JP3164020B2 - Digital disk playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video CD which can be displayed on a television receiver having a character decoder.
Caption data (text) recorded as part of user data or compressed image data in an MPEG video stream recorded on a digital disk such as a DVD or a digital versatile disk (DVD) on which a compressed image is recorded. And a digital disk reproducing apparatus for reproducing information and outputting the reproduced information to a television receiver.

[0002]

2. Description of the Related Art In general, closed caption data is added to a portion of a video signal that is not displayed,
2. Description of the Related Art A technique for imposing as characters on a screen of a television receiver with a character decoder is known. In this case, out of all the scanning lines 1H to 525H of the television signal, 1H to 525H are used.
21H (264H to 284H) is used as a vertical blanking period, and 22H to 263H (285H to 284H).
525H) is used as a video signal, the broadcasting station sets one of the vertical blanking periods (for example, 2
1H), the character code is transmitted as an NRZ signal, and the NRZ signal is converted into a character image by a character decoder on the receiver side, and is superimposed on the video image and displayed on the screen of the receiver.

Therefore, even in a digital disk such as a video CD or a DVD, "character information" is recorded in a user data area or an MPEG data area, reproduced, and decoded so that a character decoder on the receiver side can decode.
It is conceivable that the signal is converted to an RZ signal, superimposed on 21H of the television signal, and output to the receiver. In this case, when the closed caption data is recorded in the user data area of the digital disc and reproduced, converted to an NRZ signal and superimposed on the 21H of the television signal, it is composed of I, P, B pictures, etc. When the complicated processing of the data stream of the digital disk to be performed and the signal processing such as the NRZ conversion of the closed caption data of the user data are performed at the same time, the processing procedure becomes complicated.

Therefore, the NRZ data of the closed caption data is stored in a buffer, the moving image data is stored in one image memory, and the NRZ data is stored in a single image memory.
The processing procedure can be simplified by reading in the section of H and outputting to the overlayer, and reading out the moving image data in the section of 22H, outputting to the base layer and synthesizing on the bus. In addition, M
In order to record closed caption data in the PEG data area and reproduce it, 22H to 263H
If the area of the closed caption data for 21H is additionally provided to the image data memory for (285H to 525H), the memory configuration becomes complicated, but the processing procedure can be simplified by the same processing. .

[0005]

By the way, as an example of the color processing of the digital disk reproducing device, two adjacent colors are used.
A method of performing vertical interpolation based on the correlation for each line is known. However, if closed caption data is assigned to the first 1H of an image, a lower line interferes with this line, so that closed caption data is assigned. There is a problem that data is distorted.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a digital disk playback system capable of preventing closed captions from being disturbed when closed caption data is recorded in an MPEG data area of a digital disk and played back. It is intended to provide a device.

[0007]

According to the present invention, in order to achieve the above-mentioned object, of image data reproduced from a digital disk, image data corresponding to lines 21H and 22H of a television signal is converted to black and white. The image data corresponding to the even-numbered line after 22H and the next odd-numbered line are vertically interpolated.

That is, according to the present invention, a judging means for judging whether or not a closed caption exists in image data reproduced from a digital disk, and a case where the judging means judges that a closed caption exists. In the image data reproduced from the digital disk, the image data corresponding to the lines 21H and 22H of the television signal is converted to black and white, and the image data corresponding to the even lines after 22H and the next odd lines are vertically interpolated. And a vertical interpolating means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment (in the case of a video CD playback device) of a digital disk playback device according to the present invention, FIG. 2 is a block diagram showing the MPEG / photo CD decoder of FIG. 1 in detail, and FIG. FIG. 4 is an explanatory diagram showing a format of closed caption (CC) user data of FIG. 4, FIG. 4 is an explanatory diagram showing data lengths of main fields in FIG. 3, FIG. 5 is a flowchart for explaining a picture layer processing routine, and FIG. FIG. 7 is a flowchart for explaining the user data routine of FIG. 5 in detail; FIG. 7 is a flowchart for explaining the “save user data” process of FIG. 6 in detail;
8 is a flowchart for explaining in detail the "discard user data" process in FIG. 6, FIG. 9 is a flowchart for explaining the "read slice start code" process in FIG. 6, and FIG. 11 is a flowchart for explaining in detail the "search for slice start code" processing, FIG. 11 is a flowchart for explaining the caption routine of FIG. 5 in detail, and FIG. 12 is a flowchart for explaining the NRZ conversion processing of FIG. 11 in detail. 13, FIG. 13 is a flowchart for explaining the VSYNC interrupt routine in detail, FIG. 14 is a flowchart for explaining the HSYNC interrupt routine in detail, FIG. 15 is an explanatory diagram showing the output timing of the closed caption (CC), and FIG. Describes vertical interpolation processing as an example of color processing. It is a flow chart for.

