JP2001119660A - Reproducing device, recorder and program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a conventional device that cannot dub AV data compressed in compliance with the MPEG at a speed other than the original speed. SOLUTION: This reproducing device is provided with reproduction means 11, 12, 13, 14 that reproduce an MPEG transport stream recorded on a recording medium at a prescribed speed and transmission means 15, 17 that transmit the reproduced MPEG transport stream at a prescribed transmission system without deleting PTS. The recorder is provided with reception means 19, 20, 21, that receive the MPEG transport stream sent from the reproduction device and recording means 22, 23, 24, 25 that record the MPEG transport stream at the prescribed speed while keeping the PTS having already been added without adding a new PTS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus, a recording apparatus, and a program recording medium for creating a copy of AV data.

[0002]

2. Description of the Related Art Digital broadcasting using MPEG2 has become widespread. Due to the excellent data compression technology of MPEG2, many high-quality programs have been broadcast on many channels. Along with this, the use of programs has been diversified. In other words, various usage methods have been created, such as recording a program and creating (dubbing) a copy of the recorded program, in addition to simply viewing the broadcasted program only once.

On the other hand, "IEEE 1394 Std. 1394-1" which is a standard suitable for the transfer of multimedia data.
995 IEEE Standard for Hig
hPerformance serial Bus "
(Hereinafter, referred to as IEEE 1394) has been studied, and some digital video cameras and the like have been commercialized.

For example, in a video camera using IEEE 1394 as a standard for data transfer, in addition to controlling recording and playback of the video camera, it is also possible to connect two video cameras to each other and to dub images without deteriorating image quality. I can do it.

[0005] In the following, A is connected via an IEEE 1394 bus.
A conventional reproducing apparatus and recording apparatus for dubbing V data will be described.

FIG. 12 is a block diagram showing the structure of a conventional reproducing device 59 and recording device 63.

[0007] The reproducing device 59 and the recording device 63 are based on IEEE.
It is connected via a 1394 bus 9 so that data and commands can be exchanged.

The reproducing device 59 includes a recording unit 11, a stream reproducing unit 60, a 27 MHz time stamp comparing / deleting unit 13, a 27 MHz fixed clock generating unit 61, 13.
It comprises a transmitting means 62.

The recording device 63 includes a 1394 receiving unit 64,
PCR extraction means 65, 27 MHz clock recovery means 6
6, 27 MHz time stamp adding means 67, recording stream generating means 68, and recording means 26.

[0010] Recording means 11 constituting the reproducing apparatus 59
Is a means that has a tape medium, on which AV data to be reproduced is recorded, and reproduces the recorded AV data.

[0011] The stream reproducing means 60 includes a recording medium 11
Is means for reproducing the AV data recorded in the MPEG-2 transport stream as an MPEG2 transport stream.

The 27 MHz fixed clock generating means 61
A clock whose frequency is fixed to 27 MHz is generated, and STC (System Ti
(meClock) is a means for counting up the count value of the counter at this frequency.

The 27 MHz time stamp comparing / deleting means 13 separates the time stamp added to the MPEG2 transport stream, compares the STC count value with this time stamp, and matches the STC count value with the time stamp. Then, the time stamp is deleted and the transport packet is output.

The 1394 transmission means 62 adds a transmission timestamp to the transport packet of the MPEG2 transport stream based on the time of 25 MHz indicated by the cycle time register to obtain a source packet,
Further, a source packet is divided into a plurality of pieces, or a plurality of source packets are combined, and then a CIP header and an isochronous header are added to create an isochronous packet, which is transmitted to the IEEE 1394 bus 9.

The 1394 receiving means 64 of the recording device 63 receives the isochronous packet transmitted from the IEEE 1394 bus 9, removes the isochronous header and the CIP header, restores the source packet, and restores the source packet header. The transmission time stamp added thereto is compared with the time of 25 MHz indicated by the cycle time register, and a transport packet is output at a timing when the transmission time stamp matches the time indicated by the cycle time register. Means.

The PCR extracting means 65 converts the MPEG2 transport stream output from the 1394 receiving means 64 into a PCR (Program Clock Reference).
rence).

The 27 MHz clock regenerating means 66 has a PL
This is a means that includes an L circuit, reproduces a 27 MHz clock that is a reference at the time of encoding from the extracted PCR value, and generates a count value of an STC counter that counts up at the frequency of this clock.

27 MHz time stamp adding means 67
Is means for adding a time stamp based on the count value of the STC counter to a transport packet of an MPEG2 transport stream.

The recording stream generating means 68 is means for converting the MPEG2 transport stream to which the time stamp has been added into a format for recording on the recording medium 26.

The recording means 26 is means for recording AV data.

The IEEE 1394 bus 9 is an IEEE 1394 bus.
This is a bus conforming to E1394.

Next, the operation of such a conventional reproducing device 59 and recording device 63 will be described with reference to FIGS.

FIG. 13 is a time chart showing the AV data at each of the points 1 to 5 shown in FIG. FIG.
Then, a time chart is shown on the assumption that the time elapses from the past to the future from the left side to the right side of the page.

The recording means 11 reproduces the AV data recorded on the tape medium and outputs it to the stream reproducing means 60.

The stream reproducing means 60 includes the recording means 11
Converts the format of the AV data reproduced in step 1 into an MPEG2 transport stream.

A output from the stream reproducing means 60
In the V data, a time stamp is added to the transport packet as indicated by a time stamp 69 based on 27 MHz in FIG.

The 27 MHz time stamp comparing / deleting means 13 separates the time stamp from the MPEG2 transport stream, and compares the STC count value generated by the 27 MHz fixed clock generating means 61 with the separated time stamp. Then, when the count value of the STC matches the time stamp, the time stamp is deleted, and the transport packet is output.

The AV data output from the 27 MHz time stamp comparing / deleting means 13 has the time stamp removed as shown in FIG. However, the time interval between the output transport packets is A
It is equal to the time interval of the transport packet when V data is recorded.

The 1394 transmission means 62 transmits a value obtained by adding the maximum delay time to the absolute time based on 25 MHz read from the cycle time register when the transport packet is input to the transport packet of the MPEG2 transport stream. Create a source packet by adding it as a time stamp. The transmission time stamp indicates a time at which the recording apparatus 63 wants to start processing. Further, after dividing the source packet into a plurality of parts or combining a plurality of source packets, an isochronous packet is created by adding a CIP header and an isochronous header, and the
The signal is transmitted to the 94 bus 9.

The AV output from the 1394 transmission means 62
The data is as shown in 3 of FIG. This is a source packet in which a time stamp 72 based on 25 MHz, which is one transmission time stamp, is added to one transport packet. Such a source packet is divided into a plurality of pieces, or a CIP header and an isochronous header are added to a data block in which a plurality of source packets are combined.

As described above, the reproducing device 59 is controlled by the IEEE
The reproduced AV data is transmitted to the E1394 bus 9 as an isochronous packet.

On the other hand, the 1394 receiving means 6 of the recording device 63
4 receives the isochronous packet transmitted from the IEEE 1394 bus 9 by identifying its channel number. Then, the source packet is restored by removing the isochronous header and the CIP header of the received isochronous packet. Further, the transport packet is obtained by removing the source packet header of the restored source packet. Then, the transmission time stamp described in the source packet header is compared with the absolute time of 25 MHz indicated by the cycle time register, and at the timing when the transmission time stamp matches the time indicated by the cycle time register, the transport packet is transmitted. Output.
As described above, the 1394 receiving unit 64 outputs the MPEG2 transport stream.

The AV output from the 1394 receiving means 64
As shown in 4 in FIG. 13, the time interval between transport packets output from the data is equal to the time interval between transport packets when the AV data is recorded. That is, the AV data is output as a transport packet, and the time interval is shown in FIGS.
The time interval is equal to the time interval between transport packets in (2).

The PCR extracting means 65 converts the MPEG2 transport stream output from the 1394 receiving means 64 into a PCR (Program Clock Reference).
rence). The PCR is a time indicated by a 27 MHz clock as a reference when encoding the AV data.

The 27 MHz clock regenerating means 66
An L circuit is provided, and a 27 MHz clock which is a reference at the time of encoding is reproduced from the extracted PCR value, and a count value of an STC counter which counts up at the frequency of this clock is generated.

27 MHz time stamp adding means 67
Adds a timestamp. That is, the count value of the STC counter when the transport packet is input is added as a time stamp to the transport packet of the MPEG2 transport stream.

The recording stream generating means 68 converts the MPEG2 transport stream to which the time stamp has been added into a format for recording on the recording medium 26.

The recording means 26 records AV data.

Thus, the AV data of the reproducing device 59 can be dubbed to the recording device 63.

[0040]

However, in the conventional reproducing apparatus and recording apparatus for dubbing MPEG-compressed AV data, dubbing can be performed only at 1 × speed. That is, when N is an integer of 1 or more and dubbing is performed at N times speed, the time interval of a series of time stamps of the reproduced AV data is set to N times the time interval at which the AV data is actually output. Has become. Therefore, the time stamp becomes meaningless. Also, if AV data reproduced at N times speed is sent,
When this AV data is received and recorded, a time stamp is added at a time interval of N times speed. When such AV data is recorded, it cannot be reproduced at 1 × speed because the time stamp interval is added at the time interval of N × speed.

That is, conventionally, MPEG-compressed A
There is a problem that V data cannot be dubbed at a speed higher than 1 × speed.

