JP2580797B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly, to an FM audio signal deep recording method for recording an audio signal in a deep portion of a video signal track, and an audio signal. The present invention relates to a magnetic recording / reproducing apparatus for selectively performing a separate recording method in which a signal and a video signal are respectively recorded on different tracks.

[Prior Art] At present, as a helical scan type magnetic recording / reproducing apparatus using a 1 / 2-inch wide magnetic tape, a magnetic recording / reproducing apparatus such as a VHS system or an S-VHS system (both are registered trademarks).
A playback device (hereinafter, referred to as a VTR) is generally known.

In these current VTRs, video heads having ± 6 ° gaps having different azimuth angles at opposing positions on the rotating surface of a rotating drum (rotating body), and the video head having the same azimuth angle differing from each other. And audio heads with a gap of azimuth angle ± 30 ° different from each other are attached with a predetermined angle between them,
Input audio signal is set to the frequency modulated audio signal by frequency modulation, the the frequency-modulated audio signal, alternately by different audio head of the azimuth angle, audio tracks T _A1 as a track pattern shown in FIG. 16 ′,
_.. , T _A2 ′, T _A3 ′,... Are sequentially recorded in the deep portion of the magnetic layer of the magnetic tape T, and the luminance signal of the luminance signal and the carrier color signal separated from the input color video signal is frequency-modulated and received. A frequency-modulated luminance signal, a carrier chrominance signal is converted into a low-frequency-converted carrier chrominance signal, and then frequency-division multiplexed with the frequency-modulated luminance signal. As shown in the track pattern of FIG. 16, following the above audio track, a fixed track pitch is formed as video tracks T _V1 ′, T _V2 ′, T _V3 ′... Without forming a guard band between adjacent tracks on the same audio track. At P ', the information is sequentially recorded on the upper layer of the magnetic layer of the magnetic tape T, and is reproduced.

That is, the so-called low-frequency conversion color recording / reproducing method, the FM audio signal deep recording / reproducing method, and the guard bandless recording method of the above-mentioned video track are employed for improving the tape use efficiency.

Also, a required guard band may be formed between the video tracks Tv 'as required, as in the track pattern shown in FIG.

In addition, by the FM audio signal deep recording / reproducing method, the relative linear velocity with respect to the magnetic head is increased by the rotating audio head and the audio signal is recorded, so that the upper end of the magnetic tape T in FIGS. 16 and 17 is recorded. It is possible to obtain high-quality sound as compared with an audio signal recorded by an audio head fixed to two linear audio tracks L1 and L2 formed along the longitudinal direction of the tape.

At the lower end of the magnetic tape T shown in FIGS. 16 and 17, a control track Tc for recording a control pulse of a constant period (for example, one frame) is formed along the longitudinal direction of the tape.

By the way, in recent years, a camera-integrated VTR that integrates a video camera and a VTR has emerged, and together with its small size, light weight, and low price, it has been possible to edit recorded magnetic tapes taken with this camera-integrated VTR. Has been widely enjoyed. At the same time, VTRs for editing recorded magnetic tapes have become widespread.

When editing the recorded magnetic tape, you can add your favorite music or narration to the recorded magnetic tape.
It has been practiced to insert sound such as sound with video. That is, only the audio signal is recorded later on the magnetic tape on which only the video signal is recorded, or only a part of the audio signal on the magnetic tape on which the video signal and the audio signal are recorded is replaced with another audio signal later. The so-called after-recording (hereinafter referred to as after-recording) editing of the audio signal is performed.

In editing the recorded magnetic tape, insert editing of a video signal is performed in which only a video signal is inserted without changing the audio signal of the recorded magnetic tape on which the video signal and the audio signal are recorded.

Such afreo editing of an audio signal and insert editing of a video signal are essential functions that are always performed in a commercial VTR.

[Problems to be Solved by the Invention] However, the above-mentioned low-frequency conversion color recording / reproducing method and
In the VTR of the FM audio signal deep recording / reproducing method, the audio signal is recorded in the deep part before the video track, so after editing the recorded magnetic tape, the audio signal is dubbed and edited. Editing work such as insert editing of a video signal, or the like, has a problem from the aspect of an editing function.

In addition to the above-mentioned FM audio signal deep recording / reproducing method,
The audio signal is frequency-multiplexed with the video signal and recorded together with the video signal on the video track, and the FM audio signal frequency multiplexing recording / playback method that reproduces this also performs editing such as dubbing and insert in the same way as above Can not do.

Further, as described above, by alternately recording with a video head having an azimuth angle of ± 6 ° and making the azimuth angles different between adjacent video tracks, crosstalk between adjacent video tracks can be suppressed and azimuth angle can be suppressed. ± 30 degrees significantly different from video heads with an angle of ± 6 °
The audio signal is recorded in the deep part of the video track by an audio head with an azimuth angle of °, so that crosstalk due to mutual interference between the video signal and the audio signal is suppressed, but these crosstalk can be completely prevented However, there is a possibility that the image quality may be deteriorated.

By the way, in recent years, the above-mentioned S-VHS system V, which has significantly improved the image quality by recording by greatly increasing the carrier frequency,
With the advent of the TR, the S-VHS VTR has been actively used not only for consumer use but also for some business use.

The editing function is also a very important requirement for a commercial VTR. However, as described above, the current VTR such as the S-VHS VTR cannot cope with this, and the S-VHS VT
In R, image quality degradation due to the above-mentioned crosstalk, which was not so noticeable in the VHS system VTR, became noticeable, and further improvement in image quality was demanded.

As described above, with the advent of the S-VHS system VTR, higher image quality has been achieved, and further improvement in image quality has been demanded. Since post-record editing of the audio signal cannot be performed, only post-record editing audio by the audio signal recorded on the linear audio track formed along the longitudinal direction of the magnetic tape can be obtained, and high-quality audio cannot be obtained. Therefore, there has been a demand for a high-quality after-recording audio that matches a high-quality video.

Therefore, an object of the present invention is to provide a VTR that solves these problems.

