JP2003242755A - Data recorder, data recording and reproducing device, data recording method and data recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate various kinds of location information or the like when recording digitally transmitted data on a disk to easily realize high-speed seeking and special reproduction by utilizing the information at reproduction. <P>SOLUTION: Desired encoded data dn are demultiplexed and extracted from a received stream D1 in a demultiplexer circuit 3 and image output is obtained through a decoding circuit 4. Also, the data dn are recorded on the disk 13 and a recording data generation circuit 18 generates in a RAM 19 the table data of the location information or the like corresponding to a sector address from information from the decoding circuit 4 and records the contents of the RAM 19 in a specified area on the disk 13 at the point of time of ending the recording of the data dn on the disk 13. At reproduction, they are utilized and the high-speed seeking and the special reproduction are easily realized. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records digital data, which is data-compressed by an encoding means and is distributed by broadcasting or communication, on a disc, and reproduces and outputs the read data by using a decoding means. Like to get
The present invention relates to a disc recording device and a recording / reproducing device.

[0002]

2. Description of the Related Art As a package medium using a disc, a compact disc for audio (hereinafter referred to as
CD) and a CD-ROM (Read Only Mem) in which digital data such as computer data other than audio is also recorded on the same optical disc as the CD.
ory), etc., and these reproduction-only devices have been widely commercialized.

For example, digital data on a CD-ROM has recording tracks and is spirally recorded on a disc. The data recording format constitutes a minimum unit called a frame as shown in FIG. 2A, and includes synchronization data, subcode including position information (address) and time information, digital data of main information, and error correction code. Etc. Further, as shown in FIG. 2B, the recorded data on the disc is equivalent to 98 frames (235
It is continuous by taking a sector structure in which the digital data of 2 bytes) is used as one sector, and the subcode completes its contents in units of one sector as information.

In addition, the TOC (Tab
There is an area called "le Of Contents" in which menu information related to the recording data of the disc is recorded. Normally, high-speed seek to a designated position is
This is performed by referring to the OC and comparing it with the time information in the subcode at the current reproduction position.

By the way, at present, a disc compatible with the recording format of the CD-ROM and the like and capable of recording digital data (hereinafter referred to as a recordable disc) has been commercialized, and is mainly used for business. It is being appreciated. In such a recordable disc, for example, a recordable CD-WO (Write Once) or a recordable / erasable CD-MO (Magneto O) can be used.
ptics) and the like, and their applications are expanding.

Further, in recent years, as digital data to be recorded on the disc, not only computer data but also compressed data obtained by highly efficient encoding of moving image data and audio data is handled, and this is recorded and reproduced on the disc. Demand for a disk recording device and a recording / reproducing device as devices is increasing.

As such, for example, a video CD has already been commercialized as a reproduction-only disc and a reproduction device, and moving image data and accompanying audio data are recorded using an optical disc of the same size as an audio CD. It is possible to play for 74 minutes.

In this video CD, the M (ISO) standard is used as the recording data encoding system and multiplexing system.
PEG1 (Moving Picture coding Experts Group phas
The method called e1) is adopted, and each data is divided into a data string of appropriate length called a packet (hereinafter called stream), multiplexed with a header containing additional information and recorded on the disc. ing.

Further, in this system, for example, moving image data is recorded on the disc in the arrangement shown in FIG. An I picture is an intra-coded picture whose encoding is completed only within the screen (picture), a P picture is a forward predictive picture in which prediction from an earlier I or P picture is performed, and a B picture is before and after that. It is a bidirectional prediction picture in which prediction from I and / or P pictures is performed.
As can be seen from this configuration, since the P picture and the B picture are dependent on other pictures for encoding, the decoding cannot be completed only by the data of the picture. Therefore, in order to perform special reproduction such as reproduction from the middle of the stream or high-speed reproduction, additional information indicating a mode (I / P / B) of the picture, which is usually called a picture header, is sequentially searched to find the I picture. After finding it, the data is reproduced and output in an appropriate form.

The above-mentioned MPEG1 system is limited to package media, and the data transmission rate is about 1.5.
It is considered to be up to Mbps [bits per second], and the quality of the reproduced image is VH of the analog VTR.
It is said to be about the S method. Therefore, for example, in order to record a plurality of data sent by broadcasting or communication media on a recordable disc and obtain the reproduction output without deteriorating the quality, the data transmission rate is increased and the code with higher efficiency is used. It is necessary to use a coding method and a multiplexing method, and as a representative example of a method corresponding to this, the MPEG2 (MPEG phase 2) method, which is an extension of the MPEG1 method, is currently the mainstream.

