JP2656846B2 - Magnetic recording / reproducing device - Google Patents

Description

The present invention relates to a magnetic recording / reproducing device such as a video tape recorder, and more particularly, to a different video signal transmission system such as an NTSC system and a PAL system, and The present invention relates to a magnetic recording / reproducing apparatus capable of performing high-fidelity recording and reproduction of an audio signal in a normal recording mode.

[Conventional technology]

In a video tape recorder (hereinafter referred to as HiFiVTR) for recording high-quality FM audio signals, NTSC (525 scanning lines per frame, transmitting video signals at 60 fields per second) and PAL / SECAM ( VHS (registered trademark) standard is defined for each of 625 scanning lines per frame and transmitting a video signal of 50 fields per second). According to this, the HiFi VTR has a rotary head dedicated to audio, converts a two-channel audio signal into a two-frequency FM signal, pre-records the video signal, and then superimposes and records a specified video signal by the video rotary head. It has become.

Table 1 below shows the standard values of the recording track values based on the recording track patterns of FIGS. 4 (a) to 4 (c).
However, in FIGS. 4A to 4C, VT indicates a video track, and AT indicates an audio track superimposed and recorded on the video track. NTSC or PAL / SEC
AM mode standard recording mode in the case of (hereinafter, SP mode hereinafter), as shown in 4 (a), a video track VT ₁
Audio tracks AT from the track center, and each of A ₁ the distance to the ends of the ([mu] m) and A ₂ (μm).
Moreover, long-time recording mode of the NTSC system case (hereinafter, EP mode hereinafter), as shown in FIG. 4 (b), the overlapping width video track VT ₂ and audio track AT ₂ B (mu
m). Moreover, long-time recording mode PAL · SECAM scheme case (hereinafter, LP mode hereinafter), as shown in FIG. 4 (c), the distance from the track center of the video track VT ₃ to both ends of the audio track AT ₃ The respective A
₁ (μm) and A ₂ (μm).

Conventionally, HiFiVTR to meet the standards described in Table 1
Are compatible with NTSC, PAL / SECAM, and are compatible with all NTSC / PAL / SECAM formats.Record and playback in standard recording mode and long-time recording mode HiFiVTR compatible with is on the development line.

A ₁ , A ₂ , and B in Table ₁ are represented by the following equations, respectively. However, the dimension from the video recording track center in the SP mode, that is, the center of the video head tracing this to the lower end of the video head is TW / 2.
(Μm), the dimension from the video recording track center in the LP mode, that is, the center of the video head for tracing this to the lower end of the video head is TW ′ / 2 (μm), the head width of the audio head is AHW (μm), and SP The track pitch in the mode is TP (μm), the track pitch in the LP mode is TP ′ (μm), the track pitch in the EP mode is TP ″ (μm), the audio track width in the SP mode is ATW (μm), The audio track width in LP mode is ATW '(μm), the lower step between the SP mode recording video head and the audio head is DN (μm), and the lower step between the LP mode recording video head and the audio head is DN' (μm). The difference between the lower end of the video head for recording in EP mode and the audio head is DN ″ (μm). The mounting phase angle in the Oheddo and θ (deg).

[In case of SP mode based on NTSC / PAL / SECAM]

A ₁ = TW / 2−DN + θ / 360 × 2TP… A ₂ = ATW−A ₁ = ATW−A ₁ … [In case of NTSC compliant EP mode] B = TP ″ − | DN ″ −θ / 360 × 2TP ″ −2TP ″ |… [In the case of LP mode conforming to the PAL / SECAM formula] A ₁ = TW '/ 2-DN' + (θ + 180) / 360 × 2TP '… A ₂ = ATW'-A ₁ … A ₁ + A ₂ ≧ 14 μm and A ₁
≧ TP '/ 2 when _{A 2 ≦ TP' / 2,} A 1 ≦ TP '/ 2 when A ₂ ≧ TP'
/ 2.