[Means for Solving the Problems] A first aspect of the present invention is a first magnetic head pair having gaps with different azimuth angles respectively attached to opposing positions on a rotating surface of a rotating body, and the rotating body. Different azimuth angles respectively mounted at opposite positions on the rotating surface of the first magnetic head pair and different height positions and azimuth angles of the first magnetic head pair and the rotary body in the direction of the rotation axis. And a second magnetic head pair having a gap of the following length. The magnetic tape is caused to run at a standard tape speed, and the first magnetic head pair is placed on a second track recorded by the second magnetic head pair. A first recording / reproducing method in which the first track is superimposedly recorded or reproduced.
The first mode and the second track are recorded alternately close to each other via a guard band by running the magnetic tape at a tape speed higher than the standard tape speed, and the second track is reproduced. 2. A magnetic recording / reproducing apparatus for selectively performing the recording / reproducing mode of No. 2 wherein the track width of the first track is tv, the track width of the second track is ta,
The second position based on the height position of the lower end of the first magnetic head pair
The height position of the lower end of the pair of magnetic heads is Ha, and the preceding mounting relative angle of the second pair of magnetic heads in the head rotation direction with respect to the mounting position of the first pair of magnetic heads on the rotating body is θa.
(°), when the track pitch of the track in the first recording / reproducing mode is P ′ and the track pitch of the track in the second recording / reproducing mode is P, the first magnetic head pair and the second In the first recording / reproducing mode, the arrangement of the magnetic head pair is In the second recording / reproducing mode, , Provided that P′−tv> 0.

In a second aspect of the present invention, the first magnetic head pair is a video head pair for recording or reproducing a video, the first track is a video track dedicated to video, and the second magnetic head is The pair is an audio head pair for recording or reproducing audio, the second track is an audio track exclusively for audio, and the minimum audio track required for recording or reproducing high-quality audio signals. The track width of t
amin The magnetic recording / reproducing apparatus according to the first aspect of the present invention is set so as to be set as follows.

[Operation] In the magnetic recording / reproducing apparatus having the above-described configuration, the first recording / reproducing mode of the FM audio signal deep recording / reproducing method (the standard mode VHS method or the S-VHS method) is performed by common heads.
VTR) and a second recording / reproducing mode of a separate recording system for separately recording a video track and an audio track, and in the second recording / reproducing mode, a video track is used. And audio tracks are formed on separate tracks, so that editing such as post-recording of only audio signals or insertion of only video signals can be performed independently, and crosstalk occurs between adjacent tracks and from the audio tracks. There is no, and it can be used as a VTR that can be fully used as a business VTR.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS.

In the following embodiment, an example of the first recording / reproducing mode is described in the VHS system or the S-VHS system.
Of course, the method can be applied to the above method.

FIG. 1 is a block diagram showing a recording system of a recording / reproducing apparatus for realizing a VTR apparatus according to an embodiment of the present invention.

In the figure, 1 is a composite color video signal input terminal, 1 _Y · 1c
Is a luminance signal / color signal separate input terminal. The switch 2 is connected to the terminal A when the composite color video signal is selected, and the terminal B when the luminance signal / color signal separate input is selected.

For example, when connected to the terminal A, the incoming composite color video signal is supplied to the luminance comb filter (Y-comb) 3, where it is converted into a luminance signal component, and then interlocked with the switch 2. A low-pass filter (LPF) 5a having a cut-off frequency of about 3 MHz and a low-pass filter (LP) having a cut-off frequency of about 5 MHz
F) The signal is supplied to 5b, where unnecessary signal components are removed.

When selecting a separate signal, the above switches 2 and 4
Is switched to the terminal b side, and the incoming luminance signal is directly
It is supplied to both the LPFs 5a and 5b.

High-frequency components of the luminance signals from the LPFs 5a and 5b are emphasized by predetermined pre-emphasis circuits 6a and 6b, respectively, and supplied to frequency modulators (FM modulators) 7a and 7b. This FM modulator 7a
Frequency modulation of 3.4 MHz to 4.4 MHz is performed to generate a frequency modulated luminance signal (FM luminance signal) of the VHS system (standard image quality mode), while the frequency deviation of 5.4 MHz to A 7.0 MHz frequency modulation is performed to generate an S-VHS (high image quality mode) FM luminance signal, which is supplied to an adder 10 via a switch 8 which is appropriately switched according to a video recording mode selection signal from a terminal 9. Is done.

The incoming composite color video signal is a bandpass filter with a center frequency of 3.58 MHz and a color comb filter (BPF).
& C.com) 11, where it is converted to a color signal component,
It is supplied to a recording chroma processing circuit 13 via a switch 12 which switches in conjunction with the switch 2, where the phase is shifted by 90 ° every 1H and the low-frequency converted carrier color signal is frequency-converted to a low frequency (629 KHz). Is supplied to the adder 10.

When the separate signal is selected, the switch 12 is also switched to the terminal B in conjunction with the switch 2, and the incoming color signal is directly supplied to the recording chroma processing circuit 13.

The adder 10 converts the signal into a frequency division multiplexed signal. The output signal is supplied to the recording amplifier 14 and amplified, and then supplied to the video heads V1 and V2, where the signal is recorded on the magnetic tape T.

On the other hand, reference numeral 15 denotes an audio signal input terminal. The incoming audio signal is supplied to an FM modulator 16, where it is frequency-modulated to a frequency-modulated audio signal (FM audio signal) and then a band-pass filter (BPF). At 17a, only a predetermined frequency band is passed and supplied to the switch 21, and the incoming audio signal is supplied to the A / D converter 18, where it is converted into a digital signal, and the digital signal processing circuit 19 After a predetermined pulse code modulation (PCM) signal processing is performed in the OQDPSK, a well-known OQDPSK in an offset four-phase differential PSK (OQDPSK) modulator 20 is used.
Modulation is performed, and only a predetermined frequency band is passed by a band-pass filter (BPF) 17b and supplied to the switch 21.
The switch 21 is appropriately switched according to the audio recording mode selection signal from the terminal 22, and the output signal is supplied to the recording amplifier 23, amplified and supplied to the audio heads A1 and A2, and the signal is supplied to the magnetic tape T. Be recorded.

FIG. 2 is a block diagram showing a reproducing system of a recording / reproducing apparatus for realizing a VTR apparatus according to one embodiment of the present invention.

