JP2002158966A - Recording device and its method, recording medium as well as reproducing device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record pattern data (character data) positioned on an arbitrary horizontal scanning line. SOLUTION: Video data and audio data are integrated into a PES packet of an MPEG-2, and recorded. Also, pattern data (character data) are integrated into the PES packet of Private stream 1 of the MPEG-2. The headers of the respective PES packets are recorded with ID indicating the video packet, audio packet, or pattern data packet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording digital video data on a disc together with character data, for example.
The present invention relates to a recording apparatus and method, a recording medium, and a reproducing apparatus and method suitable for use in reproducing.

[0002]

2. Description of the Related Art A television screen is constituted by a plurality of horizontal scanning lines. For example, in the case of the NTSC system, a screen of one frame is constituted by 525 horizontal scanning lines. Further, in the NTSC system, since an interlaced system is adopted, one frame is a screen of an odd field and an even field. It consists of.

The horizontal scanning lines are sequentially scanned from the upper left to the lower right. When the horizontal scanning lines reach the right end of the screen, they must be returned to the left end of the screen. . When the horizontal scanning line reaches the lower edge of the screen, it is necessary to return the horizontal scanning line to the upper edge. For this reason, a blanking period for returning the horizontal scanning lines occurs in the horizontal direction and the vertical direction. As a result, as shown in FIG. 9, in each screen of the odd field and the even field,
The area where the image is displayed (effective area) is substantially smaller than the area actually scanned.

Therefore, for example, when a video signal is digitized and recorded on a recording medium, only data in an effective area is encoded in order to reduce the code amount. For example, in the odd field, as shown in FIG. 9A, 240 horizontal scanning lines from the 21st horizontal scanning line to the 260th horizontal scanning line are set as effective lines. As shown in b), in the even-numbered field, 240 horizontal scanning lines from the 284th horizontal scanning line to the 523th horizontal scanning line are regarded as effective lines, and only the video signal of this effective line is encoded. I am trying to do it.

FIG. 10 shows an effective line as an area in a time-varying signal. As shown in the figure, each time the vertical synchronization signal (VSYNC) is generated, the FID signal representing the odd field and the even field is inverted. In the odd field, 240 lines (H) from the 21st line (H) to the 260th line (H) are set as effective lines, and in the even field, the 284th line (H) to the 523th line (H) are used. ) Are the valid lines.

[0006] Of these video signals, character data and the like are superimposed and transmitted on horizontal scanning lines in a blanking area so as not to affect the original image in the effective area. In Japan, the captain system, in Europe, the teletext system, in the United States, the closed caption system and EDS (Extended Data Serv
ices) are known.

Note that the character data here includes not only characters such as alphabets and numbers, but also mosaic-like bitmaps used in, for example, a captain system. Hereinafter, these data are referred to as pattern data.

For example, it is defined that pattern data (caption data) is recorded at 21H in a closed caption system, 21H in an odd field and 284H in an even field in EDS.

[0009] When the EDS data is recorded by a helical scan video tape recorder, the recording state is as shown in FIG. 11, for example.
As shown in this figure, in this case, both 21H and 284H on which pattern data is recorded are recorded on the tape.

Therefore, for example, a video signal recorded on such a video tape is reproduced, and MPEG (Movin) is reproduced.
g Pictures Expert Group)-
In the video CD standard, when coding is performed based on the video CD standard using 1 and the pattern data is recorded, the effective line in the case of recording the pattern data is 21H to 260H in the odd field and in the even field, Is defined as 284H to 523H, so that not only the original video but also the pattern data can be digitally recorded on the disc.

[0011]

SUMMARY OF THE INVENTION However, MPE
In the video CD standard, which is one of the applications of G-1, an effective line is defined to include a line for inserting pattern data in closed caption and EDS, so that the pattern data can be recorded on a disc. However, if the pattern data is inserted in a blanking period before 21H or a blanking period before 284H, for example,
There is a problem that the pattern data cannot be recorded on the disk.

Further, the applicant of the present invention has disclosed, for example,
No. 54706, it was previously proposed to digitally record a video signal on a disc based on the MPEG-2 standard. In the future proposal, unnecessary data (pattern data) other than the original image is not recorded so that the image can be recorded and reproduced with as high quality as possible. That is, the 21st and 28th
4H is not recorded, the effective line in the odd field is 240H from 22H to 261H, and the even line is 240H from 285H to 524H.

In order to obtain such a high-quality image, it is necessary to prepare another means for recording pattern data.

The present invention has been made in view of such a situation, and it is an object of the present invention to record and reproduce pattern data inserted on a horizontal scanning line at an arbitrary position. Further, it enables recording and reproduction of pattern data without deteriorating the image quality as compared with the means used in the video CD standard using MPEG-1.

