JPS59127486A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the S/N ratios of the 1st and the 2nd sound signals and to obtain compatibility with a normal system by recording a video signal and the 1st and the 2nd sound signals on a magnetic recording medium one after another by the 1st - the 3rd magnetic head with different recording azimuths. CONSTITUTION:Rotary magnetic heads HV1 and HV2, HR1 and HR2, and HL1 and HL2 are fitted adjacently at angular intervals of 180 deg.. In this case, the heads HR1 and HR2 are fitted in an X direction of rotation leading the heads HV1 and HV2, and the heads HL1 and HL2 also lead the heads HR1 and HR2. Further, the azimuth angles of the gaps gV1 and gV2, gR1 and gR2, and gL1 and gL2 of said heads are different from one another. Furthermore, the gaps gR1 and gR2 are wider than the gaps gV1 and gV2, and the gaps gL1 and gL2 are wider than the gaps gR1 and gR2. Then, recording tracks by those heads are recorded on a magnetic tape after another alternately at intervals of one field.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary head type VTR (video tape recorder) that records and reproduces a signal obtained by frequency modulating (FM modulating) an audio signal on a magnetic tape and superimposing it on a video signal. The present invention relates to a magnetic recording/reproducing device suitable for application to a recorder).

Background Art and Its Problems In a rotating head type VTR, a luminance signal YFM that is FM modulated on the high frequency side and a chroma signal CD that is converted on the low frequency side are synthesized (Fig. 1A shows an example of the frequency spectrum). ), recording is performed on an inclined track on a magnetic tape without placing a guard band using two (b) rotating magnetic heads having different azimuth angles.

In such a VT), the audio signal is usually recorded on continuous tracks in the running direction of the tape using a fixed head.
Recording is performed using a method similar to what is called an audio tape recorder.

However, in the case of the above-mentioned VTR, when the recording density is increased, the tape running speed becomes extremely slow.As a result, when recording audio signals, the relative speed between the fixed head and the tape becomes low, making it difficult to obtain a good audio signal. The disadvantage is that it is difficult to record.

Conventionally, as shown in the frequency spectrum of FIG. It has been proposed to multiplex and record on inclined tracks. In FIG. 1B, AFM is an FM modulated audio signal.

In this case, although the above-mentioned drawbacks are solved, there are the following drawbacks.

That is, since the audio signal is a multiplexed signal and crosstalk from adjacent tracks must be avoided, the carrier frequencies are ft, t (for the first audio signal recorded on the first track), fRl (for the first audio signal recorded on the first track), and fRl (for the first audio signal recorded on the first track). (for the second audio signal recorded on the first track), fL2 (for the first audio signal recorded on the second track adjacent to the first track), fR2 (for the second audio signal recorded on the second track)
(for audio signals) were selected, each with an interval of 150
It is said to be around KHz.

Therefore, for an FM modulated audio signal AFM, 60
It requires a wide band of about 0 KHz. Then, a low frequency conversion color signal CD, a modulated luminance signal YFM, a modulated audio signal AF
The frequency spectrum is arranged so that mutual interference with M does not occur. For example, as shown in FIG. 1B, the carrier frequency of the modulated luminance signal YFM is increased, the bands of the modulated luminance signal YFM and the low frequency conversion color signal CD are decreased, and the level of the modulated audio signal AFM is increased, for example, by the modulated It is limited to 1/10 to 1/20 of the luminance signal YFM.

Therefore, the carrier frequency of the modulated luminance signal YFM is increased, making it difficult to make the video signal compatible with the conventional system (the frequency spectrum of which is shown in FIG. 1A). Furthermore, since the level of the modulated audio signal AFM is limited, the S/N of the audio signal is degraded.

OBJECT OF THE INVENTION The present invention has been made in view of the above points.
/N is improved, and compatibility with normal systems can be maintained.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has first to third magnetic heads, the azimuth angles of the first to third magnetic heads are different from each other, and the first to third magnetic heads have different azimuth angles. The gap width of the head is gradually widened in this order, and the third to first magnetic heads are configured to sequentially scan the magnetic recording medium in this order, and during recording, a video signal is sent to the first magnetic head. first and second audio signals are supplied to the second and third magnetic heads, and the first audio signal, second audio signal, and video signal are superimposed on the magnetic recording medium. During reproduction, the first magnetic head reproduces the video signal from the magnetic recording medium, and the first and second audio signals are reproduced by the second and third magnetic heads, respectively. is reproduced.

