JP2762664B2 - Signal recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus of an apparatus for recording / reproducing a signal on / from a disk by means such as a laser.

2. Description of the Related Art In recent years, optical discs have high recording density, non-contact recording / reproduction has a long medium life, and random access is much faster than tapes and other media. Many proposals have been made, such as image files, data files, and document files for CDs, VLPs, and recording / playback machines. In the field of reproducing devices, a fairly large market has already been formed, and a very large market scale is expected with the practical use of recording and reproducing devices.

In terms of recording format, CDs and data files, etc., have various modulation methods, but are basically modulated and recorded in the form of digital signals handling 1,0, while VLPs and image files are recorded. The audio and video signals are FM-modulated and recorded in an analog form. However, recently a CDV that mixes a playback-only CD and a VLP
And the like, a mixed-type disc in which an audio signal that is digitally modulated on the inner periphery and an analog signal such as a video recorded on the outer periphery at a high linear velocity is realized.

Hereinafter, the above-described optical disk recording / reproducing apparatus and disk will be described using examples with reference to the drawings.

FIG. 4 shows a block diagram of an image file for recording and reproducing a video signal such as NTSC, and FIG. 5 shows a disk used for the image file.

As shown in FIG. 5, reference numeral 1 denotes a disk having a rotating mark 1a at a specific position such as an inner circumference or an outer circumference, and a recording surface thereof is pre-coated in a concentric or spiral shape at a pitch of about 1.6 μm. Guide grooves called grooves are recorded in advance, on which is formed a protective film of 1-2 mm resin or the like for protecting the recording surface is a form of a general recording disk, In each track, at least one signal indicating the position of each track, called an address including a synchronization signal, is recorded at least in one rotation of each track. As shown in FIGS. Can be recognized from the surface. The numerical values of the track pitch, the rotation mark 1a per rotation, the addresses 1b, 1c, and the like differ depending on the method, and the track form is not continuous, but is recorded in the form of pits called a sample format, or the recording film. Although the material of the above-mentioned method differs depending on the method, it will not be described in detail here. In this example, a description will be given of a disk in which the number of signals is relatively small, such as one rotation mark for one rotation and one or two addresses for one rotation.

Reference numeral 2 denotes a turntable, which is a fixed table for rotating one disk stably by a third disk motor. Reference numeral 4 denotes a rotation speed detector which outputs a frequency proportional to the rotation speed of the disk motor. here,
An example in which a rotation detector of a disk motor is used will be described. The same applies to a rotation detection signal from a disk provided with a plurality of rotation marks. Reference numeral 5 denotes a motor control circuit, which is input to the disk motor 3 and operates to rotate the disk at a predetermined rotation speed. In the NTSC system of this example, the rotation is generally performed at 1800 rpm, and the rotation is generally controlled to record one TV frame per rotation.

Reference numeral 6 denotes a rotation mark detector, which detects a pulse per rotation of the disk by using a reflection type photo sensor or the like for the rotation mark 1a recorded at a specific position on the disk, and detects the rotation mark 1a with the motor control circuit. Are input to the command circuit 21 as needed.

The video signal input from the external input terminal of the device I is
The signals are input to the motor control circuit 5 and the modulation circuit 7 described above. The synchronization signal is separated inside the motor control circuit, the phase reference of rotation is generated, the phase is compared with the output of the above-mentioned rotation mark detector, and the recording TV signal on the disc is compared with the above-mentioned rotation mark and address signal. The rotation of the motor 3 is controlled so as to be recorded in a fixed relationship.

Reference numeral 7 denotes a modulation circuit, which modulates FM according to the input TV signal.
After processing such as modulation, the laser 10 is supplied to the laser drive circuit 8 and mounted on the head 9 to drive the laser 10 in the form of light emission intensity modulation and the like.
Signals are recorded on the recording surface of the disk by forming holes in micron units called pits, or by applying a vertical magnetic field (not shown) to perform magneto-optical modulation. Does not matter.

11 is a photodetector, a focused laser beam 15 for recording and reproduction, a focus control circuit 17 for accurately following the recording surface, and accurately follow the pre-groove,
The tracking coil is supplied to a tracking control circuit 18 to drive the focus coil 12 for following the surface deviation of the objective lens 14 and the tracking coil 13 for following the eccentricity, thereby stabilizing recording and reproduction.

There are various detection systems and drive systems for both the focus and tracking control circuits, but these systems do not matter here.

