2 through the switch SWz.

On the other hand, the adder 41 outputs the first FM audio signal and the second FM audio signal.
A fourth frequency division multiplexed signal consisting of the M audio signal is taken out and supplied to the rotary heads A1 and A2, respectively, through the switch S W + and the recording amplifier 42, respectively.

Figure 5 shows a track pattern during recording based on the low frequency conversion color recording system. In the figure, the audio track and control track are not shown, and this magnetic tape is designed so that the track pitch is 58 μm. The vehicle is made to run at a predetermined speed. A third frequency division multiplexing method 3 consisting of a frequency-modulated i-degree signal and a low-frequency converted carrier color signal occupying an empty frequency region on the lower frequency side thereof.
One field of @ is first changed to a width of 29 by rotating head Y1.
Immediately before recording begins on the μm track (video track) T+ and the rotary head Y1 has rotated, for example, by 75 degrees, a frequency-modulated audio signal (fourth frequency division multiplexed signal) has already been recorded by the rotary head A+. For example, an audio track having a width of 27 μl is scanned to form a track T+ on the audio track and recorded.

Here, in the audio track, the fourth frequency division multiplexed signal No. 18 is recorded from a relatively low frequency to a deep part of the magnetic layer, whereas the frequency modulated luminance signal is recorded at a high frequency. , and since the low frequency conversion carrier color signal is unsaturated recorded, it is recorded only in the surface layer portion of the magnetic layer. Therefore, the track T1 and the audio track can coexist at the same position on the tape.

The rotary head A2 starts recording the next audio track when the rotary head Y+ rotates, for example, 105 degrees, and the rotary head Y2 starts recording the next audio track of the third frequency division multiplexed signal from the time the rotary head Y1 rotates 180 degrees. Recording for one field is started. The rotary head Y2 forms a track T2 with a width of 29μ on the audio track of the above method. Hereafter, in the same manner as above, the rotary head Y
＋.

Y2. With A+ and 82, the track pitch is 58μ fog,
A guard band with a width of 58 μm is provided on the frequency division multiplexed signal recording track T3. T4 and audio tracks are sequentially formed.

Next, a system for reproducing information signals on a magnetic tape recorded according to the present invention will be explained. FIG. 6 shows a block diagram of an example of this reproduction system. In the figure, selector switch SW4
, SWs and SWs are connected to the contact a side when reproducing a Y/C separated recording track pattern (in the first reproduction mode), and on the other hand, when reproducing a track pattern recorded by the low frequency conversion color recording method (in the second reproduction mode). During re-economy), the connection is switched to the contact side. First, for the reproduction operation of a magnetic tape having a Y/C separated recording track pattern as shown in FIG.
To explain, at this time, the switches SW4 to SWs are connected to contact a as described above, and the magnetic tape is run at the same predetermined high speed as during recording. In Figure 6,
In one field period, the reproduced FM71! obtained by scanning the track Tv+ with the rotary head Y+. The i degree signal is supplied to the switch 47 through the preamplifier 441 and the switch SWs, and in the next one field period, the reproduced FM luminance signal obtained by scanning the track TY2 with the rotary head Y2 is supplied to the switch 47 through the preamplifier 442 and the switch -8Ws. supplied to Thereafter, the FM luminance signal is alternately reproduced for each field by the rotary heads Y1 and Y2 in the same manner as described above.

The switch 47 selects and outputs the reproduced FM luminance signals from the preamplifiers 441 and 442 for each field to the high-pass filters 51 . The signal is supplied through a first limiter 52 to a second limiter and an FM demodulator 53. In addition, high-pass filter 5
1 may be omitted. The broadband reproduced luminance signal extracted from the second limiter and FM demodulator 53 is filtered through a low-pass filter 54. A matrix circuit 57, which will be described later, passes through a de-emphasis circuit 55 and a noise canceller 56, respectively.
supplied to

1 "L"・1""7FC11"jcz h"
r17(-)Lr1 Second frequency separation line m taken out alternately for each code: The signal is sent to the preamplifier 45 through a rotary transformer (not shown).
+, 452, and further supplied from this to a switch 48 that switches on a field-by-field basis, where the output signals of the preamplifiers 45+ and 452 are alternately switched on a field-by-field basis, followed by a high-pass filter 58 and a low-pass filter. 59
are supplied respectively. Minute 1111 by high pass filter 58
The 1F reproduced first FM color difference signal is demodulated into a reproduced color difference signal @R-Y through a first limiter 60°, a second limiter and an FMI modulator 61, and then a low-pass filter 6.
2, the carrier is removed by a de-emphasis circuit 63, a high-frequency attenuation characteristic complementary to that of the pre-emphasis circuit 26 is imparted, and then subjected to noise reduction processing using H correlation in a noise canceller circuit 64, and then sent to a matrix circuit 57. Supplied.

