JP3077480B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a method for easily switching and reproducing (2N-1) (where N is a natural number of 2 or more) programs, In the fast forward playback mode or the slow playback mode, (2N-
1) The present invention relates to a magnetic recording / reproducing apparatus capable of displaying and displaying the contents of individual programs on the same screen.

[0002]

2. Description of the Related Art A rotating drum provided with a pair of rotating magnetic heads having opposite azimuth angles at 180-degree symmetric positions is rotated at a predetermined number of revolutions, and the peripheral surface of the drum is rotated. A pair of rotating magnetic heads is used to move the magnetic tape running at a predetermined running speed V in a state where the position of the reference edge of the magnetic tape wound obliquely on at least a part thereof is regulated by a guide provided on the drum. When the helical scan is sequentially and alternately performed according to the rotation of the rotary magnetic heads of the pair of rotary magnetic heads at every 180 degrees, the video signals of the video signal to be recorded are sequentially generated in one field period. 2. Description of the Related Art Magnetic recording / reproducing apparatuses configured to sequentially form recording marks sequentially on a magnetic tape in a state of being adjacent to each other have been widely used.

FIG. 9 shows a recording trace pattern on a magnetic tape T when a plurality of programs are sequentially recorded on the magnetic tape T on the time axis using the magnetic recording / reproducing apparatus having the above configuration. ., A2o, A3o..., B1 in the magnetic tape T in FIG.
o, B2e, B3o ..., drawing symbols C1o, C2e, C3o ...
The frames marked with indicate the recording traces of the video signal in one field period, respectively. A, B, C, etc. in the above-mentioned drawing symbols are English characters for indicating the distinction between the program names recorded on the magnetic tape T, and the numerical subscripts 1, 2,. In addition, the subscripts o and e of the English characters are for distinguishing between odd-numbered fields and even-numbered fields.

[0004]

The most common recording format when a plurality of programs are recorded on a magnetic tape T by a conventional magnetic recording / reproducing apparatus can be seen from the state of a recording trace pattern in FIG. As described above, in the conventional magnetic recording / reproducing apparatus, when a specific program is selected and reproduced from the recorded magnetic tape T on which a plurality of programs are recorded, the first part of the specific program is recorded. In order to start playback from the portion where the magnetic tape T is played back, it is necessary to fast forward or rewind the magnetic tape T to perform cueing. Therefore, a specific program is selected from a plurality of programs within a short time. It was difficult to do so, and of course, it was not possible to confirm the contents of a plurality of programs in a short time.
The above problem is widely known as a problem when recording and reproducing information signals using a tape-shaped recording medium. In recent years, images of a plurality of programs have been projected on the image plane of one display. However, as described above, a plurality of images recorded on the magnetic tape T are recorded. If it is difficult to select a specific program from among the programs in a short time, it is not possible to project images of a plurality of programs on the image plane of one display. Therefore, there has been a demand for a magnetic recording / reproducing apparatus which can solve the above problems.

[0005]

According to the present invention, a rotating drum provided with a pair of rotating magnetic heads having opposite azimuth angles at 180-degree symmetric positions is rotated at a predetermined rotational speed. The magnetic tape running at a predetermined running speed V while being wound around a part of the peripheral surface of the rotary drum is
One successive field period in the video signal to be recorded corresponds to the rotation of each rotary magnetic head of the pair of rotary magnetic heads at every 180 degrees when the helical scan is sequentially and alternately performed by the pair of rotary magnetic heads. (2N-1) (where N is 2 or more) which are to be recorded / reproduced in a magnetic recording / reproducing apparatus in which sequential recording traces by the video signal are sequentially formed adjacent to each other on a magnetic tape. ), The recording traces of the individual programs in the program of (2N-) are recorded in a fixed repetition order.
1) A recorded magnetic tape which is arranged for each recording trace and in which the recording trace by the video signal in the odd field period and the recording trace by the video signal in the even field period are formed adjacent to each other, (2N-1) + M｝ V
[Where M is 0 and {− (2N−1)} and {−
2 (an integer other than (2N-1)}), a means for matching the recording trace on the recorded magnetic tape with the rotation locus of the rotary magnetic head, and the recorded magnetic tape. At least process the video signals sequentially reproduced from the rotating magnetic head so that the images of the (2N-1) programs recorded in the rotary magnetic head can be displayed in a predetermined arrangement state on one display screen. A magnetic recording / reproducing apparatus comprising: a signal processing unit including a memory.

[0006]

A rotating drum provided with a pair of rotating magnetic heads having opposite azimuth angles at 180-degree symmetric positions is rotated at a predetermined number of revolutions, and one of the peripheral surfaces of the rotating drum is rotated. When the magnetic tape running at a predetermined running speed V while being wound around the portion is sequentially and alternately helically scanned by the pair of rotary magnetic heads, each rotary magnetic head of the pair of rotary magnetic heads is used. Corresponding to the rotation of every 180 degrees in the video signal to be recorded.
In the state where the magnetic tape is run at a predetermined running speed V in a magnetic recording / reproducing apparatus in a recording mode, a sequential recording mark by a video signal in a field period is sequentially formed adjacent to the magnetic tape. A control signal is recorded on a control track at the edge of the magnetic tape, and information for identifying recording marks formed sequentially on the magnetic tape is recorded on, for example, an audio track at the edge of the magnetic tape.

