JP2005141788A - Digital recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce throughput required for converting a format when dubbing a digital video sound signal in conformity to a DVD-VR format recorded on an HDD to a DVD in conformity to a DVD-Video format, and to speed up the dubbing between different formats. <P>SOLUTION: When the video sound signal to be inputted is recorded, the RDI pack of a digital video sound stream 41 formed in conformity to the DVD-VR format is changed to an RDI/DSI pack, where VOBU_1STREF_EA, VOBU_2NDREF_EA, VOBU_3RDREF_EA, and A_SYNCA are stored at the position concerned in an NV pack, thus eliminating the operation associated with format conversion and data movement work when dubbing is performed to the DVD in conformity with the DVD-Video format. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital recording / reproducing apparatus, and more particularly, to a digital recording / reproducing apparatus that once records a digital video and / or audio signal on a recording medium such as a hard disk and further dubbes it onto another recording medium such as a DVD.

  Conventionally, as a device of this type, for example, when a plurality of streams having different resolutions exist in a title recorded by the DVD-VR system, the title is automatically divided at a portion having a different resolution, and the DVD-Video system Some data is converted (for example, see Patent Document 1), and some information is inserted in advance in a recording medium in preparation for format conversion during dubbing (for example, see Patent Document 2). ).

JP 2003-153170 A (2nd page, FIG. 1) Japanese Unexamined Patent Publication No. 2003-151215 (page 3, FIG. 1)

  For example, when a video / audio signal recorded by a DVD (Digital Versatile Disc) -VR (Video Recording) method is dubbed to a recording medium recorded by the DVD-Video method, it is necessary to convert the DVD-VR format to a DVD-Video format. is there. At this time, it is necessary to place information necessary for the conversion at a position corresponding to the DVD-Video format, and it takes time for calculation, extraction and processing of information, and reinsertion. There was a problem that could not be shortened.

  An object of the present invention is to solve the above-mentioned problems and to perform a process necessary for converting a video / audio signal into a different format at the time of dubbing in a digital recording / reproducing apparatus for dubbing between recording media that record digital audio data in different formats. Is to reduce the dubbing time.

The digital recording / reproducing apparatus according to the present invention includes a first digital signal obtained by adding predetermined format information to a digital video / audio stream formed in accordance with the first format, from an input analog or digital uncompressed video and / or audio signal. First conversion means for converting video and / or audio signals; means for recording the first digital video and / or audio signals on a first recording medium; and the recording on the first recording medium. Means for reproducing the first digital video and / or audio signal; and converting the reproduced first digital video and / or audio signal into a second digital video and / or audio signal in accordance with the second format. Second conversion means, means for recording the second digital video and / or audio signal on a second recording medium,
The first converting means converts the input analog or digital uncompressed video and / or audio signal into the first digital video and / or audio signal according to the second format. And a navigation pack generating means for generating a navigation pack in which the predetermined format information is arranged corresponding to the arrangement position according to the second format.

  According to the present invention, the first digital video signal formed in accordance with the first format recorded on the first recording medium is converted into the second digital video and / or audio signal in accordance with the second format. Predetermined format information that takes a long time to generate for the dubbing to be converted and recorded on the second recording medium, and the arrangement position thereof have already been determined, so the amount of calculation accompanying the format conversion at the time of dubbing In addition, since it is possible to reduce both procedures such as extraction, processing, and re-insertion of information for positioning, it is possible to shorten the time required for dubbing.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a main configuration of a digital recording / reproducing apparatus according to Embodiment 1 based on a digital recording / reproducing apparatus according to the present invention.

  In the figure, an output unit of a video decoder 10 that inputs an input analog video signal INAV is connected to one input unit of an AV encoder 12, and an output of an audio ADC (Analog to Digital Converter) 11 that inputs an input analog audio signal INAA. The unit is connected to the other input unit of the AV encoder 12, and the output unit of the AV encoder 12 is connected to the input unit of the input / output buffer circuit 16. The output section of the input / output buffer circuit 16 is connected to the input section of the AV decoder 15, and one output section of the AV decoder 15 is connected to the input section of the video encoder 13 that outputs the output analog video signal OUAV. The other output unit is connected to an input unit of an audio DAC (Digital to Analog Converter) 14 that outputs an output analog audio signal OUAA.

  Also, the input / output buffer circuit 16 and HDD (Hard Disk Drive) interface circuit 18, the input / output buffer circuit 16 and DVD (Digital Versatile Disc) interface circuit 19, the input / output buffer circuit 16 and buffer memory 17, the HDD interface circuit 18 and HDD 20 Between the DVD interface circuit 19 and the DVD drive 21, signal paths for inputting / outputting predetermined signals to be described later are formed. Each of these components is arbitrarily controlled by a CPU (Central Processing Unit) 22 via a data bus (not shown).

  Before describing the operation of the digital recording / reproducing apparatus having the above configuration, the DVD-VR format and the DVD-Video format handled by the digital recording / reproducing apparatus will be described.

  FIG. 2 is a configuration example of a digital video / audio stream in each format of DVD-VR and DVD-Video. FIG. 2 (a) shows a digital video / audio stream 41 in the DVD-VR format, and FIG. As will be described later, a digital video / audio stream 43 of DVD-VR format generated based on the present invention is shown, and a digital video / audio stream 42 of DVD-Video format is shown in FIG.

  As shown in the figure, a digital video / audio stream conforming to each format is configured by arranging fixed byte-length data packets called packs. This pack is roughly divided into a video pack 54 storing video data, an audio pack 55 storing audio data, a navigation pack compliant with each format storing information necessary for reproduction, and other information (still image data). Etc.) and other packs (not shown).

  The navigation pack includes an RDI (Realtime Data Information) pack 51a compliant with the DVD-VR format, and an NV pack 51b compliant with the DVD-Video format. The RDI / DSI (Data Search Information) pack shown in FIG. 51c is a navigation pack in the DVD-VR format generated based on the present invention as will be described later.

  In many cases, the DVD-VR format of the digital video / audio stream 41 is mainly used as a recording format of a recording / playback DVD, and the DVD-Video format of the digital video / audio stream 42 is used as a recording format of a playback-only DVD. It is often done. A plurality of video packs 54 and audio packs 55 form a unit called a VOBU (Video Object Unit). Here, VOBU means the minimum reproducible unit. In the case of a digital video / audio stream 41 in the DVD-VR format, the RDI pack 51a is often arranged at the head of the VOBU, while the DVD-VR In the case of the digital video / audio stream 42 in the Video format, the NV pack 51b is arranged at the head of the VOBU.

  Therefore, when converting the DVD-VR format digital video / audio stream 41 to the DVD-Video format digital video / audio stream 42, as is apparent from FIG. 2, the conversion work from the RDI pack 51a to the NV pack 51b is performed. Necessary.

  Next, the internal structure of these RDI pack 51a, NV pack 51b, and RDI / DSI pack 51c will be described. 3A and 3B are configuration diagrams of these navigation packs. FIG. 3A shows an RDI pack 51a, and FIG. 3B shows an RDI / DSI obtained by adding desired information to the RDI pack 51a according to the present invention. The internal structure of the pack 51c and FIG. 5C shows the internal structure of the NV pack 51b.

  As shown in FIG. 3 (a), the RDI pack 51a has a relatively simple configuration including a pack header / system header and an RDI packet. In the RDI packet, playback control information and manufacturer information relating to VOBU are stored. By just storing, most of the area is occupied by the MNFI area that the manufacturer can use arbitrarily.

  On the other hand, as shown in FIG. 5C, the NV pack 51b has a complicated configuration and includes a lot of information as compared with the RDI pack 51a. The NV pack 51b includes a pack header / system header, a PCI (Presentation Control Information) packet storing reproduction control information, and a DSI (Data Search Information) packet storing special reproduction information.

  Along with the format conversion described later, it is necessary to perform a complicated operation when converting from the RDI pack 51a to the NV pack 51b. VOBU_1STREF_EA (the last address of the first reference picture) mainly constituting the NV pack 51b VOBU_2NDREF_EA (final address of the second reference picture), VOBU_3RDREF_EA (final address of the third reference picture), and A_SYNCA (audio pack address including an audio frame reproduced immediately after the video start time). Among them, VOBU_1STREF_EA, VOBU_2NDREF_EA, and VOBU_3RDREF_EA are video data address information, and A_SYNCA is audio data address information.

  However, since these predetermined format information can be obtained by the encoding means in real time if the audio / video signal is recorded in real time, these predetermined format information is stored in the MNFI area of the RDI pack 51a during the real time recording. A method for storing and saving the format information is known. On the other hand, in the RDI / DSI pack 51c according to the present invention shown in FIG. 3B, the information of the RDI pack 51a is stored in the RDI packet as shown in FIG. The DSI packet is arranged in accordance with a predetermined position in the NV pack 51b.

  As described above, the above-described predetermined format information is arranged in accordance with a predetermined position in the NV pack 51b, so that the data extraction and movement processing accompanying the format conversion at the time of dubbing can be omitted. it can.

  The digital video / audio stream 43 in the DVD-VR format shown in FIG. 2B is an RDI pack 51a of the digital video / audio stream 41 in the normal DVD-VR format shown in FIG. The structure is converted to 51c. Therefore, the digital video / audio stream 43 corresponds to a first digital video / audio signal obtained by adding predetermined format information to the digital video / audio stream 41 formed in accordance with the DVD-VR format.

  The digital recording / playback apparatus shown in FIG. 1 converts the input analog video / audio signal into a digital video / audio stream compliant with the DVD-VR format by the encoding means according to the above-described procedure, and a first recording medium such as a hard disk. 1 shows an example of a recording / reproducing apparatus that records data in a digital video / audio stream that conforms to the DVD-Video format and dubbes it onto a second recording medium such as a DVD. The operation of this apparatus will be described below.

  The input analog audio signal INAV and the input analog audio signal INAA are converted into a digital video signal INDV and a digital audio signal INDA by the video decoder 10 and the audio ADC 11, respectively.

  FIG. 4 is an internal configuration diagram of the AV encoder 12 that receives the digital video signal INDV and the digital audio signal INDA and executes signal processing to be described later.

  In the figure, a video signal encoding circuit 31 receives a digital video signal INDV, sequentially converts it into a video pack 54 encoded by the Moving Pictures Experts Group (MPEG) -2 method, and outputs it to the signal synthesis circuit 34. To do. On the other hand, the audio signal encoding circuit 32 receives the digital audio signal INDA, sequentially converts it into an audio pack 55 encoded by the Dolby AC-3 system, and outputs the audio pack 55 to the signal synthesis circuit 34. The navigation pack generation circuit 33 inputs necessary information from the video signal encoding circuit 31 and the audio signal encoding circuit 32, forms an RDI / DSI pack 51c shown in FIG. 3B, and outputs it to the signal synthesis circuit 34. To do.

  When the RDI / DSI pack 51c is formed, the navigation pack generation circuit 33 includes the information included in the RDI pack 51a in the RDI packet, and acquires the format information of VOBU_1STREF_EA, VOBU_2NDREF_EA, VOBU_3RDREF_EA, and A_SYNCA. This acquisition requires a lot of calculation time, but it can be processed sufficiently in time when processing is performed in synchronization with the generation of the video pack 54 and the audio pack 55. Then, the obtained predetermined format information is arranged at a predetermined position in the DSI packet corresponding to the arrangement position corresponding to the NV pack 51b shown in FIG.

  Specifically, the insertion positions of VOBU_1STREF_EA information, VOBU_2NDREF_EA information, VOBU_3RDREF_EA information, and A_SYNCA_information counted from the top of the RDI / DSI pack 51c are VOBU_1STREF_EA, VOBU_1STREF_EA, VOBU_1STREF_EA And the position of the A_SYNCA information. The signal synthesis circuit 34 sequentially inputs the video pack 54, the audio pack 55, and the RDI / DSI pack 51c, and the digital video / audio conforming to the DVD-VR format having the RDI / DSI pack 51c shown in FIG. A stream 43 is formed and transferred to the input / output buffer circuit 16.

  The digital video / audio stream 43 transferred to the input / output buffer circuit 16 is temporarily stored in the buffer memory 17 and recorded in the HDD 20 via the HDD interface circuit 18. The HDD interface circuit 18 converts the data received from the input / output buffer circuit 16 at the time of recording into an HDD interface signal such as ATAPI (AT Attachment with Packet Interface) and writes the data to the HDD 20. During reproduction from the HDD 20, a read operation is performed from the HDD 20, and data is extracted from HDD interface signals such as ATAPI and transferred to the input / output buffer circuit 16. The above is the procedure from converting the input analog video / audio signal to the DVD-VR format digital video / audio stream 43 having the RDI / DSI pack 51c and recording it on the HDD 20 as the first recording medium.

  In the case of normal processing not according to the present embodiment, the AV encoder generates the RDI pack 51 a together with the generation of the video pack 54 and the audio pack 55 described above and generates the digital video / audio stream 41 in the DVD-VR format. Then, the data is transferred to the input / output buffer circuit 16 and the same recording process is performed.

  Further, from the above description, the video decoder 10, the audio ADC 11, and the AV encoder 12 add the predetermined format information to the digital video / audio stream formed according to the first format from the input analog video / audio signal. The navigation pack generation circuit 33 of the AV encoder 12 obtains predetermined format information according to the second format, and converts the format information into the second format. The navigation pack generating means for generating the navigation pack arranged corresponding to the arrangement position according to the above, and the input / output buffer circuit 16, the HDD interface circuit 18 and the HDD 20 with the buffer memory 17 are connected to the first digital video / audio signal. The first note It can be a means for recording on the medium.

  Next, the procedure during reproduction will be described. The DVD-VR format digital video / audio stream 43 (FIG. 2B) having the RDI / DSI pack 51c recorded in the HDD 20 is transferred to the input / output buffer circuit 16 via the HDD interface circuit 12 and is then stored in the buffer memory 17. Is temporarily stored in the AV decoder 15 and then transferred to the AV decoder 15. The AV decoder 15 performs MPEG-2 decoding on the video pack 54 to restore the digital video signal, and also performs audio decoding on the audio pack 55 using the Dolby AC-3 method. Restore. The restored digital video / audio signals are reproduced as an output analog video signal OUAV and an output analog audio signal OUAA by the video encoder 13 and the audio DAC 14, respectively.

  The time information required for playback at this time is obtained from the RDI pack 51a, but the RDI / DSI pack 51c includes all the information that the RDI pack 51a has in the RDI packet. When the DVD-VR format digital video / audio stream 43 recorded on the HDD 20 is played back, no problem occurs. The HDD 20HDD and the interface circuit 18 can be used as means for reproducing the first digital video / audio signal.

  Next, a procedure at the time of dubbing to a DVD as a second recording medium will be described. The DVD-VR format digital video / audio stream 43 (FIG. 2B) having the RDI / DSI pack 51c recorded in the HDD 20 is transferred to the input / output buffer circuit 16 via the HDD interface circuit 18 and then buffered. It is temporarily stored in the memory 17. The buffer memory 17 is configured to be arbitrarily readable and writable from the CPU 22 via the input / output buffer circuit 16, and during this dubbing, the CPU 22 reads the RDI / DSI pack 51c (FIG. 3 (FIG. 3)) stored in the buffer memory 17. b)) is rewritten to the NV pack 51b (FIG. 3C).

  Usually, to obtain the format information of VOBU_1STREF_EA, VOBU_2NDREF_EA, VOBU_3RDREF_EA and A_SYNCA included in the DSI packet of the NV pack 51b, a large amount of calculation is required, but the format information is already stored in the RDI / DSI pack 51c. Therefore, no operation is required to obtain the format information at the time of dubbing. Further, in the RDI / DSI pack 51c, since the storage position of these format information is already aligned with the position of the NV pack 51b, the data movement process such that the CPU 22 reads the data once and then writes it again is omitted. And the amount of calculation can be further reduced.

  Of the parameters shown in the NV pack 51b, information other than the VOBU_1STREF_EA, VOBU_2NDREF_EA, VOBU_3RDREF_EA, and A_SYNCA needs to be obtained by calculation at the time of this dubbing, but there is no information that requires a large amount of calculation. Therefore, during this dubbing, rewriting from the RDI / DSI pack 51c to the NV pack 51b is completed by a small-scale calculation process.

  The data in the buffer memory 17 that has been rewritten from the RDI / DSI pack 51c to the NV pack 51b can be handled as a digital video / audio stream 42 (FIG. 2 (c)) in the DVD-Video format. Recording is performed on the DVD mounted on the DVD drive 21 from the circuit 16 through the DVD interface circuit 19. The DVD interface circuit 19 converts the data received from the input / output buffer circuit 16 into a DVD interface signal such as ATAPI and performs a write operation on the DVD 21. Conversely, when reproducing from the DVD 21, performs a read operation from the DVD 21. The data is extracted from the DVD interface signal such as ATAPI and transferred to the input / output buffer circuit 16.

  From the above description, the input / output buffer circuit 16 with the buffer memory 17 and the CPU 22 convert the first digital video / audio signal into the second digital video / audio signal conforming to the second format. The DVD interface circuit 19 and the DVD drive 21 can be means for recording the second digital video / audio signal on the second recording medium.

  As described above, according to the digital recording / reproducing apparatus of the present embodiment, it is possible to suppress the arithmetic processing necessary for converting the format from DVD-VR to DVD-Video at the time of dubbing as much as possible. Processing becomes possible. Alternatively, since high-speed arithmetic processing is not involved, it is not necessary to use a high-speed CPU, and the recording / reproducing apparatus can be configured at low cost.

  In the above-described embodiment, the AV encoder 12 acquires the above-described predetermined format information and further arranges the RDI / DSI pack 51c at a predetermined position. However, the present invention is not limited to this. For example, the AV encoder 12 simply acquires the above-described predetermined format information, and transfers a normal DVD-VR format digital video / audio stream 41 including the RDI pack 51a to the input / output buffer circuit 16, while the CPU 22 A predetermined format information may be once acquired from the AV encoder 12 and inserted into the RDI pack 51a stored in the buffer memory 17 via the input / output buffer circuit 16 at a predetermined position. In this case, the navigation pack generation means corresponds to the CPU 22 and the input / output buffer circuit 16 with the buffer memory 17 in addition to the AV encoder 12.

In the above embodiment, the digital recording / reproducing apparatus shown in FIG. 1 is configured to input an analog video / audio signal. However, the present invention is not limited to this, and the digital uncompressed video / audio signal, for example, ITU An R656 signal or a PCM (Pulse Code Modulation) audio signal may be input. In this case, the video decoder 10 and the audio ADC are passed.
Furthermore, in the above-described embodiment, an example in which a video / audio signal is recorded and dubbed has been shown, but it is needless to say that only an audio signal or only a video signal may be recorded and dubbed.

  As an application example of the present invention, the present invention can be applied to a DVD / HDD hybrid recorder using an HDD as a first recording medium and a DVD as a second recording medium. Further, the present invention can be applied to a device that performs dubbing accompanied by format conversion from the first recording medium to the second recording medium regardless of the recording medium.

It is a block diagram which shows the principal part structure of the digital recording / reproducing apparatus of Embodiment 1 based on the digital recording / reproducing apparatus by this invention. It is a structural example of the digital video / audio stream in each format of DVD-VR and DVD-Video, (a) is the digital video / audio stream 41 of the DVD-VR format, and (b) is generated based on the present invention. A digital video / audio stream 43 in the DVD-VR format is shown, and a digital video / audio stream 42 in the DVD-Video format is shown in FIG. FIG. 4 is a configuration diagram of a navigation pack, where (a) is an RDI pack 51a, (b) is an RDI / DSI pack 51c in which desired information is added to the RDI pack 51a according to the present invention, and (c) is NV. Each internal structure of the pack 51b is shown. 3 is an internal configuration diagram of an AV encoder 12. FIG.

Explanation of symbols

10 video decoder, 11 audio ADC, 12 AV encoder, 13 video encoder, 14 audio DAC, 15 AV decoder, 16 input / output buffer circuit, 17 buffer memory, 18 HDD interface circuit, 19 DVD interface circuit, 20 HDD, 21 DVD drive 22 CPU, 31 video encoding circuit, 32 audio signal encoding circuit, 33 navigation pack generation circuit, 34 signal synthesis circuit, 41 DVD-VR format digital video / audio stream, 42 DVD-Video format digital video / audio stream, 43 DVD-VR format digital video / audio stream generated according to Embodiment 1, 51a RDI pack, 51b NV pack, 51c RDI / DSI pack, 54 video packs, 55 audio packs.

Claims (6)

The input analog or digital uncompressed video and / or audio signal is converted into a first digital video and / or audio signal obtained by adding predetermined format information to a digital video and audio stream formed according to the first format. First conversion means;
Means for recording the first digital video and / or audio signal on a first recording medium;
Means for reproducing the first digital video and / or audio signal recorded on the first recording medium;
Second conversion means for converting the reproduced first digital video and / or audio signal into a second digital video and / or audio signal conforming to a second format;
Means for recording the second digital video and / or audio signal on a second recording medium,
The first converting means converts the input analog or digital uncompressed video and / or audio signal into the first digital video and / or audio signal according to the second format. And a navigation pack generating means for generating a navigation pack in which the predetermined format information is arranged in correspondence with the arrangement position according to the second format. . 2. The digital recording / reproducing apparatus according to claim 1, wherein the first format is a DVD-VR format, and the second format is a DVD-Video format. 3. The digital recording / reproducing apparatus according to claim 2, wherein the first recording medium is a hard disk, and the second recording medium is a DVD. 4. The digital recording / reproducing apparatus according to claim 2, wherein the predetermined format information conforming to the second format includes address information of video and / or audio signals. 5. The navigation pack according to claim 1, wherein the navigation pack is generated including both predetermined format information conforming to the first format and the predetermined format information conforming to the second format. A digital recording / reproducing apparatus according to claim 1. The predetermined format information according to the first format is RDI pack information in the DVD-VR format,
In the navigation pack generating means, the predetermined format information conforming to the second format is at least one of VOBU_1STREF_EA, VOBU_2NDREF_EA, VOBU_3RDREF_EA, and A_SYNCA, each counted from the head of the RDI pack 6. The digital recording / reproducing apparatus according to claim 5, wherein the arranged position is arranged in accordance with the arranged position counted from the head of the NV pack in the DVD-Video format.

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