JPH0573921A - Picture recording/reproducing device and recording/ reproducing control method - Google Patents

Abstract

PURPOSE:To record and reproduce a picture signal independent of the kind of picture signal to be recorded and reproduced. CONSTITUTION:A picture signal 1 provided with a picture classification signal indicating the picture signal and the kind of signal is inputted, and the picture classification signal is recorded on a recording medium 10. The device is furnished with a recording means to record the picture signal on the recording medium 10 in accordance with the picture classification signal and a reproducing means to reproduce the picture classification signal recorded on the recording medium 10 also to reproduce the picture signal recorded on the recording medium 10 in accordance with the picture classification signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal recording / reproducing apparatus and a reproduction control method thereof.

[0002]

2. Description of the Related Art As an image signal recording / reproducing apparatus, a VTR or a laser disc player for recording / reproducing an NTSC analog moving image signal has been commercialized for consumer use.
In recent years, in the field of business use, there is a strong demand for digitization and high image quality, and many products intended for them have been commercialized. For example, an apparatus for recording / reproducing an NTSC analog moving image signal by temporally separating it so that a luminance signal and a color signal do not interfere with each other, an apparatus for recording / reproducing an NTSC digital still image signal and a moving image signal, and a high-definition ( Devices for recording and reproducing digital still image signals and moving image signals, etc. have been commercialized.

In addition, magnetic disks and optical disks, which are disk-shaped media, are now drawing attention as media for storing these image signals. In particular, an optical disc is capable of achieving higher recording density than a magnetic disc, and is promising as an image signal storage medium.

[0004]

However, there are three types of optical discs, such as a read-only type, a recording / reproducing type (one time only), and a rewritable type. Therefore, since various storage media exist in addition to various image signals, there are many kinds of products, and since these devices are dedicated, there is a problem that they are almost incompatible with each other.

In view of the above problems of the prior art, it is an object of the present invention to provide an image recording / reproducing apparatus and a recording / reproducing control method capable of recording / reproducing the image signal regardless of the kind of the image signal to be recorded / reproduced. It is what

[0006]

According to the present invention, an image input signal having an image signal and an image type signal indicating the type of the image signal is input, the image type signal is recorded on a recording medium, and the image signal is converted into the image type. Recording means for recording on the recording medium according to the signal, and reproducing the image type signal recorded on the recording medium,
The image recording / reproducing apparatus is provided with a reproducing means for reproducing the image signal recorded on the recording medium according to the image type signal.

[0007]

According to the present invention, when the image signal is recorded, the image type signal included in the image input signal is discriminated, the image type signal is recorded on the recording medium, and the image signal is discriminated according to the discriminated type of the image signal. When the image signal is recorded on the recording medium and the image signal is reproduced, the image type signal recorded on the recording medium is reproduced, the image type signal is discriminated, and recorded on the recording medium according to the discriminated image signal type. The reproduced image signal is reproduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of an image recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is an area-divided image recording / reproducing optical disc, and FIG. 3 is an initial stage at the time of starting the image recording / reproducing optical disc and exchanging the disc. 6 shows a flowchart of a method of motion control.

That is, the image recording / reproducing apparatus receives an image input signal 1 as an input circuit and converts it into a digital signal by an analog-digital converter (hereinafter referred to as A / D).
2) and an input signal discriminator 3 for discriminating the type of the image signal from the image input signal 1 are provided.
As an output circuit, a digital-analog converter (hereinafter D / A) for converting a digital image signal into an analog signal
A converter 13) is provided.

The A / D converter 2 is connected to a data buffer 6 for temporarily storing a digital image signal, and the data buffer 6 is provided for correcting an error occurring in the recording / reproducing process of the image signal. An error correction / correction circuit 4 and a digital modulation / demodulation circuit 5 that modulates an image signal and demodulates the modulated image signal are connected. The digital modulation / demodulation circuit 5 is connected to a recording signal processing circuit 7 for converting the modulated image signal into a recordable image signal, and the recording signal processing circuit 7 controls the laser light output for recording. It is connected to the laser modulation circuit 8. Then, the laser modulation circuit 8 is connected to a semiconductor laser light source provided in an optical system 9 that performs recording and reproduction with laser light.