The present invention takes into consideration the problem that MPEG-compressed AV data cannot be dubbed at a speed higher than 1 × speed, and considers MPEG-compressed AV data as 1
It is an object of the present invention to provide a reproducing apparatus, a recording apparatus, and a program recording medium that can perform dubbing at a speed higher than double speed.

[0043]

In order to solve the above-mentioned problems, a first invention (corresponding to claim 1) is recorded on a recording medium together with a time stamp newly added at the time of recording. Playback means for playing back an MPEG transport stream at a predetermined speed;
And a transmission unit for transmitting the transport stream by a predetermined transmission method with the time stamp added.

The second invention (corresponding to claim 2)
The reproducing apparatus according to the first aspect, wherein the reproducing means reproduces the MPEG transport stream with or without observing a time indicated by the time stamp.

The third invention (corresponding to claim 3)
Is the playback device according to the first or second aspect of the present invention, wherein the predetermined speed is a 1x speed or a 1x speed or more.

The fourth invention (corresponding to claim 4)
The reproducing apparatus according to any one of the first to third aspects of the present invention, wherein the predetermined transmission method is a transmission method via an IEEE 1394 bus.

The fifth invention (corresponding to claim 5)
The transmission by the IEEE 1394 bus is a transmission using an isochronous packet, and the transmission unit transmits a transmission time to the isochronous packet according to a time interval of the MPEG transport stream output from the reproduction unit. Add a stamp,
A playback device according to a fourth aspect of the present invention, which transmits a signal.

The sixth invention (corresponding to claim 6)
, N is K * M (K and M are integers equal to or greater than 1), the predetermined speed is the N-times speed, and the transmission means converts the MPEG transport stream into one isochronous packet. The reproducing apparatus according to the fifth aspect of the present invention, wherein transmission is performed using the M channels at a speed of K times per channel.

The seventh invention (corresponding to claim 7)
The transmitting means transmits in advance, using an asynchronous packet, first information indicating which channel is to be used as the M channels and in which order the M channels are to be used. A reproducing apparatus according to a sixth aspect of the present invention, which is characterized in that:

The eighth invention (corresponding to claim 8)
The reproducing means reproduces or newly generates a special reproduction stream at the N-times speed, and the transmission means comprises:
The reproduction device according to the sixth or seventh aspect of the present invention, wherein the special reproduction stream is transmitted using a special reproduction channel other than the M channels as isochronous packets.

The ninth invention (corresponding to claim 9)
The present invention according to an eighth aspect of the present invention is characterized in that the transmitting means transmits, in advance, second information indicating which channel is to be used as the special reproduction channel using an asynchronous packet. It is a playback device of the description.

A tenth aspect of the present invention (corresponding to claim 10) is the reproducing apparatus according to the eighth or ninth aspect, wherein the N is equal to the reproducing speed of the trick play. .

According to an eleventh aspect of the present invention (corresponding to claim 11), the transmission over the IEEE 1394 bus is transmission using an isochronous packet, and the transmission means adds a transmission time stamp to the isochronous packet. A reproducing apparatus according to a fourth aspect of the present invention, characterized in that the reproducing apparatus performs transmission without transmitting.

In a twelfth aspect of the present invention (corresponding to claim 12), N is K * M (K, M is an integer of 1 or more), and the predetermined speed is the N-times speed, The transmission means converts the MPEG transport stream into an IE
An eleventh aspect of the present invention is a reproducing apparatus according to the eleventh aspect of the present invention, characterized in that EE1394 isochronous packets are transmitted at a rate of K times per channel using the M channels.

According to a thirteenth aspect of the present invention (corresponding to claim 13), the transmission means determines which channel is used as the M channels and in which order the M channels are used. The first information to be indicated is IEEE1
A reproducing apparatus according to a twelfth aspect of the present invention, characterized in that the reproducing apparatus transmits in advance using the 394 asynchronous packets.

According to a fourteenth aspect of the present invention (corresponding to claim 14), the time stamp newly added at the time of recording is added to all transport packets of the MPEG2 transport stream. The twelfth aspect of the present invention provides a reproducing method according to the twelfth aspect, wherein first information indicating which channel is used as the M channels is transmitted in advance using an IEEE 1394 asynchronous packet. Device.

According to a fifteenth aspect of the present invention (corresponding to claim 15), the reproducing means reproduces or newly generates a special reproduction stream at the N-times speed, and the transmission means comprises an IEEE 1394 isochronous. The twelfth or thirteenth reproducing apparatus according to the present invention, wherein the special reproduction stream is transmitted using a special reproduction channel other than the M channels as packets.

According to a sixteenth aspect of the present invention (corresponding to claim 16), the transmission means transmits second information indicating which channel is to be used as the special reproduction channel,
A fifteenth aspect of the present invention is a reproducing apparatus according to the fifteenth aspect of the present invention, which transmits in advance using asynchronous packets of IEEE 1394.

A seventeenth invention (corresponding to claim 17) is the reproduction apparatus according to the fifteenth or sixteenth invention, wherein N is equal to the reproduction speed of the special reproduction. .

According to an eighteenth aspect of the present invention (corresponding to claim 18), the transmission means transmits the trick play stream to an I
Instead of transmitting as an IEEE 1394 isochronous packet, the special reproduction stream is
A reproducing apparatus according to any one of eighth to tenth to seventeenth aspects of the present invention, wherein the reproducing apparatus transmits the packet as 94 asynchronous packets.

According to a nineteenth aspect of the present invention (corresponding to claim 19), the predetermined transmission system is an Ethernet transmission. Playback device.

According to a twentieth aspect of the present invention, there is provided a receiving means for receiving an MPEG transport stream transmitted by the reproducing apparatus according to any one of the first to fourth aspects of the present invention, Recording means for recording the MPEG transport stream at the predetermined speed while keeping the time stamp already added without adding a new time stamp. .

According to a twenty-first aspect of the present invention (corresponding to claim 21), an isochronous packet transmitted by the reproducing apparatus according to the fifth aspect of the present invention is received, and the transmission time stamp and the cycle time are compared with each other. Receiving means for outputting an MPEG transport stream while synchronizing, and recording the MPEG transport stream at the predetermined speed without adding a new time stamp and leaving the time stamp already added as it is. And a recording means for performing the recording.

According to a twenty-second aspect of the present invention (corresponding to claim 22), the reproducing apparatus according to the sixth or seventh aspect of the present invention uses M channels to transmit at a rate of K times speed per channel. Receiving the received IEEE 1394 isochronous packet, and synchronizing the transmission time stamp and the cycle time with the isochronous packet of the M channels from the MPE.
Receiving means for restoring and outputting a G transport stream, and recording for recording the MPEG transport stream at N times speed without adding a new time stamp and leaving the time stamp already added as it is And a recording device.

According to a twenty-third aspect of the present invention (corresponding to claim 23), the receiving means receives the first information in advance, receives the isochronous packet based on the first information, A recording apparatus according to a twenty-second aspect of the present invention, wherein the MPEG transport stream is restored and output.

According to a twenty-fourth aspect of the present invention (corresponding to claim 24), the isochronous transmission of M channels and special reproduction channels transmitted by the reproducing apparatus according to any one of the fifteenth to seventeenth aspects of the present invention. Receive the packet,
Receiving means for restoring and outputting an MPEG transport stream from the M channels and the special reproduction channel while synchronizing the transmission time stamp and the cycle time, without adding a new time stamp Recording means for recording the MPEG transport stream at N times speed with the time stamp already added as it is, and display means for decoding and displaying the special reproduction stream. Is a recording device.

According to a twenty-fifth aspect of the present invention (corresponding to claim 25), the receiving means receives the second information in advance, receives the isochronous packet based on the second information, A recording apparatus according to a twenty-fourth aspect of the present invention, wherein the trick play stream is restored.

According to a twenty-sixth aspect of the present invention (corresponding to claim 26), the recording apparatus according to the twenty-fourth or twenty-fifth aspect of the present invention is characterized in that the N is equal to the reproduction speed of the special reproduction. .

In a twenty-seventh aspect of the present invention (corresponding to claim 27), the display means sets the reproduction speed of the special reproduction to L.
When the relationship with N is L <N, the time axis of the trick play stream is extended N times, and L / N
A twenty-fourth or twenty-fifth recording apparatus according to the present invention, characterized in that a stream for special playback is thinned out.

According to a twenty-eighth aspect of the present invention (corresponding to claim 28), the isochronous packet transmitted by the reproducing apparatus according to the eleventh aspect of the present invention is received, and the transmission time stamp and the cycle time are compared with each other. The receiving means for outputting the MPEG transport stream without synchronization, and the timestamp already added without adding a new timestamp, the MPEG transport stream is output at the predetermined speed. Recording means for recording.

According to a twenty-ninth aspect of the present invention (corresponding to claim 29), the reproducing apparatus according to the thirteenth aspect of the present invention uses M channels and is transmitted at a K-times speed per channel. Receiving means for receiving an incoming IEEE 1394 isochronous packet, restoring and outputting an MPEG transport stream from the isochronous packets of the M channels without synchronizing the transmission time stamp and the cycle time; Without adding a new time stamp, leaving the time stamp already added,
Recording means for recording a transport stream at N times speed.

According to a thirtieth aspect of the present invention (corresponding to claim 30), the receiving means receives the first information in advance, receives the isochronous packet based on the first information, The recording apparatus according to the twenty-ninth aspect, wherein the MPEG transport stream is restored and output.

