JPH0823968B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 2-head helical scan type information recording / reproducing apparatus, and is particularly suitable for recording / reproducing a signal obtained by time-compressing an audio signal. Magnetic recording / reproducing apparatus. 2. Description of the Related Art A VH having a tape pattern shown in FIG. 6 is a conventional example of a two-head helical scan type information recording / reproducing apparatus.
There are home video tape recorders represented by the S system, and home video tape recorders called the 8 mm video standard whose tape pattern is shown in FIG. In FIG. 6, 1 is a video tape, 2 is a video track on which a video signal is recorded, 3 is a control track on which a control signal is recorded, 4 is an audio track on which an audio signal is recorded, and 5 is a rotary head. The arrow indicating the tracing direction and the arrow 6 indicating the running direction of the video tape. Here, θ1, θ2, and θ3 are winding angles of the video tape 1 wound around the rotary cylinder, respectively, and θ1≈θ3≈5 ° and θ2≈180 °. θ
2 corresponds to the period during which the video signal is recorded, and θ1 and θ3
Is a margin for ensuring compatibility. In FIG. 7, reference numeral 7 denotes a track on which a signal obtained by converting an audio signal into a PCM signal and further time-compressed by about 1/6 is recorded, 8 is a first option track, and 9 is a second option track. Is. Where θ1, θ
2, θ3, and θ4 respectively indicate the winding angles of the video tape wound around the rotary cylinder, and θ1≈θ3≈5
°, θ2≈180 °, θ4 = 30 °. θ4 corresponds to the period in which the audio signal is recorded, and θ1, θ2, and θ3 are the same as those in FIG. As described above, in the above-mentioned conventional technique, only one or two kinds of information can be recorded on one slanted track, and the range of use of the video tape is narrowed. Was there. An object of the present invention is to provide a magnetic recording / reproducing apparatus which eliminates the above-mentioned drawbacks of the prior art and enables recording / reproducing of a plurality of types of information on one slanted track, thereby expanding the range of use of a cassette tape. Especially. In order to achieve the above-mentioned object, according to the present invention, first and second recording modes can be selected, and the first recording mode is on a magnetic tape. Divides the whole range traced by the rotary head into first and second sections in the width direction of the magnetic tape, and generates a video signal in each period when the rotary head traces the first section, First means for generating a first desired information signal each time the rotary head traces the second section, and the first section for each time the rotary head traces the first section. Means for generating a tracking control signal assigned to the second section, and a tracking control signal assigned to the second section every time the rotary head traces the second section; Said video signal from said means, said first
Desired information signal and the tracking control signal from the second means are multiplexed and supplied to the rotary head by the third means, and the video signal and the tracking control signal are supplied to the first section. Is a mode for recording a multiplex signal of the first desired information signal and the tracking control signal in the second section, and the second recording mode is for recording on the magnetic tape. The entire range traced by the rotary head is divided into a plurality of sections in the width direction of the magnetic tape,
Fourth means for designating any of the sections and fifth means for sequentially generating the second desired information signal only for each period in which the rotary head traces the section designated by the fourth means. And a sixth means for generating the second desired information signal of the fifth means and a tracking control signal assigned to the designated section, and a sixth means for outputting the tracking control signal from the fifth means. The second desired information signal is provided in an arbitrary designated section by the seventh means for multiplexing the desired information signal of 2 and the tracking control signal from the sixth means and supplying the same to the rotary head. And a recording mode in which a multiplexed signal of the tracking control signal and the tracking control signal can be recorded. In the first recording mode, the video signal generated by the first means and the first desired information signal are multiplexed with the tracking control signal generated by the second means, respectively. Are recorded and recorded in different areas of the track. Also,
In the second recording mode, the magnetic tape is divided into a plurality of sections in the width direction, and information signals can be recorded and reproduced independently for each section. When any of these sections is designated by the fourth means, the information signal is given by the fifth means and the tracking control signal is given by the sixth means while the rotary head traces the designated section. Are generated respectively, and these multiple signals are recorded in this designated section. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, as shown in FIG. 7, a first recording mode for recording a video signal and an information signal such as a time-axis-compressed audio signal, and as shown in FIG. The second recording mode for recording the information signal can be selected. FIG. 3 is a tape pattern diagram showing an example in which the present invention is applied to a video tape recorder of 8 mm video standard. That is, one slanted track is divided into seven tracks 10 to 16, and seven information tracks A to G are provided. In the tape pattern of FIG. 3, 220 ° of tape 1 is placed on the rotating cylinder.
