JP2001251585A - Recording-reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording-reproducing apparatus which will not breaks reproduced images, even if a special reproduction mode such as a fast reproduction mode is used. SOLUTION: A DVD-RAM disk has a sector size of 2,048 bytes. The transport streams TS1 and TS2, which have been stored once are rearranged and recorded on a DVD-RAM disk. In this example, TS1-1* to TS1-5* and TS2-6* to TS2-9*, i.e., I pictures are recorded in a sector 102. Due to such a recording, the fast reproduced images are obtained via the DVD-RAM disk in a fast reproduction mode by reproducing the sector 102. Under such conditions, the transfer rate will no increase nor reproduced images break.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing a transport stream transmitted by digital broadcasting from a data stream compressed by a compression technique such as MPEG.

[0002]

2. Description of the Related Art In a transport stream of a BS digital broadcast, as shown in an example in FIG. 5, a TS signal of a maximum of eight systems transmitted from a multiplexer as a TS synthesizer of a transmission line coding system is transmitted to each multiplexer. Are synthesized according to the control information from, and a superframe composed of 48 frames and 8 frames is constructed. The stream format of one frame is as shown in FIG. The transmission rate at the time of 48 slots is 57.17 Mbp.
s. This frame configuration includes a frame configuration including 44 slots, and the transmission rate at the time of 44 slots is 51.8925 Mbps.

[0003] As a TV image format, HD
A TV (1080I) signal, a 525P signal, a 525I signal, and the like are mixed.

[0004] In each of the slots, a transport stream of each MPEG is inserted. For example, as shown in FIG. 7, transport streams TS1 and 525P which are streams obtained by compressing an HDTV (1080I) signal are used.
A transport stream TS2 which is a stream obtained by compressing the signal and the 525I signal is inserted alternately.

At this time, the transmission rate of the stream obtained by compressing the HDTV (1080I) signal is 26.085 Mbp.
s. The transmission rate of the stream obtained by compressing the 525P signal is 17.39 Mbps, and the transmission rate of the stream obtained by compressing the 525I signal is 8.695 Mbps.
It has become. Thus, the transport stream T
Compressed streams having different transmission rates are mixed in S1 and TS2.

[0006]

FIG. 8 is a diagram showing a time axis of a BS digital broadcast input stream in which a plurality of transport streams TS1 and TS2 are multiplexed. As shown in FIG. 8, the transport stream TS
1 and the transport stream TS2 are sent alternately.

[0008] In FIG. 8, TS1-3 * is shown. 3 indicates that this is the third packet of the transport stream TS1. That is, n of TS1-n
Increase sequentially one by one. The transport stream to which * is added indicates that the packet includes an MPEG I picture.

If the transport stream of the BS digital broadcast shown in FIG. 8 is recorded as it is on the HDD, the transport stream TS1 (TS1-1)
*, TS1-2 *, TS1-3 *, TS1-4 *, TS
1-5 *) and the transport stream TS2 (T
S1-1, TS2-2, TS2-3, TS2-4, etc.)
Are alternately recorded on the HDD.

If this transport stream TS1
If you try to read the I picture of
As shown in FIG. 8, an extra transport stream T
The need to read S2 arises.

Similarly, I-pictures TS2-6 *, TS2-7 *, and T-2 of the transport stream TS2
Regarding S2-8 * and TS2-9 *, the interposed transport stream TS1 is recorded as it is. That is, it becomes necessary to read the transport stream TS1 between TS2-6 * and TS2-9 *.

This means that an unnecessary transport stream is read during high-speed reproduction or the like, and the transfer rate is unnecessarily increased. This causes image disorder such as a failure in the high-speed playback image.

An object of the present invention is to provide a recording / reproducing apparatus which does not cause a failure in reproduced images even when performing special reproduction such as high-speed reproduction.