A magnetic tape on which the above-mentioned control signal and information for sequentially identifying recording marks are recorded at a traveling speed of (2N-1) V (where N is a natural number of 2 or more). In this state, the recording trace by the video signal of one specific program in the (2N-1) programs to be recorded and reproduced is recorded by the video signal of the program on the magnetic tape. Figure 6 in place
(A). The recording position of the recording trace by the video signal of one specific program in the (2N-1) programs to be recorded and reproduced is the control signal and the information for sequentially identifying the recording trace. Is determined correctly using

Next, the magnetic tape on which the recording trace of the video signal of one specific program in the (2N-1) programs to be recorded and reproduced as described above is recorded is referred to as (2N- 1) While being run at a running speed of V (where N is a natural number of 2 or more), the above-mentioned recording and reproduction recorded on the magnetic tape is performed (2N-1).
Adjacent to the recording trace by the video signal of one specific program in the plurality of programs so that the video signal recorded in the adjacent recording trace is a video signal in an odd field period and a video signal in an even field period. , Described above (2N-
1) A recording trace of another specific program in one program by a video signal is recorded as illustrated in FIG. 6B. Hereinafter, similarly, the recording trace of each specific one program in the (2N-1) programs by the video signal is
(2N-1) V (where N is a natural number of 2 or more) A video recorded adjacent to a recording mark recorded on a magnetic tape in a state of running at a running speed and recorded in an adjacent recording mark. The signals are recorded as illustrated in FIG. 6C so that the signals become the video signal in the odd field period and the video signal in the even field period.

As described above, the recording trace pattern on the recorded magnetic tape T on which (2N-1) programs are recorded as described above is, for example, as shown in FIG. Records in a certain repetition order (2
(N-1) In a state where the recording traces by the video signal in the odd-numbered field period and the recording traces by the video signal in the even-numbered field period are recorded adjacent to each other (2N-1) The recording trace by the video signal of the) programs is recorded on the magnetic tape.

For example, as illustrated in FIG.
When a recorded magnetic tape on which recording traces by video signals of (2N-1) programs are recorded is run at a running speed of (2N-1) V, 180 degrees on a rotating drum rotated at a predetermined number of revolutions is obtained. A pair of rotating magnetic heads having opposite azimuth angles at degrees symmetrical positions sequentially scan recording traces by video signals of one of (2N-1) programs. (2N-1) using the control signal recorded on the completed magnetic tape and the information for sequentially identifying the recorded traces.
By scanning the recording trace of the video signal of one specific program which is to be reproduced among the plurality of programs with the rotary magnetic head, the video signal can be reproduced from the recording trace. .

For example, as shown in FIG. 5, a recorded magnetic tape on which recording traces by video signals of (2N-1) programs are recorded is represented by {(2N-1) +
M｝ V (where M is an integer other than 0 and {− (2N−1)} and {−2 (2N−1)}], and the rotation locus of the rotating magnetic head described above; For example, the rotating magnetic head is driven and displaced by an actuator, or the running path of the recorded magnetic tape is changed so that the recording mark to be scanned on the recorded magnetic tape coincides with the recorded mark. Thus, from the rotating magnetic head, a video signal skipping {(2N-1) + M} fields can be reproduced at a (2N-1) field period for all (2N-1) programs. The video signal of each program of {(2N-1) + M} fields obtained in the (2N-1) field period as described above is converted from analog to digital and stored in a memory as a digital signal. By reading out the video signal data of each program in the (2N-1) programs stored in the memory in a predetermined order, the images of the (2N-1) programs are displayed on a single display screen in a predetermined manner. After generating a digital signal of a video signal that can be displayed in the arrangement state, the digital signal is converted from digital to analog and output.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to the present invention. FIG. 1 is a block diagram showing a schematic configuration of the magnetic recording / reproducing apparatus of the present invention, FIGS. 2 to 4 are time charts for explaining the operation, and FIGS. 5 and 6 are for explaining the operation of the magnetic recording / reproducing apparatus of the present invention. FIG. 7 and FIG. 8 are diagrams for explaining an operation example during reproduction in the magnetic recording / reproducing apparatus of the present invention. In the block diagram of FIG. 1 showing a schematic configuration of the magnetic recording / reproducing apparatus of the present invention, 1 is an input terminal of a signal to be recorded, 2 and 3 are output terminals of a reproduced signal, and 25
Is an input terminal for a program selection instruction signal. In the drawing, T is a magnetic tape, and this magnetic tape T is wound around a part of the peripheral surface of a lower drum Dd and a rotating drum (upper drum) Du, depending on the operation mode of the magnetic recording / reproducing apparatus. The vehicle is driven at a predetermined speed in a predetermined direction. The above-described running of the magnetic tape T is performed by rotating the magnetic tape T held between the capstan 28 rotated by the capstan motor Mc and a pinch roller (not shown) by driving the capstan motor Mc. What is done is well known.

Ha and Hb are rotating magnetic heads having opposite azimuth angles provided in pairs at 180-degree symmetric positions on the rotating drum Du, and the two rotating magnetic heads Ha and Hb described above are The video signal for one field period is recorded on the magnetic tape T or reproduced from the magnetic tape T by one of the rotary magnetic heads alternately and sequentially every half rotation of the rotary drum Du. Rotating magnetic head H
a, Hb is mounted on the rotating drum Du,
Drum motor Md → Rotation phase detector 5 → Phase comparator 7 →
The amplifier 8 is driven and rotated by the drum motor Md which rotates at a predetermined rotation phase by the reference signal supplied to the phase comparator 7 in the automatic control system of one cycle of the drum motor Md. In FIG. 1, the description of the speed control circuit of the drum motor Md is omitted (this point is not described.
The same applies to a capstan motor Mc described later.) The magnetic head 27 shown on the lower edge side of the magnetic tape T in FIG. 1 is a control head, and the magnetic head 26 shown on the upper edge side of the magnetic tape T is an audio head. Reference numeral 6 denotes a rotation phase detector that performs an operation of detecting the rotation phase of the capstan from a signal generation pattern attached to the rotation shaft of the capstan motor Mc.