[0015]

According to the present invention, there is provided a recording apparatus comprising: encoding means for encoding moving image data to be input; and generating means for generating caption data to be superimposed during a predetermined blanking period during reproduction. Multiplexing means for generating a data stream composed of encoded moving image data and caption data, and recording means for recording the data stream on a recording medium.

In the case of the NTSC system, the caption data may be character data arranged on the 21st horizontal scanning line in an odd field.

In the case of the NTSC system, the moving image data may be character data arranged in a predetermined number of horizontal scanning lines from the 22nd onward in an odd field.

In the case of the NTSC system, the caption data may be data of the 284th horizontal scanning line in an even field.

In the case of the NTSC system, the moving image data can be data of a predetermined number of horizontal scanning lines after the 285th in the even field.

The recording method of the present invention encodes input moving image data, generates caption data to be superimposed during a predetermined blanking period during reproduction, and multiplexes the encoded moving image data with caption data. And generating the encrypted data stream and recording the data stream on a recording medium.

[0021] The recording medium of the present invention is characterized in that a data stream comprising encoded moving image data and caption data superimposed on blanking during reproduction is recorded in a data recording area. I do.

According to the present invention, there is provided a reproducing apparatus for reproducing a data stream from a recording medium, a separating means for separating moving picture data and caption data encoded from the reproduced data stream, and a separated code. Decoding means for decoding the coded moving image data, generating means for generating a video signal having blanking according to the decoded moving image data, and superimposing caption data separated in a predetermined blanking period of the video signal. And a superimposing means for performing the operation.

In the case of the NTSC system, the caption data may be character data arranged on the 21st horizontal scanning line in an odd field.

In the case of the NTSC system, the moving image data can be data of a predetermined number of horizontal scanning lines from the 22nd onward in the odd field.

In the case of the NTSC system, the caption data may be character data arranged on the 284th horizontal scanning line in an even field.

In the case of the NTSC system, the moving image data can be data of a predetermined number of horizontal scanning lines of the 285th or later in an even field.

The reproducing method of the present invention reproduces a data stream from a recording medium, separates encoded moving image data and caption data from the reproduced data stream, and decodes the separated encoded moving image data. And generating a video signal having blanking in accordance with the decoded moving image data, and superimposing caption data separated in a predetermined blanking period of the video signal.

In the recording apparatus and the recording method of the present invention, a data stream obtained by multiplexing encoded moving image data and caption data is recorded on a recording medium.

In the recording medium of the present invention, a data stream including encoded moving image data and caption data is recorded in a data recording area.

In the reproducing apparatus and the reproducing method of the present invention, moving image data and caption data are separated from the reproduced data stream. The caption data is superimposed during a blanking period of the video signal.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention encodes video data and pattern data in accordance with the MPEG standard, multiplexes the data, records it on a recording medium, and reproduces it. It is specified as follows.

MPEG-1 system: ISO117172-1 MPEG-1 video: ISO117172-2 MPEG-1 audio: ISO11172-3 MPEG-2 system: ISO13818-1 MPEG-2 video: ISO13818-2 MPEG-2 audio1 3

FIG. 1 shows an effective line in the present invention. As shown in FIG.
In the case of the TSC system, in an odd field, 22H
240H from 285H to 261H are regarded as valid lines.
40H is an effective line. As will be described later, when the video data is digitized and recorded on the data recording medium 19 (disk), only the video signal of the effective line is encoded and recorded. Therefore, the number of effective lines is the same as that in the video CD standard which is one of the above-mentioned MPEG-1 applications, and compatibility can be ensured.

However, as described above, this makes it impossible to record pattern data inserted in, for example, the odd field 21H or the even field 284H. Therefore, in this embodiment, video data, audio data, and pattern data (character data) are respectively converted into PES (Packetized Elemental) in accordance with the format specified in the MPEG-2 system.
y Stream) packet (video packe)
t, audio packet, private _- st
(ream _- type1 packet).

The PES packet is composed of a header and an actual data part, and the header includes an MPEG-2 system.
em, the ID (stream-i
d), PTS (Presentation Time)
Stamp) and DTS (Decoding Tim)
e Stamp) is arranged. In the actual data portion, video data is arranged in the case of a video packet, and audio data is arranged in the case of audio data. In the case of a pattern data packet, as shown in FIG. 2, a type code, a horizontal scanning line number, a data length, and data are arranged.

The ID indicates that the packet is a video packet,
A number (ID) indicating whether the packet is an audio packet or a pattern data packet is described. The numbers described here are defined in the MPEG-2 system as shown in FIG. That is, in the case of a video packet, it is set to 1110xxxx, and in the case of an audio packet, it is set to 110xxxx. And
In the case of a pattern data packet, it is set to 10111101. That is, the pattern data is MPEG-2 system
em, a packet defined as Private _- stream _- 1.