[0011]

According to the above-mentioned conventional example, for example, multiplexed moving image data and audio data after high-efficiency coding are distributed by broadcasting or communication, and are received and recorded on a recordable disc. In this case, it is conceivable that the request for the recording operation occurs several times, and a plurality of dispersed contents as data are recorded on one disc. When reproducing specific recorded data from such a disc, special reproduction such as high-speed seek and high-speed reproduction is an essential function.
It is effective to reserve menu information corresponding to C and various position information in a specific area.

Therefore, an object of the present invention is to obtain menu information and various position information when recording coded data distributed by broadcasting or communication on a disc,
It is an object of the present invention to provide a disc recording device and a disc recording / reproducing device capable of realizing a special reproducing function such as high-speed seek or high-speed reproducing by utilizing the above information when reproducing recorded data.

[0013]

In order to achieve the above object, according to the present invention, a memory is provided in a disc recording device or a disc recording / reproducing device to record received data on a disc and at the same time, for example, in-plane encoded data. Various kinds of position information, such as address information of the sector including the, are stored in the memory as a table. Further, when the recording of the received data on the disc is finished, the contents stored in the memory are recorded in a specific directory area or the like on the disc.

Since a table of address information of data recorded on the disc is constructed in a specific directory area on the disc, by referring to this table, special tables such as high-speed seek and high-speed reproduction can be obtained. Playback can be easily realized.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which specific data is extracted from a plurality of received encoded data, recorded on a recordable disc, and further the data recorded from the disc is recorded. 1 shows a disk recording device and a recording / reproducing device configured to reproduce. In this embodiment, for simplicity, a case will be described in which only encoded data of moving image data is multiplexed and broadcast.

In FIG. 1, the flow of data from the received data to obtaining an image output will first be described together with the contents of each component. Video data is code-compressed at a broadcasting station, and a plurality of coded data are multiplexed as a continuous stream by a predetermined method and digitally transmitted. Reference numeral 1 is an antenna for receiving digitally transmitted data, 2 is an RF demodulation circuit, 3 is a demultiplexer for separating and extracting desired encoded data dn from the RF demodulated stream D1.
A multiplexer circuit 4, a decoding circuit for performing a decoding process corresponding to the coding process applied to the coded data dn and outputting moving image data, 5 is a frame memory attached to the decoding circuit 4, and 6 is a digital memory. Digital / analog (hereafter,
D / A) conversion circuit, and 7 is an output terminal.

Here, the data format of the stream D1 will be briefly described with reference to FIG. FIG. 4 shows the above-mentioned MP as an encoding method and a multiplexing method of moving image data.
It shows the data format of a stream transmitted when the EG2 method is used. In order to multiplex multiple encoded data, the data has a form called a transport stream, and one for time division multiplexing.
A transport packet fixed at 88 bytes is used as a transmission unit. For example, when a transport stream D1 as shown in FIG. 4A is transmitted, the demultiplexer circuit 3 separates and extracts a series of encoded data dn as shown in FIG. 4B. In FIG. 4A, a packet without a symbol is a portion in which other coded data is multiplexed. Note that each packet actually includes additional information such as a packet header, but the description thereof is omitted here because it is not particularly necessary here. Further, in this case, the decoding circuit 4 also corresponds to the MPEG2 system.

Due to the above-described data flow, it is possible to extract specific encoded data from the received stream and obtain an image output without particularly recording on the disc. This is equivalent to selecting and viewing a program of a desired channel from the TV programs of a plurality of channels transmitted by.

Next, the operation at the time of recording will be described together with the contents of the components. It should be noted that although some of the constituent elements are also used in the operation at the time of reproduction, only the operation performed at the time of recording will be described here. 8 is a scramble circuit for performing scrambling processing for averaging the power spectrum of the data to be recorded on the disk 13 with respect to the encoded data dn, 9 is a switch for switching between recording and reproduction, and 10 is a scrambled For data, a digital signal processing circuit for performing digital signal processing according to the recording format of the disk 13 such as addition of error correction code, interleaving, and modulation, 11 is a recording / preamplifier, and 12 is a signal amplified by the recording / preamplifier 11 13 is a recordable disc, 13 is a recordable disc, 14 is a servo circuit for controlling the movement of the pickup 12, and 15 is a disc 13
Is a motor for rotating the motor, 16 is a motor servo circuit for controlling the motor 15 to rotate at a constant linear velocity, and 17 is a microcomputer for performing system control.

