JP2002158967A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk recording and reproducing device capable of reducing the load on a control unit, and seamlessly executing reproduction even when streams whose temporal continuity at the time of recording is not maintained are stored in different areas. SOLUTION: A plurality of sequencers 114, 116, and 118 respectively issue an access request, read encoded data from the arbitrary address of a first storage means 108, and transfer the encoded data through second storage means 113, 115, and 117 to a decoding part. Even when streams whose temporal continuity at the time of recording is not maintained are stored in different areas in the first storage means 108, the respective sequencers issue the access request by executing address control so that the inter-frame continuity can be maintained. Thus, it is possible to reduce the load of a control unit, and to seamlessly execute reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording and reproducing moving image data and audio data encoded using a high-efficiency moving image encoding technique utilizing inter-frame relationships on a disk medium. Related to the device.

[0002]

2. Description of the Related Art In recent years, in addition to a magnetic tape recording and reproducing apparatus for recording and reproducing encoded moving image data and audio data on a magnetic recording tape medium, a disk recording and reproducing for recording and reproducing on a disk medium such as a hard disk. The device is becoming popular. Disc recording / reproducing devices have already been commercialized or are being commercialized by various companies. One of the advantages of the disk recording / reproducing device over the magnetic tape recording / reproducing device is the so-called data access speed when searching and reproducing target data. In other words, in the case of a magnetic tape recording / reproducing apparatus, it generally takes a long time to move the magnetic tape between searching for and reproducing target data, whereas in the case of a disk medium, it takes time on a rotating disk medium. Since the head only needs to move about several cm, it does not take much time.

As one of the high-efficiency moving picture coding techniques used for the disc recording format of disc recording and reproducing apparatuses which are currently being commercialized, MPEG (Moving P
icture Experts Group).

[0004] With regard to the moving picture coding by MPEG2, only a frame structure in which a frame is a unit of coding will be described. An I picture, a B picture, and a P picture exist in a frame structure in which a frame is a unit of encoding. An I picture is a screen encoded from information of only one frame, and is generated without using inter-frame prediction. A P picture is a screen formed by performing prediction from an I or P picture. B picture is MPE
This is a screen formed by bidirectional prediction, which is a feature of G.

FIG. 7 shows an example of a GOP where M = 2 and N = 10. Here, the GOP means “Group Of Picture”, which is a group of images having at least one I picture. “M” is a cycle in which an I picture or a P picture appears, and “N” is the number of pictures in a GOP. I1 is an I picture, B2, B3, B5, B6, B8
And B9 indicate B pictures. P4, P7 and P10 indicate P pictures. Now, it is assumed that a picture having a GOP structure as shown in FIG. 7 is displayed. Since the I picture I1 is a screen encoded from only one piece of frame information, it can be displayed by decoding moving picture encoded data of this picture. Next, when the B picture B2 is displayed, since the B picture is a screen formed by bidirectional prediction as described above, the decoded data of the I picture I1 decoded earlier is necessary, and The moving picture coded data of the picture P4 must be decoded in advance. Also, in decoding the next B picture B3, decoded data of the I picture I1 and decoded data of the P picture P4 are required. Considering these facts, the order of recording the encoded moving image data on the disk medium is preferably as shown in FIG.

[0008] Next, the reason why the recording order as shown in FIG. 8 is preferable will be described with reference to the procedure for decoding moving picture encoded data shown in FIG. 901 and 902 in FIG. 9 are storage means,
The storage units 901 and 902 store the decoded moving image encoded data (for one frame), respectively. 903 is a decoder. Now, the moving image encoded data is supplied to the decoder 903.
(Fig. 9-).

First, the moving picture coded data of the I picture I1 is decoded (FIG. 9-). Decoded I picture I1
Is stored in either storage means 901 or 902 (901 in the example shown), and the decoder 90 is displayed for display.
3 is output.

Next, the moving picture encoded data of the P picture P4 is decoded (FIG. 9-). Decoded P picture P4
Are stored in the storage unit 902. No output is made from the decoder 903 at this time.

Next, the moving picture coded data B of the B picture
2 is decrypted (FIG. 9-). When decoding the moving picture coded data B2 of the B picture, the decoded data of the I picture I1 previously stored in the storage means 901 and the storage means 902
Using the decoded data of the P picture P4 stored in the. The decoded B picture data B2 is
3 is output.

[0010] The encoded video data of the next B picture B3 is also output from the decoder 903 in a similar procedure using the decoded data of I1 and the decoded data of P4 (FIG. 9-). At this point, the decoded data of the I picture I1 stored in the storage unit 903 is deleted because it becomes unnecessary.

Next, the decoded data of the P picture P4 stored in the storage means 903 is output from the decoder 903 (FIG. 9-).

P picture P stored in storage means 902
Using the decoded data of No. 4, the moving picture coded data of the P picture P7 is decoded and stored in the storage unit 901. At this time, the decoded data of the P picture P7 is
03 is not output (FIG. 9-).

By decoding the encoded video data in the steps described above, the display order as shown in FIG. 7 is realized. The problems that occur here will be described with reference to FIG. Reference numeral 1001 denotes a flow of encoded video data (hereinafter, referred to as a stream together with the flow of encoded audio data and other data). FIG. 10 shows an operation of playing back a stream, skipping midway, that is, not starting playback, and starting playback from a new position. 1002 indicates a skip start point, and 1003 indicates a reproduction start point from a new position. If the reproduction start point 1003 is not moving picture encoded data of an I picture, a circuit configuration as shown in FIG.
In the decoding procedure, playback cannot be performed seamlessly, that is, while maintaining the continuity of pictures in display time.