FIGS. 5 (a) and 5 (b) show an example of a head arrangement in a HiFi VTR conforming to the NTSC system designed based on the above-mentioned standard values and each formula. This NTSC HiFi VTR is a 2-channel rotating head for recording video signals in SP mode.
And VR _S · VL _S, and includes a rotary head VR _E · VL _E of two channels for recording in EP mode, the two channel audio dedicated rotary head and AR · AL. As shown in FIG. 5 (a), provided with rotary head VL _S and the rotating head VR _S close together, the mounting phase angle between the voice-only rotary head AR 12
0 ゜. Also, rotating head VR _S and rotating head VL _E
The rotary head VL In the _S · VR _E and symmetrical position, likewise provided close to each other, the attachment phase angle between the voice-only rotary head AL is at an 120 ° and. As shown in FIG. 5 (b), the head width of the rotary head VR _S · VL _S, respectively
46 μm and 58 μm are set. Rotating head VR _E・ VL _E
The head width of both is 25μm, and the rotary head AR for audio only
・ The head width of each AL is set to 28 μm. Mounting height of each lower end of the rotary head VR _E · VL _E is rotary head VR _S
· VL is 6μm set higher than the mounting height of each lower end of the _S. Further, the mounting height of each lower end of the voice-only rotary head AR · AL, from the lower end of the mounting height of the rotary head VR _S · VL _S
52.5 μm higher.

FIG. 6A shows a recording track pattern on the magnetic tape of the HiFi VTR for NTSC having the above configuration. The recording tracks T _RS and T _LS are rotating heads VR _S and V in SP mode.
Formed by L _S, the recording track T _RE · T _LE are those formed by the rotary head VR _E · VL _E in EP mode. The recording tracks _TAR and _TAL are rotary heads exclusively for audio.
It was formed by AR / AL. In the case of the SP mode recording track pattern, if the head width of the pair is different, it is necessary to verify the positional relationship with the head with the narrower width. TW / 2 = 23 μm, TP = 58 μm, DN = 54.5μ
m, θ = 120 °, and AHW = 28 μm are substituted and calculated. The recording track pattern in the EP mode is expressed by TP ″ = 19.3 μm, DN ′ = 46.5 μm, θ = 120
It is obtained by substituting ゜ and calculating.

Furthermore, PA designed based on the above-mentioned standard value and each formula
FIGS. 7A and 7B show an example of a head arrangement in a HiFi VTR based on the L-SECAM system. This HiFiVT for PAL / SECAM
R is a two-channel rotary head VR _S / VL _S for recording video signals in SP mode, a two-channel rotary head VR _L / VL _L for recording in LP mode, and a two-channel audio-only rotary head. It has a head AR and AL. Each head VR
_{S · VL S · VR L ·} VL L · AR · AL width, and attachment phase angle NT
It is the same as for SC. The mounting height of each lower end of the rotary heads VR _E / VL _E is also set to be 6 μm higher than the mounting height of each lower end of the rotary heads VR _S / VL _S , as shown in FIG. Have been. In addition, the mounting height of each lower end of the voice-only rotary head AR / AL is
Is 41.5μm set higher than the mounting height of each lower end of the VR _S · VL _S.

FIG. 8A shows a recording track pattern on the magnetic tape of the PAL / SECAM HiFi VTR having the above configuration. Recording track T _Rs · T _LS is formed by a rotary head VR _S · VL _S in SP mode, the recording track T _RL · T _LL is
And it is formed by a rotary head VR _E · VL _E in EP mode. The recording tracks T _AR and T _AL are formed by the audio-only rotary heads AR and AL. The recording track pattern in SP mode is as follows: TW / 2 = 23μ
m, TP = 49μm, DN = 41.5μm, θ = 120 °, ATW = 28μ
It is obtained by substituting m and calculating. The recording track pattern in the LP mode is expressed by the following equation: TW ′ / 2 = 23
μm, DN ′ = 35.5 μm, θ = 120 °, TP ′ = 16.3 μm, A
It is obtained by substituting and calculating TW = 24.5 μm.

For both NTSC and PAL / SECAM, rotary head VR _S / VL _S , rotary head VR _E / VL _E , rotary head VR _L / VL _L
Each of the audio-only circuit heads AR and AL performs recording and reproduction at an inverted azimuth angle.

[Problems to be solved by the invention]

However, for example, the head arrangement is shown in FIGS.
Assuming that recording is performed while switching the signal processing to the PAL / SECAM method in this state, the recording track pattern shown in FIG. 6B may deviate significantly from the standard shown in Table 1, And other HiFi that conforms to PAL / SECAM
There is a problem that compatibility in recording and reproduction with a VTR is poor. The basis is shown below. SP in Fig. 6 (b)
The mode recording track pattern is: TW / 2 = 23μ
m, TP = 49μm, DN = 52.5μm, θ = 120 °, ATW = 28μ
It is obtained by substituting m and calculating. In this recording track pattern, A ₁ = 31.6 μm, and A ₁ ≧
It can be seen that there is a large deviation from the standard value of 10μ.
Further, the SAL of the HiFi VTR for PAL / SECAM shown in FIG.
In the P mode recording track pattern, A ₁ = 14.16μ
m, and it can be seen that the compatibility shift is large as compared with the above A ₁ = 31.6 μm. Further, A ₁ · A ₂ in LP mode recording track pattern of FIG. 6 (b) is within the standard, 8
Comparing with the LP mode recording track pattern of FIG.