Although the encoded data dn is recorded on the disk 13 with the above configuration, the components to be noted in this embodiment are the recording data generating circuit 18 and the RAM 19.
Is. For example, assuming that a sector address is added to each data in sector units generated in the digital signal processing circuit 10 as shown in FIG. 5, the recording data generation circuit 18 includes an I picture from the decoding circuit 4. The position information in the encoded data d1 to be received is received, and table data called the position of the I picture corresponding to the sector address as shown in FIG. 6 is generated. These table data are sequentially stored in the RAM 19, and when the recording of the encoded data d1 onto the disk 13 is completed, the stored table data is recorded / preamplified 11
Through the disk 13 in the TOC area or a specific directory area.

Therefore, the operation during reproduction will be described next. The signal read from the disk 13 by the pickup 12 is amplified by the recording / preamplifier 11, and the digital signal processing circuit 10 performs error correction, de-interleaving, demodulation, and other processing that is the reverse of that at the time of recording. Through the descramble circuit 20
Passed to. In the descramble circuit 20, the scramble process is released and the encoded data dn is obtained. Therefore, by passing this to the decoding circuit 4, the same process as in the case of obtaining the image output described above is performed from the output terminal 7. It becomes possible to obtain a reproduction output.

When the data recorded on the disk 13 is sequentially reproduced from the beginning at the normal speed, the moving image data is reproduced only by the above configuration, but when the special reproduction such as the high speed reproduction is performed. The table data recorded in the TOC or a specific directory area is used.

For example, when the table data is as shown in FIG. 6, the microcomputer 17 can easily realize high speed reproduction by sequentially reproducing and outputting I pictures based on this information. Further, the microcomputer 17 arbitrarily determines the address of the I picture to be reproduced next, and seeks the address on the disk 13,
High-speed reproduction at an arbitrary speed can be realized. In this case, since the address of the I picture to be reproduced next is not limited to the later one, the high speed reproduction in the reverse direction and the random still image reproduction can be easily realized.

Further, when the information recorded as the table data is the contents of the recording data corresponding to each sector address as shown in FIG. 7, high speed seek to desired data can be performed by utilizing this. It can be easily realized.

As described above, according to this embodiment, when the received encoded data is recorded on the disk, the position information corresponding to the sector address and the like is stored as table data in the RAM.
By generating the above and recording the encoded data on the disc, the contents of the RAM are recorded in a specific area on the disc, and this information is used to perform high-speed seek and high-speed reproduction. Special playback of can be easily realized.

In the present embodiment, the case where the position information of the I picture and the content information of the recording data are generated as the table data on the RAM has been described. The contents of the table data are not limited to the above. In the present embodiment, the case has been described in which the encoded data dn is separated and extracted from the received transport stream D1 and recorded on the disc.
If the capacity of the disc is sufficient, the transport stream D1 is recorded on the disc as it is, and detailed information on the recorded contents is stored as table data in R.
There is no particular problem even if it is constructed on the AM and recorded in a specific directory area on the disc. Further, in the present embodiment, the case where only moving image data is transmitted has been described, but there is no problem even when audio is multiplexed, and the encoding method and the multiplexing method are MPEG2.
The method is not limited. Furthermore, in the present embodiment, the case where the scrambling circuit and the descrambling circuit are provided before the switch for recording and after the switch for reproducing has been described. Depending on the method or the like, a configuration that does not require both circuits may be possible.

[0028]

As described above, according to the present invention, a memory is provided in the apparatus, the received encoded data is recorded on the disk, and table data such as position information is generated on the memory, and this data is stored. Finally, by recording in a specific area on the disc, by referring to this table data during reproduction, special reproduction such as high-speed seek or high-speed reproduction can be easily realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a disk recording device and a recording / reproducing device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a frame structure and a sector structure of a data format recorded on a CD-ROM.

FIG. 3 is a diagram for explaining a structure of moving image data in the MPEG system.