The video CD reproducing device shown in FIG. 1 is a dual-purpose device capable of reproducing a music-only CD as an example. Information recorded on a disk D of a video CD or a music-only CD is read by a pickup 1, and its signal is amplified by an RF amplifier 2 and applied to a CD-decoder / servo control circuit 3. The CD-decoder / servo control circuit 3 causes the SP (spindle) servo control circuit 11 to perform the rotation control of the disk motor, the focus control of the pickup 1, and the like, and the EFM from the RF amplifier 2.
Demodulate signals and read subcode data.

[0011] The second CPU 4 is provided with the TOC (Tabl
e-of-contents) having a memory for temporarily storing the data read from the area in a predetermined table format, taking in the subcode data, and controlling the CD-decoder / servo control according to the input information from the input instructing section 5. The circuit 3 is controlled. The input instruction unit 5 includes, for example, a PLAY button, a STOP button, an FF button,
RF button, DIGEST button, J
The display unit 20 has a UMP (jump) button and the like, and displays an operation mode, 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 music-only CD.

A circuit system shown in a dashed line is a video CD provided in addition to the signal system of the music-only CD.
Signal system for the first CPU 6, ROM 7, DRAM
8, MPEG / photo CD decoder 9, video signal processing circuit (SSG) 10, NTSC / PAL encoder 2
3. It has crystal oscillators 21, 24 and 25. 1st CPU
Reference numeral 6 controls the entire apparatus by controlling the second CPU 4 and the MPEG / photo CD decoder 9.

The MPEG / photo CD decoder 9 has a ROM 7 in which a program for controlling the entire apparatus is stored in advance, and a video CD input from the CD-decoder / servo control circuit 3 via a 4-bit data bus b1.
A DRAM 8 for storing a compressed signal for use is provided to restore the compressed signal to image data necessary for displaying a normal one screen, or to expand an audio signal.

MPEG / Photo CD decoder 9 and 1C
Between the PU 6 and the PU 6, mode information is transmitted and a decoder 9 is transmitted.
An 8-bit data bus b2 for obtaining a status, which is the processing status of the program in the data bus, a 7-bit data bus b3 for transmitting and receiving control information for transmitting and receiving data address information of the data and the decoder 9; 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 bit data bus b5.

The video signal processing circuit 10 converts a digital audio signal demodulated by the decoder 9 into an analog signal, or converts an RGB signal, a luminance signal and a color difference signal into a composite signal, and converts the signal into an NTSC / PAL encoder 2.
The NTSC / PAL encoder 23 converts the composite signal into an NTSC or PAL 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 generates a master clock for the video signal processing circuit 1.
A crystal clock 25 generates a clock of 13.5 MHz or 27 MHz suitable for the processing of 0, and the crystal oscillator 25 transmits a 3.579945 MHz (NTSC) which is a color subcarrier to the encoder 23.
Or 4.44431875 MHz (PAL).

Next, referring to FIG. 2, MPEG / photo C
The D decoder 9 will be described in detail. The decoder 9 includes a RISC processor 31, a variable length code decoder (VLD) (not shown), and three interfaces 33 to 3.
The RISC processor 31 not only controls the VLD and the interfaces 33 to 35, but also controls the MPEG1
Or decoding of MPEG2 syntax, two-dimensional IDCT,
Performs inverse quantization, motion vector calculation, and the like.