The patterns of the recording marks recorded on the magnetic tape T by the rotary magnetic heads Ha and Hb are based on the relative linear velocities between the rotary magnetic heads Ha and Hb and the magnetic tape T and the rotational magnetic head. It is determined by the angle between the surface of the rotation locus and the reference edge of the magnetic tape. For example, if the running speed of the magnetic tape during the recording operation is different from the running speed of the magnetic tape during the reproducing operation, the magnetic tape T It is well known that the rotating magnetic head during the reproducing operation cannot properly track the recording trace formed on the recording head. As will be described later, in the magnetic recording / reproducing apparatus of the present invention, in addition to the reproducing operation in the reproducing mode in which the reproducing operation is performed by setting the traveling speed of the magnetic tape T to be the same as the traveling speed of the magnetic tape T during the recording operation, The reproducing operation in the reproducing mode in which the reproducing operation is performed by making the traveling speed of the tape T different from the traveling speed of the magnetic tape T at the time of the recording operation is also performed. Even during a reproducing operation in which the traveling speed of T is different from the traveling speed of the magnetic tape T during the recording operation, the rotating magnetic head can satisfactorily track the recording trace to be tracked on the magnetic tape T. The configuration is as follows.

As described above, even during a reproducing operation in which the running speed of the magnetic tape T during the reproducing operation is different from the running speed of the magnetic tape T during the recording operation, the rotating magnetic head is not subject to tracking by the magnetic tape T. As a configuration that allows good tracking of recorded traces,
For example, the rotary magnetic head is driven and displaced by an actuator (which may be of any configuration of an electrodynamic type, a piezoelectric type, or an electromagnetic type) provided in an automatic tracking control system, and the rotary magnetic head is tracked to a recording mark. (See, for example, JP-A-5-110973),
By changing the inclination of the drum in accordance with the running speed of the magnetic tape and relatively changing the running direction of the magnetic tape and the direction of the rotational trajectory surface of the rotating magnetic head, the rotating magnetic head can be used as a recording mark. Be tracked (for example,
(See Japanese Patent Application No. 5-75252), the height of the guide roller of the magnetic tape provided on the entrance side or the exit side to the drum corresponding to the traveling speed of the magnetic tape corresponds to the traveling speed of the magnetic tape. To change the running direction of the magnetic tape and the direction of the rotational trajectory surface of the rotating magnetic head, thereby causing the rotating magnetic head to follow the recording trace (for example, Japanese Patent Application No. 5-225128
The guide roller of the magnetic tape provided on the entrance side and the exit side to the drum corresponding to the traveling speed of the magnetic tape while changing the inclination of the drum in accordance with the traveling speed of the magnetic tape The height of the magnetic head is changed in accordance with the running speed of the magnetic tape, and the running direction of the magnetic tape and the direction of the rotational trajectory surface of the rotating magnetic head are relatively changed, so that the rotating magnetic head can be used as a recording mark. A configuration may be adopted in which means such as tracking (for example, see Japanese Patent Application No. 5-75252 and Japanese Patent Application No. 5-93593) is applied.

The magnetic recording / reproducing apparatus shown in FIG. 1 includes a rotating drum Du provided with a pair of rotating magnetic heads Ha and Hb having opposite azimuth angles at 180-degree symmetric positions. When rotating at a predetermined rotation speed, the magnetic tape T wound around a part of the peripheral surface of the rotating drum Du and the lower drum Dd is run at a predetermined running speed V. In correspondence with the rotation of each rotary magnetic head of the pair of rotary magnetic heads Ha and Hb at every 180 degrees, a sequential recording trace by a video signal of one sequential field period in a video signal to be recorded is shown in FIG. Although the recording trace pattern as described above is originally provided with a configuration that can be sequentially formed on the magnetic tape T in a state of being adjacent to the magnetic tape T, in the present invention, the recording tape pattern of the magnetic tape T during the recording operation is provided. The line speed, (2N-1) V (However,
N is a natural number of 2 or more).
In the (2N-1) programs to be recorded / reproduced, the recording traces by the video signal of each program are arranged for every (2N-1) recording traces in a constant repetition order. The video signals of the (2N-1) programs are recorded so that the recording trace of the video signal in the odd field period and the recording trace of the video signal in the even field period are adjacent to each other, as shown in FIG. The recording operation is performed so as to obtain a recorded magnetic tape having a recorded trace pattern as described above.

Also, a recorded magnetic tape having a recording trace pattern as illustrated in FIG.
-1) Run at a running speed of V, and select a recording trace by a video signal of a specific one of the (2N-1) programs recorded on the recorded magnetic tape T. As described later in detail with reference to FIGS. 7 and 8, a recorded magnetic tape having a recording trace pattern as illustrated in FIG. , {(2N-1) + M}
V [where N is a natural number of 2 or more, M is 0 and ｛− (2
N-1)} and an integer other than {-2 (2N-1)}]
再生 (2N−1) field cycle for each program,
-1) By processing the video signal of + M｝ fields, the images of (2N-1) programs recorded on the recorded magnetic tape are arranged in a predetermined arrangement on one display screen. The reproduction operation for displaying the state is also performed.

