JPH03127313A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To obtain a high-quality post-recording voice matched with a high-quality video by selecting the first recording/reproducing mode of the FM audio signal deep layer recording and reproducing system where tracks are recorded by each common head, and the second recording/reproducing mode of the separate recording system where video tracks and audio tracks are recorded separately from each other. CONSTITUTION:The video track width, the audio track width, the height of the lower end of the audio head based on the position of that of the video head, the relative angle of preceding attachment of the audio head in the head rotation direction to the attachment position of the rotating body of one video head, the track pitch of video tracks in the first recording/reproducing mode, the track pitch of video tracks in the second recording/reproducing mode, and the minimum track width of audio tracks required for recording/reproducing of the audio signal of high quality are denoted as tv, ta, Ha, thetaa, P', P, and tamin, respectively. The video head and the audio head are arranged to satisfy formulas I and II in the first recording/reproducing mode and are arranged to satisfy formulas III and IV in the second recording/reproducing mode and are arranged to satisfy formulas V and VI. Thus, the voice of high quality matched with the video is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device, and in particular to an FM audio signal deep recording method in which audio signals are recorded in the deep part of a video signal track, and an audio The present invention relates to a magnetic recording/reproducing device that selectively performs a separate recording method in which signals and video signals are recorded on separate tracks.

[Prior Art] Currently, as a helical scan type magnetic recording/reproducing apparatus using a 1/2 inch wide magnetic tape, there are magnetic recording/reproducing apparatuses such as VH8 system or 5-VH8 system (both registered trademarks). (hereinafter referred to as VTR) is generally known.

In these current VTRs, there are video heads that have a gap of ±6@ at opposite positions on the rotating surface of a rotating drum (rotating body) and have different azimuth angles, and video heads that have different azimuth angles and have a gap of ±6@. and an audio head having a gap of ±30° in azimuth angle, respectively, are installed with a predetermined angular separation, and the input audio signal is frequency-modulated into a frequency-modulated audio signal, and this frequency-modulated audio signal is are alternately tracked by the audio heads having different azimuth angles as shown in the track pattern shown in FIG.
, T', TA3'... are sequentially recorded in the deep part of the magnetic layer of the magnetic tape^I A2 T, and among the luminance signal and carrier color signal separated from the input color video signal, the luminance signal has a frequency After modulating the frequency modulated luminance signal and converting the carrier chrominance signal into a low-pass converted carrier chrominance signal, frequency division multiplexing is performed on the frequency modulated luminance signal, and this frequency division multiplexed signal is transmitted by video heads with different azimuth angles. Alternately, as shown in the track pattern of FIG. 16, following the audio track, video tracks T are placed on the same audio track without forming a guard band between adjacent tracks.
', T ', T, 3... constant! - Rack VI V2 Data is sequentially recorded on the upper layer of the magnetic layer of the magnetic tape T at a pitch P' and then reproduced.

That is, a so-called low frequency conversion color recording and reproducing method, an FM audio signal deep recording and reproducing method, and a guard panless recording method for the video track are adopted to improve tape utilization efficiency.

Further, as in the track pattern shown in FIG. 17, a required guard band may be formed between each video track Tv' as necessary.

In addition, with the FM audio signal deep recording and reproducing method described above, the relative linear velocity of the rotating audio head with the magnetic head is increased and the audio signal is recorded. Two linear audio tracks Ll are formed along the longitudinal direction of the tape.
, it is possible to obtain higher quality audio compared to the audio signal recorded with a fixed audio head in L2.

In addition, a control track TC is formed at the lower end of the magnetic tape in FIGS. 16 and 17 along the longitudinal direction of the tape, in which control pulses of a fixed circumference II (for example, one frame) are recorded.

Incidentally, in recent years, camera-integrated VTRs that combine a video camera and a VTR have appeared, and together with their reduction in size, weight, and price, it has become possible to edit recorded magnetic tapes shot with these camera-integrated VTRs. It has become widely practiced to have fun.

In line with this trend, VTRs for editing recorded magnetic tapes have also become popular.

When editing the recorded magnetic tape mentioned above, audio such as favorite music or narration (dialogue) is added to the recorded magnetic tape along with the video.In other words, a magnetic tape on which only video signals are recorded In this case, only the audio signal is recorded, or only part of the audio signal on a magnetic tape on which the video signal and audio signal are recorded is later replaced with another audio signal, so-called audio signal recording. After-recording (hereinafter referred to as post-recording) FA collection is being conducted.

In addition, when editing the recorded magnetic tape mentioned above,
Video signal insertion fiiJA is performed in which only the video signal is inserted while leaving the audio signal of a recorded magnetic tape on which the video signal and audio signal are recorded.

Such post-recording editing of audio signals and insert editing of video signals are essential functions that are constantly performed in professional VTRs.

[Problem to be solved by the invention] However, the above low frequency conversion color recording and reproducing method and F
In VTRs using the M audio signal deep recording and playback method, the audio signal is recorded in the deep layer before the video track, so when editing the recorded magnetic tape mentioned above, the audio signal must be dubbing edited. However, it is not possible to perform editing operations such as insert editing or insert editing of video signals, and this poses a problem in terms of editing functions.

In addition to the above-mentioned FM audio signal deep recording and reproducing method,
In the case of the M audio signal frequency multiplex recording and playback method, which frequency-multiplexes the audio signal with the video signal, records it together with the video signal on the video track, and plays it back, the TI collection such as dubbing and inserts is recorded in the same way as above. can't do it.

In addition, as mentioned above, by recording alternately using video heads with an azimuth angle of ±6° so that the azimuth angles differ between adjacent video tracks, the azimuth angle can be suppressed and the azimuth angle can be reduced. The angle is ±30 which is significantly different from the video head which has an angle of ±6°.
By recording the audio signal deep into the video track using an audio head with an azimuth angle of °, crosstalk caused by mutual interference between the video signal and audio signal is suppressed, but this crosstalk is completely prevented. However, there was a risk that the image quality would deteriorate.