The PTS is displayed on the display (Presentatio).
n) is a time stamp (time information) indicating the timing, and DTS is a time stamp indicating the decoding (decoding) timing. In this embodiment, since the delay from decoding to display is set to 0, PTS and DTS have the same value.

The type code in the actual data portion of the pattern data packet is, for example, closed caption, E
A code for identifying a DS, a captain, a teletext, or the like, which is, for example, 4 bits.

The horizontal scanning line number indicates the position of the horizontal scanning line where the pattern data is inserted. For example, it is 21 in a closed caption system, 21 in an odd field in the EDS, and 284 in an even field. . The horizontal scanning line number is PAL
In consideration of the use in, 8 bits are insufficient, and therefore, for example, 16 bits. By setting this horizontal scanning line number to an arbitrary value, pattern data (character data) can be inserted on the horizontal scanning line at an arbitrary position.

However, in the case where a limitation that a pattern (character) is not displayed in the effective area is added,
For example, if the number of bits of this horizontal scanning line number is 8 bits,
The 6 bits on the LSB side are used to represent the number of horizontal scanning lines from 1H to 64H, and the 2 bits on the MSB side are used to indicate the number of horizontal scanning lines from the upper end or the number of horizontal scanning lines from the lower end. It can be described whether there is.

The data length indicates the length of the following data. The data length varies depending on the type of pattern data. For example, in the case of a closed caption in the United States, the data length can be 2 bytes. In the case of a pattern like a captain, it is preferable to secure a longer bit. .

The data represents character data to be displayed. For example, if one character is recorded in one frame, 30 characters can be recorded and reproduced in one second.

In the embodiment of FIG. 2, pattern data (character data) of one line (for example, 21H) is written in one packet, but data of a plurality of lines is written in one packet, for example. Can be FIG. 4 shows an embodiment in this case. That is, in this embodiment, the type code, the horizontal scanning line number, the data length, and the data having PTS and DTS common to the actual data portion are recorded for two lines.

Furthermore, it is possible to write data (for example, 21H data over several frames) that is continuously transmitted over several frames with data for a specific scanning line in one packet. FIG.
An example in this case is shown.

In the embodiment shown in FIG. 5, the header D
In the TS, the DTS of the first character string is described. And
Since a plurality of pattern data are described as the data of the actual data part, D is added between the data length of the actual data part and the data.
A TS offset is arranged. The data length in FIG. 5 indicates the length of a character string to be reproduced at one time, and the DTS offset indicates how long each character string to be reproduced at one time should be displayed with a delay. Things. Therefore, each character string is displayed at intervals specified by the DTS offset from the first DTS. In other words,
The pattern data includes data displayed at the timing of DTS, data displayed at the timing of DTS + S, D
Data displayed at the timing of TS + 2S, DTS +
The data is displayed at the timing of 3S.

In the closed caption system in the United States, only two bytes are used for one screen. Therefore, for example, as shown in FIG. 2, if one packet is recorded in order to describe 2-byte character data for each frame, it is necessary to add a header (several bytes or more) to each packet. Therefore, the coding efficiency is deteriorated. However, as shown in FIG. 5, if a large number of closed caption data are collectively described in one packet, coding efficiency can be improved.

Next, a data recording apparatus to which the data multiplexing apparatus of the present invention is applied will be described with reference to FIG.

The data recording device 1 of this embodiment multiplexes and adds video data, audio data, caption data (synonymous with the above-mentioned pattern data), or data obtained by combining any of them, in advance. Information (subcode) is added and recorded on the data recording medium 19.

In the data recording device 1, the master data transmitting device 2 receives a command from the control device 20 and converts the previously produced video data, audio data and caption data into a video encoder 5, an audio encoder 6 and a caption encoder 7, respectively. To send to. The master data transmission device 2 is composed of, for example, a commercial video tape player. If time code information is present together with video data, audio data, and caption data, the master data transmission device 2 transmits the time code information to the time code information switching circuit 10.

In addition to the master data transmission device 2, caption data from a caption generator (not shown) may be supplied to the caption encoder 7 in order to newly add caption data.

The video encoder 5 converts the video data sent from the master data sending device 2 into MPEG-2 data.
The data is encoded according to the encoding procedure specified in the video, and transmitted to the multiplexing circuit 8. Also, entry point information indicating the position where the I picture data is located, picture header information indicating the position where the picture header is located, the type of the picture (I picture (code picture in claim), P picture (forward prediction code picture), B picture (bidirectional It sends to the sub-code encoder 11 picture type information indicating a predicted code picture)), temporary reference information in which a temporary reference number is recorded, and the like.

The audio encoder 6 encodes the audio data sent from the master data sending device 2 as it is or by an encoding procedure specified in MPEG-2 audio, and sends it to the multiplexing circuit 8.