As interfaces 33 to 35, a host bus interface (IF) 33 inputs a compressed data stream and sets an internal register, a video display processor 34 outputs a decoded image, and a DRAM controller 35 Control. The DRAM 8 is used as a rate buffer, a reference image memory, a display memory, and a command memory for RISC.
A pixel data buffer "1" for storing valid image data of caption data, a pixel data buffer "0" for storing a pull-in signal when closed caption data is not valid, and an MPE.
It has a moving image buffer (V-RAM) for storing closed caption data and moving image data in G mode.

Here, the pull-in signal of the pixel data buffer "0" is read out 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 the case of. 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.

Further, the closed caption data in the user data mode 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, the other is valid, and writing and reading are controlled by 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 of MPEG2. The actual pixel rate is about 3.3 MHz assuming an 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 MPEG video stream, from the highest layer to the lowest layer, is: sequence layer, group of picture layer, picture layer, slice layer, macro block layer, and block layer. Although this embodiment is composed of layers, the present embodiment particularly relates to processing at the picture layer and below.

[0021]

After processing the sequence layer and the group of picture layer, 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 Pell Forward Vector (Full P
el Foward Vector)-FFC: Forward F Code-FPBV: Full Pell Backward Vector (Full P
el Backward Vector) ・ BFC: Backward F Code (Backward F Co
de)-EBP: Extra Bit Picture
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

The closed caption (CC) user data of the video CD is recorded in the chapter VII. According to FIG. 4, as shown in detail in FIG. 3, it is composed of two fields of zero bytes, one field of user data start code (UDSC), and N fields of user data groups, and the data length of each field. Is, as shown in FIG. 4, zero byte is one byte,
The user data start code has 4 bytes, and the user data group has a variable length.

As shown in FIG. 3, each user data group has a tag name and a user data group length (U
Length) and each field of CC user data, and the data length of each field is as shown in FIG.
The tag name and the user data group length are both 1 byte, and the CC user data is (user data group length-
2) bytes. Further, the CC user data is composed of EIA-608 characters for two fields,
This one 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 executing the necessary processing (not shown) of the picture layer described above, the data of 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 it is enabled, the process proceeds to step S3. If it is 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 case of 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 in 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, a start code is read,
Next, it is determined whether or not the code is an ESC (extension start code) (step S10a).
If it is SC, the process returns to step S9.
If not, the process proceeds to step S10b. Step S1
At 0b, it is determined whether or not the code is a UDSC (user data start code). If the code is a UDSC, the process proceeds to a user data routine shown in detail in FIGS. And the caption routine detailed in FIG.

In the user data routine shown in FIG.
First, the tag name (1 byte) and the user data group length (1 byte) in the user data group shown in FIGS.
Byte) in 16-bit length (step S1).
1), then the upper byte of this data (tag name =
0x11) is taken out (step S12), then the lower byte (user data group length) is taken out (step S13), and 2 (bytes) is subtracted from the user data group length (step S14).

Next, it is determined whether or not the closed caption is in the user data mode (step S15). Then, in the case of YES, in the case of scan information data (tag name = 0x10) in steps S16 to S19, a "discard user data" process shown in detail in FIG. 8 is executed, and the process returns to step S11. Closed caption data (tag
When (name = 0x11), the "save user data" process shown in detail in FIG. 7 is executed, and the process returns to step S11. Otherwise, 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) is found 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. , Closed caption data (tags,
When (name = 0x11), the process of "discarding user data" shown in detail in FIG. 8 is executed, and the process returns to step S11. Otherwise, the process proceeds to step S24.

In the following step S24, it is determined whether or not the end of the user data (tag name = 0). If YES, the "read slice start code" process shown in detail in FIG. On the other hand, in the case of NO, a "search for slice start code" process shown in detail in FIG. 10 is executed, and the process proceeds 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 in the DRAM 8 is read.
It is stored in the FO area (step S32), and then the write pointer of the user data FIFO area is advanced by one (step S33). Next, if the value of the write pointer is not correct, it is corrected (step S34 → S35), and then 2 (bytes) is subtracted from the user data group length (step S36). Next, when the user data group length is “0”, the process returns from step S37 to step S31, and when it is not “0”, the process returns from step S37 to step S11 shown in FIG.