[0013]

According to the present invention, there is provided a recording / reproducing apparatus comprising at least one data of a moving picture, a sound, a still picture, and a text corresponding to at least one image format. Receiving means for receiving the compressed stream, converting means for converting one or more compressed streams into a signal defined by a bus, temporarily storing one or more compressed streams on the bus, and Storage means for storing recording / reproducing data; and a recording format on a recording / reproducing medium from the recording / reproducing data and one or more data of the compressed stream. Output means for reading the compressed stream and outputting to the bus;
Recording means for recording the one or more compressed streams read on the bus on the recording / reproducing medium.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the technical concept of the present invention will be described.

When a plurality of transport streams TS1 and TS2 are received and recorded on the HDD, a plurality of transport streams TS1 are collectively recorded as shown in FIG. 2B. In particular, the part of the I picture is recorded collectively. Similarly, a plurality of transport streams TS2 are collectively recorded.

In the case of such recording, during high-speed reproduction of the HDD, as shown in FIG. 2C, the I picture portion of the combined transport stream TS1 and the I picture portion of the combined transport stream TS2 are combined. It suffices to read the data, so that problems such as an increase in the transfer rate do not occur, and there is no possibility that the reproduced image is broken.

Next, a plurality of transport streams T
A case where S1 and TS2 are recorded on an optical disk such as a DVD-RAM disk will be described.

In the case of an optical disk, as shown in FIG. 3C, a sector is defined on the optical disk. 2048B for DVD-RAM disk
yte sector size. As an example, FIG.
Multiple transport streams T rearranged in (b)
The recording method of S1 and TS2 will be described. In this example, TS1-1 * to TS1-5 *, which are I pictures, and TS2-6 *
To TS2-9 * are recorded in the sector 102.

With such a recording, in the case of high-speed reproduction,
In the DVD-RAM disk, a high-speed reproduced image can be obtained by reproducing the sector 102 as shown in FIG. In this case, problems such as an increase in the transfer rate do not occur, and there is no possibility that the reproduced image is broken.

FIG. 4 is a block diagram showing the basic configuration of the recording / reproducing apparatus according to the present invention.

The digital broadcast wave input to the input terminal 1 is supplied to a digital broadcast reception / demodulation / transport processing circuit 3.

The digital broadcast reception / demodulation / transport processing circuit 3 performs the following operations. A digital broadcast wave is received, subjected to amplification and frequency conversion, and then demodulated in a digital broadcast such as OFDM, and then error corrected. Further, for example, a descramble key is obtained through a telephone line modem, and the error-corrected signal is descrambled. Furthermore, the descrambled transport stream is separated into TS1 and TS2, and supplied to the recording / reproducing system 5 and the transport separation / video / audio / still image / text decoding circuit 11.

The operation of the recording / reproducing system 5 will be described later.

The transport separation, video / audio / still image / text decoding circuit 11 performs the following operations.

The transport separation, video / audio / still image / text decoding circuit 11
The transport streams (TS1 and TS2) from the demodulation / transport processing circuit 3 or the recording / reproducing system 5 are
Video, audio, still images, and text are separated into signals such as MPEG.

Next, with regard to the video, a DCT (Discrete Cosine) between motion compensation frames of MPEG2 is used.
Transform, discrete cosine transform) decoding processing is performed.

For audio, MPEG2 audio decoding processing or audio decoding processing such as AC3 is performed.

For text, inverse code conversion is performed.

Based on the input from the user interface 8, the MPU (Stream Open) of the recording / reproducing system 5
Under the control of the rating system 7, the digital broadcast receiving / demodulating / transport processing circuit 3 and the transport separation, video / audio / text decoding circuit 1
1 works.

FIG. 1 shows a more specific configuration of the recording / reproducing apparatus of the present invention. Note that the elliptical block represents software executed by the processor core 33.

The processor core 33 has a TS check 35
Table generation 47, DVD-RAM driver 37
, An HDD driver 39, a streamer VCR driver 41, a conversion format generator 43, a stream controller 49, and a user interface 53.

The TS → bus bridge 21 converts a plurality of transport streams (TS1 and TS2) from the digital broadcast reception / demodulation / transport processing circuit 3 into DT
The signal is converted into a signal defined by a V (digital broadcast) internal bus 20.