According to a thirty-first aspect of the present invention (corresponding to claim 31), the reproducing apparatus according to the fourteenth aspect of the present invention uses M channels and is transmitted at a rate of K times speed per channel. Receiving means for receiving an incoming IEEE 1394 isochronous packet, restoring and outputting an MPEG transport stream from the isochronous packets of the M channels without synchronizing the transmission time stamp and the cycle time; Without adding a new time stamp, leaving the time stamp already added,
Recording means for recording a transport stream at N times speed.

In a thirty-second aspect of the present invention (corresponding to claim 32), the receiving means receives the first information in advance and receives the isochronous packet based on the first information, A recording apparatus according to a thirty-first aspect of the present invention, wherein the MPEG transport stream is restored and output.

According to a thirty-third aspect of the present invention (corresponding to claim 33), in the restoration, the isochronous packets of the M channels having a smaller value of the time stamp added inside the isochronous packets are used. The recording apparatus according to the thirty-second aspect of the present invention, wherein the recording is performed by sequentially outputting the recording apparatus.

According to a thirty-fourth aspect of the present invention (corresponding to claim 34), an isochronous packet of M channels and special reproduction channels transmitted by the reproducing apparatus according to the fifteenth or sixteenth aspect of the present invention is received. Receiving means for restoring and outputting an MPEG transport stream from the M channels and the trick play channel without synchronizing the transmission time stamp with the cycle time; and a new time stamp. The MPEG transport stream is converted to N
A recording apparatus comprising: recording means for recording at a double speed; and display means for decoding and displaying the special reproduction stream.

According to a thirty-fifth aspect of the present invention (corresponding to claim 35), the receiving means receives the second information in advance, receives the isochronous packet based on the second information, The recording apparatus according to a thirty-fourth aspect of the present invention, wherein the trick play stream is restored.

A thirty-sixth aspect of the present invention (corresponding to claim 36) is the recording apparatus according to the thirty-fourth or thirty-fifth aspect, wherein N is equal to the reproduction speed of the trick play. .

According to a thirty-seventh aspect of the present invention (corresponding to claim 37), the display means sets the reproduction speed of the special reproduction to L.
When the relationship with N is L <N, the time axis of the trick play stream is extended N times, and L / N
A thirty-fourth or thirty-fifth recording apparatus according to the present invention, characterized in that a stream for special playback is thinned out.

According to a thirty-eighth aspect of the present invention (corresponding to claim 38), an asynchronous packet transmitted by the reproducing apparatus according to the twentieth aspect of the present invention is received, and a special reproduction stream is used as an MPEG transport stream. Receiving means for outputting, a recording means for recording the MPEG transport stream at N times speed without adding a new time stamp, and the stream for trick play, And a display unit for decoding and displaying the data.

The thirty-ninth aspect of the present invention (corresponding to claim 39) comprises a receiving means for receiving an MPEG transport stream transmitted via the Ethernet by the reproducing apparatus according to the nineteenth aspect of the present invention. Recording means for recording the MPEG transport stream at the predetermined speed while keeping the time stamp already added without adding a new time stamp. is there.

A fortieth aspect of the present invention (corresponding to claim 40) is characterized in that the time stamp is represented by 4 bytes. Device.

According to a forty-first aspect of the present invention (corresponding to claim 41), the time stamp is represented by 4 bytes, wherein the time stamp is represented by 4 bytes. Device.

Further, a forty-second invention (corresponding to claim 42) is directed to a special reproduction data generation for generating special reproduction data by extracting an I frame from the MPEG transport stream restored by the receiving means. Means, and display means for decoding and displaying the special reproduction data and displaying the decoded data.
33. A recording apparatus according to any one of the above-described items.

A forty-third aspect of the present invention (corresponding to claim 43) relates to all or a part of all or a part of the reproducing apparatus or the recording apparatus according to any one of the first to forty-second aspects of the present invention. A program recording medium characterized by recording a program for causing a computer to execute a function.

[0086]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In this embodiment,
A case where a copy of AV data is created (dubbed) at a speed of K times (K is a number of 1 or more) will be described.

FIG. 1 is a block diagram showing a configuration of the reproducing apparatus 10 and the recording apparatus 18 according to the present embodiment.

The reproducing apparatus 10 comprises a recording means 11, a K-speed stream reproducing means 12, a 27 MHz time stamp comparing / deleting means 13, a changeover switch 14, a 25 MHz time stamp adding means 15, a changeover switch 16, an isochronous packet generation / 1394 transmission means. 17.

The recording device 18 includes a 1394 reception / source packet separation unit 19, a 25 MHz time stamp comparison / deletion unit 20, a changeover switch 21, a PCR extraction /
It comprises a 27 MHz reproducing means 22, a 27 MHz time stamp adding means 23, a changeover switch 24, a K-speed stream recording means 25, and a recording means 26.

Further, the reproducing device 10 and the recording device 18
They are connected by an IEEE 1394 bus 9 and can exchange data and commands with each other. IEEE1
The 394 bus 9 is a bus conforming to IEEE1394.

[0092] The recording means 11 constituting the reproducing apparatus 10 comprises:
A to have a tape medium and to be reproduced on the tape medium
It is means for recording V data and reproducing the recorded AV data.

The K-times stream reproduction means 12 is means for reproducing AV data recorded on the recording medium 11 as an MPEG-2 transport stream at K-times speed.

The 27 MHz time stamp comparing / deleting means 13 separates the time stamp added to the transport packet of the MPEG2 transport stream, and performs STC (System Time Clock).
Is a means for comparing the count value of the STC with the time stamp, and when the count value of the STC matches the time stamp, deletes the time stamp and outputs the transport packet.

The switch 14 controls the 27 MHz time stamp comparing / deleting means 13 to perform processing on the MPEG-2 transport stream when K is 1, that is, when reproducing at 1 × speed, and 1
If not, that is, if the reproduction is performed at a speed higher than 1 × speed, the switch is a switch for controlling so that the processing of the 27 MHz time stamp comparing / deleting means 13 is not performed.

25 MHz time stamp adding means 15
Is a means for adding a transmission time stamp to a transport packet on the basis of an absolute time counted up at a frequency of 25 MHz indicated by a cycle time register of the IEEE 1394 to create a source packet.

The changeover switch 16 is a changeover switch for switching the processing of the time stamp when transmitting the isochronous packet to the IEEE 1394 bus 9, and in this embodiment, the 25 MHz time stamp adding means 15 is always used.
From isochronous packet to 1394 transmission means 1
7 is set so that AV data is passed.

The isochronous packet generation / 1394 transmission means 17 divides the source packet into a plurality
Or combine multiple source packets into one and then
An isochronous packet is created by adding a CIP header and an isochronous header, and the IEEE 1394 bus 9
Means for transmitting to

The 1394 receiving / source packet separating means 19 constituting the recording device 18 is based on the IEEE 1394 standard.
The isochronous packet transmitted from the bus 9 is received, the isochronous header and the CIP header are removed, and the divided source packets are combined to restore the source packet, or the combined source packet is divided and the source packet is restored. It is means for separating packets.

The 25 MHz time stamp comparing / deleting means 20 restores the transport packet by removing the header of the source packet, and stores the transmission time stamp in the removed source packet header and the 25 MHz frequency indicated by the cycle time register. Is a means for outputting a transport packet at a timing at which the transmission time stamp matches the time indicated by the cycle time register, by comparing the absolute time counted up by.

The changeover switch 21 is a changeover switch for switching the processing of the transmission time stamp. In this embodiment, the 25 MHz time stamp comparison / deletion means 2 is always used.
0 is set so that AV data is processed.

The PCR extraction / 27 MHz reproduction means 22
A PLL circuit is provided, and a PCR (Program Clock R) is output from the MPEG2 transport stream.
STC that reproduces a 27 MHz clock which is a reference at the time of encoding from the extracted PCR value and counts up at the frequency of this clock.
This is a means for generating the count value of the counter.

27 MHz time stamp adding means 23
Is means for adding a time stamp based on the count value of the STC counter to the transport packet.

The changeover switch 24 is a means for changing the flow of processing when dubbing at a normal speed and dubbing at other speeds.

The K-times stream recording means 25 converts the MPEG-2 transport stream to which the time stamp has been added into a format for recording on the recording means 26,
It is a means for recording.

The recording means 26 is means for recording AV data.

The recording means 11, the K-speed stream reproducing means 12, the 27 MHz time stamp comparing / deleting means 13, and the changeover switch 14 of the present embodiment are examples of the reproducing means of the present invention. The time stamp adding means 15, the changeover switch 16, and the isochronous packet generating means 17 are examples of the transmitting means of the present invention.
1394 reception / source packet separation means 19, 25 MH
z time stamp comparing / deleting means 20, changeover switch 2
Reference numeral 1 denotes an example of a receiving unit according to the present invention.
The R extracting / 27 MHz reproducing means 22, the 27 MHz time stamp adding means 23, the changeover switch 24, the K-speed stream recording means 25, and the recording means 26 are examples of the recording means of the present invention.

Next, the operation of this embodiment will be described.

First, the operation when K = 1, that is, when dubbing at 1 × speed will be described.

FIG. 2 shows a case where reproduction is performed at 1 × speed.
6 is a time chart showing AV data at each of locations 1 to 6 shown in FIG. 1. FIG. 2 shows a time chart assuming that the time elapses from the past to the future from the left side to the right side of the page.

First, before transmitting the AV data, the reproducing apparatus 10 obtains the channel number and the bandwidth required for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Further, the recording device 18 is notified of the acquired channel number using asynchronous transmission.