In the "discard user data" process shown in detail in FIG. 8, the user data is read in 16-bit length (step S41), and then 2 bits from the user data group length.
(Byte) is subtracted (step S42). Next, if the user data group length is not “0”, step S
From step 43, the process returns to step S41. On the other hand, if it is "0", the process returns from step S43 to step S11 shown in FIG.

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

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

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

In the case of the user data mode in step S74, the data (C
C user data) (step S75), then advances the read pointer by one (step S76), and if the read pointer is not correct, corrects the read pointer (step S77 → S78). Next, the updated read pointer is stored (step S79), the upper byte (character "1") of the CC user data is extracted (step S80), and the write pointer of the pixel data buffer is set at the head of the first byte. (Step S81) 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 extracted (step S83), and the write pointer of the pixel data buffer is set to the head of the second byte. (Step S84). Next, the NRZ conversion processing shown in detail in FIG. 12 is executed (step S85), and when the NRZ conversion processing of the character “2” ends, the user data active flag is turned on (step S8).
6) Then, proceed to the slice layer processing routine.

In the NRZ conversion process shown in FIG.
By setting the least significant bit “8” to 1, an end mark is added to the caption data (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 extracted (step S104), and the shift counter is initialized (initial value: 13) (step S105). Next, the logical sum of the NRZ data and the bit data is calculated (step S106), and the shift counter is decremented by one (step S107). Next, when the shift counter is "0" in step S108, step S109
Proceeds to the following, on the other hand, if not “0”, step S1
Jump to 12 or less.

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 one (step S11).
0), and then reset the shift counter (step S111). Next, the NRZ data is shifted (step S112), and then the bit counter is decremented by one (step S113). Next, in step S114, if the bit counter is "0", the process returns to step S106, while if the bit counter is not "0", the caption data is shifted right by one bit (step S115). Next, if it is not the end of the data in step S116, the process returns to step S104.
In the case of the end of the data, the process returns to the process shown in FIG.

Next, a process of outputting data including a closed caption 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 for the first field (step S122 → S123), and then, in the case of the closed caption in the MPEG mode, the vertical interpolation is performed. The coefficient portion is cleared (step S124 → S125), and step S126
Proceed to. If it is not the first field in step S122, the process directly proceeds to step S126.

In step S126, the values of the vertical / horizontal interpolation coefficients are 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 (v blank) is initialized (step S12).
8) Then, in the case of the closed caption in the MPEG mode, the initial value of the vertical blank line counter (v blank) is decremented by 1 in order to make the start of the video image one line earlier (to output at 21H) (step S12).
9 → S130). Next, processing for initializing the pointer of the luminance / color difference data is executed (step S131), and the VSYNC interrupt routine is terminated. Here, the vertical blank line counter (v blank) counts down for each line, and in the case of closed caption in the user data mode, v blank becomes 0 at 21H, and 20H in the case of closed caption in the MPEG mode. And v blank = 0.

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

If the caption is the closed caption in the MPEG mode, the value of the vertical / horizontal interpolation coefficient register is read at 22H (step S143 → S144), and 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 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.
A reproduced video signal from the digital disk is output in a section after 2H. If it is not a closed caption, only the reproduced video signal from the digital disk is output in the section after 22H.

On the other hand, if the caption is the closed caption in the user data mode in step S141, first, no processing is performed from 1H to 19H (step S147 → S159), and then the overlayer is set in 20H. 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) Then, if there is no valid pixel data buffer in the buffer, the pixel data buffer “0” (null data) is selected (step S151 →
S152). Next, the data of the selected pixel data buffer is output to the overlayer (step S15).
3) Then, the data of the first line of the video image is output to the base layer (step S154). Continued 22
After H, the setting of the overlayer is restored (step S155 → S156), and then the video image output is turned on (step S157). Therefore, FIG.
As shown in FIG.
If it is a caption, a closed caption (CC) is output in the section of 21H.