An input terminal 1 of a recording / reproducing signal processing circuit 4 shown in FIG. 1 is provided with a signal to be recorded / reproduced by a magnetic recording / reproducing apparatus, for example, a chrominance signal in a luminance signal band. Is supplied with a broadband composite color video signal (for example, a wideband signal in the form of a composite color video signal of the NTSC system) in a state where is mixed with a luminance signal. The wideband composite color video signal supplied to the input terminal 1 of the recording / reproducing signal processing circuit 4 is separated into a luminance signal Y and a carrier chrominance signal C by a YC separation circuit in the recording / reproducing signal processing circuit 4, and then a luminance signal is output. The signal Y is converted into a frequency modulated wave signal by a luminance signal by a frequency modulator, and the carrier chrominance signal C output from the YC separation circuit is converted into a low-frequency conversion carrier chrominance signal by a chrominance signal processing circuit. The recording signal in the form of a frequency multiplexed signal in which the frequency modulated wave signal by the luminance signal and the low-frequency conversion carrier color signal are mixed is supplied to a video signal recording / reproducing switch after being amplified by a recording amplifier. The above-mentioned video signal recording / playback switch,
When the magnetic recording / reproducing apparatus is in the recording operation mode, the recording signal in the form of the frequency multiplexed signal is transmitted to the rotating magnetic head H
a, Hb.

When the magnetic recording / reproducing apparatus is in the reproducing operation mode, a reproduced signal in the form of a frequency multiplexed signal reproduced from the magnetic tape T by the rotary magnetic heads Ha, Hb is:
A reproduction signal supplied to a reproduction amplifier in the recording / reproduction signal processing circuit 4 and amplified by the reproduction amplifier, that is, a reproduction signal in the form of a frequency multiplexed signal of a low-frequency converted carrier chrominance signal and a frequency modulated wave signal based on a luminance signal. Is separated into a frequency modulated wave signal by a luminance signal and a low-frequency conversion carrier chrominance signal by a high-pass filter and a low-pass filter, and the frequency modulated wave signal by the luminance signal is a frequency demodulator. , And is converted into a luminance signal Y, and the low-frequency-converted carrier color signal is converted into a carrier color signal by a color signal processing circuit. The luminance signal and the carrier chrominance signal are mixed by a mixer to form a composite color video signal in a state where the chrominance signal is band-multiplexed with the luminance signal in the luminance signal band. Output to The recording / reproducing signal processing circuit 4 performs color demodulation to generate color difference signals (RY) and (BY), and generates a luminance signal Y and the color difference signal (RY).
(BY) signal to the analog-to-digital converter 21 of the signal processing circuit 19.

The analog-to-digital converter 21 in the signal processing circuit 19 converts the luminance signal Y and the color difference signals (RY) and (BY) supplied thereto into digital signals. Control circuit 24 for digital signal
Is stored in the memory 22 under the control of. The digital signal stored in the memory 22 is read out under the control of the control circuit 24, then converted into an analog signal by the digital / analog converter 23, and supplied to the encoder 20. In the encoder 20, a luminance signal and a color difference signal (R
Based on the (Y) signal and the (BY) signal, a composite color video signal in which the color signal is band-multiplexed with the luminance signal in the band of the luminance signal is generated and transmitted to the output terminal 3.
As described above, the analog-to-digital converter 21, the memory 22, and the digital-to-analog converter 2 in the signal processing circuit 19 are used.
The signal processing performed on the video signal using
In the magnetic recording / reproducing apparatus of the present invention, the magnetic tape is
(N-1) V (where N is a natural number of 2 or more), which is a target of recording / reproducing while traveling.
The recording traces by the video signal of each program in the (N-1) programs are arranged for every (2N-1) recording traces in a fixed repetition order, and are recorded by the video signal in the odd field period. The recorded magnetic tape on which the video signals of the (2N-1) programs are recorded in a state where the trace and the recording trace by the video signal in the even-numbered field period are adjacent to each other is denoted by {(2N- 1) + M｝ V [where N is a natural number of 2 or more, M is 0 and ｛− (2N−
1) {and an integer other than {-2 (2N-1)}], and playback is performed, and {(2N-1) obtained for each program in a (2N-1) field period.
+ M｝ Performs signal processing on the video signal skipped by the field,
The data recorded on the recorded magnetic tape (2N-
1) It is used, for example, when generating a video signal for displaying images of one program in a predetermined arrangement state on one display screen.

In the magnetic recording / reproducing apparatus shown in FIG. 1, recording traces by video signals are sequentially formed on the magnetic tape T so as to have the recording trace pattern as described with reference to FIG. In this case, the rotating drum Du provided with a pair of rotating magnetic heads Ha and Hb having opposite azimuth angles at 180-degree symmetric positions is rotated at a predetermined rotation number, and the rotation is performed. Magnetic tape T wound around a part of the peripheral surface of the drum Du and the lower drum Dd
Is run at a predetermined running speed V, and 18 of each of the pair of rotating magnetic heads Ha and Hb is rotated.
It is sufficient to form a sequential recording trace of the video signal to be recorded by the video signal of one sequential field period on the magnetic tape T corresponding to the rotation every 0 degree.

At the time of the recording operation described above, a control signal generated by the control signal generator 18 is supplied to the control head 27 via the fixed contact b and the movable contact v of the changeover switch 14, and the control head 27
As a result, a control signal is recorded on the control track of the magnetic tape T. The control of the running system of the magnetic tape T during the recording operation is generated by the rotation phase detector 6 which performs the operation of detecting the rotation phase of the capstan from the signal generation pattern attached to the rotation shaft of the capstan motor Mc. The phase comparator 1 in which the rotation phase signal is supplied via the fixed contact b and the movable contact v of the changeover switch 12.
1, the reference signal generated by the reference signal generator 9 is supplied via the fixed contact R and the movable contact v of the changeover switch 10, whereby the phase comparator 11 → the amplifier 13 →
Capstan motor Mc → rotation phase detector 6 → fixed contact b and movable contact v of changeover switch 12 → phase comparator 11
The control is performed such that the error signal from is controlled to be zero.