By the way, in recent years, the appearance of the above-mentioned 5-VH8 system VTR, which has significantly improved image quality by recording with a significantly increased carrier frequency, has occurred. (7) S-V S system VT
R has come to be used not only for consumer use but also for business use in some areas.

Editing functions are also a very important requirement for business VTRs, but as mentioned above,
Current VTRs such as Kinaihakarika, s
−v +−i s method V T Rr ! ;t V H8
The deterioration in image quality due to the above-mentioned crosstalk, which was not so noticeable with conventional VTRs, became noticeable, and there was a demand for further improvement in image quality.

In this way, with the advent of the 5-VH8 system VTR, higher image quality has been achieved, and while there is a desire to improve the image quality of the - layer, on the other hand, when editing audio signals after recording, as mentioned above, FM audio signals are recorded using the deep recording and playback method. Arale of audio signal 21g
Since the audio signal recorded on the linear audio track formed along the longitudinal direction of the magnetic tape cannot be
However, it was not possible to obtain high-quality audio, and there was a desire for high-quality post-recording audio commensurate with the high-quality video.

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

[Means for Solving the Problems] A magnetic recording/reproducing device according to the present invention includes first and second magnetic recording devices each having a gap having a different azimuth angle, which are respectively attached to opposing positions on a rotating surface of a rotating body. The video head and the rotary body are respectively attached at opposite positions on the rotating surface, and the video head and the rotary body are respectively attached at different height positions and azimuth angles in the direction of the rotation axis. A magnetic tape is provided with first and second audio heads having gaps of different azimuth angles, and a magnetic tape is run at a standard tape speed, and an image is recorded by the video head on top of the audio recorded by the audio head. The first recording/playback to record or play back superimposed tracks! A second recording/reproducing mode in which audio tracks and video tracks are alternately arranged adjacent to each other and are recorded or reproduced by running a magnetic tape at a tape speed higher than the standard tape speed mentioned above. A magnetic recording/reproducing device that selectively performs the following, wherein the track width of the video track is tv1, the track width of the audio track is ta, and the height position of the lower end of the audio head with respect to the height position of the lower end of the video head. H
a, θa ('') is the preceding mounting relative angle of the audio head in the direction of head rotation with reference to the mounting position of the first video head on the rotating body, and track pitch of the video track in the first recording/playback mode is P′, when the track pitch of the video track in the second recording/playback mode is P, the arrangement of the video head and the audio head is as in the first recording/playback mode, and the second recording/playback mode is as follows. In addition, when recording/reproducing high-quality audio signals, the track width of the minimum high-quality audio track is set to t.
When amin is set, the settings are as follows.

[Function] In the magnetic recording/reproducing apparatus having the above configuration, the first recording/reproducing mode of the FM audio signal deep recording/reproducing method (standard mode V-S method or 5-VH method) is performed using each common head.
3 system VTR) and the second recording/playback mode of the separate recording system that records the video track and audio track separately, and the second recording/playback mode! l! In some cases, the video track and the audio track are formed on separate tracks. Therefore, editing such as dubbing only the audio signal or inserting only the video signal can be performed independently, and the editing between adjacent tracks and the audio track can be performed independently. Commercial V
It can be used as a VTR that can be used as a TR.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings of FIGS. 1 to 15.

In the following embodiments, the first recording/reproduction mode is explained using the VH3 system or the 5-VH3 system, but it is of course applicable to other VTR systems.

FIG. 1 shows a block system diagram of a recording system of a recording/reproducing apparatus implementing a single VTR, which is an embodiment of the present invention.

In the figure, 1 is a composite color video signal input terminal, 1, 1C
is a luminance signal/chrominance signal separate input terminal, which is connected by switch 2 to the terminal A side when a composite color video signal is selected, and to the terminal port side when a luminance signal/chrominance signal separate input is selected.

For example, when connected to 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 linked to the switch 2. A low-pass filter (LPF) 5 with a cutoff frequency of, for example, about 3MH2 is connected via a switch 4 that is switched by
a and the cutoff frequency are supplied to a low pass filter (LPF) 5b of, for example, about 5M11Z, where unnecessary signal components are removed.

In addition, when selecting separate signals, the above switch 2.4
is switched to the terminal side, and the incoming luminance signal is directly
It is supplied to both the LPFs 5a and 5b.

The brightness signals from the LPFs 5a and 5b have their high frequency components emphasized by predetermined Brien 7793 circuits 6a and 6b, respectively, and are supplied to frequency modulators (CFM modulators) 7a and 7b. In this FM modulator 7a, the frequency deviation is 3.4 MII.
Frequency modulation of Z~4.4M1lZ is performed and Vl-1
s method (standard image quality mode) frequency change 11! i degree signal (FM luminance signal), while the FM modulator 7b has a frequency deviation of 5.4 MIIz to 7. FMII with OMH2 frequency modulation and 5-VH8 system (high image quality mode)
i degree signal, which is sent to the adder 1 via a switch 8 which is switched as appropriate according to a video recording mode selection signal from a terminal 9.
0.

In addition, the composite color video signal station that came in was 3.58M 11
It is also supplied to a bandpass filter and color comb filter (BPF&C comb) 11 with a center frequency of 2, which converts it into a color signal component, and then sends it to a recording chroma processing circuit 13 via a switch 12 that is switched in conjunction with switch 2. Here, the phase is shifted by 90° in increments of 10, and the low frequency (
629KIIZ) into a low frequency converted carrier color signal, which is then supplied to the adder 10.

Incidentally, when selecting Severity 1 to signal, the switch 12 is also switched to the terminal port side in conjunction with the switch 2, and the incoming color signal is directly supplied to the recording chroma processing circuit 13.