In the figure, a frequency division multiplexed signal of an FM luminance signal and a low-frequency conversion carrier chrominance signal recorded on a magnetic tape T is alternately reproduced by video heads V1 and V2, and preamplifiers 24 ₁ and 24 ₂
Is supplied to a switch 25 which is switched by a head switching pulse having a two-field period from a terminal 26 through a terminal 26, and is converted into a continuous signal.
F) 27 and a low-pass filter (LPF) 28. HPF27
The reproduced FM luminance signal separated and filtered by the filter is supplied to a limiter 29, where the amplitude fluctuation component is removed, and then the MF demodulator 30a and the low-pass filter (LPF) 31a of the VHS (standard image quality) reproduction system are removed. And supplied to the switch 33 via a de-emphasis circuit 32a, and via the S-VHS (high image quality mode) reproduction system FM demodulator 30b, a low-pass filter (LPF) 31b and a de-emphasis circuit 32b. Supplied to

The switch 33 is appropriately switched to a mode corresponding to the mode at the time of recording by the video recording mode discrimination signal from the terminal 34.

Further, the reproduction signal supplied to the LPF 28 described above is subjected to a low-frequency conversion carrier color signal after being separated and filtered, and then subjected to a phase transition opposite to the phase transition during recording by the reproduction chroma processing circuit 35, It is restored to the reproduced carrier color signal of the original band. The reproduced carrier color signal is supplied to the color crosstalk removing comb filter 36, where the crosstalk component is removed.

The adder circuit 37 adds and synthesizes the reproduced carrier color signal and a reproduced luminance signal reproduced and demodulated by the reproducing system in the same mode as that at the time of recording extracted from the switch 33, and outputs the resultant signal to the output terminal 38 as a reproduced composite color video signal. Is output.

Also, the reproduced carrier chrominance signal is output to the terminal 40c via a drive amplifier 39c, the reproduced luminance signal is output to the terminal 40 _Y via a drive amplifier 39 _Y.

On the other hand, the audio signal recorded on the magnetic tape T is alternately reproduced by the audio heads A1 and A2, and passed through the preamplifiers 41 ₁ and 41 ₂ to a switch 42 which is switched by a head switching pulse having a two-field cycle from a terminal 43. After being supplied and converted into a continuous signal here, the signal is supplied to a switch 44 which is appropriately switched to a mode corresponding to a recording mode by an audio recording mode discrimination signal from a terminal 45. Here, if the signal is an FM audio signal, the signal is demodulated in an FM demodulator 47 through a band-pass filter (BPF) 46 and
Supplied to 8. In the case of a digital audio signal, the level of the reduced high-frequency component is corrected by the waveform equalizing circuit 49, and then the bandpass filter (BPF) 50, OQ
After being converted to an analog signal in a D / A converter 53 via a DPSK demodulator 51 and a digital signal processing circuit 52, the switch 48
Supplied to The switch 48 is appropriately switched to a mode corresponding to the mode at the time of recording according to the audio recording mode discrimination signal from the terminal 54, similarly to the switch 44, and the reproduced audio signal is output to the output terminal 55.

Next, the head arrangement and the like in the present invention will be described in detail. FIGS. 3 and 4 show one embodiment of the arrangement of each head in the present invention.

As shown in the figure, a first video head V1 and a second video head V2 are mounted at positions 180 ° opposite each other on the rotating surface of a rotating drum (rotating body). Head widths Wv are equal, and their azimuth angles are the same as the current VTR (VHS or S-VHS)
± the same angle as the azimuth angle standardized in
For example, the azimuth angle of the first video head V1 is set to + 6 °, and the azimuth angle of the second video head V2 is set to −6 °.

Further, at a position preceding the first video head V1 in the rotational direction by an angle θa (°),
The second audio head A2 is mounted at a position higher than the lower ends of the video heads V1 and V2 by Ha on the rotation axis direction of the rotary drum. Further, the first audio head A1 is mounted at the same height position as the second audio head A2 and at a position facing 180 °.

Therefore, the first audio head A1 is mounted at a position ahead of the first video head V1 in the rotational direction by θa + 180 °, and the head widths Wa of these audio heads A1 and A2 are equal, and the first audio head A1 has the same head width Wa. The azimuth angle is ± the same angle as the azimuth angle standardized in the current VTR (VHS or S-VHS) FM sound signal deep recording method.
30 °, for example, the first audio head A1
Is selected as + 30 °, and the azimuth angle of the second audio head A2 is selected as −30 °.

As a result, the magnetic tape T becomes the current VTR (V in the standard mode).
When the tape is run at the tape speed (33.35 mm / s) standardized by the HS system or the S-VHS system (hereinafter referred to as the standard tape speed), the magnetic tape T remains on the same magnetic tape T as in FIGS. 16 and 17. The track pattern shown in FIG.

When the magnetic tape T runs at a tape speed higher than the standard tape speed, a track pattern as shown in FIG. 5 is formed on the magnetic tape T. In the figure, linear audio tracks L1 and L2 are formed at the upper end of the magnetic tape T along the longitudinal direction of the tape, and control is performed at a constant period (for example, one frame) along the longitudinal direction of the tape at the lower end of the magnetic tape. The control track Tc on which the pulse is recorded is formed.

T _V1 , T _V2 and T _V3 are video tracks in which a frequency division multiplexed signal obtained by frequency division multiplexing of an FM luminance signal and a low-frequency conversion carrier color signal is recorded at a constant track pitch P for each field. _.. , T _A1 , T _A2 and T _A3 ... _Are audio tracks on which FM audio signals or digital audio signals are recorded for one field each, and are formed to be inclined at a predetermined angle with respect to the longitudinal direction of the tape.

The video track T _V1 is formed by the first video head V1, and the video track T _V2 in the next one field period is formed by the second video head V2 and via the wide guard band G1. Further, the video track T _V3 in the next one field period is similarly formed by the first video head V1.

The audio track T _A1 is the second audio head A2
The prior to the video track T _V1, it is formed adjacent and parallel with respect to the video track T _V1, the audio track T _A2 of the next one field period the first audio head
Also prior to the video track T _V2 by A1, and adjacent and parallel with respect to the video track T _V2 are formed located in the guard band G1, the audio track T _A3 further next one field period the The second audio head A2 is similarly formed.

Further, the required guard band G2 is formed as needed between the video track Tv and audio track T _A.

