JPH03273567A - Signal recording and reproducing device and signal recording medium - Google Patents

Abstract

PURPOSE:To make the most of all the areas of a disk by providing and analog signal recording circuit and a digital signal recording circuit and controlling analog signals in the spiral direction of the disk. CONSTITUTION:The both recording circuits of the analog signal recording circuit and the digital signal recording circuit are provided and a tracking control circuit 18, laser driving circuit 8, modulation and demodulation circuits 7, 25, 20 and 27 are controlled so that the analog signals can be recorded in the spiral direction of a disk 1 and digital signals can recorded reversely in the spiral direction of the disk 1. By utilizing the fact of temporarily storing the digital signals in a memory means 23 and intermittently recording those signals, the digital signals are recorded while being divided into one track reversely in the spiral direction of the disk 1 and the analog signals are recorded in the spiral direction of the disk 1 so that the continuity of the signals can not be damaged. Thus, all the areas of the disk can be utilized at its maximum without fixing capacity respectively for the analog and digital signals.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal recording method for a device that records and reproduces signals on a disk using means such as a laser.

Conventional technology In recent years, optical disks have been developed as playback-only devices because of their high recording density, long lifespan due to non-contact recording and playback, and much faster random access than tape or other media. , CD, VLP, image files, data files, document files, etc. as recording and reproducing devices have been proposed. In the field of playback devices, a fairly large market has already been formed, and a very large market size is expected with the practical use of recording and playback devices.

In terms of recording format, although there are various modulation methods for CDs, data files, etc., they are basically modulated and recorded in the form of a digital signal that handles 1.0, while VLPs, image files, etc. , audio and video signals to FM
By modulating it, it is modulated into analog form and recorded.

However, recently, CDs that are a mix of playback-only CDs and VLPs
Mixed type discs have also been realized in which digitally modulated audio signals are recorded on the inner periphery and analog signals such as video are recorded on the outer periphery where the linear velocity is faster.

The above-mentioned optical disc recording/reproducing machine and disc will be described below using examples with reference to the drawings.

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

1 is a disk, and as shown in FIG. 5, it has a rotation mark 1a at a specific position such as the inner circumference or outer circumference, and the recording surface has a concentric or spiral pattern with a pitch of about 1.6 μm. A guide groove called a pre-groove is recorded in advance on the disc, and on top of that, there are 1 to 2 grooves to protect the recording surface.
A typical recording disk has a protective film made of resin, etc., and each track has a signal indicating the position of each track called an address that includes a synchronization signal. More than one pattern is recorded in each rotation, and can be recognized from the surface as a diffraction pattern like lb and lc shown in FIG.

Track pitch, - revolution mark per revolution la.

Numerical values such as address lb and IC differ depending on the method.
In addition, the track format is not continuous, but is recorded in a bit format called sample format, etc.
The material of the recording film also differs depending on the method, but will not be discussed in detail here. In this example, a disc will be described in which the number of signals is relatively small, such as the rotation mark at one location per revolution and the address at one or two locations per revolution.

2 is a turntable, which is a fixed table for stably rotating the disk 1 by the disk motor 3. 4 is an FG, which is a rotation speed detector that outputs a frequency proportional to the rotation speed of the disk motor. here,
Although an example is shown in which a rotation detector of a disk motor is used, the same applies to a rotation detection signal from a disk provided with a plurality of rotation marks as described above. 5 is a motor control circuit, which is inputted to the disk motor 3 and operates to rotate the disk at a predetermined number of rotations. In the NTSC system of this example, the rotation is generally rotated at 180 rpm, and the rotation is normally controlled so that ITV frames are recorded in the rotation.

Reference numeral 6 denotes a rotation mark detector, which detects the aforementioned rotation mark 1a recorded at a specific position on the disk using a reflective photosensor or the like to detect the pulse of one rotation of the disk, and connects it to the aforementioned motor control circuit. , are input to the command circuit 21 as necessary.

The video signal inputted from the apparatus external input terminal (2) is inputted to the above-mentioned motor control circuit 5 and modulation circuit 7.