The adder F3 converts the signal into a frequency division multiplexed signal, and 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, 15 is an audio signal input terminal, and the incoming audio signal station is supplied to the FM modulator 16, where it is frequency-modulated and converted into a frequency-modulated audio signal (FM audio signal).
Only a predetermined frequency band is passed through a bandpass filter (BPF) 17a and supplied to the switch 21, and an incoming voice signal is supplied to an A/D converter 18, where it is converted into a digital signal. Digital signal processing circuit 1
After predetermined pulse code modulation (PCM) signal processing is performed in step 9, the offset four-phase difference PSK (OQDPS
K) Well-known 0QDPSK modulation is performed in the modulator 20, and only a predetermined frequency band is passed through the bandpass filter (BPF) 17b and supplied to the switch 21. The switch 21 is switched appropriately according to the audio recording mode selection signal from the terminal 22, and the output signal is sent to the recording amplifier 23.
After being supplied to and amplified, the audio head AI,
A2, and the signal is recorded on the magnetic tape T.

FIG. 2 shows a block system diagram of a reproducing system of a recording/reproducing apparatus realizing a VTR apparatus according to an embodiment of the present invention.

In the figure, a frequency division multiplexed signal of an FM luminance signal and a low frequency conversion carrier color signal recorded on a magnetic tape T is alternately reproduced by video heads Vl and V2, and a preamplifier 24. ．． It is supplied to the switch 25 which is switched by the head switching pulse of 2 field periods from the terminal 26 through 242, where it is made into a continuous signal, and then passed through the high-pass filter (PF) 27 and the low-pass filter (LP).
F) 28. Minute 1111i by mouth PF27
The EI-wave reproduced FM luminance signal is supplied to the limiter 29, where the amplitude fluctuation component is removed, and then the VH8 system (
While the 5-V signal is supplied to the switch 33 via the M demodulator 30a, low-pass filter (LPF) 31a, and de-emphasis circuit 32a of the reproduction system of the standard image quality mode)
H3 system (high image quality mode) playback FMI adjuster 30b
.

The signal is supplied to the switch 33 via a low-pass filter (L P F ) 31b and a de-emphasis circuit 32b.

Note that this switch 33 is appropriately switched to a mode corresponding to the mode at the time of recording by a video recording mode determination signal from a terminal 34.

In addition, in the reproducing station supplied to the above-mentioned LPF 28, after the low frequency conversion carrier color signal is separated and filtered, the reproducing chroma processing circuit 35 applies a phase shift opposite to the phase shift during recording. , and are returned to the original band regenerated carrier color signal. This reproduced carrier color signal is supplied to a color crosstalk removal comb filter 3G, where crosstalk components are removed.

The addition circuit 37 uses this reproduced carrier color signal and the switch 33.
The reproduced luminance signal which has been reproduced and demodulated by the reproduction system in the same mode as that at the time of recording is added and synthesized, and the resultant signal is outputted to the output terminal 38 as a reproduced composite color video signal.

The reproduced carrier color signal is outputted to the terminal 400 via the drive amplifier 39c, and the reproduced luminance signal is outputted to the terminal 40.c via the drive amplifier 39c. Output to.

On the other hand, the audio signal recorded on the magnetic tape T is alternately reproduced by audio heads AI and A2, and passed through preamplifiers 411 and 412 to a switch 42 which is switched by a head switching pulse of two field cycles from a terminal 43. After being supplied as a continuous signal, the signal is supplied to a switch 44 which is appropriately switched to a mode corresponding to the recording mode based on an audio recording mode discrimination signal from a terminal 45. If it is an FM audio signal, it is demodulated by an FM demodulator 47 via a bandpass filter (BPF) 4 (i) and supplied to a switch 48. If it is a digital audio signal, it is supplied to a waveform equalization circuit. 4
After the level of the high frequency component whose level has been lowered by .9 is corrected, a bandpass filter (BPF) 50, a 0QDPSK demodulator 51. The signal is converted into an analog signal by a D/A converter 53 via a digital signal processing circuit 52 and then supplied to the switch 48 . Similarly to the switch 44, this switch 48 is appropriately switched to a mode corresponding to the recording mode by an audio recording mode discrimination signal from a terminal 54, and the reproduced audio signal is outputted to an output terminal 55.

Next, to explain in detail the head arrangement etc. in the present invention, FIGS. 3 and 4 show an example of the arrangement etc. of each head in the present invention.

As shown in the figure, a first video head V1 and a second video head V2 are installed at positions facing each other by 180 degrees on the rotating surface of a rotating drum (rotating body), and these video heads V1 and V2 The head l1iBWV of the head is the same, and their azimuth angle is the same as that of the current VTR (VH
For example, the azimuth angle of the first video head (1) is +6°, and the azimuth angle of the second video head (v2) is +6°. The azimuth angle is selected to be -6°.

In addition, the first video head (1) is located at a position that is an angle θa (゛) t ahead of the first video head (1) in the rotational direction, and from the lower end of the first and second video heads (V1, V2) to the rotation axis of the rotary drum. A second audio head A2 is attached at a position higher in the direction by Ha. Further, the first audio head A1 is attached at the same height position as the second audio head A2 and at a position 180 degrees opposite to the second audio head A2.

Therefore, the first audio head A1 is installed at a position θa+180° ahead of the first video head v1 in the rotational direction, and these audio heads AI
, A2 have the same head width Wa, and their azimuth angles are ±30, which is the same angle as the azimuth angle standardized in the FM audio signal deep recording method of current VTRs (VH3 method or S-V day S method). ”, and for example, the azimuth angle of the first audio head A1 is +306
The azimuth angle of the second audio head A2 is -30°
has been selected.

This makes it the same as running the magnetic tape T at the tape speed ff (33, 35 am/s) (hereinafter referred to as standard tape speed) standardized for current VTRs (standard mode VH3 system or 5-VH8 system). magnetic tape T
A track pattern as shown in FIGS. 16 and 17 is formed thereon as in the conventional case.