It is wrapped, and A and G tracks are wrapped 35 °,
Tracks B, C, D, E, and F are wound around 30 °. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of an embodiment of a magnetic recording / reproducing apparatus according to the present invention. Further, FIG. 2 is a waveform diagram showing signals of respective parts in FIG. 1, and signals corresponding to FIG. 1 are given the same reference numerals. First, the operation of this embodiment when recording the tape pattern shown in FIG. 7 will be described. This is shown in Figure 3.
Convert the audio signal to PCM signal on A track in
Furthermore, the data is compressed and recorded 1/6 times, and B, C, D,
This corresponds to recording video signals on the E, F, and G tracks. In FIG. 1, reference numeral 17 is a video signal input terminal, and 18 is a video signal recording processing circuit. In the video signal recording processing circuit 18, the chroma signal in the video signal is frequency-converted to the low frequency range, and the luminance signal is converted to the FM signal. A switch 19 is connected to the N side in this case. Reference numeral 20 is a write amplifier, which is a switch 19
Output signal of the tape 1 by the rotary heads 23a and 23b.
Recorded in. 22a and 22b are input terminals for two-channel audio signals, and 21 is an audio signal recording processing circuit. In this audio signal recording processing circuit 21, the audio signal is P
It is converted into a CM signal and further time-compressed by about 1/6. 28 is a pilot signal generator, which outputs signals of four different frequencies. That is, each time the level of the output signal (I) of the pulse generator 27 is switched between High and Low, pilot signals having different frequencies are output in the order of f1 → f2 → f3 → f4 → f1 → f2. High and Low of the level of the output signal (I) of the pulse generator 27 are associated with the rotary heads 23a and 23b.
Then, when the rotary head 23a is recording tracks B to F, the level of the output signal (I) of the pulse generator 27 is High, and when the rotary head 23b is recording tracks B to F, pulse generation is performed. The level of the output signal (I) of the device 27 becomes Low. The pilot signal output from the pilot signal generator 28 is associated with the High and Low levels of the output signal (I) signal of the pulse generator 27, and the level of the output signal (I) signal of the pulse generator 27 is High. Sometimes the pilot signal is f1 or f3, and the level of the output signal (I) signal of the pulse generator 27 is Low.
When, the pilot signal is f2 or f4. As an example of the frequency of each pilot signal, f1≈6.5fh, f2≈7.5fh, f3≈1
0.5fh and f4≈9.5fh. However, fh has a horizontal synchronizing frequency. Therefore, the rotary heads 23a and 23b receive the mixed signal of the video signal from the switch 19, the PCM audio signal compressed in the time axis of the audio signal recording processing circuit 21 and the pilot signal from the pilot signal generator 28. Will be supplied. Next, the phase synchronization of the cylinder motor 26 will be described with reference to FIG. When recording a video signal, in order to prevent switching noise from appearing on the screen, the recording position of the vertical synchronizing signal is set to a predetermined position at the lower end of the tape 1 (sections a and b, section g and h, section m in FIG. 3). It is necessary to set it as the boundary between n and n). Therefore, the vertical separation signal is extracted from the video signal by the sync separation circuit 32, and the monomulti 33
A pulse having the waveform shown in FIG. 2 (J) is created. 24a, 2
Reference numeral 4b denotes two magnets attached to the rotary cylinder, and a pulse H is obtained from the pickup head 25 as the magnets 24a and 24b rotate. FIG.