The recording means 11 reproduces the AV data recorded on the tape medium and outputs it to the K-speed stream reproducing means 12.

The K-speed stream reproducing means 12 converts the format of the AV data reproduced by the recording means 11 and outputs an MPEG2 transport stream.

The AV data output from the K-speed stream reproducing means 12 is shown in FIG. In the figure, A, B, C
The transport packets are output in the order of... Also, as shown by a time stamp 27 based on 27 MHz, a time stamp is added to the head of the transport packet. The time stamp is added when recording the AV data.

The 27 MHz time stamp comparing / deleting means 13 separates the time stamp added to the MPEG-2 transport stream, and compares the separated time stamp with the STC count value counted up at a frequency of 27 MHz. Then, when the count value of the STC matches the time stamp, the time stamp is deleted, and the transport packet is output.

The AV data output from the 27 MHz time stamp comparing / deleting means 13 has the time stamp removed as shown in FIG. However, the time interval between the output transport packets is equal to the time interval at which the transport packets were input when the AV data was recorded.

25 MHz time stamp adding means 15
Is 25M read from the cycle time register when the transport packet is input to the transport packet of the MPEG2 transport stream.
A source packet is created by adding a value obtained by adding the maximum delay time generated when the signal is transmitted on the IEEE 1394 bus 9 to the absolute time based on the Hz as a transmission time stamp to the transport packet. The transmission time stamp indicates a time at which the recording apparatus 18 wants to start processing.

The AV data output from the 25 MHz time stamp adding means 15 has a time stamp 28 based on a 25 MHz reference which is a time stamp for transmission, as shown at 3 in FIG.

The isochronous packet generation / 1394 transmission means 17 divides one source packet into a plurality of pieces or combines a plurality of
An isochronous packet is created by adding a CIP header and an isochronous header, and the IEEE 1394 bus 9
To be transmitted.

The AV data from the isochronous packet generation / 1394 transmission means 17 contains one AV data every one 125 microsecond isochronous cycle as shown in FIG.
Two isochronous packets 30 are output. M
The transmission rate of the PEG2 transport stream is 28
Mbps. When two transport packets are combined and transmitted per isochronous, the transmission rate becomes 24 Mbps. When three transport packets are combined and transmitted per isochronous transmission rate is 36 Mbps. Therefore, M
The transmission rate of the PEG2 transport stream is 28
In the case of Mbps, three or two transport packets are combined and transmitted per isochronous cycle.

In this way, the playback device 10 is
The reproduced AV data is transmitted to the E1394 bus 9 as an isochronous packet.

On the other hand, the 1394 reception / source packet separation means 19 of the recording device 18 receives the isochronous packet transmitted from the IEEE 1394 bus 9 by identifying its channel number. Then, the isochronous header and the CIP header of the received isochronous packet are removed to obtain a data block. Further, source packets are separated by combining a plurality of data blocks or dividing the data blocks. MPEG2
When the transmission rate of the transport packet is 28 Mbps and the data is reproduced at 1 × speed, the source packet is obtained by dividing the data block.

The 25 MHz time stamp comparing / deleting means 20 removes the source packet header of the source packet to obtain a transport packet. Then, the transmission time stamp described in the source packet header is compared with the absolute time of 25 MHz indicated by the cycle time register, and at the timing when the transmission time stamp matches the time indicated by the cycle time register, the transport packet is transmitted. Output. The AV data output from the 25 MHz timestamp comparing / deleting means 20 is the same as that of FIG.
As shown in FIG. 2, the time interval is equal to the transport packet of the transport stream 2 in FIG.

The PCR extraction / 27 MHz reproduction means 22
PCR from the MPEG2 transport stream output from the 25 MHz time stamp comparing / deleting means 20
(Program Clock Reference)
Is extracted. The PCR is a time indicated by a 27 MHz clock as a reference when encoding the AV data.

The PCR extraction / 27 MHz reproduction means 22
A PLL circuit is provided, which reproduces a 27 MHz clock which is a reference at the time of encoding from the extracted PCR value, and reproduces the count value of an STC counter which counts up at the frequency of this clock.

27 MHz time stamp adding means 23
Adds a time stamp to the transport packet. That is, the count value of the STC counter when the transport packet is input is added to the transport packet as a time stamp. The count value of the STC counter is represented by 6 bytes. For example, 4 bytes of the 6 bytes are used as a time stamp value.

The AV data output from the 27 MHz time stamp adding means 23 has a time stamp 2 at the beginning of the transport packet as shown in FIG.
A time stamp 31 based on 7 MHz is added.

The K-times stream recording means 25 converts the MPEG-2 transport stream to which the time stamp has been added into a format for recording on the recording medium 26.

[0130] The recording means 26 records AV data.

Thus, the AV data is dubbed.

Next, the operation when K = 2, that is, when dubbing at double speed, will be described.

FIG. 3 shows a case where reproduction is performed at double speed.
6 is a time chart showing AV data at each of locations 1 to 6 shown in FIG. 1. FIG. 3 illustrates a time chart assuming that the time elapses from the past to the future from the left side to the right side of the page.

First, before transmitting the AV data, the reproducing apparatus 10 acquires the channel number and the bandwidth required for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Further, the acquired channel number is notified to the recording device 37 using the asynchronous transmission.

The recording means 11 reproduces the AV data recorded on the tape medium and outputs it to the K-speed stream reproducing means 12.

The K-speed stream reproducing means 12 converts the format of the AV data reproduced by the recording means 11 and outputs an MPEG2 transport stream.

The AV data output from the K-times stream reproducing means 12 is shown in FIG. 27MH at 1 in FIG.
As shown by a time stamp 27 based on z, a time stamp is added to the head of the transport packet.

The MPEG2 transport stream output from the K × speed stream reproducing means 12 is different from the dubbing at the 1 × speed, and does not pass through the 27 MHz time stamp comparing / deleting means 13 but directly through the 25 MHz time stamp adding means 15. Passed to. That is, when the data is reproduced at the double speed, the time indicated by the PTS becomes meaningless. 27MHz time stamp comparison
Since the MPEG2 transport stream is not processed by the deletion unit 13, the time stamp is still added, and the time interval between transport packets is not adjusted.

The AV data output from the changeover switch 14 is a time stamp 27 based on 27 MHz shown in FIG.
, The time stamp is still added to the beginning of the transport packet.

25 MHz time stamp adding means 15
Is 25M read from the cycle time register when the transport packet is input to the transport packet of the MPEG2 transport stream.
A source packet is created by adding a value obtained by adding the maximum delay time generated when the signal is transmitted on the IEEE 1394 bus 9 to the absolute time based on the Hz as a transmission time stamp to the transport packet. The transmission time stamp indicates a time at which the recording apparatus 18 wants to start processing.

The AV data output from the 25 MHz time stamp adding means 15 is shown in FIG. In 3 of FIG. 2, the source packets are sequentially output. As shown in 3 of FIG. 2, a time stamp 27 based on a 27 MHz as a time stamp is added to the beginning of the transport packet, and a time stamp based on a 25 MHz as a transmission time stamp is added to the header of the source packet. 28 is added.

The isochronous packet generation / 1394 transmission means 17 divides one source packet into a plurality of pieces or combines a plurality of
An isochronous packet is created by adding an IP header and an isochronous header, and transmitted to the IEEE 1394 bus 9.

In the AV data from the isochronous packet generation / 1394 transmission means 17, an isochronous packet 30 is output at every 125 microsecond isochronous cycle as shown in FIG. MPEG
2 The transmission rate of the transport stream is 28 Mbp
s. In this case, since the reproduction is performed at the double speed, the required transmission rate is 56 Mbps. When two transport packets are combined and transmitted per isochronous, the transmission rate becomes 24 Mbps. When three transport packets are combined and transmitted per isochronous, the transmission rate is 36.
Mbps. Therefore, since reproduction is performed at double speed, the required transmission rate is 56 Mbps, and a maximum of six transport packets are combined and transmitted per isochronous cycle.

As described above, the playback device 10 is capable of performing the
The reproduced AV data is transmitted to the E1394 bus 9 as an isochronous packet.

On the other hand, the 1394 receiving / source packet separating means 19 of the recording device 18 receives the isochronous packet transmitted from the IEEE 1394 bus 9 by identifying its channel number. Then, the isochronous header and the CIP header of the received isochronous packet are removed to obtain a data block. Source packets are separated by combining multiple data blocks or splitting data blocks. Since the data is reproduced at double speed, the required transmission rate is 56 Mbps. In this case, the source block is obtained by dividing the data block.

The 25 MHz time stamp comparing / deleting means 20 removes the source packet header of the source packet to obtain a transport packet. Then, the transmission time stamp described in the source packet header is compared with the absolute time of 25 MHz indicated by the cycle time register, and at the timing when the transmission time stamp matches the time indicated by the cycle time register, the transport packet is transmitted. Output. The AV data output from the 25 MHz time stamp comparing / deleting means 20 is the same as that of FIG.
As shown in (2), the time interval is equal to the transport packet of the transport stream shown by (2).

When playing back at double speed, the PC
No processing is performed by the R extraction / 27 MHz reproduction means 22 and the 27 MHz time stamp addition means 23.

In the AV data before being input to the K-times stream recording means 25, the time stamp added at the time of reproduction remains as it is, as shown in FIG.

The K-times stream recording means 25 leaves the time stamp added during reproduction as it is,
The MPEG2 transport stream is converted into a format to be recorded on the recording medium 26.