Further, when the magnetic tape T is run at a tape speed faster 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 along the tape longitudinal direction, and linear audio tracks L1 and L2 are formed along the tape longitudinal direction at the lower end of the magnetic tape at regular intervals (
For example, a control track TC is formed in which control pulses for one frame are recorded.

In addition, T, T, TV3... are images in which a frequency division multiplexed signal in which an FM luminance signal and a low V1 V2 range converted carrier color signal are frequency division multiplexed is recorded for each field with a constant track pitch P. Truck, TAL.

T and TA3... are FM audio signals or digital^2 Audio signals recorded for each field.
- Each rack is formed at a predetermined angle with respect to the longitudinal direction of the tape.

The video track "Vl" is formed by the first video head v1, and is the video track "V1" of the next one field period.
2 is formed by the second video head V2 and via the wide guard band G1. Furthermore, the video track "V3" of the next one field period is the first video head v.
1 is similarly formed.

Also, the audio track T^1 is in the second audio head A.
2, is formed preceding the video track "Vl, adjacent to and in parallel with the video track TV1, and the next 1
Audio during the field period] Rack 'A2 precedes the video track "V2" by the first audio head A1, is adjacent to and parallel to the video track Tv2, and is located in the guard band G1. Furthermore, the audio track TA3 for the next one field period is similarly formed by 2 to the second audio head.

Further, a required guard band G2 is formed between the video track Tv and the audio 1-rack TA as necessary.

Here, the current VTR (V-port S method or S-V port S method)
Considering compatibility with the VTR, the diameter of the rotating drum needs to be the same as that of the current VTR. In addition, in order to record the mouth arrangement when forming the i-rack pattern shown in FIG.
It is necessary to set αH to α)I = (tl -1/2) 1-1 (where N is a positive integer, and the length of the mouth is equivalent to one horizontal scanning period). For example, the above N is set to 3 Assuming that H deviation α = 2.50, tape speed t is approximately 55.3
7 (s+/S), and in this case, the recording time is approximately 7
4 minutes (when using T-120 tape), so commercial V
The recording time is sufficient for TR and consumer VTR.

Here, first to fourth embodiments of the relationship between the VTR track pattern and the head that realize the image recording mode of the current recording mode and the recording mode of FIG. 5 will be described.

〈First Example〉 The first practical example is based on the following conditions: ■ In the current recording mode shown in Figs. 16 and 17, the audio track TA' does not protrude at least from the video track Tv'; In recording B in FIG. 5, the condition is that the video track TV and the audio track T at least do not overlap. Further, the video track width tv and the audio track width ta are the same in the current recording mode and the recording mode shown in FIG. 5, respectively, and the video track width tv is the video head width Wv.
, the audio track width ta matches the audio head width W
Since this corresponds to a, the video head and audio head can be shared in both recording modes, and there is no need to increase the number of heads.

FIGS. 6 and 7 show the 16th example of the first embodiment described above.
This is a diagram schematically showing the relationship between the track pattern and the head in the current recording mode shown in Figures 1 and 17 and the recording mode shown in Figure 5. The ill axis represents the track dimension on the magnetic tape (height in the direction of the rotational axis of the drum), respectively.
The video track in the current recording mode is shown as Tvl, and the video track in the recording mode in FIG. 5 is shown as TV.

In addition, the range surrounded by thick lines in Figures 6 and 7 is the second
This shows the position where the audio can be mounted (the lower end position of the head) with respect to the video head mounting position (with the lower end position of the head as the origin) that satisfies the conditions of the actual flow example.

In the current recording mode shown in FIGS. 16 and 17, the condition (2) for preventing the audio track T' from protruding at least from the video track Tv' is the height position of the lower end of the first and second audio heads AI and A2. is above the head running locus (lower end of the video track) of the lower ends of the first and second video heads V1 and V2, and the height position of the upper ends of the first and second audio heads AI and A2 is at the 1
and a second video head V1. It is located below the head traveling trajectory (the upper end of the video track) at the upper end of V2.

That is, the height positions of the lower ends of the first and second audio heads AI and A2 are set to the height positions of the lower ends of the first and second video heads Vl and V2 as reference a, and the first video head V1 ( Alternatively, the preceding mounting relative angle of audio head A2 (or A1) in the head rotation direction with reference to the mounting position on the rotating drum of V2) is θa.
, when the rack pitch of the video track Tv I in the current recording mode is P'. However, tv is the video track width, and ta is the audio track width.

Condition (2) for the video track Tv and the audio track TA to at least not overlap in the recording mode shown in FIG. is located above the head running locus (the top end of the video track TV) of the upper ends of the second and first video heads V2°vl of the second and first video heads V2°vl, and is located above the head running locus (the upper end of the video track TV) of the first and second audio heads A1. The height position of the upper end of A2 is located below the head traveling trajectory (below the video track Tv) of the lower ends of the first and second video heads V1 and V2, respectively.

Here, considering compatibility with current VTRs, the maximum width of the head width Wv of video heads Vl and V2 is the track pitch P' of video 1 to rack Tv' in the current recording mode. The limit for forming the audio track TA satisfying the above conditions in the recording mode is (P'-tv)/2 on both sides of the head travel locus at the upper and lower ends of the first and second video heads Vl and V2, respectively. It is necessary to keep the width.

Therefore, the conditions for the recording mode shown in FIG. 5 above are...
(13) ...(14) However, P is the track pitch of the video track pattern TV in the recording mode shown in FIG.

The audio track TA records/reproduces high-quality audio signals, and the minimum high-quality audio track width t is 20 μIn for (current VTR + 7) VH 8 system NTsmen C system and 16 μm for PAL system. The conditions for ensuring standardization) are as follows.

From the above conditions, the minimum value θamin 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 the maximum value θ (°) of θa (°) is the above a+ta
x can be determined from equations (13) and (15). That is, it becomes.

