JPH0514862A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To offer a disk reproducing device which can clearly recognize the contents of video information and which can quickly retrieve desirable video information by applying it to a CD-I player, etc., reproducing a CD-I disk recording video information, etc., and audio information, e.g. CONSTITUTION:A next screen is displayed only when a present displaying screen and the screen to be displayed are different by more than prescribed percentage (%) such as 50%, etc. Even when the disk is rotated at high speed such as at the speed of 2-3 times the ordinary speed, etc., video information recorded on the disk can be clearly recognized and it can be retrieved at high speed by the high-speed rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus suitable for application to, for example, a CD-I player for reproducing a CD-I disc in which image information and the like are recorded in addition to audio information.

[0002]

2. Description of the Related Art In addition to audio data, image data (natural images, animation,
CD that records computer graphics, etc.), text data, program data, etc. and can be operated interactively
-I (CD Interactive) system is proposed. Since such a CD-I system has a reproducing function for characters, images, sounds, computers, etc., AV consumer equipment mainly for audiovisual, electronic publishing mainly for characters, and a database mainly for information files It can be used for education and entertainment centered on services and dialogue responses, and is expected as a new type of media.

In the CD-I system, various uses are prescribed in order to maintain compatibility and to be widely spread for home use. That is, in the CD-I system,
68000 series CPU (1 developed by Motorola
A 6-bit microprocessor) is used, and a real-time operating system that handles various files is based on the widely spread OS 9. Two trigger buttons and an XY device are used as the input device, and the output system is
Two systems, audio and video, are available.

Further, the CD-I player is defined so that it can reproduce a normal compact disc for music. In such a structure of the CD-I player, a player main body on which a disc is mounted and played back, the player main body is covered, and the above-mentioned two trigger buttons and an XY device are arranged on the outer surface thereof. An inner lid that functions as a control panel and an outer lid that protects the inner lid that functions as the control panel and has a display unit such as an LCD display provided on the inner surface thereof. Further, the CD-I player is driven by using a dry battery or a commercial power source.

[0005]

When reproducing image information in such a conventional CD-I player, it is sometimes desired to retrieve desired image information. In this case, when all the images are viewed, it may take some time to search for desired image information. In this case, it is conceivable that the image information recorded on this disc may be reproduced by sampling and viewed, but in this case, if the sampling density is rough, there is the inconvenience of not knowing what is recorded on this disc. .. The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to clearly understand the contents of image information and quickly search for desired image information.

[0006]

DISCLOSURE OF THE INVENTION The disc reproducing apparatus according to the present invention, for example, when the current display screen and the screen to be displayed next differ by a predetermined percentage (%) or more as shown in FIGS. The screen is displayed.

[0007]

According to the present invention, since the next screen is displayed only when the current display screen and the screen to be displayed next differ by a predetermined percentage (%), for example, 50% or more, the disk is rotated at a high speed, for example, during retrieval. Even when it is rotated at a speed of 2 to 3 times, the image information recorded on the disc is clearly understood and the high-speed rotation enables high-speed retrieval.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the disc reproducing apparatus of the present invention will be described below with reference to the drawings. In FIG. 2, 1
Reference numeral 5 denotes a disk, and this disk 15 is rotated by a spindle motor 21 at CLV (constant linear velocity). The rotation of the spindle motor 21 is controlled by the spindle servo circuit 22 based on the clock reproduced by the CD reproducing circuit 28. Further, the output of the system controller 20 is supplied to the spindle servo circuit 22.

The recording signal of the disk 15 is the optical head 23.
Will be played. The optical head 23 is supported by a biaxial device. The output of the focus / tracking servo circuit 25 is supplied to the biaxial device. The output of the system controller 20 is supplied to the focus / tracking servo circuit 25. In the focus / tracking servo circuit 25, servo is applied to the optical head 23 in two axes in the focus direction and the tracking direction based on the output of the photodetector.

Further, the optical head 23 can be moved in the radial direction of the disk 15 by a slide feed mechanism 24 using, for example, a linear motor. The slide feeding mechanism 24 is controlled by a sled servo circuit 26.
The sled servo circuit 26 includes the system controller 2
An output of 0 is provided. The slide feeding mechanism 24 allows the optical head 23 to access a desired track position.

The output of the optical head 23 is supplied to a CD reproducing circuit 28 via an RF amplifier 27. The CD reproduction circuit 28 includes a bit clock reproduction circuit, an EFM demodulation circuit,
It is composed of a CIRC error correction circuit and the like. In the CD reproducing circuit 28, the output of the optical head 23 is EFM demodulated and subjected to error correction processing. The CD reproducing circuit 28 is controlled by the system controller 20.