When the magnetic recording / reproducing apparatus shown in FIG. 1 reproduces a magnetic tape T having a recording trace pattern as described above with reference to FIG. Rotating magnetic head H forming a pair with an angle
a and Hb are rotated at a predetermined number of rotations, and the magnetic tape T wound around a part of the peripheral surface of the rotation drum Du and the lower drum Dd is fixed at a predetermined rotation speed. The vehicle is driven at the running speed V, and the rotation of the pair of rotary magnetic heads Ha and Hb corresponds to the rotation of each rotary magnetic head every 180 degrees. The recording signals in the sequential recording tracks are reproduced from the magnetic tape. The control of the running system of the magnetic tape T during the reproducing operation is performed by controlling the control signal reproduced by the control head 27 from the control track of the magnetic tape T by using the movable contact v and the fixed contact c of the changeover switch 14 and the control signal discriminator 15. The phase comparator 11 via the fixed contact c of the changeover switch 12
At the same time, the reference signal generated by the reference signal generator 9 is applied to the fixed contact P and the movable contact v of the changeover switch 10.
And the above-mentioned phase comparator 1
1 → amplifier 13 → capstan motor Mc → magnetic tape T → control head 27 → movable contact v and fixed contact c of switch 14 → control signal discriminator 15 → fixed contact c and movable contact v of switch 12 → phase comparison This is performed by controlling the error signal from the phase comparator 11 to be zero by a single-cycle automatic control system such as the device 11.

Next, the magnetic tape T at the time of the recording operation is changed to (2) by the magnetic recording / reproducing apparatus shown in FIG.
(N-1) V (where N is a natural number of 2 or more), which is a target of recording / reproducing while traveling.
The recording traces of the N-1) programs by the video signal of each program are recorded in (2N-1) recording traces in a fixed repetition order, for example, as in a recording trace pattern illustrated in FIG. The following describes a case where recording is performed such that recording traces by video signals in odd field periods and recording traces by video signals in even field periods are adjacent to each other. Note that the running speed V of the magnetic tape T is, as described above, the magnetic recording / reproducing apparatus shown in FIG.
In accordance with the rotation of each rotary magnetic head of the pair of rotary magnetic heads Ha and Hb at every 180 degrees, a sequential recording trace is formed on the magnetic tape T by a video signal of one sequential field period in a video signal to be recorded. This is the running speed of the magnetic tape.

In the magnetic recording / reproducing apparatus shown in FIG. 1, for example, like the recording trace patterns illustrated in FIG. 5, each of the (2N-1) recording traces is arranged in a constant repetition order. At the same time, when recording the video signals of (2N-1) programs on the magnetic tape T in such a recording mode that the recording trace by the video signal in the odd field period and the recording trace by the video signal in the even field period are adjacent to each other. It is necessary that the recording traces by the video signals of the (2N-1) programs recorded on the magnetic tape T be correctly recorded in the sequential recording area scheduled on the magnetic tape T. ,Also,
If the recording traces of the (2N-1) programs recorded on the magnetic tape T by the video signals can be distinguished at the time of reproduction from the recording traces by the video signals of the programs, a plurality of programs can be discriminated. It is also possible to instantly select and play a desired program from among them.

When recording traces of video signals of (2N-1) programs are sequentially recorded and formed on the magnetic tape T, for example, a control signal or a program identification signal is transmitted to the magnetic tape T. Since it is preferable to record the track identification signal, for example, before the recording traces by the video signals of the (2N-1) programs are sequentially recorded and formed on the magnetic tape T, the magnetic tape T is moved at the running speed V. In a state in which the control tape 27 is running, a control signal is recorded on a control track of the magnetic tape T by the control head 27, and a track identification signal is recorded by an audio head 26 on an audio track of the magnetic tape T.
The recording operation of the control signal and the recording operation of the track identification signal on the magnetic tape T are performed by switching the movable contact v of the changeover switch 10 to the fixed contact R side and changing the movable contact v of the changeover switches 12, 14, 16. Is switched to the fixed contact b side, and the magnetic tape T is run at the running speed V.

In a state where the movable contacts v of the changeover switches 10, 12, 14, and 16 are switched to the above-described switching mode, the control of the traveling system of the magnetic tape T traveling at the traveling speed V is performed by the cap. A rotation phase detector 6 that performs an operation of detecting the rotation phase of the capstan from a signal generation pattern attached to the rotation shaft of the stun motor Mc.
Is supplied to the phase comparator 11 via the fixed contact b and the movable contact v of the changeover switch 12, and at the same time, the reference signal generated by the reference signal generator 9 is It is supplied via the fixed contact R and the movable contact v, and is supplied with the phase comparator 11 → the amplifier 13 → the capstan motor Mc → the rotational phase detector 6 → the fixed contact b and the movable contact v of the changeover switch 12 → the phase comparator 11 This is performed by controlling the error signal from the phase comparator 11 to be zero by a one-time automatic control system having the above configuration.

The control signal generated by the control signal generator 18 is transmitted to the control signal generator 18.
→ Fixed contact b and movable contact v of the changeover switch 14 → Tracks supplied to the control head 27 by the circuit of the control head 27 and recorded on the control track of the magnetic tape T, and generated by the track identification signal generator 17 The identification signal is a track identification signal generator 1
7 → the fixed contact “b” of the changeover switch 16 and the movable contact “v” → supplied to the audio head 26 by the circuit of the audio head 26 and recorded on the audio track of the magnetic tape T. FIG. 2 exemplifies a frame discrimination pulse {(a)} of FIG. 2, a control signal {(b)} of FIG. 2, and a track identification signal {(c)} of FIG.