As means for solving this, Japanese Patent Laid-Open No. 7-203358
The technology described in Japanese Unexamined Patent Publication (Kokai) No. H10-26095 is cited. FIG. 11 is a block diagram showing a configuration of a moving image reproducing apparatus described in Japanese Patent Application Laid-Open No. 7-203358. In FIG. 11, reference numeral 1101 denotes a first storage unit for storing moving image encoded data;
Is a second storage unit that stores index frame (details are described below) information, 1103 is a decoding and reproducing unit that decodes encoded video data, 1104 is a display device that displays the reproduced video, and 1105 is a display device that displays the reproduced video. This is a control unit that controls the entire moving image reproducing apparatus by a program. The first storage unit 1101 and the second storage unit 1102 are realized by, for example, an optical disk.

Next, the index frame information stored in the second storage means 1102 will be described. FIG. 12 is an explanatory diagram showing a data configuration of index frame information in the moving picture reproducing device shown in FIG. In order to reproduce an intermediate frame of moving image encoded data using inter-frame prediction, reference image data is required for a partial region of the frame or the entire frame. Therefore, the reference image data necessary for reproducing the intermediate frame of the encoded moving image data and the storage address of the encoded data of the intermediate frame in the first storage unit 1101 are stored as frame information in the second storage unit. It is stored in 1102. A group of frame information for a number of intermediate frames is index frame information. The frame information is set for some frames among all the frames constituting the moving image encoded data. And
The frame in which the frame information is set can be arbitrarily selected, and the arbitrarily selected frame can be randomly accessed. Therefore, an arbitrary frame can be randomly accessed as a result.

Next, the operation will be described. Information indicating a certain halfway frame is specified by the operator or the like by the control unit 1.
When input to 105, the control unit 1105 notifies the decoding / reproducing unit 1103 of the frame. Decryption / reproduction means 1
103 reads the frame information of the frame from the second storage unit 1102. Then, the decryption / reproduction means 110
Reference numeral 3 expands the reference image data in the frame information in the internal memory and reads the encoded data in the first storage unit 1101 indicated by the storage address in the frame information. The decoding and reproducing unit 1103 decodes the read encoded data with reference to the reference image data, and
To supply. Further, encoded data for the next frame is read from the first storage unit 1101, and the read encoded data is decoded and supplied to the display device 1104 with reference to the decoded frame. This operation is repeated, and the moving image after the selected frame is reproduced. In this way, random access can be performed for frames included in each frame information. The frame for which the frame information is created can be arbitrarily selected.

[0017]

However, in the technique described in the above publication, since all operations of the moving image reproducing apparatus are controlled by one control unit 1105, the control unit 1105 is overloaded. In addition, in the so-called post-recording in which audio data is recorded while reproducing moving image data only by managing the index frame information as described above, it is not possible to realize display of reproduced moving images and recording of audio while ensuring seamlessness. difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a stream which does not maintain temporal continuity at the time of recording while reducing the load on a control unit is stored in a first storage means. A disk recording / reproducing apparatus capable of seamlessly reproducing even when stored in separate areas within the same, and furthermore, realizing display of reproduced moving images and recording of audio in post recording while ensuring seamlessness. It is an object of the present invention to provide a disk recording / reproducing apparatus capable of performing the above.

[0019]

The present invention has the following configuration to achieve the above object. According to a first aspect of the present invention, there is provided a disk recording / reproducing apparatus for reproducing moving image encoded data and / or audio encoded data encoded using inter-frame prediction from a disk medium by a first control unit. First storage means for temporarily storing encoded data when reproducing data from a disk medium; second storage means including a plurality of storage units for temporarily storing encoded data read from the first storage means; A second control unit capable of controlling the address management in the first storage unit and the writing of a series of encoded data read from the first control unit to the storage unit independently of the first control unit; Wherein the encoded data is read from the first storage unit in response to an access request from the second control unit, and is transferred to the decoding unit via the second storage unit. Record In the raw device.

According to the first aspect of the present invention, the second control unit manages the address in the first storage unit independently of the first control unit, and reads a series of addresses read from the first control unit. By writing the encoded data into the storage unit, the load on the first control unit can be reduced, the processing speed of the first control unit can be increased, and the processing of the entire apparatus can be efficiently performed. Can be done.

According to a second aspect of the present invention, the first and second storage units of the second storage unit are connected to the decoding unit via a selector for performing time-division transfer. When reproducing the discontinuous first and second encoded data groups, the second control unit reads the first and second encoded data groups from the first storage means, and The first and second encoded data groups are temporarily stored in the first and second storage units for each data group, and the first and second encoded data groups are time-divisionally transferred to the decoding unit via the selector. And a disc recording / reproducing apparatus according to the gist of the present invention.

According to the second aspect of the present invention, a group of encoded data which does not maintain temporal continuity at the time of recording is stored in a separate area in the first storage means, and is reproduced continuously. Even if the second control unit performs the address management, the second control unit performs the address management, stores the encoded data groups in separate storage units, and transmits the encoded data groups to the decoding unit so that continuity between frames is maintained. ,
The second encoded data group can be reproduced seamlessly. This makes it possible to continuously reproduce encoded data groups that do not maintain temporal continuity during recording, while reducing the load on the first control unit.

According to a third aspect of the present invention, the second storage means has first and third storage sections, and the second control section includes:
An operation of transferring encoded video data for reproduction to a decoding unit using the first storage unit, and a first storage unit of encoded audio data for recording on a disk medium using the third storage unit The first aspect of the present invention resides in a disk recording / reproducing apparatus for performing a parallel processing of a transfer operation to a disk.