The converted transport stream is input to the input TS DMA controller 25 and the memory.
The data is temporarily stored in the memory 29 via the interface 27. The writing control of the memory 29 is performed by the stream controller 49.

A recording / reproduction drive is mounted on the recording / reproduction device. Here, the type of recording / reproduction drive is H
It may be a DD drive 65, a DVD-RAM drive 63, or a streamer VCR drive 67.

For example, when the DVD-RAM drive 63 is mounted, the DVD-RAM disk has a sector size of 2048 bytes as described above.
The sector size / position, recording / reproducing rate, buffer capacity, etc.) are stored in the memory 29 as the DVD-RAM driver 37.

The conversion format generation 43 is based on the recording / reproduction parameters and the input transport stream (TS1
And TS2) (transmission rate, packet size, image format, and other information), a DVD-RAM conversion format, that is, a method of converting input transport streams (TS1 and TS2) (DVD-RAM conversion format 45) Is calculated in advance and stored in the memory 29
To memorize it.

The points specially mentioned here are as follows.

First, as described in the prior art, the transmission rate when the frame configuration is 48 slots is 57.17.
The transmission rate when the frame configuration is 44 slots is different from the transmission rate depending on the slot configuration, such as 51.8925 Mbps.

Second, as described with reference to FIG. 7 and the prior art, an HDTV (1080
I) Signal, 525P signal and 525I signal are mixed.

Third, as an example, an HDTV (1080
I) The transmission rate of the compressed stream of the signal is 26.
The transmission rate of the stream compressed at 085 Mbps and 525P is 17.39 Mbps, the transmission rate of the stream compressed at 525I is 8.695 Mbps, and the transport streams TS1 and TS2
, Compressed streams having different transmission rates are mixed.

DVD-RAM conversion format generation 43
From the above basic data (information such as the transmission rate, packet size and image format), the DVD-
A format based on the recording / reproducing data of the RAM drive 63 is generated.

That is, as described in the description of FIG. 3C, the method of converting the input transport streams (TS1 and TS2) to be included in the sector size of 2048 bytes is determined. That is, the input transport stream TS
Decide how many sectors 1 and TS2 should be.

As described above, since there are various transmission rates and image formats, from these basic specifications,
The conversion format generation 43 first determines a DVD-RAM conversion format 45. As a specific example, when the transmission rate is high, a format for recording a signal of the transport stream TS1 over a plurality of sectors is determined.

A specific example of the DVD-RAM conversion format 45 will be described with reference to FIG.

As described above, the transmission rate of the stream obtained by compressing the 525I signal is 8.695 Mbps, and the HDTV
The transmission rate of the stream obtained by compressing the (1080I) signal is 26.085 Mbps.

The feature of the improved DVD-RAM high-speed reproduction shown in FIG.
In recording an I-picture signal. At this time, the generated code amount of the I picture of the compressed signal of the image format of the 525I signal having the low transmission rate of 8.695 Mbps is naturally a low generated code amount.
All the I-picture codes can be recorded in one sector of (d).

On the other hand, the transmission rate is 26.085 Mbps.
The generated code amount of the I picture of the compressed signal of the image format of the HDTV (1080I) signal which is higher than that of the 525I signal is about three times as large as that of the I picture of the 525I signal.
The code of the I picture cannot be recorded by only one sector (d), and the I picture is recorded over, for example, three sectors.

As described above, depending on the transmission rate, the DVD-
1 for I picture as RAM conversion format 45
There is a difference between allocating a sector and allocating three sectors. This factor is stored in the DVD-RAM conversion format 45 as an example.

Upon receiving a recording instruction from the user via the user interface 53, the TS → bus bridge 2
1 and the transport streams (TS1 and TS2) from the input TS DMA controller 25
Check 35 to confirm.

In the TS check 35, the specifications of the transport streams (TS1 and TS2) are confirmed.

In the United States DirectTV and the like, variable-length coding such as statistical multiplexing is used even for broadcast streams. In the TS check 35, it is necessary to detect the GOP header of the video bit stream in the transport stream (TS1 and TS2) and also confirm the transfer rate of the transport stream (TS1 and TS2).

