JPH11250430A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a helical scan magnetic recording and reproducing device of a multi-segment system which can obtain a good reproduced picture even at the time of high speed search. SOLUTION: At the time of high speed search operation in which an already recorded magnetic tape T is made to run in the forward direction, the magnetic tape T recorded by a helical scan magnetic recording and reproducing device of a multi-segment system using first and second rotating magnetic heads in which digital data having one frame of picture information divided so as to correspond to the prescribed number N (N: integer of 1 or more) of recording track are arranged at positions symmetric in 180 degrees with respect to a center shaft of a drum is made to run with a running speed indicated by (4N×M+1) V (M: integer of 1 or more) for running speed at the time of recording operation. Further, an angle between a rotating track of a rotating magnetic head H and a reference edge of a magnetic tape is controlled by a drum tilt control section 8 so as to coincide with the prescribed track angle, and a high speed search picture having good picture contents is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to one frame of digital data based on a main signal such as image information and audio information divided so as to correspond to a plurality of predetermined recording traces, and has a frequency of f.
A recorded signal in which a pilot signal of the ATF system in which a pilot signal of frequency 1 and a pilot signal of frequency f2 are sequentially and alternately recorded every other recording track is recorded. Helical scan type magnetic recording / reproducing by the multi-segment system, which can reproduce a reproducing signal that can produce a good reproduced image while the magnetic tape is running at a running speed higher than the running speed at the time of recording. Related to the device.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and a recording / reproducing operation is performed using a rotating magnetic head. The helical scan type magnetic recording / reproducing apparatus thus configured has been widely used as a VTR. In the helical scan type magnetic recording / reproducing apparatus described above, as one means for achieving high-density recording, a pair of rotating magnetic heads having magnetic air gaps having opposite azimuth angles, that is, The azimuth angle of the magnetic gap is 9 clockwise with respect to the width direction of the recording trace.
A rotating magnetic head having a magnetic gap set at a predetermined angle of 0 ° or less, and an azimuth angle of the magnetic gap set at a predetermined angle of 90 ° or less counterclockwise with respect to the width direction of the recording trace; A pair of rotating magnetic heads comprising a rotating magnetic head having a magnetic air gap, by rotating an upper drum provided at a position symmetrical by 180 degrees at a predetermined number of rotations,
A magnetic tape that runs at a predetermined running speed in a state where the position of the reference edge of the magnetic tape that is obliquely wound around at least a part of the peripheral surface of the drum is regulated by a guide that is provided on the lower drum. 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
Corresponding to the rotation every degree, sequential recording traces by a signal to be recorded are sequentially recorded and formed on the magnetic tape adjacent to each other, or recorded information in the recording traces is reproduced.

[0003] By the way, as for a home digital VCR (VCR) which enables helical scanning of a running magnetic tape with a rotating magnetic head and azimuth recording (reproduction) of digital data on the magnetic tape, there are many VTRs in various countries around the world. As a result of discussions at the "HD Digital VCR Council" in which manufacturers and
Standards have been established. According to the DVC standard, image information is highly efficiently compressed by various techniques such as discrete cosine transform (DCT), adaptive quantization, and variable-length coding, and digital data and audio information of the highly efficient compressed image information are compressed. Digital data, as an SD mode signal or an HD mode signal, a high efficiency compression mode to be applied when recording and reproducing on a magnetic tape, a configuration mode of recording data, a predetermined tape pattern, a physical property of the magnetic tape, The configuration mode and the like of the cassette are defined.

[0004] Data that has been subjected to a predetermined format in accordance with the DVC standard is a sync block formed by adding a SYNC word, an ID code, and a parity word (inner parity) for error correction encoding. A total of 10 image data (N
It is recorded in a state where it is divided into 12 recording traces (tracks) in the case of a TSC color video signal or 12 (in the case of a PAL color video signal).

In a conventional home-use helical scan type magnetic recording / reproducing apparatus, a control signal recorded in a region near the lower edge of a magnetic tape every rotation of an upper drum using a fixed head is reproduced. A reproduction tracking method of a control track method (CTL method) used for a tracking operation at the time has been adopted. However, in the helical scan type magnetic recording / reproducing apparatus implementing the above-mentioned reproduction tracking method, an extra space required for installing a fixed head has hindered miniaturization of the apparatus.

In a home helical scan type digital magnetic recording / reproducing apparatus commercialized in recent years, during a recording operation, a tracking pilot signal is superimposed on digital data of a main signal such as video and audio. The recorded signal is recorded on a magnetic tape by a rotating magnetic head attached to the upper drum, and during a reproducing operation, a cross of a pilot signal reproduced from recording traces on both sides of the recording trace to be reproduced. An ATF (Automatic Tracking Finding) system in which a talk component is compared and a tracking operation of the rotary magnetic head is performed is adopted.

In the ATF system, the frequency f is applied to the recording traces on both sides of the recording trace where no pilot signal is recorded.
The recording trace where the pilot signal of frequency f2 is recorded and the recording trace where the pilot signal of frequency f2 is recorded, and the recording trace where the pilot signal of frequency f1 is recorded, Is a state in which two types of pilot signals, i.e., the pilot signal of f2, are alternately arranged every other recording trace. Now, assuming that a pilot signal having a frequency of f0 is recorded in a recording trace where no pilot signal is recorded, an arrangement state of pilot signals recorded in sequential recording traces will be described. 4 recordings such as a signal → a pilot signal having a frequency f1 → a pilot signal having a frequency f0 → a pilot signal having a frequency f2 → a pilot signal having a frequency f0 → a pilot signal having a frequency f1 → a pilot signal having a frequency f0. It is in an array state where it makes a round for each trace [see (a) of FIG. 7].

The tracking control at the time of a reproducing operation performed by using a reproducing rotary magnetic head having a head track width larger than the recording track width of the recording track recorded on the magnetic tape is performed by the above-described reproducing control. In a state where the rotating magnetic head is tracking a recording trace where a pilot signal of frequency f0 is recorded, a pilot signal of frequency f1 recorded in recording traces adjacent to both sides of the recording trace and a pilot signal of frequency f2 are recorded. This is performed so that the signal level of the crosstalk component with the pilot signal becomes equal.

[0009] By the way, the recording and reproduction of the SD mode signal of the DVC standard and the recording and reproduction of the HD mode signal of the DVC standard are performed by a multi-segment recording and reproduction method, including a home digital VCR (VCR). In a scan type magnetic recording / reproducing apparatus, the position of the rotation locus of the rotary magnetic head drawn in the space by the rotary magnetic head is always constant under the condition that the inclination angle of the rotary shaft of the rotary magnetic head does not change. . However, in a helical scan type magnetic recording / reproducing apparatus, the pattern of a recording mark (track pattern) formed on a magnetic tape according to the rotation locus of a rotating magnetic head depends on the diameter of the drum, the number of rotations of the rotating magnetic head, the rotating magnetic head. The rotation direction of the magnetic tape, the traveling speed of the magnetic tape, the traveling direction of the magnetic tape, the track angle, the head track width, the recording area width of the magnetic tape, etc. are determined by various conditions, such as by changing the operation mode of the magnetic recording and reproducing apparatus, for example, If conditions such as the running direction and running speed of the magnetic tape change,
The pattern of the rotation locus of the rotating magnetic head drawn on the magnetic tape changes.

That is, in a helical scan type magnetic recording / reproducing apparatus, an operation mode other than a normal reproduction (normal reproduction) operation in which a reproduction operation of recorded information is performed at the same magnetic tape traveling speed as a recording operation, for example, a recording mode When the magnetic tape is run (including stoppage) at a running speed or running direction different from the running speed or running direction of the magnetic tape at the time, variable speed playback [or trick play] is performed in which a playback operation is performed. In this case, the rotation locus of the rotating magnetic head differs depending on the change in the running speed and running direction of the magnetic tape, and the rotating locus of the rotating magnetic head intersects with the recording trace on the recorded magnetic tape. And the running speed of the magnetic tape during playback is significantly different from the running speed of the magnetic tape during recording. From Ray time of the rotary magnetic head, it will not be reproduced accurately recording signal recorded in the recording marks.