The caption encoder 7 digitizes the caption data sent from the master data sending device 2 as it is, or converts the data sent from the master data sending device 2 in analog form into a multiplexing circuit 8.
Send to Also, the P shown in FIG. 2, FIG. 4 or FIG.
The data relating to the type code of the ES packet, the horizontal scanning line number, and the data length are output to the multiplexing circuit 8.

The header generation circuit 4 receives signals from the video encoder 5, the audio encoder 6, and the caption encoder 7, and outputs the header ID, PTS, and PES of the PES packet shown in FIG. 2, FIG. 4, or FIG. The data corresponding to the DTS is sent to the multiplexing circuit 8.

The multiplexing circuit 8 converts the data sent from the video encoder 5, the audio encoder 6, and the caption encoder 7 into an MPEG-2 system.
It multiplexes according to the rules of em. At this time, the multiplexing circuit 8 sends, from the control device 20, an instruction of the processing unit of data that can be read from or written to the data recording medium 19, that is, the size of one sector of user data. In response to this, multiplexing is performed so that one packet does not extend over user data in a plurality of sectors, and the multiplexed data is written in ECC (Er).
rr Correction Code). At the same time, a sector boundary signal indicating the boundary between sectors is also sent to the ECC encoder 15.

The time code information generator 9 includes a control device 20
Generates time code information in response to a command from The time code information switching circuit 10 selects one of the time code information sent from the master data sending device 2 and the time code information sent from the time code information generator 9 and sends it to the subcode encoder 11. .
However, when time code information is sent from the master data transmission device 2, the time code information is selected,
If there is no time code information sent from the master data transmission device 2, the time code information sent from the time code information generator 9 is selected.

The sub-code encoder 11 includes a control device 20
Is encoded in a predetermined format, and the CRC (Cyclic).
Redundancy Check) Encoder 12
To send to. Here, the other additional information includes copyright management information, time code information sent from the time code information switching circuit 10, entry point information sent from the video encoder 5, picture header information, picture type information, and temporary information. Reference information.

The CRC encoder 12 calculates the CRC of the subcode information sent from the subcode encoder 11, adds the CRC data to the subcode information,
It is sent to the synchronization pattern adding circuit 13. The synchronization pattern adding circuit 13 adds a synchronization pattern to the input data and sends the data to the subcode buffer 14.

The ECC encoder 15 calculates the parity calculated by the Reed-Solomon code, that is, the ECC, from the multiplexed data sent from the multiplexing circuit 8 and adds it to the multiplexed data to add a subcode. Additional circuit 16
To send to. The EEC encoder 15 receives the sector boundary signal from the multiplexing circuit 8 and sends the sector boundary signal to the subcode adding circuit 16 so as to correspond to the sector boundary of the data to which ECC has been added.

The sub-code adding circuit 16 generates a sub-code based on the sector boundary signal sent from the ECC encoder 15.
The subcode information read from the subcode buffer 14 is inserted at the sector boundary in the data sent from the ECC encoder 15. Further, the subcode adding circuit 16 converts the data after the subcode information is inserted into
The signal is sent to the modulation circuit 17. The modulation circuit 17 is a circuit that modulates the data sent from the subcode addition circuit 16 so that the data is converted into a signal format that can be recorded on the data recording medium 19, for example, EFM (Eight to Fourteen).
n Modulation). The writing device 18 converts the signal sent from the modulation circuit 17 into an electric signal,
The data is magnetically, optically and physically recorded on the data recording medium 19. In this embodiment, the data recording medium 19 is a disk (digital video disk).

Next, the operation of the embodiment shown in FIG. 6 will be described. First, the control device 20 outputs a data transmission instruction to the master data transmission device 2 according to an editing instruction from the user. Further, it instructs the multiplexing circuit 8 on the size of the sector, generates sector number information and copyright management information for recording in the subcode, and supplies the generated information to the subcode encoder 11. Further, when time code information is not sent from master data transmission device 2, control device 20 instructs time code information generator 9 in accordance with a command from the user to generate time code information.

The video encoder 5 encodes (inputs) the input video signal according to MPEG-2 video. At this time, as described above, the video encoder 5 sets 22H to 26
1H effective line data is encoded, and in even fields, effective line data of 285H to 524H is encoded. Then, it sends to the subcode encoder 11 picture type information indicating the type of the encoded picture (I picture, P picture, or B picture) and a temporary reference number. When a picture header is transmitted, information indicating the presence of a picture header, that is, picture header information, and when an I picture is further transmitted, information indicating the presence of an I picture header, that is, entry point information is sub-code. Send to encoder 11.