According to a third aspect of the present invention, the first, third
Using the storage unit, the reproduction process of the moving image encoded data and the recording process of the audio encoded data on the disk medium,
Parallel processing can be performed independently of the first control unit, and post-recording for recording audio in accordance with moving image encoded data to be reproduced can be efficiently performed.

According to a fourth aspect of the present invention, when the second control unit receives a data transfer instruction of a data amount larger than the capacity of the storage unit from the first control unit, the second control unit transmits the second control unit. The first method is characterized in that, while maintaining the continuity of the addresses in one storage means, the storage of the divided data in the one storage part and the transfer of the divided data stored in the storage part to the decoding part are repeated. To the third gist of the present invention.

According to the fourth aspect of the present invention, the processing load on the first control unit can be further reduced in addition to the above-mentioned effects.

According to a fifth aspect of the present invention, there is provided the disk recording / reproducing apparatus according to the first to third aspects, wherein a plurality of the second control sections are provided corresponding to the respective storage sections. .

According to the fifth aspect of the present invention, since the processing of each storage unit is shared by the second control unit which can perform independent processing, parallel processing using a plurality of storage units, Time-division processing can be performed efficiently while reducing the processing load on the first control unit.

According to a sixth aspect of the present invention, there is provided a control signal selector for arbitrating an access request to the first storage means output from the plurality of second control units, and via the control signal selector. A fifth aspect of the present invention resides in the disk recording / reproducing apparatus which outputs the access requests one by one.

According to the sixth aspect of the present invention, time-division access processing by the control signal selector can be easily performed, and in particular, parallel processing and division processing of a plurality of second control units can be easily performed.

According to a seventh aspect of the present invention, the control signal selector has a counter that counts only when an access request is issued from the plurality of second control units at the same time. When an access request to the first storage unit is simultaneously output from the unit, an access request from the corresponding one of the second control units is output according to the value of the counter, and the second When the access request from the control unit to the first storage unit is single, the access request of the second control unit that outputs the access request is output regardless of the value of the counter. A sixth aspect of the present invention is a disk recording / reproducing apparatus according to the sixth aspect.

According to the seventh aspect of the present invention, a plurality of access requests can be prioritized by the counter, and data can be transferred according to the priority with a simple configuration.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram illustrating the configuration of a disk recording / reproducing apparatus according to the present invention. A disk recording / reproducing apparatus reads out data from a disk medium at the time of reproduction and performs signal processing on the data, thereby reproducing images and sounds, displaying images on a display device, and outputting sounds from speakers through total signal processing. I do. At the time of recording, each circuit performs signal processing for recording.

Here, signal processing during reproduction will be described. In FIG. 1, reference numeral 101 denotes a control unit. Control unit 10
1 controls all the functional blocks constituting the disk recording / reproducing apparatus. Reference numeral 102 denotes a disk-shaped disk medium such as light or magneto-optical (hereinafter, abbreviated as “disk”).
It is. On the disc 102, management information, moving image encoded data, audio encoded data, and the like are recorded. 103
Denotes a pickup device which reads data from the disk 102 by light, for example. 104 is a modem.
The modulator / demodulator 104 demodulates data read from the disk 102, which is modulated for recording, and deletes added redundant data. 105 is E
This is a CC circuit that performs error code correction. Reference numeral 106 denotes a scramble / descramble circuit, which performs descrambling and also transmits to the control unit 101 a logical address or the like on the disk 102 on which the read data has been recorded. 108 is a storage means for temporarily storing data. 107 is a storage control unit. The storage control unit 107 arbitrates access requests to the first storage unit 108 from the modem 104, the ECC circuit 105, the scramble / descramble circuit 106, and the data transfer control unit 109 described later.

The data transfer control section 109 includes an internal circuit control section 110, a plurality of (in this example, first to third) sequencers 114, 116, and 118 which are independent of each other, and each of the sequencers 114, 116, and 118. It has second storage means 113, 115, 117 provided for each, a control signal selector 111, and selectors 112, 119.

The internal circuit control unit 110 controls all circuits in the data transfer control unit 109. The first to third sequencers (control units) 114, 116, 118
Each of the second storage means 113, 115, 117 is independently controlled, and based on the control from the control unit 101,
The storage unit 10 is stored in the storage unit control unit 107 independently.
8 is output.

The control signal selector 111 controls the first to third output signals from the first to third sequencers 114, 116 and 118.
Is selected according to the control from the control unit 101.

The selector 112 is connected to the data transfer control unit 10
9 is a selector for both input and output data. The selector 112 outputs the first signal output from the control signal selector 111.
The data output from the storage control unit 107 is transmitted to any one of the first to third sequencers 114, 116 or 118 based on the access request to the storage 108. The selector 119 is a selector for both input and output data of the data transfer control unit 109. This selector 119
Selects and outputs one of the data output from the first and second sequencers 114 and 116 according to a data output request signal from the ES generation unit 120 described later.

The ES generation unit 120 includes the data transfer control unit 1
Reference is made to the header information added to the data output from step 09 to identify moving image encoded data, audio encoded data, and other data.