[0011]

The above-described DV
Home digital VT that performs recording and reproduction of signals in various modes of the C standard by a multi-segment recording and reproduction method
In R (VCR), as described above, one frame of image data consists of 10 (in the case of an NTSC color video signal) or 12 (in the case of a PAL color video signal) one frame. Is recorded in a state where it is divided into a plurality of recording traces (tracks). Therefore, in a high-speed search in a state where the recorded magnetic tape is running faster than the running speed of the magnetic tape at the time of recording. The rotation trajectory of the rotating magnetic head is
It is in a state of intersecting with the recording mark on the recorded magnetic tape on which the image data of the frame is recorded, so that the recording signal recorded in the recording mark cannot be reproduced properly from the rotating magnetic head. become.

Conventionally, in a digital VTR for home use based on a multi-segment recording / reproducing method, a natural and easy-to-view image can be reproduced even during variable speed reproduction.
For example, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-245184, there has been proposed a technique in which reproduction data obtained by scanning a plurality of times are connected by reproduction heads having different azimuth angles from each other. . Increasing the number of read heads in the manner of the above proposal may provide some good results because of the increased chance of tracking the desired recording trace, but the number of read heads is doubled. In this case, since the reproducing head crosses the desired recording trace diagonally, the signal level of the reproducing signal decreases, the error rate increases, and block noise easily occurs on the screen. When the number of reproducing heads is increased to prevent the above-mentioned problem from occurring, it is difficult to arrange a large number of reproducing heads and a corresponding rotary transformer in a limited space. In addition, there is another problem that the switching circuit of the head becomes complicated.

[0013]

According to the present invention, a predetermined number 4N
(Where N is an integer of 1 or more), a digital signal of a main signal such as image information and audio information of one frame divided so as to correspond to the recording trace includes a pilot signal of frequency f1 and a digital signal of frequency f2. A pilot signal is superimposed on a tracking pilot signal of the ATF system, which is recorded alternately every other recording track, and the recording signal is superimposed on the first rotating magnetic field having a magnetic gap of a first azimuth angle. A head and a second rotating magnetic head having a magnetic gap with a second azimuth angle are arranged at 180-degree symmetric positions about the center axis of the drum as a symmetry center, and rotate at a predetermined rotation speed. The first and second magnetic tapes run at a running speed V in a state of being wound around a part of the peripheral surface of both an upper drum and a lower drum provided coaxially with the upper drum. Second The recorded magnetic tape recorded by helical scan type magnetic recording reproducing apparatus according to a multi-segment type to be recorded by the rotary magnetic head,
(4N × M + 1) V with respect to the traveling speed V during the recording operation
(Where M is an integer equal to or greater than 1), and travels in the same traveling direction as during the recording operation, and the first and second rotating magnetic heads are driven in the same manner as during the recording operation. Means for rotating at the same predetermined number of rotations in the direction of rotation, means for making the rotation trajectory of the first and second rotating magnetic heads parallel to the longitudinal direction of the recording mark of the recorded magnetic tape, A reproduced from the used magnetic tape
Based on the TF tracking pilot signal,
Means for performing tracking control by changing the traveling speed of the recorded magnetic tape,
And digital data of a main signal such as one frame of image information and audio information divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording traces, and a pilot signal having a frequency of f1. A recording signal obtained by superimposing a pilot signal for tracking of the ATF system in which a pilot signal having a frequency of f2 is alternately recorded at every other recording trace has a magnetic gap having a first azimuth angle. A first rotating magnetic head and a second rotating magnetic head having a magnetic air gap of a second azimuth angle are arranged at 180-degree symmetrical positions with respect to the center axis of the drum as a symmetric center, and An upper drum that rotates at a rotational speed, and a magnetic tape that runs at a running speed V while being wound on a part of the peripheral surface of both drums, the lower drum being provided coaxially with the upper drum, Previous First was, the recorded magnetic tape recorded by helical scan type magnetic recording reproducing apparatus according to a multi-segment type to be recorded by the second rotary magnetic head, the running speed V of the recording operation,
(4N × M-1) V (where M is an integer of 1 or more), and the head is caused to travel in a traveling direction opposite to that during the recording operation, and to perform the first and second rotating magnetic heads. Means for rotating the same at the same predetermined rotational speed in the same rotational direction as in the above-mentioned recording operation;
Means for making the rotational trajectory of the rotating magnetic head parallel to the longitudinal direction of the recording mark of the recorded magnetic tape, and the ATF tracking pilot signal reproduced from the recorded magnetic tape. A magnetic recording / reproducing apparatus including means for performing tracking control by changing a traveling speed; and a frame of one frame divided so as to correspond to a predetermined number 4N + 2 (where N is an integer of 1 or more) recording traces. ATF tracking for digital data based on main signals such as image information and audio information, in which a pilot signal having a frequency of f1 and a pilot signal having a frequency of f2 are sequentially and alternately recorded every other recording trace. The recording signal obtained by superimposing the pilot signal is
A first rotating magnetic head having a magnetic gap at a first azimuth angle, and a second rotating magnetic head having a magnetic gap at a second azimuth angle
Rotating magnetic head is disposed at a position symmetrical about 180 degrees about the center axis of the drum, and is provided at an upper drum rotating at a predetermined rotation speed, and is provided coaxially with the upper drum. Helical scan by a multi-segment system in which the first and second rotating magnetic heads record on a magnetic tape running at a running speed V while being wound on a part of the peripheral surface of both drums with the lower drum. (4N + 2) × 2M + with respect to the traveling speed V during the recording operation.
At a traveling speed indicated as 1｝ V (where M is an integer of 1 or more) and traveling in the same traveling direction as in the recording operation, the first and second rotating magnetic heads are moved in the recording operation. Means for rotating at the same predetermined rotational speed in the same rotational direction as the time, and means for making the rotation trajectory of the first and second rotating magnetic heads parallel to the longitudinal direction of the recording mark of the recorded magnetic tape. A magnetic recording / reproducing apparatus comprising: means for performing a tracking control by changing a running speed of a recorded magnetic tape based on an ATF tracking pilot signal reproduced from the recorded magnetic tape; The digital data of the main signal such as image information and audio information of one frame divided so as to correspond to the recording trace of the formula 4N + 2 (where N is an integer of 1 or more) is added to the digital data of frequency f1. A recording signal formed by superimposing an ATF tracking pilot signal in which an pilot signal having a frequency of f2 and a pilot signal having a frequency of f2 are sequentially and alternately recorded at every other recording trace is converted to a magnetic signal having a first azimuth angle. A first rotating magnetic head having an air gap and a second rotating magnetic head having a magnetic air gap having a second azimuth angle are disposed at 180-degree symmetrical positions about the center axis of the drum. A magnet running at a running speed V while being wound on a part of the peripheral surface of both an upper drum rotating at a predetermined rotation speed and a lower drum provided coaxially with the upper drum; A multi-segment helical scan type magnetic recording / reproducing apparatus that records data on the tape by the first and second rotating magnetic heads is used for recording. The traveling speed V of time
｛(4N + 2) × 2M-1｝ V (where M
Is an integer of 1 or more) and travels in a traveling direction opposite to that during the recording operation, and causes the first and second rotating magnetic heads to rotate in the same rotational direction as during the recording operation. Means for rotating at the same predetermined number of revolutions, means for causing the rotation trajectories of the first and second rotating magnetic heads to be parallel to the longitudinal direction of the recording mark of the recorded magnetic tape, and And a means for performing tracking control by changing the running speed of a recorded magnetic tape based on an ATF tracking pilot signal reproduced from the ATF system.