Furthermore, the regulations (conditions) regarding the height position of the upper end of the audio head are as follows: The value θa of θa (0) that moves to the head travel trajectory at the top end (top end of the video track)
1 (°) is the intersection θ from the above equations (12) and (14)
It can be obtained as the coordinates of a. Similarly, regulations (conditions) regarding the height position of the bottom edge of the audio head.
The value θ82(
°) can be determined as the coordinate of the intersection θa from the above equations (11) and (13). That is, it becomes.

From the above relationships, the relative angle θa (°) of the preceding mounting of the audio head with respect to the first video head, the mounting of the lower end of the audio head with the lower end of the video head as the reference is the height position low a, the head The width Wa is the track pitch P
Depending on the size relationship, the following will occur. That is, (a) When P≧p' +tv, θ1≦θa2 (6th
(see figure), and the conditions for Wa and Ha in each size range of θa (°) at this time are as follows. That is, (i) θ, ≦θa≦θ, then equation (11), (14
) or (11) θ ≦θa≦θ, 2, then equation (11),
From (12), 1 tamin≦Wa≦WV ( ) θ, 2≦θa ≦08□8, Equation (13).

(12) The formula % (see 7) is obtained, and the conditions for Wa and Ha in each size range of θa (°) at this time are as follows. That is, (1) θ
For amin≦θa≦θa2, equations (11), (14)
% expression % Equation (13).

From (14) ( ii) θ□≦θa At ≦θamax, Formula (13).

(12) In this first embodiment, as shown in FIG. 16, in particular,
The video track width tv is the current record Bl! When matching the track pitch P', if tv-P', then P' θa1=180xP-P.

θ, 2 = 180 becomes.

(a') When P≧2P', θ81≦θa2 (6th
(see figure), and the conditions of Wa9 mouth a in each size range of θa (°) at this time are as follows. That is, (i
) If θanin≦08≦θa1, (ii) θ,≦
When θa≦θa2 (=180), tamin≦Wa≦P
' (-Wvl( ) θa2 (= 180〉 ≦θa ≦θamax, (b') When P≦2P', θ82≦θ, (see Figure 7), and each of θa (°) at this time The conditions for Wa a in the size range are as follows.

That is, (i) θ, ≦θa lln ≦θ, 2 (= 180>), (i) θa2 (= 180) ≦θa ≦θa1, tamain≦Wa ≦P-P' (i) θa1≦θa ≦θamax Now, let's talk about the second embodiment. The second embodiment is based on the conditions of the first embodiment (i.e., the audio track TA' in the current recording mode shown in FIGS. 16 and 17).
(2) that the video track 7v and the audio track TA at least do not overlap in the recording mode shown in FIG. 5);
In order to ensure compatibility with current VTRs, ■ the current recording mode shown in Figures 16 and 17 requires that the audio track T^' be placed as close to the center of the video track TV' as possible. Therefore, the condition is to secure the minimum necessary audio track width in one direction from the center of the video track Tv' to the audio track T' (in the VH3 system of the current VTR, the width is 10μ in the NTSC system). (standardized to 8 μm in the PAL system).

FIGS. 8 to 10 show the first example of the second embodiment described above.
This is a diagram schematically showing the relationship between the track pattern and the head in the current recording mode shown in FIGS. 6 and 17 and the recording mode shown in FIG. The vertical axis represents the track size on the magnetic tape (the height in the direction of the rotation axis of the drum), and the video track in the current recording mode is Tv /, and the video track in the recording mode shown in Figure 5 is TV. show.

Note that the range surrounded by thick lines in FIGS. 8 to 10 indicates the mounting position of the audio head that satisfies the conditions of the second embodiment. It represents the position (lower end position of the head).

In the current recording mode shown in FIGS. 16 and 17, the condition (2) for preventing the audio track T' from protruding at least from the video track T2' is expressed by equation (11) in the case of the first embodiment.
, is the same as (12). Further, in the recording mode shown in FIG. 5, the condition (2) for the video track Tv and the audio track TA to at least not overlap is the same as equations (13) and (14) in the first embodiment.

Furthermore, in the current recording mode shown in FIGS. 16 and 11, the condition (2) for arranging the audio track T' to be as close to the center of the video track Tv' as possible is that the audio track from the center of the video track Tv/ The objective is to secure the minimum necessary audio track width in one direction of TA' for recording/reproducing high-quality audio signals.

For this purpose, the minimum width t・(
The minimum audio track width necessary for recording/reproducing high-quality audio signals may be distributed to both sides of the center of the video track Tv'. The conditions for this are (22).

Also, from the above condition (■), the minimum value θ of the preceding mounting relative angle θa (°) of the audio head with respect to the video head
・(°) is 1ll from the above formulas (14) and (22)
ln can be determined, and the maximum value oallla of θa (°)
X(゛〉) can be obtained from the above equations (13) and (21). That is, it becomes.

Furthermore, the regulations (conditions) regarding the height positions of the upper and lower ends of the audio head are changed by Record@ (θa (
The values θa1('') and θa2('') of
As in the actual flow example, equations (121, (14) and equation (11),
(13).

From the above relationships, the relative angle θa (°) of the previous mounting of the audio head when one video head is taken as the reference, and the mounting of the lower end of the audio head with the lower end of the video head as the reference is the height position 1-1a and the head width. Wa is determined as follows depending on the magnitude relationship of the track pitch P. That is, (a) When P≧p' +tv, θa1≦0a2 (see Figure 8), and the conditions for Wa and mouth a in each size range of θa (°) at this time are the first Example (a) (1)
) to (iii).

(b) When P≦P'+tv, θa2≦θa1 (9th
(see figure), and the conditions for Wa and mouth a in each size range of θa (°) at this time are (i) in (b) of the first embodiment.
It is the same as the case of ~(iii).

tv+t − (c) When P≦P′+ 1, θ82≦
θamin and θamax≦θ81 (see Figure 10), and at this time, in the range of θ・≦θa≦08, 8x, 1
llln From equations (13) and (14), the conditions for Wa and Ha are t
,≦Wa≦P−P′lln.