The present invention is configured as described above, and the video signal, the first audio signal, and the second audio signal are recorded in a layered manner at different recording azimuths on the magnetic layer of the magnetic recording medium by the first to third magnetic heads. Since each signal is recorded and reproduced, the recording and reproduction of each signal has almost no effect on the recording and reproduction of other signals. Therefore, it is possible to record the first and second audio signals without limiting their bands and levels, and it is possible to improve the S/N ratio. Furthermore, video signals can be recorded and played back in the normal format, and compatibility with the normal format can be maintained regarding the video signals.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. 2 and subsequent figures.

In this example, as shown in FIG. 2, two rotating magnetic heads HV
I and HV2 are mounted with an angular spacing of about 180', and two rotating magnetic heads HRI and HR2 are mounted with an angular spacing of about 180' adjacent to the heads Hv1 and HV2, respectively, and K, this head HR
Two rotating magnetic heads HL are located close to I and HR2, respectively.
I and HL2 are attached with an angular spacing of approximately 18o0. In this case, heads HRI and HR2 are placed in front of heads HVI and HV2, respectively, so that this head f(v
The heads HLI and HL2 are mounted on the rotational direction X side of the heads HLI and HV2, respectively.

This head HR1 precedes HRl and )lR2.
and is attached on the rotation direction X side from HL2. Also,
(1) shows a magnetic tape, which is run in the Y direction while being swung diagonally over an angular range of approximately 180° by a tape guide drum (2).

As shown in FIG. 3, the azimuth angles (tilt angles with respect to the scanning direction or the direction perpendicular to the scanning direction) of the gaps gV1 and g2 of the heads HVI and HV2 are θVl and θy2&! Furthermore, the azimuth angles θR1 and θR2 of the gaps gH1 and HL2 of the heads HR1 and HL2 are made different from each other, and the heads HLI and H
The azimuth angles Ll and θL2 of the gap gL1 and HL2 of L□ are made to be different from each other. Further, the azimuth angles θVlyθR1 and θL1 are set to be different from each other, and the azimuth angles θV2sθR2 and θL2 are set to be different from each other. For example, Vl is 0 to +15
within °, 6V2 is within O~-15°, θR1k-! , -30
Within °~-45°, 6 R2 within +30°~+45°, θ
L1 is within +30° to +45°, θL2 is -30° to -4
Selected within 5° (king. - world j, θV1 = +7°,
θV2=7°, θR1=-30°, θR2=+30°
.

θ1,1=+45° and θ1,2=−45°.

Also, gaps gR1 and H between heads HR1 and HL2
The width of L2 is made wider than the width of gears gV1 and gV2 of heads HVI and HV2, and
The widths of gaps gL1 and 2520 between I and HL,2 are made wider than the widths of gaps gR1 and HL2 between HRx and HL2. For example, gaps gV1 and gV
2@t10.25~0.6μm, gap gR
1 and HL2 are 1 to 3 μm, and the gap gL1
and the width j of HL2 is 11.5 to 6 μm.

Usually, in magnetic recording or on the magnetic layer of a magnetic tape, recording can be performed to a depth approximately half the gear width of the magnetic head. Also, considering reproduction, the longer the recording wavelength (.), the deeper the recording can be made into the magnetic layer.
The purpose of making the width wider than 2 is to record the signals recorded by the heads HR1 and HL2 deeper into the magnetic layer of the magnetic tape (1). Similarly, the reason why the widths of the gaps gL1 and HL2 are made wider than the widths of the gaps gR1 and HL2 is to record the signals recorded by the heads HLI and HL2 deeper into the magnetic layer of the magnetic tape (1). be.

In addition, the head HVIIHV2νHR1+HR2+HL1
+HL2 is rotated once in one frame, for example.