On the other hand, for example, when recording is performed while switching the signal processing to the NTSC system while the head arrangement is the same as in FIGS. 7A and 7B, the recording track pattern shown in FIG. In addition, there is a problem that the standard may be greatly deviated from the standard shown in Table 1, and that compatibility with other HiFi VTRs conforming to the NTSC system is poor in recording and reproduction.
In particular, the EP mode recording track pattern of FIG. 8B will be described. The EP mode recording track pattern can be expressed as follows: TP ″ = 19.3 μm, DN ″ = 35.5 μm,
It is obtained by substituting ゜. In this recording track pattern, B = 32.7 μm, and it can be seen that B is significantly deviated from the standard value of B ≧ 16 μm. Furthermore,
In the EP mode recording track pattern of the HiFi VTR for NTSC shown in FIG. 6 (a), B = 14.27 μm,
It can be seen that the compatibility shift is larger than B = 3,27 μm.

As described above, in the conventional head arrangement, NTSC / PAL / S
There is a problem that it is impossible to realize a HiFi VTR compatible with all ECAM systems and compatible with each of the standard recording mode and the long-time recording mode.

[Means for solving the problem]

In order to solve the above-mentioned problems, a magnetic recording / reproducing apparatus according to claim 1 performs recording / reproducing of a video signal in a standard recording mode, and an azimuth angle of a head gap is set to be positive and negative, respectively. The recording / reproducing of the video signal in the long-time mode with the first group rotary head of the two channels, the head width is set almost equal to the recording track width in the long-time recording mode of the PAL / SECAM system, and the azimuth angle of the head gap And a two-channel second group rotary head in which each is set to positive and negative, and a two-channel rotary head in which the FM audio signal is recorded and reproduced in each of the above modes, and the azimuth angle of the head gap is set to positive and negative, respectively. , A head width AHW (μm) of the third group rotary head, and a lower end step DN with the first group rotary head.
(Μm), the phase angle of attachment to the first and second group rotary heads is θ (deg), and the lower end of the first group rotary head from the center of the video recording track in the standard recording mode, ie, the center of the video head tracing this. Up to TW / 2 (μm) and track pitch TP (μm) PA
The length from the center of the video recording track in the long-time recording mode of the L-SECAM system, that is, the center of the video head for tracing this, to the lower end of the second group rotary head is T.
W ′ / 2 (μm), the lower end step between the second group rotary head and the second group rotary head is DN ′ (μm), and the track pitch is TP ′ (μm).
m), when the track width of the FM audio signal is ATW ′ (μm), first, 10 ≦ TW / 2−DN + θ / 360 × 2TP ≦ 29 10 ≦ AHW− {TW / 2−DN + θ / 360 × 2TP} ≦ 29, and then 1 ≦ | TW ′ / 2−DN ′ + (θ + 180) / 360 × 2TP ′ | 13 ≦ ATW ′ − ｛TW ′ / 2−DN ′ + (θ + 180) / 360 × 2T
It is characterized in that it is set so that P '｝ ATW' ≧ 14.

According to a second aspect of the present invention, there is provided a magnetic recording / reproducing apparatus in which a head width is set substantially equal to a recording track width in an NTSC long time recording mode, and a NTSC long time recording is performed. A fourth group rotary head of two channels in which recording and reproduction of a video signal are exclusively performed in the mode and the azimuth angle of the head gap is set to positive and negative, respectively; The lower step between the rotating head and the third group rotating head is D
When N ″ (μm) and TP ″ (μm) of the track pitch are set, 16 ≦ TP ″ − | DN ″ −θ / −360 × 2TP ″ −2TP ″ | is characterized.