The output of the CD reproducing circuit 28 is supplied to the CD-ROM reproducing circuit 29. CD-ROM reproduction circuit 29
Is composed of a sync detection circuit, a descramble circuit, an error correction circuit, and the like. The CD reproducing circuit 28 detects the sync and descrambles it. Then, the header address is checked and the target block is accessed. Then, in the case of form 1, error correction processing is further performed. The CD-ROM reproducing circuit 29 is controlled by the system controller 20. Also CD-
The output of the ROM reproducing circuit 29 is supplied to the signal processing circuit 44 and the pattern recognition circuit 45 which operate according to a command from the system controller 20 during high speed retrieval. The signal processing circuit 44 and the pattern recognition circuit 45 are for determining whether or not the display patterns of the screen currently displayed on the display 13 and the reproduced image information to be displayed are different by, for example, 50% or more. is there.

Input of a desired command is given to the system controller 20 from the input device 30. Input device 30
Consists of two trigger buttons 10A, 10B and an XY device 11. Reference numeral 31 is a CPU for controlling the CD-I system. 68,000 as the CPU 31
The thing of the system is used. A master controller 32 is connected to the CPU 31. The CPU 31 and the system controller 20 are bidirectionally connected. C
A bus 33 is derived from the PU 31. CPU3
One in which 1 and the master controller 32 are integrated into one chip may be used.

The data reproduced by the CD-ROM reproducing circuit 29 is sent to the bus 33 via the signal processing circuit 44 and the pattern recognition circuit 45. RAMs 35A and 35B are connected to the bus 33 via video controllers 34A and 34B, respectively. A system ROM 36 and a backup non-volatile RAM 37 are bidirectionally connected to the bus 33. An audio decoder 38 is connected to the bus 33.

Image data of the data reproduced by the CD-ROM reproducing circuit 29 is controlled by the CPU 31.
It is supplied to the video controllers 34A and 34B. The video controller 34A and 34B form a video signal based on the image data. This video signal is supplied to the video synthesizer 39. The video synthesizer 39 synthesizes the video signal from the video controller 34A and the video signal from the video controller 34B. The output of this video synthesizer 39 is L
It is supplied to the LCD display 13 via the CD drive circuit 40. The LCD display 13 is driven by the LCD
It can be turned on / off by the drive switch 14.

The audio data of the data reproduced by the CD-ROM reproducing circuit 29 is supplied to the audio decoder 38 under the control of the CPU 31. When the audio data is ADPCM, the audio decoder 38 decodes the ADPCM. The decoded audio data is supplied to the D / A converter 41 and converted into an analog signal. Then, it is output from the headphone output terminal 3 via the low-pass filter 42 and the amplifier 43. The audio signal level output from the headphone output terminal 3 can be set by the volume adjusting dial 4.

FIG. 3 shows the appearance of a CD-I player according to this example. The CD-I player of this example has an LCD display 13 integrated therein so that it can be easily carried outside. The miniaturization and weight reduction have been achieved by making integrated circuits and using chip parts. This CD-I
The overall size of the player is, for example, 140 mm in width, 170 mm in length, and 60 mm in height.

In the housing of the player main body 2 of the CD-I player, there are a disk drive section for rotating and driving the mounted disk 15, a head drive section for moving the optical head in the radial direction of the disk, and an optical head. A circuit board for signal processing of the reproduced signal is stored. Furthermore, 6800
It contains a computer consisting of a 0-system CPU.

On the front side surface 2A of the player main body 2, a headphone output terminal 3, a volume adjusting dial 4, a power source on / off.
An off switch 5 is provided. In addition, the player body 2
An open button 6 is provided at the front upper edge of the.

An inner lid 7 is rotatably arranged on the player body 2 of the CD-I player. Open button 6
When is pressed, the inner lid 7 is opened as shown in FIG. 3B. When the inner lid 7 is opened, the disc 15 can be loaded / unloaded. A window portion 8 is provided in the inner lid 7. A transparent member is provided in the window portion 8. The rotating state of the mounted disk 15 can be confirmed through the window 8.

A trigger button 10A, a trigger button 10B, and an XY device 11 are arranged on the front edge of the inner lid 7. The XY device 11 is designed so that the positions in the X direction and the Y direction can be designated by pressing the portions deviated from the center thereof in the vertical and horizontal directions.

A pointing device such as a trackball, a mouse or a joystick can be used as the XY device 11. Inner lid 7
Further, the outer lid 12 is rotatably disposed on the above. This outer lid 12 can be opened by hand. This outer lid 12
Can be opened up to an opening / closing angle of 90 degrees or more and can be fixed at a predetermined opening / closing angle θ. This outer lid 1
On the rear surface 12A of the second LCD, for example, a 4-inch LCD
A display 13 is provided. When the outer lid 12 is opened, the LCD display 13 is exposed and the LC
The screen of the D display 13 becomes visible. Further, on the back surface 12A of the outer lid 12, the LCD drive switch 1
4 are provided. By operating the LCD drive switch 14, ON / OFF of the LCD display 13 can be controlled.

In this CD-I player, the disc 15
To play CD-I discs, CD-I / CD-DA discs (discs in which CD-I discs and CD-DA discs are mixed), and CD-DA discs (compact discs for normal music playback). You can Here, the CD-I data format will be described.

The CD-I records data in a form based on a CD-ROM. The recording unit of data is a block, like a CD-ROM. One block corresponds to 98 frames. The capacity of one block is 6 (the number of audio data) × 2 (stereo 2 channels) × 2 (byte unit conversion) × 98 (the number of frames) = 2
It is 352 bytes. The recording capacity of the entire CD-I disc is 12
For a cm disc, this would be about 640 Mbytes.

There are two types of data structure of CD-I, form 1 and form 2. This corresponds to the mode 1 and the mode 2 of the CD-ROM, respectively. In addition, CD-R
Mode 1 in the OM is a mode in which an error detection code and an error correction code are added to one block of data so that strong error correction can be performed. Also, CD-
Mode 2 in the ROM is designed to allow large user data without adding an error detection code and an error correction code.

In the CD-I, the form 1 and the form 2 can be designated for each block, and the form 1 and the form 2 can be mixed in one disc. C
The D-I format differs from the CD-ROM format in that a sub-header of 8 bytes is provided at the beginning of the user data. This subheader has an acoustic
Each block in which image data is recorded is time-division multiplexed in block units. Then, in order to process these in real time, necessary data is double-written and stored. This subheader consists of four items: file number, channel number, submode, and data type.

That is, FIG. 4A shows the structure of Form 1. Form 1 has a sync at the beginning (12 bytes)
Is provided, followed by a header (4 bytes), and further a subheader (8 bytes). After this, user data (2048 bytes) is provided,
Error detection code EDC (4 bytes), error correction P parity (172 bytes), Q parity (10 bytes)
4 bytes) is added. Form 1 has improved error correction capability, and this form 1 is suitable for handling data such as character data and program data in which an error cannot be interpolated.

FIG. 4B shows the structure of Form 2. In the form 2, a sync (12 bytes) is provided at the beginning, a header (4 bytes) is provided following this, and a subheader (8 bytes) is further provided. After this, user data (2324 bytes) and a reserve area (4 bytes) are provided. This form 2 is suitable for handling interpolable data such as audio data and video data. As shown in Fig. 5, the subheader added to the beginning of the user data is a file number (2 bytes) and a channel number (2 bytes).
And a sub mode (2 bytes) and a data type (2 bytes).

The operation of this embodiment will be described below with reference to FIGS. 6, 1 and 7. FIG. 6 shows the operation when the LCD display 13 is turned on. In FIG. It is determined whether the on / off switch 5 and the internal clock are set (step 51).

When the calendar and the internal clock are set, the calendar and the internal clock are set using the XY device 11 and the trigger buttons 10A and 10B (step 52). Then, when the calendar and the internal clock are set, it is judged whether or not the disc is mounted (step 53).

When the calendar and the internal clock are not set in step 51, the process proceeds to step 53, and it is judged whether or not the disc is mounted. If the disc is not loaded, the LCD display 13 displays the disc when it is not loaded (step 54). That is, when the disc is not mounted, the display indicating that the disc is not mounted is displayed in the display area of the LCD display 13, and the calendar and the time are displayed in the display area.

Then, the judgment as to whether or not the disc is mounted is continued (step 55). When it is detected in step 53 or step 55 that the disc is loaded, the TOC at the innermost circumference of the disc is accessed (step 56).

Then, from the TOC data, first, the CD
-I / CD-DA disc or CD-I disc or C
It is determined whether the disc is a D-DA disc (step 57). That is, in the CD-I disc or the CD-I / CD-DA disc, the PSEC at the time of (POINT = A0) is "1".
0 ", and for other discs, (POINT = A0)
At that time, PSEC is set to "00", so (POI
From PSEC when NT = A0), it is determined whether the disc is a CD-disc, a CD-I / CD-DA disc, or a CD-DA disc.

When it is determined that the disc is a CD-DA disc, the display when the CD-DA disc is mounted is displayed on the LCD display 13 (step 5).
8). That is, when a CD-DA disc is loaded, a display indicating that the disc is loaded is displayed in the display area of the LCD display 13, and operation keys such as PLAY, AMS, and STOP for operating the CD-DA are displayed in the display area. Is done.

The operation keys displayed in the display area are the XY device 11 and the trigger buttons 10A and 10A.
When operated using B, the CD-DA disc is reproduced according to this operation (step 59). Step 5
When it is judged that it is not a CD-DA disc in 7,
It is determined whether the CD-I disc is a CD-I / CD-DA disc (step 60). That is, the control field of (POINT = A0, A1, A2) of the CD-I disc is (01 × 0), and the CD-I / CD-D
Since the (POINT = A0) control field of the A disc is always (01 × 0) and the other control fields are (00 × 0), the control field indicates CD-I disc or CD-I / CD. −
It is determined whether it is a DA disk.

When it is determined that the loaded disc is a CD-I disc, the LCD display 13 displays the CD-I disc loaded (step 61). That is, when the CD-I disc is loaded, a display indicating that the disc is loaded is displayed in the display area of the LCD display 13, and the title of application software or the like is displayed in the display area.

Then, in accordance with the instruction of the application software, the XY device 11 and the trigger button 1
When the operation is performed using 0A and 10B, the reproduction of the CD-I disc is performed according to this operation (step 62).
When it is determined that the loaded disc is a CD-I / CD-DA disc, the LCD display 1 indicates when the CD-I / CD-DA disc is loaded.
3 (step 64). That is, CD-I /
When a CD-DA disc is loaded, a display indicating that the disc is loaded is displayed in the display area of the LCD display 13, and a PLA for operating the CD-DA is displayed in the display area.
Operation keys such as Y, AMS, and STOP are displayed, and the title of application software is displayed in the display area.

Then, in the case of the CD-I / CD-DA disc, it is judged whether or not only the CD-DA is reproduced (step 65). The operation keys displayed in the display area are the XY device 11 and the trigger buttons 10A and 1
When operating with 0B, CD-DA
Reproduction of only the area portion is performed (step 66).
When the XY device 11 and the trigger buttons 10A and 10B are operated according to the instruction of the application software, the CD-I / CD-DA is responded to by this operation.
Is reproduced (step 67).

Thus, in this example, the CD-I / CD
In the case of a DA disc, only the CD-DA area can be reproduced. This allows you to enjoy only the sound of the application software.

Further, in the present embodiment, when reproducing desired image information when reproducing the image information, the CD-I is used.
The player is brought into a search state by the input device 30. At this time, the disk 15 is rotated at a rotational speed of 2 during normal reproduction, for example.
Plays back at 3 times the rotation speed, and the signal processing circuit 4
4. The pattern recognition circuit 45 is put into an operating state and operates according to the flowchart shown in FIG. First, the image data at the time of reproduction is stored in a predetermined memory such as the RAM 35A, and the image data stored in the memory 35A is displayed on the display 13. It is assumed that the screen currently displayed on the display 13 is, for example, the screen shown in FIG. 7A in which a bird is flying. The image data in the memory 35A and the next reproduced image data are continuously compared by the signal processing circuit 44 and the pattern recognition circuit 45, and the reproduced image data is 50% or more of the image data of the current display screen and the display pattern. For example, when a still image of another bird becomes 100% (all) as shown in FIG. 7B, this image data is displayed on the display 13 and stored in the memory 35A. The search is stopped when the desired image data is found by sequentially repeating the above.

In this example, as described above, when the current display screen of the display 13 and the screen to be displayed next are different by 50% or more, for example 100% (all), the next screen is displayed, so the disk 15 is rotated at high speed. For example, the image data displayed on the display 13 like a picture-story show (still image) and recorded on the disk 15 can be clearly understood even when the display 13 rotates at a speed 2 to 3 times faster than the normal speed, and the display 13 rotates at a high speed. This has the advantage that high-speed search is possible.

The present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0043]

According to the present invention, there is an advantage that image information can be retrieved quickly and clearly.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of a disc reproducing apparatus of the present invention.

FIG. 2 is a block diagram showing an embodiment of a disc reproducing apparatus of the present invention.

FIG. 3 is an external view showing an example of a disc reproducing apparatus of the present invention.

FIG. 4 is a diagram used to explain CD-I.

FIG. 5 is a diagram used to explain CD-I.

FIG. 6 is a flowchart for explaining a CD-I player.

FIG. 7 is a diagram for explaining the present invention.

[Explanation of symbols]

 13 LCD Display 15 Disk 20 System Controller 30 Input Device 31 CPU 35A, 35B RAM 44 Signal Processing Circuit 45 Pattern Recognition Circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location G11B 27/00 E 8224-5D H04N 5/85 B 7916-5C

Claims (1)

Claims: What is claimed is: 1. A disk characterized in that the next screen is displayed when the current display screen and the screen to be displayed next differ by a predetermined percentage (%) or more. Playback device.