JPH03130902A - Rotary head type multilayer recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the degradation of picture quality and sound quality by enlarging head width as much as the head to record a surface layer. CONSTITUTION:The respective heads are arranged to a drum 25 like a figure. Azimuth angle theta1 of heads 26a and 26b for FM sound signal are set to +30 deg. and -30 deg., azimuth angles theta2 of heads 27a and 27b for PCM sound signal are set to +20 deg. and -20 deg., and azimuth angles theta3 of heads 29a and 29b for EP video signal are set to -6 deg. and +6 deg.. A relationship among head width W1 of the heads 26a and 27b for FM sound signal in the case of a TE track pitch, head width W2 of the heads 27a and 27b for PCM sound signal and head width W3 of the heads 29a and 29b for EP video signal is set to be TE<W1<W2<W3. Since the head width is enlarged as much as the head to record the surface layer, the signal of a deep layer part is not exposed at the starting point or the ending point of an inserting spot even at the time of inserting and recording in the case of multilayer recording without card band, and it is not necessary to overwrite the signal of the surface layer more then is needed and, the degradation of the picture quality and the sound quality can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording and reproducing device that records high-quality audio signals in multiple layers using a rotating head and is compatible with current video tape recorders (hereinafter abbreviated as VTR). It is something.

[Conventional technology]

Figure 8 is a system diagram showing the conventional old FiVTR. In the figure, 1 is the FM audio signal input terminal, and 2 is the FM audio signal input terminal.
Modulated audio signal recording processing section, 3 is an FM audio signal recording amplifier, 4 is a recording/reproduction changeover switch, 5 is an FM audio signal reproduction amplifier, 6 is an FM modulated audio signal reproduction processing section, 7 is an FM
This is an audio signal output terminal. Further, 15 is a video signal input terminal, 16 is a video signal recording processing section, 17 is a video signal recording amplifier, 18 is a recording/playback changeover switch, 19 is a video signal playback amplifier, 20 is a video signal playback processing section, and 21 is a video signal playback processing section. A video signal output terminal, 22 an erasing signal generator, 23 an erasing head amplifier, 24 a control unit, 25 a rotating drum, 26
a and 26b are FMM voice signal recording and reproducing heads provided on the drum 25; 28a and 28b are standard mode (hereinafter referred to as SP) video signal recording and reproducing heads also provided on the drum 25; 29a and 29b are also the same. A 3x mode (hereinafter referred to as BP) video signal recording/reproducing head is provided on the drum 25, an erasing head 30 is also provided on the drum 25, and 31 is a magnetic tape.

FIG. 9 is a head arrangement diagram on the drum 25 of a conventional HiFi VTR, and FIG.
FIG. 3 is a diagram showing the level difference in drum attachment of each head of the VTR.

FIG. 11 is a frequency spectrum diagram of a recording signal of a conventional old FiVTR, in which (a) shows a video signal;
42 is a chromaticity signal subjected to low frequency conversion, and a luminance signal. or,
44 is a carrier wave frequency of 1.3Mz) 45 is a carrier wave frequency of 1.7MHz
This is a two-channel FM modulation signal.

FIG. 12 is a diagram of a recording pattern in the thickness direction of a magnetic tape 31 by conventional 1 (iFi VTR). 53 and a deep layer 55 are formed.

FIG. 13 is a diagram of a track pattern on a magnetic tape 31 in a conventional)IiFiVTR17)EP%-
61 is an FMM voice recording track, 63 is a video recording track, 64 is a recorded track, and T4 is a track pitch.

Fig. 14 is a timing diagram during insertion recording in the conventional (7) HiPiVTR + 7) EP mode F; (a)
is the switching signal of the FM sound audio signal land 26a26b, (
b) is the switching signal for the EP video signal heads 29a and 29b, (C) is the insertion point, (d) is the erasure signal control signal, (e
) is an FM audio signal recording control signal, and (f) is an EP video signal recording control signal, and these signals are output from the control section 24.

Next, the operation will be explained. Each head is provided with respect to the drum 25 in the arrangement shown in FIG. 9, and as shown in FIG. 1O, an FMM voice signal head 26a.