[0014]

FIG. 1 is a block diagram showing a schematic configuration of an example of a magnetic recording / reproducing apparatus according to the present invention. FIG.
In the drawings, a detailed description of a rotation control system of the drum, a control system of a running speed and a running phase of the magnetic tape (capstan control system) and the like is omitted for simplification of the drawing.
In the magnetic recording / reproducing apparatus shown in FIG. 1, reference numeral 1 denotes an input terminal of a recording target signal such as an image signal and an audio signal to be recorded. Reference numeral 3 denotes a signal processing circuit for a recording system and a reproducing system.
Then, after converting the recording target signal supplied to the input terminal 1 into a digital signal at the time of recording operation, formation of a DCT block, DCT operation processing, quantization and variable length encoding,
It performs addition of an error correction code and other necessary signal processing.

In the signal processing circuit 3 of the recording system and the reproduction system, the recording trace of each magnetic tape T is
Addition circuit that adds identification signals for reciprocal recording as necessary as recording data in a signal format divided into each area such as insert information area, audio signal area, video signal area, subcode area, etc. 6
Note that the signal processing circuit 3 of the recording system and the reproducing system is
It may be configured to be able to generate SD mode signals and HD mode signals in the VC standard. Further, when the signal supplied to the input terminal 1 is a digital signal, it is not necessary to convert the recording target signal supplied to the input terminal 1 into a digital signal by the recording and reproduction signal processing circuits 3 described above. .

In the adder circuit 6, a pilot signal generating circuit (a pilot signal having a frequency f1 and a frequency f
2). The pilot signal supplied from the pilot signal generation circuit 10) is added to the recording data supplied from the addition circuit 6 from the signal processing circuit 3 for the recording and reproduction systems described above, and the resulting signal is used as a recording signal. The signal is supplied to the rotary magnetic head H via the switching circuit 7 (when no specific rotary magnetic head is designated, the reference numeral H is used). The head switching circuit 7 sends the above-described recording signal to a predetermined rotating magnetic head among a plurality of rotating magnetic heads H described later, according to a head switching control signal HSW generated by the timing control circuit 9. A switching operation that can be supplied is performed.

Reference numeral 5 denotes a control unit (system controller). The main control unit 5 controls each component of the magnetic recording / reproducing apparatus, for example, the above-described timing generation circuit 9, in accordance with input information from an operation unit (not shown). Drum control circuit 3
1. Control signals are supplied to a control system (capstan control system) 32 for controlling the running speed and running phase of the magnetic tape, a drum tilt control unit (drum tilt control mechanism) 8, and the like. The capstan control system 32 operates to run the magnetic tape in a predetermined running direction at a predetermined tape running speed according to the recording / reproducing mode.

The drum tilt control unit 8 to which a control signal is supplied from the main control unit 5 operates in the forward direction (for example, in FIGS. 1 and 5 to 5).
A magnetic tape running at a predetermined magnetic tape running speed in the direction of arrow b shown in FIG. 7 and the like or in the opposite direction (the direction opposite to arrow b, for example, the direction of arrow -b shown in FIG. 1). The operation of the drum tilt controller 8 is performed so that the angle formed between the rotation locus of the rotary magnetic head H and the reference edge of the magnetic tape is the same as the reference track angle of the recording mark formed on the magnetic tape. To tilt the center angle of the drum.

A read signal reproduced by the rotary magnetic head H during a reproducing operation is supplied to a recording system via a head switching circuit 7 performing a predetermined switching operation in accordance with a head switching control signal generated by a timing control circuit 9. And to the signal processing circuit 3 of the reproducing system. In the signal processing circuit 3 of the recording system and the reproducing system, the reproduced signal supplied thereto is subjected to waveform equalization by a waveform equivalent circuit, and then the digital data is stored in a memory via a code detection circuit and a phase locked loop (PLL). To be stored.

The digital data of the digital memory is read out at the read permission signal timing supplied from the main control unit 5 and then converted into a bit stream arranged in series on the time axis. Correction signal processing is performed. Next, the digital data output after the variable-length code is decoded by the variable-length decoding unit is subjected to inverse DCT by an inverse DCT circuit and stored in a frame memory, and the digital data read from the frame memory is output. Send to terminal 2.

The reproduced signal is also supplied from the head switching circuit 7 to the input terminal 4a of the ATF circuit 4. FIG. 2 is a diagram showing an example configuration of the ATF circuit 4. In FIG. 2, reference numeral 38 denotes a band-pass filter for extracting a pilot signal having a frequency of f1, 39 denotes a band-pass filter for extracting a pilot signal having a frequency of f2, 40 and 41 denote detection circuits, 42 denotes a subtraction circuit, and 43 denotes a subtraction circuit. The timing generation circuit 44 is a sample hold circuit. Input terminal 4a
Band-pass filter 38 provided with the reproduced signal supplied to
The pilot signal having the frequency f1 extracted from the reproduced signal is supplied to the detection circuit 40 and detected. The output signal from the detection circuit 40 is supplied to a subtraction circuit 42 as a minuend signal.

The pilot signal having a frequency f2 extracted from the reproduced signal by the band-pass filter 39 to which the reproduced signal supplied to the input terminal 4a is supplied is supplied to the detection circuit 41 and detected. The output signal from the detection circuit 41 is supplied to a subtraction circuit 42 as a subtraction signal. From the subtraction circuit 42, an ATF error signal (tracking error signal) generated in correspondence with the signal level difference between the pilot signal having the frequency f1 and the pilot signal having the frequency f2 is provided. The sample data is sampled and held by 44, and is supplied as a phase control signal to an addition circuit 34 in a control system (capstan control system) 32 of the running speed and running phase of the magnetic tape via the output terminal 4c. The sample and hold operation in the sample and hold circuit 44 is performed by a pilot sample signal supplied from the timing generation circuit 43 to the sample and hold circuit 44.

As the frequency dividing circuit 37 in the control system (capstan control system) 32 for the traveling speed and traveling phase of the magnetic tape, for example, a programmable frequency divider can be used. The frequency divider 37 is attached to the rotation shaft of the capstan motor 11 for driving the capstan 33 when the magnetic recording / reproducing apparatus performs a search operation in a forward direction or a reverse direction at a predetermined search speed. The output signal CAPFG of the frequency generator (FG) is divided by a frequency division ratio according to the search speed supplied from the main control unit 5 and supplied to the frequency-voltage converter 36. The output signal from the frequency-to-voltage converter 36 is a speed control signal, which is added to the ATF signal (phase control signal) described above by the adding circuit 34 and is supplied to the driving circuit 35, and is supplied to the driving circuit 35.
Is supplied to the capstan motor 11. Thus, the magnetic tape T sandwiched between the capstan motor 33c and the pinch roller 33p is controlled to run at a predetermined running speed and running phase.

The predetermined traveling speed of the recorded magnetic tape according to the above-mentioned search speed is represented by the following relationship with the traveling speed V during the recording operation. First,
(1) A digital signal of a main signal such as image information and audio information of one frame divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording traces includes a pilot having a frequency of f1. A recording signal obtained by superimposing a tracking pilot signal of the ATF system in which a signal and a pilot signal having a frequency of f2 are sequentially and alternately recorded at every other recording trace is converted into a magnetic gap having a first azimuth angle. A first rotating magnetic head having a magnetic air gap having a second azimuth angle and a second rotating magnetic head having a magnetic gap of a second azimuth angle are disposed at 180-degree symmetric positions with respect to the center axis of the drum, The upper drum rotating at a predetermined number of revolutions, and the lower drum provided coaxially with the upper drum. Magnetic tape When a recorded magnetic tape recorded by a multi-segment helical scan type magnetic recording / reproducing apparatus of the multi-segment type, which is recorded by the first and second rotating magnetic heads, is played back in a forward direction, , With respect to the traveling speed V during the recording operation, (4N ×
The traveling speed indicated as (M + 1) V (where M is an integer of 1 or more) is a predetermined traveling speed.