In this second embodiment, as shown in FIG. 16, in particular,
The video track width tv is the track pitch P of the current recording mode.
', if tv=P', then P'θa1'' 180x P,.

θ, 2 = 180 becomes.

(a') When P≧2P', θa1≦θ, 2 (8th
(see figure), and the conditions for Wa and eye a in each size range of θa (°) at this time are (i) of (a') in the first embodiment.
) to (iii).

(b') When P≦2P', θ82≦081 (9th
(see figure), and the condition of Wa1 mouth a in each size range of θa (°) at this time is (+) of (b') in the first embodiment.
It is the same as the case of ~(iii).

0a2≦θamin and θamax≦θ, 1 (see Figure 10), and in this case, 1ln Wa in the range of θ, ≦θa≦08□8x, and the condition of 1a becomes tannin≦Wa≦P-P'. .

Third Embodiment> The third embodiment is based on the conditions of the first and second embodiments (i.e., in the current recording mode shown in FIGS. 16 and 17, the audio track T^' protrudes from at least the video track Tv'). ■ In the recording mode shown in FIG. 5, the video track l"v and the audio track TA at least do not overlap. ■ In the current recording mode shown in FIGS. 16 and 17, the audio track TA is as close to the video track TV' as possible. In addition to securing the minimum required track width in one direction from the center of the video track Tvj to the audio track T', in the recording mode shown in FIG. In addition to ensuring compatibility between VTRs, the guard band G2 between the video track V and the audio track T^
In order to make it easier to record, the recording mode shown in Figure 5 requires that the audio track TA be placed as close to the center of the wide guard band G1 between the video tracks Tv as possible; , the minimum required audio track width must be secured in one direction of the audio track TA from the center of the wide guard band G1 between the video tracks TV.

11 to 14 are diagrams schematically showing the relationship between the track pattern and the head in the current recording mode shown in FIGS. 16 and 11 and the recording mode shown in FIG. 5 for the third embodiment. , the horizontal axis represents the angle in the direction of rotation of the drum with respect to one video head, and the m-axis represents the track dimension on the magnetic tape (height in the direction of the rotational axis of the drum), respectively.
The video track in the current recording mode is shown as 1"v', and the video!-rack in the recording mode in FIG. 5 is shown as TV.

In addition, the range surrounded by thick lines in Figures 11 to 14 is
It shows the position where the audio can be mounted (lower end position of the head) with respect to the mounting position of the video head (with the lower end position of the head as the origin) which satisfies the conditions of the third embodiment.

In the current recording mode shown in FIGS. 16 and 17, the condition (2) for the audio track TA' not to protrude at least from the video track Tv1 is expressed by the equation (1
1) and (12). Further, in the recording mode shown in FIG. 5, the condition (2) for the video track Tv and the audio track TA to at least not overlap is the same as equations (13) and (14) in the first embodiment.

Furthermore, in the current recording mode shown in FIGS. 16 and 17, the audio track TA' is arranged as close to the center of the video track Tv' as possible, and the audio track TA' is arranged in one direction from the center of the video track TvI to one side of the audio track TA'. Condition (2) for securing the minimum necessary track width is the formula (211, (22) and the % formula % in the case of the second embodiment.Furthermore, in the recording mode of FIG. 5, the audio track T^
The condition (2) for arranging the card band so that it is as close to the center of the wide guard band G1 between the video tracks TV as possible is that one side of the audio track TA from the center of the wide guard band G1 between the video tracks l"v The goal is to secure the minimum necessary audio track width for recording/playback of high-quality audio signals in the direction.For this purpose, the minimum width 1 of audio track width ta, /mI
n Next to playback, minimum audio track width with high quality)
may be arranged so as to be distributed to both sides of the center of the wide guard band G1 between the video tracks TV. The conditions for this are...(32).

In addition, taking into consideration conditions ■ and ■, the regulations (conditions) regarding the height positions of the upper and lower ends of the audio head change depending on the recording mode. The values θ1(゛), θ, 2(゛) of θa , respectively as in the first embodiment, equations (12) and (1
4) and equations (11) and (13).

Furthermore, taking into account the condition (2), the JJILII (condition) regarding the height positions of the upper and lower ends of the audio head is the value θ83 ('') of Oa ('') that changes depending on the recording mode.

θ84 (°) is expressed by Equations (14), (22), and Equation (13), respectively.

(21). This corresponds to all θ and θ in the second embodiment.
In' alaX corresponds.

Furthermore, taking into account the condition (i), the height position of the upper and lower ends of the audio head is set as follows: II! (condition) changes depending on the recording mode, the value θa5 (°) of Oa (°)
, Oa6('') are equations (11), (31) and %2), respectively.) From the above relationships, the preceding mounting relative angle θa of the audio head with respect to one video head, and the lower end of the video head. The mounting height of the lower end of the audio head used as a reference is @t-1a, and the head width Wa is as follows depending on the size relationship of the track pitch P. Namely, (a) P≧p'+2tv-t When 1, θ81≦ff
1ln θ,5. θ86≦08□ (see Figure 12), and in this case θ, 5 (-θ ・)≦θa≦086 (=θatll
In the range of 1 BIn of aX', the condition for Wa1 mouth a becomes taii'n≦Wa≦WV from equations (11) and (12).

(b) When P≧p'+tv, θ, 3≦θa5≦θ1
≦θa2≦θ, 6≦θ, 4 (see Figure 11), and in this case, θ = θ and θ = θ, so this a
5 am+n'a6 Oa at amax (°
) conditions for Wa and day a in each size range are as follows. That is, (i) θ (=θ , )≦θa≦θ, 1, the formula % formula % ) Formula (11).