Here, in consideration of compatibility with the current VTR (VHS method or S-VHS method), the diameter of the rotating drum needs to be the same as the diameter of the rotating drum of the current VTR. In addition, the fifth
To H and recording in forming the track pattern shown in Fig, H shift (H number list) the _{α H α H = (N-} 1/2) H ( where, N is the positive integer, H is 1 For example, if the above N is set to 3 and the H shift α _H = 2.5H, the tape speed becomes approximately 55.37 (mm / s), and in this case, the recording time Is about 74 minutes (when a T-120 tape is used), which is enough recording time for a commercial VCR and a consumer VTR.

Here, first to fourth examples of the relationship between the VTR track pattern and the head for realizing both the current recording mode and the recording mode of FIG. 5 will be described.

<First Embodiment> In the first embodiment, in the current recording mode shown in FIGS. 16 and 17, the audio track T _A ′ has at least the video track T
v ', and in the recording mode of FIG. 5, the video track Tv and the audio track Tv
_{And A} must not overlap at least. The video track width tv and the audio track width ta are the same in the current recording mode and the recording mode of FIG. 5, respectively. The video track width tv matches the video head width Wv, and the audio track width ta is the audio head width. Since it matches the width Wa, the video head and the audio head can be shared for both recording modes, and it is not necessary to increase the number of heads.

FIGS. 6 and 7 show the 16th embodiment of the first embodiment.
17 schematically shows the relationship between the track pattern and the head of the current recording mode of FIG. 17 and the recording mode of FIG.
The horizontal axis represents the angle in the drum rotation direction with respect to one video head, and the vertical axis represents the track size on the magnetic tape (height in the rotation axis direction of the drum). Is denoted by Tv ', and the video track in the recording mode of FIG. 5 is denoted by Tv.

The range enclosed by the thick line in FIGS. 6 and 7 indicates that the audio head can be arranged with respect to the mounting position of one video head satisfying the conditions of the first embodiment (the lower end position of the head is the origin). Range.

In the current recording mode shown in FIGS. 16 and 17, the condition that the audio track T _A ′ does not protrude at least from the video track Tv ′ is as follows.
1, the height position of the lower end of A2 is the first and second video heads V
The first and second audio heads are located above the head running locus (lower end of the video track) at the lower end of 1, V2.
The height positions of the upper ends of A1 and A2 are the first and second video heads V
1, which is below the head running locus (the upper end of the video track) at the upper end of V2.

That is, the first and second audio heads A based on the height positions of the lower ends of the first and second video heads V1 and V2.
1, the height position of the lower end of A2 is defined as Ha, and the leading mounting relative angle of audio head A2 (or A1) in the head rotation direction with respect to the mounting position of one video head V1 (or V2) on the rotating drum. θa, video track Tv ′ of the current recording mode
When the track pitch of P is P ′, Becomes Here, tv is the video track width, and ta is the audio track width.

Conditions for the video track Tv and audio track T _A are not overlapped at least in the recording mode of FIG. 5, the second height position of the lower end of the first and second audio heads A1, A2 are of one field period before each 2 and the head traveling locus at the upper end of the first video heads V2 and V1 (video track Tv
And the height positions of the upper ends of the first and second audio heads A1 and A2 are lower than the lower end of the first and second video heads V1 and V2 (head of the video track Tv). Lower end).

Here, considering the compatibility with the current VTR, the maximum width of the head width Wv of the video heads V1 and V2 is the track pitch P 'of the video track Tv' in the current recording mode. on both sides of the head traveling track of the first and second video heads V1, V2 of the upper and lower ends as a limit capable of forming a sound track T _a to satisfy the above conditions in the embodiment (P'-tv) / 2 of the width It is necessary to save.

The height position (Ha) of the lower ends of the audio heads A1 and A2 based on the height position of the lower ends of the video heads V1 and V2 is the sixth position.
The lower end (13) of the audio track in FIGS.
As shown in the figure, Ha ≧ A + B + C.

here, B = tv, However, since P′−tv> 0, if A, B, and C are substituted into the above condition, Becomes

In addition, the upper end (14) of the audio track shown in FIGS.
Becomes Ha + ta ≦ D−C.

here, However, P'-tv> 0, Therefore, if C and D are substituted into the above conditions, Becomes

Therefore, the conditions in the recording mode of FIG. Becomes Here, P is the track pitch of the video track pattern Tv in the recording mode of FIG.

The audio track T _A has a minimum audio track width t necessary for recording / reproducing a high-quality audio signal.
The condition for securing _amin (current VTR VHS standard is 20 μm for NTSC and 16 μm for PAL) is as follows: Becomes

From the above conditions, the minimum value θ _amin (°) of the preceding mounting relative angle θa (°) of the audio head with respect to the video head.
Can be obtained from the above equations (14) and (16), and θa
The maximum value θ _amax (°) of (°) can be obtained from the above equations (13) and (15). That is, θ _amin is calculated by the above equation (1) assuming that the audio track is below the video track.
Assuming θa = θ _amin in 4) and (16), Calculating this, Becomes

Further, θ _amax is θ θ in the above equations (13) and (15) assuming that the audio track is above the video track.
If a = θ _amax , Calculating this, Becomes

Therefore, θ _amin ≦ θa ≦ θ _amax becomes Becomes

Further, the regulation (condition) on the height position of the upper end of the audio head is based on the head running locus (lower end of the video track) of the lower end of the video head in the recording mode of FIG. (A) value θ _a1 that moves to the head running locus (the upper end of the video track) at the upper end of
(°) can be obtained as the coordinates of θa at the intersection from the above equations (12) and (14). Similarly, the restriction (condition) on the height position of the lower end of the audio head is determined based on the head running locus of the lower end of the video head in the current recording mode and the head at the upper end of the video head in the recording mode of FIG. The value θ _a2 (°) of θ a (°) that moves to the traveling locus can be obtained as the coordinate of θ a at the intersection from the above equations (11) and (13). That is, Becomes