The control signal recorded on the control track of the magnetic tape T is assumed to be a pulse of the frame period in the following description, and the recording trace of the recording of the video signal of the odd field period and the video of the even field period are recorded. One control pulse is recorded for every two successive recording traces on the magnetic tape T on which the recording traces in which the signals are recorded are sequentially recorded. The track identification signal recorded on the audio track of the magnetic tape T by the audio head 26 is shown as data indicating the contents of the program in FIGS. 2 to 4, but is recorded and formed on the tape. A pulse may be recorded as a track identification signal only at a position corresponding to a recording trace of a specific program in a recording trace group by a video signal of a different program, or a pulse width modulation of the control signal may be performed. Then, the track identification signal may be recorded on the magnetic tape T.

As described above, the magnetic tape T on which the control signal and the track identification signal have been recorded in advance is rewound, and the magnetic tape T is fixed to each other, for example, as shown in the recording trace pattern illustrated in FIG. In a repetition order of (2N-1) recording traces, and in such a recording mode that the recording trace by the video signal in the odd field period is adjacent to the recording trace by the video signal in the even field period ( When recording the video signals of 2N-1) programs on the magnetic tape T, the movable contact v of the changeover switch 10 is switched to the fixed contact P side, and the changeover switch 1
The magnetic tape T is run at a running speed of (2N-1) V in a state where the movable contacts v in 2, 14, and 16 are switched to the fixed contact c side.

Further, two rotating magnetic heads H provided in pairs at 180-degree symmetric positions on the rotating drum Du are provided.
a and Hb sequentially and alternately record the video signal for one field period on the magnetic tape T by one rotating magnetic head for each half rotation of the rotating drum Du. The rotating magnetic heads Ha and Hb are attached. The rotating drum Du rotates by a predetermined amount according to a reference signal supplied to the phase comparator 7 in the automatic control system of one cycle of the drum motor Md → the rotational position detector 5 → the phase comparator 7 → the amplifier 8 → the drum motor Md. It is driven and rotated by a drum motor Md that rotates in phase. In the above state, the track identification signal reproduced by the audio head 26 is illustrated in FIG. 3A. The track identification signal is controlled via the movable contact v and the fixed contact c of the changeover switch 16. The control signal supplied to the signal discriminator 15 and reproduced by the control head 27 (FIG. 3 (b)) shows a differential waveform of the control signal reproduced from the magnetic tape T by the control head 27. ｝ Is also supplied to the control signal discriminator 15 via the movable contact v and the fixed contact c of the changeover switch 14.

Therefore, the control signal discriminator 1
5, the rising portion of the control signal corresponding to the identification signal indicating the program to be recorded on the magnetic tape T first among the video signals of the (2N-1) programs to be recorded from now on. , The original control signal is frequency-divided by (2N-1) by adding the falling pulse positioned at a predetermined ratio at the same time as extracting the program control instruction signal supplied via the terminal 25. The control signal is generated as shown in FIG. 3 (c).
The example shown in FIG. 3 shows a case where the (2N-1) frequency division is a frequency division by three.
, Via the fixed contact c and the movable contact v of the changeover switch 12. On the other hand, a reference signal having a frame period synchronized with the video signal to be recorded is supplied from the reference signal generator 9 to the phase comparator 11 via the fixed contact R and the movable contact v of the changeover switch 10. Therefore, the capstan motor Mc is connected to the phase comparator 11 → the amplifier 13 → the capstan motor Mc → the magnetic tape T → the control head 27 → the movable contact v and the fixed contact c of the changeover switch 14 →
The control signal discriminator 15 → the fixed contact c and the movable contact v of the changeover switch 12 → the driving and rotation of the phase comparator 11 are performed by a one-cycle automatic control system such that the error signal from the phase comparator 11 becomes zero. The magnetic tape T runs at a running speed of (2N-1) V (3 times speed in the example of FIG. 3) in a state where the video signal is recorded at a position corresponding to the designated control signal.

Then, of the video signals of the (2N-1) programs, the recording signal based on the video signal of the program to be recorded on the magnetic tape T first is sent from the recording / reproducing signal processing circuit 4 to the rotating magnetic head. By supplying the signals to Ha and Hb and recording them on the magnetic tape T, the recording trace of the program to be recorded on the magnetic tape T by the video signal of the program to be recorded first is illustrated in FIG. It is recorded and formed as follows. As described above, when the recording trace by the video signal of the program to be recorded on the magnetic tape T is completed as shown in FIG. 6A, the control signal discriminator is then turned on. 15 to a program selection instruction signal that uses a control signal corresponding to the position where the second program is to be recorded, via the terminal 25, and the video signal is transmitted to the position corresponding to the specified control signal on the magnetic tape T. (2N)
-1) A recording signal based on the video signal of the program which is to be recorded on the magnetic tape T second among the video signals of the (2N-1) programs which are run at the running speed of V, and The data is supplied from the processing circuit 4 to the rotating magnetic heads Ha and Hb and recorded on the magnetic tape T, whereby the magnetic tape T
Is the second to be recorded on the magnetic tape T 2
The recording trace of the video signal of the third program is recorded and formed as illustrated in FIG. 6B.

Of the video signals of the (2N-1) programs,
Secondly, when the recording trace by the video signal of the program to be recorded on the magnetic tape T is completed as shown in FIG. 6B, the terminal 25 is connected to the control signal discriminator 15. A program selection instruction signal that uses a control signal corresponding to the position where the third program is to be recorded is given through the magnetic tape T so that the video signal is recorded at the position corresponding to the specified control signal. In this state, the vehicle travels at a traveling speed of (2N-1) V,
Of the video signals of the (2N-1) programs, the recording signal based on the video signal of the program to be recorded on the magnetic tape T third from the recording / reproducing signal processing circuit 4 to the rotating magnetic heads Ha and Hb. By supplying and recording on the magnetic tape T, the recording trace by the video signal of the program to be recorded on the magnetic tape T first is recorded on the magnetic tape T as illustrated in FIG. It is formed. In this way, the recordings of all the video signals of the (2N-1) programs to be recorded are recorded on the magnetic tape T.
It is recorded and formed. The recorded trace pattern on the recorded magnetic tape T on which the (2N-1) programs to be recorded are recorded is, for example, as shown in FIG.
As shown in the figure, the recording traces by the video signal of one specific program are arranged for every (2N-1) recording traces in a fixed repetition order, and the recording traces by the video signal in the odd field period are obtained. In a state where the recording trace and the recording trace by the video signal in the even-numbered field period are recorded adjacently (2
The recording trace of the video signal of (N-1) programs is recorded on the magnetic tape.

Next, in the state where the vehicle is run at the running speed of (2N-1) V as described above, as shown in FIG. 5, recording traces by video signals of (2N-1) programs are formed. The recorded magnetic tape recorded is run at a running speed of (2N-1) V, and a pair having opposite azimuth angles is formed at 180-degree symmetric positions on a rotating drum rotated at a predetermined rotation speed. The rotating magnetic heads Ha and Hb form (2N-
1) When the recording traces of one of the programs by the video signal of one of the programs are sequentially scanned, the recording traces are set to be reproduced from the (2N-1) programs to be recorded and reproduced. The reproduction operation from the recording trace by the video signal of one specific program is performed. The selective reproduction of the recording trace by the video signal of one of the (2N-1) programs is performed by the control signal recorded on the recorded magnetic tape and the information for sequentially identifying the recording trace. This is very easily performed by using (see FIG. 4).

Next, with the vehicle running at the traveling speed of (2N-1) V as described above, for example, as shown in FIG. 5, recording traces by video signals of (2N-1) programs Is recorded on the recorded magnetic tape T, a traveling speed different from the traveling speed (2N-1) V of the magnetic tape T during the recording operation {(2N-1) + M)} V [where N is 2 or more. M is 0 and {− (2N−1)} and {−2
(2N-1) An integer other than {}, and the rotation trajectories of the rotary magnetic heads Ha and Hb coincide with the recording traces to be scanned on the recorded magnetic tape T. Thus, for example, the rotating magnetic head H
a and Hb are displaced by an actuator, or the running path of the recorded magnetic tape T is changed, so that the rotary magnetic heads Ha and Hb sequentially display the video signals of (2N-1) programs in the (2N-1) programs. Play the video signal. When the recorded magnetic tape T obtained by performing recording under the conditions described above is run at the above-described tape running speed,
For each program, a video signal having contents of {(2N-1) + M} fields can be obtained regularly at a (2N-1) field period.

In the (2N-1) field cycle of each program obtained regularly as described above, ｛(2
The video signal having the content of (N-1) + M} steps is supplied from the recording / reproducing signal processing circuit 4 to the signal processing circuit 19 in the form of a luminance signal Y and color difference signals RY and BY. The signal processing circuit 19 converts the luminance signal Y and the color difference signals RY and BY supplied thereto into an analog / digital converter 21.
After that, the digital signal is stored in the memory 22.
The luminance signal data and color difference signals RY, B of each program in the (2N-1) programs stored in the memory 22
The -Y data means that the images corresponding to the (2N-1) programs are displayed in a predetermined arrangement state on one display screen, for example, as shown in FIG. After being read from the memory 22 in a predetermined order for conversion into a time-series signal such that the signals can be converted into digital signals, the digital-to-analog converter 23 converts the signals into digital-to-analog signals and supplies them to the encoder 20. The encoder 20 uses the luminance signal Y and the color difference signals RY and BY to generate a composite color video signal in which the luminance signal and the carrier chrominance signal are band-shared and multiplexed, and sends the composite color video signal to the output terminal 3. The signal processing operation in the signal processing circuit 19 is performed under the control of the control circuit 24.

FIGS. 7 and 8 show (2N-1) as described above.
In the state of running at the running speed of V, for example, as shown in FIG. 5, the recorded magnetic tape T on which the recording trace by the video signal of (2N-1) programs is recorded is recorded during the recording operation. (2N-1) + M｝ V [where N is 2
The above natural numbers and M are 0 and an integer other than {-(2N-1)} and {-2 (2N-1)}], and the rotational trajectories of the rotary magnetic heads Ha and Hb, The rotating magnetic head H is adjusted so that the recording mark to be scanned on the recorded magnetic tape T matches.
(2) for each program obtained by playing back a and Hb
The video signal having the content of ((2N-1) + M} fields skipped in the (N-1) field cycle is signal-processed by the signal processing circuit 19, and is recorded on the recorded magnetic tape T (2N-1). FIG. 9 is a diagram for explaining a case in which image contents based on video signals of all of the programs are arranged and displayed on one display screen, and in the examples shown in FIGS. This is an example of the case where the number of programs is nine (N = 5 in the expression of (2N-1)).

In FIGS. 7 and 8, o in o, e, o, e... Described in a square frame indicates a recording trace of a video signal in an odd field period, and e indicates an even field period. Shows the recording trace of the video signal of
The numbers 1, 2, ... 9 shown above the square frame are
It shows the program numbers of nine programs recorded on the recorded magnetic tape. FIG. 7 shows that the recorded magnetic tape on which nine programs are recorded is higher than the running speed 9V of the magnetic tape T when producing the recorded magnetic tape.
Assuming that the vehicle is run on a recorded magnetic tape at a high running speed of 11 V (when M is 2 as described above), the order of the program of the video signal sequentially reproduced on the time axis from the recorded magnetic tape T is as follows. This is an example.