The recording means 26 records AV data.

In this way, the AV data is dubbed at double speed. The recording device 18 retains the time stamp added before reproduction by the reproduction device 10 as it is.
It is recorded in. For this reason, since it has the correct time stamp, it can be reproduced and viewed at 1 × speed.

In the present embodiment, the case where dubbing is performed at 1 × speed and the case where dubbing is performed at 2 × speed are described, but the present invention is not limited to this. Dubbing may be performed at any speed. However, when dubbing at an arbitrary speed, the same processing as in the case of dubbing at twice the speed described in the present embodiment is performed.

Further, in the present embodiment, when dubbing at a speed of 1 ×, AV data is processed while synchronizing using a time stamp and a transmission time stamp, but the present invention is not limited to this. In the case of dubbing at 1 × speed, the same processing as in the case of dubbing at 2 × speed described in the present embodiment may be performed.

(Second Embodiment) Next, a second embodiment will be described.

In the present embodiment, a case will be described in which a copy of AV data is created (dubbed) at a speed of K times speed (K is a number of 1 or more) as in the first embodiment.

FIG. 1 is a block diagram showing a configuration of the reproducing apparatus 10 and the recording apparatus 18 according to the present embodiment.

The following description focuses on the differences from the first embodiment.

When dubbing at 1 × speed, the first
The description is omitted because it is the same as that of the first embodiment.

When dubbing at a speed other than 1x speed,
Unlike the first embodiment, the changeover switch 16 has two switches.
Without passing through the 5MH time stamp adding means 15, the isochronous packet generation / 1394 transmitting means 17
Control the flow of data as it passes. The changeover switch 21 controls the flow of data so as not to pass through the 25 MHz time stamp comparing / deleting means 20.

The recording means 11, the K-speed stream reproducing means 12, the 27 MHz time stamp comparing / deleting means 13, and the changeover switch 14 of the present embodiment are examples of the reproducing means of the present invention. The time stamp adding means 15, the changeover switch 16, and the isochronous packet generating means 17 are examples of the transmitting means of the present invention.
1394 reception / source packet separation means 19, 25 MH
z time stamp comparing / deleting means 20, changeover switch 2
Reference numeral 1 denotes an example of a receiving unit according to the present invention.
The R extracting / 27 MHz reproducing means 22, the 27 MHz time stamp adding means 23, the changeover switch 24, the K-speed stream recording means 25, and the recording means 26 are examples of the recording means of the present invention.

Next, the operation of the present embodiment will be described focusing on differences from the first embodiment.

In this embodiment, the operation when K = 2, that is, when dubbing at double speed, will be described.

FIG. 4 shows a case where reproduction is performed at double speed.
6 is a time chart showing AV data at each of locations 1 to 6 shown in FIG. 1. FIG. 2 shows a time chart assuming that the time elapses from the past to the future from the left side to the right side of the page.

First, before transmitting the AV data, the reproducing apparatus 10 obtains the channel number and the bandwidth required for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Further, the acquired channel number is notified to the recording device 37 using the asynchronous transmission.

The K-speed stream reproducing means 12 converts the format of the AV data reproduced by the recording means 11 and outputs an MPEG2 transport stream.

The AV data output from the K-times stream reproduction means 12 is shown in FIG. 27MH of 1 in FIG.
As shown in the z-based time stamp 27, a time stamp is added to the head of the transport packet.

Unlike the first embodiment, the MPEG2 transport stream output from the K-times speed stream reproducing means 12 has a 27 MHz time stamp comparison and
Deletion means 13 and 25 MHz time stamp addition means 15
Generation of isochronous packets directly without passing through
4 sent to the transmission means 17.

The AV data at the locations indicated by 2 and 3 in FIG. 1 are as shown in 2 and 3 in FIG. That is, the time stamp 27 based on the 27 MHz, which is the time stamp, is still added.

The isochronous packet generation / 1394 transmission means 17 adds a source packet header to a transport packet to create a source packet, or creates a source packet without adding a source packet header. However, when a source packet header is added, an area for describing a transmission time stamp is provided in the source packet header, and an invalid value such as setting all bits to 0 is written in this area. One source packet is divided into a plurality of pieces, or a plurality of source packets are combined, and then a CIP header and an isochronous header are added to create an isochronous packet, which is transmitted to the IEEE 1394 bus 9.

In the AV data from the isochronous packet generation / 1394 transmission means 17, an isochronous packet 30 is output at every 125 microsecond isochronous period as shown in FIG. MPEG
2 The transmission rate of the transport stream is 28 Mbp
s. In this case, since the reproduction is performed at the double speed, the required transmission rate is 56 Mbps. When two transport packets are combined and transmitted per isochronous, the transmission rate becomes 24 Mbps. When three transport packets are combined and transmitted per isochronous, the transmission rate is 36.
Mbps. Therefore, since reproduction is performed at double speed, the required transmission rate is 56 Mbps, and a maximum of six transport packets are combined and transmitted per isochronous cycle.

[0170] In this way, the playback device 10 is
The reproduced AV data is transmitted to the E1394 bus 9 as an isochronous packet.

On the other hand, the 1394 receiving / source packet separating means 19 of the recording device 18 receives the isochronous packet transmitted from the IEEE 1394 bus 9 by identifying its channel number. Then, the isochronous header and the CIP header of the received isochronous packet are removed to obtain a data block. Source packets are separated by combining multiple data blocks or splitting data blocks. Since the data is reproduced at double speed, the required transmission rate is 56 Mbps. In this case, the source block is obtained by dividing the data block. Further, when the source packet header is added, the transport packet is output after removing the source packet header.

1394 receiving / source packet separating means 1
Unlike the first embodiment, the MPEG-2 transport stream output from the MPEG-2 stream 9 is directly transmitted without passing through the 25 MHz time stamp comparing / deleting unit 20, the PCR extracting / 27 MHz reproducing unit 22, and the 27 MHz time stamp adding unit 13. It is passed to the K-speed stream recording means 25.

That is, the recording device 18 ignores the transmission time stamp and further leaves the time stamp when the AV data was reproduced.

In the AV data before being input to the K-times stream recording means 25, the time stamp added at the time of reproduction remains as it is, as shown in FIG.

The K-times stream recording means 25 leaves the time stamp added during reproduction as it is,
The MPEG2 transport stream is converted into a format to be recorded on the recording medium 26.

The recording means 26 records the AV data.

In this way, the AV data is dubbed at double speed. Dubbing is performed while leaving the time stamp added during playback. Therefore, since the correct time stamp is added, the dubbed AV data can be reproduced and viewed at 1 × speed.

In this embodiment, the case where dubbing is performed at double speed is shown, but the present invention is not limited to this. Dubbing may be performed at any speed. However, when dubbing at an arbitrary speed, the same processing as in the case of dubbing at twice the speed described in the present embodiment is performed.

Furthermore, in the present embodiment, when dubbing at 1 × speed, the AV data is processed while synchronizing using the PTS and the transmission time stamp, but the present invention is not limited to this. In the case of dubbing at 1 × speed, the same processing as in the case of dubbing at 2 × speed described in the present embodiment may be performed.

Further, in this embodiment, the transmission of the AV data from the reproducing apparatus 10 to the recording
Although the transmission method according to 394 is used, the transmission method is not limited to this, and any transmission method such as Ethernet can be used as long as the transmission method can transmit the MPEG2 transport stream at K-times speed.

(Third Embodiment) Next, a third embodiment will be described.

In this embodiment, a case where dubbing is performed at M-times speed (M is an integer of 1 or more) will be described. In the present embodiment, AV data to be dubbed at M-times speed is transmitted using M isochronous channels.

FIG. 5 shows the structure of the reproducing device 32 and the recording device 37 of the present embodiment.

In the present embodiment, a description will be given focusing on differences from the first embodiment.

The reproducing apparatus 32 of this embodiment differs from the reproducing apparatus 10 of the first embodiment in that the packet M dividing means 34 and the M isochronous packet generating means 3
5a to 5m, in that Mch1394 transmission means 36 is provided. The M-times stream reproduction means 33 has the same function as the K-times stream reproduction means 12 in the first embodiment, although the name is different.

The difference between the recording device 37 of the present embodiment and the recording device 18 of the first embodiment is that the Mch1
394 receiving means 38, M source packet separating means 3
9a-m, M 25 MHz time stamp comparing / deleting means 20a-20c, M changeover switches 21a-m,
The point is that a packet combining means 41 is provided. The M-times stream recording means 40 has the same function as the K-times stream recording means 25 of the first embodiment, although the name is different.

The changeover switch 16 is a changeover switch for switching the processing of the time stamp when transmitting the isochronous packet to the IEEE 1394 bus 9, and in the present embodiment, the 25 MHz time stamp adding means 15 is always used.
Is set so that the AV data is passed to the packet M dividing means 34 from.

The packet M dividing means 34 is a means for distributing a source packet to M channels for transmitting a source packet. The isochronous packet generating means 35a to 35m are means for generating isochronous packets to be transmitted on each channel.

[0189] The Mch1394 transmission means 36 uses the M channels to convert the isochronous packet to the IEEE.
This is a means for transmitting to the 1394 bus 9.

The Mch1394 receiving means 38 is a means for receiving isochronous packets sent from M channels.

The source packet separating means 39a to 39m
This is a means for separating a source packet for each channel from a plurality of channels.