From the above relationship, the preceding mounting relative angle θa (°) of the audio head with respect to one video head, the mounting height position Ha of the lower end of the audio head with reference to the lower end of the video head, and the head width Wa are track The following is obtained according to the magnitude relationship of the pitch P. (A) When P ≧ P ′ + tv, θ _a1 ≦ θ _a2 (see FIG. 6), and W in each magnitude range of θa (°) at this time.
The conditions for a and Ha are as follows. That is, (i) When θ _amin ≦ θa ≦ θ _a1 , from equations (11) and (14), (Ii) For θ _a1 ≦ θa ≦ θ _a2 , from equations (11) and (12), t _amin ≦ Wa ≦ Wv (Iii) When θ _a2 ≦ θa ≦ θ _amax , equations (13) and (12)
From (B) When P ≦ P ′ + tv, θ _a2 ≦ θ _a1 (see FIG. 7), and W in each magnitude range of θa (°) at this time.
The conditions for a and Ha are as follows. That is, (i) When θ _amin ≦ θa ≦ θ _a2 , from equations (11) and (14), (Ii) For θ _a2 ≦ θa ≦ θ _a1 , from equations (13) and (14), t _amin ≦ Wa ≦ P−P ′ (Iii) When θ _a1 ≦ θa ≦ θ _amax , equations (13) and (12)
From In the first embodiment, as shown in FIG.
The video track width tv is set to the track pitch P 'of the current recording mode.
, If tv = P ', then θ _a2 = 180.

(A ′) When P ≧ 2P ′, θ _a1 ≦ θ _a2 (see FIG. 6)
And Wa, Ha in each magnitude range of θa (°) at this time.
Is as follows. That is, (i) When θ _amin ≦ θ _a ≦ θ _a1 , (Ii) When θ _a1 ≦ θa ≦ θ _a2 (= 180), _tamin ≦ Wa ≦ P ′ (= Wv) (Iii) When θ _a2 (= 180) ≦ θa ≦ θ _amax , (B ′) When P ≦ 2P ′, θ _a2 ≦ θ _a1 (see FIG. 7)
And Wa, Ha in each magnitude range of θa (°) at this time.
Is as follows. That is, (i) When θ _amin ≦ θa ≦ θ _a2 (= 180), (Ii) When θ _a2 (= 180) ≦ θa ≦ θ _a1 , _tamin ≦ Wa ≦ P-P ′ (Iii) When θ _a1 ≦ θa ≦ θ _amax , <Second Embodiment> In the second embodiment, the conditions of the first embodiment (that is, the audio track T _A ′ in the current recording mode of FIGS. 16 and 17) are used.
Does not exceed at least the video track Tv ′,
In addition to the video track Tv and audio track T _A are not overlapped at least) in the recording mode of FIG. 5, the current V
In order to ensure compatibility with TR, the condition is that audio track T _A ′ should be arranged as close as possible to the center of video track Tv ′ in the current recording mode of FIGS. 16 and 17. , For that, the video track Tv ′
Is required to ensure a minimum required audio track width in one direction from the center of the audio track T _A ′.
10μm for NTSC system in VHS system of VTR, 8μm for PAL system
Has been standardized).

FIGS. 8 to 10 show the 16th embodiment of the second embodiment.
17 schematically shows the relationship between the track pattern and the head of the current recording mode of FIG. 17 and the recording mode of FIG.
The horizontal axis represents the angle in the drum rotation direction with respect to one video head, and the vertical axis represents the track size on the magnetic tape (height in the rotation axis direction of the drum). Is shown as Tv ', and the video track in the recording mode of FIG. 5 is shown as Tv.

The range enclosed by a thick line in FIGS. 8 to 10 is the position where the audio head can be arranged with respect to the mounting position of one video head (the origin is at the lower end position of the head) which satisfies the conditions of the second embodiment. Range.

In the current recording mode shown in FIGS. 16 and 17, the condition that the audio track T _A ′ does not protrude at least from the video track Tv ′ is determined by the equations (11) and (1) in the first embodiment.
Same as 2). In addition, in the recording mode of FIG. 5, the condition that the video track Tv and the audio track T _A do not overlap at least is determined by the expression (13) in the case of the first embodiment.
Same as (14).

Further, in the current recording mode shown in FIGS. 16 and 17, the condition for arranging the audio track T _A ′ so as to be as close as possible to the center of the video track Tv ′ is as follows.
It is to ensure a minimum required voice track width for recording / reproducing a high-quality audio signals in the one side direction of the 'audio tracks T _A from the center of the' Tv.

To this end, as distributed respectively (minimum sound track width required for recording / reproducing a high-quality audio signals) minimum width t _amin audio track width ta on either side direction of the center of the video track Tv ' Just place them. The conditions for that are: Becomes

Also, from the above conditions, the minimum value θ of the relative angle θa (°) of the preceding mounting of the audio head with respect to the video head.
_amin (°) can be obtained from the above equations (14) and (22), and the maximum value θ _amax (°) of θa (°) can be obtained from the above equation (1).
It can be obtained from 3) and (21). That is, Becomes

Further, the regulation (condition) on the height position of the upper end and the lower end of the audio head is changed according to the recording mode.
The values θ _a1 (°) and θ _a2 (°) of (°) are _{calculated by the} equations (12), (14), (11), and (13), respectively, as in the first embodiment.
From Becomes

From the above relationship, the preceding mounting relative angle θa (°) of the audio head with respect to one video head, the mounting height position Ha of the lower end of the audio head with reference to the lower end of the video head, and the head width Wa are track The following is obtained according to the magnitude relationship of the pitch P. (A) When P ≧ P ′ + tv, θ _a1 ≦ θ _a2 (see FIG. 8), and W in each magnitude range of θa (°) at this time.
The conditions of a and Ha are (i) to (iii) in (a) of the first embodiment.
Is the same as

(B) When P ≦ P ′ + tv, θ _a2 ≦ θ _a1 (see FIG. 9), and W in each magnitude range of θa (°) at this time.
The conditions of a and Ha are (i) to (iii) in (b) of the first embodiment.
Is the same as

In the case of, θ _a2 ≤ θ _amin and θ _amax ≤ θ _a1 (see Fig. 10)
At this time, in the range of θ _amin ≦ θa ≦ θ _amax , from the expressions (13) and (14), the condition of Wa and Ha is defined as t _amin ≦ Wa ≦ P−P ′ Becomes

In the second embodiment, as shown in FIG.
The video track width tv is the track pitch P 'of the current recording mode.
, If tv = P ', then θ _a2 = 180.

(A ′) When P ≧ 2P ′, θ _a1 ≦ θ _a2 (see FIG. 8)
And Wa, Ha in each magnitude range of θa (°) at this time.
Are the same as those in (i) to (iii) of the first embodiment (a ').