Also, in FIG. 2, a positive pulse is obtained by the magnet 24a attached at a position slightly ahead of the rotary head 23a, and a negative pulse is obtained by a magnet 24b attached at a position slightly ahead of the rotary head 23b. Output signal (H) of pickup head 25
Becomes a signal having the waveform (I) shown in FIG. 2 by the pulse processing circuit 27 including a delay circuit and a waveform shaping circuit.
In this case, the switch 31 is closed to the N side, which allows the phase comparator 30 to obtain a phase error signal between the output pulse (J) of the monomulti 33 and the output signal (I) of the pulse processing circuit 27. To be The phase error signal is amplified by the motor driver 29 and drives the cylinder motor 26. Therefore, the output signal (I) of the pulse processing circuit 27 and the output pulse (J) of the monomulti 33 are as shown in FIG.
As shown in, the phase synchronization is performed in a state where the rising timing of the output signal (I) of the pulse processing circuit 27 is slightly advanced from that of the output pulse (J) signal of the monomulti 33. Next, the control of the capstan motor 45 will be described. In order to make the tape feed speed a fixed value, the so-called quartz lock system is adopted here. That is, the output signal of the rotation speed signal generator including the FG 46 attached to the capstan motor 45 and the pickup head 47 is divided into 1 / N ₅ by the frequency divider 42, and the output signal of the crystal oscillator 39 is divided. The frequency dividers 40 and 41 divide the frequency into 1 / N ₁ × 1 / N ₄ , and the phase comparator 43 compares the phases of the output signals of the frequency dividers 42 and 41. The phase error signal output from the phase comparator 43 is amplified by the motor driver 44 and drives the capstan motor. Next, the case where the time-compressed audio signal is recorded only on the track A in FIG. 3 will be described. In this case, the switches 19 and 31 in FIG. 1 are closed on the A side. Q in FIG. 2 indicates a time axis. That is, while the period elapses as a → b → c → d → e → f → g,
The rotary head 23a traces the A to F tracks in FIG. When approaching the middle of the period g, the rotary head 23b
Begins tracing the A track. In FIG. 2, in the periods g, h, and i, the rotary heads 23a and 23b simultaneously trace the tape. Similarly, the periods a, b,
The rotating heads 23a and 23b are also in c and the periods m, n and o.
Traces the tape at the same time. The pilot signal generator 28 in FIG. 1 is preferably simple and comprises two rotary heads 2.
When 3a and 23b simultaneously trace the tape to record pilot signals, these pilot signals are the same pilot signal. At the moment when the rotary head 23a traces the A track, the rotary head 23b traces the F and G tracks. When forming the tape pattern of FIG. 7, the pilot frequency is set to f1 or f3 when the rotary head 23a traces the B to G tracks, and the pilot frequency is set to f2 when the rotary head 23b traces the B to G tracks. Alternatively, it is set to f4. Therefore, the pilot frequency should be f2 or f4 at the moment when the rotary head 23a traces the A track. In this case, the pilot frequency is f
It is difficult to determine the value to be 2, and there should be no inconvenience even if it becomes f2 or f4. FIG. 4 is a tape pattern diagram when recording is performed only on the A track. In the figure, A1, A3, A5, A7
The track is formed by the rotary head 23a, and A2, A4,
The A6 track is formed by the rotary head 23b. The frequency of the pilot signal recorded in the A1 track is f2 or f4. 2 and 4 show the case where it becomes f2. In this case, A2, A3, A4, A5, A6, A7
The frequencies of the pilot signals of the truck are f3, f4, and
It becomes f1, f2, f3, and f4. Next, the compression timing of the audio signal in this case will be described. The audio signal recorded in the A1 track is a stereo audio signal M in the period a, which is PCM-compressed and time-compressed, and the audio signal recorded in the track A2 is signals M and A3 in the period bg. The audio signal recorded on the track is a converted signal of the signal M in the period from h to m. The advantage of doing so is that the control signal to the audio signal processing circuit 21 can be only the output signal Li (FIG. 1) of the data selector 36, as described below. Further, there is an advantage that the time for storing information in the memory is minimized. Next, how to generate the timing pulse (K) (FIGS. 1 and 2) necessary for the above signal processing will be described. In the tape pattern shown in FIG. 3, the winding angle is 180 °
The minute track is equally divided into BG tracks. The signal representing the period corresponding to this 180 ° wrap angle is the output signal (I) of the pulse processing circuit 27 (FIG. 2) and is therefore phase-locked to this signal (I) and 6 of this signal (I). A signal having a doubled frequency may be used as the timing pulse. This timing pulse is used as a signal (K). For example, when the present invention is used for an NTSC type 8 mm standard video tape recorder, the cylinder motor 26 needs to rotate at about 30 Hz. If the frequency of the crystal oscillator 39 is 3.58 MHz (color subcarrier frequency), N ₁ × N ₂ × N ₃ ≈119438 may be set. The switch 31 is closed to the A side, and the output signal (O) of the frequency divider 34 and the output signal (I) of the pulse processing circuit 27.