The photodetector 11 detects the recorded signal from the reflected light from the disk, and is supplied to the demodulation circuit 20 to convert the FM signal recorded on the disk into a TV signal again. It is reproduced and output to the output terminal of 0. In the demodulation circuit 20, an address signal indicating the position on the disk is also demodulated and supplied to the command circuit 21.

Numeral 16 is a head feed means such as a linear motor for driving the above-mentioned head in the radial direction of the disk, and performs a track following operation in cooperation with the above-mentioned tracking control circuit, and if necessary, a track to be recorded / reproduced. In addition, a feed control circuit 19 for moving the head quickly is configured.

Reference numeral 21 denotes a command circuit such as a microcomputer which receives a command such as a program from the computer through the external communication terminal INT and turns on the above-described motor control circuit, laser drive circuit, focus control circuit, tracking control circuit, feed control circuit, and the like. / OFF, random access for moving the head to a desired position at a high speed, and the like. In a device for recording and reproducing digital signals such as data files and document files, the basic configuration is almost the same, but the configuration of the above-described modulation circuit and demodulation circuit is
It differs depending on each recording method.

However, in the configuration described above, a device that records analog signals such as video and audio is different from a device that records digital signals such as programs and data. It was difficult to record signals and digital signals. In addition, a system that incorporates both modulation circuits into the device, and a dedicated read-only unit that performs digital modulation in the region of low inner linear velocity, such as CDV, and analog modulation in the region of higher outer linear velocity, such as CDV. A method for recording a video signal as shown in FIG. 6 has been proposed.

In FIG. 6, analog signals are indicated by solid lines, and digital signals are indicated by broken lines. As shown in FIG. 6, the areas of the analog signal and the digital signal are determined, and it has been difficult to record both signals as effectively as possible.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a method for maximizing the use of a disc, whether the signal is an analog signal, a digital signal, or a mixture of both signals.

Means for Solving the Problems In order to solve the above problems, a recording / reproducing apparatus of the present invention comprises an analog signal recording circuit and a digital signal recording circuit, both recording circuits, and the analog signal is transmitted in a spiral direction of the disk. The tracking control circuit, the laser driving circuit, and the modulation / demodulation circuit are controlled so that the digital signal is recorded in the direction opposite to the spiral of the disk. Alternatively, the continuous recording signal is recorded in the spiral direction of the disk, and the divisible recording signal is recorded in the direction opposite to the spiral of the disk.

The direction opposite to the spiral refers to, for example, when a number (track address) is provided on a track in a direction in which the number increases from the innermost circumference to the outer circumference, an information signal is recorded on the track in a direction in which the number decreases. Means to go.

Operation The present invention utilizes the fact that the recording of digital signals is temporarily stored in the memory means and is recorded intermittently by means of the above-described configuration, and recording is performed by dividing one track at a time in a direction opposite to the spiral of the disk. The data is recorded in a direction according to the spiral of the disk without sacrificing continuity. This makes it possible to maximize the entire area of the disk without fixing the respective capacities of the analog signal and the digital signal.

Examples Hereinafter, recording and reproduction according to the present invention will be described with reference to the drawings of the examples.

FIG. 1 is a block diagram showing an apparatus according to a first embodiment of the present invention.

Components having the same configuration as the conventional example in FIG. 4 are denoted by the same reference numerals, and detailed description will not be given.

1 is a disk, 2 is mounted on a turntable, and is rotated by a 3 disk motor. 4 is FG
And outputs a frequency proportional to the rotation speed of the disk motor.

Reference numeral 5 denotes a disk motor control circuit, which is provided with a speed control by the above-described FG, and includes a rotation mark detector 6 and a circuit which performs phase control by a synchronization signal of a signal input to an analog signal modulation circuit 7. The rotation of the three disk motors is controlled while maintaining the speed and phase relationship required for recording analog signals.

Reference numeral 8 denotes a laser driving circuit which controls the driving of ten lasers mounted on the head 9 by the output of a recording signal switching circuit 26 described later.

Reference numeral 11 denotes a photodetector, which is input to a focus control circuit 17, a tracking control circuit 18, an analog signal demodulation circuit 20, and a digital signal demodulation circuit 27.

Reference numeral 12 denotes a focus drive coil, and 13 denotes a tracking drive coil. The drive light is controlled by the focus control circuit and the tracking control circuit so that the laser beam 15 exiting from the objective lens 14 accurately follows a desired track. I have.

Reference numeral 16 denotes a feed mechanism such as a linear motor for moving the entire head 9 at a high speed in the radial direction of the disk by a feed control circuit 19.