Inside the motor control circuit, a synchronizing signal is separated, a rotational phase reference is generated, and the phase is compared with the output of the rotational mark detector mentioned above. The rotation of the motor 3 is controlled so that the data is recorded in a constant relationship.

7 is a modulation circuit, which adjusts F according to the input TV signal.
After processing such as M modulation, it is supplied to the laser drive circuit 8, which drives the laser 10 mounted on the head 9 in a format such as emission intensity modulation, and records phase change, bits, etc. on the disk 1. Hole formation in microns, called
Although not shown in the figure, signals are recorded on the recording surface of the disk by applying a perpendicular magnetic field and performing magneto-optical modulation, but any method may be used here.

Reference numeral 11 denotes a photodetector, which includes a focus control circuit 17 that causes the focused laser beam 15 for recording and reproduction to accurately follow the aforementioned recording surface, and a tracking control circuit 18 that causes it to accurately follow the pregroove. A focus coil 1 is supplied for causing the objective lens 14 to follow the surface vibration.
2. The tracking coil 13 for tracking eccentricity is driven to stabilize recording and reproduction.

The detection method of this focus and tracking control circuit,
There are various driving methods, but the method is not in question here.

The photodetector 11 is for detecting the recorded signal from the reflected light from the disc, and is supplied to the demodulation circuit 20, which converts the FM signal recorded on the disc into a TV signal again. It is reproduced and output to the output terminal of O. Further, the demodulation circuit 20 also demodulates an address signal indicating the position on the disk, and supplies it to the command circuit 21.

Reference numeral 16 denotes a head feeding means such as a near motor for driving the aforementioned head in the radial direction of the disk, and performs track following operation in cooperation with the aforementioned tracking control circuit, and performs recording and reproduction as necessary. A feed control circuit 19 is configured to quickly move the head to the desired track.

Reference numeral 21 denotes a command circuit such as a microcomputer, which receives commands such as programs from the computer through an external communication terminal INT, and includes the aforementioned motor control circuit, laser drive circuit, and focus control circuit.

0N1OFF of tracking control circuit, feed control circuit, etc.
It performs control such as random access to move the head to a desired position at high speed.

The basic configurations of devices that record and reproduce digital signals such as data files and document files are almost the same, but the configurations of the modulation circuits and demodulation circuits mentioned above differ depending on each recording method. There is.

Problems to be Solved by the Invention However, in the above-described configuration, the device for recording analog signals such as video and audio is different from the device for recording digital signals such as programs and data. It was difficult to record signals and digital signals. In addition, there are systems that incorporate both modulation circuits into the device, and playback-only equipment that uses digitally modulated audio in the inner linear velocity region, such as CDV, and analog modulated audio in the outer peripheral linear velocity region. As a method for recording video signals, a method as shown in FIG. 6 has been proposed.

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

In view of the above-mentioned problems, the present invention provides a method for maximizing the use of a single disk even when the disk is used for analog signals, digital signals, or a mixture of both signals.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention includes both an analog signal recording circuit and a digital signal recording circuit, and the analog signal is sent in the spiral direction of the disk. , the above-mentioned tracking control circuit, laser drive circuit, modulation and demodulation circuit are controlled so that the digital signal is recorded in the direction opposite to the spiral direction of the disk.

Note that the direction opposite to the spiral means that, for example, if numbers (track addresses) are provided on tracks in the direction in which the numbers increase from the innermost circumference to the outer circumference, information signals are recorded on the tracks in the direction in which the numbers decrease. It means to go.

Effect of the Invention The present invention utilizes the fact that the recording of digital signals is temporarily stored in the memory means and recorded intermittently by the above-described configuration, and records the analog signals by dividing them into tracks in the opposite direction of the spiral of the disk. Recording is performed in a direction similar to the spiral of the disc so as not to sacrifice continuity. This makes it possible to make maximum use of the entire area of the disk without fixing the capacity of each of the analog and digital signals.

EMBODIMENTS Recording and reproduction of the present invention will be described below with reference to drawings of embodiments.

FIG. 1 shows a block diagram of an apparatus in a first embodiment of the invention.

Components having the same configuration as the conventional example shown in FIG. 4 are given the same numbers and will not be described in detail.