The 25 MHz time stamp comparing / deleting means 20 a to 20 m removes the source packet header for each channel, and uses the transmission time stamp in the removed source packet header and the 25 MHz frequency indicated by the cycle time register. This is a means for comparing the absolute time to be counted up and outputting a transport packet at a timing when the transmission time stamp matches the time indicated by the cycle time register.

The changeover switches 21a to 21m are switches for controlling the processing method of the transmission time stamp. In this embodiment, the processing is always performed from the 25 MHz time stamp comparison / deletion means 20a to m to the packet combining means 41. It is set to move.

The packet combining means 41 combines the M transport packets into one, and
This is a means for outputting a PEG2 transport stream.

Note that the recording means 11, the M-times speed stream reproducing means 33, the 27 MHz time stamp comparing / deleting means 13, and the changeover switch 14 of the present embodiment are examples of the reproducing means of the present invention. Time stamp adding means 15, changeover switch 16, packet M dividing means 34, isochronous packet generating means 35a to
m, Mch1394 transmitting means 36 is an example of the transmitting means of the present invention, and includes Mch1394 receiving means 38, source packet separating means 39a-m, 25 MHz time stamp comparing / deleting means 20a-m, changeover switches 21a-m, packet combining means Reference numeral 41 denotes an example of the receiving means of the present invention, and the PCR extracting / 27 MHz reproducing means 22, 27 of the present embodiment.
MHz time stamp adding means 23, changeover switch 2
4. The M-times stream recording means 40 and the recording means 26 are examples of the recording means of the present invention.

Next, the operation of the present embodiment will be described focusing on differences from the first embodiment.

In the present embodiment, a case where M is dubbed at 4, that is, at a quadruple speed will be described.

FIG. 6 shows a case in which reproduction is performed at a 4 × speed.
6 is a time chart showing AV data at each of the points 1 to 5 shown in FIG. 5. FIG. 6 shows a time chart assuming that the time elapses from the past to the future from the left side to the right side of the page.

First, before transmitting the AV data, the reproducing apparatus 32 obtains the channel number and the bandwidth necessary for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Playback device 32
Generally uses M channels for playback at M-times speed. That is, in the present embodiment, since reproduction is performed at a quadruple speed, four channels are used. Now, from the isochronous manager, a, b, c,
It is assumed that four channels of d have been acquired. Then,
Using the asynchronous transmission, the recording device 37 is notified of the acquired channel number and the order in which the channels are used.

The operation from the reading of the AV data recorded in the recording means 11 to the changeover switch 16 is the same as that of the first embodiment except that the reproduction speed is different from the case of reproducing at double speed. Are the same. That is, M
Play the PEG2 transport stream at 4x speed,
A source packet is created by adding a transmission timestamp to a transport packet while keeping the timestamp without synchronizing the timestamp and the STC.

The AV data at one point in FIG.
Shown in 6 indicates that source packets are output in this order. At the beginning of the transport packet, a time stamp is added as shown in a time stamp 27 based on 27 MHz, and in the source packet header, a time stamp for transmission is added as shown in a time stamp 28 based on 25 MHz. Have been.
In FIG. 6, T0, T1,..., T11 are transmission time stamps, and A, B, C,.

Next, the packet M dividing means 34 divides the input source packets into M channels in the order as shown in FIG.

That is, the transmission time stamp of the source packet is T0, T1, T2,.
If it is T11, the source packet is represented by its transmission time stamp, and the a channel is sequentially assigned to T1 and the T2 is assigned to T2.
, The c channel to T3, the d channel to T4, and the a channel to T5. Hereinafter, the channels are sequentially allocated to the source packets.

The result of the packet M dividing means 34 allocating the source packet to each channel is as shown in FIG. As is clear from 2 in FIG. 6, the source packet allocated to the channel a is transmitted at 1 × speed. Similarly, source packets allocated to the b, c, and d channels are also transmitted at 1 × speed.

The isochronous packet generating means 35a-
In m, a source packet is divided or a plurality of source packets are combined into a data block for each channel, and a CIP header and an isochronous header are added to the data block to generate an isochronous packet.

FIG. 6-3 shows AV data at three places in FIG. The AV data is output as an isochronous packet in this order. However, in FIG.
Source packets are often divided or combined to generate isochronous packets based on the relationship between the transmission rate of the EE1394 bus 9 and the transmission rate of the MPEG2 transport stream. However, for ease of understanding, the source packets are divided or combined. Instead, it is described that an isochronous packet is generated.

[0207] The Mch1394 transmitting means 36 transmits the isochronous packet created in this way to a, b,
IEEE1394 using four channels c and d
The data is transmitted to the bus 9. For example, in the channel a, the isochronous packets include T0, T0 as shown in FIG.
4, T8,...

Next, the operation of the recording device 37 will be described.

The Mch1394 receiving means 3 of the recording device 37
Reference numeral 8 identifies each of the channels a, b, c, and d, and receives isochronous packets transmitted from these channels. Then, the isochronous packet sent using the channel a is output to the source packet separating means 39a. Similarly, the isochronous packets transmitted using the channels b, c, and d are respectively separated from the source packet separating unit 39b, the source packet separating unit 39c, and the source packet separating unit 39.
Output to d.

The source packet separating means 39a-d
The isochronous header and the CIP header are removed from the isochronous packet for each of the channels a, b, c, and d to form a data block, and a plurality of data blocks are combined or the data block is divided to separate a source packet.

The 25 MHz time stamp comparing / deleting means a to d store the transmission time stamp for each of the channels a, b, c and d in the 25 MHz indicated by the cycle time register.
Compared with the absolute time counted at the frequency of z, the header of the source packet is removed at the timing when the transmission time stamp matches the absolute time indicated by the cycle time register, and output to the packet combining means 41 as a transport packet.

The packet synthesizing unit 41 outputs the transport packets input from the 25 MHz time stamp comparing / deleting units a to d in the input order. Thus, the MPEG2 transport packet is restored.

In this case, since the dubbing is performed at 4 × speed, the PCR extraction / 27 MHz reproducing means 22, 27 MHz
The time stamp adding means 23 does not perform any processing. That is, the time stamp is left attached.

The M-speed stream recording means 40
Converts the MPEG2 transport stream into a format for recording in the recording means 26 with the time stamp added.

Further, the recording means 26 stores the A
Record V data.

In this manner, dubbing is performed at a quadruple speed.
Although data transmission was performed using four channels, the data sorted into the four channels based on the transmission time stamps are combined into one transport stream. Time intervals can be restored correctly.

[0217] Also, it is possible to use one channel for IEEE.
Rather than transmitting data to the E1394 bus 9, transmitting data to the IEEE 1394 bus 9 using a plurality of channels can increase the transmission rate, thereby enabling high-speed dubbing.

Next, a case where M is 1, that is, a case where dubbing is performed at 1 × speed will be described.

In this case, the 1 described in the first embodiment is used.
The same operation as when dubbing at double speed is performed. That is, the packet M dividing means 34 does not divide the source packet. Further, the isochronous packet generating means 3
5a generates an isochronous packet,
The four transmitting means 36 transmits the isochronous packet using one channel.

[0220] The Mch1394 receiving means 38 receives the transmitted isochronous packet, and the source packet separating means 39a separates the source packet. 25M
The Hz time stamp comparing / deleting means 20a and the packet synthesizing means 41 perform the same operation as the 25 MHz time stamp comparing / deleting means 20 of the first embodiment. Also,
PCR extraction / 27 MHz reproducing means 22, 27 MHz time stamp adding means 23, M double speed stream recording means 4
0, the operation of the recording means 26 is the same as that of the first embodiment.

In the present embodiment, the case of dubbing at a quadruple speed has been described. However, as long as M is an integer from 1 to 64, such as 6x speed or 8x speed, dubbing can be performed at any speed. Good. Here, 64 is an IEEE
This is the total number of channels that the 1394 bus 9 can use.

Further, in the present embodiment, the playback device 32
However, it has been described that the order in which the channels for transmitting the isochronous packets are used is notified to the recording device 37 using the asynchronous transmission in advance, but the present invention is not limited to this. It is not necessary for the playback device 32 to notify the recording device 37 of the order in which the channels for transmitting the isochronous packets using the asynchronous transmission are used. In short, it is only necessary to notify which channel the isochronous packet is sent to.

(Fourth Embodiment) Next, a fourth embodiment will be described.

In this embodiment, a case where dubbing is performed at M-times speed (M is an integer of 1 or more) as in the third embodiment will be described. In the present embodiment, A for dubbing at M times speed
V data is transmitted using M channels.

FIG. 5 shows the structure of the reproducing device 32 and the recording device 37 of the present embodiment.

The playback device 32 and the recording device 3 of the present embodiment
7 is the same as in the third embodiment.

However, in the present embodiment, except for the case of dubbing at 1 × speed, the changeover switch 16 is
The data flow is controlled so that the AV data is passed to the packet M dividing means 34 without passing through the 5MH time stamp adding means 15.

Except when dubbing at 1 × speed, the changeover switches 21a to 21m do not always pass through the 25 MHz time stamp comparing / deleting means 20a to 20m, and the source packet separating means 39a to m to the packet synthesizing means 41
Is set so that the processing is shifted to.

The packet combining means 41 combines the M number of transport packets into one, and
This is a means for outputting a PEG2 transport stream.

The recording means 11, the M-times speed stream reproducing means 33, the 27 MHz time stamp comparing / deleting means 13, and the changeover switch 14 of the present embodiment are examples of the reproducing means of the present invention. Time stamp adding means 15, changeover switch 16, packet M dividing means 34, isochronous packet generating means 35a to
m, Mch1394 transmitting means 36 is an example of the transmitting means of the present invention, and includes Mch1394 receiving means 38, source packet separating means 39a-m, 25 MHz time stamp comparing / deleting means 20a-m, changeover switches 21a-m, packet combining means Reference numeral 41 denotes an example of the receiving means of the present invention, and the PCR extracting / 27 MHz reproducing means 22, 27 of the present embodiment.
MHz time stamp adding means 23, changeover switch 2
4. The M-times stream recording means 40 and the recording means 26 are examples of the recording means of the present invention.

Next, the operation of the present embodiment will be described focusing on differences from the first embodiment.

In the present embodiment, the case where M is dubbed at 4, that is, at a quadruple speed will be described.

FIG. 7 shows a case in which reproduction is performed at a quadruple speed.
6 is a time chart showing AV data at each of the points 1 to 5 shown in FIG. 5. FIG. 7 shows a time chart assuming that the time elapses from the past to the future from the left side to the right side of the page.

First, before transmitting the AV data, the reproducing device 32 obtains the channel number and the bandwidth required for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Playback device 32
Generally uses M channels for playback at M-times speed. That is, in the present embodiment, since reproduction is performed at a quadruple speed, four channels are used. Now, from the isochronous manager, a, b, c,
It is assumed that four channels of d have been acquired. Then,
Using the asynchronous transmission, the recording device 37 is notified of the acquired channel number and the order in which the channels are used.

The operation from the reading of the AV data recorded in the recording means 11 to the changeover switch 16 is different from the case of reproducing at double speed of the second embodiment, except that the reproducing speed is different. Are the same. That is, M
Play the PEG2 transport stream at 4x speed,
A source packet is created without synchronizing the time stamp with the STC, leaving the time stamp, and without adding a transmission time stamp to the transport packet.

The AV data at one point in FIG.
Shown in 7 indicates that the source packets are output in this order. As shown by a time stamp 27 based on 27 MHz, a time stamp is added to the head of the transport packet. Invalid data is added to the source packet header, such as recording 0 in all bits, or the source packet header is not added. 7, T0, T1,... T11
Is a time stamp, and A, B, C... L are transport packets. In the figure, the time stamp is added outside the transport packet, and one time stamp is added to one transport packet. However, in order to facilitate understanding, In the present embodiment, a time stamp need not always be added to the beginning of a transport packet, and it is sufficient that a time stamp is added to at least a transport packet in which a PCR is inserted.

Next, the packet M dividing means 34 divides the input source packets into M channels in the order as shown in FIG.

That is, the transport packet is
L, the source packet is represented by its transport packet, A channel is assigned to A, b channel is assigned to B, and c channel is assigned to C. Is assigned to D channel and further to E channel a. Hereinafter, channels are assigned to source packets in this order.

The result obtained by the packet M dividing means 34 allocating the source packets to the respective channels is as shown in FIG. As is clear from 2 in FIG. 7, similarly to the third embodiment, the source packets distributed to the channel a are transmitted at 1 × speed. Similarly, source packets allocated to the b, c, and d channels are also transmitted at 1 × speed.

The isochronous packet generating means 35a-
In m, a source packet is divided or a plurality of source packets are combined into a data block for each channel, and a CIP header and an isochronous header are added to the data block to generate an isochronous packet.

FIG. 7-3 shows the AV data at three points in FIG. The AV data is output as an isochronous packet in this order. However, in 3 of FIG. 7, the IE is actually
Source packets are often divided or combined to generate isochronous packets based on the relationship between the transmission rate of the EE1394 bus 9 and the transmission rate of the MPEG2 transport stream. However, for ease of understanding, the source packets are divided or combined. Instead, an isochronous packet is generated schematically.

The Mch1394 transmitting means 36 transmits the isochronous packet created in this way to a, b,
IEEE1394 using four channels c and d
The data is transmitted to the bus 9. For example, in the channel a, the isochronous packets include T0, T0 as shown in FIG.
4, T8,...

The Mch1394 transmitting means 36 transmits an a-channel isochronous packet in one isochronous cycle, then transmits a b-channel isochronous packet, and then transmits a c-channel isochronous packet. Then, the d-channel isochronous packet is transmitted. As described above, isochronous packets are transmitted in the order of a, b, c, and d channels in one isochronous cycle.

Next, the operation of the recording device 37 will be described.

The Mch1394 receiving means 3 of the recording device 37
Reference numeral 8 identifies each of the channels a, b, c, and d, and receives isochronous packets transmitted from these channels. Then, the isochronous packet sent using the channel a is output to the source packet separating means 39a. Similarly, the isochronous packets transmitted using the channels b, c, and d are respectively separated from the source packet separating unit 39b, the source packet separating unit 39c, and the source packet separating unit 39.
Output to d.

The source packet separation means 39a-d
The isochronous header and the CIP header are removed from the isochronous packet for each of the channels a, b, c, and d to form a data block, and a plurality of data blocks are combined or the data block is divided to separate a source packet. Further, the transport packet is restored by removing the source packet header.

Since the transmission time stamp is invalid data, the 25 MHz time stamp comparison / deletion means a to
In d, the process proceeds to the packet combining means 41 without performing the process.

The packet combining means 41 restores the order of the transport packets based on the rule for allocating source packets to channels and the rule that isochronous packets are transmitted in the order of a, b, c, and d in one isochronous cycle. Output. Thus, the MPEG2 transport stream is restored.

In this case, since dubbing is performed at 4 × speed, the PCR extraction / 27 MHz reproducing means 22, 27 MHz
The time stamp adding means 23 performs processing. That is, the time stamp is left attached.

Then, the M-times speed stream recording means 40
Converts the MPEG2 transport stream into a format for recording in the recording means 26 with the time stamp added.

Further, the recording means 26 stores the A
Record V data.

When dubbing at 4 × speed in this way, data transmission was performed using four channels. The rules for allocating transport packets to each channel and the order for determining the channels for transmitting isochronous packets were determined. Since the transport packets are combined into one transport stream based on the rule of
The order of the transport packets can be correctly restored.

[0253] Also, using one channel, IEEE
Rather than transmitting data to the E1394 bus 9, transmitting data to the IEEE 1394 bus 9 using a plurality of channels can increase the transmission rate, thereby enabling high-speed dubbing.

Next, the case where M is 1, that is, the case of dubbing at 1 × speed will be described.

In this case, the 1 described in the first embodiment is used.
The same operation as when dubbing at double speed is performed. That is, the packet M dividing means 34 does not divide the source packet. Further, the isochronous packet generating means 3
5a generates an isochronous packet,
The four transmitting means 36 transmits the isochronous packet using one channel.

The Mch1394 receiving means 38 receives the transmitted isochronous packet, and the source packet separating means 39a separates the source packet. 25M
The Hz time stamp comparing / deleting means 20a and the packet synthesizing means 41 perform the same operation as the 25 MHz time stamp comparing / deleting means 20 of the first embodiment. Also,
PCR extraction / 27 MHz reproducing means 22, 27 MHz time stamp adding means 23, M double speed stream recording means 4
0, the operation of the recording means 26 is the same as that of the first embodiment.

In this embodiment, the case where dubbing is performed at a quadruple speed is described. However, as long as M is an integer from 1 to 64, such as 6x speed or 8x speed, dubbing can be performed at any speed. Good. Here, 64 is an IEEE
This is the total number of channels that the 1394 bus 9 can use.

Further, in the present embodiment, the playback device 10
IEEE standard for transmitting AV data from the
Although the transmission method according to 1394 is used, the transmission method is not limited to this, and any transmission method such as Ethernet can be used as long as the transmission method can transmit the MPEG2 transport stream at M-times speed.

(Fifth Embodiment) Next, a fifth embodiment will be described.

In the present embodiment, M is added to the fourth embodiment.
The case of dubbing at double speed (M is an integer of 1 or more) will be described. In the present embodiment, AV data to be dubbed at M-times speed is transmitted using M channels.

FIG. 5 shows the structure of the reproducing device 32 and the recording device 37 of the present embodiment.

[0262] The playback device 32 and the recording device 3 of the present embodiment.
7 is the same as in the fourth embodiment.

However, in the present embodiment, unlike the fourth embodiment, it is assumed that all transport packets of the AV data recorded in the recording means 11 have time stamps.

Next, the operation of this embodiment will be described focusing on the differences from the fourth embodiment.

In the present embodiment, the case where M is 4, ie, dubbing at quadruple speed, as in the fourth embodiment, will be described.

FIG. 7 shows a case in which reproduction is performed at a quadruple speed.
6 is a time chart showing AV data at each of the points 1 to 5 shown in FIG. 5.

First, before transmitting the AV data, the reproducing device 32 notifies the recording device 37 of the obtained channel number using asynchronous transmission. In the present embodiment, unlike the fourth embodiment, the recording device 37 is not notified in which order the channels are used.

After reading the AV data recorded in the recording means 11, the Mch1394 transmitting means 36
The operation up to transmission of the isochronous packet to the EE1394 bus 9 is the same as that of the fourth embodiment.

The AV data at one point in FIG.
Shown in 7 indicates that the source packets are output in this order. As shown by a time stamp 27 based on 27 MHz, a time stamp is added to the head of the transport packet. In the present embodiment, a time stamp is always added to all transport packets.

Next, the operation of the recording device 37 will be described.