Reference numeral 21 denotes a first command circuit such as a microcomputer, and an external communication terminal INT input to a second command circuit 22.
A signal that receives a program or other command from an external computer or the like is sent through the controller to turn on / off the motor control circuit, laser drive circuit, focus control circuit, tracking control circuit, feed control circuit, etc. Control such as random access for moving to a desired position at high speed is performed.

Reference numeral 23 denotes a memory circuit which temporarily stores programs, data, and the like received by the second command circuit 22.
When a digital signal is reproduced, the output of a digital signal demodulation circuit 27, which will be described later, is transmitted through a second command circuit 22.
Is temporarily stored in the memory of the
Output to an external computer or the like.

Reference numeral 24 denotes a buffer circuit, which stores the contents of the memory in units of one track of the disk or a half track equivalent thereto, and sequentially inputs the contents to 25 digital signal modulation circuits as needed.

This signal passes through 26 recording signal switching circuits and
And recorded on the disk in the same procedure as the analog signal. The difference from this analog signal recording is that the analog signal is recorded continuously in the spiral direction of the track, whereas the digital signal is the reverse of the spiral one track at a time from the outermost circumference or the innermost circumference of the analog signal. In the first and second command circuits 21 and 22, the above-described tracking control circuit,
The point is that a feed control circuit, a laser drive circuit, a recording signal switching circuit, and the like are controlled.

Reference numeral 26 denotes a recording signal switching circuit for switching a signal supplied to the laser driving circuit between an output of an analog signal modulation circuit and an output of a digital signal modulation circuit by a first command circuit.

Reference numeral 27 denotes a digital signal demodulation circuit. In the case of a digital signal, the signal is demodulated immediately after being recorded in one track or a unit equivalent thereto. Is performed, the contents of the buffer circuit 24 are rewritten to the contents of the next track supplied from the memory circuit 23, and the track is jumped to the inner circumference of one track from the previously recorded track. After that, recording is performed, and the recording, verification, and track jump are repeated until the contents of the memory 23 are all recorded.

Reference numeral 28 denotes a mute circuit, which may temporarily stop the output of an analog signal during recording or reproduction of a digital signal, or may be an image memory for outputting the immediately preceding signal.

The signal exchange between the first command circuit of FIG. 21 and each component is briefly described.

A pulse is supplied once per rotation from the rotation mark detector 6 as needed to generate a track jump timing, a recording start timing, an address reading timing, and the like.

A switching signal for recording / reproduction or output stop is output to the laser drive circuit 8, and a laser abnormality detection signal is input to the first command circuit 21 as needed.

Loop ON / OFF for 17 focus control circuits
The signal and, if necessary, a loop abnormality detection signal are exchanged.

Loop ON / O for 18 tracking control circuits
FF and a track jump command are output. In particular, when a digital signal is recorded, recording is performed by verifying by a back jump of one track, locating a recording position by a back jump of two tracks, and by continuous reproduction of a two track back jump during reproduction. A jump command is output so that the digital signal can be reproduced smoothly. Further, a loop abnormality detection signal is exchanged as needed.

A random access command for turning on / off the loop and accessing a desired track is output to the feed control circuit 19.

From the analog signal demodulation circuit 20 and the digital signal demodulation circuit 27, address information and the like of the currently reproduced track are output. From the 27 digital signal demodulation circuits, information called a sector obtained by dividing one track into about 10 to 30 is also output at the same time.

Signals corresponding to the current mode are exchanged with the second command circuit 22 and signals such as a communication state with the outside, a recording state, a reproduction state, and a verify state are exchanged. By the first and second command circuits,
The entire device is controlled to operate smoothly.

The second command circuit 22 also outputs the address control of the memory 23 and the timing control signal of the buffer circuit 24.

Next, with reference to FIG. 2, an outline of a signal arrangement on a disk recorded by the apparatus described with reference to FIG. 1 will be described.

A rotation mark such as 1a, 1b, 1
Addresses such as c are recorded together with the pregroove forming the track. The pattern can be visually confirmed under the influence of diffraction. Here, the rotation mark 1a does not have to be recorded in advance if it is not required by the apparatus. Also, the number of address signals 1b, 1c, etc. per rotation is not limited to two. Absent.

In FIG. 2, A1, A2, A3... Indicated by solid lines indicate states where analog signals such as video signals and audio signals are recorded, and recording and reproduction can be continuously performed along the spiral direction. It has become.