As described above, the recorded magnetic tape on which the nine programs are recorded has a running speed of 11 V (which is higher than the running speed of the magnetic tape T when producing the recorded magnetic tape). In FIG. 7, which shows an example of running on a recorded magnetic tape in the case of 2), the order of programs sequentially reproduced on the time axis from the recorded magnetic tape T is shown in the lower part of FIG. As shown,
Recording trace of odd field period of program 1 → recording trace of even field period of program 3 → recording trace of odd field period of program 5 → recording trace of even field period of program 7 → program 9
Recording trace of the odd field period of program 2 → recording trace of the odd field period of program 4 → recording trace of the even field period of program 6 → recording trace of the odd field period of program 8 → program 1 Recording trace of the odd field period of program 3 → recording trace of the even field period of program 5 → recording trace of the odd field period of program 7 → recording trace of the even field period of program 9 → program 2 Of the odd field period → recording of the even field period of program 4 → recording of the odd field period of program 6 → recording of the even field period of program 8 → recording of the odd field period of program 1 → It becomes repetition.

As is clear from the description given with reference to FIG. 7 in the case of N = 5 and M = 2 as an example, in the state where the magnetic tape T is run at the running speed of (2N-1) V. ,
For example, as shown in FIG. 5, the recorded magnetic tape T on which recording traces are recorded by the video signals of (2N-1) programs is changed to the running speed (2N-
1) Running speed different from V ｛(2N-1) + M)｝ V
[Where N is a natural number of 2 or more, M is 0 and ｛− (2N
-1)} and {an integer other than -2 (2N-1)}], and the rotation trajectories of the rotating magnetic heads Ha and Hb and the scanning on the recorded magnetic tape T described above. The video signal reproduced by the rotary magnetic heads Ha and Hb so that the recording traces coincide with each other includes information of all programs recorded on the recorded magnetic tape equally. Appears regularly at a cycle of 9 fields, and the content becomes a video signal skipping 11 fields. Further, when M is an even number as in the above example, the video signals obtained continuously as shown in FIG. 8 are such that the video signals of all the odd number programs are in a predetermined repetition order, and The reproduction mode is such that the video signal in the odd field period and the video signal in the even field period appear alternately on the time axis.

The video signals sequentially reproduced in the above-described state are stored in the memory 22 by the signal processing circuit 19 and read out from the memory 22 in a predetermined order.
As shown below, it is possible to create a video signal that can display them at once with the image contents of a plurality of programs arranged on a display, The image signals of a plurality of programs can be displayed on the image display surface of one display at a time on the image display surface of one display in a state of being arranged in a predetermined manner on the display by the image signal generated as described above. .

As described in detail above, according to the present invention, the video contents of a plurality of programs can be instantaneously switched and reproduced, and the so-called H arrangement on the recorded magnetic tape is in a good state. Therefore, even if the state of tracking the recording trace by the rotary magnetic head during reproduction is slightly deteriorated, no significant deterioration in image quality occurs. Further, according to the present invention, a specific It is possible to easily confirm not only one program content but also a plurality of program contents.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a time chart for explaining the operation.

FIG. 3 is a time chart for explaining the operation.

FIG. 4 is a time chart for explaining the operation.

FIG. 5 is a diagram showing a recording trace pattern for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is a diagram showing a recording trace pattern for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a diagram for explaining an operation example during reproduction of the magnetic recording / reproducing apparatus of the present invention.

FIG. 8 is a diagram for explaining an operation example during reproduction of the magnetic recording / reproducing apparatus of the present invention.

FIG. 9 is a diagram showing a recording trace pattern recorded and formed on a magnetic tape of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

T: magnetic tape, 4: recording / reproducing signal processing circuit, 7, 11
... Phase comparator, 8,13 ... Amplifier, 9 ... Reference signal generator, 15 ... Control signal discriminator, 17 ... Track identification signal generator, 18 ... Control signal generator, 19 ...
Signal processing circuit,

────────────────────────────────────────────────── (5) References JP-A-60-185209 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/7826 G11B 5/027 501 H04N 5 / 92 H04N 5/937

Claims (1)

(57) [Claims] 1. A rotating drum provided with a pair of rotating magnetic heads having opposite azimuth angles at 180-degree symmetric positions is rotated at a predetermined number of revolutions, and the peripheral surface of the rotating drum is rotated. When the magnetic tape running at a predetermined running speed V while being wound around a part of the tape is sequentially and alternately helically scanned by the pair of rotating magnetic heads,
180 of each rotating magnetic head in a pair of rotating magnetic heads
In a magnetic recording / reproducing apparatus in which sequential recording traces by a video signal for one field period in a video signal to be recorded are sequentially formed adjacent to each other on a magnetic tape in correspondence with the rotation every degree, In the (2N-1) (where N is a natural number of 2 or more) programs to be reproduced, the recording traces by the video signal of each program are (2N-1) lines in a certain repetition order. A recorded magnetic tape, which is arranged for each recording trace and has a recording trace formed by a video signal in an odd-numbered field period and a recording trace formed by a video signal in an even-numbered field period adjacent to each other, is denoted by {(2N-1) ) + M {V (where M is an integer other than 0 and {-(2N-1)} and {-2 (2N-1)}], and Record Means for matching the trace with the rotation locus of the rotating magnetic head, and displaying (2N-1) programs images recorded on the recorded magnetic tape in a predetermined arrangement state on one display screen. A magnetic recording / reproducing apparatus comprising: a signal processing unit configured to include at least a memory for performing signal processing on a video signal sequentially reproduced from a rotating magnetic head so that the video signal can be processed.