FIG. 4 is a diagram showing a structure of a stream to be received and encoded data separated and extracted from the stream.

FIG. 5 is a diagram showing an address position for each sector.

FIG. 6 is a diagram showing an example of table data recorded in a specific area on a disc.

FIG. 7 is a diagram showing another example of table data recorded in a specific area on a disc.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... RF demodulation circuit, 3 ... Demultiplexer circuit, 4 ... Decoding circuit, 9 ... Switch, 10 ... Digital signal processing circuit, 11 ... Recording / preamplifier, 12 ...
Pickup, 13 ... Disc, 17 ... Microcomputer, 18
Recording data generating circuit, 19 RAM

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 12, 2003 (2003.2.1
2)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Data recording device , data recording / reproducing device , data recording method and data recording / reproducing method

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION The present invention provides a coded de <br/> Ijitarudeta recorded on the disk, the read and decoded so as to obtain a reproduced output to the data, the data SL <br /> Recording technology and data recording / reproducing technology .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012] It is an object of the present invention, special playback functions of the high-speed seek and high-speed reproduction or the like is feasible is to provide a data recording technique及<br/> beauty data recording and reproducing technology.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

In one aspect of the present invention in order to achieve the above object, according to an aspect of the digital data encoded
Encoded digital data recorded on a disc
To extract specific data from the
Content information indicating the content of the specific data based on the data
And in the encoded digital data,
Generate position information indicating the recording position of specific data, and
The content information and the position information are recorded on the disc.
To configure.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

[0028]

EFFECT OF THE INVENTION Digital data and contents as in the present invention
By recording information and position information , special reproduction such as high-speed seek and high-speed reproduction can be easily realized.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/92 H04N 5/92 H 5D110 7/24 7/13 Z (72) Inventor Toshifumi Takeuchi Yokohama, Kanagawa Hitachi, Ltd. Multimedia System Development Headquarters, 292 Yoshida-cho, Totsuka-ku, Japan (72) Inventor Masafumi Nakamura 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Pref., Hitachi, Ltd. Multimedia System Development Headquarters (72) invention Yu Nagai 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock company Hitachi multimedia system development headquarters (72) Inventor Masayuki Hirabayashi 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. multimedia system development F term in headquarters (reference) 5C052 AA02 AB04 AB05 AC05 BB03 CC11 5C053 FA20 FA23 GA20 GB06 GB08 GB38 HA24 LA07 5C059 MA00 PP04 PP05 SS13 SS16 SS17 SS19 UA02 UA05 UA38 5D044 AB05 BC04 CC04 DE03 DE38 DE49 DE53 EF03 EF05 5D077 AA29 AA30 BA04 BA26 CA02 DC08 EA33 5D110 A12 DA03 A17 DA03 A17 DAA A17 AA16 DAA17

Claims (2)

[Claims] 1. Corresponding to a recording means for receiving digital data generated by a specific encoding means and sequentially recording it on a disc, and an encoding means capable of decoding and outputting the digital data. In a disk recording device having a decoding means, a memory is provided in the disk recording device, and when the recording means records the digital data on the disk, the contents of the digital data recorded by the decoding means And the position information on the disc on which the data is recorded are extracted, the contents of the digital data and the position information are stored in the memory, and the recording of the digital data on the disc is completed. At this point, both of the information recorded in the memory are configured to be recorded in a specific area on the disc. Disk recording apparatus characterized. 2. Corresponding to a recording means for receiving digital data generated by a specific encoding means and sequentially recording it on a disk, and an encoding means capable of decoding and outputting the digital data. A disk recording / reproducing apparatus having a decoding means and a reproducing means for reproducing digital data recorded on the disk, wherein a memory is provided in the disk recording / reproducing apparatus, and the recording means records the digital data on the disk. In doing so, the contents of the recorded digital data and the position information on the disc on which the data is recorded are extracted from the decoding means, and the contents of the digital data and the position information are stored in the memory. When the recording of the digital data on the disc is completed, the digital data is stored in the memory. Both of the recorded information are configured to be recorded in a specific area on the disc, and when the reproduction output of the digital data recorded on the disc is obtained by the reproduction means and the decoding means. The disk recording / reproducing apparatus is characterized in that reproduction from a desired position or special reproduction is performed according to the information recorded in a specific area on the disk.