(B ′) When P ≦ 2P ′, θ _a2 ≦ θ _a1 (see FIG. 9)
And Wa, Ha in each magnitude range of θa (°) at this time.
Are the same as those of (i) to (iii) of (b ') of the first embodiment.

In the case of, θ _a2 ≤ θ _amin and θ _amax ≤ θ _a1 (see Fig. 10)
At this time, Wa, Ha in the range of θ _amin ≦ θa ≦ θ _amax
The condition is that t _amin ≤ Wa ≤ P-P ' Becomes

<Third Embodiment> The third embodiment is based on the conditions of the first and second embodiments (ie,
The audio track T _A ′ does not protrude at least from the video track Tv ′ in the current recording mode shown in FIGS. 16 and 17, and the video track Tv and the audio track T _A do not overlap at least in the recording mode shown in FIG. , 16th
In the current recording mode of FIG. 17 and FIG. 17, the audio track T _A ′ is arranged so as to be as close as possible to the center of the video track Tv ′, and the audio track T _A ′ is minimized in one side direction of the audio track T _A ′ from the center of the video track Tv ′. In addition to securing the required track width), each VTR
Compatibility ensured between further order to facilitate taking the guard band G2 between the video track Tv and audio track T _A, between the audio tracks T _A is possible video track Tv in the recording mode of Figure 5 are those with the proviso that arranged to be near the center of the wide guard bands G1, Therefore, the minimum to one side direction of the audio track T _a from the center of the wide guard bands G1 between the video track Tv The condition is that a minimum necessary audio track width is secured.

FIG. 11 to FIG. 14 show the 16th embodiment of the third embodiment.
17 schematically shows the relationship between the track pattern and the head of the current recording mode of FIG. 17 and the recording mode of FIG.
The horizontal axis represents the angle in the drum rotation direction with respect to one video head, and the vertical axis represents the track size on the magnetic tape (height in the rotation axis direction of the drum). Is shown as Tv ', and the video track in the recording mode of FIG. 5 is shown as Tv.

Note that the range surrounded by a thick line in FIGS. 11 to 14 is where the audio can be arranged with respect to the mounting position of one video head satisfying the conditions of the third embodiment (the lower end position of the head is the origin). Represents a range.

In the current recording mode shown in FIGS. 16 and 17, the condition that the audio track T _A ′ does not protrude at least from the video track Tv ′ is determined by the equations (11) and (1) in the first embodiment.
Same as 2). In addition, in the recording mode of FIG. 5, the condition that the video track Tv and the audio track T _A do not overlap at least is determined by the expression (13) in the case of the first embodiment.
Same as (14).

Further, in the current recording mode shown in FIGS. 16 and 17, the audio track T _A ′ is arranged so as to be as close as possible to the center of the video track Tv ′, and one side of the audio track T _A ′ from the center of the video track Tv ′. The conditions for ensuring the minimum required track width in the direction are the same as the expressions (21) and (22) in the case of the second embodiment.

Furthermore, in the recording mode of FIG.
Conditions for arranging so that _A is as close as possible to the center of the wide guard band G1 between the video tracks Tv are as follows:
It is to ensure a minimum required voice track width for recording / reproducing the wide high-quality audio signals in the one side direction of the audio track T _A from the center of the card band G1 between the video track Tv. For this purpose, the minimum width t _amin audio track width ta (high-quality minimum sound track width required for recording / reproducing an audio signal) wide between the video track Tv central guard bands G1 What is necessary is just to arrange | position so that it may distribute to each side direction. The conditions for that are: Becomes

In addition, the restrictions (conditions) on the height positions of the upper end and the lower end of the audio head in consideration of the conditions are changed depending on the recording mode. The values of θa (°) θ _a1 (°), θ _a2 (°)
Are obtained from equations (12) and (14) and equations (11) and (13) as in the first embodiment. Becomes

Furthermore, regulation of the height position of the upper and lower ends of the condition be considered audio head (conditions), the value theta _a3 (°) of .theta.a (°) moving the recording mode, theta _a4 (°) is
From equations (14) and (22) and equations (13) and (21), respectively Becomes This corresponds to θ _amin and θ _amax of the second embodiment.

Furthermore, taking into account the conditions, the restrictions (conditions) on the height positions of the upper end and the lower end of the audio head are changed depending on the recording mode. The values of θa (°) θ _a5 (°), θ _a6 (°)
Are given by equations (11), (31) and (12), (32), respectively. Becomes

From the above relationship, the preceding mounting relative angle θa of the audio head with respect to one video head, the mounting height position Ha of the lower end of the audio head with reference to the lower end of the video head, and the head width Wa are larger or smaller than the track pitch P. Depending on the relationship: (A) When P ≧ P ′ + 2tv−t _amin , θ _a1 ≦ θ _a5 ,
θ _a6 ≦ θ _a2 (see FIG. 12). In this case, θ _a5 (= θ
_amin ) ≦ θa ≦ _θa6 (= _θamax ) in the range of equation (11),
From (12), the condition of Wa and Ha is as follows: t _amin ≦ Wa ≦ Wv Becomes

(B) When P ≧ P ′ + tv, θ _a3 ≦ θ _a5 ≦ θ _a1 ≦ θ _a2
≦ θ _a6 ≦ θ _a4 (see FIG. 11), and in this case, θ _a5 = θ
_{Since amin} , _θa6 = _θamax , the conditions of Wa, Ha in each magnitude range of θa (°) at this time are as follows. That is, (i) when θ _a5 (= θ _amin ) ≦ θa ≦ θ _a1 , the equation (1)
From 1) and (14) (Ii) For θ _a1 ≦ θa ≦ θ _a2 , from equations (11) and (12), t _amin ≦ Wa ≦ Wv (Iii) In θ _a2 ≦ θa ≦ θ _a6 (= θ _amax ), equation (1)
3), from (12) (C) When P ≦ P ′ + tv, θ _a5 ≦ θ _a3 , θ _a2 ≦ θ _a1
And θ _a4 ≦ θ _a6 (see FIG. 13), and at this time, θ _a3 =
Since θ _amin and θ _a4 = θ _amax , the conditions of Wa and Ha in each magnitude range of θa at this time are as follows. That is, (i) When θ _a3 (= θ _amin ) ≦ θa ≦ θ _a2 , the expression (1)
From 1) and (14) (Ii) For θ _a2 ≦ θa ≦ θ _a1 , from equations (13) and (14), t _amin ≦ Wa ≦ P−P ′ (Iii) In θ _a1 ≦ θa ≦ θ _a4 (= θ _amax ), equation (1)
3), from (12) θ _a2 ≦ θ _a3 and θ _a4 ≦ θ _a1 (refer to FIG. 14). At this time, in the range of θ _a3 (= θ _amin ) ≦ θa ≦ θ _a4 (= θ _amax ), the expressions (13) and (14) ) To Wa, Ha are: t _amin ≦ Wa ≦ P−P ′ Becomes