Also, (2) 1 is divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording traces.
An ATF system in which a pilot signal having a frequency of f1 and a pilot signal having a frequency of f2 are sequentially and alternately recorded at every other recording trace in digital data of a main signal such as image information and audio information of a frame. A first rotating magnetic head having a magnetic air gap of a first azimuth angle; and a recording signal obtained by superimposing a tracking pilot signal.
A second rotating magnetic head having a magnetic air gap having a second azimuth angle, an upper drum rotating at a predetermined number of rotations, arranged at a position symmetrical with respect to the center axis of the drum at 180 degrees, and The first and second magnetic tapes running at a running speed V in a state of being wound around a part of the peripheral surface of both the upper drum and the lower drum provided coaxially with the upper drum are described. When the recorded magnetic tape recorded by the rotating magnetic head is played back while traveling in the direction opposite to the traveling direction of the magnetic tape during the recording operation, the traveling speed V during the recording operation is used.
In contrast, the traveling speed indicated as (4N × M-1) V (where M is an integer of 1 or more) is the predetermined traveling speed.

Further, (3) digital data based on main signals such as one frame of image information and audio information divided so as to correspond to a predetermined number of 4N + 2 (where N is an integer of 1 or more) recording traces are: A pilot signal having a frequency of f1 and a pilot signal having a frequency of f2 are superimposed with a tracking pilot signal of the ATF system in which the pilot signal is recorded alternately at every other recording trace.
A first rotating magnetic head having a magnetic gap at a first azimuth angle, and a second rotating magnetic head having a magnetic gap at a second azimuth angle
Rotating magnetic head is disposed at a position symmetrical about 180 degrees about the center axis of the drum, and is provided at an upper drum rotating at a predetermined rotation speed, and is provided coaxially with the upper drum. Helical scan by a multi-segment system in which the first and second rotating magnetic heads record on a magnetic tape running at a running speed V while being wound on a part of the peripheral surface of both drums with the lower drum. When the recorded magnetic tape recorded by the magnetic recording / reproducing apparatus of the type is reproduced by traveling in the forward direction, the traveling speed V during the recording operation is represented by {(4N + 2) × 2M + 1} V (where
M is a running speed indicated as an integer of 1 or more).

Further, (4) digital data based on a main signal such as image information and audio information of one frame divided so as to correspond to a predetermined number 4N + 2 (where N is an integer of 1 or more) recording traces. A pilot signal having a frequency of f1 and a pilot signal having a frequency of f2 are superimposed with a tracking pilot signal of the ATF system in which recording is performed alternately at every other recording trace.
A first rotating magnetic head having a magnetic gap at a first azimuth angle, and a second rotating magnetic head having a magnetic gap at a second azimuth angle
Rotating magnetic head is disposed at a position symmetrical about 180 degrees about the center axis of the drum, and is provided at an upper drum rotating at a predetermined rotation speed, and is provided coaxially with the upper drum. Helical scan by a multi-segment system in which the first and second rotating magnetic heads record on a magnetic tape running at a running speed V while being wound on a part of the peripheral surface of both drums with the lower drum. When the recorded magnetic tape recorded by the magnetic recording / reproducing apparatus of the type is reproduced by traveling in the direction opposite to the traveling direction of the magnetic tape during the recording operation, the traveling speed V during the recording operation is
This is the traveling speed indicated as {(4N + 2) × 2M-1} V (where M is an integer of 1 or more).

When the recorded magnetic tape T is run in the forward direction or the reverse direction at different predetermined running speeds, the angle between the rotation locus of the rotary magnetic head H and the reference edge of the magnetic tape is as follows. The differences are as described above. In the magnetic recording / reproducing apparatus of the present invention, even when the recorded magnetic tape T is run in the forward direction or the reverse direction at different predetermined running speeds, the rotation trajectory of the rotary magnetic head H and the reference edge of the magnetic tape are different. Is always controlled to match a predetermined track angle.

As described above, even if the running direction and running speed of the magnetic tape T are changed, the angle between the rotation locus of the rotary magnetic head H and the reference edge of the magnetic tape always coincides with the predetermined track angle. The components for performing the control operation for this purpose are a main control unit (system controller) 5 and a drum tilt control unit (drum tilt control mechanism unit) in FIG.
8 and the system controller 5 and the drum tilt control unit 8 in FIG. 3 and the mechanism shown in FIG. First, referring to FIG. 3, the rotation locus drawn on the magnetic tape T by the rotating magnetic head is controlled so as to be at an arbitrary predetermined angle with respect to the reference edge Te of the magnetic tape T, and the position of the lead ring Lr is controlled. An outline of a configuration principle and an operation principle of an inclination correction mechanism portion for making the regulating surface G coincide with the movement locus of the traveling magnetic tape T will be described.

In FIG. 3, DB is a drum base, and a drum structure DA composed of an upper drum Du, a lower drum Dd, and a lead ring Lr is supported by the drum base DB. The upper drum Du is a drum structure D
A lower bearing Dd is fixed to the center axis of the drum assembly DA by a bearing (not shown) mounted on the center axis 12 of A in a rotatable manner with respect to the center axis of the drum assembly DA. Have been. The lead ring Lr, which functions as a guide for the reference edge Te (see FIG. 1) of the magnetic tape T, is formed separately from the lower drum Dd and is close to the outer peripheral portion 13 below the lower drum Dd. Further, the knife ring E (see FIG. 4) provided on the inner periphery of the lead ring Lr coaxially fits (not shown) with the lower protrusion of the lower drum Dd.

As illustrated in FIG. 3 (an exploded perspective view of a specific configuration is shown in FIG. 4), the drum tilt control unit 8 includes a tilt drive motor (DD in FIG. 3) as a power source. Motor) 14, and reduction mechanisms 15, 16 including a plurality of gears,
It includes a rotary encoder 17, a position detector (preset sensor) 18, and the like. The tilt drive motor 14 shown by a block 14 in FIG.
It also includes a motor drive control circuit. As the above-described position detector 18, for example, one having a configuration in which an arc-shaped light shielding plate is moved in an optical path in which a light emitting element and a light receiving element are arranged to face each other may be used. The position detector 18 is configured such that the signal output from the position detector 18 at the moment when the arc-shaped light shielding plate is removed from the optical path in which the light emitting element and the light receiving element are arranged to face each other is the drum described above. It is used as information indicating the reference position of the center axis 12 of the structure DA and the reference position of the lead ring Lr.

The amount of rotation of the light-shielding plate from the reference position in the position detector 18 is known by measuring the number of pulses output from the rotary encoder 17 so that the reference position of the center axis 12 of the drum structure DA is determined. Direction and the amount of deviation from the reference position of the lead ring Lr can be obtained. The running direction and running speed of the magnetic tape T are controlled by the main control unit 5 according to various operation modes set in the main control unit (system controller) 5 of the magnetic recording / reproducing apparatus. The drum inclination control unit 8 to which the information is given,
The central axis 1 of the drum structure DA including the upper drum Du, the lower drum Dd, and the lead ring Lr in the drum structure DA.
2 in the direction of arrow 12a (or 12b) in FIG.
The screw 2 is tilted by a predetermined amount.
A control operation is performed so as to advance and retreat 6, 28.

The lead ring Lr is also tilted by a predetermined amount in a predetermined direction under the control of the drum tilt control unit 8, whereby the running direction of the magnetic tape is set to either the forward or reverse direction. Even in this case, the pattern of the rotation locus drawn on the magnetic tape T by the rotation locus of the rotary magnetic head is set to a predetermined track angle, that is, a state where the inclination is corrected, and the reference edge Te of the magnetic tape is moved. The guide portion G (position regulating surface) of the lead ring coincides with the trajectory.