Reference numeral 122 denotes a moving image encoding / decoding unit.
The moving image encoded data identified by the ES generation unit 120 is decoded. Reference numeral 121 denotes a storage unit which temporarily stores data decoded by the moving image encoding / decoding unit 122. A display device 123 displays a moving image demodulated by the moving image encoding / decoding unit 122. Reference numeral 125 denotes an audio encoding / decoding unit that decodes the encoded audio data identified by the ES generation unit 120. Reference numeral 124 denotes a storage unit that temporarily stores data demodulated by the audio encoding / decoding unit 125. Reference numeral 126 denotes a speaker that outputs the sound demodulated by the sound encoding / decoding unit 125. 1
Reference numeral 27 denotes a microphone, which converts sound into an electric signal and inputs the signal.

Next, a method for realizing reproduction from an arbitrary frame based on the above configuration will be described.
It should be noted that the moving picture encoded data recorded on the disc 102 is
Address information for enabling the pickup device 103 to access the head of P is recorded on the disk 102 as a part of the management information, and is read and used by the control unit 101 as needed ( This address information is referred to as a time information-GOP head address table (see FIG. 3). It is also assumed that the ES generation unit 120 and the video encoding / decoding unit 122 have the ability to process not only one stream but also two or more streams in parallel. Here, GOP in the stream
It is assumed that the configuration has an I picture at the head as shown in FIG. 7 and all pictures in the GOP can be decoded without using the picture data of the previous GOP.

As shown in FIG. 2, the operator reproduces the first few pictures (from I1 to Pa) and jumps to reproduce the next several pictures (from Bb to Pc). Suppose you edit The head of the stream of pictures for the first few minutes starts reproduction from the I picture (I1) of the GOP, and the head of the stream of pictures for the next few minutes after jumping is a B picture (Bb) in the middle of the GOP.
It is assumed that reproduction is started from. The last picture of the first few minutes of the picture and the last picture of the next few minutes of the jumped picture are the GOPs described above.
Assume that this is the last P picture in the configuration (Pa, P
c).

In this case, a temporally discontinuous point 201 occurs between Pa, which is the last picture of the first few minutes of the picture, and the first picture Bb of the next few minutes of the picture (FIG. 2). (A)). Therefore, when reading the stream necessary for display, assuming that the entire recorded stream is 202, the display from the I picture I1 to the P picture Pa is continuously read, and the B picture Bb to the P picture Pc In the display up to, a jump is made after reading up to the P picture Pa continuously, and the display continues from the first I picture (Ib-1) (FIG. 2 (b)) of the GOP including the B picture Bb to the P picture Pc. This is done by reading.

Here, as shown in FIG. 2, time information (hereinafter abbreviated as "PTS") indicating the display time of the I picture I1 in the first few minutes of the stream is represented by PTSstart1 and the last P picture Pa The PTS is PTSend1, and the PTS of the first B picture Bb in the stream for the next few minutes is PT
Sstart2, the PTS of the last P picture Pc is set to PTSsend2.
And The information edited by the operator is a PTS as shown in FIG.
Such time information is written as management information. The time information such as the PTS added to the moving picture encoded data on the disc 102
It is assumed that there is a rule that no overlap is made on 02. Information edited by the operator as described above is referred to as operator edited information.

Referring to FIG. 3, a procedure for reproducing the content edited by the operator will be described. Thumbnail image 303 representing the content edited by the operator and operator editing information 302
Are related by the management information 304. When reproducing the edited content, the operator selects one or a plurality of thumbnail images 303 displayed on the display device 305 using a selection means such as a cursor key (not shown) (). The operator edit information 302 of the management information associated with the selected thumbnail image is referred to (). Referring to the time information-GOP head address table 301 based on the operator edit information 302 (), the pickup device 1 shown in FIG.
03 is reproduced from a target address on the disk 102 (). These controls are all performed by the control unit 101.

Next, the arrangement of streams in the first storage means 108 and details of the operation of the data transfer control unit 109 will be described. As shown in FIG. 4, pictures starting from I1 are reproduced. First, moving image encoded data starting from I1 read from the disk 102 is transmitted to the modem 1
04, the signal is processed by the ECC circuit 105 and the scramble / descramble circuit 106 (FIG. 1), and the signals are stored in order from the address adr1 of the first storage means 108.
An area in the first storage means 108 used by the modem 104 and the ECC circuit 105 is defined as a work area. Control unit 10
1, the moving picture encoded data starting from I1 descrambled by the scramble / descramble circuit 106 is stored in the address ad in the first storage means 108.
It is assumed that the area is stored in order from r1, and the area up to adr_fend can be used.

If the data amount of the encoded video data from the pictures I1 to Pa is larger than the storage capacity that can be stored in the addresses adr1 to adr_fend in the first storage means 108, the scramble By controlling the / descramble circuit 106, the address adr_fend
After the data up to is written, the data is written again from the address adr1. However, during processing of the moving picture coded data from the pictures I1 to Pa, the scramble /
The moving image encoded data stored in the first storage unit 108 from the descramble circuit 106 is transmitted to the data transfer control unit 1.
It is necessary to ensure that new moving picture coded data is not stored in a portion that has not been read out to step 09.

In the transfer control unit 109, first, the control unit 101 sets from which address in the first storage means 108 to which address to use. The first to third sequencers 114, 116, and 118 receive this, and unless a new address setting is performed from the control unit 101,
The address management for the first storage unit 108 is performed independently. In the case of the above example, the first sequencer 114 can access the addresses adr1 to adr_fend of the first storage means 108 since one sequencer can handle moving image encoded data starting from the picture I1. Is set. After reading the data up to the address adr_fend in the first storage means 108, if necessary, the first sequencer 114 starts reading from the address adr1 without being newly set by the control unit 101. Is performed.

Next, the transfer control unit 109
Receives a control of which address of the first storage means 108 and how many bytes of the stream are to be read out, and outputs a stream read access request to the storage means control section 107 accordingly. The contents of the access request at this time are [1] a request to start transfer [2] read access [3] from which address in the first storage means 108 to start reading [4] what Whether to read bytes.

In this example, the number of bytes to be read in [4] is determined by the second storage unit 1 controlled by the first sequencer 114.
13 capacity. When the number of bytes of the stream controlled by the control unit 101 is larger than the number of bytes in the second storage unit 113, the first sequencer 114 performs processing until the processing of the control content from the control unit 101 ends, or a new control unit 1
From 01, until the control is performed, the data read requests ([1] to [4]) of the first storage unit 108 are divided and performed.

The control signal selector 111 receives the access request from the first sequencer 114 and
Output state.

The storage means control unit 107 is provided with the modem 10
4. Arbitrate with an access request from the ECC circuit 105, the scramble / descramble circuit 106, and the data transfer control unit 109 to the first storage unit 108, and permit access to the data transfer control unit 109 when permitting access. The data is transmitted to the data transfer control unit 109. The data transfer control unit 109 receives the access permission and starts reading the stream. The read stream is the selector 11
2 and is input to the first sequencer 114. Here, the stream is temporarily stored in the second storage unit 113 connected to the first sequencer 114.

Next, under the control of the control unit 101, the ES generation unit 120 transmits a data read request from the first sequencer 114 to the data transfer control unit 109.
The first sequencer 114 receives the data read request from the ES generation unit 120 and transmits the data stored in the second storage unit 113 to the ES generation unit 120. The selector 119 converts the data from the first sequencer 114 into ES
It is in a state of outputting to the generation unit 120.

The ES generation section 120 divides the data into moving picture coded data, audio coded data, and other data, and divides the moving picture coded data into the moving picture coding / decoding section 12.
2, the voice coded data is transferred to the voice coder / decoder 125.
And other data are transmitted to the control unit 101.

The encoded moving image data is decoded by the moving image encoding / decoding unit 122, and under the control of the control unit 101,
The timing is adjusted and output to the display device 123.

The voice coded data is decoded by voice coding / decoding section 125, and under the control of control section 101,
Timing is output to the speaker 126.

Next, with reference to FIG. 5, the operation of reproducing pictures Pa to Bb in which a temporal discontinuity point 201 (FIG. 2) occurs and picture Bb and thereafter will be described. The control unit 101 determines the time at which the discontinuous point occurs, as the operator editing information 302 in the operator management information 304 (FIG. 3),
It can be recognized by the information received from the ES generation unit 120. Then, before the discontinuous point occurs, the operator edit information 3
02 and the time information-GOP start address table 301, the moving image encoded data and the audio encoded data are read from the start address of the GOP including the Bb picture on the disk medium 102. The read stream is subjected to signal processing by a modem 104, an ECC circuit 105, and a scramble / descramble circuit 106 (FIG. 1).
It is assumed that the data is sequentially stored from the address adr2 (FIG. 5) in the first storage means 108, and the area up to the address adr_fend2 can be used.

The control unit 101 includes a data transfer control unit 109
In contrast, the rate at which the moving image encoded data and the audio encoded data from the data I1 to Pa currently remaining in the first storage means 108 are read out from the first storage means 108, and the current first storage means The ratio of reading out the moving image encoded data and the audio encoded data from the picture Ib-1 (FIG. 2B) being stored in the block 108 is designated. In addition, the control unit 101 determines the addresses adr2 to adr in the first storage unit 108 for the moving image encoded data and the audio encoded data from the picture Ib-1. The information to be stored up to fend2 and the data amount of the stream to be read are also controlled.

In summary, the contents of the control unit 101 controlling the data transfer control unit 109 include: [1] address information to be managed by the sequencer in charge of the control [2] sequencer in operation and the sequencer in charge of the control And at the same time access the storage means,
Access rate of each sequencer [3] This is the data amount of the stream read from the second storage unit 107 by the sequencer responsible for the control. Under this control, the inactive sequencer takes over the processing. Here, the sequencer responsible for the processing is the second sequencer 116.

The second sequencer 116 outputs a data read access request to the storage control unit 107. The content of the access request is the same as the above [1] to [4]. Here, since the first sequencer 114 and the second sequencer 116 are under control of the rate of data reading from the control unit 101, the access request is controlled by the control signal selector 111 as follows.

The control signal selector 111 has a simple counter 111b. For example, the sequencer 114
A data read request from the first storage means 108,
That is, a request to read out the data currently stored in the storage unit 108 in the moving picture encoded data and the audio encoded data of the pictures I1 to Pa, and the sequencer 11
6, the data read request from the first storage unit 108, that is, the current first storage unit 1 in the moving picture encoded data and the audio encoded data from the picture Ib-1.
The request to read the data being stored in 08 is 2:
It is assumed that it is controlled by 1. If the requests from the first sequencer 114 and the second sequencer 116 simultaneously output a data read transfer request, the control signal selector 111
Is counted up. When the ratio is controlled at 2: 1, the counter repeats a value from 0 to 2. The value of the counter 111b is "0", "1"
In the case of (1), a data read request from the first sequencer 114 is output to the storage control unit 107, and the counter 111
When the value of b is “2”, a data read request from the second sequencer 116 is output to the storage control unit 107.