From (12), (iH)θ ≦θa≦086 (−θa+nax),
Formula % Formula %) θ and θ84≦θ86 (see Figure 13), and at this time θ ≦θ ・θ = θ, so this a3
The conditions for Wa1 mouth a in each size range of Oa when aIl+n+a4amax are as follows.

That is, (1) When θ (-θ,)≦Oa≦081, the formula % formula % ) Formula (13).

(14) to (iii) θ ≦θa≦θ, 4 (=081Ilax), formula a1 (13), (12) to tv+t ・ (d) When P≦P′+, θ ≦θ
In addition, θ84≦θ81 (see Figure 14), and a2
a3 At this time, θ, 3(=081.)≦θa≦θa4(=θ,
, X>, the condition of Wa9kua from equations (13) and (14) is taIin≦Wa≦P-P'.

In this third embodiment, as shown in FIG. 16, in particular,
The video track width tv is the track pitch P of the current recording mode.
When matching ', tv-p', P' θal=180x P-P.

θ, = 180 becomes.

(a') When P≧3P'-t, θ, 1≦θa5
゜mIn θ, 6≦θ82 (see Figure 12), and at this time θa
5(=θ, 〉≦θa≦θa6(=θ,,X), men From equations (11) and (12), the conditions for Wa and Ha are
iin≦Wa≦P' (=Wv).

(b') When P≧2P', θa3≦θ, 5≦θ,
1≦θ, 2≦θa6≦θ84 (see Figure 11),
Wa and Ha in each size range of θa (°) at this time
The conditions are the same as in the case of (+1 to (iii)) of (a') in the first embodiment.

(When C' J P≦2P', θ85≦θ, 3.θ,
2≦θa1. θa4≦θa6 (see Figure 13),
At this time, the conditions of Wa2 mouth a in each size range of θa (°) are the same as in the case of (+) to (H) of (b') in the first embodiment.

θ, 2≦θ, 3. θ, 4≦θ, (see Figure 14), and Wa in each size range of θa (°) at this time.

The conditions for Ha are the same as in the case (C') of the second embodiment.

Fourth Embodiment> The fourth embodiment is based on the conditions of the first to third embodiments (i.e., in the current recording mode shown in FIGS. ■ In the recording mode shown in FIG. 5, the video track Tv and the audio track TA at least do not overlap. ■ In the current recording mode shown in FIGS. 16 and 17, the audio track TA is as close to the video track T■' as possible. The audio track TA should be placed near the center, and the minimum necessary track width should be secured in one direction of the audio track TA' from the center of the video track Tv'. Arrange it so that it is near the center of the wide guard band G1 between the tracks TV, and secure the minimum necessary track width in one direction of the audio track TA from the center of the wide guard band G1 between the video tracks Tv. In doing so, it is compatible with the current VTR in the current recording mode or each VTR in the recording mode shown in Figure 5.
In order to set the best compatibility between TRs, ■ arrange the audio track T^' so that the center coincides with the center of the video track TV' in the current recording mode;
(2) In the recording mode shown in FIG. 5, the condition is that the centers of the audio tracks 1 to Rack T^ are arranged so as to coincide with the center of the wide guard band G1 between the video tracks TV.

Fig. 15 shows Fig. 16 and 1 of the above fourth embodiment.
This is a diagram schematically showing the relationship between the track pattern and the head in the current recording mode shown in FIG. 7 and the recording mode shown in FIG. The vertical axis represents the track size on the magnetic tape (the height in the direction of the rotation axis of the drum), where Tv' is the video l/rack in the current recording mode, and 7'v is the video track in the recording mode shown in Figure 5. show.

Note that the range indicated by the thick line in FIG. 15 is the position where the audio can be mounted with respect to the video head mounting position (with the lower end position of the head as the origin) that satisfies the conditions of the fourth embodiment. lower end position>.

In the current recording mode shown in FIGS. 16 and 17, the center of the audio track T' coincides with the center of the video track TV', so that in the recording mode shown in FIG. 5, the center of the audio track TA and the center of the video track Wide guard band G1 between Tv
Since the centers of

It follows from the above equations (41) and (42). However, V' indicates the tape speed in the current recording mode shown in FIGS. 16 and 17, and ■ indicates the tape speed in the recording mode shown in FIG. 5, respectively.

By the way, in the practical range of normal VTRs, when forming a slope 1 to easy pattern on a tape, the scanning angle of the head with respect to the tape (i.e., the slope 1 to 1 pattern formed on the tape is
~ rack inclination angle) is within 10° (usually 2 to 6° culm), and when forming the track pattern, H
The misalignment (number of stitches) αH for alignment recording is 10 or less (H is the length equivalent to one horizontal scanning period) or less (usually 0.
5 days to 3.50), so it can be taken as v/v'SαH/αH'. However, αH' is shown in Fig. 16 and 1.
The deviation in the current recording mode B in FIG. 7 and αH indicate the H deviation in the recording mode in FIG. 5, respectively.

Therefore, ea'==90X a" αH−αH′ It can also be expressed as

Conditions (1) and (4) in this fourth embodiment [Formula (41)].

Since the % formula %, the formulas (11), (12), (13), (14
) is always true. Furthermore, since ta≧tan+in, equation (21).

The conditions (22), (31), and (32) also always hold true.

Based on the above relationship, the lower end of the audio head should be installed at height position B a1 head width W based on the lower end of the video head.
a becomes as follows depending on the magnitude relationship of the track pitch P. That is, (a) When P≧p' +tv, <amin≦Wa≦Wv.

(b) When P≦p’+tv tamin””≦P−P’ becomes.

Especially video track width tv The current record of tigers Tsuku pitch P' When matching tv w　P　　’ (at ) P≧2P’ At the time of t, ≦Wa lln ≦P′ (=WV 〉 becomes.

(b’ ) P≦2P’ At the time of t, ≦Wa lln ≦P-P' becomes.