First, in a state where the magnetic tape T is run in the forward direction (the direction of the arrow b in FIG. 1) at a predetermined running speed during a normal recording / reproducing operation, the magnetic tape T is moved in a predetermined specific rotating direction. The lower drum Dd in the case where recording is alternately and sequentially formed on the magnetic tape T by the rotating magnetic head driven and rotated at the number of rotations of the lower drum Dd has four rotations whose bottom surface protrudes from the drum base DB. It is brought into a state where it is supported by a fulcrum (see the pivot fulcrums 20, 20, 21, 21 in FIG. 4). Further, the lead ring Lr is brought into a state where it is supported by four pivots (see pivots 22, 22, 23, 23 in FIG. 4) projecting from the lead ring Lr. . The aforementioned lead ring Lr
A spring (springs 19, 24, 25 in FIGS. 3 and 4) is mounted between the drum base DB and the lower drum Dd and the drum base DB, respectively. A predetermined connection state is set.

For example, during a recording / reproducing operation with the magnetic tape running in the forward direction, the screw 27 is driven so as to push up the bottom surface of the lower drum Dd, and the screw 29 is separated from the bottom surface of the lower drum Dd. Driven in the direction, two of the four pivots (rotation pivots 20, 20) projecting from the drum base DB contact the bottom surface of the lower drum Dd. With the two pivot points as pivot points, the center axes of the upper drum Du and the lower drum Dd are shown in FIG.
It is made to rotate in the direction of the middle arrow 12a.

When recording / reproduction is performed with the running direction of the magnetic tape reversed, the screw 29 is connected to the lower drum Dd.
And the screw 27
Is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four rotation supporting points protruding from the drum base DB.
Of the lower drum Dd
And the center axis of the upper drum Du and the lower drum Dd is rotated in the direction of the arrow 12b in FIG. 3 using the two rotation fulcrums as the rotation fulcrum.

The above-mentioned driving operation for the screws 27 and 29 is performed by the operation of the driving mechanism. The drive mechanism includes a motor 14 as a power source, a speed reduction mechanism including a plurality of gears, a position detector 18, a rotary encoder 17, and the like as shown in the exploded perspective view of FIG. ing. The traveling direction and traveling speed of the magnetic tape T correspond to various operation modes, and the main control unit 5 provided in the magnetic recording / reproducing apparatus.
In response to the setting, the drum inclination control unit 8 to which the control information is given from the main control unit 5,
, The center axis of the drum structure DA including the upper drum Du, the lower drum Dd (see FIG. 3), and the lead ring Lr,
The drive mechanism is controlled to advance and retreat the screws 27 and 29 so as to be inclined by a predetermined amount in the direction of the arrow 12a (or 12b) in FIG.

During a recording / reproducing operation in a state where the magnetic tape is traveling in the forward direction, two of the four pivots protruding from the lead ring Lr (the pivots). 22, 22) are in contact with the bottom surface of the lower drum Dd, and the lead ring L
r is screwed into the lead ring Lr such that the center axis of the r is rotated by a predetermined amount in the direction of the arrow 12a in FIG. 3, and the leading ends thereof respectively contact the bottom surface of the lower drum Dd. Two screws 2 provided as state
6, 28 are rotated in opposite directions.

Further, when recording and reproduction are performed with the running direction of the magnetic tape reversed, the read ring Lr
Of the four turning fulcrums (turning fulcrums 23, 23) protruding from the lower drum Dd contact the bottom surface of the lower drum Dd, and turn the two turning fulcrums. As a fulcrum, the lead ring Lr is screwed into the lead ring Lr so that the center axis of the lead ring Lr is turned by a predetermined amount in the direction of arrow 12b in FIG. The two screws 26 and 28 provided in contact with the bottom surface are rotated in opposite directions.

The above-mentioned driving operation for the screws 26 and 28 is also performed by the operation of the above-described driving mechanism which operates under the control of the drum inclination control unit. In response to the traveling speed being set in the main control unit 5 provided in the VTR in accordance with various operation modes, the drum inclination control unit 8 to which the control information is given from the main control unit 5 is used. , Lead Ring Lr
The drive mechanism is controlled so as to tilt by a predetermined amount in the direction of the arrow 12a (or 12b) in FIG. 3, and the screws 26 and 28 are advanced and retracted. In the above description, in order to facilitate understanding of the operation, in order to facilitate the understanding of the operation, the inclination operation of the central axis of the drum assembly by the advance and retreat operation of the screws 27 and 29, and the inclination operation of the central axis of the lead ring Lr by the advance and retreat operation of the screws 26 and 28. Were explained as if they were performed independently. However, the screws 26 to 29 described above are
And the screw 26 are simultaneously driven and rotated by a common power transmission mechanism, and the screw 29 and the screw 28 are simultaneously driven and rotated by a common power transmission mechanism. The operation of tilting the center axis of the drum structure by the operation and the operation of tilting the center axis of the lead ring Lr by the advancing and retreating of the screws 26 and 28 may be performed simultaneously.

In the magnetic recording / reproducing apparatus described with reference to FIGS. 3 and 4, the recording track formed on the magnetic tape is rotated by a predetermined angle at which the rotational trajectory plane of the rotary magnetic head coincides. The first tilt drive means for tilting the central axes of the upper and lower drums and the rotary magnetic head is provided separately from the upper and lower drums and at the lower portion of the lower drum. A position-regulating guide member (lead ring) Lr for the magnetic tape having a restricting surface G at the position of the reference edge of the magnetic tape, which is disposed close to the outer peripheral surface of the small-diameter portion 13 (see FIG. 4); A second inclination driving means for inclining the position regulating guide member of the magnetic tape so as to coincide with the reference edge position of the magnetic tape,
By inclining the lower drum and the lead ring Lr having the position regulating surface G of the reference edge of the magnetic tape as required according to various operation modes, the recording formed on the magnetic tape is performed. The track of rotation of the rotary magnetic head is made to coincide with the trace, and the reference edge Te of the magnetic tape T can be guided well by the position regulating surface G of the lead ring Lr.

In the magnetic recording / reproducing apparatus of the present invention, the main control unit 5 supplies the drum tilt control unit 8 with predetermined control signals corresponding to the respective recording / reproducing operation modes, whereby Even when the magnetic tape is traveling at various traveling speeds in the forward direction according to the recording / reproducing operation mode, or even when the magnetic tape is traveling at various traveling speeds in the reverse direction, the drum inclination control unit 8 can ,
The control operation is always performed such that the angle formed between the rotation locus of the rotary magnetic head and the reference edge of the magnetic tape coincides with the track angle.

In the case of a helical scan type magnetic recording / reproducing apparatus in which a video signal is recorded (reproduced) for one frame period or one field period for each recording track on the magnetic tape, As described above, if the rotation locus of the rotary magnetic head is made to coincide with the extension direction of the recording trace of the magnetic tape by the operation of the drum tilt control unit 8, a good reproduced image can be obtained even during the variable speed reproduction operation. For example, one frame of image data is divided into a plurality of recording traces (tracks) as in the case of a home digital VTR (VCR) in which recording and reproduction of a signal of the DVC standard described above are performed by a multi-segment recording and reproduction method. If it is recorded in a state where it is recorded, the rotation trajectory of the rotating magnetic head coincides with the extension direction of the recording mark on the magnetic tape during variable speed playback Now that the cause, good reproduced image can not be obtained.

Here, referring to FIGS. 5 to 7, etc.
The above point will be described as follows. First,
FIG. 7A shows two rotary magnetic heads provided at 180-degree symmetrical positions on the upper drum Du (of the two rotary magnetic heads, one of the rotary magnetic heads has an azimuth angle of a magnetic gap). Is L, and the other rotating magnetic head has an azimuth angle of the magnetic gap of R), so that one frame of image data is recorded in a state of being divided into a plurality of recording tracks (tracks). As an example, one frame of image data has four recording traces (for example, # 1 to # 4, # 5 to # 5).
# 8, # 9 to # 12...) Are shown as an example of the track pattern of the magnetic tape T when recorded in a divided state.