The read data input from the storage means control unit 107 passes through the selector 112.
2 is synchronized with the control signal selector 111. That is, when the value of the counter 111b is “0” or “1”, data is read into the first sequencer 114 and the counter 111b
Is "2", data is read into the second sequencer 116. The control signal selector 111 operates only when the request from the first sequencer 114 and the request from the second sequencer 116 are simultaneously output, and the first sequencer 114 and the second sequencer 116
In the case of a data read request by itself, the data read request is output to the storage means control unit 107. By controlling the access request by the counter 111b in this manner, the circuit configuration is simplified, and the burden on the control unit 101 can be reduced.

Next, the operation of the ES generation unit 120 will be described. Before the time discontinuity occurs, the ES generation unit 120
Is controlled by the control unit 101 and the first sequencer 114
A data transfer control is performed to read data from both the second storage means 113 controlled by the second sequencer 116 and the second storage means 115 controlled by the second sequencer 116 alternately or as necessary. Output to the unit 109.

In the ES generation unit 120, under the control of the control unit 101, the data is divided into coded video data, coded audio data, and other data, and the coded video data is coded / decoded video. The encoded data is transmitted to the audio encoding / decoding unit 125, and the other data is transmitted to the control unit 101.

Next, the operation of the moving picture coding / decoding section 122 will be described. The moving picture coding / decoding section 122 starts decoding moving picture coded data from the picture Ib-1 in parallel with demodulating the coded moving picture data of the pictures I1 to Pa. The picture Bb is displayed after the display of the Pa picture. To decode the Bb picture, data obtained by decoding the moving picture coded data of the Ib-1 picture as shown in FIG. Since data obtained by decoding the moving picture coded data of the Pb + 2 picture is required, these data are temporarily stored in the storage unit 121 controlled by the moving picture decoding / decoding unit 122. Ib-1
When the moving picture coded data of the picture is decoded and the moving picture coded data of the Pb + 2 picture is decoded, or
The processing is temporarily suspended when the moving picture coded data of the Bb picture is decoded, and after the Pa picture is displayed on the display device, the timing is output so that the Bb picture is displayed. With the above processing, the display as edited by the operator is seamlessly reproduced. When the signal processing of the pictures I1 to Pa by the sequence 114 is completed, only the signal processing of the second sequencer 116 is performed.

Next, a description will be given of a circuit operation of the data transfer control unit 109 for performing so-called post-recording (after-recording), in which audio is recorded later in accordance with a moving image. As shown in FIG.
It is assumed that, while the moving image up to Pa (FIG. 2) is being reproduced, post-recording is performed while synchronizing audio with the moving image up to pictures Ia to Pa (not shown). I1 to P
It is assumed that the audio recorded in synchronization with the pictures up to a is not reproduced. It is assumed that the GOP configuration has an I picture at the head as shown in FIG. 7 and all pictures in the GOP can be decoded without using the picture data of the previous GOP.

First, as in the case of seamless playback,
As shown in FIG. 3, the operator displays the editing contents to be post-recorded on the thumbnail image 3 displayed on the display device 305.
Selection is made from 03 using selection means such as a cursor key (not shown) ().

The management information 304 is read in advance by the control unit 101 as needed, and
To read out the Pa stream from the disk 102 by the pickup device 103, the control unit 101 transmits the management information 30 associated with the selected thumbnail image 303.
Reference is made to the operator edit information 302 in FIG.

Referring to the time information-GOP start address table 301 in the management information 304 (), the pickup device 103 reproduces data from a target address on the disk 102 ().

The encoded video data is transmitted to the modem 104,
ECC circuit 105, scramble / descramble circuit
The signal is processed at 106 and the address in the first storage
Less adr1 ~ adr Suppose that it is stored in the area up to fend.
From the control unit 101 to the data transfer control unit 109,
Is controlled. [1] One sequencer is stored in the first storage unit 108
From the area from address adr1 to adr_fend
Read the system. [2] One sequencer is input from ES generation unit 120
Stream (header, etc. added to encoded audio data)
Stored in the first storage unit 108.
Addresses adr2 to adr in the storage means Area up to fend2
Use [3] of moving image code data from the first storage unit 108
For reading and writing of audio encoded data,
Controls the ratio for access to storage means control unit 107
I do.

Upon receiving the control signal, the data transfer control unit 1
At 09, reading of the stream from the first storage means 108 is performed by the first sequencer 114, and writing of the stream to the first storage means 108 is performed by the third sequencer 1.
18.

The sequencer 114 stores the first storage unit 108
And outputs a read access request for moving picture encoded data from the PC. The contents of the access request at this time are [1] a request to start transfer [2] read access [3] from which address in the first storage means 108 to start reading [4] what Whether to read bytes.

The number of bytes to be read in [4] depends on the capacity of the second storage means 113 controlled by the first sequencer 114. If the number of bytes of the stream controlled by the control unit 101 is larger than that of the second storage unit 113, the first sequencer 114 continues processing of the first storage unit 108 until the processing of the control content from the control unit 101 ends. The data read requests ([1] to [4]) are divided and performed. At this time,
The control signal selector 111 is in a state of outputting an access request of the first sequencer 114. The storage control unit 107 arbitrates between the modem 104, the ECC circuit 105, the scramble / descramble circuit 106, and an access request to the first storage unit 108 from the data transfer control unit 109, and arbitrates the data. If the access is permitted, the access permission is transmitted.

The data transfer control unit 109 receives this access permission and starts reading the stream. The read stream passes through the selector 112 and is input to the first sequencer 114. Here, the stream is stored in the second storage unit 11 connected to the first sequencer 114.
3 is temporarily stored. Next, under the control of the control unit 101, the ES generation unit 120 transmits a data read request from the first sequencer 114 to the data transfer control unit 109.