And are phase-synchronized, and the phases and frequencies of these signals (O) and (I) are the same, as shown in FIG. Therefore, if the frequency division ratio N ₃ = 6 is used in the frequency divider 34, the above-mentioned predetermined timing pulse (K) can be obtained. Frequency divider 3
5 divides this timing pulse (K) into 1/6 and 6
Different types of phases (0 °, 60 °, 120 °, 180
°, 240 °, 300 °) signals (L ₁ , L ₂ , ...,
L ₆ ) is generated. The data selector 36 selects _{one of} the signals L _{1 to} L ₆ according to the track to be recorded. For example, when recording on the A track, the signal L ₁ is selected, and when recording on the B track, the signal L ₂ is selected. The output signal Li of the data selector 36 (where i = 1, 2, ..., 6) controls the pilot signal generator 28 to generate the pilot signal as indicated by P ₁ and P _{2 in} FIG. To gate. The pilot signal is the audio signal processing circuit 2
Since the output signal of 1 is recorded as a high frequency bias,
Although this gate is not essential, it is desirable to provide this gate so that it will not affect other tracks. The output signal Li of the data selector 36 is
The audio signal processing circuit 21 is controlled to generate the time-axis compressed audio signal Ni at the above timing. Next, the frequency division ratios N ₁ and N _{2 of the} frequency dividers 40 and 38.
Will be described. As described above, since N ₃ = 6, N ₁ × N ₂ ≈19906. To make the phase synchronization system of the capstan motor 45 simplest, N ₄ = N ₅
= 1. In this case, if N ₂ = 1 then the frequency divider 41
The output frequency of is about 180 Hz, which is a value that is easy to make as the FG46. Therefore, N ₁ ≈19906. Next, the case where another audio signal is recorded on the B track of the tape 1 in which the signal has been recorded on the A track will be described. The tape pattern in this case is shown in FIG.
When recording a signal on the B track, if a control signal is applied to the channel select terminal 37, the data selector 36
Outputs the signal L ₂ shown in FIG. Therefore,
Signals are recorded in the B1 track in the period of -b, in the B2 track in the period of c-h, in the B3 track in the period of i-n ..., And the tape pattern as shown in FIG. 5 is formed. The pilot signal recorded on the B1 track should be the frequency f1 or f3 for the above-mentioned reason, and is the frequency f1 in P2 of FIG.
Therefore, the pilot signal f1 is applied to the B1 track.
Pilot signals f2, f3, f4, f1, f2, and f3 are recorded on tracks B2, B3, B4, B5, B6, and B7, respectively. In FIG. 5, the A1 and B1 tracks are displaced by about half the track pitch. Since the A track and the B track are recorded separately, it is not possible to control the relative positions of the A1 track and the B1 track. In some cases, as shown in FIG.
One track and B1 track may be aligned on the same straight line. However, when reproducing the tape 1 as shown in FIG.