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

Reference numeral 5 denotes a disk motor control circuit, which includes a circuit that performs speed control by the above-mentioned FG, and a circuit that performs phase control based on a synchronization signal of the signal input to the rotation mark detector 6 and the analog signal modulation circuit 7. , and controls the rotation of the disk motor 3 while maintaining the speed and phase relationship necessary for recording analog signals.

Reference numeral 8 is a laser drive circuit, and the output of 26 recording signal switching circuits, which will be described later, causes 10 to be mounted on the head 9.
drive and control the laser.

11 is a photodetector, 17 is a focus control circuit, 18 is a photodetector;
The signal is input to a tracking control circuit 20, an analog signal demodulation circuit 20, and a digital signal demodulation circuit 27, respectively.

Reference numeral 12 indicates a focus drive coil, and reference numeral 13 indicates a tracking drive coil, which are drive-controlled by the aforementioned focus control circuit and tracking control circuit so that the laser beam 15 exiting from the objective lens 14 accurately follows a desired track. There is.

Reference numeral 16 denotes a feed mechanism such as a linear motor, which is used to move the entire head 9 in the radial direction of the disk at high speed by means of a feed control circuit 19.

21 is a first command circuit such as a microcomputer, and an external communication terminal I is input to a second command circuit 22.
A signal is sent through the NT to receive commands such as programs from an external convenience store, etc., and the aforementioned motor control circuit, laser drive circuit focus control circuit, tracking control circuit, feed control circuit, etc. are turned ON10F. , performs control such as random access to move the head to a desired position at high speed.

A memory circuit 23 temporarily stores programs, data, etc. received by the second command circuit 22. Further, when reproducing a digital signal, the output of a digital signal demodulation circuit 27 (described later) is temporarily stored in the memory 23 via the second command circuit 22, and the output is sent to the external communication terminal INT.
The data is output to an external computer, etc.

Reference numeral 24 denotes a buffer circuit, which stores the contents of the memory in units of one track or equivalent 1/2 track of the disk, and sequentially inputs the contents to the digital signal modulation circuit 25 as necessary.

This signal passes through 26 recording signal switching circuits and 8
The signal is input to the laser drive circuit and recorded on the disk using the same procedure as an analog signal. The difference from analog signal recording here is that analog signals are recorded continuously in the spiral direction of the track, whereas digital signals are recorded one track at a time from the outermost track or the innermost track of the analog signal. 21 and 2 to record in the opposite direction.
The point is that the above-mentioned tracking control circuit, feed control circuit, laser drive circuit recording signal switching circuit, etc. are controlled by the first and second command circuits of No. 2.

Reference numeral 26 denotes a recording signal switching circuit, which is used to switch the signal supplied to the laser drive circuit between the output of the analog signal modulation circuit and the output of the digital signal modulation circuit by the first command circuit.

27 is a digital signal demodulation circuit; in the case of a digital signal, it is demodulated immediately after being recorded in units of one track or equivalent, and the second command circuit 22 determines that the content is the same as that of the buffer circuit 24. After performing a verify operation referring to , the contents of the 24 buffer circuits are rewritten with the contents of the next track supplied from the memory circuit 23, and the track is further jumped one track inward from the previously recorded track. After that, recording is performed, and this recording, verification, and track jump are repeated until the entire contents of the memory 23 are recorded.

Reference numeral 28 denotes a mute circuit, which may be an image memory that temporarily stops the output of the analog signal or outputs the previous signal during recording or reproduction of the digital signal.

The exchange of signals between the first command circuit No. 21 and each component will be briefly described.

The rotation mark detector 6 supplies pulses once per rotation as necessary to generate track jump timing, recording start timing, address reading timing, etc.

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

For focus control circuit No. 17, ON1 of the loop
The 0FF signal and a loop abnormality detection signal are exchanged as necessary.

For 18 tracking control circuits, the loop is ON.
10 F F and a track jump command are output, and in particular, when recording digital signals, verification is performed by back jump of the co-track, cueing of the recording position is performed by back jump of 2 tracks, and during playback, continuous reproduction of 2 track back jump is performed. A jump command is output so that recorded digital signals can be smoothly reproduced. In addition, loop abnormality detection signals are exchanged as needed.