The input signal discriminator 3 is connected to the A / D converter 2, the error correction / correction circuit 4, the digital modulation / demodulation circuit 5 and the recording signal processing circuit 7 in order to send a processing clock according to the type of the image signal. And a feed control circuit 18 for controlling the feed motor 20 for moving the optical system 9,
And a spindle motor 19 for rotating the optical disk 10.
Is connected to a rotation control circuit 17 for controlling the.
The A / D converter 2, the data buffer 6, the error correction correction circuit 4, the digital modulation / demodulation circuit 5, the input signal discriminator 3,
Recording signal processing circuit 7, laser modulation circuit 8, and optical system 9
Constitutes a recording means.

As shown in FIG. 2, the optical disk 10 rotated by the spindle motor 19 has a data storage area, an image type recording / reproducing area 21 for an image type signal and a data recording / reproducing area 22 for an image signal. It is divided into

In order to reproduce the data recorded on the optical disc 10, the optical system 9 is connected to a preamplifier 11 for amplifying the reproduced signal, which preamplifier 11 is
The reproduction signal processing circuit 12 for removing unnecessary data and the reproduction laser beam spot are the optical disc 10.
It is connected to a focus / tracking control circuit 15 for controlling the optical system 9 so as to trace the upper part with high accuracy. The reproduction signal processing circuit 12 is connected to the digital modulation / demodulation circuit 5 for demodulating the reproduction signal and the image type discriminator 16 for discriminating the type of the image signal from the reproduction signal. The data buffer 6 is connected to a data buffer 6 for temporarily accumulating signals, and the data buffer 6 is connected to a D / A converter 13 for converting the image signal into an analog signal and outputting it as an image output signal.

Since the image type discriminator 16 sends a processing clock corresponding to the type of image signal, the D / A converter 1
3, error correction / correction circuit 4, and digital modulation / demodulation circuit 5
A feed control circuit 18 for controlling a feed motor 20 which is connected to the optical disc 10 and which moves the optical system 9, and an optical disc 10.
It is connected to a rotation control circuit 17 for controlling a spindle motor 19 for rotating the motor. The D / A converter 1
3, the data buffer 6, the error correction / correction circuit 4, the digital modulation / demodulation circuit 5, the image type discriminator 16, the reproduction signal processing circuit 12, the preamplifier 11, the focus / tracking control circuit 15, and the optical system 9 constitute reproduction means. There is.

Next, the operation of the above embodiment will be described.

First, the recording operation of the image recording / reproducing apparatus and the image recording / reproducing optical disk 10 during recording will be described.

The image input signal 1 input from the outside is A
It enters the / D converter 2 and the input signal discriminator 3. The input signal discriminator 3 discriminates the type of image signal from the image type signal in the input image input signal. For example, by the number of signals per unit time of the synchronizing signal of the image signal itself, N
The type of image signal such as TSC signal or HD signal is determined. Based on the determination result, the input signal discriminator 3 controls the A / D converter 2, the error correction / correction circuit 4, the digital modulation / demodulation circuit 5, the recording signal processing circuit 7, the rotation control circuit 17, and the feed control circuit 18. A signal is sent. Based on the control signal, those circuits that have received the control signal change the processing clock of the A / D converter 2, the error correction correction circuit 4, or the like, or the control signal sent from the rotation control circuit 12 to the spindle motor. Changes and the rotation speed of the spindle motor 13 is changed.

