JPS59129936A - Magnetic tape - Google Patents

Abstract

PURPOSE:To record the respective signals in each magnetic layer with a good magnetizing efficiency by setting an orienting direction of plural magnetic layers in the shape of a layer of a magnetic tape, to the direction corresponding to the gap of a magnetic head. CONSTITUTION:A magnetic layer 1a of a magnetic tape 1 is formed in the shape of three layers of an upper layer 1a1, an intermediate layer 1a2 and a lower layer 1a3. The orienting direction of magnetic material particles of the lower 1a3 is parallel to the surface of a tape, at an almost right angle with the direction of gaps gL1, gL2 of two rotary magnetic heads (an angular interval of 180 deg. and an azimuth angle is + or -45 deg.) HL1, HL2, and is set to a direction y0 of 45 deg. to a direction falling at a right angle with a scanning direction X. The orienting direction of the intermediate layer 1a2 is parallel to the surface of a tape, and is set to a direction x0 of -45 deg. go a direction falling at a right angle with X. The orienting direction of the upper layer 1a1 is set to a direction z0 almost vertical to the surface of a tape. A video signal and two groups of modulation voice signals are supplied to three pairs of magnetic heads HV1, HV2; HR1, HR2 and HL1, HL2 of an angular interval of 180 deg., which are fitted to a rotary head 2, respectively, and they are recorded with a good magnetizing efficiency in the upper layer 1a1, the intermediate layer 1a2 and the lower layer 1a3, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a VTR (Video Chip Recorder) which records and reproduces a signal obtained by frequency modulating (FM modulating) an audio signal on a magnetic tape and overlapping it with a video signal. □Relates to a magnetic tape suitable for application to a magnetic tape.

BACKGROUND ART AND PROBLEMS The present applicant has first superimposed a signal obtained by frequency modulating an audio signal (modulated audio signal) with a video signal on a magnetic tape in order to obtain an audio signal with a better S/N ratio. He proposed a VTR that records and plays back.

In this method, for example, a video signal is recorded on the upper layer of the same magnetic layer of a magnetic tape, and a modulated audio signal is recorded on the middle layer and lower layer portions using magnetic heads having different azimuth angles and then reproduced. According to K, the recording and reproduction of the modulated audio signal has almost no effect on the recording and reproduction of the video signal. Therefore, it is possible to record the modulated audio signal without restricting the band and level so much, and it is possible to obtain an audio signal with better S/H.

However, in this case, the signals are recorded on the same magnetic layer in which the magnetic substances are oriented in the same direction using magnetic heads having different azimuth angles, so this is not very good from the viewpoint of magnetization efficiency. There wasn't.

Purpose of the Invention The present invention has been made in view of the above points, and is designed to improve the magnetization efficiency by 5KL.

Summary of the Invention In order to achieve the above object, the present invention comprises a plurality of magnetic layers arranged in a layered manner, and the orientation direction of each magnetic layer is a direction corresponding to the gap of a magnetic head for recording and reproducing signals. It is characterized by being

Since the present invention is configured as described above, each signal can be efficiently recorded in each magnetic layer.

Embodiments Hereinafter, with reference to the drawings, the present invention will describe a V T for recording and reproducing a modulated audio signal on a magnetic tape in a superimposed manner with a video signal.
Let us explain an example in which it is applied to a magnetic tape.

Fig. 1 shows a rotary head device of a VTR, and 2
Two rotating magnetic heads HVI and Hv2 are installed with an angular spacing of approximately 180 degrees, and two rotating magnetic heads HRI and gRz are installed adjacent to the heads Hv1 and HV2, respectively, with an angular spacing of approximately 18o0. , the heads HRI and HL2 are mounted with an angular spacing of approximately 180'. Head HVI and HV
2 is, for example, a ring head or a single magnetic pole head, and heads HR1, gRz, HLI, and HL2 are, for example, ring heads. In this case, the heads HRI and gRz are rotated in the rotational direction X from the heads HV1 and HV2 so as to precede the heads I-IV1 and
This head l- is attached to the side and heads HL1 and HL2 precede heads HRI and gRz, respectively.
It is attached on the rotation direction X side from lR1 and gRz.