In the third embodiment, as shown in FIG.
The video track width tv is set to the track pitch P 'of the current recording mode.
, If tv = P ', then θ _a2 = 180 Becomes

(A ′) When P ≧ 3P′−t _amin , θ _a1 ≦ θ _a5 , θ _a6
≤ _θa2 (see Fig. 12), and at this time, _θa5 (=
θ _amin ) ≦ θa ≦ θ _a6 (= θ _amax )
From 1) and (12), the condition of Wa and Ha is t _amin ≤ Wa ≤ P '(= Wv) Becomes

(B ′) When P ≧ 2P, θ _a3 ≦ θ _a5 ≦ θ _a1 ≦ θ _a2 ≦ θ
_a6 ≦ θ _a4 (see FIG. 11), and the conditions of Wa and Ha in each magnitude range of θa (°) at this time are (a ′) of the first embodiment.
(I) to (iii).

(C ′) When P ≦ 2P ′, θ _a5 ≦ θ _a3 , θ _a2 ≦ θ _a1 ,
θ _a4 ≦ θ _a6 (see FIG. 13), and θa (°) at this time
The conditions of Wa and Ha in each size range are the same as those in (i) to (iii) of (b ') of the first embodiment.

θ _a2 ≦ θ _a3 , θ _a4 ≦ θ _a1 (see FIG. 14), and the conditions of Wa and Ha in each magnitude range of θa (°) at this time are as in the case of (c ′) in the second embodiment. Is the same as

<Fourth Embodiment> The fourth embodiment is based on the conditions of the first to third embodiments (that is,
In the current recording mode of FIGS. 16 and 17, the audio track T _A ′ does not protrude at least from the video track Tv ′, and in the recording mode of FIG. 5, the video track Tv and the audio track T _A do not overlap at least. In the first
In the current recording mode of FIG. 6 and FIG. 17 is arranged such audio track T _A 'is possible video track Tv' at the center near the minimum to one side direction of the 'audio tracks T _A from the center of the' video track Tv To ensure a minimum required track width, and in the recording mode of FIG.
_A is arranged as close as possible to the center of the wide guard band G1 between the video tracks Tv, and the audio track T from the center of the wide guard band G1 between the video tracks Tv.
_(A minimum track width is required in one direction of _A )), and the best compatibility is set with the current VTR for the current recording or the compatibility between the VTRs in the recording mode shown in Fig. 5. Therefore, in the current recording mode, the center of the audio track T _A ′ is arranged so as to coincide with the center of the video track Tv ′, and in the recording mode of FIG. 5, the center of the audio track T _A is located between the video track Tv. Is arranged so as to coincide with the center of the wide guard band G1.

FIG. 15 is a diagram schematically showing the relationship between the track pattern and the head in the current recording mode of FIG. 16 and FIG. 17 and the recording mode of FIG. The vertical axis represents the track size on the magnetic tape (the height of the drum in the direction of the rotation axis) with respect to the video head, and the vertical axis represents the track size on the magnetic tape. The video track of the recording mode of FIG.
Shown as Tv.

The range indicated by the bold line in FIG. 15 indicates the range in which the audio head can be arranged with respect to the mounting position of one video head satisfying the conditions of the fourth embodiment (the lower end position of the head is the origin). ing.

16 and 17, the center of the audio track T _A ′ coincides with the center of the video track Tv ′. Next, by the wide center of the guard band G1 between the center and the video track Tv audio tracks T _A in the recording mode of FIG. 5 are identical, Becomes

From the above equations (41) and (42) Becomes Here, v 'indicates the tape speed in the current recording mode of FIGS. 16 and 17, and v indicates the tape speed in the recording mode of FIG. 5, respectively.

By the way, in the practical range of a normal VTR, when forming an inclined track pattern on a tape, the scanning angle of the head with respect to the tape (that is, the inclination angle of the track formed on the tape) is within 10 ° (usually 2 °). a 6 order °), the H shift (H number list) alpha _H for H and recording in forming the track pattern, 10H (H 1
(Length equivalent to the horizontal scanning period) or less (usually 0.5H to 3.5H)
Therefore, v / v ′ ≒ α _H / α _H ′ can be used. Here, α _H ′ indicates the H shift in the current recording mode of FIGS. 16 and 17, and α _H indicates the H shift in the recording mode of FIG. 5, respectively.

Therefore, Can also be expressed as

The condition in the fourth embodiment, [Equation (41), (4
2)], since ta ≦ tv and ta ≦ P−P ′, the expression (1)
Conditions 1), (12), (13), and (14) always hold.
Furthermore, since ta ≧ t _amin , equations (21), (22), (3
Conditions 1) and (32) are always satisfied.

From the above relationship, the mounting height position Ha and the head width Wa of the lower end of the audio head with respect to the lower end of the video head
Is as follows according to the magnitude relation of the track pitch P. (A) When P ≧ P ′ + tv, t _amin ≦ Wa ≦ Wv Become.

(B) When P≤P '+ tv, _{tamin≤Wa≤PP} -P' Becomes

In particular, when the video track width tv is matched with the track pitch P 'of the current recording mode, tv = P' It is good.

(A ′) When P ≧ 2P ′, _tamin ≦ Wa ≦ P ′ (= Wv) Becomes

(B ′) When P ≦ 2P ′, _tamin ≦ Wa ≦ _PP −P ′ Becomes

As described above, in the first to fourth embodiments, at least the following must be satisfied as a common condition for the arrangement of the video head and the audio head. That is, in the current recording mode of FIGS. 16 and 17, since the video track width tv does not exceed the track pitch P ′, tv ≦ P ′, and the audio track T _A ′ is at least higher than the video track Tv ′. By not protruding, t _amin ≦ ta ≦ tv. However, ta is the audio track width, and t _amin is the minimum audio track width required for recording / reproducing high-quality audio signals (current VTR VHS standardized to 20 μm for NTSC and 16 μm for PAL). ing).