(Operation)

According to the configuration of the first aspect, in the standard recording mode of each of the NTSC, PAL and SECAM systems, the FM audio signal is azimuth-recorded in advance by the two-channel third-group rotating head, and the video signal is recorded in the first group. The rotating head performs superimposed recording so as to satisfy the unified standard of the VHS-FM audio signal recording system and not to lose recording / playback compatibility. Also, PAL ・ S
In the long-time recording mode of the ECAM system, two FM audio signals
Azimuth recording is performed in advance by the third group rotating head of the channel, and the video signal is VH-recorded by the second group rotating head.
Superimposed recording is performed so as to satisfy the unified standard of the S-FM audio signal recording method and to maintain compatibility of recording and reproduction. Since the head width of the second group rotary head is set substantially equal to the recording track width in the long recording mode of the PAL / SECAM system and is larger than the recording track width in the long recording mode of the NTSC system, the long recording time of the NTSC system is used. Playback compatibility in the mode is not lost.

According to the second aspect of the present invention, in the standard recording mode of each of the NTSC, PAL and SECAM systems, the FM audio signal is azimuth-recorded in advance by the two-channel third group rotary head, and the video signal is recorded in the first group. The rotating head performs superimposed recording so as to satisfy the unified standard of the VHS-FM audio signal recording system and not to lose recording / playback compatibility. Also, PAL ・ S
Even in the long-time recording mode of the ECAM system, the FM audio signal is azimuth-recorded in advance by the third group rotary head of two channels, and the video signal is recorded by the second group rotary head.
Meet the unified standard of VHS-FM audio signal recording method, and
Superimposed recording is performed so that compatibility of recording and reproduction is not lost.
In the long-time recording mode of the NTSC system, since the fourth group rotary head for storing and reproducing the video signal is provided exclusively, the FM audio signal is azimuth-recorded in advance by the third group rotary head of two channels. After the video signal
By the group rotating head, superimposed recording is performed so as to satisfy the unified standard of the VHS-FM audio signal recording method and to maintain the compatibility of recording and reproduction. The provision of the fourth group rotary head improves the recording / reproducing efficiency and the characteristic of eliminating crosstalk from adjacent tracks in the long-term recording mode of the NTSC system.

Embodiment 1 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

HiFiVTR as a magnetic recording and reproducing device according to the present invention,
As shown in FIG. 1A, a two-channel rotary head VR _S / VL _S (first group rotary head) for recording a video signal in a standard recording mode (hereinafter referred to as SP mode), and NT
SC mode long-time recording mode (hereinafter referred to as EP mode) and PAL / SECAM type long-time recording mode (hereinafter
LP mode referred to as) the rotation of the two channels for recording by the head VR _E · VL _E (the second group rotating head), two channel audio dedicated rotary head for recording in advance the FM audio signal to the video signal A rotary drum 1 provided with an AR / AL (third group rotary head) is provided. The SP, EP, and LP modes are normal modes and are distinguished from special modes such as trick play. The audio-only rotary head AR / AL performs recording and reproduction in the normal mode, and does not operate in the special mode. Furthermore, the rotary head _{VR S · VL S · VR E} · VL E is adapted to operate at the time of trick play.

Rotary head VR _S · VL _S, rotary head VR _E · VL _E, and voice-only rotary head AR · AL in each of the combinations, the azimuth angle of the head gap is set to a positive and negative.
Furthermore, provided the rotary head VL _S and the rotating head VR _E close to each other, the attachment phase angle between the voice-only rotary head AR
120 ゜. Further, the rotary head VR _S · VR _E and rotating the rotating head VR _S that is in the symmetrical position head VL _E also provided close Te each other, attaching the phase angle between the voice-only rotary head AL, like the 120 ゜.

On the other hand, it is shown in the head width and mounting height of each head _{VR S · VL S · VR E} · VL E · AR · AL FIG. 1 (b). Rotating head VR
_S · VL head width, respectively 46μm of _S, 58 .mu.m, the head width of the rotary head VR _E · VL _E are both set 25 [mu] m, the head width of the voice-only rotary head AR · AL also both 28 .mu.m.
The rotary head VR _E · VL _E, the lower end mounting height of the rotary head VR _S · VL _S, and voice-only rotary head AR · AL is made identical in each combination, the rotary head VR
Mounting height of the lower end of the _E · VL _E is 6μm set higher than the mounting height of the lower end of the rotary head VR _S · VL _S. Further, the mounting height of the lower end of the voice-only rotary head AR · AL is, 47.5 is set higher than the lower end of the mounting height of the rotary head VR _S · VL _S.