The audio encoder 6 and the caption encoder 7 encode the input audio signal and caption signal, respectively, and send them to the multiplexing circuit 8. Further, the caption encoder 7 further outputs data relating to the type code of the pattern data, the horizontal scanning line number, and the data length to the multiplexing circuit 8. The multiplexing circuit 8 adds the data output from the header generating circuit 4 to each data sent from the video encoder 5, the audio encoder 6, and the caption encoder 7 as a header, and complies with the MPEG-2 system. It is multiplexed in the PES packet format.

FIG. 7 shows an example of a multiplexing process in the multiplexing circuit 8. As shown in the figure, first, in step S1, data input from the video encoder 5, the audio encoder 6, or the caption encoder 7 is packetized in a PES packet format. In a video packet or an audio packet, encoded video data or audio data is described in an actual data portion of the packet. In a pattern data packet, the encoded data is shown in FIG. 2, FIG. 4, or FIG. As described above, in addition to the pattern data, the type code, the horizontal scanning line number, and the data length are described.

Next, in step S2, the type of data is determined, and if the data is video data input from the video encoder 5, step S3
Then, 1110xxxx representing video data is described as the ID of the packet header. This xx
For xx, a predetermined value set in advance is used. The PTS and DTS of the video data are further added to this header.

If the input data is audio data input from the audio encoder 6, the process proceeds to step S4, where 110xxxx is added as the ID of the packet header. This indicates that this packet is a packet of audio data. The header further includes a P of the audio data.
TS and DTS are added.

Further, when it is determined in step S2 that the input data is caption data (pattern data) input from the caption encoder 7, the process proceeds to step S5, where the ID of the private stream type 1 is 10111101. Is added as the ID of the packet header. This indicates that this packet is a packet including caption data. This header contains the PTS of the pattern data.
And DTS are further added.

After steps S3 to S5, step S6
And time-division multiplexes the packets to which the corresponding IDs are added, and outputs them as a stream.

The user data packetized for each sector by the multiplexing circuit 8 is sent to the ECC encoder 15.
The ECC encoder 15 calculates the ECC of the transmitted user data, adds the ECC immediately after the user data, and sends it to the subcode adding circuit 16.

The multiplexing circuit 8 also outputs a sector boundary signal which becomes "1" only when transmitting the first byte of the user data, that is, a sector boundary, and which becomes "0" otherwise. Send to The ECC encoder 15 holds the received sector boundary signal, and when sending data to the subcode adding circuit 16, also sets to "1" only when sending the first byte of user data, and to "0" otherwise. Such a sector boundary signal is sent to the subcode adding circuit 16.

On the other hand, the sub-code encoder 11 uses the sector number and the time code, the sector number and the entry point information, the sector number and the picture header information, the sector number and the temporary reference, or the sector number in the transmitted data. And the copyright management information to form a subcode, which is sent to the CRC encoder 12. CR
The C encoder 12 calculates the CRC of the subcode data sent from the subcode encoder 11, adds the CRC immediately after the subcode data, and sends the result to the synchronization pattern adding circuit 13.

The synchronization pattern adding circuit 13 adds a synchronization pattern immediately before the sub-code data to which the CRC has been added and sends the sub-code data to the sub-code buffer 14. The sub-code buffer 14 holds the transmitted synchronization pattern, sub-code data and data having a continuous CRC, and sends the data to the sub-code adding circuit 16 in response to a request from the sub-code adding circuit 16.

The sub-code adding circuit 16 requests the sub-code buffer 14 for data in which the corresponding synchronization pattern, sub-code data and CRC are continuous, using the sector boundary signal sent from the ECC encoder 15 as a clue. Is inserted immediately before the user data and ECC continuous data sent from the ECC encoder 15 and sent to the modulation circuit 17. The modulation circuit 17 modulates the data sent from the subcode addition circuit 16 and sends it to the writing device 18. The writing device 18 records the transmitted data on the data recording medium 19.

According to the above configuration, video data, audio data, caption data or any combination thereof is added to each sector in parallel with the process of recording the data at a variable rate in sector units. Additional information such as time code, entry point information, picture header information, temporary reference information, or copyright management information is generated and added as a subcode to be used. Can be realized.

Next, an apparatus for reproducing the data recording medium 19 on which the caption data is recorded as described above will be described with reference to FIG. The data reproducing apparatus shown in FIG. 8 is an application of the multiplexed data separating apparatus of the present invention.

In the data reproducing apparatus 100 shown in FIG. 8, data recorded on the data recording medium 19 is reproduced by a pickup 112. The pickup 112 irradiates the data recording medium 19 with laser light and reproduces data recorded on the data recording medium 19 from the reflected light. The signal reproduced by the pickup 112 is sent to the demodulation circuit 113. The demodulation circuit 113 demodulates the reproduction signal output by the pickup 112 and outputs the demodulated signal to the sector detection circuit 114.