The image input signal 1 input to the A / D converter 2 is converted into a digital signal and then input to the data buffer 6. The image data input to the data buffer 6 is input to the error correction / correction circuit 4, and a parity code (parity code is calculated by a predetermined calculation formula in consideration of the error characteristics of the optical disk 10 so that the error can be corrected during reproduction). (Calculated) is added and input again to the data buffer 6. The image data to which the parity code is added is read from the data buffer 6 and input to the digital modulation / demodulation circuit 5. The digital modulation / demodulation circuit 5 is subjected to modulation such as EFM modulation or FM modulation according to the characteristics of the recording / reproducing system of the optical disc 10. The modulated image data is input to the recording signal processing circuit 7, multiplexed with data such as synchronization data and time code, and then input to the laser modulation circuit 8. The laser modulation circuit 8 uses the modulated image data to generate an optical system 9
The semiconductor laser light source provided in the optical modulator is modulated to convert an electrical change into an optical change. The modulated laser light is emitted from the optical system 9 and applied to the optical disc 10.
Due to the thermal effect of the irradiated laser light, etc., the optical disc 1
Recording is performed by causing an optical change in the recording film above 0.
For example, in the case of the optical disc 10 that uses a phase change for recording and reproduction, the reflectance of light at the time of reproduction changes between the portion irradiated with the laser beam having the peak intensity and the portion irradiated with the laser beam having the bottom intensity. .. In this way, a recording bit is formed by the intensity-modulated light applied to the track on the optical disc 10, and while the image input signal is input,
It will be recorded.

When the recording of the image input signal is completed, the input signal discriminator 3 causes the rotation control circuit 17 and the feed control circuit 18 to operate.
, Output a control signal for recording the image type signal,
The spindle motor 19 and the feed motor 20 are controlled at a predetermined speed preset for recording the image type signal. Then, the optical system 9 is moved to a part of the image type recording / reproducing area 21 of the optical disc 10, and the image type signal is recorded in the image type recording / reproducing area 21 of the optical disc 10 from the recording signal processing circuit 7 through the laser modulation circuit 8.

Next, the reproducing operation of the image recording / reproducing apparatus and the image recording / reproducing optical disk 10 during reproduction will be described.

When reproducing the image signal of the optical disc 10 in which the image signal and the image type signal are recorded by the above method,
In order to reproduce and identify the type of the image signal recorded on the optical disk 10 attached to the spindle motor by a preset control signal according to the flow chart as shown in FIG. Thus, the optical system 9 is moved to the image type recording area 21, that is, the inner peripheral portion of the optical disc 10 (step S1). Next is the optical disc 1
The rotation speed of 0 is controlled at a predetermined rotation speed regardless of the type of the image signal (step S2), and the feed speed of the optical system 9 is controlled (step S3). And the optical disc 1
The image type signal recorded in the image type recording area 21 on 0 is reproduced, and the reproduced signal is the optical system 9, the preamplifier 11,
After passing through the reproduction signal processing circuit 12, the image type discriminator 16 is entered and the type of the image signal is discriminated (step S4). According to the type of the image signal of the determination result, the optical disc 10
Is controlled (step S5), and the feed rate of the optical system 9 is controlled (step S6). The image type discriminator 16 also supplies control signals such as a clock signal to the digital modulation / demodulation circuit 5, the error correction / correction circuit 4, and the D / A converter 13 according to the type of the image signal so that the image signal can be reproduced. Output. In this way, the rotation of the optical disc 10 and the feeding speed of the optical system 9 are controlled so as to match the image signal, and the optical system 9 causes the data recording / reproducing area 2 of the optical disc 10 to operate.
The reproduction of the image signal recorded in 2 is started.

The bits of the image signal recorded on the optical disk 10 are emitted from the optical system 9 as continuous light of a constant output without intensity modulation. The reflected light from the optical disc 10 is modulated by the recording bit optical change, enters the optical system 9 again, is detected by the photodetector provided in the optical system 9, and is converted into an electrical reproduction signal. The converted reproduction signal is amplified by the preamplifier 11, and the amplified reproduction signal is synchronized with the reproduction signal processing circuit 12 while unnecessary data is deleted or time code data is read. The synchronized image data is sent to the digital modulation / demodulation circuit 5, and, for example, EFM demodulation or FM demodulation is performed according to the modulation method used for recording, and the demodulated image data is written in the data buffer 6. The demodulated data written in the data buffer 6 is
The error correction / correction circuit 4 corrects or corrects an error generated during the recording / reproducing process. The corrected or corrected image data is sent from the data buffer 6 to the D / A converter 13, converted into an analog signal, and output as an image output signal 14 to the outside of the image recording / reproducing apparatus.

The output signal from the preamplifier 11 is
It is also sent to the focus / tracking control circuit 15 together with the reproduction signal processing circuit 12. In the focus / tracking control circuit 15, the spot of the laser light emitted from the optical system 9 is accurately focused on the optical disc 10 and the spiral or concentric preformatted recording / reproducing track is accurately traced. First, the received signal is subjected to processing such as calculation or amplification. Then, the processed result is sent to the optical system 9 as a control signal, and the laser light spot is accurately focused and tracked through the internal operation mechanism of the optical system 9.

In the above embodiment, the number of signals per unit time of the synchronizing signal is used as the image type signal for discriminating the type of the image signal, but the present invention is not limited to this. If so, another signal may be used. Furthermore, for example, an image type signal that allows the type of the image signal to be discriminated may be separately added to the beginning of the image signal.

In the above embodiment, the reproduction of the image type signal and the reproduction of the image signal are combined by one reproducing means, but the first reproducing means for reproducing the image type signal and the second reproducing means for reproducing the image signal. And may be provided separately.

[0027]

As is apparent from the above description, the present invention has an advantage that the image signal can be optimally recorded and reproduced regardless of the kind of the image signal to be recorded and reproduced.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an image recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an area-divided image recording / reproducing optical disk used in the image recording / reproducing apparatus of the embodiment.

FIG. 3 is a flowchart showing a method of initial operation of control of the image recording / reproducing apparatus of the embodiment.

[Explanation of symbols]

 1 Input Image Signal 2 A / D Converter 3 Input Signal Discriminator 4 Error Correction / Correction Circuit 5 Digital Modulation / Demodulation Circuit 6 Data Buffer 7 Recording Signal Processing Circuit 8 Laser Modulation Circuit 9 Optical System 10 Optical Disk 11 Preamplifier 12 Playback Signal Processing Circuit 13 D / A converter 14 Image output signal 15 Focus / tracking control circuit 16 Image type discriminator 17 Rotation control circuit 18 Feed control circuit 19 Spindle motor 20 Feed motor 21 Image type recording area 22 Data recording area

Claims (5)

[Claims] 1. An image input signal including an image signal and an image type signal indicating the type of the image signal is input, the image type signal is recorded in a recording medium, and the image signal is generated according to the image type signal. A recording unit for recording on the recording medium; and a reproducing unit for reproducing the image type signal recorded on the recording medium and reproducing the image signal recorded on the recording medium according to the image type signal. An image recording / reproducing apparatus characterized by the above. 2. The image type signal is also used as a synchronizing signal of the image signal, the image signal is recorded on the recording medium, and the synchronizing signal is recorded, whereby the image type signal is also recorded. The image recording / reproducing apparatus according to claim 1, wherein 3. The recording means has input signal discriminating means for discriminating the type of the image signal based on the image type signal, and recording the image type signal of the image input signal in a predetermined type area of a recording medium, The image signal of the image input signal is recorded in a predetermined image area of the recording medium according to the determination result by the input signal determination means, and the reproduction means is a first reproduction means for reproducing the signal of the predetermined type area. An image type discriminating means for discriminating an image type from the reproduced signal, and a second reproducing means for reproducing the image signal of the image area according to the result of the image type discriminating means. The image recording / reproducing apparatus according to claim 1. 4. The image recording / reproducing apparatus according to claim 3, wherein the recording means, the first reproducing means, and the second reproducing means are combined by the recording / reproducing means. 5. When recording, an image input signal having an image signal and an image type signal indicating the type of the image signal is input, the type of the image signal is discriminated from the image type signal, and the image type signal is recorded. When recording and reproducing the image signal according to the type of the image signal, the image type signal is reproduced, the type of the image signal is determined from the image type signal, and the type of the determined image signal is determined. A recording / reproducing control method characterized by reproducing an image signal.