The basis for setting the numerical value of 47.5 μm will be described below. FIG. 5B described in the section of the prior art has a head arrangement.
In the case of the NTSC HiFi VTR, A ₂ = 18.83 μm in the SP mode recording track pattern shown in FIG. According to the standard shown in Table 1, A ₂ ≧ 10 μm, so A ₂ has a margin of 8.83 μm with respect to the standard value. That is, it is possible to 8.83μm expand the value of A _{1. That, A 1 = TW / 2-} DN + θ / in 360 × 2TP aforementioned formula of the rotation head VR _S · VL _S and the voice dedicated rotary head AR
・ Lower step DN with AL (52.5μ from Fig. 5 (b))
If values other than m) are set in the same way, the lower end step DN is set to 8.
That is, it can be reduced by 83 μm. Therefore, the condition of DN ≧ 52.5−83.3 = 43.46 μm is obtained.

Next, in the recording track pattern of the EP mode shown in FIG. 6A, B = 14.27 μm, and B ≧ 16 μm
It deviates from the standard of m. In this case, B = TP ″ −
In the above equation of | DN ″ −θ / 360 × 2TP ″ −2TP ″ |, the calculated value of DN ″ −θ / 360 × 2TP ″ −2TP ″ has a negative value. Therefore, by decreasing the lower stepped DN, since the lower end step DN "is also reduced in the rotary head VR _E · VL _E and the voice-only rotary head AR · AL, a negative value greater of the calculated values is further absolute value Then you have
As a result, the value of B further deviates from the standard value, so that the value of the lower step DN cannot be made smaller than 52.5 μm. As a result, the condition DN ≧ 52.5 is obtained.

Furthermore, a PAL SECAM having the head arrangement shown in FIG.
In the case of the HiFi VTR for use, in the recording track pattern of the SP mode shown in FIG. 8A, A ₁ = 14.16 μm. According to the standard described in Table ₁ , A ₁ ≧ 8 μm, so that A ₁ has a margin of 6.16 μm with respect to the standard value.
That is, it is possible to 6.16μm reduce the value of A _1. That is, in the above equation of A ₁ = TW / 2−DN + θ / 360 × 2TP, if a value other than the lower end step DN (41.5 μm from FIG. 7B) is similarly set, the lower end step DN becomes 6.16 μm. It means expanding. Therefore, the condition of DN ≦ 41.5 + 6.16 = 47.66 μm is obtained.

Next, in the recording track pattern in the LP mode shown in FIG. 8 (a), A ₁ = 17.583 μm and A ₂ = 6.916 μm. According to the standard, either one of the A ₁ · A ₂ is 1μ
m or more, and either one is 13 μm or more, so A ₁ ≧ 1
And the case of A ₂ ≧ 1 can be considered. A ₁ =
In the above equation of TW ′ / 2−DN ′ + (θ + 180) / 360 × 2TP ′, to satisfy A ₁ ≧ 1 μm, A ₁ must be 16.5
Since the diameter can be reduced by 83 μm (= 17.583-1), the above DN ′ (35.5 μm from FIG. 7B) can be enlarged by 16.853 μm.
In order to satisfy A ₂ ≧ 1 μm, A ₁ is set to 5.916 μm (=
6.916-1) Since DN 'can be enlarged, the above DN' can be reduced by 5.916 μm. Therefore, 35.5 + 16.583 ≧ DN ′ ≧ 35.5−5.916,
That is, the condition of 52.083 ≧ DN ′ ≧ 29.583 is obtained.

In each method and each mode, the lower end step DN 'in a rotary head VR _S · VL _S and lower stepped DN and rotary head VR _E · VL _E and voice-only rotary head AR · AL in a voice-only rotary head AR · AL On the other hand, Table 2 summarizes the above conditions and conditions required by the standards.

From the viewpoint of compatibility between the respective systems, particularly from the viewpoint of compatibility with recording / reproducing of a soft tape, the SP mode must first satisfy all the standards. Then, from the conditions in the SP mode shown in Table 2, the condition of 47.66 μm ≧ DN ≧ 43.46 μm is obtained. As shown in FIG. 1 (b),
Since DN 'is set to be smaller than 6 μm than DN, 41.66 ≧ DN ′ ≧ 37.47 μm... The condition satisfies the condition of DN 'in the LP mode in Table 2. Further, according to the EP mode conditions shown in Table 2, the larger the DN, the better. Therefore, it is concluded from the conditions that DN = 47.66 μm, which is the maximum value of DN, is the optimum value. However, there remains a problem that the standard is out of the standard in the NTSC type EP mode.