The signals indicated by broken lines such as D01, D02,... And D11, D12, D13,. Here, for example, D01, D02,... Are used as index areas for recording management information of the entire disk such as an analog signal area and its name on the disk, a digital signal area and its name, and information indicating whether it is a program or data. It is configured to be.

The signals indicated by D11, D12, D13,... May be program information for branching according to the order in which the analog signals are reproduced or operating conditions, or a signal of a computer connected to the outside. May be a program or data. In addition, by changing the start position of the analog signal, D01, D02 ...
It is also possible to record digital signals such as programs and data. In the disk configured in this way, it is not necessary to determine the areas of the analog signal and the digital signal in advance, and the analog signal indicated by A1, A2, A3...
It is possible to make the best use of the entire disc until just before the digital signals indicated by D12, D13... Finally overlap.

As described above, according to the present embodiment, for example, in the case of a disc having a diameter of 30 cm, a moving image of 30 minutes and 100 MB of digital information, a moving image of 20 minutes and 1 GB of digital information, and a moving image of 10 minutes and 2 GB
A recording / reproducing device that allows free combinations such as using GB digital information or the whole as a 3GB digital information recording medium, and making it almost unnecessary for users to be aware of the recording divisions of analog and digital signals. In addition, a recording / reproducing medium can be provided.

Next, the outline of the signal arrangement on the disk of the second embodiment will be described with reference to FIG.

FIG. 3 divides a disk into a plurality of areas to determine the areas of analog signals and digital signals to some extent,
This is an example in which the distribution of the analog signal and the digital signal in the area can be freely determined.

As in FIG. 2, analog signals are indicated by solid lines, and digital signals are indicated by broken lines.

In this example, the disc is divided into two areas. However, it is sufficiently possible to divide the disc into more areas in the same manner.

Analog signals in each area are A11, A12, A13 ……, A
Along the spiral direction of the disc, such as 21, A22, A23 ...
Digital signals are D01, D02 ..., D11, D12 ..., D21, D22
... Are recorded in the direction opposite to the spiral of the disk.

By dividing the disc into a plurality of pieces in this way, a disc having a large recording capacity can be used by a plurality of persons, a plurality of video signals and their control programs, and the main video information in the area can be digitized to produce a digital still image. It can be easily stored as

Here, the division information is recorded in the innermost area D01, D02... Together with the management information described with reference to FIG. 2 as disc management information.

As described above, the analog signal is recorded along the spiral of the disk, and the digital signal is recorded in the opposite direction to the spiral of the disk, without sacrificing continuity, which is an important property of the analog signal. The disk can be used to the maximum without fixing the area of the signal and the digital signal. Furthermore, by dividing a large-capacity disc into multiple parts, it is possible to clarify the relationship between analog and digital signals, to be used by multiple people, or to record multiple analog programs on a single disk. However, the control program and digital information obtained by digitizing the main video and audio signals can be recorded in each area in comparison with the analog signal, and the combination of the analog signal and the digital signal at the time of reproduction is extremely high. It can be easily done. Further, each of the plurality of areas can be used exclusively for analog signals and digital signals. Recording of analog signals and digital signals on a single disk can be performed while realizing division as required by the user. It is an interactive interactive simulation device using a computer, a moving image and a still image recording and reproducing device using computer graphics,
It is possible to provide an optimal system as a medium. This is because the analog signal is generally a continuous recording signal, and the digital signal is generally a recording signal that can be divided by using memory means. Therefore, it is needless to say that the present invention can achieve the effects of the present invention even when recording a continuous recording signal and a recording signal that can be divided.

Although FIG. 1 shows the first and second command circuits 21 and 22 as the first and second command circuits, it is sufficiently possible to combine them into one command circuit or to divide each function so as to have more command circuits. Things.

Further, it is also possible to substitute the rotation mark, FG, and the like described in FIG. 1 with a signal recorded on a track of a disk.

Furthermore, in the present embodiment, the description has been made using a recording medium that does not require a magnetic field, but a catalyst using a method such as magneto-optics may be used.

Further, in this embodiment, a device and a medium capable of recording / reproducing have been described. However, the present invention can be applied to a read-only ROM disk or the like.