It is rare to reproduce the A track and the B track at the same time, and the deviation between the A1 track and the B1 track is not a problem. That is, when reproducing only the A track, the pilot signal may be reproduced and tracked only during the period when the rotary heads 23a and 23b trace the A track. In this way, tracking is not disturbed by signals written on tracks other than the A track. After all,
In order to reproduce the tape pattern of FIG. 5, it is a necessary condition that the tracking control signal (that is, pilot signal) dedicated to the A track is recorded in the A track. When the A1 track and the B1 track are arranged on the same straight line, when the B track is recorded, the capstan servo system is set to the reproduction mode, and the B1 and B1 tracks are tracked by the pilot signal of the A track.
2, ... Tracks need to be recorded. Alternatively, the option track 9 can be used simultaneously with the recording of the A track.
It is also conceivable to record the control pulse on the. B
To record a track, the capstan servo system is set to the reproduction mode. That is, in FIG. 1, the control pulse (reproduction signal from the option track 9) is applied as an input to the phase comparator 43 instead of the output signal from the frequency divider 41. As described above, according to the present invention,
Both the recording of a video signal and the recording of a high-fidelity audio signal can be realized by adding a few circuits to the conventional video tape recorder. Especially, the recording capability of audio signals will be the same as that of audio compact cassettes, and will record ultra-high-fidelity stereo signals for 10 hours or more.
With a recording time that is 10 times longer than that of conventional compact cassettes, it is possible to obtain better sound quality characteristics than the compact cassette metal position. The function of a recording apparatus having the same characteristics as those of the conventional high-efficiency and ultra-high-fidelity recording apparatus can be provided in one device. Needless to say, the present invention is of great value as a recording-only device for recording / reproducing a plurality of types of audio information.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention. FIG. 2 is a waveform diagram showing signals of respective parts in FIG. FIG. 3 is a diagram showing tracks defined in one recording mode in the embodiment shown in FIG. FIG. 4 is a diagram showing a tape pattern on an A track in FIG. FIG. 5 is a diagram showing a tape pattern when B track is recorded after recording on A track in FIG. 3; FIG. 6 is a diagram showing a tape pattern of a conventional home video tape recorder. FIG. 7 is a diagram showing a tape pattern of 8 mm video standard. [Description of Reference Signs] 1 Magnetic tape 10-16 Divided diagonal track 17 Video signal input terminal 19 Switch 21 Audio processor 22a, 22b Audio signal input terminal 23a, 23b Rotary head 28 Pilot signal generator

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04N 5/92 J

Claims (1)

[Claims] 1. In a magnetic recording / reproducing apparatus having a rotary head for tracing a magnetic tape diagonally and sequentially, a selection means capable of selecting a first recording mode and a second recording mode is provided, and the first recording mode is The entire range traced by the rotary head on the tape is divided into first and second sections in the width direction of the magnetic tape, and a video signal is obtained every time the rotary head traces the first section. Means for generating a first desired information signal for each period during which the rotary head traces the second section; and for each period during which the rotary head traces the first section. Second means for generating a tracking control signal assigned to the first section, and generating a tracking control signal assigned to the second section every time the rotary head traces the second section. And the first The video signal from the means, and the tracking control signal from the desired information signals and the second means of said first multiplexed by the third means for supplying to the rotary head,
The multiplexed signal of the video signal and said tracking control signal recorded in the first section, to the second section in a mode of recording the multiplexed signal between the desired information signal and the tracking control signal of the first Then, in the second recording mode, the entire range traced by the rotary head on the magnetic tape is divided into a plurality of sections in the width direction of the magnetic tape, and any section can be designated. A fourth means, a fifth means for sequentially generating a second desired information signal only in each period in which the rotary head traces a section designated by the fourth means, and a fifth means for the fifth means. Sixth means for generating a tracking control signal assigned to the designated section together with the generation of the second desired information signal, the second desired information signal from the fifth means, and the second desired information signal from the fifth means. The tracking control signal from the means of 6 And a seventh means for supplying the rotary head to the rotary head, and a recording mode in which a multiplexed signal of the second desired information signal and the tracking control signal can be recorded in any designated section. Characteristic magnetic recording / reproducing device. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the first and second desired information signals are time-compressed audio signals.