Mounting height of the lower end of the voice-only rotary head AR · AL is, the address is to 47.5μm higher than the mounting height of the lower end of the rotary head VR _S · VL _S is due to the above reasons (although the sub μm or less Is set in steps of 0.5 μm).

FIG. 2A shows a recording track pattern on a magnetic tape when recording is performed by switching the signal processing of the HiFi VTR having the above configuration to the NTSC system. Recording track
T _RS · T _LS is formed by a rotary head VR _S · VL _S in SP mode, the recording track T _RE · T _LE are those formed by the rotary head VR _E · VL _E in EP mode.
In addition, the recording track T _AR / T _AL is a rotary head AR / AL dedicated to audio.
It is formed by. The recording track pattern in SP mode is as follows: TW / 2 = 23 μm, TP = 58 μm,
It can be obtained by substituting and calculating DN = 47.5 μm, θ = 120 °, ATW = 28 μm. Further, the recording track pattern in the EP mode can be expressed as follows: TP ″ = 19.3 μm, DN ″ = 41.5 μm
m, θ = 120 °. According to the recording track pattern in the SP mode, A ₁ = 14.16 μm, which satisfies the standard of A ₁ ≧ 10. For conventional NTSC
Regarding the compatibility with HiFi VTR, there is a 5 μm incompatibility when compared with A ₁ = 9.16 μm in the SP mode in FIG. 6A, but this is 1.4 ms in time and is not a problem. Level. According to the recording track pattern in the EP mode in FIG. 2A, B = 9.27 μm.
It greatly deviates from the standard of ≧ 16 μm. Therefore,
This HiFi VTR is not suitable for HiFi recording in the NTSC EP mode. However, regarding compatibility with the conventional HiFi VTR for NTSC, B = B in the EP mode shown in FIG.
Compared with 14,27 μm, the compatibility shift is 5 μm (4.3 ms). Therefore, it is a level at which a soft tape recorded in the EP mode of the conventional HiFi VTR for NTSC can be reproduced. This is because the head width of the AR / AL rotary head for voice only is 28
μm, EP mode track pitch 19.3
It depends on being larger than μm.

Next, the signal processing of the HiFi VTR having the above configuration is performed by PAL
FIG. 2B shows a recording track pattern on the magnetic tape when recording is performed by switching to the SECAM method.
The recording track T _RS / T _LS is the rotating head VR in SP mode.
Formed by the _S · VL _S, the recording track T _RL · T _LL are those formed by the rotary head VR _E · VL _E in EP mode. The recording tracks T _AR and T _AL are formed by the audio-only rotary heads AR and AL. The recording track pattern in SP mode is as follows: TW / 2 = 23 μm, TP
= 49 µm, DN = 47.5 µm, θ = 120 °, and ATW = 28 µm, and are obtained by calculation. In this recording track pattern, A ₁ = 81.6 μm and A ₁ ≧ 8 μm
It satisfies the standard. Conventional HiFiVT for PAL / SECAM
As for the compatibility with R, there is a 6 μm incompatibility compared with A ₁ = 14.16 μm in the SP mode in FIG. 8 (a), but this is 2.5 ms in time and causes no problem. A level. According to the recording track pattern of the LP mode in FIG. 2B, A ₁ = 11.583 μm and A ₂ = 12.9
16 μm, which satisfies the specifications of A ₁ (A ₂ ) ≧ 1 μm and A ₂ (A ₁ ) ≧ 13 μm. Conventional HiFi VTR for PAL / SECAM
And the compatibility of has a compatibility deviation of 6μm Compared with A ₁ = 17,583μm in LP mode Figure 8 (a). In the case of the LP mode, the compatibility deviation of 6 μm is about 4.9 ms in time, which is a slightly large level.

As described above, the HiFi VTR according to the present embodiment can perform recording and reproduction with good compatibility with each system in the SP mode. In addition, compatible playback can be performed in the EP mode of the NTSC system. Furthermore, in the PAL / SECAM LP mode, recording and reproduction with good compatibility can be performed.

Embodiment 2 Another embodiment of the present invention will be described with reference to FIG.
It is as follows. For convenience of explanation, members having the same functions as the members shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

HiFiVTR as another magnetic recording / reproducing device according to the present invention
As shown in FIG. 3, the HiFi system disclosed in [Embodiment 1]
The head configuration of the VTR includes a head VR-E / VL-E dedicated to recording and reproduction in the EP mode of the NTSC system. It should be noted that also in the present embodiment, similarly to the above, the audio-only rotary head AR / AL performs recording and reproduction in the normal mode, and does not operate in the special mode. In addition, rotating head VR
_{S · VL S · VR E ·} VL E is intended to operate at the time of special playback.