FIG. 7B shows four recordings from track No. 1 (# 1) to track No. 4 (# 4) shown in FIG. 7A. An example is shown in which a single reproduced image is projected on a display surface of a display device by image data recorded in a trace. Codes such as fo, f1, f2, etc. indicated as tracking frequencies in FIG. 7A are frequency fo (f1, f2).
This shows that each pilot signal described above as being the pilot signal in 2) is a recorded trace.

FIG. 5 shows the rotational locus of the rotating magnetic head during variable speed reproduction performed with the running speed of the magnetic tape T during the reproducing operation being faster than the running speed during the recording operation. This shows a state in which the tape sequentially traverses the recording traces. The hatched portions in FIG. 5 indicate portions where data in the recording trace is reproduced by the respective rotating magnetic heads moving across the sequential recording trace as described above. The reproduction state of data from the sequential recording traces in FIG. 5 is shown in FIG.
Considering in comparison with (b), depending on the reproducing operation in which the two rotating magnetic heads traverse successive recording traces in the state shown in FIG. 5, it is quite satisfactory. Obviously, the image cannot be reproduced.

Thus, the magnetic tape T during the reproducing operation
The traveling locus of the rotating magnetic head at the time of variable speed reproduction performed in a state where the traveling speed of
By the operation of the drum inclination control unit 8 described above, the recording trace is made to coincide with the extension direction of the recording trace of the recorded magnetic tape, and the recording trace is traced by the rotating magnetic head used to form the recording trace. For example, the data of the recording trace tracked by the rotary magnetic head can be reproduced from the rotary magnetic head. However, the relationship between the recorded traces and the reproduced images sequentially reproduced as described above does not become the relationship described above with reference to FIGS. 7A and 7B. Even if the data of the sequential recording traces is used, a good reproduced image is not always obtained.

Therefore, in the magnetic recording / reproducing apparatus of the present invention,
The running speed at the time of the high-speed search operation performed by running the recorded magnetic tape T in the forward direction or the reverse direction is shown by the following expressions (1) to (4) with respect to the running speed V at the time of the recording operation. A predetermined traveling speed having a specific relationship is set, and the angle between the reference edge of the recorded magnetic tape T running at the predetermined traveling speed and the rotation locus of the rotary magnetic head H is always set to a predetermined value. The variable speed reproduction is performed in a state where the track angle is matched with the track angle, so that a good reproduced image can be obtained even during the high-speed search operation.

The predetermined traveling speed of the recorded magnetic tape during the high-speed search operation of the magnetic recording / reproducing apparatus of the present invention is as follows for the traveling of the recorded magnetic tape in the forward and reverse directions, respectively. It will be shown by. [1] When a recorded magnetic tape is run in the forward direction. (A) Digital data based on one frame of image information divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording marks is symmetric with respect to the center axis of the drum by 180 degrees. The recorded magnetic tape recorded by the helical scan type magnetic recording / reproducing apparatus of the multi-segment system by the first and second rotating magnetic heads arranged at the position 4N × M + 1) V (where M is an integer of 1 or more) A high-speed search is performed with the traveling speed indicated by (1) as a predetermined traveling speed.

(B) A predetermined number 4N + 2 (where N is 1
First and second rotations in which digital data based on one frame of image information divided so as to correspond to the recording trace of the above (integer) are arranged at 180-degree symmetrical positions with respect to the center axis of the drum as a symmetry center. The recorded magnetic tape recorded by the magnetic recording / reproducing apparatus of the helical scan type using the multi-segment system by the magnetic head is compared with the traveling speed V during the recording operation by {(4N + 2) × 2M + 1} V (where M is 1 A high-speed search is performed using the traveling speed indicated by (2) as a predetermined traveling speed.

[2] When the recorded magnetic tape is run in the reverse direction. (A) Digital data based on one frame of image information divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording marks is symmetric with respect to the center axis of the drum by 180 degrees. The recorded magnetic tape recorded by the helical scan type magnetic recording / reproducing apparatus of the multi-segment system by the first and second rotating magnetic heads arranged at the position 4N × M-1) V (where M is an integer of 1 or more) A high-speed search is performed using the traveling speed indicated by (3) as a predetermined traveling speed.

(B) A predetermined number 4N + 2 (where N is 1
First and second rotations in which digital data based on one frame of image information divided so as to correspond to the recording trace of the above (integer) are arranged at 180-degree symmetrical positions with respect to the center axis of the drum as a symmetry center. The recorded magnetic tape recorded by the magnetic recording / reproducing apparatus of the helical scan type using the multi-segment system by the magnetic head is compared with the traveling speed V during the recording operation by {(4N + 2) × 2M-1} V (where M Is an integer of 1 or more) A high-speed search is performed using the traveling speed indicated by (4) as a predetermined traveling speed.

In the magnetic recording / reproducing apparatus of the present invention,
At the traveling speed shown by the above equations (1) and (2),
Run the recorded magnetic tape T in the forward direction,
At the traveling speed shown by the above equations (3) and (4),
In a state where the recorded magnetic tape T is running in the reverse direction, the angle between the rotation locus of the rotary magnetic head H and the reference edge of the magnetic tape is controlled so as to always coincide with a predetermined track angle. ing.

FIG. 6 shows a running speed in which N and M in the above equation (1) are set as N = 1 and M = 1, that is, a running speed 5V which is five times the running speed V during the recording operation. In this state, the recorded magnetic tape T is caused to travel in the forward direction, and the angle between the rotation locus of the rotating magnetic head H and the reference edge of the magnetic tape is always controlled to be equal to a predetermined track angle. FIG. 4 is a diagram illustrating a tracking state of two rotating magnetic heads when a high-speed search operation is performed.

In the operation example shown in FIG. 6 in which the recorded magnetic tape T is running at a running speed (5 times speed) that is five times the running speed of the magnetic tape during the recording operation, one of the upper drums Du is not moved.
Of the two rotating magnetic heads provided at the positions symmetrical by 80 degrees, one rotating magnetic head having the azimuth angle of the magnetic gap of L is properly tracking the recording trace of # 1. Reproduce the digital data of the recording trace of 1, then
The other rotating magnetic head having an azimuth angle R of the magnetic air gap reproduces the digital data of the recording trace of # 6 while correctly tracking the recording trace of # 6. The head reproduces the digital data of the recording trace of # 11 while correctly tracking the recording trace of # 11, and then the other rotating magnetic head having the azimuth angle R of the magnetic gap is the recording magnetic disk of # 16. The digital data of the recording trace # 16 is reproduced while the trace is correctly tracked.

An image based on the digital data of the recording trace of # 1, the digital data of the recording trace of # 6, the digital data of the recording trace of # 11, and the digital data of the recording trace of # 16 sequentially reproduced as described above. Are displayed as reproduced images on the display surface of the display device in an arrangement such as 1, 6, 11, 16 in FIG. By the way, in each image portion of 1, 6, 11 and 16 on the display surface of the display device illustrated in FIG.
The image portion 1 is an image based on digital data of the recording trace # 1 in the image information of one frame recorded in the recording traces # 1 to # 4.

The image portion 6 is the recording trace of # 5 to # 8.
Is an image based on the digital data of the recording trace of # 6 in the image information of one frame recorded in the recording trace of No. 11, and the image portion 11 is recorded in the recording traces of # 9 to # 12. # 11 in one frame of image information
Is an image based on the digital data of the recording trace of No. 16, and 16 image portions are # 16 in the image information of one frame recorded in the recording trace of # 13 to the recording trace of # 16.
5 is an image based on digital data of the recording trace.

That is, the image portions 1, 6, 11 and 16 in the reproduced image shown in FIG. 8 correspond to sequentially different image portions in one frame image on the time axis. This is also apparent from the recording trace pattern shown in FIG. Here, when each image portion of 1, 6, 11, and 16 in the reproduced image shown in FIG. 8 is made to correspond to each image portion in the reproduced image illustrated in FIG. 7B, The one image portion in the reproduced image shown in FIG. 8 is the same as the one image portion in the reproduced image illustrated in FIG. 7B, and the reproduced image shown in FIG. The image portion 6 in the image corresponds to the image portion 2 in the reproduced image illustrated in FIG. 7B, and the image portion 11 in the reproduced image shown in FIG. 7 corresponds to three image portions in the reproduced image illustrated in FIG. 7B, and further, 16 image portions in the reproduced image illustrated in FIG. 8 are illustrated in FIG. 7B. Corresponding to the four image parts in the reproduced image.

When the recorded image is a moving image, there is a strong correlation between the image content of each corresponding image portion in one successive frame image on the time axis. , 1, 6, 11, and 16, the reproduced image shown in FIG. 8 is a high-speed search image having good image contents.

FIG. 9 shows that in the above equations (1) and (3), for example, when N is set in the range of 1 to 5 and M is set in the range of 1 to 4, the expression (1) A high speed search operation in the forward direction is performed at the double speed number as shown in the column of "double speed number", and the double speed as shown in the column of "reverse speed double number" in equation (3). FIG. 9 is a diagram exemplifying that a high-speed search operation in the reverse direction is performed. FIG. 10 shows that, for the above-described equations (2) and (4), for example, when N is set in the range of 1 to 4 and M is set in the range of 1 to 4,
In the equation (2), a high-speed search operation in the forward direction is performed at the multiple speed as shown in the column of "multiple speed in the forward direction". It is a figure which illustrates that a high speed search operation in the reverse direction at the double speed number as shown in the column is performed.

As described above, in a home digital VCR (VCR) that performs recording and reproduction of signals in various modes of the DVC standard by the multi-segment recording and reproduction method,
Data that has been given a predetermined format according to the VC standard is a sync block formed by adding a SYNC word, an ID code, and a parity word (inner parity) for error correction coding. Since data is recorded in a state of being divided into a total of 10 (in the case of an NTSC color video signal) or 12 (in the case of a PAL color video signal) recording traces (tracks), for example, one frame 10 image data during the period (in the case of NTSC color video signal)
If the number of recording traces in the column of “number of recording traces per frame” in FIG. 10 corresponds to 10, the double speed number as shown in the column of “double speed number in forward direction” 2
, 41, 61, 81... Perform a high-speed search operation in the forward direction satisfactorily, and a multiple speed number 19 as shown in the column of “reverse double speed number” corresponding to 10 recording traces. , 3
9, 59, 79..., The reverse high-speed search operation is performed favorably.

For example, when the total number of image data for one frame period is 12 (in the case of a PAL color video signal), the recording in the column of “number of recording traces per frame” in FIG. Double speed numbers 13, 2 as shown in the column of "forward double speed number" corresponding to 12 traces
5, 37, 49..., The forward high-speed search operation is performed favorably, and the double-speed numbers 11, 23 as shown in the column of “reverse double-speed number” corresponding to 12 recording traces. , 3
The high-speed search operation in the reverse direction is favorably performed at 5, 47.

As is clear from the above description, in the magnetic recording / reproducing apparatus of the present invention, the digital data based on one frame of image information corresponds to a predetermined number 4N (where N is an integer of 1 or more) of recording traces. And the digital data of one frame of image information is divided so as to correspond to a predetermined number of 4N + 2 (where N is an integer of 1 or more) recording traces. The predetermined traveling speed when the recorded magnetic tape is caused to travel in the forward direction during the search operation and the predetermined traveling speed when the recorded magnetic tape is caused to travel in the reverse direction are defined by the above-described equations (1) to (4). The predetermined running speed was calculated by the corresponding one.

As described above, in the magnetic recording / reproducing apparatus of the present invention, the running speed of the recorded magnetic tape during the high-speed search operation is set to the above-mentioned specific running speed, whereby the pilot signal having the frequency f0 → frequency Is a pilot signal of f1 → a pilot signal of frequency f0 → a pilot signal of frequency f2 → a pilot signal of frequency f0 → a pilot signal of frequency f1 → a pilot signal of frequency f0. The arrangement state of the pilot sample signal used in the tracking control operation in the ATF circuit 4 performed by the ATF system in which the arrangement state of the recorded pilot signal is in an arrangement state in which the recording signal circles every four recording traces is recorded. Running at the same running speed as the running speed of the magnetic tape during recording operation Was only satisfactory tracking control operation different to a predetermined manner with respect to the period of the pilot sample signal used in the tracking control operation in the ATF circuit 4 in a state in which is the performed.

[0065]

As is apparent from the above description, the magnetic recording / reproducing apparatus of the present invention performs a predetermined number of 4N (however, at the time of a high-speed search operation performed by running the recorded magnetic tape T in the forward direction). , N is an integer of 1 or more), and digital data based on one frame of image information divided so as to correspond to recording traces of the first and second positions are arranged at 180-degree symmetrical positions with respect to the center axis of the drum as a symmetry center. The recorded magnetic tape recorded by the multi-segment helical scan type magnetic recording / reproducing apparatus by the second rotating magnetic head is compared with the traveling speed V during the recording operation by (4N × M + 1) V (where M Is an integer greater than or equal to 1). The traveling speed represented by (1) is set as a predetermined traveling speed,
Alternatively, digital data of one frame of image information divided so as to correspond to a predetermined number 4N + 2 (where N is an integer equal to or more than 1) of 180 degrees symmetrical with respect to the center axis of the drum as symmetry center. The first and second
回 転 (4N + 2) × 2M + 1｝ V (where M is an integer) with respect to the traveling speed V during the recording operation. Is an integer equal to or greater than 1. The traveling speed indicated by (2) is set to a predetermined traveling speed, and at the time of a high-speed search operation performed by running a recorded magnetic tape in the reverse direction, a predetermined number 4N (however, N
(1 is an integer of 1 or more). Digital data based on one frame of image information divided so as to correspond to the recording trace of 1 or 2 is disposed at 180 ° symmetrical positions with respect to the center axis of the drum as a symmetrical center. (4N × M−1) V (where M is the number of rotations) of the recorded magnetic tape recorded by the helical scan type magnetic recording / reproducing apparatus of the multi-segment system with the rotating magnetic head. Is an integer greater than or equal to 1). The traveling speed represented by (3) is taken as a predetermined traveling speed,
Alternatively, digital data of one frame of image information divided so as to correspond to a predetermined number 4N + 2 (where N is an integer equal to or more than 1) of 180 degrees symmetrical with respect to the center axis of the drum as symmetry center. The first and second
回 転 (4N + 2) × 2M-1｝ V (provided that the recorded magnetic tape recorded by the helical scan type magnetic recording / reproducing apparatus of the multi-segment system with the rotating magnetic head) , M is an integer of 1 or more) (4) The traveling speed indicated by (4) is set as the predetermined traveling speed, and the angle between the rotation locus of the rotary magnetic head H and the reference edge of the magnetic tape is always set to a predetermined value. By performing control so as to match the track angle, a high-speed search image having good image content can be reproduced, and the conventional problem described above by the present invention can be satisfactorily solved.

[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 block diagram of components of a magnetic recording / reproducing apparatus.

FIG. 3 is a view showing the relationship between the reference edge of the magnetic tape and the rotation trajectory of the rotary magnetic head even when the running state of the magnetic tape changes; FIG. 4 is a diagram for explaining a configuration example of a mechanism used to adjust and change the rotation trajectory of FIG.

FIG. 4 adjusts the rotation trajectory of the rotary magnetic head so that the angle formed between the reference edge of the magnetic tape and the rotation trajectory of the rotary magnetic head matches a specific track angle even when the running speed of the magnetic tape changes. It is a perspective view of a part of example of composition of a mechanism used for changing.

FIG. 5 is a diagram showing a rotation locus of a rotating magnetic head and a recording trace pattern during a variable speed reproduction operation.

FIG. 6 is a diagram showing a rotation locus of a rotating magnetic head and a recording trace pattern during a high-speed reproduction operation in the magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a diagram illustrating a relationship between a rotation locus of a rotary magnetic head, a recording trace pattern, and a reproduced image on a display surface of a display device.

FIG. 8 is an explanatory diagram of a reproduced image reproduced on a display surface of a display device.

FIG. 9 is a diagram showing the relationship between the number of recording traces in one frame and the number of double speeds.

FIG. 10 is a diagram showing a relationship between the number of recording traces of one frame and the number of double speeds.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input terminal of the signal to be recorded, 2 ... Output terminal of a reproduction signal, 3 ... Signal processing circuit of recording system and reproduction system, 4
... ATF circuit, 5 ... Main control unit, 6 ... Addition circuit, 7 ... Head switching circuit, 8 ... Drum inclination control unit, 9 ... Timing control circuit, 11 ... Capstan motor, 12 ... Center axis of drum assembly DA, 14 ... Incline drive motor, 15, 16 ... Reduction mechanism consisting of a plurality of gears, 17 ... Rotary encoder, 18 ... Position detector (preset sensor), 20-2
Reference numeral 3 denotes a rotation fulcrum, 30 denotes a drum motor, 31 denotes a drum control circuit, 32 denotes a control system (capstan control system) for a running speed and a running phase of a magnetic tape, 33p: capstan, 3
3c: pinch roller, 34: addition circuit, 35: drive circuit, 36: frequency-voltage converter, 37: frequency divider circuit, 38
.., A band-pass filter for extracting a pilot signal having a frequency of f1, 39, a band-pass filter for extracting a pilot signal having a frequency of f2, 40, 41, a detection circuit, 42, a subtraction circuit, 43, a timing generation circuit, 44 ... Sample hold circuit, DB ... Drum base, T ... Magnetic tape, DA ...
Drum structure, Du: upper drum, Dd: lower drum, Lr ...
Lead ring, G: Lead ring guide, H: Rotating magnetic head, Te: Reference edge of magnetic tape T,

Claims (4)

[Claims] A digital signal based on a main signal such as one frame of image information and audio information divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording traces has a frequency of f1. And a pilot signal having a frequency of f2 are superimposed on a recording signal obtained by superimposing a tracking pilot signal of the ATF system in which recording signals are alternately recorded at every other recording trace. A first rotating magnetic head having a magnetic air gap and a second rotating magnetic head having a magnetic air gap having a second azimuth angle are disposed at 180-degree symmetrical positions about the center axis of the drum. The vehicle travels at a traveling speed V while being wound around a part of the peripheral surface of both an upper drum rotating at a predetermined rotation speed and a lower drum provided coaxially with the upper drum. Magnetic tape The recording magnetic tape recorded by the multi-segment helical scan type magnetic recording / reproducing apparatus of the multi-segment type, which is recorded by the first and second rotating magnetic heads, is moved to the traveling speed V during the recording operation.
At a running speed indicated as (4N × M + 1) V (where M is an integer of 1 or more) and in the same running direction as that during the recording operation. Means for rotating the head in the same direction of rotation as in the above-mentioned recording operation at the same predetermined number of revolutions, and the rotation trajectory of the first and second rotating magnetic heads is used to determine the recording trace of the recorded magnetic tape. A magnetic device comprising: means for making the track parallel to the longitudinal direction; and means for performing tracking control by changing the running speed of the recorded magnetic tape based on an ATF tracking pilot signal reproduced from the recorded magnetic tape. Recording and playback device. 2. A digital signal of a main signal such as image information and audio information of one frame divided so as to correspond to a predetermined number 4N (where N is an integer of 1 or more) of recording traces has a frequency of f1. And a pilot signal having a frequency of f2 are superimposed on a recording signal obtained by superimposing a tracking pilot signal of the ATF system in which recording signals are alternately recorded at every other recording trace. A first rotating magnetic head having a magnetic air gap and a second rotating magnetic head having a magnetic air gap having a second azimuth angle are disposed at 180-degree symmetrical positions about the center axis of the drum. The vehicle travels at a traveling speed V while being wound around a part of the peripheral surface of both an upper drum rotating at a predetermined rotation speed and a lower drum provided coaxially with the upper drum. Magnetic tape The recording magnetic tape recorded by the multi-segment helical scan type magnetic recording / reproducing apparatus of the multi-segment type, which is recorded by the first and second rotating magnetic heads, is moved to the traveling speed V during the recording operation.
On the other hand, at the running speed indicated as (4N × M-1) V (where M is an integer of 1 or more) and in the running direction opposite to that during the recording operation, Means for rotating the rotating magnetic head at the same predetermined rotational speed in the same rotating direction as during the recording operation, and the rotation trajectories of the first and second rotating magnetic heads are recorded on the recorded magnetic tape. Means for making the recording track parallel to the longitudinal direction thereof, and means for performing tracking control by changing the running speed of the recorded magnetic tape based on an ATF tracking pilot signal reproduced from the recorded magnetic tape. Magnetic recording and reproducing apparatus. 3. A digital signal of a main signal such as one frame of image information and audio information divided so as to correspond to a predetermined number 4N + 2 (where N is an integer of 1 or more) recording traces has a frequency of f1. And the frequency is f2
A recording signal obtained by superimposing a tracking pilot signal of the ATF system in which the pilot signal is sequentially and alternately recorded at every other recording trace is converted to a first rotation having a magnetic gap of a first azimuth angle. A magnetic head and a second rotating magnetic head having a magnetic gap with a second azimuth angle are arranged at 180-degree symmetric positions about the center axis of the drum and are rotated at a predetermined rotation speed. The magnetic tape that runs at a running speed V while being wound around a part of the peripheral surface of both an upper drum and a lower drum that is provided coaxially with the upper drum, , The recorded magnetic tape recorded by the helical scan type magnetic recording / reproducing apparatus of the multi-segment system, which is recorded by the second rotating magnetic head, is shifted by ｛( N + 2) × 2M + 1} V (where
M is a traveling speed indicated as an integer of 1 or more), and
Means for running in the same running direction as during the recording operation, and rotating the first and second rotating magnetic heads in the same rotation direction and at the same predetermined number of revolutions as in the above-described recording operation; (1) means for making the rotation trajectory of the second rotating magnetic head parallel to the longitudinal direction of the recording mark on the recorded magnetic tape, and recording based on the ATF tracking pilot signal reproduced from the recorded magnetic tape. Means for performing tracking control by changing the running speed of a completed magnetic tape. 4. A digital signal based on a main signal such as one frame of image information and audio information divided so as to correspond to a predetermined number 4N + 2 (where N is an integer of 1 or more) recording traces has a frequency of f1. And the frequency is f2
A recording signal obtained by superimposing a tracking pilot signal of the ATF system in which the pilot signal is sequentially and alternately recorded at every other recording trace is converted to a first rotation having a magnetic gap of a first azimuth angle. A magnetic head and a second rotating magnetic head having a magnetic gap with a second azimuth angle are arranged at 180-degree symmetric positions about the center axis of the drum and are rotated at a predetermined rotation speed. The magnetic tape that runs at a running speed V while being wound around a part of the peripheral surface of both an upper drum and a lower drum that is provided coaxially with the upper drum, , The recorded magnetic tape recorded by the helical scan type magnetic recording / reproducing apparatus of the multi-segment system, which is recorded by the second rotating magnetic head, is shifted by ｛( N + 2) × 2M-1} V (where
M is a traveling speed indicated as an integer of 1 or more), and
While running in the opposite running direction to the recording operation,
Means for rotating the first and second rotating magnetic heads in the same rotation direction and at the same predetermined number of revolutions as during the recording operation, and the rotation trajectory of the first and second rotating magnetic heads The tracking control is performed by changing the running speed of the recorded magnetic tape based on the means for making the recording track of the recorded magnetic tape parallel to the longitudinal direction of the recording mark and the ATF tracking pilot signal reproduced from the recorded magnetic tape. A magnetic recording / reproducing apparatus comprising: