JPH09294248A - Optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the memory configuration and the processing procedure in the case of conducting signal processing for closed caption data in the user data mode and the MPEG mode. SOLUTION: A DRAM 8 has a pixel data buffer to store valid image data of closed caption data in the user data mode and a dynamic image buffer (V-RAM) or the like to store the moving image data and the closed caption data in the MPEG mode. The closed caption data of the user data expanded in the pixel data buffer and the closed caption data in the MPEG mode expanded in the moving image buffer are outputted to a receiver with a teletext decoder for a 21H period of a television signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video CD so that a television receiver with a character decoder can display it.
An optical disc that reproduces user data in a picture layer recorded on an optical disc such as a DVD (digital video disc: digital versatile disc) or MPEG mode closed caption data (character information) and outputs the reproduced data to a television receiver. Reproduction device

[0002]

2. Description of the Related Art Generally, there is known a technique in which closed caption data is added to a portion of a video signal which is not displayed, and the image is superimposed on the screen of a television receiver with a character decoder. In this case, of all the scanning lines 1H to 525H of the television signal, 1H to 21
H (264H to 284H) is used as the vertical blanking period, and 22H to 263H (285H to 52).
5H) is used as a video signal, the broadcasting station has one of the vertical blanking periods (for example, 21H).
Is used to transmit a character code as an NRZ signal, the character decoder on the receiver side converts the NRZ signal into a character image, and the character image is displayed on the screen of the receiver while being superimposed on the video image.

Therefore, even in a video CD or a DVD, "character information" is recorded in the user data area or the MPEG data area, reproduced, and converted into an NRZ signal so that the character decoder on the receiver side can decode it. It is conceivable to superimpose it on 21H of the television signal and output it to the receiver.

[0004]

When the closed caption data is recorded in the user data area of the optical disk and reproduced, converted into the NRZ signal and superimposed on the 21H of the television signal, 1 A method of combining with image data on a single image memory can be considered. However, in this case, complicated processing of the data stream of the optical disc composed of I, P, B pictures and the like and signal processing such as NRZ conversion of closed caption data of user data must be performed at the same time. As a result, there is a problem that the processing procedure becomes complicated.

Further, in order to record the closed caption data in the MPEG data area of the optical disc and reproduce it, 22H to 263H (285H to 525)
If an area for closed caption data for 21H is additionally provided to the image data memory for H), there is a problem that the memory configuration becomes complicated. Further, as image processing, a method is known in which vertical interpolation is performed based on the correlation between every two adjacent lines.
When the data of the MPEG mode is assigned to the minute line, there is a problem that the closed caption data is disturbed because the lower line interferes with this line.

In view of the above problems, the present invention provides an optical disk reproducing apparatus capable of simplifying signal processing when recording and reproducing closed caption data in a user data area of an optical disk. To aim. It is another object of the present invention to provide an optical disc reproducing apparatus capable of simplifying a memory configuration and a processing procedure when recording and reproducing closed caption data in an MPEG data area of an optical disc. It is another object of the present invention to provide an optical disc reproducing apparatus capable of preventing the closed caption data from being disturbed when performing signal processing of the MPEG mode closed caption data.

[0007]

In order to achieve the above-mentioned object, the present invention provides an NR for closed caption data.
NRZ of closed caption data by expanding Z data and image data in different areas of memory by separate processing.
The data is read in the section of 21H of the television signal and is output to the overlayer, and is read from the section of the television signal after 22H and is output to the base layer to be combined on the bus. The present invention also stores the MPEG mode closed caption data reproduced from the optical disc in the first line of the memory and the image data in the second line and thereafter,
The closed caption data in the PEG mode is read and output in the section of 21H of the television signal, and the image data is read from the section of 22H and after of the television signal. The present invention also provides the first
The vertical interpolation is not performed on the data read from the storage means in the section 21H of the television signal, but the vertical interpolation is performed on the image data read from the section 22H and thereafter.

That is, according to the present invention, a reproducing means for reproducing the image data recorded on the optical disc and the closed caption data of the user data, and a first means for storing the image data reproduced by the reproducing means. Storage means, image data processing means for expanding the image data reproduced by the reproducing means and storing it in the first storage means, and NRZ data of closed caption data of user data reproduced by the reproducing means. And a closed caption data processing means for converting the closed caption data of the user data reproduced by the reproducing means into NRZ data and storing the NRZ data in the second storage means. When,
The NRZ data stored in the second storage means is read in the section 21H of the television signal and output to the overlayer, and the image data stored in the first storage means is stored in the section of the television signal 22H and thereafter. There is provided an optical disc reproducing apparatus having a synthesizing unit for synthesizing on the bus by reading the data from the optical disc and outputting it to the base layer. According to the present invention, the reproducing means for reproducing the compressed image data recorded on the optical disc and the closed caption data in the MPEG mode, the image data and the MP.
Storing means for storing the closed caption data in the EG mode and the closed caption data in the MPEG mode reproduced by the reproducing means are stored in the first line of the storing means to expand the compressed image data. Image data processing means to be stored in the storage means on and after the second line, and MPEG stored in the storage means.
There is provided an optical disc reproducing apparatus having a synthesizing unit for synthesizing closed caption data of a mode by reading and outputting the closed caption data in a section of 21H of a television signal, and reading image data from a section of the television signal after 22H. It Also, vertical interpolation is not performed on the MPEG mode data read from the storage means in the 21H section of the television signal, but vertical interpolation is performed on the image data read from the 22H section and thereafter. It is characterized by further comprising an interpolating means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing an embodiment of an optical disc reproducing apparatus according to the present invention, and FIG. 2 is a block diagram of FIG.
A block diagram showing the PEG / Photo CD decoder in detail,
Figure 3 shows the closed caption (CC) of a video CD.
An explanatory diagram showing the format of user data, FIG. 4 is an explanatory diagram showing the data length of the main fields of FIG. 3, FIG. 5 is a flowchart for explaining the picture layer processing routine, and FIG. 6 is the user data routine of FIG. 7 is a flowchart for explaining the "save user data" process of FIG. 6 in detail, and FIG. 8 is a flowchart for describing the "discard user data" process of FIG. 6 in detail. 9, FIG. 9 is a flow chart for explaining the “read slice start code” process of FIG. 6 in detail, FIG. 10 is a flow chart for explaining the “search for slice start code” process of FIG. 6 in detail, and FIG. 11 is FIG. 11 is a flow chart for explaining in detail the caption routine of FIG.
13 is a flowchart for explaining in detail the NRZ conversion processing of FIG. 13, FIG. 13 is a flowchart for explaining in detail the VSYNC interrupt routine, FIG. 14 is a flowchart for explaining in detail the HSYNC interrupt routine, and FIG. 15 is for closed caption (CC). It is explanatory drawing which shows output timing.

The optical disk reproducing apparatus shown in FIG. 1 is, for example, a dual-purpose machine capable of reproducing a music-only CD. The information recorded on the disc D of the video CD or DVD or the music-only CD is read by the pickup 1, the signal is amplified by the RF amplifier 2, and then applied to the CD-decoder / servo control circuit 3. The CD-decoder / servo control circuit 3 causes the SP (spindle) / servo control circuit 11 to perform rotation control of the disk motor, focus control of the pickup 1, and the like, demodulates the EFM signal from the RF amplifier 2, Read subcode data.

The second CPU 4 uses the TOC (Ta
It has a memory for temporarily storing the data read from the ble of contents area in a predetermined table format, and takes in the subcode data to control the CD-decoder / servo according to the input information from the input instruction section 5. The circuit 3 is controlled. The input instruction section 5 is, for example, a PLAY button, a STOP button, an FF button, an R button.
F button, DIGEST button, JU
It has an MP (jump) button and the like, and the display unit 20 displays an operation mode, a device abnormality, and the like. The audio signal processing circuit 15 converts the reproduced digital audio signal into an analog signal and performs de-emphasis processing.
The above circuit is a circuit for reproducing a CD dedicated to music.

The circuit system shown within the one-dot chain line is a video CD additionally provided to the signal system of the music-only CD.
Alternatively, it is a signal system for DVD, and the first CPU 6, RO
M7, DRAM8, MPEG / Photo CD decoder 9,
Video signal processing circuit (SSG) 10, NTSC / PAL
It has an encoder 23 and crystal oscillators 21, 24, 25. The first CPU 6 controls the second CPU 4 and the MPEG / photo CD decoder 9 to control the entire apparatus.

The MPEG / photo CD decoder 9 is an RO in which a program for controlling the entire apparatus is stored in advance.
M7 and a video CD or D input from the CD-decoder / servo control circuit 3 via the 4-bit data bus b1.
A DRAM 8 for storing a compressed signal for VD is provided,
The compressed signal is restored to the image data necessary for displaying one normal screen, and the audio signal is expanded.

An 8-bit data bus b2 is provided between the MPEG / photo CD decoder 9 and the first CPU 6 for transmitting mode information and for obtaining status which is the processing status of the program in the decoder 9. , A 7-bit data bus b3 for transmitting / receiving data address information and transmitting a control signal for controlling the decoder 9, and a 1-bit data bus b4 for obtaining input information of a data string to be input to the decoder 9, It is connected via a 3-bit data bus b5 for audio status.

The video signal processing circuit 10 converts the digital audio signal demodulated by the decoder 9 into an analog signal, or converts the RGB signal, the luminance signal and the color difference signal into a composite signal, and then the NTSC / PAL encoder 2
3, and the NTSC / PAL encoder 23 converts this composite signal into an NTSC system or PAL system signal and outputs it to a receiver with a character decoder (not shown). The crystal oscillator 21 generates a master clock for operating the decoder 9, and the crystal oscillator 24 is a video signal processing circuit 1.
A clock of 13.5 MHz or 27 MHz suitable for 0 processing is generated, and the crystal oscillator 25 is 3.57945 MHz (NTSC) which is a color subcarrier for the encoder 23.
Or it generates 4.43361875 MHz (PAL).

Next, referring to FIG. 2, MPEG / Photo C
The D decoder 9 will be described in detail. The decoder 9 is generally a RISC processor 31, a variable length code decoder (VLD) (not shown), and three interfaces 33-3.
5, the RISC processor 31 not only controls the VLD and the interfaces 33 to 35, but also the MPEG1.
It performs syntax decoding, two-dimensional IDCT, inverse quantization, motion vector calculation, and the like.

As the interfaces 33 to 35, the host bus interface 33 inputs the compressed data stream and sets the internal registers, and the video display processor 34 outputs the decoded image and DR.
The AM controller 35 controls the DRAM 8. This D
The RAM 8 is used as a rate buffer, a reference image memory, a display memory, and a RISC instruction memory, and particularly, a pixel data buffer “1” for storing effective image data of closed caption data in user data mode, and a closed memory. ·caption·
It has a pixel data buffer “0” for storing a pull-in signal when data is not valid, a moving image buffer (V-RAM) for storing closed caption data and moving image data in the MPEG mode, and the like.

Here, the pull-in signal of the pixel data buffer "0" is read when the user data active flag described later is off, and the image data of the pixel data buffer "1" has the user data active flag on. Is read. In this case, the image data read from the moving image buffer (V-RAM) is output to the base layer, and the pixel data buffer “0”,
The data read from "1" is output to the overlayer, so that both data are combined on the bus.

The user data mode closed caption data reproduced from the video CD is decoded, converted into an NRZ signal and stored in the pixel data buffer "1" of the DRAM 8. in this case,
One of the pixel data buffers “0” and “1” is empty and the other is valid, and writing and reading are controlled by the FIFO. The interface with the DRAM 8 is 16 bits. Here, the processing amount of MPEG1 is 1/6 or less and the memory bandwidth is 1/4 or less as compared with MPEG2. The actual pixel rate is about 3.3 MHz assuming a SIF (source input format) screen, and most of the decoding process can be performed by sequential processing using RISC operating at 40 MHz.

[0020]

[Table 1] Here, the hierarchical structure of the image data of the video CD is from the highest layer to the lowest layer: sequence layer, group of picture layer, picture layer, slice layer, macroblock layer, block layer However, the present invention particularly relates to the processing of the picture layers and below.

[0021]

[Table 2] Then, after processing the sequence layer and the group of picture layers, when processing the picture layer, the processing is performed in the following order.・ PSC: Picture Start Code
Code) ・ TR: Temporal Referen
ce) ・ PCT: Picture coding type (Picture C
oding Type) ・ VD: Video Buffering Verifier Delay ・ FPFV: Full Pel Forward Vector (Full P)
el Foward Vector) -FCC: Forward F Code-FPBV: Full Pell Backward Vector (Full)
Pel Backward Vector) BFC: Backward F Co
de) ・ EBP: Extra Bit P
icture) ・ EIP: Extra information picture
(Extra InformationPicture) ・ ESC: Extension start code (Exten
sion Start Code) PED: Picture extension data (Pictu
re Extension Data) -UDSC: User data start code (User Da
ta Start Code) -UD: User data-Slice layer

As shown in detail in FIG. 3, the closed caption (CC) user data of the video CD (VII.4) includes two fields of zero bytes and one field of user data start code (UDSC). 4 and the user data group for N fields, the data length of each field is, as shown in FIG. 4, 0 byte is 1 byte, the user data start code is 4 bytes, and the user data group is variable length.

Each of the user data groups has a tag name and a user data group length (U
Length) and CC user data, and the data length of each field is as shown in FIG.
Both the tag name and user data group length are 1 byte,
The CC user data is (user data group length-2) bytes. Further, the CC user data is composed of EIA-608 characters for 2 fields.
The field is composed of 7-bit data bits (ASCII code) and 1-bit parity bit.

Next, the picture layer routine will be described with reference to FIG. First, after performing the necessary processing (not shown) of the picture layer, the data in the closed caption control register is read (step S
1) Then, it is determined whether or not the closed caption is enabled (step S2). If enabled, the process proceeds to step S3. On the other hand, if NO, the user data mode flag, the user data active flag, and the MPEG mode flag are turned off (step S8), and the process proceeds to step S9.

In step S3, it is determined whether the closed caption is in the user data mode. And N
In the case of O (in the MPEG mode), both the user data mode flag and the user data active flag are turned off (step S4), then the MPEG mode flag is turned on (step S5), and the process proceeds to step S9. On the other hand, if the closed caption is the user data mode in step S3, the MPEG mode flag is turned off (step S6), then the user data mode flag is turned on (step S7), and step S9 is performed.
Proceed to.

In step S9, the start code is read,
Then, it is judged whether or not the code is ESC (extension start code) (step S10a), and E
If it is SC, the process returns to step S9, while ESC
If not, the process proceeds to step S10b. Step S1
0b determines whether the code is UDSC (User Data Start Code), and if it is UDSC, it proceeds to the user data routine shown in detail in FIG. 6 to FIG. Proceed to the caption routine detailed in FIG.

In the user data routine shown in FIG. 6,
First, the tag name (1 byte) and the user data group length (1 byte) in the user data group shown in FIGS. 3 and 4 are read in 16-bit length (step S11),
Next, the upper byte of this data (tag name = 0x1
1) is taken out (step S12), and then the lower byte (user data group length) is taken out (step S1).
3), then 2 (bytes) from the user data group length
Is subtracted (step S14).

Then, it is determined whether the closed caption is in the user data mode (step S15). Then, in the case of YES, in steps S16 to S19, when the scan information data (tag name = 0x10), the "discard user data" process shown in detail in FIG. 8 is executed and the process returns to step S11.
In the case of closed caption data (tag name = 0x11), the "save user data" process shown in detail in FIG. 7 is executed, and the process returns to step S11.
If neither, the process proceeds to step S24.

If the closed caption is not in the user data mode in step S15 (MP
In the case of the EG mode), when the scan information data (tag name = 0x10) in steps S20 to S23, the "save user data" process shown in detail in FIG. 7 is executed, and the process returns to step S11. When the caption data (tag name = 0x11), the "discard user data" process shown in detail in FIG. 8 is executed and the process returns to step S11. If neither, the process proceeds to step S24.

In a succeeding step S24, it is determined whether or not the end of the user data (tag name = 0), and in the case of YES, a "read slice start code" process shown in FIG. 9 is executed to execute a caption routine. Go to
On the other hand, in the case of NO, the “slice
Perform the "Find Start Code" process and proceed to the caption routine.

In the "save user data" process shown in detail in FIG. 7, the user data is read in 16-bit length (step S31), and then the user data FI of the DRAM 8 is read.
The data is saved in the FO area (step S32), and then the write pointer of the user data FIFO area is incremented by 1 (step S33). Next, if the value of the write pointer is not correct, it is corrected (steps S34 → S35), then 2 (bytes) are subtracted from the user data group length (step S36), and if the user data group length is “0”, step The process returns from step S37 to step S31. If it is not "0", the process returns from step S37 to step S11 shown in FIG.

In the "Discard user data" processing shown in detail in FIG. 8, the user data is read in 16-bit length (step S41), and then the user data group length is changed to 2
(Byte) is subtracted (step S42), and if the user data group length is not "0", then step S4
3 returns to step S41, and if "0", returns from step S43 to step S11 shown in FIG.

In the "read slice start code" processing shown in detail in FIG. 9, the write pointer of the user data FIFO area is saved (step S51), and the next user data is read in 16-bit length (step S5).
2) Next, if new user data is saved, an interrupt is issued to the host microcomputer (second CPU 4) (steps S53 → S54), and the process proceeds to the caption routine.

In the "search for slice start code" processing shown in detail in FIG. 10, the write pointer of the user data FIFO area is saved (step S61), and then the user data is skipped to the next slice start code (step S62). Next, if new user data is stored, an interrupt is issued to the host microcomputer (second CPU 4) (steps S63 → S64), and the process proceeds to the caption routine.

Next, the caption routine will be described with reference to FIGS. 11 and 12. In FIG.
First, the read pointer of the user data FIFO area is read (step S71), and then the user data FIFO
The write pointer of the area is read (step S72). Next, it is determined whether or not there is caption data that has not been output (step S73), and if not, the user data / active flag is turned off (step S87).
Next, the process proceeds to a slice layer processing routine which is a process of the layer next to the picture layer, and the MPEG compressed image is decoded. If there is caption data that has not been output in step S73, it is determined whether or not the user data mode is set (step S74). If NO, the user data active flag is turned off (step S8).
7) Go to the slice layer processing routine.

If the user data mode is selected in step S74, the data (C
C user data) is read (step S75), the read pointer is advanced by 1 (step S76), and if the read pointer is incorrect, the read pointer is corrected (steps S77 → S78). Next, the updated read pointer is saved (step S79), then the upper byte (character "1") of the CC user data is taken out (step S80), and then the write pointer of the pixel data buffer is set to the beginning of the first byte. (Step S81), and then the NRZ conversion process shown in detail in FIG. 12 is executed (step S82).

When the NRZ conversion processing of the character "1" is completed, the lower byte (character "2") of the CC user data is taken out (step S83), and then the write pointer of the pixel data buffer is set to the head of the second byte. (Step S84), then the NRZ conversion process shown in detail in FIG. 12 is executed (Step S85), and when the NRZ conversion process of the character "2" is completed, the user data active flag is turned on (Step S86),
Then, the process proceeds to the slice layer processing routine.

In the NRZ conversion processing shown in FIG. 12, first,
An end mark is added to the caption data by setting the least significant bit "8" = 1 (step S10).
1), then the NRZ data is initialized (initial value: 0) (step S102), and then the shift counter is initialized (initial value: 8) (step S103). Next, the least significant bit (bit data) of the caption data is taken out (step S104), and then the shift counter is initialized (initial value: 13) (step S105). Then, the logical sum of the NRZ data and the bit data is calculated (step S106), and the shift counter is decremented by 1 (step S107). Next, in step S108, if the shift counter is "0", step S109
On the other hand, if not "0", the process proceeds to step S1.
Jump below 12.

In step S109, the NRZ data is stored in the pixel data buffer, and then the write pointer of the pixel data buffer is advanced by 1 (step S11).
0), and then the shift counter is reset (step S111). Next, the NRZ data is shifted (step S112), and then the bit counter is decremented by 1 (step S113). Next, in step S114, if the bit counter is "0", the process returns to step S106. On the other hand, if the bit counter is not "0", the caption data is shifted to the right by 1 bit (step S1.
15) Then, if it is not the end of the data in step S116, the process returns to step S104, while if it is the end of the data, the process returns to the process shown in FIG.

Next, the process of outputting the closed caption data will be described with reference to FIGS. The VSYNC interrupt routine shown in FIG. 13 starts for each vertical synchronization signal VSYNC, and first reads the value of the vertical / horizontal interpolation coefficient (INTERP COEFF) register (step S121). Next, in the case of the first field, the vertical interpolation coefficient portion of the vertical / horizontal interpolation coefficient (INTERP COEFF) is changed to that for the first field (step S12).
2 → S123), then closed in MPEG mode.
If it is a caption, the vertical interpolation coefficient portion is cleared (steps S124 → S125), and the process proceeds to step S126. If it is not the first field in step S122, the process directly proceeds to step S126.

In step S126, the value of the vertical / horizontal interpolation coefficient is stored. Next, the value of the vertical / horizontal interpolation coefficient register is set in the vertical / horizontal interpolation coefficient control register (step S127). Next, the vertical blank line counter (vblank) is initialized (step S128),
Next, in the case of the closed caption in the MPEG mode, the initial value of the vertical blank line counter (vblank) is decremented by 1 to advance the start of the video image by one line (output at 21H) (steps S129 → S130). Next, a process for initializing the pointer of luminance / color difference data is executed (step S131), and this VSYNC interrupt routine is ended. Here, the vertical blank line counter (vblank) counts down every line, and 2 in the case of closed caption in user data mode.
Vblank = 0 at 1H, and vblank = 0 at 20H in the case of closed caption in MPEG mode.

The HSYNC interrupt routine shown in FIG. 14 is started for each horizontal synchronizing signal HSYNC, and first, in step S141, it is determined whether or not the user data mode is closed caption. If it is not in the user data mode, no processing is performed from 1H to 19H (steps S142 → S146 → S15).
9) Also, in MPEG mode, at 20H,
If it is not in the MPEG mode, the first line data of the video image is output to the base layer at 21H (steps S142 → S146 → S154).

In the case of the closed caption in the MPEG mode, the value of the vertical / horizontal interpolation coefficient register is read at 22H (steps S143 → S144), and then the value is set in the vertical / horizontal interpolation control register (step S145). . Then, the video image output is turned on after 21H in the MPEG mode, and after 22H in the non-MPEG mode. As a result, in the case of the closed caption in the MPEG mode, the closed caption (CC) is output in the section of 21H as shown in FIG.
The video signal is output in the section after 2H. If it is not closed caption, only the video signal is output in the section after 22H.

On the other hand, in the case of the closed caption of the user data mode in step S141, first, no processing is performed from 1H to 19H (steps S147 → S159), and then in 20H, the overlayer is set. Is set as a closed caption (steps S147 → S148 → S159).

Next, at 21H, the pixel data buffer "1" (active data) is selected (step S14).
9 → S150), and if there is no valid pixel data buffer in that buffer, the pixel data buffer “0” (null data) is selected (steps S151 → S).
152), and then output the data in the selected pixel data buffer to the overlayer (step S153),
Next, the data of the first line of the video image is output to the base layer (step S154). After the subsequent 22H, the setting of the overlayer is returned to the original setting (step S15
5 → S156), and then the video image output is turned on (step S157). Therefore, in the case of the closed caption in the user data mode as shown in FIG. 15A, the closed caption (CC) is output in the section of 21H.

[0046]

As described above, according to the present invention, the NRZ data of the closed caption data and the image data are expanded in different areas of the memory by separate processing, and the NRZ data of the closed caption data is transmitted to the television. The user data area of the video CD and DVD is read in the section 21H of the signal and output to the overlayer, and read from the section of the television signal after 22H and output to the base layer so that they are combined on the bus. It is possible to simplify the signal processing when the closed caption data is recorded in and reproduced.