For 19 feed control circuits, the loop is 0N1OFF,
Then, a random access command for accessing a desired track is output.

The analog signal demodulation circuit 20 and the digital signal demodulation circuit 27 output address information and the like of the track currently being reproduced. The 27 digital signal demodulation circuits also simultaneously output information called sectors, each of which is divided into about 10 to 30 sections.

22, signals are exchanged according to the current mode, and signals such as communication status with the outside, recording status, playback status, verify status, etc. are exchanged with the second command circuit, as described above. The first and second command circuits control the entire device to operate smoothly.

The second command circuit 22 also outputs an address control signal for the memory 23, a timing control signal for the buffer circuit 24, and the like.

Next, using FIG. 2, the outline of the signal arrangement on the disk recorded by the apparatus described in FIG. 1 will be explained.

Rotation marks such as 1a, lb
, lc, etc. are recorded together with the pregroove forming the track. The pattern is visible due to diffraction. Here, the rotation mark 1a does not have to be previously recorded if it is not required by the device, and the rotation mark 1b.

The number of address signals such as 1C per revolution is not limited to two.

On FIG. 2, AI, A2. A3 . . . The solid lines indicate the state in which analog signals such as video signals and audio signals are recorded, and can be continuously recorded and reproduced along the spiral direction.

Also DOI, DO2... and Dll, D12D
13... Signals indicated by equally broken lines are recorded as digitally modulated signals such as programs and data.

Here, for example, DOl, DO2, etc. are indexes in which management information for the entire disk is recorded, such as the analog signal area and its name on the disk, the digital signal area and its name, and information indicating whether it is a program or data. It is configured to be used as Elijah.

Also Dll, D12. The signals indicated by D13, etc. may be program information for branching according to the order in which the analog signals are reproduced or operating conditions, or may be program information for branching according to the order in which the analog signals are reproduced, or for a computer connected to the outside. It does not matter if it is a program or data. Also, by changing the start position of the analog signal, DOI, DO2,
It is also possible to record digital signals such as programs and data on the inner periphery. With a disk configured in this way, there is no need to predetermine areas for analog signals and digital signals;
. . . Analog signals shown by solid lines and Dll.

D12. This allows the entire disk to be utilized to the fullest until the digital signals indicated by D13... finally overlap.

As described above, according to this embodiment, for example, for a disk with a diameter of 300, 30 minutes of video and 100MB of digital information, 20 minutes of video and IGB of digital information, 10
minutes of video and 2GB of digital information, and a total of 3GB
To provide a recording and reproducing device and a recording and reproducing medium that enable free combinations such as use as a digital information recording medium, and do not require a user to be conscious of the recording classification of analog signals and digital signals. It is something that can be done.

Next, the outline of the signal arrangement on the disk of the second embodiment will be explained using FIG.

Figure 3 shows an example in which a disk is divided into multiple areas to determine areas for analog and digital signals to some extent, and the distribution of analog and digital signals within each area can be freely determined. be.

Similar to FIG. 2, analog signals are shown by solid lines and digital signals are shown by broken lines.

This example shows an example in which the de and r space is divided into two regions, but it is also possible to divide it into more regions in a similar manner.

In each area, the analog signal is All, A12°A1
3...,A21. A22. A23...
Along the spiral direction of the disk, the digital signals are DOI, DO2... Dll, , D12...
...D21. D22, etc. are recorded in the opposite direction to the spiral of the disc.

By dividing the disc into multiple parts in this way, a large recording capacity disc can be used by multiple people, and multiple video signals and their control programs, as well as the main video information within the area, can be digitized to create digital still images. It can be easily saved as a.

Here, along with the management information described in FIG. 2, this division information is also recorded in the innermost periphery DOI, DO2, . . . areas as disc management information.