In addition, (1) indicates a magnetic tape, and the tape guide drum (
2), the vehicle is caused to run diagonally in the Y direction over an angular range of approximately 180'.

As shown in FIG. 2, the azimuth angles (inclination angles with respect to the direction perpendicular to the running direction X) θVl and θ■2 of the gaps gV1 and gV2 of the heads HV1 and HV2 are made equal;
Also, the gap between head HR1 and gRz is 4gR
The azimuth angles θR1 and θR2 of 1 and gRz are 'JL〈
Furthermore, the gap gL between heads HLI and HL2
The azimuth angles θL1 and θL2 of 1 and gL2 are made equal. Also, the azimuth angles θVl (θv2), θR1 (θ
R2) and θLl (θL2) are made to be significantly different from each other, and K is set such that the azimuth loss between them is equal.

In this example, the azimuth angle θVl (θV2) is 0°,
or selected close to it, azimuth angle θR1 (θR2)
is +45°, azimuth angle θL! (θL2) is chosen to be −45°.

The width of the gaps gR1 and gR2 of heads HRI and 1■R2 is the gap gV1 of heads HVI and HV2.
and gV2, and the head HL
The widths of the gaps gL1 and gL2 between the heads HR1 and gRz are made wider than the widths of the gaps gR1 and gR2 between the heads HR1 and gRz. For example, the widths of gaps gV1 and gV2 are set to 0.25 to 0.6 ttm, and the widths of gaps gR1
and gR2 have a width of 1 to 3 μm, and gaps gL1 and gL2 have widths of 1.5 to 6 μm.

In normal magnetic recording, information can be recorded on the magnetic layer of a magnetic tape to a depth that is approximately half the gap width of the magnetic head. Well, when thinking about reproduction, the longer the recording wavelength, the deeper the recording can be made into the magnetic layer. Gap gR
The reason why the widths of the gaps gV1 and gR2 are made wider than the widths of the gaps gV1 and gV2 is to record the signals recorded by the heads HRI and gRz in the deep magnetic layer of the magnetic tape (1). Similarly, the reason why the width of the gaps gL1 and gL2 is made wider than the width of the gaps gR1 and gR2 is because the signals recorded by the heads HLl and HL2 are recorded in the deeper magnetic layer of the magnetic tape (1). be.

In addition, the heads Hvx, sHV2, l-lR1,
gRz, HLI, and HL2 are rotated once in one frame, for example. And head HLI, HHt
, Hvx and HL2 s gRz , HV2 are configured to alternately scan the magnetic tape (1) every field. At this time, heads HRI and gRz precede heads I-IVl and H2, respectively, and head HLI
and HL2 are respectively head 1 (preceding R1 and gRz)
to scan the magnetic tape (1).

Although it will be explained later, when recording, the heads l-1y1 and 1
A video signal Sv' (a composite signal of a modulated luminance signal YFM and a low frequency conversion color signal cD, the frequency spectrum of which is shown in FIG. 3) is supplied to -IV2, and a modulated audio signal ARFM ( A modulated audio signal ALFM (the frequency spectrum of which is shown in FIG. 3) is supplied to the heads HLI and HL2.

In this case, the recording current of -
Based on the recorded current of R2, it is determined to be a dog. In this case, each signal is recorded in saturation, for example, and the heads HLI and HL2,
A recording current larger than the saturation recording current when recording alone is applied to HRI and I]R2.

Further, in this example, the magnetic tape (1) has a structure as shown in FIG. That is, the magnetic layer (1a) is the upper layer (la
1), middle NA (laz) and lower layer (123). The orientation direction of the magnetic particles in the lower layer (laa) is parallel to the tape surface, and
The direction is substantially perpendicular to the direction of the gap gL1 (gLz) of (HL2). In this example, the direction yo is +45° with respect to the direction perpendicular to the scanning direction x2.

Also inside! The orientation direction of the magnetic particles (laz) is parallel to the tape surface and is parallel to the above-mentioned head HRI (HR2
) is substantially perpendicular to the direction of the gap gRx (gRz). In this example, the direction Xo is 145° with respect to the direction perpendicular to the scanning direction X. Furthermore, top/1fl
The orientation direction of the magnetic particles (fal) is a direction Zo substantially perpendicular to the tape surface and a direction 7. 1, ru.

The thicknesses dl, d2, and d3 of the upper layer (1a1), the middle layer (1a2), and the lower layer (laa) are the recording signals recorded in each layer, that is, the head (vl and HV), respectively.
2 K supplied video SV', modulated audio signal ARFM
And the recording wavelength of the main signal component in terms of ALFM width is λ
1, λ2 and λ3, respectively, for example, d = child ~ child ... mountain (1) dz = -(
λ2-λl)～-(λ2-λ1゛l)・・・・・・(
2) 4 632 pieces (λ3-λ2-λ1) to 7 (λ3-λ2-λl
)...Selected as (3).

Further, this magnetic tape (1) is manufactured, for example, by the steps shown in FIG. First, as shown in FIG.
3) Form. In this case, since orientation is performed during the vapor deposition or sputtering process, the orientation is made in the above-mentioned direction.

Next, as shown in FIG. B, an intermediate layer (LAZ) is formed on the lower layer (133) by, for example, vapor deposition or sputtering using the same magnetic material that constitutes the lower layer (LAA). In this case, Since the orientation is also carried out during the process of vapor deposition or snow-driving, it should be oriented in the above-mentioned direction.Next, as shown in FIG. A magnetic material made of ferrite is applied to form an upper layer (LAL).In this case, after application,
Before it dries, it is subjected to a so-called pressure calendering process by applying pressure with a roller (3) so that it is oriented in the above-mentioned direction.

Incidentally, the magnetic tape (1) undergoes the process (
r) Other K, lower layer (laa), middle layer (1a2) and upper layer (
It is also conceivable to manufacture each layer of (lal) by coating and orienting each layer. In this case, the upper layer (lal) may be made of a magnetic material such as barium ferrite.

In addition, the magnetic tape (1) is manufactured by coating and aligning a lower JFi (laa) and a middle layer (1a2), and then forming a metal film as an upper Rjj (lax) by vapor deposition or sputtering. can also be considered.

In this example, during recording, the video signal Sv' is supplied to the heads HVI and HV2, and the head HR
The modulated audio signal RFM is supplied to heads I and HR2, the modulated audio signal ALFM is supplied to heads HLI and HL2, and as shown in FIG.
Head HLl, HRI, HV alternately for every l field
Wi2 due to I) rack T1 and head H, L2, H
A recording track T2 is sequentially formed by R2 and Hy2. On the recording tracks TI and T2, the video signal S■' and the modulated audio signals ARFM and ALFM are recorded in a superimposed manner at different recording azimuths. That is, in Figure 7, the person is Herad Ht.
, t , l (recording track T1 by R'l and HVl
However, if you observe this cross section, you will see the same figure B.
As shown in Figure 2, the modulated audio (i
No. ALFM is recorded up to the lower layer (1a3) of the magnetic layer (la) of the magnetic tape (1). Next, the heads H and R1 transmit the modulated audio signal A RFM into the middle layer (l) of the magnetic layer (1a).
a2) Recorded in 萱. At this time, the lower layer (1a3) is made into a trench in which the modulated audio signal ALFM is recorded. Next, the video signal SV' is converted into a magnetic N Oa) by the head H1.
The upper layer (fat) of K is recorded vertically. At this point, the lower layer (1a3) is set to 1 where the modulated audio signal ALFM is recorded, and the middle layer (1a2) is where the modulated audio signal ARFM is recorded! , is said to be the site.

Also, during playback, head I (Ll, 'nR1, HV
l and HL2.11R2 and HV2 are respectively recording trunks T
l', T2 is scanned. Therefore, heads 'HLl and 1L2 record tracks TI and T2, respectively.
The modulated audio signal ALFM is reproduced. The heads HRI and ) (R2 are used to record tracks TI and T2, respectively)
The modulated audio signal ARFM is reproduced. Furthermore, the heads HV1 and HV2 reproduce the video signal S■' from the recording tracks T1 and Tl, respectively.

What is shown in FIG. 8 is the recording system and recirculation system circuits in this example.

In the same figure, (100V) is a recording system circuit for a video signal of 8V, and the video signal sv
is supplied. This video signal Sv is supplied to a low-pass filter 02) to obtain a luminance signal Y, which is supplied to an FM modulator (14J) through a pre-emphasis circuit α3). .2M1-1z, sink tip is 3°8'
M) The luminance signal Y is FM-modulated so that it becomes Iz, and a modulated luminance signal YFM is obtained. This modulated luminance signal YFM is band-limited through a bypass filter α9, further amplified by an amplifier α6), and then supplied to a synthesizer α7)K.

Further, the video signal 8V supplied to the terminal (11) is supplied to the band pass filter (181) to obtain the color signal C, which is supplied to the frequency converter α.
A conversion signal is supplied to the wave number converter (L→) from the oscillation circuit (2), and a low frequency converted color signal CD with a carrier frequency of, for example, 688KI-1z is obtained.This low frequency converted color signal c
D is band-limited through a low-pass filter (2I),
After being further amplified by an amplifier (22), it is supplied to a combiner. In this case, as shown in the frequency spectrum in FIG. 3, the level of the low frequency conversion color signal CD is, for example, the modulation degree signal YFMO times the level. This is to prevent this low frequency converted color signal cD from being recorded on the middle layer (1a2) or the lower layer (1a3) of the magnetic layer (la).

A synthesized signal (hereinafter referred to as video signal Sv') of the modulated audio signal YFM and the low frequency converted color signal CD obtained from the synthesizer 07). , the recording wavelength is 06 to 2 μm) is supplied to the head I-I Vl through a changeover switch (23) and a rotary transformer (2).
6) to the head HV2. The changeover switches (23) and (25) are respectively connected to the R side during recording and to the P side during playback.

1. In Figure 8, (100L) is the first audio signal (
This is an AL recording circuit (left signal for stereo, main signal for dual audio). The first audio signal AL is connected to the terminal (31L).
is supplied. This first audio signal AL C terminal (31L)
The synthesizer (
34L). Further, r3 is an oscillator for obtaining a pilot signal 5PILOT for jitter correction. This oscillator G5) generates an audible frequency of 20 KH.
z, an oscillation signal of, for example, 25 to 30 KHz is obtained, and this is supplied to the synthesizer (34L) as the pilot signal 5PILOT.

The first audio signal AI obtained from this synthesizer (34L).

The composite signal of the pilot signal S P I LOT is I
'M modulator (36L). And this ll
In the i'M modulator (36L), this composite signal is
For example, if the carrier frequency is l MHz and the frequency deviation is ±150
The modulated audio signal ALFM (3rd
) is obtained. This modulated audio signal ALFM is
The frequency of the main signal component is 0.5 to 1.5 MHz, and the recording wavelength is 6 to 18 μm. This modulated audio signal ALFM
is supplied to the amplifier (38L) through a harmonic-removal bandpass filter (37L). Then, the amplifier (3
This amplified modulated audio signal ALFM is supplied to the head I-I L 2 through a changeover switch (41L) and a rotary transformer (42L). The changeover switches (39L) and (41L) are respectively connected to the R side during recording and to the P side during playback.

Also, in FIG. 8, (1001%) is the second audio signal (
This is the AR recording system circuit (right signal for stereo, sub signal for dual audio). This circuit (100R) has the same structure as the circuit (100L) described above. Therefore, R' is added instead of L'' to the corresponding parts, and detailed explanation thereof is omitted.In addition, in this circuit (100I(,),
In the FM modulator (36R), the composite signal of the second audio signal AR and the pilot signal 5PILOT has a carrier frequency of 1.4 MHz and a frequency deviation of ±150 KH.
z to obtain a modulated audio signal ARFM (shown in FIG. 3). This modulated audio signal ARFM has a main signal component frequency of 1 to 3 MHz and a recording wavelength of 3 to 9 μm.
It is.

In this Fig. 8, when recording, the changeover switch (to)
, 351, (39L) , (39Tsu, ('41L)
) and (41) are respectively switched to the R side, so the heads HVI and HV2 receive the video signal sv as described above.
', the heads HL1 and HL2 are supplied with a modulated audio signal ALFM, and the heads HRI and HR2 are supplied with a modulated audio signal ARFM. Therefore, as shown in FIG. 6, on the magnetic tape (1), the recording trunks T1 and the heads HV2, HL2, HV2, HL2, HL1, and heads ``Vl'', ``IL1'', and recording trunks HV2, HL2,
Recording tracks T2 by HR2K are sequentially formed.

Further, in FIG. 8, (200V) is a video signal reproduction system circuit. As mentioned above, for example, the recording track T
The video signal SV' reproduced by head Hvl from I is
The signal is supplied to the switch circuit 6 through the amplifier (501). Further, as described in 5 above, for example, the video signal Sv' reproduced by the head HV2 from the recording track T2 is
The wood is supplied to the switch circuit 61) through the device (502). A switching control signal SC obtained according to the rotational positions of the heads iV1 and FIv2 is supplied from a terminal (51a) to the switch circuit 51), and the switching is controlled. This switch circuit 51) alternately obtains video signals SV' reproduced by the head IVl and the head Vl for each field.

Video signal SV' obtained from this switch circuit 51)
is supplied to a bypass filter (53), from which a modulated N degree signal YFM is obtained. This modulated luminance signal YFM is passed through an IJ transmitter circuit 53) to F'
M demodulator 5+)K is supplied, and a luminance signal Y is obtained from this FM demodulator 6→. This luminance signal Y is supplied to the synthesizer (56) through a de-emphasis circuit t55).

Video signal 8y' obtained from the switch circuit
FT,b is supplied to a low-pass filter (57), and a low-pass converted color signal CD is obtained from this low-pass filter (57). This low-pass converted color signal CD is supplied to a frequency converter 68). This frequency converter 58) includes AFC and A
The conversion signal (i) is supplied from the PC circuit (automatic frequency and automatic phase control circuit) 69), and the low frequency conversion color signal CD is converted to a color signal C with a carrier frequency of, for example, 3.58 MHz. Signal C is supplied to the synthesizer (a) through a bandpass filter.

In the synthesizer (56), the luminance signal Y and the color signal C are synthesized, and the utility signal gg -7- (Gl) is supplied with the video signal s.
V is obtained.

(200L) is the first audio signal AL
This is a reproduction system circuit. As mentioned above, for example, the modulated audio signal A reproduced by the head HL1 from the recording trunk T1
LpM has a center frequency of approximately 1 through the amplifier (71Ll).
1V11-(Z bandpass filter (72Ll
). And this band pass filter (7
The modulated audio signal ALFM from 2L1) is supplied to the F'M demodulator (74L1) through the lJ'% vine circuit (73L1). From this F'M f4 modulator (74LI), the first audio signal AL and the pilot signal S PIL
A composite signal of OT is obtained, which is used in the switch circuit (75L
) is supplied to the A side terminal.

As described above, the modulated audio signal ALFM reproduced from the recording track T2 by the head (for example, the head) IL2 is supplied to the bandpass filter (72L2) whose center frequency is approximately 1 MI (z-tossed) through the amplifier (71L2). The modulated audio signal ALFM from this bandpass filter (72L2) is then passed through the limiter circuit (73L2) to F
It is supplied to the M demodulator (74L2). A composite signal of the first audio signal AL and the pilot signal 8 P I LOT is obtained from this F'M demodulator (74L2), and this is supplied to the B-side terminal of the switch circuit (75L).

The switch circuit (75L) is supplied with a switching control signal SCL obtained from the terminal (75La) according to the rotational positions of the heads HL1 and IL2, and the switching is controlled.

That is, during one field period during which the head IL1 is scanning the recording trunk '1'1, the terminal is switched to the A side terminal, and the other one field period during which the head IL1 is scanning the recording track T2 is switched to the A side terminal. During the hold period, the terminal is switched to the B side. Therefore, this switch circuit (75L) is connected to the FM demodulator (75L).
4Ll) and (74L2)
A composite signal of L and the pilot signal SP I LOT is obtained for each field.

This composite signal is supplied to a low-pass filter (76L), and from this low-pass filter (76L) the first audio signal A is output.
I is obtained, and this is supplied to the combiner (77L) K. Further, the composite signal obtained from the switch circuit (75L) is supplied to a bandpass filter (78L) whose center frequency is set approximately equal to that of the pilot signal SPI LOT, and from this bandpass filter (78L) the pilot signal SPI LOT is LOT can help. This pilot signal 5PILOT is supplied to a frequency discriminator (79L), and this frequency discriminator (79L) outputs a jitter detection signal 5JI.
L is obtained. This jitter detection signal SJIL is inverted by an inverter (80L) and then supplied to a synthesizer (77L) through a semi-fixed resistor (81L) for level adjustment.

In the synthesizer (77L), a low-pass filter (76
A signal corresponding to the jitter detection signal SJIL is subtracted from the first audio signal AI supplied from the first audio signal AI, and the jitter component contained in the first audio signal AI is canceled out. Therefore, the synthesizer (77L) obtains the first audio signal AL from which the jitter component has been removed, and this is supplied to the output terminal (83L) through the expander (82L) constituting the noise reduction circuit. -Also, in Figure 8, (
20OR) is a circuit for reproducing the second audio signal AR.

This circuit (20OR) is.

It is configured similarly to the circuit (20OL) described above. Therefore, the reference numerals for the corresponding parts are given ``)K''''I('' instead of L'', and detailed explanation thereof will be omitted.In addition, this circuit (
2001 (), a bandpass filter (72Rx
) and (721(2) have a center frequency of 1.4λ4H
It is assumed to be z. The switch circuit (75R) is supplied with a switching control signal SCR obtained from the terminal (751ELa) according to the rotational positions of the heads HR1 and HB2.
The switching is controlled. That is, during one field period when the head HR1 is scanning the recording track T1, the terminal is switched to the A side, and during the other one field period when the head HR2 is scanning the recording track T2, the terminal is switched to the B side. can be switched to

In addition, in the synthesizer (77R), a signal corresponding to the jitter detection signal S JIR is subtracted from the second audio signal AR supplied from the low/subfilter (76R), and a
2. The jitter component contained in the f-voice signal R is canceled out. Therefore, a second audio signal AR from which jitter components have been removed is obtained from this synthesizer (77R), and this is supplied to an output terminal (83R) K through an expander (82R) constituting a noise reduction circuit.

In this example, the lCa is configured as described above, and the terminals (11), (31L
) and (31R), respectively, are supplied with the video signal sy, the first audio signal AL, and the second audio signal AR. During recording, the heads HV1 and HV2 are supplied with the video signal Sv', and the head I(r , i and HL2 are supplied with a modulated audio signal A LFM, and heads HR1 and HR2 are supplied with a modulated audio signal ARFM. Therefore, as shown in FIG. Recording track TI by heads I-ILl, l111.'HV1 and heads HL2, HR2, HV alternately for each field.
2, recording tracks T2 are sequentially formed. and,
On the recording tracks T1 and T2, the video signal S' and the modulated audio signals ALFM and ARFM are recorded in a superimposed manner at different recording azimuths.