Reproducing only head VR-E, as shown in FIG. 3 (a), it is provided in the mounting phase angle θ _{E (deg)} with respect to the rotary head VR _E · VL _S. Similarly, reproducing-only head VL-E are provided in the mounting phase angle theta _E relative to the rotating head VR _S · VL _E. Recording and playback head VR-E
The azimuth angles of the head gaps of the VL-E are set to positive and negative, and their head widths are both 19 μm as shown in FIG. 3 (b). This value is substantially equal to the track pitch in the NTSC type EP mode, whereby the best recording / reproduction efficiency and crosstalk elimination characteristics can be obtained in the NTSC type EP mode. This means that, for example, the reproduction signal output from the target track can be maximized and the crosstalk from the adjacent track can be suppressed, and the best image quality can be obtained. Also, a recording / reproducing head VR-E / VE-E
Mounting height h _E (μm) is the same, B = TP ″ − | D
N ″ −θ / 360 × 2TP ″ −2TP ″ |
Satisfies the standard of B ≧ 16μm, and conventional HiFiVTR for NTSC
Also it is determined on the basis of a DN "and theta = theta _E to good compatibility with.

〔The invention's effect〕

The magnetic recording and reproducing apparatus according to the first aspect of the present invention records and reproduces a video signal in the standard recording mode as described above, and has two channels of azimuth angles of the head gap set to positive and negative, respectively. The recording / reproducing of a video signal is performed in the long-time recording mode with the first group rotary head, the head width is set to be approximately equal to the recording track width in the long-time recording mode of the PAL / SECAM system, and the azimuth angle of the head gap is each positive. A first group rotary head of two channels set to be negative and a third group of heads of two channels where the azimuth angle of the head gap is set to be positive and negative, respectively. Group rotation head, head width AHW of the third group rotation head
(Μm), step DN (μm) at the lower end from the first group rotary head,
And the phase angle of attachment to the first and second group rotary heads is θ (deg), and the dimension from the video recording track center in the standard recording mode, that is, the center of the video head tracing the center to the lower end of the first group rotary head. TW / 2
(Μm), track pitch is TP (μm), PAL / SEC
The length from the center of the video recording track in the long recording mode of the AM system, that is, the center of the video head tracing this to the lower end of the second group rotary head is TW '/ 2.
(Μm), the step at the lower end of the third group rotary head of the second group rotary head is DN ′ (μm), the track pitch is TP ′ (μm),
When the track width of the FM audio signal is ATW '(μm),
First, it is set so that 10 ≦ TW / 2−DN + θ / 360 × 2TP ≦ 29 10 ≦ AHW− {TW / 2−DN + θ / 360 × 2TP} ≦ 29, and then 1 ≦ | TW ′ / 2− DN '+ (θ + 180) / 360 × 2TP' | 13 ≦ ATW '-｛TW' / 2-DN '+ (θ + 180) / 360 × 2T
The configuration is such that P '｝ ATW' ≧ 14.

Therefore, in each of the standard recording mode of the NTSC system, the standard recording mode of the PAL / SECAM system, and the long-time recording mode, the VHS-FM audio signal recording system satisfies the unified standard, and recording / playback compatibility is not lost. Information can be recorded and played back in Hi-Fi. In addition, in the long-time recording mode of the NTSC system, there is an effect that reproduction compatibility can be maintained.

In the magnetic recording / reproducing apparatus according to the second aspect of the present invention, as described above, the head width is set substantially equal to the recording track width in the long-term recording mode of the NTSC system, and is exclusively used in the long-term recording mode of the NTSC system. It further comprises a two-channel fourth-group rotary head for recording and reproducing video signals and having a head gap azimuth angle set to positive and negative, respectively. When the lower step of the third-group rotary head is DN ″ (μm) and the track pitch is TP ″ (μm), 16 ≦ TP ″ − | DN ″ −θ / 360 × 2TP ″ −2TP ″ | It is a configuration to do.

Therefore, in the standard recording mode and the long-time recording mode of each of the NTSC, PAL, and SECAM systems, information must be fulfilled so as to satisfy the unified standard of the VHS-FM audio signal recording system and not to lose recording / playback compatibility. High fidelity recording and playback is possible. In addition, by providing the fourth group rotating head,
In the long-time recording mode of the NTSC system, the recording / reproducing efficiency and the characteristics of eliminating crosstalk from adjacent tracks are improved, so that the effect of improving image quality can be achieved.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1A is a schematic explanatory view showing the mounting phase angle of each rotary head. FIG. 1B is a schematic explanatory view showing the head width and the mounting height of each rotary head. FIG. 2A is a schematic explanatory diagram showing a recording track pattern in the normal mode of the NTSC system. FIG. 2B is a schematic explanatory view showing a recording track pattern in the normal mode of the PAL / SECAM system. FIGS. 3 (a) and 3 (b) show another embodiment of the present invention. FIG. 3A is a schematic explanatory view showing the mounting phase angle of each rotary head. FIG. 3B is a schematic explanatory view showing the head width and the mounting height of each rotary head. 4 to 8 show a conventional example. FIGS. 4A to 4C are schematic explanatory diagrams showing recording track patterns of the VHS-FM audio signal recording method. FIG. 5A is a schematic explanatory view showing the mounting phase angle of each rotary head. FIG. 5B is a schematic explanatory view showing the head width and the mounting height of each rotary head. FIG. 6A is a schematic explanatory view showing a recording track pattern in the normal mode of the NTSC system. FIG. 6B is a schematic explanatory view showing a recording track pattern in the normal mode of the PAL / SECAM system. FIG. 7A is a schematic explanatory view showing the mounting phase angle of each rotary head. FIG. 7B is a schematic explanatory view showing the head width and the mounting height of each rotary head. FIG. 8A is a schematic explanatory view showing a recording track pattern in the normal mode of the NTSC system. FIG. 8B is a schematic explanatory view showing a recording track pattern in the normal mode of the PAL / SECAM system. 1 - 2 rotating drum, VR _{S-VL S} rotary head (first group rotary head), VR _E · VL _E is rotating head (second group rotating head), AR-AL is voice-only rotary head (3 Group rotary head), VR-E / VL-E are rotary heads dedicated to recording / reproduction (fourth
Group rotating head).

Claims (2)

(57) [Claims] An image signal is recorded and reproduced in a standard recording mode, and a first group rotary head of two channels in which an azimuth angle of a head gap is set to positive and negative, respectively, and a video signal in a long time recording mode. Perform recording and playback,
A two-channel second group rotary head in which the head width is set substantially equal to the recording track width in the long-time recording mode of the PAL / SECAM system, and the azimuth angle of the head gap is set to positive and negative, respectively; And a two-channel third group rotating head in which the azimuth angle of the head gap is set to positive and negative, respectively, and a head width AHW (μm) of the third group rotating head is provided. The lower end step DN (μm) with respect to the first group rotary head, the mounting phase angle to the first group / second group rotary head θ (deg), the video recording track center in the standard recording mode, ie, the video head for tracing this TW / 2 (μm) from the center of the first group to the lower end of the first group rotary head and TP (μm) the track pitch The dimension from the center of the video recording track, that is, the center of the video head for tracing this to the lower end of the second group rotary head is TW '/ 2 (μm), and the lower step between the second group rotary head and the third group rotary head is DN. '(Μm), the track pitch is TP' (μm), and the track width of the FM audio signal is
When ATW '(μm) is set, first, 10 ≦ TW / 2−DN + θ / 360 × 2TP ≦ 29 10 ≦ AHW− {TW / 2−DN + θ / 360 × 2TP} ≦ 29, then set 1 ≦ | TW ′ / 2−DN ′ + (θ + 180) / 360 × 2TP ′ | 13 ≦ ATW ′ − ｛TW ′ / 2−DN ′ + (θ + 180) / 360 × 2T
A magnetic recording / reproducing apparatus, wherein P '｝ ATW' ≧ 14 is set. The head width is set substantially equal to the recording track width in the NTSC long time recording mode, the video signal is recorded / reproduced exclusively in the NTSC long time recording mode, and the azimuth angle of the head gap is set to each. A fourth group rotary head of two channels set to positive and negative is further provided, and a lower end step between the fourth group rotary head and the third group rotary head in the long-time recording mode of the NTSC system is DN ″ (μm). 2. The magnetic recording according to claim 1, wherein when the pitch is TP "(μm), 16≤TP"-| DN "-θ / 360 × 2TP" -2TP "| Playback device.