The sector detection circuit 114 calculates the sector address SA recorded for each sector from the supplied data.
d, and supplies the sector address SAd to the ring buffer control circuit 116. The sector detection circuit 114 also outputs data to the subsequent ECC circuit 115 in a state where the sector is synchronized. Further, the sector detection circuit 114
If the address cannot be detected, or if the detected address is not continuous, for example, a sector number abnormality signal is output to the track jump determination circuit 128 via the ring buffer control circuit 116.

The ECC circuit 115 includes the sector detection circuit 11
An error of the data supplied from the data buffer 4 is detected, an error is corrected using the redundant bit added to the data, and a ring buffer memory (FIFO) 11 for track jump is used.
7 is output. Further, when the data error cannot be corrected, the ECC circuit 115 outputs an error occurrence signal to the track jump determination circuit 128.

The ring buffer control circuit 116 controls writing and reading of the ring buffer memory 117, and monitors a code request signal for requesting data output from the multiplexed data separation circuit 118.

The track jump determination circuit 128 monitors the output of the ring buffer control circuit 116, outputs a track jump signal to the tracking servo circuit 127 when a track jump is necessary, and causes the reproduction position of the pickup 112 with respect to the disk 19 to track jump. It has become. Further, the track jump determination circuit 128 detects a sector number abnormal signal from the sector detection circuit 114 or an error occurrence signal from the ECC circuit 115, outputs a track jump signal to the tracking servo circuit 127, and determines the reproduction position of the pickup 112 as a track. It is designed to jump.

The data output from the ring buffer memory 117 is supplied to a multiplexed data separation circuit 118. The header separation circuit 119 of the multiplexed data separation circuit 118
Separates the packet header from the data supplied from the ring buffer memory 117 and
1 and time-division multiplexed data to an input terminal G of the switching circuit 120.

Output terminals (switched terminals) H0, H1 and H2 of the switching circuit 120 are connected to input terminals of a caption code buffer 129, a video code buffer 123 and an audio code buffer 125, respectively. Further, the output of the caption code buffer 129 is connected to the input of the caption decoder 130, the output of the video code buffer 123 is connected to the input of the video decoder 124, and the output of the audio code buffer 125 is connected to the input of the audio decoder 126.

The code request signal generated by the video decoder 124 is input to the video code buffer 123, and the code request signal generated by the video code buffer 123 is input to the multiplexed data separation circuit 118. Here, the video data decoded by the video decoder 124 is based on the above-described MPEG-2 standard, and an image obtained by three different encoding methods of an I picture, a P picture, and a B picture is divided into a predetermined group (G
It is formed based on OP (Group of Picture).

Similarly, the code request signal generated by the audio decoder 126 is transmitted to the audio code buffer 1
25, the code request signal generated by the audio code buffer 125 is transmitted to the multiplexed data separation circuit 1
18 has been entered. The audio data decoded by the audio decoder 126 is also based on the MPEG-2 standard or uncompressed digital audio data.

The video data is converted into an NTSC standard analog TV signal by the NTSC encoder 134. At this time, the NTSC encoder 134 superimposes the caption data supplied from the caption decoder 130 on the vertical blanking section at the position specified on the bit stream (the horizontal scanning line number in FIG. 2, FIG. 4, or FIG. 5).

The time stamp control circuit 135 receives the input of the time stamp DTS separated from the packet header by the separation circuit control circuit 121, and receives each of the decoders 124, 1
26 and 130 are controlled.

Next, the operation of the data reproducing apparatus 100 will be described. The pickup 112 is the data recording medium 1
9 is irradiated with a laser beam, and the data recorded on the data recording medium 19 is reproduced from the reflected light. The reproduction signal output from the pickup 112 is input to the demodulation circuit 113 and demodulated. The data demodulated by the demodulation circuit 113 is sent to the ECC circuit 115 via the sector detection circuit 114.
, And errors are detected and corrected. When the sector number (address assigned to the sector of the data recording medium 19) is not normally detected by the sector detection circuit 114, the track jump determination circuit 12
8 outputs a sector number abnormal signal. ECC circuit 1
Reference numeral 15 outputs an error occurrence signal to the track jump determination circuit 128 when uncorrectable data occurs. The corrected data is supplied from the ECC circuit 115 to the ring buffer memory 117 and stored therein.

The output (sector address SAd) of the sector detection circuit 114 is supplied to a ring buffer control circuit 116. The ring buffer control circuit 116 specifies a write address (write pointer (WP)) on the ring buffer memory 117 corresponding to the sector address SAd.

Further, the ring buffer control circuit 116
Based on the code request signal from the subsequent multiplexed data separation circuit 118, the read address (read pointer (R) of the data written in the ring buffer memory 117 is read.
P)), data is read from the read pointer (RP), and the read data is supplied to the multiplexed data separation circuit 118.

The header separation circuit 119 of the multiplexed data separation circuit 118 separates the pack header from the data supplied from the ring buffer memory 117 and supplies the data to the separation circuit control circuit 121. The separation circuit control circuit 121 sequentially connects the input terminal G and the output terminals (switched terminals) H0, H1, and H2 of the switching circuit 120 according to the stream id information of the packet header supplied from the header separation circuit 119, The time-division multiplexed data is correctly separated and supplied to the corresponding code buffer.

The video code buffer 123 changes the multiplexed data separation circuit 118 according to the remaining amount of the internal code buffer.
Generate a code request for. Then, the data received in response to this request is stored. Further, it receives a code request from the video decoder 124 and outputs internal data. Video decoder 124
Decodes the supplied video data to reproduce a video signal, and outputs the video signal from an output terminal 131.

The audio code buffer 125 determines whether the multiplexed data separation circuit 1
A code request is issued to 18. Then, the data received in response to this request is stored.
Further, it receives a code request from the audio decoder 126 and outputs internal data. The audio decoder 126 decodes (decodes) the supplied video data to reproduce an audio signal, and outputs the audio signal from an output terminal 132.

As described above, the video decoder 124 requests data from the video code buffer 123, the video code buffer 123 requests data from the multiplexed data separation circuit 118, and the multiplexed data separation circuit 118 sets the ring buffer control circuit 116. Request data from Then, the data is read from the ring buffer memory 117,
It flows in the opposite direction to the request.

When reading from the ring buffer memory 117 is small, the ring buffer memory 117
May have an increased storage data amount and may overflow. The track jump determination circuit 128 monitors the write pointer (WP) and the read pointer (RP), and outputs a track jump command to the tracking servo circuit 127 when there is a possibility that the ring buffer memory 117 will overflow.

The track jump determination circuit 128
Outputs a track jump command to the tracking servo circuit 127 in order to reproduce the error occurrence position by the pickup 112 again when the sector number abnormality signal from the sector detection circuit 114 or the error occurrence signal from the ECC circuit 115 is detected.

When a track jump command is output from the track jump determination circuit 128, the tracking servo circuit 127 causes the reproduction position of the pickup 112 to jump to a predetermined position. In the meantime, the data already stored in the ring buffer memory 117 is transferred to the multiplexed data separation circuit 118 so that the data is not interrupted.

The above video data is transmitted to the NTSC encoder 1
The signal is converted into a video signal of the NTSC system by. Here, the caption data is located at 21H in the closed caption system in the United States, and 21H and 28H in EDS.
4H so that the NTSC encoder 134
It is superimposed on the video signal of the TSC system. Although not shown, when the pattern data is a mosaic pattern as in a captain system, the pattern is read from a ROM in which a pattern corresponding to the caption data is written in advance.

The video data, audio data and caption data encoded by the variable rate method have different data amounts per unit time. Therefore, the time stamp control circuit 135 outputs the control signals CV, CA, and CC to each decoder based on the DTS added to the PES packet, and performs synchronous control of the respective decoding timings.

In the above embodiment, the video data and the audio data are encoded by the MPEG-2 system. However, the video data is encoded by the MPEG-1 vi.
The audio data is encoded in accordance with the rules of the MPEG-1 audio or MD (Mini Disc (trademark)) ATRAC (Adaptive Tra).
nsform Acoustic Coding (trademark) or AC-3 (trademark of Dolby Corporation, USA).
Multiplexing may be performed according to the definition of 1 system.

As the data recording medium 19 described above, a recordable disk such as a magnetic disk, an optical disk, a magneto-optical disk, and a phase change disk can be used. The sector synchronization signal, the sector address, and the like may be recorded at the time of initialization, but may be pre-formatted. At the time of recording, data is recorded at a predetermined position using these pieces of information.

[0101]

According to the recording apparatus and recording method of the present invention, it is possible to multiplex caption data inserted at a position on an arbitrary horizontal scanning line with moving image data.

According to the recording medium of the present invention, it is possible to multiplex and record caption data inserted on an arbitrary horizontal scanning line together with moving image data.

According to the reproducing apparatus and the reproducing method of the present invention, it is possible to reliably decode and display moving image data and caption data.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an effective line according to the present invention.

FIG. 2 is a diagram showing a format of a PES packet for recording pattern data according to the present invention.

FIG. 3 is a diagram illustrating a stream ID.

FIG. 4 is a diagram showing another format for recording pattern data according to the present invention.

FIG. 5 is a diagram showing still another format for recording pattern data according to the present invention.

FIG. 6 is a block diagram showing a configuration example of a data recording device to which the data multiplexing device of the present invention is applied.

FIG. 7 is a flowchart illustrating processing of the multiplexing circuit 8 of FIG. 6;

FIG. 8 is a block diagram showing a configuration example of a data reproducing apparatus to which the multiplexed data separating apparatus of the present invention is applied.

FIG. 9 is a diagram illustrating an effective area.

FIG. 10 is a diagram illustrating a conventional effective line.

FIG. 11 is a diagram showing a recording format on a magnetic tape in a conventional video tape recorder.

[Explanation of symbols]

1 data recording device, 2 master data sending device,
4 header generation circuit, 5 video encoder, 6 audio encoder, 7 caption encoder,
8 multiplexing circuit, 9 time code information generator,
10 time code information switching circuit, 11 subcode encoder, 12 CRC encoder, 13
Synchronization pattern addition circuit, 14 subcode buffers,
15 ECC encoder, 16 subcode addition circuit, 17 modulation circuit, 18 writing device, 19
Data recording medium, 100 data reproducing device, 112
Pickup, 113 demodulation circuit, 114 sector detection circuit, 115 ECC circuit, 116 ring buffer control circuit, 117 ring buffer memory,
118 multiplexed data separation circuit, 119 header separation circuit, 120 switching circuit, 121 separation circuit control circuit, 123 video code buffer, 12
4 video decoder, 125 audio code buffer, 126 audio decoder, 127 tracking servo circuit, 128 track jump determination circuit, 129 caption code buffer, 130
Caption decoder, 134 NTSC encoder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) H04N 5/781 H04N 5/781 510L 5/92 F term (reference) 5C053 FA23 GA11 GB06 GB37 JA07 JA16 JA24 5D044 AB07 BC01 BC04 CC04 CC06 DE03 DE28 DE49 DE73 EF05 FG18 GK08 GK12 5D077 AA30 CA02 DC04 DC08 DC14 DD02 HC17

Claims (13)

[Claims] 1. A recording apparatus for recording a data stream on a recording medium, comprising: encoding means for encoding moving image data to be input; and generating means for generating caption data to be superimposed during a predetermined blanking period during reproduction. A multiplexing unit that generates a data stream including the encoded moving image data and the caption data; and a recording unit that records the data stream on the recording medium. 2. The recording apparatus according to claim 1, wherein the caption data is character data arranged on a 21st horizontal scanning line in an odd field in the case of the NTSC system. 3. The moving image data according to the NTSC system,
3. The printing apparatus according to claim 2, wherein in the odd field, data of a predetermined number of horizontal scanning lines after the 22nd is used. 4. The recording apparatus according to claim 1, wherein the caption data is character data arranged on a 284th horizontal scanning line in an even field in the case of the NTSC system. 5. The moving image data according to the NTSC system,
5. The recording apparatus according to claim 4, wherein in the even field, data of a predetermined number of horizontal scanning lines after the 285th field is used. 6. A recording method for a recording apparatus for recording a data stream on a recording medium, comprising: encoding input moving image data; generating caption data to be superimposed during a predetermined blanking period during reproduction; And generating a data stream in which the selected moving image data and the caption data are multiplexed, and recording the data stream on the recording medium. 7. In a recording medium on which a data stream is recorded, a data stream including encoded moving image data and caption data superimposed on blanking during reproduction is recorded in a data recording area. Recording medium characterized by the following. 8. A reproducing apparatus for reproducing a data stream recorded on a recording medium, comprising: reproducing means for reproducing the data stream from the recording medium; moving image data encoded from the reproduced data stream; A separating unit that separates data; a decoding unit that decodes the separated encoded moving image data; a generating unit that generates a video signal having blanking according to the decoded moving image data; A reproducing device, comprising: superimposing means for superimposing the separated caption data during a predetermined blanking period of the signal. 9. The reproducing apparatus according to claim 8, wherein the caption data is character data arranged on a 21st horizontal scanning line in an odd field in the case of the NTSC system. 10. The reproduction method according to claim 9, wherein, in the case of the NTSC system, the moving image data is data of a predetermined number of horizontal scanning lines after the 22nd in an odd field. apparatus. 11. The reproducing apparatus according to claim 8, wherein the caption data is character data arranged on a 284th horizontal scanning line in an even field in the case of the NTSC system. 12. The reproduction method according to claim 11, wherein in the case of the NTSC system, the moving image data is data of a predetermined number of horizontal scanning lines after the 285th in an even field. apparatus. 13. A reproducing method of a reproducing apparatus for reproducing a data stream recorded on a recording medium, comprising: reproducing a data stream from the recording medium; moving picture data encoded from the reproduced data stream; Separating the data, decoding the separated coded moving image data, generating a video signal having blanking according to the decoded moving image data, a predetermined blanking period of the video signal And reproducing the separated caption data on the reproduction method.