As described above, the recording / reproducing apparatus of the present invention has both an analog signal recording circuit and a digital signal recording circuit, and the analog signal is in the spiral direction of the disk and the digital signal is in the opposite direction to the spiral of the disk. A tracking control circuit, a laser drive circuit, and a signal modulation / demodulation circuit for controlling the recording and the demodulation of the signal, so that the recording of the digital signal is temporarily stored in the memory means and recorded intermittently. The spiral is recorded in a direction opposite to that of the spiral, and the analog signal is recorded in the direction corresponding to the spiral of the disk so as not to sacrifice the continuity of the signal. Allows you to make full use of the entire disk space without fixing the capacity Things. This is because the analog signal is generally a continuous recording signal, and the digital signal is generally a recording signal that can be divided via memory means. Therefore, it is needless to say that the present invention can achieve the effects of the present invention even when recording a continuous recording signal and a recording signal that can be divided.

In addition, a large-capacity disc is divided into a plurality of areas, and the combination of analog and digital signals described above is freely used in each area. Devices that can handle groups of analog and digital information very easily.
And a medium.

[Brief description of the drawings]

FIG. 1 is a block diagram of a signal recording / reproducing apparatus according to a first embodiment of the present invention, and FIG.
FIG. 3 is a schematic plan view of a disk in the second embodiment, FIG. 4 is a block diagram of a conventional example, FIG. 5 is a schematic plan view of a conventional disk, FIG. 6 is a schematic plan view showing another conventional disk. 1 ... disk 2 ... turntable 3 ... disk motor 4 ... FG 5 ... disk motor control circuit
6 ... rotation mark detector, 7 ... analog signal modulation circuit, 8 ... laser drive circuit, 9 ... head, 10 ... laser, 11 ... photodetector, 12 ... focus drive coil, 13
…… Tracking drive coil, 14 …… Objective lens, 15…
... Laser light, 16 ... Linear motor, 17 ... Focus control circuit, 18 ... Tracking control circuit, 19 ... Feed control circuit, 20 ... Analog signal demodulation circuit, 21 ... First command circuit, 22 ... ... second command circuit, 23 ... memory, 24 ... buffer circuit, 25 ... digital signal modulation circuit, 26 ... recording signal switching circuit, 27 ... digital signal demodulation circuit
28: Mute circuit, 1a: Rotation mark signal section, 1b, 1c
… Address signal section, A1, A2… Analog signal recording tracks, A11, A12… Analog signal recording tracks, A21, A22
... Analog signal recording track, D01, D02 ... Digital signal recording track, D11, D12 ... Digital signal recording track, D21, D22 ... Digital signal recording track.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-76153 (JP, A) JP-A-2-118969 (JP, A) JP-A-62-245574 (JP, A) (58) Investigation Field (Int.Cl. ⁶ , DB name) G11B 20/00 G11B 7/00-7/007

Claims (3)

(57) [Claims] 1. A disk having a spiral pre-groove, rotating means for rotating the disk, head means for recording a signal on or reproducing a signal from the disk, and a first signal which is a continuous recording signal A first signal modulating means for modulating a signal, a memory means for temporarily storing a second signal, which is a recordable signal which can be divided, a second signal modulating means for modulating an output of the memory means, and the head means. Light source control means for controlling a light source such as a laser, feed control means for driving and controlling the head means in the radial direction of the disk, focus control means for narrowing the light source to the recording surface of the disk, and narrowing down to a pregroove of the disk Tracking means for following the reflected light flux,
A first signal is recorded using the first signal modulation means and the light source control means in a direction corresponding to the spiral of the disk, and the second signal modulation means and the light source control are recorded in a direction opposite to the spiral of the disk. Second using means
A signal recording / reproducing apparatus for recording a signal of 2. A disk having a spiral pregroove, a rotating means for rotating the disk, a head means for recording a signal on or reproducing a signal from the disk, and an analog signal such as an audio or video signal. Analog signal modulating means for modulating, memory means for temporarily storing digital signals such as data, digital modulating means for modulating the output of the memory means, and light source controlling means for controlling a light source such as a laser incorporated in the head means Feed control means for driving and controlling the head means in the radial direction of the disk, focus control means for narrowing the light source to the recording surface of the disk, and tracking means for following a light beam narrowed to a pre-groove of the disk. Have
An analog signal is recorded using the analog modulation means and the light source control means in a direction corresponding to the spiral of the disk, and a digital signal is formed using the digital modulation means and the light source control means in a direction opposite to the spiral of the disk. A signal recording / reproducing apparatus for recording a signal. 3. The disk is divided into two or more areas in a radial direction, and an analog signal is recorded in a direction similar to a spiral from each of the division points, and a digital signal is recorded in a direction opposite to the spiral. The signal recording / reproducing apparatus according to claim 1, wherein: