JP2004072790A - Av data recording apparatus and method, disk recorded with the same av data recording apparatus or method, and av data reproducing apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AV data recording apparatus and method in which various kinds of processing (continuous reproduction, digital transmission, filing operation, partial deletion and postrecording) to recorded video are facilitated. <P>SOLUTION: In the AV data recording apparatus wherein an audio signal and a video signal are divided into transport packets each having a predetermined unit length, and the plurality of transport packets are assembled as a transport stream and recorded, it is managed whether or not a logic block is used, a continuous data area composed of a plurality of logic blocks guaranteeing real-time continuous reproduction is detected, a logic block number of the continuous data area to be recorded is indicated, and the transport stream is continuously recorded on the plurality of detected continuous data areas. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an AV data recording / reproducing apparatus and method for real-time MPEG compression of video and audio and recording the same on a recording medium such as an optical disk.

As a method for compressing a video at a low bit rate, there is a system stream defined in the MPEG2 standard (ISO / IEC 13818-1). The system stream defines three types: a program stream, a transport stream, and a PES stream.

On the other hand, optical disks such as DVD-RAMs and MOs are attracting attention as video recording media replacing magnetic tapes. Among them, there is “Video Recording Standard” (DVD Specifications for Re-writable / Re-recordable Discs Part 3 VIDEO RECORDING version 1.0 September 1999) as a standard for recording video on a DVD-RAM. FIG. 27 shows a configuration diagram of a conventional real-time video recording / reproducing apparatus using a DVD-RAM disk. In FIG. 27, signals input from the video signal input unit 1 and the audio signal input unit 2 are compressed by the video compression unit 3 and the audio compression unit 4, respectively, and a program stream is created by the program stream assembling unit 51. The data is written to the DVD-RAM disk 81 via the pickup 7. At the time of reproduction, the program stream taken out via the pickup 7 and the reproduction unit 31 is separated into a video signal and an audio signal by the program stream decomposition unit 37, and the video stream is displayed via the video expansion unit 33 and the audio expansion unit 34, respectively. It outputs to the unit 35 and the audio output unit 36.

To output a video signal to the outside via the 1394 interface, the PS / TS conversion and output timing adjustment unit 11 converts the program stream extracted via the reproduction unit 31 into a transport stream, and then passes the program stream to the 1394 interface unit 9. When a video signal is input and recorded via the 1394 interface unit 9, the transport stream format video signal input from the outside to the 1394 interface is converted into a program stream format by the TS / PS converter 12, and the recording unit 6 Then, the data is recorded on the DVD-RAM disk 81 via the CPU.

(4) When recording a video signal, the recording control section 61 controls the recording section 6. Further, the continuous data area detection unit 62 checks the use status of the sector managed by the logical block management unit 63 according to the instruction of the recording control unit 61, and detects a physically continuous free area.

(4) When deleting a recorded video signal file, the deletion control unit 64 controls the recording unit 6 and the reproduction unit 31 to execute a deletion process.

(4) If post-recording (after-recording) is to be performed after recording, video recording is performed in advance while activating the post-recording dummy packet generator 10. As a result, dummy data for dubbing is mixed in the MPEG system stream.

When performing post-recording, the post-recording control section 65 activates the reproduction section 31 to show the video that has been recorded to the user in advance, and at the same time, controls the recording section 6 to record a back sound in accordance with the video. This completes the post-recording process.

FIG. 28 shows a recording format when video is recorded on a DVD-RAM in real time. The DVD-RAM is composed of 2 Kbyte sectors. Sixteen sectors are treated as one logical block, and an error correction code is added to each logical block and recorded on the DVD-RAM. Further, a physically continuous logical block of 11 seconds or more in terms of the maximum recording / reproducing rate is secured as one continuous data area, and a unit video packet (Video @ OBject) composed of an MPEG stream of 0.4 to 1 second is allocated to this area. UNIT: hereinafter referred to as “VOBU”). One VOBU is composed of a pack which is a lower layer of the MPEG program stream in units of 2 Kbytes. The pack is composed of two types, a video pack (V_PCK) storing video compression data and an audio pack (A_PCK) storing audio compression data. Further, one VOBU includes all V_PCK and A_PCK of the corresponding time.

The continuous data area detection unit 62 of the AV data recording / reproducing apparatus re-detects the next continuous data area when the remainder of one continuous data area is less than 3 seconds in terms of the maximum recording / reproducing rate. When one continuous data area becomes full, writing is performed on the next continuous data area.

In FIG. 29, the recorded contents on the DVD-RAM are managed by a UDF (Universal Disk Format) file system or an ISO / IEC 13346 (Volume and file structure of write once and rewritable media using non-seqential recording for information interchange) file system. FIG. In FIG. 29, one continuously recorded MPEG program stream is a file VR_MOVIE. Recorded as VRO. In this file, the file name and the position of the file entry are managed by FID (File Identifier Descriptor).

ＵThe UDF standard is equivalent to a subset of the ISO / IEC 13346 standard. Also, by connecting the DVD-RAM drive to a personal computer via the 1394 interface and the SBP-2 (Serial Bus Protocol-2) protocol, a file written in a UDF-compliant form is handled as one file from the personal computer. It is possible.

{File entry manages continuous data areas a, b, and c in which data is stored using an allocation descriptor. Specifically, when a defective logical block is found during recording in the continuous data area a by the recording control unit 61, the logical block is skipped and writing is continued from the head of the continuous data area b. Then, since the recording control unit 61 collides with the recording area of the PC file during recording in the continuous data area b, the writing is continued from the head of the continuous data area c. As a result, the file VR_MOVIE. VRO is composed of continuous data areas a, b, and c.

FIG. 30 shows the configuration of the allocation descriptor. FIG. 30 (a) shows a short allocation descriptor (Short Allocation Descriptor), and FIG. 30 (b) shows an extended allocation descriptor (Extended Allocation Descriptor).
Allocation Descriptor). The extent length (Extent Length) indicates the data size in bytes, and the extent position (Extent Position / Extent Location) indicates the start sector number of the data. The record length (Record Length) indicates the data size actually recorded in bytes. The information length (Information Length) indicates the data size before compression in bytes when the data is compressed. The usable area is an area that can be used freely. As a description rule of the allocation descriptor, the start position of the data referred to by the allocation descriptors a, b, and c in FIG. 29 coincides with the beginning of the sector, and is referred to by the allocation descriptors a and b other than the last allocation descriptor c. The extent length of the data to be written needs to be an integral multiple of one sector. However, by using the record length of the extended allocation descriptor, the restriction that the effective data length is an integral multiple of one sector can be avoided, and effective data shorter than the extent length can be arranged. The specification of the extended allocation descriptor is defined in the ISO / IEC 13346 standard, but its use is not permitted in the UDF standard adopted by DVD-ROM / RAM. The type of the allocation descriptor is described in the file entry.

The data size of one VOBU fluctuates within the range of the maximum recording / reproducing rate if the video has a variable bit rate. If the video is a fixed bit rate, the data size of the VOBU is almost constant.

(4) When reproducing recorded contents, data read from the phase-change optical disc and reproduction of the read data are simultaneously performed. At this time, the data reading rate is set to be higher than the maximum data reproducing rate, and control is performed so that there is no data to be reproduced. Therefore, if continuous data reading and continuous data reproduction are continued, extra data to be reproduced can be secured by the rate difference between the maximum data reproduction rate and the data read rate. By using such extra data as reproduction data while data reading is interrupted by a pickup jump, continuous reproduction can be realized.

More specifically, if the data read rate of the reproducing unit 31 is 11 Mbps, the maximum data reproducing rate of the program stream assembling unit 5 and the program stream decomposing unit 37 is 8 Mbps, and the maximum moving time of the pickup is 3 seconds, 24 Mbps during the moving of the pickup Extra bits of data are required as extra reproduction data. In order to secure such extra data, continuous reading for 8 seconds is required. That is, it is necessary to continuously read data for a time obtained by dividing 24 Mbits by the difference between the data read rate of 11 Mbps and the maximum data recording / reproducing rate of 8 Mbps.

Therefore, data of a maximum of 88 Mbits, that is, reproduced data of 11 seconds, is read during the continuous data reading of 8 seconds. By securing a continuous data area of 11 seconds or more, continuous data reproduction can be performed. It is possible to guarantee.

Note that there may be several defective logical blocks in the middle of the continuous data area. However, in this case, it is necessary to secure a continuous data area slightly longer than 11 seconds in anticipation of the read time required to read the defective logical block required during reproduction.

光 デ ィ ス ク One of the merits of an optical disk not provided on a magnetic tape is a function of increasing a recordable capacity by deleting a part desired by a user. If the specific VOBU # 51 in the middle of the program stream shown in FIG. 31 is deleted and the VOBU # 52 and subsequent portions are shifted forward as shown in FIG. 32, the size of the VOBU # 51 can be reduced without breaking the format of the program stream. Free space can be increased.

Also, one of the functions normally provided in consumer movies is after-recording (hereinafter, referred to as "after-recording"). The audio dubbing is a function of dubbing a once-recorded video sound (hereinafter referred to as “front sound”) to a newly recorded sound (hereinafter referred to as “back sound”). With such a function, it is possible to reproduce the back audio in synchronization with the video at the time of reproduction.

On the other hand, a plurality of audios can be mixed and recorded in the MPEG system stream, and each audio is identified by a stream ID number. For example, the stream ID of the front audio can be distinguished as “0xE0”, and the stream ID of the back audio can be distinguished as “0xE1”.

FIG. 33 shows the recorded contents on the premise of post-recording in an AV data recording / reproducing apparatus using a DVD-RAM. In the DVD-RAM, when recording an MPEG program stream on the premise of post-recording as shown in FIG. 33, the post-record dummy packet generation unit 10 in FIG. ) And record. At the time of post-recording (at the time of recording of the back audio), only the video (or the video and the back audio) is reproduced, and at the same time, the result of compressing the back audio is embedded at the position of D_PCK as a back audio pack different from the front audio.

During playback, you can watch the dubbed video by playing back the video stream and the back stream audio stream.

ＡＶ Future AV devices tend to be equipped with an IEEE 1394 digital interface as standard. However, as a video transmission protocol using synchronous transfer on the IEEE 1394 interface, only an MPEG transport stream is specified.

Therefore, in a conventional AV data recording apparatus, when transmitting a video to a D-VHS or a set-top box (STB) via an IEEE1394 digital interface, the MPEG program stream is first converted to a PES stream, and then the MPEG transport is performed. It needed to be converted to a stream, requiring a complex conversion system.

On the other hand, in the case of recording with the MPEG transport stream, if the head of one VOBU having a length of a multiple of 188 bytes and the head of a logical block match as shown in FIG. Can be expressed with a small number of bits, but there is a problem that a maximum (32K-1) -byte useless area is generated for each VOBU. For example, in the case of an MPEG transport stream of 1.5 Mbps in which one VOBU is 0.5 seconds for one VOBU, this waste area corresponds to a maximum of 4% of the total recording area, and an average of 2%.

In this case, in order to make the recorded contents appear as one file on a personal computer, it is necessary to link the entire recorded contents using one allocation pointer, for example. Then, since an empty area is inserted in the middle of the file, there is also a problem that the personal computer cannot be shown as one file conforming to the MPEG standard.

Further, for example, when each VOBU is handled as one file by referring to the file using an independent extended allocation pointer, a large number of allocation pointers are required for one file, and a read driver conforming to the UDF standard is required. There is also a problem that a personal computer equipped with software cannot be handled as one file because it does not support the extended allocation pointer.

Also, in general, after a user records an MPEG program stream on an optical disc and deletes a VOBU in the middle, it can be managed as one file in a storage device, or can be handled as one file when connected to a personal computer. In order to do so, it is necessary to connect the VOBUs after the deleted VOBU to the front and copy the subsequent VOBUs to the left justified. This processing has a problem that the processing amount increases as the area of the subsequent VOBU becomes longer.

Furthermore, when the dummy pack is exchanged for the back audio during the post-recording of the MPEG program stream recorded on the optical disk, the entire logical block (the logical block #i in FIG. 33) including the dummy pack is once read. After that, a process (Read \ Modified \ Write: hereinafter, referred to as "RMW") occurs in which only the dummy pack portion is exchanged for a back audio packet and written back to the same logical block. Such processing has a high processing load, and it has been practically difficult to realize post-recording.

In order to solve the above-mentioned problems, the present invention provides a video recording apparatus capable of easily recording video and continuously reproducing video with a D-VHS or a set-top box (STB) via an IEEE1394 digital interface. The purpose is to realize.

Further, it is another object of the present invention to realize a recording in which the MPEG transport stream recorded when a personal computer is connected is easily viewed as data conforming to the MPEG standard, with little waste of storage capacity.

As described above, the present invention guarantees real-time recording / real-time reproduction using synchronous transfer means of video and audio via a digital interface, and guarantees reproduction of files using asynchronous transfer means when connected to a personal computer (files conforming to the MPEG standard). The recording method can be easily and efficiently realized.

Also, when a VOBU in the middle of an MPEG system stream is deleted, subsequent VOBUs are connected so that the stream can be managed as a single stream in the recording device, or when a personal computer is connected, the stream can be viewed as a stream conforming to the MPEG standard. It is intended to significantly reduce the processing amount.

(4) It is another object of the present invention to significantly reduce the amount of arithmetic processing in post-recording processing of MPEG system streams.

In order to achieve the above object, an AV data recording apparatus according to the present invention comprises: a transport stream assembling unit for dividing an audio signal and a video signal into transport packets and assembling a plurality of transport packets as a transport stream; A recording unit that records a stream, wherein the recording unit is a logical block management unit that manages whether a logical block on a disk is used or not, and a continuous unit that guarantees real-time continuous reproduction of audio and video signals. A plurality of continuous data areas detected by the continuous data area detection unit, including a continuous data area detection unit for detecting a data area, and a recording control unit for indicating a logical block number of the continuous data area in which a transport stream is to be recorded Characterized in that a transport stream is continuously recorded thereon. .

With this configuration, even when real-time recording / real-time reproduction is performed via the 1394 interface, there is no need to perform a special stream conversion process, so that it can be easily realized. At the same time, it is possible to reduce the useless area in the recording area and to perform efficient recording. Further, at the time of reproduction, continuous reproduction can be guaranteed. Further, it is possible to efficiently realize that the file is viewed as a stream file conforming to the MPEG standard when connected to a personal computer.

Also, in the AV data recording apparatus according to the present invention, the continuous data area detection unit can continuously record at the maximum recording / reproducing rate for a time longer than the time required to secure reproduction for the maximum moving time of the read / write head. It is preferable to detect a continuous data area composed of a plurality of logical blocks. This is because movement of the read / write head such as seeking can be permitted.

Further, in the AV data recording apparatus according to the present invention, the transport stream assembling section divides the audio signal and the video signal into transport packets and configures a plurality of transport packets for a predetermined time length as one unit packet. Preferably, the transport stream is assembled by arranging the unit packets. This is for efficient recording in a more manageable form.

In the AV data recording apparatus according to the present invention, it is preferable that the transport stream assembling section assembles a transport stream including transport packets conforming to digital broadcasting using MPEG. This is because the function of a digital device using MPEG can be utilized.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention divides an audio signal and a video signal into PES (Packetized Elementary stream) packets and assembles a plurality of PES packets into a PES stream. And a recording unit for recording a PES stream. The recording unit performs a real-time continuous reproduction of an audio signal and a video signal, and a logical block management unit that manages whether a logical block on a disk is used. A continuous data area detection unit for detecting a continuous data area to be guaranteed; and a recording control unit for indicating a logical block number of the continuous data area in which a PES stream is to be recorded, and a plurality of continuous data areas detected by the continuous data area detection unit. The PES stream is continuously recorded on the data area.

With this configuration, PES / TS conversion and TS / PES conversion are required. However, since such conversion processing is lighter than PS / TS conversion and TS / PS conversion in the case of a program stream, connection via the 1394 interface is required. Can be realized relatively easily.

Further, in the AV data recording apparatus according to the present invention, the continuous data area detecting unit can continuously record at the maximum recording / reproducing rate for a time equal to or longer than the time required to secure reproduction for the maximum moving time of the read / write head. It is preferable to detect a continuous data area composed of a plurality of logical blocks. This is because movement of the read / write head such as seeking can be permitted.

Further, in the AV data recording apparatus according to the present invention, the PES stream assembler divides the audio signal and the video signal into PES packets, and configures a plurality of PES packets for a predetermined time length as one unit packet. It is preferable to assemble a PES stream by arranging packets. This is for efficient recording in a more manageable form.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention comprises a writer for writing data to a logical block on a disk, a reader for reading data recorded on the logical block, and a reader. A deletion control unit for controlling the writing unit to delete data, wherein the deletion control unit deletes part of data recorded as one file on a plurality of logical blocks, Of the logical block including the previous valid data area, the deleted logical area, the valid data area in the last logical block, and the valid data area after the last logical block. In the last logical block, and the three areas are treated as one file.

(4) With this configuration, it is not necessary to perform the justification process on all the valid data after the deletion area, so that the processing efficiency can be greatly improved.

Next, to achieve the above object, an AV data recording apparatus according to the present invention has a system stream assembling section that assembles audio signals and video signals as a system stream, and a recording section that records a system stream. A logical block management unit that manages whether a logical block on the disk is used, a continuous data area detection unit that detects a continuous data area that guarantees real-time continuous reproduction of audio and video signals, and a system. A recording control unit for indicating a logical block number of a continuous data area in which a stream is to be recorded, and continuously recording a system stream on a plurality of continuous data areas detected by the continuous data area detection unit, and Records multiple dummy data equal to the logical block in the logical block, Data only, further comprising a dubbing control unit for replacing the speech data.

With this configuration, it is only necessary to replace the dummy data having the size of a plurality of logical blocks with audio data, so that it is not necessary to perform the process of reading the entire logical block and the partial rewriting process in the logical block, which greatly increases the processing load. A significant reduction can be expected.

Also, in the AV data recording apparatus according to the present invention, the after-recording control unit continuously records the system stream on the plurality of continuous data areas detected by the continuous data area detection unit, and at the same time, the total size is larger than the logical block. It is preferable to record a plurality of dummy data in one or more logical blocks, and replace only dummy data included in a predetermined logical block with audio data at the time of post-recording. This is because the same effect can be expected even when the size of the dummy packet is not an integral multiple of the size of the logical block.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention comprises: a writer for writing data to a logical block on a disc; a reader for reading data recorded on the logical block; And a deletion control unit for controlling the reading unit and deleting the data. When the deletion control unit deletes a part of the data recorded as one file on the plurality of logical blocks, the deletion area The first half of adding a dummy packet after the valid data area before the deletion area until the data of the previous valid data area reaches the boundary of the logical block, and the valid data area after the deletion area from the logical block boundary. Until the start point, the latter half of the dummy data added so that the packet is continuous before the valid data area behind the deletion area is treated as one file It is characterized in.

(4) With this configuration, it is not necessary to perform any front-justification processing on the valid data after the deletion area, so that the processing efficiency can be greatly improved.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention comprises: a writer for writing data to a logical block on a disc; a reader for reading data recorded on the logical block; And a deletion control unit for controlling the reading unit and deleting the data. The deletion control unit deletes a front part of data recorded as one file on a plurality of logical blocks as a deletion area. When leaving the rear part as a valid data area, from the boundary of the logical block before the end of the deletion area to the end of the valid data area, data obtained by adding a dummy packet so that packets continue in front of the valid data area, The effective data area is handled as one file.

も According to such a configuration, it is not necessary to perform the justification process on the valid data after the deletion area, so that the processing efficiency can be greatly improved.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention comprises a writer for writing data to a logical block on a disk, and a management information writer for writing management information of the written data to the logical block. Wherein the management information writing unit writes the management information of the data including the start position of the data on the logical block, the length of the data, and the identification of the logical block in which the data is written.

With such a configuration, the degree of freedom of the linkable area is increased by the data management information, so that the writable area can be managed only by the pointer processing without performing the justification processing or the dummy data embedding processing, and the standard conformity can be achieved. The processing load for securing can be reduced.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention comprises: a writer for writing data to a logical block on a disc; a reader for reading data recorded on the logical block; And a deletion control unit for controlling the reading unit and deleting the data. The writing unit, when writing the data, starts the data on the logical block, the length of the data, and the logic for writing the data. The management information of the data composed of the block identification is separately written, and the deletion control unit deletes the effective data before the deletion area when deleting a part of the data recorded as one file on the plurality of logical blocks. It is characterized in that it is divided into an area and an effective data area after the deletion area, and the two areas are treated as one file.

With this configuration, the degree of freedom of the linkable area is increased by the data management information, and the new writable area can be managed only by the pointer processing without performing the front-justification processing or the dummy data embedding processing at the time of data deletion. As a result, it is possible to reduce the processing load for ensuring standard conformity.

In the AV data recording apparatus according to the present invention, it is preferable that the deletion control unit further inserts and records a DIT packet between a valid data area before the deletion area and a valid data area after the deletion area. . This is because the DIT packet can be used as a trigger to detect that the stream of the valid data area after the deletion area is a new stream that is discontinuous from the stream of the valid data area before the deletion area.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention divides an audio signal and a video signal into transport packets and repeats a set of transport packets and transmission timing information for each transport packet. A transport stream assembly with transmission timing information for assembling as a transport stream with transmission timing information, and a recording unit for recording the transport stream with transmission timing information, wherein the recording unit uses a logical block on a disc. A logical block management unit that manages whether or not the data stream is transmitted, a continuous data area detection unit that detects a continuous data area that guarantees real-time continuous playback of audio and video signals, and a transport stream with transmission timing information. Logic of continuous data area And a recording control unit that instructs the lock number, characterized by continuous recording of the transport stream with the transmission timing information into a plurality of contiguous data area detected by the continuous data area detecting section.

With this configuration, it is possible to output via the 1394 interface only by simple timing adjustment without newly generating output timing.

Also, in the AV data recording apparatus according to the present invention, in the transport stream assembling unit with transmission timing information, the audio signal and the video signal are divided into transport packets, and a plurality of transport packets for a predetermined time length are transmitted. It is preferable to form one unit packet by repeatedly arranging a set of transmission timing information for each packet, and assemble a transport stream by arranging the unit packets. This is for efficient recording in a more manageable form.

In the AV data recording apparatus according to the present invention, it is preferable that the transport stream with transmission timing information assembles a transport stream including transport packets conforming to digital broadcasting using MPEG. This is because the function of a digital broadcasting device using MPEG can be utilized.

In addition, in the AV data recording apparatus according to the present invention, it is preferable that the transport stream assembling unit with the transmission timing information include a 27 MHz counter value as the transmission timing information. Furthermore, in the AV data recording apparatus according to the present invention, it is preferable that the transport stream assembling unit with transmission timing information includes a counter value of 24.576 MHz as transmission timing information. At 27 MHz, a clock or the like used for video recording / reproduction can be used, and at 24.576 MHz, the output clock can be easily adjusted because it matches the reference clock of the 1394 interface.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention has a receiving unit that receives a transport stream in real time from a communication channel, and a recording unit that records a transport stream. A logical block management unit that manages whether a logical block on the disk is used, a continuous data area detection unit that detects a continuous data area that guarantees real-time continuous playback of a transport stream, and a transport stream. And a recording control unit for indicating a logical block number of a continuous data area to be recorded, wherein the transport stream is continuously recorded on a plurality of continuous data areas detected by the continuous data area detection unit. .

With this configuration, even in the case of real-time input via the 1394 interface, there is no need to perform special stream conversion processing, so that video recording can be easily realized. At the same time, it is possible to reduce the useless area in the recording area and to perform efficient recording. Further, at the time of reproduction, continuous reproduction can be guaranteed. Further, it is possible to efficiently realize that a stream is compliant with the MPEG standard when connected to a personal computer.

Next, in order to achieve the above object, an AV data recording apparatus according to the present invention comprises: a receiving unit for receiving a transport stream in real time from a communication path; A recording unit for recording as a transport stream with attached data, wherein the recording unit manages whether a logical block on the disk is used or not, and a real time of the transport stream with transmission timing information. A continuous data area detection unit for detecting a continuous data area for guaranteeing continuous reproduction, and a recording control unit for indicating a logical block number of a continuous data area in which a transport stream with transmission timing information is to be recorded, Transmission time on multiple continuous data areas detected by the Characterized by continuously recording the transport stream with ring information.

With this configuration, even if the real-time input via the 1394 interface has transmission timing information added thereto, there is no need to perform a special stream conversion process, so that video recording can be easily realized. Further, at the time of reproduction, continuous reproduction can be guaranteed. Further, it is possible to efficiently realize that a stream is compliant with the MPEG standard when connected to a personal computer.

Next, in order to achieve the above object, an AV data reproducing apparatus according to the present invention comprises a disk recorded by the above-described AV data recording apparatus, a reproducing unit for reading a transport stream recorded on the disk, and an MPEG. A timing generator for calculating the transmission timing of the transport stream in accordance with the standard; and a 1394 interface for transmitting the transport packet onto the 1394 transmission path. The 1394 interface is configured to transmit the transport stream in accordance with the transmission timing calculated by the transmission timing generator. It is characterized in that a packet is transmitted onto a 1394 transmission line.

構成 With this configuration, real-time playback via the 1394 interface can be guaranteed.

Next, in order to achieve the above object, an AV data reproducing apparatus according to the present invention comprises a reproducing apparatus for reading a disk recorded by the above-described AV data recording apparatus and a transport stream with transmission timing information recorded on the disk. And a 1394 interface unit for transmitting a transport packet onto a 1394 transmission path, the 1394 interface unit comprising: a timing adjustment unit for reproducing a transmission timing according to transmission timing information of a transport stream with transmission timing information; The transport packets are transmitted onto the 1394 transmission path in accordance with the transmission timing reproduced by.

With this configuration, real-time reproduction via the 1394 interface can be realized using the transport stream with transmission timing information.

Next, in order to achieve the above object, an AV data recording method according to the present invention comprises the steps of: dividing an audio signal and a video signal into transport packets, assembling a plurality of transport packets as a transport stream; And a step of managing whether or not a logical block on the disk is used, a step of detecting a continuous data area that guarantees real-time continuous reproduction of an audio signal and a video signal, and a transformer. Indicating a logical block number of a continuous data area in which a port stream is to be recorded, wherein the transport stream is continuously recorded on the plurality of detected continuous data areas.

With such a configuration, even when real-time recording / real-time reproduction via the 1394 interface is realized, there is no need to perform a special stream conversion process, so that it can be easily realized. At the same time, it is possible to reduce the useless area in the recording area and to perform efficient recording. Further, at the time of reproduction, continuous reproduction can be guaranteed. Further, it is possible to efficiently realize that the file is viewed as a stream file conforming to the MPEG standard when connected to a personal computer.

Further, in the AV data recording method according to the present invention, in the step of detecting the continuous data area, recording at the maximum recording / reproducing rate can be performed for a time longer than the time required to secure reproduction for the maximum moving time of the read / write head. It is preferable to detect a continuous data area including a plurality of consecutive logical blocks. This is because movement of the read / write head such as seeking can be permitted.

In the AV data recording method according to the present invention, the audio signal and the video signal are divided into transport packets, a plurality of transport packets for a predetermined time length are configured as one unit packet, and the unit packets are arranged. It is preferable to assemble the transport stream. This is for efficient recording in a more manageable form.

In the AV data recording method according to the present invention, in the step of assembling the transport stream, it is preferable to assemble a transport stream including transport packets conforming to digital broadcasting using MPEG. This is because the function of a digital broadcasting device using MPEG can be utilized.

Next, in order to achieve the above object, the AV data recording method according to the present invention comprises the steps of dividing an audio signal and a video signal into PES packets, assembling a plurality of PES packets as a PES stream, and recording the PES stream. And a step of managing whether or not a logical block on the disk is used, a step of detecting a continuous data area that guarantees real-time continuous reproduction of audio and video signals, and a step of recording a PES stream. Indicating a logical block number of a continuous data area to be powered, wherein the PES stream is continuously recorded on the detected plurality of continuous data areas.

With this configuration, PES / TS conversion and TS / PES conversion are required. However, since such conversion processing is lighter than PS / TS conversion and TS / PS conversion in the case of a program stream, connection via the 1394 interface is required. Can be realized relatively easily.

Further, in the AV data recording method according to the present invention, in the step of detecting the continuous data area, recording at the maximum recording / reproducing rate can be performed for a time longer than the time required to secure reproduction for the maximum moving time of the read / write head. It is preferable to detect a continuous data area including a plurality of consecutive logical blocks. This is because movement of the read / write head such as seeking can be permitted.

Further, the AV data recording method according to the present invention divides an audio signal and a video signal into PES packets, configures a plurality of PES packets for a predetermined time length as one unit packet, and arranges the unit packets to form a PES packet. It is preferred to assemble the stream. This is for efficient recording in a more manageable form.

Next, in order to achieve the above object, an AV data recording method according to the present invention controls a step of writing data to a logical block on a disk and a step of reading data recorded in the logical block to delete the data. When a part of data recorded as one file on a plurality of logical blocks is deleted, a valid data area before the delete area and a last logical block of the logical block including the delete area are included. Dividing the effective data area in the block and the effective data area after the last logical block into three areas, and shifting the undeleted effective data in the last logical block to the left in the last logical block; It is characterized in that three areas are handled as one file.

(4) With this configuration, it is not necessary to perform the justification process on all the valid data after the deletion area, so that the processing efficiency can be greatly improved.

Next, in order to achieve the above object, an AV data recording method according to the present invention includes a step of assembling an audio signal and a video signal as a system stream, and a step of recording the system stream. A step of managing whether or not the system stream is used; a step of detecting a continuous data area that guarantees real-time continuous reproduction of audio and video signals; and indicating a logical block number of the continuous data area in which a system stream is to be recorded. And a system stream is continuously recorded on the detected plurality of continuous data areas.At the same time, a plurality of dummy data having a total size equal to the logical block is recorded in the logical block. The method further includes a step of replacing the voice data.

With this configuration, it is only necessary to replace the dummy data having the size of a plurality of logical blocks with audio data, so that it is not necessary to perform the process of reading the entire logical block and the partial rewriting process in the logical block, which greatly increases the processing load. A significant reduction can be expected.

In the AV data recording method according to the present invention, the step of replacing only the dummy data with audio data at the time of post-recording includes continuously recording a system stream on a plurality of detected continuous data areas, and simultaneously, when the total size is It is preferable to record a plurality of dummy data larger than a block in one or more logical blocks, and replace only the dummy data included in a predetermined logical block with audio data at the time of post-recording. This is because the same effect can be expected even when the size of the dummy packet is not an integral multiple of the size of the logical block.

Next, in order to achieve the above object, an AV data recording method according to the present invention controls a step of writing data to a logical block on a disk and a step of reading data recorded in the logical block to delete the data. When a part of the data recorded as one file on a plurality of logical blocks is deleted, the data in the valid data area before the deleted area reaches the boundary of the logical block. Packets continue in front of the valid data area behind the deleted area, from the first half where a dummy packet is added after the previous valid data area, and from the boundary of the logical block to the start point of the valid data area behind the deleted area. And the latter half to which the dummy packet is added is handled as one file.

With this configuration, it is not necessary to perform any leading-justification processing on the valid data after the deletion area, so that the processing load can be greatly reduced.

Next, in order to achieve the above object, an AV data recording method according to the present invention controls a step of writing data to a logical block on a disk and a step of reading data recorded in the logical block to delete the data. When the front part of the data recorded as one file on a plurality of logical blocks is deleted as a deletion area and the rear part is left as a valid data area, the logical part before the end of the deletion area is deleted. From the block boundary to the end of the valid data area, data in which a dummy packet is added so that packets continue in front of the valid data area and the valid data area are handled as one file.

も According to such a configuration, it is not necessary to perform the justification process on the valid data after the deletion area, so that the processing efficiency can be greatly improved.

Next, in order to achieve the above object, an AV data recording method according to the present invention includes a step of writing data to a logical block on a disk, and a step of writing management information of the written data to the logical block. In the step of writing the management information, the management information of the data including the start position of the data on the logical block, the length of the data, and the identification of the logical block in which the data is written is written.

With such a configuration, the degree of freedom of the linkable area is increased by the data management information, so that the writable area can be managed only by the pointer processing without performing the justification processing or the dummy data embedding processing, and the standard conformity can be achieved. The processing load for securing can be reduced.

Next, in order to achieve the above object, an AV data recording method according to the present invention controls a step of writing data to a logical block on a disk and a step of reading data recorded in the logical block to delete the data. In the data writing step, data management information including the start position of data on the logical block, the data length, and the identification of the logical block in which the data was written is separately written, and the data is deleted. When a part of the data recorded as one file on a plurality of logical blocks is deleted in the step of performing, the effective data area before the deletion area and the effective data area after the deletion area are stored in two areas. It is divided, and two areas are treated as one file.

With this configuration, the degree of freedom of the linkable area is increased by the data management information, and the new writable area can be managed only by the pointer processing without performing the front-justification processing or the dummy data embedding processing at the time of data deletion. As a result, it is possible to reduce the processing load for ensuring standard conformity.

In the AV data recording method according to the present invention, it is preferable that a DIT packet conforming to the DVB standard is further inserted and recorded between the valid data area before the deletion area and the valid data area after the deletion area. This is because the DIT packet can be used as a trigger to detect that the stream of the valid data area after the deletion area is a new stream that is discontinuous from the stream of the valid data area before the deletion area.

Next, in order to achieve the above object, an AV data recording method according to the present invention divides an audio signal and a video signal into transport packets and repeats a set of transport packets and transmission timing information for each transport packet. Assembling a transport stream with transmission timing information, and a step of recording the transport stream with transmission timing information, and managing whether or not a logical block on the disk is used; Detecting a continuous data area that guarantees real-time continuous reproduction of the video signal; and indicating a logical block number of the continuous data area in which a transport stream with transmission timing information is to be recorded. Multiple continuous data detected by the Characterized by continuously recording the transport stream with the transmission timing information on data area.

With this configuration, it is possible to output via the 1394 interface only by simple timing adjustment without newly generating output timing.

The AV data recording method according to the present invention divides an audio signal and a video signal into transport packets, and repeatedly arranges a plurality of transport packets for a predetermined time length and transmission timing information for each transport packet. It is preferable to construct a transport stream by arranging the unit packets and arranging the unit packets. This is for efficient recording in a more manageable form.

In the AV data recording method according to the present invention, it is preferable to assemble a transport stream including transport packets conforming to digital broadcasting using MPEG. This is because digital broadcasting standards using MPEG can be utilized.

In addition, in order to achieve the above object, the AV data recording method according to the present invention preferably includes a 27 MHz counter value as transmission timing information. Further, it is preferable that the AV data recording method according to the present invention include a counter value of 24.576 MHz as transmission timing information. At 27 MHz, a clock or the like used for video recording / reproduction can be used, and at 24.576 MHz, the output clock can be easily adjusted because it matches the reference clock of the 1394 interface.

Next, in order to achieve the above object, an AV data recording method according to the present invention includes a step of receiving a transport stream in real time from a communication channel and a step of recording the transport stream. For managing whether or not the transport stream is used, detecting a continuous data area that guarantees real-time continuous playback of the transport stream, and indicating a logical block number of the continuous data area where the transport stream is to be recorded. And recording the transport stream continuously on the plurality of detected continuous data areas.

With this configuration, even in the case of real-time input via the 1394 interface, there is no need to perform special stream conversion processing, so that video recording can be easily realized. At the same time, it is possible to reduce the useless area in the recording area and to perform efficient recording. Further, at the time of reproduction, continuous reproduction can be guaranteed. Further, it is possible to efficiently realize that a stream is compliant with the MPEG standard when connected to a personal computer.

Next, in order to achieve the above object, an AV data recording method according to the present invention includes a step of receiving a transport stream in real time from a communication channel, and a step of adding a set of transport packets and reception timing information to the transmission timing information. Recording a transport stream as a transport stream, and managing whether or not a logical block on the disk is used, and a continuous data area that guarantees real-time continuous playback of the transport stream with transmission timing information. Detecting the transport stream with the transmission timing information, further comprising the step of indicating the logical block number of the continuous data area in which the transport stream with the transmission timing information is to be recorded, the transport stream with the transmission timing information on the plurality of detected continuous data areas. Characterized by continuous recording .

With this configuration, even when transmission timing information is added to real-time input via the 1394 interface, there is no need to perform special stream conversion processing, and video recording can be easily realized. Further, at the time of reproduction, continuous reproduction can be guaranteed. Further, it is possible to efficiently realize that a stream is compliant with the MPEG standard when connected to a personal computer.

Next, in order to achieve the above object, an AV data reproducing method according to the present invention comprises the steps of: reading a transport stream recorded on a postponed disc from a disc recorded by the above-described AV data recording method; The method includes a step of calculating a transmission timing of a transport stream according to a standard, and a step of transmitting a transport packet to a 1394 transmission line, and transmitting a transport packet to the 1394 transmission line according to the calculated transmission timing.

構成 With this configuration, real-time playback via the 1394 interface can be guaranteed.

Next, in order to achieve the above object, an AV data reproducing method according to the present invention comprises a step of reading a transport stream with transmission timing information recorded on a disc recorded by the above-described AV data recording method. And a step of reproducing the transmission timing according to the transmission timing information of the transport stream with the transmission timing information, and a step of transmitting the transport packet to the 1394 transmission path, and transmitting the transport packet to the 1394 transmission path according to the reproduced transmission timing. It is characterized by sending.

With this configuration, real-time reproduction via the 1394 interface can be realized using the transport stream with transmission timing information.

As described above, according to the AV data recording apparatus of the present invention, the video is recorded so as to be easily transmitted to the D-VHS or the set-top box (STB) via the IEEE1394 digital interface and to be capable of continuous reproduction. An AV data recording / reproducing device that realizes a video recording / reproducing device, and at the same time, reduces the waste of storage capacity and can easily show an MPEG system stream recorded when connected to a personal computer as data conforming to the MPEG standard. Can be realized.

Further, according to the AV data recording apparatus of the present invention, after deleting a VOBU in the middle of an MPEG system stream, connecting the subsequent VOBUs to enable management within the AV data recording / reproducing apparatus as one stream, The amount of calculation processing can be significantly reduced.

{Circle around (4)} The amount of arithmetic processing in the post-recording processing of the MPEG system stream can be significantly reduced.

As described above, it is possible to easily realize an AV data recording apparatus having various functions (continuous reproduction, digital transmission, file operation, partial deletion, and post-recording) for recorded images.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of the AV data recording apparatus according to the first embodiment of the present invention. In FIG. 1, signals input from a video signal input unit 1 and an audio signal input unit 2 are compressed by a video compression unit 3 and an audio compression unit 4, respectively, formed into a transport stream by a transport stream assembling unit 5, and recorded. The data is written to the phase change optical disk 8 via the unit 6 and the pickup 7.

When a video signal is input and recorded via the 1394 interface, a transport stream format video signal input from the outside to the 1394 interface unit 9 is transferred to the phase change optical disk 8 via the recording unit 6 and the pickup 7. Record.

(4) When recording a video signal, the recording control section 61 controls the recording section 6. Further, the recording control unit 61 causes the continuous data area detection unit 62 to detect a physically continuous free area. The continuous data area detection unit 62 checks the use status of each logical block (and sector) managed by the logical block management unit 63 and detects a free area.

Specifically, by the recording start operation, the transport stream assembling unit 5 converts the compressed video signal and the compressed audio signal into transport packets V_TSP and A_TSP (video transport in which video data is stored) in units of 188 bytes. The packet is divided into a packet V_TSP and an audio transport packet A_TSP in which audio data is stored. The two types of transport packets are arranged in order so as to form one VOBU, and then passed to the recording unit 6.

(4) The recording unit 6 starts recording the VOBU from the position of the logical block number specified by the recording control unit 61. At this time, in the recording unit 6, one VOBU is divided in units of 32 Kbytes, and an error correction code is added in units of 32 Kbytes, and is recorded as one logical block on the phase-change optical disc 8.

(4) When recording of one VOBU is completed in the middle of one logical block, recording of the next VOBU is continuously performed without leaving a gap.

On the other hand, by the continuous data area detecting section 62, a continuous free logical block area of 11 seconds or more is detected in advance by calculation of the maximum recording / reproducing rate before the recording in the recording section 6 is started. Then, the logical block number is notified to the recording unit 6 every time writing in the logical block unit occurs, and the logical block management unit 63 is notified that the logical block has been used.

The continuous data area detection unit 62 searches the usage status of the logical block managed in the logical block management unit, and detects an area where the unused logical block is continuous for 11 seconds in terms of the maximum recording / reproducing rate. Keep it. The data reading rate of the reproducing section, the maximum data recording / reproducing rate (video recording / reproducing rate), and the maximum moving time of the pickup are the same as those in the conventional example.

{Also, in order to guarantee continuous reproduction, a continuous free logical block area of 11 seconds or more is always detected, but the method is not particularly limited to this, and other methods are also conceivable.

For example, the data size of consecutive free logical blocks may be dynamically determined while calculating and tracing the amount of storage of excess reproduced data. That is, when a continuous data area for 17 seconds can be secured at a certain point during shooting, a continuous recording method that secures a continuous data area for 5 seconds is also considered.

The logical block management unit 63 manages the usage status of each logical block number based on the used logical block number notified from the recording control unit 61. That is, the usage status of each sector unit constituting the logical block number is recorded by using the space bit descriptor area defined by the UDF or the file configuration of ISO / IEC 13346 to determine whether the sector is used or unused. Will be managed. Then, in the final stage of the recording process, the FID and the file entry are written in the file management area on the disk.

FIG. 2 is a diagram showing a recording form in the AV data recording apparatus according to the first embodiment of the present invention. In FIG. 2, the MPEG system stream is composed of a plurality of VOBUs that are continuous without gaps, and one VOBU is composed of MPEG transport packets that are continuous without gaps corresponding to 0.4 to 1 second of recorded content. I have.

There are two types of transport packets, a video transport packet (V_TSP) storing video data and an audio transport packet (A_TSP) storing audio data. Each transport packet has a length of 188 bytes. It is. V_TSP includes a transport packet header and video data, and A_TSP includes a transport packet header and audio data. The difference between V_TSP and A_TSP is identified by a PID (Packet ID) in the transport packet header, V_TSP is identified by PID = "0x0020", and A_TSP is identified by PID = "0x0021". The relationship between one VOBU and a continuous data area, a logical block, and a sector is the same as in FIG.

On the other hand, when reproducing the recorded data, as shown in FIG. 3, the transport stream extracted via the pickup 7 and the reproducing unit 31 is separated into a video signal and an audio signal by the transport stream decomposing unit 32. Are output to the video display unit 35 and the audio output unit 36 via the video decompression unit 33 and the audio decompression unit 34, respectively.

When a set-top box (STB) is connected to the 1394 interface and the recorded video is transmitted to the set-top box and played back on the set-top box side, the transport stream output from the playback unit 31 is directly output timing. The data is passed to the 1394 interface unit 9 via the generation unit 13.

Here, the output timing generation unit 13 performs scheduling so that the transmission timing of each transport packet conforms to a decoder model (Transport stream system target decoder) of the MPEG standard, and generates each transport packet at that timing. Hand over to 9.

Then, the 1394 interface unit 9 transmits the transport packet to the 1394 transmission line while maintaining the time interval between the packets when the transport packet is received. Note that, in the decoder model of the MPEG standard, the transport packet is determined to be transmitted such that the buffer memory for receiving the transport packet on the set-top box does not overflow or underflow.

In both cases of displaying the recorded data on the video display unit 35 and reproducing the data on the set-top box via the 1394 interface unit 9, the transport stream is designated by the continuous data area detection unit 62. Since the data is recorded in the designated area, continuous reproduction can be guaranteed.

As described above, according to the first embodiment, there is no need to perform a special stream conversion process when using the 1394 interface, to perform recording with guaranteed continuous reproduction, to have no useless area in the recording area, And as a data file that complies with the MPEG standard when connected to a personal computer, guarantees real-time recording / real-time playback using synchronous transfer means for video via a digital interface, and plays back files using asynchronous transfer means when connected to a personal computer Guarantee compatibility can be easily and efficiently realized.

When deleting a recorded video signal file or the like, the deletion control unit 64 controls the recording unit 6 and the reproduction unit 31 to execute a deletion process. Further, when performing the after-recording, the after-recording control unit 65 controls the recording unit 6 and the reproducing unit 31 to complete the after-recording process. In addition, when performing post-recording after recording, it is necessary to perform video recording while activating the post-recording dummy packet generation unit 10 in advance. In addition, when actually performing the deletion processing and the post-recording processing, it is necessary to activate a reproduction function (for example, a reproduction unit) or the like in order to read the data of the logical block.

In the first embodiment, a transport stream is recorded. However, a PES stream composed of PES packets having an arbitrary packet length as shown in FIG. 35 may be used.

However, when recording a PES stream, PES / TS conversion and TS / PES conversion are required when performing input / output via the 1394 interface. Such a conversion process is required for a program stream. Processing is lighter than PS / TS conversion and TS / PS conversion. This is because PS / TS conversion and TS / PS conversion are equivalent to PS / PES / TS conversion and TS / PES / PS conversion, respectively. Further, a PES stream assembling unit and a disassembling unit are required instead of the transport stream assembling unit and the disassembling unit.

In the first embodiment, audio is described as being compressed, but there is no particular problem if the audio is incorporated into the system stream in an uncompressed form.

In the first embodiment, the digital interface is described as a transmission path conforming to the 1394 standard. However, the present invention is not limited to this, and it is sufficient that the digital interface has a synchronous transfer and an asynchronous transfer of MPEG data.

(Embodiment 2)
Next, a case where the user deletes a specific VOBU of a video that has already been recorded will be described. FIG. 4 is a diagram illustrating contents recorded before a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. In FIG. 4, data is recorded over logical blocks # 5000 to 5999, and VOBU # 0 to VOBU # 85 are recorded in the logical blocks. Here, the entire recorded logical block is called an area a. In addition, the user plays back the recorded video to designate VOBU # 51 as a portion to be deleted, and VOBU # 51 to be deleted is recorded over logical blocks # 5500, # 5501, and # 5502.

FIG. 5 is a diagram showing contents recorded after a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. FIG. 5 shows that although the logical blocks # 5000 to # 5500 and # 5502 to # 5999 are recorded, the logical block # 5501 is an empty area (unused). Also, VOBU # 0 to # 50 and VOBU # 52 to # 85 are recorded in the logical block, indicating that VOBU # 51 has been deleted from the recorded contents. Here, the video data portion of logical blocks # 5000 to # 5500 is referred to as region A, the video data portion of logical block # 5502 is referred to as region B, and the video data portions of logical blocks # 5503 to # 5999 are referred to as region C.

FIG. 6 is a diagram showing a structure of a file recorded before a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. The content (logical blocks # 5000 to # 5999) recorded in the area a in FIG. 4 is linked to the file entry by one allocation descriptor.

FIG. 7 is a diagram showing a structure of a file recorded after a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. This indicates that the recorded contents of the areas A, B, and C in FIG. 5 are linked to one file entry by three allocation descriptors.

FIG. 8 is a diagram showing numerical values related to an allocation descriptor of a file entry before a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. Here, the extended allocation pointer of FIG. 30B is used as the allocation descriptor. The extent position indicates the head sector number of the area a in FIG. 4, and indicates the sector number “80000” corresponding to the logical block # 5000. The record length and the extent length indicate 32766144 bytes as the data length of the file. Also, since each allocation descriptor is 20 bytes, the allocation descriptor length is "20". In the second embodiment, since the data is not compressed, the information length uses the same value as the record length, and the usable area is not used. Therefore, description of these fields will be omitted.

FIG. 9 is a diagram showing numerical values related to an allocation descriptor of a file entry after a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. Here, the extended allocation pointer shown in FIG. 30B is used as the allocation descriptor. The extent positions of the allocation descriptors A, B, and C indicate the start sector numbers of the areas A, B, and C in FIG. 5, and the sector numbers “80000” and “88032” corresponding to the logical blocks # 5000, # 5502, and # 5503. , "88048". The record lengths of the allocation descriptors A, B, and C indicate the effective data length, which are 16383072 bytes, 16544 bytes, and 16299600 bytes, respectively. The extent positions of the allocation descriptors A and B indicate a range including valid data by a length that is an integral multiple of 2048 bytes, and are 16384000 bytes and 18432 bytes, respectively. On the other hand, the extent position of the allocation descriptor C does not need to be an integral multiple of 2048 bytes according to the standard, and is therefore 16299600 bytes, which is the same as the record length. Further, since three allocation descriptors are used, the length of the allocation descriptor is “60”.

Next, the flow of processing in the deletion processing unit 64 will be described. FIG. 10 is a flowchart of the processing of the deletion processing unit in the AV data recording device according to the second embodiment of the present invention. FIG. 10 illustrates a case in which the user views a reproduced image, instructs to delete a specific portion, and deletes the corresponding VOBU # 51 in FIG. Of the data of VOBU # 52, only the data written in logical block # 5502 is rewritten with the left justified to start from the beginning of logical block # 5502 (step S101). This leading portion is referred to as a region B.

Next, the file entry is changed as shown in FIGS. 7 and 9 (steps S102 to S104). First, in the allocation descriptor A of FIG. 7, the recorded content starts from the logical block # 5000 (sector # 80000), the effective data size (record length) is 163833072 bytes, and the data size (extent length) in units of 2048 bytes including the effective data ) Indicates 16384000 bytes. The allocation descriptor B starts with logical block # 5502 (sector # 88032), has an effective data size (record length) of 16544 bytes, and has a data size (extent length) of 2048 bytes including effective data of 18432 bytes. Is shown. The allocation descriptor C starts from the logical block # 5503 (sector # 88048), and indicates that the effective data size (record length) and the extent length are 16299600 bytes. Finally, the logical block management unit is notified that the logical block # 5501 has become free (step S105). This completes the deletion process.

As described above, according to the second embodiment, the justification processing is performed only for one logical block, and the deletion processing is completed by the addition and change processing of the allocation descriptor. As described above, since the entire area C does not need to be left-justified, the processing load on the deletion processing unit 64 is significantly reduced. Further, either the VOBUs are arranged continuously as in the first embodiment, or some VOBUs are intermittently arranged with respect to the logical block as in the second embodiment. Real-time recording / real-time reproduction of video via the 1394 interface before deletion processing, file reproduction when a personal computer is connected, and partial deletion processing can be easily and efficiently realized.

In the playback after the deletion processing, for example, when skipping from area A to area B, separate MPEG buffer control may be required before skipping in order to guarantee continuous playback.

In the second embodiment, the description has been given on the assumption that the deletion area that can be specified by the user is in VOBU units. However, the present invention is not particularly limited to this. For example, the deletion area may be in frame units. However, in that case, only the VOBU that is entirely contained in the deletion area specified by the user is deleted. For a VOBU partially including a deletion area, processing such as shortening the VOBU by deleting unnecessary frames by editing, or controlling not to reproduce the frame included in the deletion area without deleting the VOBU. Is required.

(4) The deletion area that can be specified by the user may be a field unit. However, in this case, only the VOBU completely included in the deletion area specified by the user is deleted. A VOBU that partially includes a deletion area may delete unnecessary frames by editing to shorten the VOBU and prevent a specific field from being reproduced, or may not delete the VOBU and delete a field included in the deletion area. Processing such as control not to reproduce is required.

In the second embodiment, the VOBU is composed of transport packets. However, the VOBU may be composed of packs of program streams of any length.

In the second embodiment, the VOBU is composed of a transport stream, but may be a PES stream composed of PES packets having an arbitrary packet length. Furthermore, a unique format stream composed of unique format packets may be used.

(Embodiment 3)
Next, a case in which the user records video data so that the user can perform post-recording will be described. FIG. 11 is a diagram illustrating a recording form in the AV data recording apparatus according to the third embodiment of the present invention. In FIG. 11, one VOBU includes a dummy packet (hereinafter, referred to as “D_TSP”) and a null transport packet (hereinafter, referred to as “D_TSP”) for storing the back audio during after-recording, in addition to V_TSP and A_TSP similar to those in the first embodiment. N_TSP). D_TSP is identified by PID = "0x0022", and N_TSP is identified by PID = "0x1FFF". In addition, audio is specified in advance as the stream type (stream type field of the transport packet header) of the data stored in the D_TSP during video recording.

Here, assuming that the peak rate of the back audio to be dubbed is slightly less than 512 kbps (including the transport header) for 2 ch, the data size equivalent to 1 second is less than 2 logical blocks.

When recording video data so that post-recording can be performed, for example, in one VOBU #I shown in FIG. 11, an N_TSP is arranged at the boundary between the logical block # (i-1) and the logical block #i, and the logical block # N_TSP is arranged at the boundary between (i + 1) and logical block # (i + 2), and the space between both is filled with D_TSP equivalent to approximately 512 Kbps. Similarly, a D_TSP sandwiched between N_TSPs is placed in each VOBU. The write position of D_TSP is determined so as to be after the first logical block in the VOBU. This makes it possible to specify the position of the D_TSP without reading the logical block including the D_TSP.

When recording the back audio during the post-recording, the A_TSP which is the audio transport packet of the back audio is recorded in the physical position of the D_TSP while displaying the video recorded in each VOBU without audio. At this time, since the writing position of the back audio recording is closed in the logical block, the processing of writing the audio data is sufficient. That is, since there is no possibility that an RMW occurs, processing can be performed at a higher speed than in the conventional case.

再生 When reproducing a video in synchronization with the back audio, the V_TSP and A_TSP with PID = "0x0022" may be reproduced.

As described above, according to the third embodiment, it is possible to remarkably reduce the processing amount in the back-audio recording at the time of post-recording, and to easily realize the post-recording function.

In the third embodiment, recording based on a transport stream is assumed, but a program stream including packs may be used. In this case, a dummy pack whose total is the size of the logical block is recorded for the logical block as a dummy packet.

In the third embodiment, the position of the D_TSP is set after the logical block whose head is first included in the VOBU, but there is no problem even after the second VOBU. Further, the start position of D_TSP may be arbitrary. In the third embodiment, the stream type of D_TSP is audio, but may be private data.

In the third embodiment, D_TSP is PID = “0x0022” during video recording on the premise of post-recording, but may be a value between “0x0002” and “0x1FFF”. . However, in the case of “0x1FFF”, it is necessary to assign a PID between “0x0002” and “0x1FFE” at the time of post-recording.

{Furthermore, in the third embodiment, recording using a transport stream is premised, but a PES stream composed of PES packets having an arbitrary packet length may be used. In the case of recording using a PES stream, dummy PES packets having a total size equal to or larger than the logical block size are recorded as the dummy packets for the logical block. The PES packet of the frontal voice and the dummy PES packet can be identified by changing the stream ID of the PES.

(Embodiment 4)
Next, a case where the user deletes a specific VOBU of a video that has already been recorded will be described. FIG. 12 is a diagram showing contents recorded before a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. In FIG. 12, VOBU # 0 to VOBU # 85 are recorded over logical blocks # 5000 to 5999. Here, the entire recorded VOBU is called area a, and the data size is 32766144 bytes. Further, the user designates VOBU # 51 as a portion to be deleted while reproducing the recorded video, and VOBU # 51 to be deleted is recorded over logical blocks # 5500, # 5501, # 5502, and # 5503. I have.

FIGS. 13 to 16 show the contents recorded after the delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. 13 to 16, N_TSP indicates a null transport packet.

First, in FIG. 13, although VOBUs are recorded in the logical blocks # 5000 to # 5500 and # 5503 to # 5999, the fact that the logical blocks # 5501 and # 5502 have become empty areas (unused). Is shown. That is, one of VOBU # 0 to VOBU # 50 and VOBU # 52 to # 85 is recorded in each logical block, and VOBU # 51 is deleted from the recorded contents. The data size from the beginning of VOBU # 0 to the end of VOBU # 50 is referred to as sizeA, and the data size from the beginning of VOBU # 0 to the end of VOBU # 51 before deletion is referred to as sizeB. Further, null transport packets (N_TSPs) are arranged after VOBU # 50 and before VOBU # 52. At this time, an area obtained by adding N_TSPs from the rear to the data area before the deletion area is called an area A, and an area obtained by adding N_TSPs from the front to the data area after the deletion area is called an area B. It is assumed that the data size from the beginning of VOBU # 0 to the end of VOBU # 50 is 16406760 bytes.

Next, FIG. 14 shows an example of deletion when the size of the deleted VOBU # 51 is 100016 bytes, and FIG. 15 shows an example of deletion when the size of the deleted VOBU # 51 is 80088 bytes. 14 and 15, addA indicates the data size of N_TSPs attached after VOBU # 50, and addB indicates the data size of N_TSPs attached before VOBU # 52.

X and Y are numerical values related to the boundary of the unit of 94 kilobytes (94 × 1024 bytes) counted from the head of the data before deletion. X is the data size from the last 94 kilobyte boundary in the data part before the deletion area to the end of the null transport packet addition part, and Y is 94 one byte before the first 94 kilobyte boundary in the data part after the deletion area. The data size from the kilobyte boundary to the beginning of the area B is shown.

FIG. 14 shows a case where Y ≧ X, and FIG. 15 shows a case where Y <X. The size of 94 kilobytes (94 × 1024 bytes) is the least common multiple of 188 bytes of the transport packet size and 2048 bytes of the sector size.

FIG. 16 shows a continuous state of the transport packets in the area A and the area B.

FIG. 16 is a diagram showing a structure of a file recorded before a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. This indicates that the contents (logical blocks # 5000 to # 5999) recorded in the area a in FIG. 12 are linked to the file entry by one allocation descriptor.

FIG. 17 is a diagram showing a structure of a file recorded after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. It shows that the recorded contents of the areas A and B in FIG. 14 or FIG. 15 are linked to one file entry by two allocation descriptors.

FIG. 18 is a diagram showing numerical values related to an allocation descriptor of a file entry before a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. Here, the short allocation pointer shown in FIG. 30A is used as the allocation descriptor. The extent position indicates the head sector number of the area a in FIG. 12, and indicates the sector number “80000” corresponding to the logical block # 5000. The extent length indicating the effective data length indicates 32766144 bytes. Also, since each allocation descriptor is 8 bytes, the length of the allocation descriptor is "8".

FIG. 19 is a diagram showing numerical values related to an allocation descriptor of a file entry after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. Here, the short allocation pointer shown in FIG. 30A is used as the allocation descriptor. The extent positions of the allocation descriptors A and B indicate the first sector numbers of the areas A and B in FIG. 14, and correspond to the first sector (first sector) in the logical block # 5000 and the twelfth sector in # 5503. The numbers “80000” and “88059” are shown. The extent lengths of the allocation descriptors A and B indicate the effective data length, which are 16406760 bytes and 1626112 bytes. Further, since two allocation descriptors are used, the allocation descriptor length is "16".

Add The addA of the area A and the addB of the area B are derived according to the following equations (Equation 1) and (Equation 2). First, (Equation 1) is an expression for deriving addA of the area A.

　次に、（数２）は領域ＢのaddＢを導出する式である。

Next, (Equation 2) is an expression for deriving addB of the area B.

　なお、addＢの導出式は、Ｙ≧Ｘの場合とＹ＜Ｘの場合とで相異する。また、（数１）及び（数２）において、modularは除算の余り値を意味し、roundは除算結果の小数点以下を切り捨てた値を意味する。

Note that the formula for deriving addB is different between Y ≧ X and Y <X. Further, in (Equation 1) and (Equation 2), “modular” means a remainder value of division, and “round” means a value obtained by truncating a decimal part of a division result.

The flow of the process in the deletion processing unit 64 will be described. FIG. 20 is a flowchart of the processing of the deletion processing unit in the AV data recording device according to the fourth embodiment of the present invention. FIG. 20 illustrates a case in which the user views a reproduced image to instruct a specific portion to be deleted and deletes the corresponding VOBU # 51 in FIG. First, an area A is constructed by adding a null transport packet by the size addA after VOBU # 50 (step S201). As a result, the data size of the area A becomes an integral multiple of 2048 bytes. Next, a null transport packet is added by addB before VOBU # 52 to construct an area B (step S202). Here, it is assumed that the null transport packets in the area A and the area B are continuous.

Thereby, the data start address of the area B becomes an integral multiple of 2048 bytes when counting from the beginning of VOBU # 0 except for VOBU # 51. As described above, since the end of the area A and the start of the area B are on the boundary of 2048 bytes, the condition of the short allocation pointer of the UDF is satisfied. Further, when the area A and the area B are connected, a transport packet of 188 bytes is continuously arranged. This is shown in FIG.

Here, as shown in FIG. 14, when the data size of VOBU # 51 is, for example, 100016 bytes, a null transport packet of X = 45056, Y = 47000, Y ≧ X, and addA = 1816 bytes and addB = 1944 bytes Will be added.

On the other hand, as shown in FIG. 15, when the data size of VOBU # 51 is, for example, 80088 bytes, X = 45056, Y = 27072, Y <X, and null transport packets of addA = 1816 bytes and addB = 78272 bytes Will be added.

Next, the file entry is changed as shown in FIGS. 17 and 19 (steps S203 to S204). However, the numerical values shown in FIG. 19 show the case of FIG. The allocation descriptor A in FIG. 17 indicates that the recorded content starts from the first sector (sector # 80000) of the logical block # 5000 and has a data size of 16408576 bytes. The allocation descriptor B starts from the twelfth sector (sector # 88059) of the logical block # 5503, and indicates that the data size is 16261312 bytes. Finally, the logical block management unit is notified that the logical blocks # 5501 and # 5502 are free (step S205). This completes the deletion process.

As described above, according to the fourth embodiment, the deletion process is completed by the null transport packet addition process and the allocation descriptor addition change process. As described above, the entire area behind the deletion area does not need to be left-justified, so that the processing load on the deletion processing unit 64 is significantly reduced. Further, either the VOBUs are continuously arranged as in the first embodiment, or the VOBUs are continuously arranged while inserting null packets between the VOBUs as in the fourth embodiment, Real-time recording / real-time reproduction of video via the 1394 interface before deletion processing, file reproduction when a personal computer is connected, and partial deletion processing can be easily and efficiently realized.

In the playback after the deletion processing, for example, when skipping from area A to area B, separate MPEG buffer control may be required before skipping in order to guarantee continuous playback.

In the fourth embodiment, the description has been given on the assumption that the deletion area that can be specified by the user is in units of VOBUs. However, the present invention is not limited to this, and may be in units of frames, for example. However, in that case, only the VOBU completely included in the deletion area specified by the user is deleted. For a VOBU partially including a deletion area, processing such as shortening the VOBU by deleting unnecessary frames by editing, or controlling not to reproduce the frame included in the deletion area without deleting the VOBU. Is required.

(4) The deletion area that can be specified by the user may be a field unit. However, in this case, only the VOBU completely included in the deletion area specified by the user is deleted. A VOBU that partially includes a deletion area may delete unnecessary frames by editing to shorten the VOBU and prevent a specific field from being reproduced, or may not delete the VOBU and delete a field included in the deletion area. Processing such as control not to reproduce is required.

In the fourth embodiment, the VOBU is composed of transport packets, but may be composed of packs of program streams in units of 2 Kbytes. However, in this case, the process of adding a null packet in FIG. 20 becomes unnecessary.

In the fourth embodiment, the VOBU is composed of a transport stream, but may be a PES packet having an arbitrary packet length or a PES stream composed of a pack of a program stream. Furthermore, a unique format stream composed of unique format packets may be used. However, in these cases, it is necessary to use a packet having a stream ID not used as a dummy packet or a private stream ID.

In the fourth embodiment, the end position of the area A matches the boundary of 2 kilobytes, but may match the boundary of the logical block size (32 kilobytes).

(Embodiment 5)
Another example in which the user deletes a specific VOBU of an already recorded video will be described.

FIG. 21B shows the data structure of the allocation pointer of the file entry according to the fifth embodiment. As shown in FIG. It manages an extent offset indicating the size up to the data start address, and a record length indicating the actual valid data size. In the fifth embodiment, when recording a video, an allocation descriptor having such a data structure is recorded in a file entry.

FIG. 22 is a diagram showing the contents recorded before the delete operation in the AV data recording apparatus according to the fifth embodiment. In FIG. 22, VOBU # 0 to VOBU # 85 are recorded over logical blocks # 5000 to 5999. Here, it is assumed that the recorded data size is 32766144 bytes. In addition, the user designates VOBU # 51 as a portion to be deleted while reproducing the recorded video, and VOBU # 51 to be deleted is recorded over logical blocks # 5500, # 5501, # 5502, and # 5503. I have. The entire VOBU is called an area a, the area from the head of the VOBU to VOBU # 50 is called an area A, and the area from VOBU # 52 onward to the end of the VOBU is called an area B. The data size from the beginning of VOBU # 0 to the end of VOBU # 50 is 16406760 bytes, and the data size of VOBU # 51 is 100016 bytes.

FIG. 23 is a diagram showing a structure of a file recorded after a delete operation in the AV data recording apparatus according to the fifth embodiment of the present invention. This shows that the recorded contents of the areas A and B shown in FIG. 22 are linked (associated) to one file entry by two allocation descriptors.

FIG. 24 is a diagram showing numerical values related to an allocation descriptor of a file entry before a delete operation in the AV data recording apparatus according to the fifth embodiment of the present invention. Here, the allocation pointer shown in FIG. 21 is used as the allocation descriptor. The extent position indicates the head sector number of the recorded data, and indicates the sector number “80000” corresponding to the logical block # 5000. Also, since the data is recorded from the beginning of sector # 80000, the extent offset indicates 0 bytes, and the record length indicating the effective data length indicates 32766144 bytes. Also, since each allocation descriptor is 12 bytes, the allocation descriptor length is "12".

FIG. 25 is a diagram showing numerical values related to an allocation descriptor of a file entry after a delete operation in the AV data recording apparatus according to the fifth embodiment of the present invention. Here, the allocation pointer shown in FIG. 21 is used as the allocation descriptor. The extent positions of the allocation descriptors A and B indicate the head sector numbers of the areas A and B in FIG. 23, respectively, and correspond to the head sector (first sector) in the logical block # 5000 and the twelfth sector in # 5503, respectively. The sector numbers “80000” and “88059” are shown. The record length of the allocation descriptors A and B indicates the effective data length, which is 16406760 bytes and 16259368 bytes.

"Also, the extent offset of the allocation descriptor A is set to" 0 "because the area A starts from the head of the sector. As the extent offset of the allocation descriptor B, "1944" is set since the area B starts from the 1944 byte of the sector # 88059 or later. Further, since two allocation descriptors are used, the length of the allocation descriptor is “24”.

A description will be given of the flow of processing in the deletion processing unit 64 according to the fifth embodiment. FIG. 26 is a flowchart of the process of the deletion processing unit in the AV data recording device according to the fifth embodiment of the present invention. 26, a case will be described in which the user views a reproduced image, instructs to delete a specific portion, and deletes the corresponding VOBU # 51 in FIG. For this reason, the allocation descriptor, which has pointed to the area a as shown in FIG. 24, is changed to point to the area A (S301). Next, an allocation descriptor pointing to the area B is added (S302). As a result, the file entry in FIG. 24 becomes the file entry shown in FIG. 23 and FIG. The allocation descriptor according to the fifth embodiment does not need to store data from the head of a sector by a combination of an extent offset and a record length. This eliminates the need for the justification process of the second embodiment and the additional process of the null packet of the fourth embodiment. Finally, the logical block management unit is notified that the logical blocks # 5501 and # 5502 are free (step S303). This completes the deletion process.

As described above, according to the fifth embodiment, the deletion process is completed by the process of adding and changing the allocation descriptor. As a result, it is not necessary to shift the entire area behind the deletion area to the front, so that the processing load on the deletion processing unit 64 is significantly reduced.

In the playback after the deletion processing, for example, when skipping from area A to area B, separate MPEG buffer control may be required before skipping in order to guarantee continuous playback.

In the fifth embodiment, the description has been given on the assumption that the deletion area that can be specified by the user is in units of VOBUs. However, the present invention is not limited to this, and may be in units of frames, for example. However, in that case, only the VOBU completely included in the deletion area specified by the user is deleted. For a VOBU partially including a deletion area, processing such as shortening the VOBU by deleting unnecessary frames by editing, or controlling not to reproduce the frame included in the deletion area without deleting the VOBU. Is required.

(4) The deletion area that can be specified by the user may be a field unit. However, in this case, only the VOBU completely included in the deletion area specified by the user is deleted. A VOBU that partially includes a deletion area may delete unnecessary frames by editing to shorten the VOBU and prevent a specific field from being reproduced, or may not delete the VOBU and delete a field included in the deletion area. Processing such as control not to reproduce is required.

In the fifth embodiment, the VOBU is composed of a transport stream, but may be a PES packet having an arbitrary packet length or a PES stream composed of a pack of a program stream. Furthermore, a unique format stream composed of unique format packets may be used.

In the second, third, fourth and fifth embodiments, a transport stream is assumed, but a system stream of MPEG1 or MPEG4 may be used. Further, it may be in a Motion-JPEG compression format or a QuickTime file format.

In the third, fourth and fifth embodiments, the case where the N_TSP is inserted between the area A and the area B or the file is partially deleted by updating the allocation pointer has been described. A DIT (Discontinuity Information Table) packet defined by the European DVB (Digital Video Broadcasting) standard or the Japanese BS digital broadcasting standard may be further inserted between them.

Here, the DIT packet is a transport packet of PID = 0x001E, and includes parameters (Continuity Counter and Program Clock Reference) in the transport header and MPEG buffer control (VBV buffer control of video, buffer control of audio, etc.) before and after. Is discontinuous. The DVB standard and the BS digital broadcasting standard specify the insertion of this packet when transmitting a transport stream.

Inserting such a DIT packet at the time of partial deletion of a file to perform real-time reproduction of the file after partial deletion via the 1394 interface, or reproduction of a file using MPEG reproduction software on a personal computer when a personal computer is connected Further, the data following the area B can be appropriately processed as a new stream that is discontinuous from the stream in the area A, triggered by the detection of the DIT packet.

In the third, fourth, and fifth embodiments, a case in which a part of a file is deleted has been described. However, a case in which a part of two files is connected to create one alternative file is described. Is also good. In this case, when the two parts are connected, some processing similar to that of the third, fourth, and fifth embodiments is required.

Alternatively, a part of one file may be extracted to create one alternative file. In this case, the same processing as in the third, fourth, and fifth embodiments is partially required for the head of the extracted portion.

{Furthermore, one file may be divided into two and two alternative files may be created. In this case, a process similar to that of the third, fourth, and fifth embodiments is partially required when the second file is created.

In any of the above cases, a file composed of a transport stream can be easily created by the same processing as in the third, fourth, and fifth embodiments.

Also, in the third, fourth and fifth embodiments, the case of the MPEG transport packet has been described, but it is clear that the data may have an arbitrary data structure.

(Embodiment 6)
Hereinafter, an AV data recording apparatus according to a sixth embodiment of the present invention will be described with reference to the drawings, focusing on differences from the first embodiment. Therefore, points that are not particularly described are the same as in the first embodiment.

FIG. 36 is a block diagram of an AV data recording apparatus according to Embodiment 6 of the present invention. The difference from FIG. 3 which is a block diagram of the AV data recording apparatus according to the first embodiment is that the output timing generation unit 13 is an output timing adjustment unit 14 and a time stamp attachment unit 15 is added. That is the point.

When recording the signals of the video signal input unit 1 and the audio signal input unit 2, the arrival time at which the transport stream output from the transport stream assembling unit 5 arrives at the time stamp attaching unit 15 is set to 27 MHz or 24 MHz. Expressed as a counter value that operates at a clock of .576 MHz, inserted before each transport packet, and recorded via the recording unit 6.

When a video signal is input from the 1394 interface and recorded, the arrival time at which the video signal arrives from the 1394 interface unit 9 to the time stamp attaching unit 15 is represented by a counter value operated by a clock of 27 MHz or 24.576 MHz. Then, it is inserted before each transport packet and recorded via the recording unit 6.

On the other hand, when the recorded video signal is output via the 1394 interface unit 9, the output timing adjustment unit 14 refers to the time stamp value added to the transport stream for each packet, and Adjust so that the packet delivery time interval matches the difference between the corresponding timestamps. The 1394 interface unit 9 outputs the transport packet to the 1394 transmission path so that the time interval between the delivered packets is maintained on the packet receiving side.

FIG. 37 is a diagram showing a recording form in the AV data recording apparatus according to the sixth embodiment of the present invention. The difference from FIG. 2 showing a recording form in the AV data recording apparatus according to the first embodiment is that a 4-byte time stamp is added before each transport packet. The VOBU includes a set of a time stamp and a video transport packet (“V_TSPT” in FIG. 37) and a set of a time stamp and an audio transport packet (“A_TSPT” in FIG. 37).

According to the above configuration, the time stamp is recorded as compared with the first embodiment, so that the recording capacity of the video data is reduced by about 2%, and when a personal computer is connected, one file becomes a pure MPEG standard data stream. There is also a disadvantage that it does not occur. However, a new merit is that the output timing generator 13 can be replaced by the output timing adjuster 14 as compared with the first embodiment.

In other words, this means that the 1394 output can be performed only by simple timing adjustment using the time stamp value added at the time of recording without generating the output timing for each transport packet based on the MPEG standard performed by the output timing generation unit 13. are doing.

However, as in the first embodiment, it is possible to easily record / reproduce a video via the 1394 interface and to guarantee continuous video reproduction. In addition, even when a personal computer is connected, the data stream is very close to the transport stream just by inserting a time stamp regularly, so that it is very easy to support MPEG playback software as an application for the personal computer. .

If the reference clock of the time stamp value is set to 27 MHz, a 27 MHz clock used for recording / reproducing a video and a 27 MHz used for reproducing a clock when an MPEG transport stream is input via a 139 interface can be used.

On the other hand, if the reference clock of the time stamp value is set to 24.576 MHz, it is the same as the reference clock of the 1394 interface unit 9 and can be used. When connected to a personal computer, it can be accessed as a transport stream file with a time stamp of 24.576 MHz. This 24.576 MHz is the same as the reference clock of the 1394 interface unit on the personal computer side. Therefore, even in the case of isochronous transfer of a file recorded from a personal computer to an external device via a 1394 transmission line, the output timing is adjusted based on 24.576 MHz used in the 1394 interface unit in the personal computer. It becomes possible.

That is, there is an advantage that it is not necessary to provide a dedicated clock circuit in the personal computer as compared with the case where the same is performed using 27 MHz. The structure of 192 bytes using 24.576 MHz is exactly the same as the structure of a source packet header (specified in IEC61883-4) that needs to be assembled at the time of transmission within the 1394 interface. Therefore, there is an advantage that the file can be transmitted as it is as the data structure inside the 1394 interface.

As described above, according to the sixth embodiment, 1394 output can be performed only by simple timing adjustment using the time stamp value added at the time of recording without newly generating output timing.

In the sixth embodiment, the data length of the time stamp is described as being 4 bytes, but the present invention is not limited to this.

In the sixth embodiment, the reference clock for the time stamp value is 27 MHz or 24.576 MHz, but another clock in the device may be used as the reference.

In the present embodiment, the storage medium is a phase-change optical disk. However, the storage medium is not limited to this. For example, DVD-RAM, MO, DVD-R, DVD-RW, DVD + RW, CD-R Any recording medium having a disk shape such as an optical disk such as a CD-RW or a hard disk may be used. Further, it may be a semiconductor memory.

Similarly, in this embodiment, the read / write head is a pickup, but in the case of an MO, it is a pickup and a magnetic head, and in the case of a hard disk, it is a magnetic head.

In the embodiment of the present invention, the transport stream may be in a format conforming to a digital broadcasting standard using MPEG. For example, a transport stream conforming to the Japanese BS digital broadcasting standard, a transport stream conforming to the US ATSC standard, and a transport stream conforming to the European DVB standard correspond to this. As a result, compatibility of the digital broadcast set-top box (STB) can be improved.

形式 Alternatively, the format may conform to digital data broadcasting using MPEG. This makes it possible to utilize functions of the STB such as a data broadcast receiving function.

In the embodiment of the present invention, the logical block is 32 kilobytes and the sector is 2 kilobytes. However, if the logical block size is an integral multiple of the sector size, the logical block may be 16 kilobytes, for example. Further, both the logical block and the sector may be 2 kilobytes.

FIG. 1 is a configuration diagram of an AV data recording device according to a first embodiment of the present invention. FIG. 2 is a diagram showing a recording form in the AV data recording apparatus according to the first embodiment of the present invention. FIG. 1 is a configuration diagram of an AV data recording / reproducing apparatus according to an embodiment of the present invention. FIG. 9 is a diagram showing recorded contents before a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. FIG. 10 is a diagram showing recorded contents after a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. FIG. 9 is a diagram showing a structure of a recorded content file before a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. FIG. 9 is a diagram showing a structure of a recording file after a delete operation in the AV data recording apparatus according to the second embodiment of the present invention. The figure which shows the numerical value regarding the allocation descriptor of the file entry before the deletion operation in the AV data recording device according to the second embodiment of the present invention. The figure which shows the numerical value regarding the allocation descriptor of the file entry after the deletion operation in the AV data recording device according to the second embodiment of the present invention. Processing flowchart of a deletion processing unit in the AV data recording device according to the second embodiment of the present invention FIG. 9 is a diagram showing a recording form in an AV data recording apparatus according to a third embodiment of the present invention. FIG. 14 is a diagram showing recorded contents before a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. FIG. 14 is a diagram showing recorded contents after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. FIG. 14 is a diagram showing recorded contents after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. FIG. 14 is a diagram showing recorded contents after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. FIG. 14 is a diagram showing recorded contents after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. FIG. 14 is a diagram showing a structure of a recording file after a delete operation in the AV data recording apparatus according to the fourth embodiment of the present invention. The figure which shows the numerical value regarding the allocation descriptor of the file entry before the deletion operation in the AV data recording device according to the fourth embodiment of the present invention. The figure which shows the numerical value regarding the allocation descriptor of the file entry after the deletion operation in the AV data recording device concerning Embodiment 4 of this invention. Processing flowchart of a deletion processing unit in an AV data recording device according to a fourth embodiment of the present invention FIG. 14 is a diagram showing a data structure of an allocation descriptor in the AV data recording device according to the fifth embodiment of the present invention. FIG. 14 is a diagram showing recorded contents before a delete operation in the AV data recording apparatus according to the fifth embodiment of the present invention. FIG. 14 is a diagram showing a structure of a recording file after a delete operation in the AV data recording apparatus according to the fifth embodiment of the present invention. The figure which shows the numerical value regarding the allocation descriptor of the file entry before the deletion operation in the AV data recording device according to the fifth embodiment of the present invention. The figure which shows the numerical value regarding the allocation descriptor of the file entry after the deletion operation in the AV data recording apparatus according to the fifth embodiment of the present invention. Processing flowchart of the deletion processing unit in the AV data recording device according to the fifth embodiment of the present invention Configuration diagram of conventional AV data recording / reproducing device The figure which shows the recording format at the time of video recording on DVD-RAM in real time The figure which shows the state in which the recorded content on DVD-RAM is managed by UDF or ISO / IEC 13346 file system Configuration diagram of allocation descriptor FIG. 4 is a diagram showing recorded contents before a delete operation of a recorded file on a DVD-RAM; FIG. 4 is a view showing recorded contents after a delete operation of a recorded file on a DVD-RAM; FIG. 4 is a diagram showing recorded contents on the premise of post-recording in an AV data recording / reproducing apparatus using a DVD-RAM. Illustration of recording format of transport stream FIG. 1 is a diagram showing a recording mode in an AV data recording apparatus according to one embodiment of the present invention. Configuration diagram of an AV data recording device according to a sixth embodiment of the present invention FIG. 10 is a diagram showing a recording form in an AV data recording apparatus according to a sixth embodiment of the present invention.

Explanation of reference numerals

Reference Signs List 1 video signal input unit 2 audio signal input unit 3 video compression unit 4 audio compression unit 5 transport stream assembling unit 6 recording unit 7 pickup 8 phase change optical disk 9 1394 interface unit 10 dummy packet generation unit for post-recording 11 PS / TS conversion and Output timing adjustment unit 12 TS / PS conversion unit 13 Output timing generation unit 14 Output timing adjustment unit 15 Time stamp attachment unit 31 Playback unit 32 Transport stream decomposition unit 33 Video decompression unit 34 Audio decompression unit 35 Video display unit 36 Audio output unit 37 Program stream disassembly unit 51 Program stream assembling unit 61 Recording control unit 62 Continuous data detection unit 63 Logical block management unit 64 Deletion control unit 65 Dubbing control unit 81 DVD-RAM disk

Claims (6)

A writer for continuously writing N (N is an integer of 3 or more) data streams each including a plurality of fixed-length packets to a plurality of logical blocks on a disk;
A deletion control unit that deletes the Kth to Lth (K and L are integers of 2 or more and less than N, L is an integer of K or more) of the written N data streams,
The size of the fixed-length packet and the size of the logical block are not related to an integer multiple,
The deletion control unit records a dummy packet immediately after the written (K−1) th data stream until reaching a predetermined first boundary, and records the written (L + 1) th data from a predetermined second boundary. Recording the dummy packet until reaching just before the data stream of
The AV data recording device, wherein the predetermined first boundary and the predetermined second boundary are arranged at positions related to the least common multiple of the size of the fixed-length packet and the size of the sector. A writer for continuously writing N (N is an integer of 3 or more) data streams each including a plurality of fixed-length packets to a plurality of logical blocks on a disk;
A deletion control unit that deletes the first to Kth (K is an integer of 1 or more and less than N) data streams among the written N data streams;
The deletion control unit records a dummy packet from a predetermined boundary until the data reaches a position immediately before the written (K + 1) th data stream;
The AV data recording apparatus, wherein the predetermined boundary is located at a position related to a least common multiple of a size of the fixed-length packet and a size of a sector. A writing step of sequentially writing N (N is an integer of 3 or more) data streams each including a plurality of fixed-length packets to a plurality of logical blocks on a disk;
A deletion control step of deleting Kth to Lth (K and L are integers of 2 or more and less than N, L is an integer of K or more) of the written N data streams,
The deletion control step records a dummy packet immediately after the written (K−1) -th data stream until reaching a predetermined first boundary, and records the written (L + 1) -th data from a predetermined second boundary. Recording the dummy packet until reaching just before the data stream of
The AV data recording method according to claim 1, wherein the predetermined first boundary and the predetermined second boundary are arranged at positions related to the least common multiple of the size of the fixed-length packet and the size of the sector. A writing step of sequentially writing N (N is an integer of 3 or more) data streams each including a plurality of fixed-length packets to a plurality of logical blocks on a disk;
A deletion control step of deleting a first to a K-th (K is an integer of 1 or more and less than N) data streams among the written N data streams;
The deletion control step records a dummy packet from a predetermined boundary until reaching the immediately before the written (K + 1) th data stream;
The AV data recording method, wherein the predetermined boundary is located at a position related to a least common multiple of a size of the fixed-length packet and a size of a sector. A plurality of logical blocks in which N data streams (N is an integer of 3 or more) each including a plurality of fixed-length packets are sequentially written,
K-th to L-th data streams (K and L are integers of 2 or more and less than N and L is an integer of K or more) of the written N data streams are deleted,
Immediately after the written (K-1) th data stream, a dummy packet is recorded until a predetermined first boundary is reached. From the predetermined second boundary, a dummy packet of the written (L + 1) th data stream is recorded. The dummy packet is recorded until reaching immediately before,
The disk according to claim 1, wherein the predetermined first boundary and the predetermined second boundary are arranged at positions related to a least common multiple of a size of the fixed-length packet and a size of a sector. A plurality of logical blocks in which N data streams (N is an integer of 3 or more) each including a plurality of fixed-length packets are sequentially written,
The first to Kth data streams (K is an integer of 1 or more and less than N) among the written N data streams are deleted,
Dummy packets are recorded from a predetermined boundary until reaching just before the written (K + 1) th data stream,
The disk according to claim 1, wherein the predetermined boundary is located at a position related to a least common multiple of a size of the fixed-length packet and a size of a sector.

Images