On the other hand, the reproduced second FM color difference signal, which has been divided into enF waves by the low-pass filter 59, is supplied to a carrier shifter 66 after level fluctuations are removed by a first limiter 65, where it is adjusted so that the band does not overlap with the demodulated signal. Frequency conversion to high range (
2nd limiter and FMviU after carrier shift)
The signal is supplied to the A unit 67 and demodulated into the original reproduced color difference signal B-Y. This reproduced color difference signal is passed through a low-pass filter 68. The signal is supplied to the matrix circuit 57 through a de-emphasis circuit 69 and a noise canceller 70, respectively. The matrix circuit 57 matrixes the reproduced luminance signal and two types of reproduced color difference signals RY and BY to produce red (R).

Output terminal 71.7 for each primary color signal of green (G) and blue (8)
2 and 73, and outputs a composite synchronization signal to the output terminal 74. Note that the recording time difference between the luminance signal and the color difference signal is a difference that is allowed within the vertical blanking period, so by considering the switching point within this period during playback, it is possible to It is possible to aim for

Next, when reproducing a magnetic tape having the track pattern shown in FIG. : Since the connection is switched, the reproduction signal obtained by scanning tracks T+, 1-z, etc. with the lower rotary heads Y1 and Y2 is sent to the preamplifier 44I.

The signal is supplied to the conventional reproducing circuit 75 through a switch 442, a switch SWs, and a switch 49 that is switched for each field. This conventional reproducing circuit 75 is supplied with a third frequency division multiplexed signal consisting of an FM luminance signal and a low frequency conversion carrier color signal, and reproduces the original color I21! by conventionally known means. This is a circuit that performs conversion processing into an image signal, and outputs a reproduced color video signal to the output terminal 76.

On the other hand, the fourth audio track is played back from the audio track alternately every field by the rotary heads A1 and A2.
The frequency division multiplexed signal is passed through a rotary transformer (not shown), a preamplifier 461, a switch 50 which is switched every field, and a switch SW4 to pass through a bandpass filter 77.

People are supplied to 77R. The first FM audio signal taken out from the bandpass filter 771 and the second FM audio signal taken out from the bandpass filter 771N (separately
After being supplied to demodulation circuits 781.78R and subjected to FM demodulation, it is then supplied to low-pass filter de-emphasis circuits 79L and 79R.
The signal is output to the output terminal 80+- as a left channel reproduced audio signal, and to the output terminal 80R as a right channel reproduced audio signal.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the first and second information signals recorded in the track pattern shown in FIG. 4 include one of the luminance signals and the other two types of color difference signals. However, ■ One is a luminance signal, and the other is a frequency division multiplexed signal consisting of signals obtained by separately frequency modulating two types of color difference signals and an audio signal.■ One is a luminance signal, and the other is two types of signals. A signal obtained by frequency-division multiplexing an audio signal obtained by PCM, 4-phase DPSK modulation, or 4-phase PSK modulation on a signal obtained by frequency modulating color difference signals separately.

■One is a composite color video signal and the other is an audio signal.

(2) Any of various combinations may be used, such as a signal in which one is a luminance signal and the other is a frequency-modulated time-axis compressed line sequential color difference signal, and a modulated audio signal is frequency-division multiplexed. Further, both the rotary heads Y1 and Y2 and C+ and C2 may be replaced. Furthermore, it goes without saying that the track width of each rotary head is not limited to that of the embodiment.

According to the present invention, the track pattern is recorded so that the same signals are adjacent to each other every two tracks, so there is no need to provide a guard band between the same signal recording tracks. In addition to improving tape utilization efficiency, each track has a reverse azimuth, so
A sufficient losstalk prevention effect can be obtained without providing a guard band that is much wider than the conventional one between different signal recording tracks.