The present invention also stores MPEG mode closed caption data reproduced from a video CD or DVD in the first line of the memory and image data in the second and subsequent lines, and the MPEG mode closed caption data is stored.・ Caption data is 21H of the television signal.
Of the video CD or DVD, the image data is read out and output, and the image data is read out from the section after 22H of the television signal to be combined and output.
It is possible to simplify the memory configuration and processing procedure when recording and reproducing closed caption data in the PEG mode area.

The present invention also does not perform vertical interpolation on the closed caption data in the MPEG mode read in the section 21H, but performs vertical interpolation on image data read from the section 22H and thereafter. MP to do
It is possible to prevent the image from being disturbed when the signal processing of the closed caption data in the EG mode is performed.

[Brief description of drawings]

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

2 is a block diagram showing in detail the MPEG / Photo CD decoder of FIG. 1. FIG.

[Fig. 3] Closed caption (C
C) is an explanatory diagram showing a format of user data.

FIG. 4 is an explanatory diagram showing data lengths of main fields in FIG.

FIG. 5 is a flowchart for explaining a picture layer processing routine.

FIG. 6 is a flow chart for explaining the user data routine of FIG. 5 in detail.

FIG. 7 is a flowchart illustrating in detail the “save user data” process of FIG. 6.

FIG. 8 is a flowchart illustrating in detail the “discard user data” process of FIG. 6.

9 is a flowchart for explaining in detail the "read slice start code" processing of FIG.

FIG. 10 is a flowchart for explaining in detail the “search for slice start code” process of FIG. 6.

FIG. 11 is a flow chart for explaining the caption routine of FIG. 5 in detail.

FIG. 12 is a flowchart illustrating in detail the NRZ conversion process of FIG.

FIG. 13 is a flowchart for explaining the VSYNC interrupt routine in detail.

FIG. 14 is a flow chart for explaining the HSYNC interrupt routine in detail.

FIG. 15 is an explanatory diagram showing output timing of closed caption (CC).

[Explanation of symbols]

1 pickup (RF amplifier 2, CD-decoder / servo control circuit 3, second CPU 4, SP (spindle)
Together with the servo control circuit 11, it constitutes “reproducing means”. )
2 RF amplifier 3 CD-decoder / servo control circuit 4 Second CPU4 6 First CPU4 8 DRAM (first storage means, second storage means, storage means) 9 MPEG / photo CD decoder (along with the first CPU 6, "compressed image data""Processingmeans","closed caption data processing means", "compositing means", and "vertical interpolation means". 11 SP (spindle) servo control circuit

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04N 7/03 H04N 7/13 Z 7/035 7/24

Claims (3)

[Claims] 1. A reproducing device for reproducing compressed image data and user data closed caption data recorded on an optical disc, a first storing device for storing image data, and a reproducing device for reproducing the image data. Image data processing means for decompressing compressed image data and storing it in the first storage means, and N for closed caption data of user data.
Second storage means for storing RZ data, and closed caption data for converting the closed caption data of the user data reproduced by the reproducing means into NRZ data and storing the converted NRZ data in the second storage means. The processing means and the NRZ data stored in the second storage means are read out in the 21H section of the television signal and output to the overlayer, and the image data stored in the first storage means is converted into the television signal. An optical disc reproducing apparatus having a synthesizing unit for synthesizing on a bus by reading from a section after 22H and outputting to a base layer. 2. A reproducing means for reproducing compressed image data and an MPEG mode closed caption data recorded on an optical disc; a storage means for storing the image data and the MPEG mode closed caption data; Image data processing means for storing the closed caption data in the MPEG mode reproduced by the reproducing means in the first line of the storage means, decompressing the compressed image data and storing the compressed image data in the second line and thereafter of the storage means. MPEG mode closed caption data stored in the storage means is read out and output in a section of 21H of the television signal, and image data is read out from a section of the television signal after 22H and a combining section is combined. An optical disc reproducing apparatus having the same. 3. A television signal of 2 from the storage means.
Vertical interpolation is not performed on the closed caption data in the MPEG mode read in the 1H section, and 2
The optical disc reproducing apparatus according to claim 2, further comprising a vertical interpolating unit that performs vertical interpolation on the image data read from the section of 2H and thereafter.