The azimuth angle θ of 26b is +30° and −30”, respectively.
, the azimuth angle θ of the EP video signal heads 29a and 29b
, are -6@, +6@, and the FMM voice signal heads 26a, 2 when the track pitch is T as shown in FIG.
6b head width W, and EP video signal head 29a,
The relationship between head width W of 29b is TE < W x ≦
Let it be W. Also, there is a step H between the erasing head 3o and the FMM voice signal heads 26a, 26b, and the FMM voice signal heads 26a, 26b and the BP video signal head 29a.
, 29b is set as follows.

Hz-TtX (2 + upstream 180") FM audio signals and video signals are recorded by the VTR shown in FIG. The unit 2 supplies the signal component as shown in FIG.
6a and 26b record to the deep layer of the magnetic tape 31.

Also, during reproduction, the signals reproduced from the magnetic tape 31 for FM audio signals by the 7-domains 26a and 26b are supplied to the FMM voice signal reproduction amplifier 5 via the recording/reproduction changeover switch 4 in the reproduction mode, and the FM audio signals are The signal reproduction processing section 6 restores the original audio signal and outputs it from the FMM audio signal output terminal 7.

Similarly, the video signal input to the video signal input terminal 5 is processed by the video signal recording processing section 6 as shown in FIG.
) is supplied to the recording/reproduction changeover switch 18 via the video signal recording amplifier 17, and recorded on the surface layer of the magnetic tape 31 by the video signal heads 29a, 29b in the recording mode. During reproduction, the signals reproduced from the magnetic tape 31 by the video signal heads 29a and 29b are transferred to the recording/reproduction selector switch 1 in the reproduction mode.
The video signal is supplied to the video signal reproduction amplifier 19 via the video signal reproduction processing section 20 , restored to the original video signal by the video signal reproduction processing section 20 , and outputted from the video signal output terminal 21 .

Furthermore, as described above, due to the head arrangement shown in FIG. 9 and the head height difference shown in FIG. 10, the recording pattern in the thickness direction of the magnetic tape 31 is the 121st! l, and in the deep part 55 there is F.
An M audio signal is recorded, and a video signal is recorded on the surface layer portion 53.

The recording pattern on the magnetic tape 31 is as shown in FIG. 13, with the FM audio signal head 26a having a head width W1,
On the pattern in which the FM audio signals are alternately recorded by the FM audio signals 26b, the video signal rads 29a and 29b of the head width W record the video signals alternately with a delay of 2T hook. The head widths W1゜W, are both larger than the track pitch Tt, but the final track width that remains is the track pitch TE, and the head width W1゜W is larger than the track pitch Tt.
The pattern of the video signal head 29a overlaps the pattern a, and the pattern of the video signal head 29b overlaps the pattern of the FM audio signal head 26b.

When performing insertion recording in the above-mentioned VTR, assuming that the head width of the erasing head 30 is Ttx 6, in FIG. supply to,
After erasing the green signal at the insertion point to its depth, the FM audio signal and video signal are recorded as described above.

The control timing at this time is as shown in Fig. 14, in which the erasure signal shown in (d) is output to the insertion point shown in (C), and the FM audio signal shown in (e) and the FM audio signal shown in (f) are output. Record the video signal shown in . Here, the reason why the recording current of the video signal shown in (f) increases by one track at both the starting point and the ending point with respect to the insertion point is that the FM audio signal head 2
The head width W of 6a and 26b is the video signal head 29a,
This is because the width W3 of the head 29b is equal to or larger than the head width W3 of the head 29b. This is because only the video signal is overwritten in order to avoid negative effects.

[Problem to be solved by the invention]

Conventional HiFi VTRs are configured as described above, and during normal recording and playback, a two-layer recording pattern with the track pitch width is formed and there is no problem. However, during insertion recording, the FM audio signal head is more sensitive to video. If the width of the head is greater than or equal to that of the signal head, and the height difference between the heads deviates from the predetermined height difference, the deep FM audio signal will be exposed at the start or end point of the insertion section. To prevent this, it is necessary to record extra video signals, which poses the problem of deteriorating image and sound quality.

This invention was developed to solve the above problems, and eliminates the need to record extra video signals not only during normal recording and playback but also during insertion recording.
An object of the present invention is to obtain a rotary head type multilayer recording and reproducing device that can prevent deterioration of image quality and sound quality.

[Means to solve the problem]

The rotary head type multilayer recording and reproducing apparatus according to the present invention includes an FM audio signal recording and reproducing head for recording and reproducing FM audio signals on a magnetic recording medium, and a head for recording and reproducing FM audio signals whose head width WI is larger than the track pitch; A head for recording and reproducing PCM audio signals whose head width for reproducing is W larger than Wl, a head for recording and reproducing video signals having a head width W larger than W2 for recording and reproducing video signals on a magnetic recording medium, and a magnetic recording medium. A means is provided for recording a PCM audio signal so as to overlap the recording trace of the FM audio signal, and for recording a video signal so as to overlap the recording trace of the FM audio signal and the PCM audio signal.

(Function) In this invention, the width of the head for recording signals on the surface layer of the magnetic recording medium is increased, so that even during insertion recording, signals recorded in the deep layer at the start or end point of the insertion point are exposed. do not.

〔Example〕

Hereinafter, the first embodiment of the present invention will be explained with reference to the drawings.
The figure is a system diagram of a VTR according to this embodiment, in which 8 is a PCM audio signal input terminal, 9 is a PCM audio signal recording processing section, 10 is a PCM audio signal recording amplifier, 11 is a recording/playback switch, and 12 is a PCM audio signal input terminal. signal reproduction amplifier,
13 is a PCM audio signal reproduction processing section, 14 is a PCM audio signal output terminal, and 27a and 27b are heads for recording and reproducing PCM audio signals. The other configurations are the same as those shown in FIG.

FIG. 2 is a diagram showing the arrangement of heads on the drum 25 of the VTR according to this embodiment, and FIG. 3 is a diagram showing the differences in the drum attachment levels of each head.

FIG. 4 is a frequency spectrum diagram of a VTR recording signal according to this embodiment, where (a) shows a video signal;
1 is a chromaticity signal subjected to low frequency conversion, and 42 is a luminance signal. Further, 0) indicates a PCM audio signal, and 43 indicates a signal having a carrier frequency of 2.5 MHz subjected to offset four-phase differential phase shift modulation (hereinafter referred to as 0QPSK modulation).

(C) shows an FM audio signal, 44 is a carrier wave frequency of 1.3M1 (z, 45 is a carrier wave frequency of 1.7 MH
This is a two-channel FM modulation signal of Z.

FIG. 5 is a recording pattern diagram in the thickness direction of the magnetic tape 31 of the VTR according to this embodiment. The magnetic tape 31 is composed of a base film 52 and a magnetic material 51.
1, a surface layer portion 53, an intermediate portion 54, and a deep layer portion 55 are formed.

FIG. 6 is a track pattern diagram on the magnetic tape 31 in the EP mode of the VTR according to this embodiment, in which 61 is an FM audio recording track, 62 is a PCM audio recording track, 63 is a video recording track, 64 is a recorded track, T
, is the track pitch.

FIG. 7 is a timing chart during insertion recording in the EP mode of the VTR according to this embodiment. ) is a recording control signal for an FM audio signal and a PCM audio signal. The rest is the same as in FIG. 14, and these signals are output from the control section 24.

Next, the operation will be explained. Each head is provided with respect to the drum 25 in the arrangement shown in FIG.

Further, as shown in FIG. 3, an FM audio signal head 26a
, azimuth angle θ1 of 26b is +30" -30@, P
Azimuth angle θ2 of CM audio signal heads 27a and 27b
+20', -20'' and BP video signal end 29a
, 29b are set to -6'' and +6'', and the FM audio signal head 26 a has a track pitch of T.
, 26 b(7) Spatula)' Width w1 and head width W of spades 27a and 27b for PCM audio signals! The relationship between and the head width W of the EP video signal heads 29a and 29b is T E
< W + < W z < W s. Also, an erasing head 30 and an FM audio signal head 26a.

26b and the PCM audio signal heads 27a and 27b, the height difference H between the FM audio signal heads 26a and 26b and the PC
The height difference H2 between the M audio signal heads 27a, 27b and the EP video signal heads 29a, 29b is set as follows.

The VTR shown in FIG. 1 having each of the above-mentioned heads allows FM
Record audio signals, PCM audio signals, and video signals. First, audio is input manually to the FM audio signal input terminal 1 or the PCM audio signal input terminal 8. The signal input to the input terminal 1 is processed by the FM modulated audio signal recording processing section 2 as shown in Fig. 4 (C
), and is supplied to the recording/reproduction changeover switch 4 via the FM audio signal recording amplifier 3, and is output to the FM audio signal head 26a in the recording mode.

26b, the data is recorded in the deep layer 55 of the magnetic tape 31. When playing an FM audio signal, the FM audio signal head 2
The signals reproduced from the magnetic tape 31 by 6a and 26b are transferred to FM via the recording/reproduction changeover switch 4 in the reproduction mode.
The signal is supplied to the audio signal reproduction amplifier 5, restored to the original audio signal by the FM modulated audio signal reproduction processing section 6, and outputted from the FM audio signal output terminal 7. On the other hand, the signal input from the PCM audio signal input terminal 8 is converted by the PCM audio signal recording processing unit 9 into signal components as shown in FIG. The signal is supplied to the recording/reproduction changeover switch 11 and recorded on the intermediate layer section 54 of the magnetic tape 31 by the PCM audio signal heads 27a and 27b.

When reproducing a PCM audio signal, the magnetic tape 31 is
The signals reproduced by the M audio signal heads 27a and 27b are supplied to the PCM audio signal amplifier 12 via the recording/reproduction changeover switch 11 in the reproduction mode, and are restored to the original audio signals by the PCM audio signal reproduction processing section 13. , PC
The M audio signal is output from the output terminal 14.

Further, the video signal is input to the video signal input terminal 15, converted by the video signal recording processing section 16 into signal components as shown in FIG. The signal is supplied to the changeover switch 18 and recorded on the surface layer 53 of the magnetic tape 31 by the video signal heads 29a and 29b. When reproducing a video signal, the signal reproduced from the magnetic tape 31 by the video signal heads 29a, 29b is transferred to the recording/reproducing selector switch 1 in the reproducing mode.
The video signal is supplied to the video signal reproduction amplifier 19 via the video signal reproduction processing section 20 , restored to the original video signal by the video signal reproduction processing section 20 , and outputted from the video signal output terminal 21 .

Further, due to the head arrangement shown in FIG. 2 and the head height difference shown in FIG. 3, the recording pattern in the thickness direction of the magnetic tape 31 becomes as shown in FIG. 5, and an FM audio signal is recorded in the deep layer 55.
A PCM audio signal is recorded in the intermediate layer section 54, and the surface layer section 5
3, a video signal is recorded.

The recording pattern on the magnetic tape 31 is as shown in FIG.
, 26b, the head width W! PCM audio signal head 27a,
27b alternately records PCM audio signals, and 2-L
Video signal head 29 with head width W, delayed by a track.
a and 29b alternately record video signals. The head widths WllW, , W are both larger than the track pitch Tt, but the final track width that remains is the track pinch Tt, and there is no P on the pattern of the FM audio signal head 26a.
The patterns of the CM audio signal head 27a overlap, and the pattern of the video signal head 29a further overlaps thereon. Further, the pattern of the PCM audio signal head 27b overlaps the pattern of the FM signal head 26b, and the pattern of the video signal head 29b further overlaps thereon.

When performing insertion recording in the above-mentioned VTR, assuming that the head width of the erasing head 30 is 'l'tx 6, in FIG.
FM
Audio signals, PCM audio signals, and video signals are recorded as described above. The control tie at this time is as shown in Figure 7, and due to the head arrangement and head height difference as described above, the erase signal shown in (d) is outputted to the insertion point as shown in (C). After that, the FM audio signal shown in (e) and P
A CM audio signal and a video signal shown in (f) are recorded.

In the above embodiment, there is one erase head 30 and the head width is T2×6, but as shown by the dotted line in FIG. Let be T,×3, and let the level difference between both heads be zero,
The end point of the erase signal control signal during insertion recording may be delayed by two tracks (one rotation of the drum), and the mounting angle and level difference of the head may be adjusted in the order of FM audio signal, PCM audio signal, and video signal from the deepest layer. Any selection may be made as long as multi-layer recording is possible.

Furthermore, the recorded signal frequency spectrum only needs to have the occupied bands in the same order as shown in FIG.
The M audio signal and video signal may be recorded and reproduced in any combination. Also, the head width of each head is T t
Any relationship may be used as long as < W + < W Z < W 3 , but it is desirable that W 3 < T t X 1 , 5.

(Effects of the Invention) As described above, according to the present invention, since the head width of the head that records on the surface layer is increased, even when inserting recording in the case of multi-layer recording without a guard band, the starting point of the insertion point or Since deep layer signals are not exposed at the end point and there is no need to overwrite surface layer signals, deterioration of image quality and sound quality can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a VTR according to the present invention, and FIG. 2 is a head arrangement diagram on a drum of a VTR according to the present invention.
FIG. 3 is a diagram of the drum mounting level of each head of the VTR according to the present invention, FIG. 4 is a frequency spectrum diagram of the recording signal of the VTR according to the present invention, and FIG. 5 is a recording pattern in the thickness direction of the magnetic tape of the VTR according to the present invention. 6 is a track pattern diagram on a magnetic tape in the BP mode of the VTR according to the present invention, and FIG. 7 is a track pattern diagram of the VTR according to the present invention in the BP mode.
Timing diagram during insertion recording in P mode, Figure 8 is a system diagram of a conventional VTR, Figure 9 is a diagram of the head arrangement on the drum of a conventional VTR, and Figure 10 is the drum attachment of each head of a conventional VTR. Step diagram, Figure 11 is a conventional VTR
Figure 12 is a frequency spectrum diagram of the recorded signal of the conventional V
Recording pattern diagram in the thickness direction of the TR magnetic tape, No. 13
The figure is a track pattern diagram on a magnetic tape in the EP mode of a conventional VTR, and FIG. 14 is a timing chart during insertion recording in the EP mode of a conventional VTR. 2...FM modulated audio signal recording processing unit, 6...FM modulated audio signal reproduction processing unit, 9...PCM audio signal recording processing unit, 13...PCM audio signal reproduction processing unit, 16...
- Video signal recording processing section, 20... Video signal reproduction processing section, 22... Erasing signal generation section, 24... Control section, 25
...Drum, 26a, 26b...FM audio signal recording/playback head, 27a, 27b...PCM audio signal recording/playback head, 29a, 29b...EP mode video signal recording/playback head, 30 ...Erasing head, 31.
...Magnetic tape, 53...surface layer part, 54...intermediate layer part, 55...deep layer part. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a magnetic recording and reproducing device that records and reproduces audio signals and video signals on a magnetic recording medium, an FM audio signal recording and reproducing head is provided on a rotating drum and is used to record and reproduce FM audio signals on the magnetic recording medium.The head width W_1 is larger than the track pitch. and W_2, which is provided on the rotating drum and has a head width larger than W_1 for recording and reproducing PCM audio signals on the magnetic recording medium.
A PCM audio signal recording and reproducing head of PCM audio signal recording and reproducing head provided on a rotating drum for recording and reproducing video signals on a magnetic recording medium, a video signal recording and reproducing head of W_3 whose width is larger than W_2, and a head for recording and reproducing video signals on a magnetic recording medium provided on a rotating drum. A PCM audio signal is recorded by an erasing head for erasing the recording trace and a PCM audio signal recording/reproducing head so as to overlap the recording trace of the FM audio signal on the magnetic recording medium, and the PCM audio signal is superimposed on the recording trace of the FM audio signal and the PCM audio signal. A means for recording a video signal using a video signal recording/reproducing head, and an erasing head for erasing only the portion to be inserted and recorded when inserting and recording another signal into an already recorded portion of a magnetic recording medium,
A rotary head type multilayer recording and reproducing device characterized in that it is provided with means for causing each of the recording and reproducing heads to record a new signal only in this erased portion.