From the above, in the first to fourth embodiments described above, at least the following must be satisfied as common conditions regarding the arrangement of the video head and the audio head. That is, in the current recording mode shown in FIGS. 16 and 17, since the video track width tv does not exceed the track pitch P', tv≦P', and furthermore, the audio track TA' protrudes from at least the video track TV'. t than not, ≦ta
≦tv mIn. However, ta is the audio track width, tamin is for recording/playing high-quality audio signals, and is also the minimum high-quality audio track width (in the VH3 system of current VTRs, N
20μg+ by TSC method, t'16μm by PAL method
,! l: standardized).

In addition, in the recording mode shown in FIG.
and audio track T at least do not overlap (i.e.,
Since the audio track TA falls within the wide guard band G1 between the video tracks Tv, ta≦P-tv (where P is the track pitch), but in the current recording mode, the video track TV is the maximum track width. Considering compatibility with a VTR having a track pitch P', the above equation becomes ta≦P-P'.

Therefore, the arrangement of the video head and audio head to satisfy the above conditions is as follows in the current recording mode shown in FIGS. 16 and 17, and in the recording mode shown in FIG. 5, and further, for the minimum audio track width tamin. , it is necessary to make it so that .

By arranging the video head and audio head to satisfy the above conditions, compatibility with current VTRs can be maintained, and separate recording/playback of track patterns as shown in Fig. 5 can be performed without increasing the number of heads. Can be done.

[Effects of the Invention] As described above, according to the present invention, in one VTR device, a common video head and audio head configuration enables the current S-VHS system and S-VHS system (first recording/
It is possible to selectively perform recording/playback of the video track and audio track (separately for the video track and audio track) and recording/playback of the separate method (second recording/playback method) using a rack. This can be done at low cost without increasing the number of heads.

Therefore, the current VH8 system and S-■口S system recording/
For playback, of course, other VH8 format or 5-V
Fully compatible with H8 format VTRs.

In addition, in this separate recording/playback method, the video track and audio track are formed on separate tracks, so insert editing of the video signal and post-recording editing of the audio signal can be performed independently. Become,
This makes it possible to provide sufficient functions as a commercial VTR.

In addition, since it is possible to reliably prevent crosstalk between adjacent tracks and talk from the audio track, it is possible to achieve even higher image quality, and it is possible to provide a VTR that is more desirable as a business VTR. Can be done.

Furthermore, especially for devices that can selectively record/play back audio signals into FM audio signals and digital audio signals, it is possible to record/play back audio signals as digital audio signals as needed, thereby eliminating deterioration caused by dubbing or dubbing. You can always edit with high quality audio.

Therefore, even when editing is performed by dubbing or dubbing, it is possible to provide high-quality audio commensurate with high-quality video.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing the configuration of a recording system of a recording/playback device according to an embodiment of the present invention, FIG. 2 is a block system diagram showing the configuration of a playback system, and FIGS.
The figure shows an example of the arrangement relationship of each head in the apparatus of the present invention, and FIG. 5 shows recording and formation by the apparatus of the present invention]
・Figure 1 shows an example of the rack pattern, Figures 6 to 15 are diagrams showing track pattern relationships to explain compatibility with the current system VTR, and Figure 16 shows the current system VTR.
FIG. 17 is a diagram showing another example of a track pattern according to the current system VTR. 1... Composite color video signal input electronic, 1... 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, 30
b, 47-...Frequency demodulator, 35...Reproduction chroma processing circuit, AI, Δ2...Audio head, Mouth a...Height position of audio head, P, P'・
...Track pitch, T...Magnetic tape, TAl, T
A2. TA3...Audio track, Tvl, Tv2. ”
V3' TV, TV' = video track, tv
...Track width of the video track, ta...1-rack width of the audio track, talin...Minimum audio track width 1, V2...Video head, ...Head width of the audio head, ... Head width of video head, relative angle of advance installation of audio head. Patent Applicant: Japan Victor Co., Ltd. Representative: Kunio Kakiki 2111 匈−1 (a) P≧P'+ tV no 4 ma 1 luxury system (b) When P≦P'+t, the diagram below is shameful. 1 Steel point f2 Saito 4yl (a) P≧P'+t, n time Figure 42 Leg #l (b) P 6 P+ t v c
r= Time chart Figure 16 Figure 7 Figure procedural amendment February 17, 1990

Claims (1)

[Scope of Claims] First and second video heads having gaps of mutually different azimuth angles, which are respectively attached to opposing positions on the rotating surface of the rotating body; and first and second audio devices each having a gap having a different azimuth angle, the video head and the rotating body being mounted at different height positions and azimuth angles in the direction of the rotational axis of the rotating body; a magnetic tape running at a standard tape speed and recording or reproducing a video track superimposed by the video head on the audio track recorded by the audio head; and a second recording/playback mode in which a magnetic tape is run at a tape speed higher than the standard tape speed, and audio tracks and video tracks are alternately arranged adjacent to each other and are recorded or reproduced. A magnetic recording/reproducing device that selectively performs the following: the track width of the video track is tv, the track width of the audio track is ta, and the height of the lower end of the audio head with respect to the height position of the lower end of the video head. The position is Ha, and the relative angle of the preceding mounting of the audio head in the direction of head rotation with reference to the mounting position of the first video head on the rotating body is θa.
(°), where the track pitch of the video track in the first recording/playback mode is P', and the track pitch of the video track in the second recording/playback mode is P, the arrangement of the video head and audio head is , the first
In the recording/reproduction mode, Ha≧P′×θa/180 Ha+ta≦P′×(θa/180)+tv, and in the above second recording/reproduction mode, Ha≧P×([θa/
180]-1)+([P'+tv]/2)Ha+ta≦
P×θa/180-(P'-tv)/2, and further,
When the minimum audio track width required to record/play back high-quality audio signals is tamin, 90 x [2 tamin + (P'-tv)]/[P-P'
]≦θa≦90×[2(P-tamin)-(P'-t
v)]/[P-P'].