The first sequencer 114 includes the ES generation unit 1
In response to the data read request from the server 20, the data stored in the second storage unit 113 is transmitted to the ES generation unit 120. At this time, the selector 119 is in a state of outputting data from the first sequencer 114 to the ES generation unit 120.

The ES generation unit 120 divides the data into moving picture coded data, audio coded data, and other data.
The moving image encoded data is transmitted to the moving image encoding / decoding unit 122.
The encoded data is transmitted to the audio demodulation unit 125, and the other data is transmitted to the control unit 101. The encoded moving image data is decoded by the moving image encoding / decoding unit 122, and is output to the display device 123 with the timing adjusted under the control of the control unit.

The operator inputs sound from the microphone 127 when a picture (moving image from Ia) to be post-recorded is displayed on the display device 123. The voice encoding / subsequence conversion unit 125 compresses the voice input from the microphone 127 and stores the compressed voice in the temporary storage unit 124. Under the control of the control unit 101, the ES generation unit 120 outputs a signal for reading out the compressed audio data from the storage unit 124 to the audio encoding / decoding unit 125.

The ES generation section 120 adds a header such as information for temporally synchronizing with the displayed picture to the read audio encoded data. ES generation unit 12
0 indicates that when a stream (data obtained by adding a header to audio encoded data) can be output, the data transfer control unit 10
9, a signal indicating that output is possible is transmitted.
The sequencer 118 in the data transfer control unit 109 receives this signal and reads the stream. The stream is temporarily stored in the second storage means 117.

When the access request of the first sequencer 114 to the storage control unit 107 and the access request of the sequencer 118 to the storage control unit 107 are made simultaneously,
The control signal selector 111 transmits an access request for one of the first sequencer 114 and the sequencer 118 to the storage control unit 107 at a rate controlled by the control unit 101.

The contents of the access request from the sequencer 118 are: [1] a request to start a transfer [2] a write access [3] a write start from any address in the first storage unit 108 Or [4] How many bytes to write.

The sequence from the control signal selector 111 to the sequencer 1
18 is output, the storage control unit 1
07 arbitrates access requests from the modulator / demodulator 104, the ECC circuit 105, the scramble / descramble circuit 106, and the data transfer control unit 109, and when permitting the access request from the data transfer control unit 109, transmits an access permission signal. Output.

Data transfer control section 109 receives this access permission signal and outputs a stream. In response to an access request from the sequencer 118, the streams are stored in the addresses adr2 to adr of the first storage unit 108. Stored using the fend2 area. Stream is adr The data is stored up to fend2, and if there is voice encoded data to be stored, the data is stored from adr2. These addresses are managed by the sequencer 118.

The encoded voice data stored in the first storage means 108 is subjected to signal processing by the scramble / descramble circuit 106, the ECC circuit 105, and the modulation / demodulation section 109 under the control of the control section 101.
Recorded in.

As described above, according to the disk medium recording / reproducing (control) apparatus of the present embodiment, the first to third sequencers 114, 116, and 118 issue access requests, respectively, and , The encoded data is read from the second storage means 113, 1
15 and 117, the stream is not transferred with time continuity at the time of recording. Even if the frame is included in the middle of the playback, the sequencers 114, 116, and 118 perform address management and issue an access request so that continuity between frames is maintained, thereby performing seamless playback. be able to. In addition, the first to third sequencers 114, 116, and 118 perform address management of the first storage unit 108 independently of the control unit 101 and issue access requests, thereby reducing the load on the control unit 101. Can be.

Further, the sequencers 114 and 116 receive an instruction from the control unit 101 to transfer data having a data amount larger than the capacity of the second storage units 114 and 115 under the control of the respective sequencers 114 and 116. If
In order to maintain the continuity of data read from the first storage means 108, an access request for dividing and specifying the read start address and the amount of data to be read in the first storage means 108 is output, and until the control is completed. Independently to the first storage means 108 without receiving new control,
Since access requests for reading and writing are repeatedly performed, the load on the control unit 101 can be reduced.

The sequencers 114, 11
The control signal selector 111 arbitrates the access requests output from the control units 6 and 118 and outputs the access requests one by one via the control signal selector 111. 108
Can output only one access request and transfer only data from the sequencer that has output the access request.

The control signal selector 111 has a counter 111b that counts only when access requests are issued from a plurality of sequencers simultaneously. When the access requests are output from a plurality of sequencers simultaneously, the counter 111b In the case where an access request is output from one sequencer in accordance with the value of, and the access request is output only from one sequencer, the access of the sequencer outputting the access request is performed regardless of the value of the counter 111b. With a simple circuit configuration for outputting requests, access requests output from each sequencer can be selected while maintaining the priority.

The first to third sequencers 114, 1
16, 118, in this example the first
And the second sequencers 114 and 116 are connected to the video encoding / decoding unit 122 via a selector 119 for performing time-division transfer, and read from different addresses in the first storage unit 108. Since the encoded video data is transferred to the video encoding / decoding unit 122 through the selector 119 in a time-division manner, a plurality of streams are time-divided and transmitted to the video encoding / decoding unit 122. Can be transferred.

The first to third sequencers 114, 1
16, 118, in this example the third
Is a sequencer dedicated to audio encoded data transfer, and when the other sequencers 114 and 116 are performing the operation of transferring encoded video data for reproduction, the third sequencer 118 By configuring to perform the data transfer operation, in so-called post-recording in which audio data is recorded while reproducing moving image data, it is possible to realize display of reproduced moving images and recording of audio while ensuring seamlessness. it can.