Further, in the TS check 35, each picture header of each of a plurality of transport streams (TS1 and TS29) is detected, and an I picture in each of the TS1 and TS2 streams is detected.

Information such as the individual transmission rates of the GOPs separated by the TS check 35 and the I-pictures and the frame numbers in which the I-pictures are present are obtained by table generation 47.
It is stored as a table 51 on the memory 29.

The actual transport stream (TS1)
And TS2) are TS → bus bridge 21 as described above.
, The DTV internal bus 20, the input TS DMA controller 25, and the memory interface 27, and are temporarily stored in the memory 29.

The control of the memory 29 is performed by the stream controller 49.

The stream controller 49 reads the transport streams (TS1 and TS2) stored in the memory 29 based on the DVD-RAM conversion format 45 and the table 51 stored in the memory 29, and Recording drive DMA controller 31 and DTV internal bus 20
And DVD-RAM drive interface 61
And the DVD-RAM drive 63 to control the DVD
-Record on RAM disk.

In the stream controller 49, D
According to the VD-RAM conversion format 45 and the contents of the table 51, the transport stream (TS1 and TS
We will replace 2).

An example will be described. In the case of a compressed stream of an HDTV (1080I) signal specified in the DVD-RAM conversion format 45, the sector size for inserting an I picture requires 3, and in the case of a compressed stream of a 525I signal, a sector for inserting an I picture is required. The size needs one.

When the actual transport streams (TS 1 and TS 2) are rearranged by the stream controller 49, the I
According to the information of the frame number in which the picture and the I picture are present, the actual transport stream (TS1 and TS
2) is rearranged as shown in FIGS. 3A and 3B, for example. In this example, an image of rearrangement of transport streams (TS1 and TS2) and an image of kick of a high-speed playback pickup are shown.

In practice, the transport stream TS
The I-picture part of the compressed stream of the HDTV (1080I) signal inserted into the DVD-RAM 1
The conversion format 45 specifies three sectors.

In this example, the table 51 includes, as I-picture information relating to the transport stream TS1, TS1-1 *, TS1-2 *, TS1-3 *, and TS1-3.
It is stored that 1-4 * and TS1-5 * are I pictures. Further, the table 51 includes T picture as information of the I picture regarding the transport stream TS2.
S2-6 *, TS2-7 *, TS2-8 *, TS2-9
It is stored that * is an I picture.

In the stream controller 49, the DVD-RAM conversion format 45 described above and the table 51
Of the actual transport stream (T
S1 and TS2) are rearranged.

To explain a specific example, the HDTV (10
80I) The DV is recorded that the compressed stream of the signal is recorded.
The D-RAM conversion format 45 grasps each I picture information and the table 51 grasps each I picture information.
The controller 49 rearranges the transport stream so that the transport stream is recorded in a predetermined sector. For example, as shown in FIG. 3 (b), the I-pictures TS1-1 * and TS1-2 are stored in the sector 102.
*, TS1-3 *, TS1-4 *, and TS1-5 *.

As a result, at the time of high-speed reproduction, the sector in which the I picture is recorded may be reproduced.

As described above, as shown in FIG.
The streams of the plurality of transport streams (TS1 and TS2) are rearranged, and the TS1 and TS2 of the I picture are rearranged.
Are recorded on a DVD-RAM disk so as to be collectively located in the same sector 102, for example.

When reproducing, first, the recording medium (DVD-
The content recorded on the RAM disk is displayed. The user specifies the content to be reproduced using the user interface 7.

Based on the contents, a designated portion of the DVD-RAM disc is read, and a DVD-RAM drive is read.
Interface 61, internal bus 20, bus → TS
The signal is supplied to the transport separation / video / audio / still image / text decoding circuit 9 via the bridge 21. The bus → TS bridge 23 converts a signal defined by the DTV internal bus 20 into a signal format before being input to the TS → bus bridge 21.

(Special reproduction) During special reproduction such as high-speed reproduction and reverse high-speed reproduction, a DVD-RA is used as shown in FIG.
DVD-RA is used to play the necessary part of M disk.
A pickup is kicked to a designated portion of the M disk to reproduce a necessary image such as an I picture.

As a result, unnecessary portions need not be read, and special reproduction such as high-speed reproduction can be reproduced without image breakdown.

In the above description, the case of recording on a DVD-RAM disk has been described, but it is needless to say that the present invention is not limited to this. For example, as a recording medium, HD
D, Streamer VCR tape, etc.

(Supplementary note) (1) The broadcast recording / reproducing apparatus according to claim 2, wherein the maximum bit number is a sector size of a DVD-RAM disk.

(2) The recording / reproducing apparatus according to claim 2, wherein one or more compressed streams subjected to intra-frame processing are collectively recorded on the recording / reproducing medium.

[0073]

As described above, according to the present invention, there is provided a recording / reproducing apparatus which does not substantially break down the reproduced image even when performing special reproduction such as high-speed reproduction.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a more specific configuration of a recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram showing a method for recording a plurality of transport streams TS1 and TS2 on an HDD according to the present invention.

FIG. 3 is a diagram showing a method for recording a plurality of transport streams TS1 and TS2 on a DVD-RAM disc according to the present invention.

FIG. 4 is a block diagram of a basic configuration of a recording / reproducing apparatus according to the present invention.

FIG. 5 is a diagram showing a configuration of a transport stream of BS digital broadcasting.

FIG. 6 is a diagram showing a configuration of a stream format of one frame in FIG. 5;

FIG. 7 is a diagram illustrating a configuration of each MPEG transport stream.

FIG. 8 shows a plurality of transport streams TS1 and TS
FIG. 3 is a diagram showing a BS digital broadcast input stream in which 2 is multiplexed on a time axis.

[Explanation of symbols]

3. Digital broadcast reception / demodulation / transport processing circuit, 5. Recording / reproducing system, 7. MPU (Stream)
Operating System), 11: Transport separation, video / audio / still image / text decoding circuit, 20: DTV (digital broadcasting) internal bus,
21... TS to bus bridge, 23 .. bus to TS bridge, 25... Input TS DMA controller, 27.
-Memory interface, 29-Memory, 31-
Recording drive DMA controller, 33 processor core, 35 TS check, 37 DVD-RA
M driver, 39 HDD driver, 41 streamer VCR driver, 43 conversion format generation,
45 DVD-RAM conversion format, 47 table generation, 51 table, 53 user interface.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5C025 AA28 BA25 BA28 BA30 DA01 DA04 DA10 5C053 FA25 GB36 GB37 HA33 JA03 KA04 LA06 LA15 5C059 KK35 MA00 PP01 RB02 RB09 RC12 SS02 SS13 SS30 UA05 UA38 5D044 AB05 AB07 DE02 DE14 DE43 DE44 EF02 GK08 GK11 HL11

Claims (5)

[Claims] 1. A receiving means for receiving at least one or more data of at least one of video, audio, still image, and text corresponding to at least one image format, and at least one compressed stream of the data. A conversion unit for converting the compressed stream into a signal defined by a bus, a storage unit for temporarily storing one or more compressed streams on the bus, and storing recording / reproduction parameters of a recording / reproduction drive; Output means for determining a recording format on a recording / reproducing medium from recording / reproducing parameters and one or more parameters of the compressed stream, reading one or more compressed streams from the storage means in accordance with the recording format, and outputting to the bus Recording means for recording one or more compressed streams read on the bus onto the recording / reproducing medium. Recording and reproducing apparatus to be. 2. The recording device according to claim 1, wherein each of the one or more compressed streams is divided into a maximum number of bits or less calculated based on the recording / reproducing parameters, and a header is added to the divided data for recording on the recording / reproducing medium. The recording / reproducing apparatus according to claim 1, wherein: 3. The recording / reproducing apparatus according to claim 2, wherein the header has the image format. 4. The recording / reproducing apparatus according to claim 2, wherein the header has information on a length of the divided compressed stream. 5. The recording / reproducing apparatus according to claim 2, wherein the compressed stream recorded on the recording / reproducing medium is selectively read based on a reproduction mode selected and reproduced by a user.