Next, the vertical interpolation processing will be described with reference to FIG. The processing shown in FIG.
The video image output is turned on in the YNC interrupt routine, and it is checked whether or not closed caption data exists in the MPEG data area reproduced from the digital disk. First, in step S161, it is determined whether or not 21H is set.
That is, it is checked whether or not the line is a closed caption line in the MPEG mode. Then, in the case of 21H, the line is converted to a black-and-white image (step S162), and then the process proceeds to step S166. If it is not 21H in step S161, it is checked whether it is 22H, that is, whether it is the first line of the TV image. If it is 22H, the line is converted to a black and white image (step S164), and then the process proceeds to step S165. In the monochrome image forming process, the luminance data Y is left as it is, and the color difference data Cb, Cb
r is converted to a fixed value “80” (hexadecimal).

In step S165, 22H and 23H, 2
The luminance data Y and the chrominance data C corresponding to the even-numbered line after 22H, such as 4H and 25H, and the next odd-numbered line.
b and Cr are vertically interpolated, and the process proceeds to step S166. In step S166, it is checked whether or not the final Hmax to be subjected to the vertical interpolation processing is performed. If NO, H is incremented by one in step S167 and the process returns to step S161. On the other hand, if YES, the vertical interpolation processing is terminated. I do. Here, when 22H and 23H are vertically interpolated, one 22H is a monochrome image (color difference data Cb and Cr are fixed values).
However, it is not visually obstructive.

[0048]

As described above, according to the present invention, of the image data reproduced from the digital disk such as a video CD or a DVD, the television signals 21H and 22H are included.
The image data corresponding to the line H is converted to black and white,
Since the image data corresponding to the even-numbered line after 2H and the next odd-numbered line are vertically interpolated, closed caption data is recorded in the compressed image data area of the MPEG video stream recorded on the digital disk. , It is possible to prevent closed captions from being disturbed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment (in the case of a video CD playback device) of a digital disk playback device according to the present invention.

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

FIG. 3 is a closed caption (C) of a video CD.
C) is an explanatory diagram showing a format of user data.

FIG. 4 is an explanatory diagram showing a data length of a main field in FIG. 3;

FIG. 5 is a flowchart illustrating a picture layer processing routine.

FIG. 6 is a flowchart illustrating a user data routine of FIG. 5 in detail;

FIG. 7 is a flowchart for explaining in detail a “save user data” process of FIG. 6;

FIG. 8 is a flowchart for explaining in detail a “discard user data” process in FIG. 6;

FIG. 9: “Read slice start code” of FIG.
It is a flowchart for explaining a process in detail.

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

FIG. 11 is a flowchart illustrating the caption routine of FIG. 5 in detail.

FIG. 12 is a flowchart illustrating the NRZ conversion processing of FIG. 11 in detail.

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

FIG. 14 is a flowchart illustrating the HSYNC interrupt routine in detail.

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

FIG. 16 is a flowchart illustrating vertical interpolation processing as an example of color processing.

[Explanation of symbols]

Reference Signs List 1 pickup 2 RF amplifier 3 CD-decoder / servo control circuit 4 second CPU 5 input instruction unit 6 first CPU 7 ROM 8 DRAM 9 MPEG / photo CD decoder (along with first CPU 6, constitutes "judgment means" and vertical interpolation means) 10) Video signal processing circuit (SSG) 11 SP (spindle) / servo control circuit 15 Audio signal processing circuit 20 Display unit 21, 24, 25 Crystal oscillator 23 NTSC / PAL encoder 31 RISC processor 33 Host bus interface (I / F) ) 34 Video display processor 35 DRAM controller D disk

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/85 H04N 5/91-5/956 H04N 9/79-9/898 H04N 7 / 025,7 / 03,7 / 035

Claims (1)

(57) [Claims] 1. A determining means for determining whether or not a closed caption exists in image data reproduced from a digital disk, and reproducing from the digital disk when the determining means determines that a closed caption exists. 21H and 22H of the television signal out of the
Of the image data corresponding to the line
A digital disc reproducing apparatus comprising: an even-numbered line after H; and vertical interpolation means for vertically interpolating image data corresponding to the next odd-numbered line.