As described above, by recording analog signals along the disk's spiral and recording digital signals in the opposite direction to the disk's spiral, it is possible to record analog signals without sacrificing continuity, which is an important property of analog signals. This allows the maximum use of the disk without fixing the areas for signals and digital signals. Furthermore, by dividing a large-capacity disk into multiple disks, the relationship between analog and digital signals can be made clearer, allowing multiple people to use the disk, and multiple analog programs to be recorded on a single disk. Then, the control program and digital information obtained by digitizing the main video signal and audio signal can be compared with the analog signal and recorded in each area.
It is extremely easy to combine digital signals. In addition, each multiple area is dedicated to analog signals,
It can also be used exclusively for digital signals,
It enables the recording of analog and digital signals on a single disc while realizing division according to the needs of the user. It is possible to provide an optimal system for recording and reproducing devices and media for moving images and still images using rough graphics.

Note that in Figure 1, 21.22 is 1. Although the second command circuit is used, it is quite possible to combine them into one command circuit or to divide them by function so as to have more command circuits.

Further, it is also possible to substitute the rotation marks, FG, etc. explained in FIG. 1 with signals recorded on the tracks of the disk.

Furthermore, although this example has been described using a recording medium that does not require a magnetic field, a catalyst using a magneto-optical method or the like may also be used.

Further, in this example, a device and a medium capable of recording and reproducing have been described, but it is also fully possible to develop a ROM disk for reproduction only.

Effects of the Invention As described above, the recording/reproducing apparatus of the present invention is equipped with both an analog signal recording circuit and a digital signal recording circuit, and the analog signal is transmitted in the spiral direction of the disc, and the digital signal is transmitted in the opposite direction to the disc spiral. The disc is equipped with a configuration that controls a tracking control circuit, a laser drive circuit, and a signal modulation and demodulation circuit so as to record data in the same direction. By recording each track in the opposite direction to the spiral of the disk, and recording the analog signal in a direction similar to the spiral of the disk without sacrificing the continuity of the signal, the analog signal and digital signal can be separated. This makes it possible to make maximum use of the entire disk area without fixing the capacity.

In addition, by dividing a large-capacity disk into multiple areas and freely using the aforementioned combination of analog and digital signals within each area, it is possible to use multiple areas such as computer graphics and simulation systems on a single disk. It is possible to provide a device and a medium that can extremely easily handle groups of analog information and digital information.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a first embodiment of a signal recording/reproducing apparatus of the present invention, and FIG. 2 is a block diagram of a first embodiment of a signal recording medium of the present invention.
3 is a schematic plan view of the disk in the second embodiment, FIG. 4 is a block diagram of the conventional example, and FIG. 5 is a schematic plan view showing the conventional disk. FIG. 6 is a schematic plan view showing another conventional disk. 1...Disc, 2...Turntable, 3...Disc motor, 4...F
G, 5... Disc motor control circuit, 6...
... Rotating 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, 1. b, Ic...address signal section, Al, A2...analog signal recording track, All, A12...analog signal recording track, A21. A22...Analog signal recording track, Dol DO2...Digital signal recording track, Dll, D12...Digital signal recording track, D21. D22...Digital signal recording track.

Claims (3)

[Claims] (1) A disc with a spiral pre-groove,
A rotating means for rotating the disk, a head means for recording a signal on the disk or reproducing a signal from the disk, an analog signal modulating means for modulating an analog signal such as an audio or video signal, and a digital signal such as data. a digital modulation means for modulating the output of the memory means; a light source control means for controlling a light source such as a laser incorporated in the head means; and a drive control means for driving the head means in the radial direction of the disk. a focus control means for focusing the light source on the recording surface of the disk, and a tracking means for tracking the focused light beam on the pregroove of the disk,
Recording an analog signal using the analog modulation means and light source control means in a direction similar to the spiral of the disk, and in a direction opposite to the spiral of the disk,
A signal recording/reproducing apparatus characterized in that a digital signal is recorded using the digital modulation means and the light source control means. (2) The disc is divided into two or more areas in the radial direction, and an analog signal is recorded from each division point in a direction similar to a spiral, and a digital signal is recorded in a direction opposite to the spiral. A signal recording/reproducing apparatus according to claim (1). (3) A signal recording medium characterized in that an analog signal is recorded in a direction similar to a spiral, and a digital signal is recorded in a direction opposite to the spiral of the disk.