And heads HL19HR19Hv1 and HL2 +
HR2+HV2 scans the magnetic tape (11) alternately every field. At this time, heads HR1 and HL2 precede husband heads HVI and H2, and heads HLI and HL2 respectively The magnetic tape (1) is scanned in advance of the heads HR1 and HL2.

Also, as will be described later, during recording, heads HVI and HV2
The frequency of the main No. 16 component is 3.5 to 101VLH.
Z, a video signal Sv' with a recording wavelength of 0.6 to 2 μm is supplied, a modulated audio signal ARFM with a main signal component frequency of 1 to 3 MHz and a recording wavelength of 3 to 9 μm is supplied to heads HRI and HL2, The heads HL1 and HL2 are supplied with modulated audio signals AI and FM whose main signal components have a frequency of 0.5 to 1.5 MHz and a recording wavelength of 6 to 18 μm.

In this case, the recording currents of heads HRI and HL2 are smaller than those of heads HVI and HV2, and the recording currents of heads HL1 and HL2 are smaller than those of heads HRI and )(
Based on the recorded current of R2, it is determined to be a dog. And in this case 1.
Each signal is recorded in saturation, for example, and the heads HLI and HL
2. A recording current larger than the saturation recording current when recording alone is applied to HRI and HL2.

After all, on the magnetic tape [1], as shown in FIG.
Alternately for each field, head HL11HR1+HVI
Recording track Lrl and head HL2νHR2 by K
+HV2 recording tracks T2 are sequentially formed. Then, the video signal SV' is recorded on the recording track T1+T2.
, modulated audio signals ARFM and ALFM are recorded in an overlapping manner at different recording azimuths. That is, FIG. 5A shows recording track 1 by the heads HLl, tHRl, and HVl, but when observing this cross section, as shown in FIG. 5B, first, the modulated audio signal A is
The LFM is recorded to the lower part of the magnetic layer (1a) of the magnetic tape CI), and the modulated audio signal A is produced by the head HR1.
The RFM is recorded to the middle layer of the magnetic layer (1a), and then the video signal SV is recorded to the upper layer of the magnetic layer (1a) by the head HvI. Note that the same applies to track T2. In FIG. 5B, (lb) is the pace.

Here, FIG. 6 shows the relationship between recording current (1.5 MHz) and reproduction output.

The solid line a in the figure shows the reproduction output when no overlapping recording is performed. Also, the same figure shows solid lines and broken lines b.
' indicates the playback output from the middle layer in the case of overlapping recording; the solid line b indicates the case where the video signal SV' recorded in the upper layer is only the modulated luminance signal YFM, and the broken line b' is the video signal Sv' recorded in the upper layer
is the case where the signal is a composite signal of the modulated luminance signal YFM and the low frequency conversion color signal CD. In addition, the solid line C and the broken line C' in the same figure indicate the reproduction output from the lower layer in the case of overlapping recording, and the solid line C indicates that the video signal S' recorded on the upper layer is a modulated luminance signal. In the case of YFM only,
A broken line C' indicates a case where the video signal Sv' recorded on the upper layer is a composite signal of the modulated luminance signal YFM and the low frequency conversion color signal CD.

Further, during reproduction, the head HLl+HR1+HV1 and the head HL2+HR2+HV4 scan the recording tracks T1 and 'v2, respectively. Therefore, the heads HLI and HL2 reproduce the modulated sound P1 #ALFM from the recording tracks TI and T2, respectively. In addition, heads HRI and HR2 each record track rr1.
The modulated audio signal ARFM is reproduced from T2. Furthermore, heads HVI and HV2 each record track T1.
and T2, the video signal SV' is reproduced.

What is shown in FIG. 7 is the recording system and reproduction system circuits in this example.

In the figure, (100V) is a recording system circuit for the video signal Sv, and the video signal sy is supplied to the terminal 1ll). This video signal SV is a low/low filter tl.
a to obtain a luminance signal Y, which is supplied to the FM modulator α4 through a pre-emphasis circuit (131).In the FM modulator circle, for example, the white beak is 5.2 MHz and the sync tip is 3.8 MHz. The luminance signal Y is FM-modulated so that the modulated luminance signal YFM is obtained.This modulated luminance signal YFM is passed through the bypass filter α9.
After being band-limited by the amplifier (16) and further amplified by the amplifier (16), the signal is supplied to the combiner (Q7).

The video signal SV supplied to the terminal αυ is supplied to a bandpass filter to obtain a color signal C, which is supplied to a frequency converter (19).
1 is supplied with a conversion signal from an oscillation circuit, and a low-frequency conversion color signal CD having a carrier frequency of, for example, 688 KHz is obtained. This low-pass converted color signal CD is filtered by a low-pass filter (
After being band-limited through 21J and further amplified by amplifier Q, it is supplied to the combiner σ power. In this case, as shown in the spectrum in FIG.
This is to prevent data from being recorded in the middle or lower layer.

The synthesized signal (hereinafter referred to as video signal Sv') of the modulated luminance signal YFM and the low-frequency converted color signal CD obtained from the synthesizer aη. The recording wavelength is 0.6 to 2 μm.) is the changeover switch and rotary transformer (to).
The signal is supplied to the head HVI through the changeover switch (c) and the rotary transformer (to), and is also supplied to the head HV2 through the changeover switch (c) and the rotary transformer (to). Changeover switch (c) and (25)
are respectively connected to the R side during recording and to the P side during playback.

In FIG. 7, (100L) is a recording system circuit for the first audio signal (left signal for stereo, main signal for dual audio) AL. The first audio signal AL is connected to the terminal (31L).
is supplied. This first audio signal AI is the terminal (31L
) The signal is supplied to a synthesizer (34L) through a color low-pass filter (32L) and a compression circuit (33L) that constitutes a noise reduction circuit. Further, Kasumi is an oscillator for obtaining a pilot signal 5PILOT for jitter correction. When the audible frequency is 20KH2, an oscillation signal of, for example, 25 to 3QKHz is obtained from this oscillator 69, and this is sent to the synthesizer (3QKHz) as a pilot signal 5PILOT.
4L).

A composite signal of the first audio signal AL and pilot signals 8PII and OT obtained from the synthesizer (34L) is supplied to the FM modulator (36L). And this FM modulator (
36L), this composite signal has a carrier frequency of 1 MHz and a frequency deviation of ±150 fG (FM
A modulated audio signal AI, FM (shown in FIG. 1C) is obtained. This modulated audio signal ALFM has a main signal component frequency of 0.5 to 1.5 MHz and a recording wavelength of 6 MHz.
~18 μm. This modulated audio signal ALFM is supplied to an amplifier (38L) through a bandpass filter (37L) for removing harmonics. The modulated audio signal ALFM amplified by the amplifier (38L) is then transferred to the changeover switch (39
This amplified modulated audio signal ALFM is supplied to the head HL2 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.

In addition, in FIG. 7, (100)L) is the second audio signal (
(Right signal for stereo, sub signal for dual audio) This is the AR recording circuit. A second audio signal AR is supplied to the terminal (31)L). This second audio signal AR is transmitted to the terminal (31
R) is supplied to a synthesizer (34)L) through a 0-lotus filter (32R) and a compression circuit (33R) that constitutes a noise reduction circuit. Also, this synthesizer (3
For the fourth aid, there is a pilot signal 5PILO from the oscillator (c).
T is supplied.

The composite signal of @22 audio signal AR and pilot signal sp I LOT obtained from this synthesizer (34R) is supplied to an FM modulator (36)L). In this F'M modulator (361(), this composite signal is
ffi wave ifi is FM modulated with a frequency deviation of ±150 KHz, and the modulated audio signal AR
FM (illustrated in FIG. 1C) is obtained. This modulated audio signal ARFM has a main signal component frequency of 1 to 3 MHz,
The recording wavelength is 3 to 9 μm. This modulated audio signal ARFM
is supplied to the amplifier (38k) through the harmonic removal pass filter (37R).
The modulated audio signal ARFM amplified by 38) t) is transmitted through a changeover switch (391()
) and this amplified modulated audio signal ARFM is supplied to the head HR2 through a changeover switch (41R) and a rotary transformer (42R).
supplied to Selector switch (39FL) and (41R
) are respectively connected to the R side during recording and to the P side during playback.

When recording, selector switch (c) j (251, (39L)
), (39K).

(41L) and (41R) are respectively switched to the R side, so as mentioned above, the video signal Sv' is supplied to the heads HVI and HV2, the modulated audio signal ALFM is supplied to the heads HLI and HL2, and the head HRI and H
A modulated audio signal ARFM is supplied to R2. Therefore,
As shown in FIG. 4, on one magnetic tape (1), heads HVl + HL 1 + H are arranged alternately every field.
Recording track III l and head HV2 by R1
+HL2 +HR2 recording tracks T2 are formed intermittently.

Further, in FIG. 7, (200V) is a video signal reproduction system circuit. As described above, the video signal Sv reproduced by the head HVI from the recording track T1 is transmitted to the amplifier (
501) to the switch circuit 611. Further, as described above, the video signal Sv reproduced by the head HV2 from the recording track T2 is supplied to the switch circuit 511 through the amplifier (50z). switch circuit 61
1 is supplied with a switching control signal 80 obtained from a terminal (51a) according to the rotational positions of the heads HVI and HV2, and the switching is controlled. And this switch circuit 6
From υ, video signals SV' reproduced by heads HVI and HV2 are obtained alternately every l field.

The video signal Sv' obtained from this switch circuit port is supplied to a bypass filter (521), and a modulated luminance signal YFM is obtained from these six bypass filters.This modulated luminance signal YFM is passed through a limiter circuit A luminance signal Y is obtained from the FM demodulator □□□.This luminance signal Y is supplied to the synthesizer circuit through the D1FF1 circuit.

In addition, the video signal S■' obtained from the switch circuit 6υ
is supplied to a low-pass filter 1571, and a low-pass converted color signal CD is obtained from this low-pass filter 5D.

This low frequency converted color signal CD is supplied to the frequency converter. When this frequency converter is used, conversion signals are supplied from an AFC and APC circuit (automatic frequency and phase control circuit), and the low frequency conversion color signal CD has a carrier frequency of, for example, 3°58.
It is converted into a color signal C of MHz. This color signal C is supplied to a synthesizer (G) through a bandpass filter U.

In the combiner (support), the luminance signal Y and the color signal C are combined, and a video signal S■ is obtained at the output terminal 1611.

Also, in FIG. 7, (200L) is the first audio signal AI
This is a reproduction system circuit for . As described above, the modulated audio signal ALF generated by the head HLI from the recording track T1
M has a center frequency of approximately IM through an amplifier (71L1)
Hz bandpass filter (72L1). The modulated audio signal ALFM from this bandpass filter (72Ll) is sent to a limiter circuit (73L1).
The signal is supplied to the FM demodulator (74Lt) through the FM demodulator (74Lt). This F
A composite signal of the first audio signal AI and pilot signals 5PII and OT is obtained from the M demodulator (74Lt), and this is supplied to the terminal of A 9111 of the switch (9) path (75L).

Further, as mentioned above, the modulated audio signal ALFM reproduced from the recording track 'l'2 by the head HL2 is transmitted to the amplifier (7).
1L2) and is supplied to a cold pass filter (72L2) having a center frequency of approximately IMHz. And the variable X from the cono bandpass filter (72L2)
The f voice (g ALFM) is supplied to the FM demodulator (74L2) through the limiter circuit (73L2). From this FM demodulator (74L2), the first voice signal AI and the signal SP I LOT are synthesized. A signal is obtained and supplied to the B side terminal of the switch circuit (75L).

The switching circuit (75L) is supplied with a switching side (G SCL) obtained according to the rotational positions of the heads HLI and HL2 from a terminal (75La), and the switching is controlled.

That is, during one field period when the head HLI scans the recording track T1, the terminal is switched to the A side, and during the other one field period when the head HL2 scans the recording track '1'2. is switched to the B side terminal.

Therefore, from this switch circuit (75L), a composite signal of the first audio signal AL obtained from the FM demodulators (74L1) and (74L2) and the pilot signals 5PII and OT is obtained alternately for each field.

This composite signal is supplied to a low-pass filter (76L), and this low-pass filter (76L) outputs the first audio signal A.
I, is obtained and supplied to the combiner (77L).

Further, the composite signal obtained from the switch circuit (75L) is supplied to a bandpass filter (78L) whose center frequency is approximately equal to that of the pilot signal 8P I LOT, and from this bandpass filter (78L), the pilot signal 5P I LOT is
PILOT is obtained. This pilot signal 5PILO
T is supplied to a frequency discriminator (79L), and a jitter detection signal 5JIL is obtained from this frequency discriminator (79L).

This jitter detection signal 5JIL is inverter (80L)
After being inverted by the level adjustment semi-fixed resistor (81L
) is supplied to the synthesizer (77L).

In the synthesizer (77L), a low-pass filter (76
A signal corresponding to the jitter detection signal 5JIL is calculated from the first audio signal AL supplied from L), and the jitter component included in the first audio signal AL is canceled out. Therefore,
This synthesizer (77L) removes the jitter component from the first
An audio signal AL is obtained, which is sent to an output terminal (83L) through an expander (82L) that constitutes a noise reduction circuit.
).

Further, in FIG. 7, (200)t) is a circuit for reproducing the second audio signal AR. As described above, the modulated audio signal AR reproduced by the head HR1 from the recording track T1
FM is an amplifier (71R1>Even if the center frequency is approximately 1.
The signal is supplied to a bandpass filter (72R1) with a frequency of 4 MHz. And this band pass filter (72R
The modulated audio i = signal ARFM from 1) is transmitted through a limiter circuit (7
3Rx) to the FM demodulator (74R1). This FM demodulator (74R1) outputs a second audio signal AR.
and a composite signal of the pilot signal 5PILOT is obtained,
This is supplied to the A gllll terminal of the switch circuit (75)t).

Further, as described above, the head HR is moved from the recording track T2.
The modulated audio signal ARFM reproduced by the amplifier (71R
2) is supplied to a band pass filter (72R2) whose center frequency is approximately 1.4 MHz. Then, the modulated audio signal ARFM from the bandpass filter (72R2) passes through the limiter circuit (73R2).
It is supplied to the M demodulator (74R2). This FM demodulator (
74R2), a composite signal of the second audio signal AR and pilot signal SP I LOT is obtained, and this is supplied to the B-side terminal of the switch circuit (75R).

The switch circuit (75)t) is supplied with a switching control signal SCR obtained from a terminal (75Ra) according to the rotational positions of the heads HRI and HR2, and the switching is controlled.

That is, during one field period when the head HRI is scanning the recording track T1, the terminal is switched to the A side, and the head H
During the other one field period when R2 is scanning the recording track T2', the terminal is switched to the B side.

Therefore, from this switch circuit (75K), a composite signal of the second audio signal AR obtained from the FM demodulators (74R1) and (74R2) and the pilot signal Sp r LOT is obtained alternately for each field.

This composite signal is supplied to a low-pass filter (76K), and the second audio signal A is output from this low-pass filter (76R).
R is obtained, which is fed to the combiner (77)t).

In addition, the composite signal obtained from the switch (b) path (75R) is supplied to a bandpass filter (78)t) whose center frequency is approximately equal to that of the pilot signal 5PILOT,
A pilot signal 5PILOT is obtained from the conova/dopass filter (78R). This pilot signal SP
I LOT is supplied to a frequency discriminator (79R), and this frequency discriminator (79R) outputs a jitter detection signal 5JIR.
is obtained.

This jitter detection signal 5JIR is inverter (80K)
After being inverted by the level adjustment semi-fixed resistor (81R
) is supplied to the combiner (77R).

In the synthesizer (77) t), a low-pass filter (7
A signal corresponding to the jitter detection signal 5JIR is subtracted from the second audio signal AR supplied from 61() to cancel out the jitter component contained in the second audio signal AR. Therefore, the second audio signal AR from which the jitter component has been removed is obtained from this synthesizer (77R), and this is passed through the output terminal (
83K).

The present example is configured as described above, and during recording, video signal No. 18 Sv, first audio signal AL, and second audio signal AR are supplied to terminals αυ, (3LL) and (31)L), respectively.
- Rad I (vt and HV2 are supplied with video (i number Sv'), heads HL1 and HL2 are supplied with modulated audio signal AL
FM is supplied, and the heads HR1 and HR2 are supplied with a modulated audio signal ARFM. Therefore, as shown in FIG. 4, on the magnetic tape (1), a recording track T1 by the head HLl +HR1rHVl and a recording track T2 by the head HL2 +HR2+HV2 are sequentially formed alternately for each field. And recording track T
I and 'r2 have a video signal Sυ and a modulated audio signal AL.
FM and ARFM are recorded overlappingly at different recording azimuths.

Further, during reproduction, the head HL hHR1+HVl and the heads HL2+HR2 and H2 scan the recording tracks Tl and '2'2, respectively. And head HL
] and HL2 reproduce the modulated audio signal ALFM, heads HRI and HR2 reproduce the modulated audio signal ARFM, and heads Potter and HV2 reproduce the video signal Sv'. Therefore, output terminals II), (83L) and (83
R), a video signal Sv, a first audio signal AL, and a second audio signal AR are obtained, respectively.

According to this example, the video signal SV', the modulated audio signal ALF
M and ARFM each use a separate head to record magnetic tape (1
) are recorded on the magnetic layer (1a) at different recording azimuths, and then reproduced. Therefore, the recording and reproducing of each signal hardly affects the recording and reproducing of other signals. Therefore, it is possible to record the modulated audio signal ALFM*ARFM without limiting the band and level, and the audio signal A
8/N of R+AL 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 r ARFM, it may be in other signal forms ( )'CM, etc.).

In the above-mentioned embodiment, the present invention is applied to a rotating head type VTR, but it can be similarly applied to a fixed head type VTR. Furthermore, the present invention can be similarly applied to devices that use other media than magnetic tape (such as magnetic disks) as magnetic recording media.

Effects of the Invention According to the present invention described above, the video signal, the first audio signal, and the second audio signal are recorded in different recording azimuths on the magnetic layer of the magnetic recording medium by the first to third magnetic heads. Since each signal is recorded and reproduced in a state of rest, the recording and reproduction of each signal has almost no effect on the recording and reproduction of other signals. Therefore, it is possible to record the first and second back door signals without limiting their bands and levels, and it is possible to improve the S/N ratio. Furthermore, for the same reason, video signals can be recorded and played back using the normal method (in the above embodiment, the frequency of the modulated luminance signal YFM is raised), and compatibility with the normal method is maintained for video signals. be able to.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the frequency spectrum of a recording signal, FIG. 2 is a diagram showing a rotary head device in an embodiment of the present invention, and FIG. 3 is a diagram showing the state of the gap of the rotary magnetic head. Figure 4 is a diagram showing the recording pattern of magnetic tape.
FIG. 5 is a diagram for explaining the recording state on the magnetic tape;
FIG. 6 is a diagram showing recording and reproducing characteristics, and FIG. 7 is a circuit configuration diagram of an embodiment of the present invention. (1) is a magnetic tape, (2) is a tape guide drum, (1)
00L). (100)t) & Hee (100V) Hao'! r Recording system circuit for the first audio 'IN' issue, the second audio signal, and each video issue (200L). (200V) and (200V) are the circuits for the reproduction system of the first audio signal, the second audio signal, and the video signal, respectively, HLl, H
L2°HR1+HR29HV1 and HV2 are rotating magnetic heads, respectively. Fig. 1 81 frequency (Hf) Fig. 2 Fig. 3 Fig. 4 Fig. 6 Deep recording scissors charging (mAPP)

Claims (1)

[Claims] It has first to third magnetic heads, the first to third magnetic heads have different azimuth angles, and the first to third magnetic heads have different azimuth angles.
The gap width of the third magnetic head is gradually widened in this order, and the third to first magnetic heads scan the magnetic recording medium sequentially in this order, and during recording, the first magnetic head A video signal is supplied to the head, first and second audio signals are supplied to the second and third magnetic heads, respectively, and the first audio signal, the second audio signal, and the second audio signal are recorded on the magnetic recording medium. Video signals are recorded in an overlapping manner, and during reproduction, the first magnetic head reproduces the video signal from the magnetic recording medium, and the second and third magnetic heads reproduce the video signal from the first and third magnetic heads, respectively. 1. A magnetic recording and reproducing device characterized in that an audio signal of No. 2 is reproduced.