In the recording mode of FIG. 5, the video track Tv
And the audio track T _A at least do not overlap (ie,
The audio track T _A falls within the wide guard band G1 between the video tracks Tv), so that ta ≦ P−tv (where P is the track pitch).
In consideration of compatibility with a VTR in which Tv takes the track pitch P 'of the current recording mode as the maximum track width, the above is ta≤PP'.

Therefore, the arrangement of the video head and the audio head for satisfying the above condition is only required to satisfy the condition in the first embodiment described above. And in the recording mode of FIG. Further, for the minimum audio track width t _amin , It is necessary to be.

A single VTR device having the configuration shown in FIGS. 1 and 2 performs the recording / reproduction by selecting the current recording mode shown in FIGS. 16 and 17, and the recording mode shown in FIG. In the case where recording / reproduction is performed selectively, when recording is performed in each recording mode by the single VTR device, in the current recording mode of FIGS. 16 and 17, the above equations (51) and (52) are calculated. In the recording mode shown in FIG. 5, the above equation (53) is satisfied.
In order to satisfy (54), the video head and the audio head included in the one VTR device are arranged at predetermined positions. Thereby, the separate recording / reproduction of the track pattern as shown in FIG. 5 can be performed while maintaining compatibility with the current VTR and without increasing the number of heads.

[Effects of the Invention] As described above, according to the present invention, in one VTR device, the current VHS system and S-VHS system (first recording / reproducing mode) by using a common video head and audio head configuration. Recording / reproducing, and recording / reproducing of a separate system (second recording / reproducing mode) in which a video track and an audio track are separate tracks can be selectively performed without increasing the number of heads. Can be implemented at low cost.

Therefore, in the recording / reproduction of the current VHS system and the S-VHS system, naturally, other VHS system or S-VHS system
Fully compatible with VTR.

Also, in this separate recording / reproducing,
Since the video track and audio track are formed on separate tracks, insert editing of video signals and post-record editing of audio signals can be performed independently, thereby providing sufficient functions as a professional VTR Can be obtained.

In addition, since a track having a guard band can be formed, crosstalk interference between adjacent tracks does not occur, so that a high-quality signal can be reproduced.Furthermore, since low-frequency components which cannot be reduced by azimuth loss do not interfere, Records and reproduces signals with energy up to low frequencies,
The transmission band of the tape head system can be expanded.

Further, in particular, in the case where the audio signal can be selectively recorded / reproduced into the FM audio signal and the digital audio signal, the audio signal can be recorded / reproduced as a digital audio signal as required, so that deterioration due to dubbing or dubbing can be prevented. Prevent and always edit with high quality audio.

Therefore, even when editing is performed by after-recording or dubbing, high-quality audio that matches high-quality video can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a recording system of an embodiment of a recording / reproducing apparatus for realizing the apparatus of the present invention, FIG. 2 is a block diagram showing the configuration of a reproducing system, and FIGS.
FIG. 5 is a view showing an embodiment of the arrangement relationship of each head in the apparatus of the present invention, FIG. 5 is a view showing an embodiment of a track pattern recorded and formed by the apparatus of the present invention, and FIGS. FIG. 16 is a diagram showing a track pattern relationship for explaining compatibility with a VTR, FIG. 16 is a diagram showing an example of a track pattern according to the current system VTR, and FIG. 17 is a diagram showing another example of a track pattern according to the current system VTR. is there. 1 composite color video signal input terminal, 1 _Y luminance signal input terminal, 1c carrier color signal input terminal, 7a, 7b, 16 frequency modulator, 13 recording chroma processing circuit, 15 Audio signal input terminal, 19,52 ... Digital signal processing circuit, 30a, 3
0b, 47: Frequency demodulator, 35: Reproduction chroma processing circuit, A
1, A2: audio head, Ha: height position of audio head, P, P ': track pitch, T: magnetic tape, _TA1 , _TA2 , _TA3: audio track, _TV1 , T _V2 , T _V3 , Tv,
Tv ': video track, tv: track width of video track, ta: track width of audio track, _tamin: minimum width of audio track, V1, V2: video head, Wa ... head width of audio head , Wv: head width of video head, θa: relative angle of preceding mounting of audio head.

Claims (2)

(57) [Claims] A first pair of magnetic heads having gaps of different azimuth angles respectively mounted at opposing positions on a rotating surface of a rotating body, and a pair of first magnetic heads at opposite positions on a rotating surface of the rotating body. A second magnetic head pair each having a gap with a different azimuth angle attached to the first magnetic head pair and having different height positions and azimuth angles in the rotation axis direction of the rotating body from the first magnetic head pair; The magnetic tape is run at a standard tape speed, and on the second track recorded by the second magnetic head pair,
A first recording / reproducing mode in which a first track is superimposedly recorded or reproduced by the first magnetic head pair, and a magnetic tape is run at a tape speed higher than the standard tape speed. A magnetic recording / reproducing apparatus for recording one track and a second track alternately close to each other via a guard band or selectively performing a second recording / reproducing mode for reproducing the same, The track width of the first track is tv, the track width of the second track is ta, and the height position of the lower end of the second magnetic head pair with respect to the height position of the lower end of the first magnetic head pair is Ha. ,
The preceding mounting relative angle of the second magnetic head pair in the head rotation direction with respect to the mounting position of the first magnetic head pair on the rotating body is θa (°), and the track of the first recording / reproducing mode is When the track pitch is P 'and the track pitch of the track in the second recording / reproducing mode is P, the arrangement of the first magnetic head pair and the second magnetic head pair is as follows.
In the first recording / reproducing mode, In the second recording / reproducing mode, , Provided that P′-tv> 0. 2. The first magnetic head pair is a video head pair for recording or reproducing a video, the first track is a video track dedicated to video, and the second magnetic head pair is an audio track. The second track is an audio track dedicated to audio, and the minimum track width of an audio track required to record or reproduce a high-quality audio signal. _Is t _amin , The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is set so as to be as follows.