During reproduction, heads HLl, R1, HVl and heads HL2, HR2, HV2 scan recording tracks T1 and T2, respectively.
HL2 Te modulated audio signal ALFM is reproduced and head H
The modulated audio signal ARFM is reproduced by RI and HR2,
Video signal S' is reproduced by heads HVI and Hv2. Therefore, output terminals 61), (83L) and (83R
), a video signal S■, a first audio signal AI, and a second audio signal AR are obtained, respectively.

According to this example, the video signal Sv' (short wavelength), the modulated audio signal ARFM (medium wavelength) and the 8LFM (long wavelength) are transmitted to the heads HVI (HV2) and HRI (Hn
z) and HLI (HL2:), the upper layer (1al), middle 16 (laz), and lower layer (la3) of the magnetic layer (1a) of the magnetic tape (1) are recorded with different recording azimuths, but the magnetic Upper layer (fal) of layer (la), middle layer (la2)
The orientation direction of the magnetic material forming the upper layer (la3) and the lower layer (la3) is substantially perpendicular to the tape surface in the upper rU (lax), and perpendicular magnetization is performed. (las), parallel to the tape surface, and heads HRI (HR2) and Hll (HL), respectively.
2) gaps gR1 (gRz) and gLl (gt,
Since horizontal magnetization is performed in a direction substantially perpendicular to the direction (2), recording can be performed with high magnetization efficiency.

Further, according to this example, each signal is transmitted to the upper layer (lal) of the magnetic tape (1) using separate heads.
The information is recorded on the middle layer (1a2) and the lower layer (1a3) at different recording azimuths, and then reproduced. Therefore, it is possible to record the modulated audio signals ALFM and ARFM without limiting the band and level, and the 8 of the audio signals AR and AL can be recorded.
/N can be made good.

In the above embodiment, the audio signal is the modulated audio signal A.
Although it is recorded in the form of LFM and ARFM, other signal forms (such as PCM) may be used.

Effects of the Invention According to the present invention described above, the orientation direction of each magnetic layer is adjusted to the gap K of the magnetic head for recording and reproducing signals.
Since the direction corresponds to 7J, each signal can be recorded in each magnetic layer with high magnetization efficiency. Therefore, the present invention can be suitably applied to a magnetic tape for a VTR in which a modulated audio signal is recorded and reproduced on a magnetic tape in a superimposed manner with a video signal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the rotary head device, FIG. 2 is a diagram showing the state of the gap of the rotary magnetic head, FIG. 3 is a diagram showing the frequency spectrum of the recording signal, and FIG. 4 is a diagram showing one example of the present invention. FIG. 5 is a diagram for explaining the manufacturing process, FIG. 6 is a diagram showing the recording nozzles (turns) on the magnetic tape, and FIG. 7 is a diagram showing the recording turns on the magnetic tape. A diagram for explaining the recording state, and FIG. 8 is a circuit configuration diagram of a recording/reproducing apparatus using an embodiment of the present invention. (1) is a magnetic tape, (1a) is a magnetic layer, (lal) (
laz) and (la3) are the upper layer, middle layer and lower layer, respectively (
100L), (look) and (100V) are the first
Circuits for recording the audio signal, second audio signal, and video signal; (200L), (200R), and (200V) are circuits for reproducing the first audio signal, second audio signal, and video signal, respectively; HL'l; , HL2, HRI, HR2, HV
1 and H2 are rotating magnetic heads, respectively. Figure 2 Figure '3 μ No. 1 IJ9r, (MH5') Figure 1 2゜

Claims (1)

[Claims] 1. A plurality of magnetic layers are layered, and each magnetic layer is oriented in a direction corresponding to a gap of a magnetic head for recording and reproducing signals. magnetic tape. 2. The first, second and third magnetic layers are layered,
2. The magnetic tape according to claim 1, wherein the orientation directions of the respective magnetic layers are substantially orthogonal to each other.