[0090]

As described above, according to the present invention, encoded video data and / or encoded audio data encoded using inter-frame prediction is reproduced from a disk medium by the first control unit. In a disk recording / reproducing device,
One or more second control units issue an access request to the first storage unit for temporarily storing encoded data at the time of data reproduction, and read encoded data from an arbitrary address.
Since each is configured to be transferred to the decoding unit via the second storage unit, even if the streams that do not maintain temporal continuity at the time of recording are stored in separate areas in the first storage unit, The second controller performs address management and issues an access request so that continuity between frames is maintained, so that seamless reproduction can be performed. In addition, since the plurality of second control units perform address management of the first storage unit independently of the first control unit and issue an access request, the load on the first control unit can be reduced.

Further, the second control unit performs an operation for recording the encoded audio data and an operation for reproducing the encoded video data in parallel, so that the disk recording / reproducing apparatus capable of post-recording is performed. Can be realized. In addition, two second control units are provided to process the operation for recording the encoded audio data and the operation for reproducing the encoded video data separately and independently, thereby enabling more efficient processing. it can.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a playback and display procedure when a stream is jumped and played back.

FIG. 3 is an explanatory diagram of a process from an operation performed by an operator until a pickup device reads target information from a disk medium.

FIG. 4 is an explanatory diagram of signal processing when reproducing a picture in a portion having no temporal discontinuity.

FIG. 5 is an explanatory diagram of signal processing when seamlessly reproducing a picture of a portion where a temporal discontinuity occurs.

FIG. 6 is an explanatory diagram of signal processing at the time of post-recording.

FIG. 7 is an explanatory diagram showing a GOP configuration.

8 is a diagram showing a recording order of encoded video data on a disk medium in the case of the GOP configuration shown in FIG. 7;

FIG. 9 is an explanatory diagram of a procedure for decoding encoded video data.

FIG. 10 is an explanatory diagram of a playback and display procedure when a stream is skipped and played back.

FIG. 11 is a block diagram of a conventional disk reproducing apparatus.

FIG. 12 is an explanatory diagram showing conventional index frame information.

[Explanation of symbols]

 Reference Signs List 101 control unit 102 disk medium 103 pickup device 108 storage unit 109 data transfer control unit 111 control signal selector 112 selector 113, 115, 117 second storage unit 114 first sequencer 116 second sequencer 118 third sequencer 119 selector 122 Video Encoding / Decoding Unit 125 Audio Encoding / Decoding Unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/32 H04N 7/137 Z F term (Reference) 5C052 AA02 AA03 AB02 AC08 CC11 CC12 EE03 5C053 FA14 FA23 GB06 GB11 GB15 GB29 HA29 HA33 JA12 JA24 KA01 KA08 5C059 KK00 KK36 MA05 PP05 PP06 PP07 RC04 SS11 SS30 UA38 5D044 AB07 BC03 BC06 CC04 DE94 DE96 FG10 FG19 FG23

Claims (7)

[Claims] 1. A disk recording / reproducing apparatus for reproducing video encoded data and / or audio encoded data encoded using inter-frame prediction from a disk medium by a first control unit, comprising: First storage means for temporarily storing encoded data during data reproduction; second storage means including a plurality of storage units for temporarily storing encoded data read from the first storage means; first storage A second control unit capable of controlling the address management in the means and the writing of a series of encoded data read from the first control unit to the storage unit independently of the first control unit;
Wherein the encoded data is read from the first storage unit in response to an access request from the second control unit, and is transferred to the decoding unit via the second storage unit. Recording and playback device. 2. The first and second storage units of the second storage unit are connected to the decoding unit via a selector for performing a time-division transfer, and the first and second storage units in the disk medium are discontinuous. When reproducing the second coded data group, the second control unit controls the first coded data group.
Read the first and second encoded data groups from the storage means,
Temporarily storing the first and second encoded data groups in the first and second storage units for each encoded data group, and further transferring the first and second encoded data groups to the decoding unit via the selector in a time-division manner. 2. The disk recording / reproducing apparatus according to claim 1, wherein: 3. The second storage unit has first and third storage units, and the second control unit decodes encoded moving image data for reproduction using the first storage unit. Transfer operation to the
2. The disk recording / reproducing apparatus according to claim 1, wherein the operation of transferring the encoded audio data for recording on the disk medium to the first storage means is performed in parallel using the storage unit. 4. When the second control unit receives a data transfer instruction of a data amount larger than the capacity of the storage unit from the first control unit, the second control unit stores the address in the first storage unit. The disk according to any one of claims 1 to 3, wherein the storage of the divided data in one storage unit and the transfer of the divided data stored in the storage unit to the decoding unit are repeated while maintaining the continuity of the disk. Recording and playback device. 5. The disk recording / reproducing apparatus according to claim 1, wherein a plurality of the second control units are provided corresponding to the respective storage units. 6. A control signal selector for arbitrating an access request to said first storage means output from said plurality of second control units, wherein said access requests are transmitted one by one via said control signal selector. 6. The disc recording / reproducing apparatus according to claim 5, wherein the disc is output. 7. The control signal selector has a counter that counts only when access requests are simultaneously issued from the plurality of second control units, and the control signal selector performs the first storage from the plurality of second control units. When an access request to the means is output simultaneously, an access request from a corresponding one of the second control units is output according to the value of the counter, and the first control unit outputs the first request from the second control unit. When there is a single access request to the storage means, regardless of the value of the counter,
7. The disk recording / reproducing apparatus according to claim 6, wherein an access request from the second control unit outputting the access request is output.