Further, according to the present invention, when two tracks are simultaneously and separately formed to record the first and second information signals respectively, high quality information signal recording is possible, and the Since it is possible to perform recording using the current low frequency conversion color recording method using the 2@ rotating heads attached to the rotating body opposite to the back of the 4 ill rotating heads, the number of rotating heads can be increased. It has many features such as being able to perform recording with a wide variety of functions using an extremely small number of rotating heads.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the arrangement of a rotating head, which is the main part of the method of the present invention, FIG. 2 is a block system diagram showing an embodiment of a recording device that realizes the method of the present invention, and FIG. 3 (A>
, (B) are diagrams showing the frequency spectra of a luminance signal and a color difference signal, respectively, FIGS. 4 and 5 are diagrams showing respective examples of track patterns recorded and formed according to the present invention, and FIG. 6 is a diagram showing respective examples of track patterns recorded and formed according to the present invention. FIGS. 7 and 8 are block diagrams showing an example of a reproducing apparatus for reproducing a magnetic tape having a track pattern recorded by a conventional recording method. FIG. Illustration 1
~ FIG. 3 is a diagram showing a rotary head arrangement for forming a easy pattern. 15... Composite color video signal input terminal, 16... Decoder, 20.30, 31.39L, 39R... FM
Modulator, 34. 41... Adder, 36... Conventional recording circuit, 37L, 37R... Audio signal input terminal, 43.
...Magnetic tape, CI...first rotating head, C2.
...Second rotary head, Yl...Third rotary head,
Yl...Fourth rotating head, A+, A2...Audio rotating head, SW+~SWs...changeover switch, TVI~TY3...luminance signal recording track, Tc
+~Tcs...Color difference signal recording track, ■1~T4・
...Video track. Patent applicant: Victor Japan Co., Ltd.

Claims (2)

[Claims] (1) Two different types of first and second information signals
In a magnetic recording method for recording on tracks of a book separately and simultaneously, first and second rotating heads are mounted at opposite positions on a rotating surface of a rotating body at different heights;
mounted at opposite positions on the rotating surface of the rotating body at different heights, and close to the respective mounting positions of the first and second rotating heads in the rotational direction of the rotating body, and, among the third and fourth rotary heads installed at different heights in the direction of the rotational axis of the rotary body, the first information signal is transmitted to the first head having a gap of a different azimuth angle. and a second rotary head, respectively, and a second information signal is supplied to the third and fourth rotary heads having gaps with mutually different azimuth angles, and during one track scanning period, the third and fourth rotary heads have gaps with the same azimuth angle. Separately and substantially simultaneously, first and second tracks having a pattern interval of at least one field are formed between each other by the first and third rotary heads having a gap of During the period, third and fourth tracks having a pattern interval of at least one field between each other are formed separately and substantially simultaneously by the second and fourth rotary heads having a gap of the same azimuth angle. By repeating this, adjacent first information signal recording tracks recorded and formed by the first and second rotary heads and adjacent second information signal recording tracks recorded and formed by the third and fourth rotary heads. Recording is performed with a very small guard band or no guard band between the recording tracks, and between the adjacent first and fourth tracks on which mutually different information signals are recorded, and between the adjacent second and fourth tracks where different information signals are recorded. A magnetic recording method characterized by recording by providing wide guard bands between each of the three tracks. (2) The first and second rotating heads are mounted at different heights at opposing positions on the rotating surface of the rotating body, and the first and second rotating heads are mounted at different heights at opposing positions on the rotating surface of the rotating body. The first and second rotary heads are arranged close to each other in the direction of rotation of the rotor, and have different heights in the direction of the rotation axis of the rotor. Of the attached third and fourth rotary heads, the first information signal is supplied to the first and second rotary heads having gaps of mutually different azimuth angles, and the second information signal is supplied to the first and second rotary heads, respectively. The third and fourth rotary heads having gaps of different azimuth angles are supplied, and during one track scanning period, the first and third rotary heads have gaps of the same azimuth angle. first and second tracks having a pattern interval of at least one field are formed separately and substantially simultaneously, and the second and fourth rotations have a gap of the same azimuth angle in the next one track scanning period; A first recording mode in which third and fourth tracks having a pattern interval of at least one field between each other are repeatedly formed by the head separately and substantially simultaneously; and the first and second rotations. a second recording mode in which tracks on which the third information signal is recorded are sequentially formed one by one using the head or two rotary heads consisting of the third and fourth rotary heads; A magnetic recording method in which, in a first recording mode, adjacent first information signal recording tracks recorded and formed by the first and second rotating heads and recording by the third and fourth rotating heads are provided. Recording is performed between the formed adjacent second information signal recording tracks with a very small guard band or without providing a guard band, and the adjacent first and fourth information signal recording tracks on which different information signals are recorded are recorded. A magnetic recording method characterized in that recording is performed by providing wide guard bands between tracks and between adjacent second and third tracks.