The Mch1394 receiving means 3 of the recording device 37
8 identifies the channels a, b, c, and d, receives the isochronous packets sent from these channels, and operates up to the source packet separation 39a to 39d in the same manner as in the fourth embodiment. It is.

In this embodiment, the recording device 37 is not notified in which order the channels are used. Therefore, the packet combining means 41 restores the MPEG2 transport stream by referring to the time stamp added to the transport packet and outputting the transport packet in the order of the count value indicated by the time stamp.

[0273] A procedure in which the packet synthesizing means 41 restores the MPEG2 transport stream with reference to the time stamp added to the transport packet will be described below.

The transport packets reproduced by the reproducing device 32 are arranged in the order as shown in FIG. That is, the transport packets are A, B,
Are arranged in the order of C,..., And time stamps T0, T1, T2,.

Each of such transport packets is distributed to each of the channels a, b, c, and d and transmitted as shown in FIG. However, the recording device 37 does not know the order in which the transport packets are distributed to each channel.

In the source packet separations 39a to 39d, FIG.
A transport packet is temporarily stored as shown in FIG.

In this state, the packet synthesizing means 41 first reads the time stamp added to the transport packet of any one of the channels, and initializes it to T (step 1).

For example, the time stamp of the transport packet at the head of the buffer of channel a is read. That is, T = T4. At the same time, the transport packet E is output.

Further, the time stamp of the transport packet at the head of the buffer of the next channel is compared with T, and if T is smaller, the transport packet is output. T is updated with the read time stamp value (step 2).

For example, the channel b is read. T = T4
<T5, the transport packet F is output, and T
= T5.

If T is larger, the rate packet is discarded and discarded, and the time stamp of the first transport packet in the buffer of the next channel is read. This process is repeated until the packet does not become a rate packet (step 3).

For example, the channel c is read. T = T5
Since> T2, the transport packet C is discarded.
Subsequently, the channel c is read. Since T = T5 <T6, the transport packet G is output, and T = T6.

Steps 2 and 3 are repeated for four channels.

The output order is E, F, G, H,
.. And the transport packets are output in the same order as shown in 1 of FIG.

[0285] However, although the first few packets are discarded, there is no problem if the head of the AV data is slightly cut off during dubbing.

The subsequent operation is the same as in the fourth embodiment.

(Sixth Embodiment) Next, a sixth embodiment will be described.

In the present embodiment, when N = K * M (K and M are integers of 1 or more) and dubbing is performed at N times speed,
A case will be described in which transmission is performed at K times speed per one channel using the number of channels.

FIG. 5 shows the structure of the reproducing device 32 and the recording device 37 of the present embodiment.

The playback device 32 and the recording device 3 of the present embodiment
The configuration of 7 is the same as that of the third embodiment.

It should be noted that the recording means 11, the M-speed stream reproducing means 33, the 27 MHz time stamp comparing / deleting means 13, and the changeover switch 14 of the present embodiment are examples of the reproducing means of the present invention. Time stamp adding means 15, changeover switch 16, packet M dividing means 34, isochronous packet generating means 35a to
m, Mch1394 transmitting means 36 is an example of the transmitting means of the present invention, and includes Mch1394 receiving means 38, source packet separating means 39a-m, 25 MHz time stamp comparing / deleting means 20a-m, changeover switches 21a-m, packet combining means Reference numeral 41 denotes an example of the receiving means of the present invention, and the PCR extracting / 27 MHz reproducing means 22, 27 of the present embodiment.
MHz time stamp adding means 23, changeover switch 2
4. The M-times stream recording means 40 and the recording means 26 are examples of the recording means of the present invention.

Next, the operation of this embodiment will be described only with respect to differences from the third embodiment.

First, before transmitting the AV data, the reproducing device 32 obtains the channel number and the bandwidth required for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Playback device 32
In general, when reproduction is performed at N times speed, M channels are used, and transmission is performed at K times speed per channel. Here, N = M * K. In the present embodiment, it is assumed that dubbing is performed at an 8 × speed, four channels are used, and transmission is performed at a 2 × speed per channel. Now, a from isochronous manager,
It is assumed that four channels b, c, and d have been acquired. Then, using the asynchronous transmission, the recording device 37 is used.
, The acquired channel number and the order in which the channels are used are notified.

After reproducing the AV data of the recording means 11 at an 8 × speed, the same as in the third embodiment, Mc
The h1394 transmitting means 36 transmits the isochronous packet using four channels a, b, c, and d. The transmission rate is twice as fast.

Next, the operation of the recording device 37 will be described.

The Mch1394 receiving means 3 of the recording device 37
Reference numeral 8 identifies each of the channels a, b, c, and d, and receives isochronous packets transmitted from these channels. At this time, the transmission rate of each channel is a double speed. Otherwise, in the same manner as in the third embodiment, AV data is recorded on the tape medium of the recording means 26.

In the present embodiment, the case where dubbing is performed at an 8 × speed and four channels are used and the transmission speed of each channel is a 2 × speed has been described.
In the case of dubbing at a 16-times speed, eight channels are used, and the transmission speed per channel is 2 times, etc. In short, N = M * K (where N, M, and K are 1
When the relationship (the above integer) holds, dubbing is performed at N times speed, M channels are used, and transmission is performed at K times speed per channel.

As described above, according to the present embodiment, higher-speed dubbing becomes possible because transmission is performed using a plurality of channels.

(Seventh Embodiment) Next, a seventh embodiment will be described.

In the present embodiment, when N = K * M (K and M are integers of 1 or more) and dubbing is performed at N times speed, M
A case will be described in which transmission is performed at K times speed per one channel using the number of channels.

FIG. 5 shows the configuration of the reproducing device 32 and the recording device 37 of the present embodiment.

[0302] The playback device 32 and the recording device 3 of the present embodiment.
The configuration of 7 is the same as that of the fourth embodiment.

Note that the recording means 11, the M-times speed stream reproducing means 33, the 27 MHz time stamp comparing / deleting means 13, and the changeover switch 14 of the present embodiment are examples of the reproducing means of the present invention, and the 25 MHz of the present embodiment is used. Time stamp adding means 15, changeover switch 16, packet M dividing means 34, isochronous packet generating means 35a to
m, Mch1394 transmitting means 36 is an example of the transmitting means of the present invention, and includes Mch1394 receiving means 38, source packet separating means 39a-m, 25 MHz time stamp comparing / deleting means 20a-m, changeover switches 21a-m, packet combining means Reference numeral 41 denotes an example of the receiving means of the present invention, and the PCR extracting / 27 MHz reproducing means 22, 27 of the present embodiment.
MHz time stamp adding means 23, changeover switch 2
4. The M-times stream recording means 40 and the recording means 26 are examples of the recording means of the present invention.

Next, the operation of this embodiment will be described only with respect to differences from the fourth embodiment.

First, prior to transmitting the AV data, the reproducing device 32 acquires the channel number and the bandwidth required for transmitting the AV data from the isochronous manager of the IEEE 1394 bus 9. Playback device 32
In general, when reproduction is performed at N times speed, M channels are used, and transmission is performed at K times speed per channel. Here, N = M * K. In the present embodiment, it is assumed that dubbing is performed at an 8 × speed, four channels are used, and transmission is performed at a 2 × speed per channel. Now, a from isochronous manager,
It is assumed that four channels b, c, and d have been acquired. Then, using the asynchronous transmission, the recording device 37 is used.
, The acquired channel number and the order in which the channels are used are notified.

After the AV data of the recording means 11 is reproduced at an 8 × speed, the Mc data is reproduced in the same manner as in the fourth embodiment.
The h1394 transmitting means 36 transmits the isochronous packet using four channels a, b, c, and d. The transmission rate is twice as fast.

Next, the operation of the recording device 37 will be described.

The Mch1394 receiving means 3 of the recording device 37
Reference numeral 8 identifies each of the channels a, b, c, and d, and receives isochronous packets transmitted from these channels. At this time, the transmission rate of each channel is a double speed. Otherwise, the AV data is recorded on the tape medium of the recording unit 26 in the same manner as in the fourth embodiment.

In this embodiment, the case where dubbing is performed at an 8 × speed and four channels are used and the transmission speed of each channel is 2 × has been described.
In the case of dubbing at a 16-times speed, eight channels are used, and the transmission speed per channel is 2 times, etc. In short, N = M * K (where N, M, and K are 1
When the relationship (the above integer) holds, dubbing is performed at N times speed, M channels are used, and transmission is performed at K times speed per channel.

As described above, according to the present embodiment, higher-speed dubbing becomes possible because transmission is performed using a plurality of channels.

(Eighth Embodiment) Next, an eighth embodiment will be described.

In this embodiment, when dubbing at N times speed (N is an integer of 1 or more), the AV
A reproducing device and a recording device capable of confirming the contents of data will be described.

FIG. 8 shows the structure of the reproducing device 43, the recording device 49, and the STB 53 of the present embodiment.

[0314] The reproducing device 43 comprises a recording means 11, an N-speed stream reproducing means 33, an N-speed dubbing processing means 44,
1394 transmitting means 48, trick play stream extracting means 4
5, a time axis extending means 46 and an isochronous packet generating means 47.

The recording device 49 includes a 1394 receiving unit 50, an N × speed dubbing unit 51, an N × speed stream recording unit 52, and a recording unit 26.

The STB 53 is provided with the 1394 receiving unit 5.
4. It comprises MPEG-TS playback means 55 and decoding means 56.

[0317] Reproduction device 43, recording device 49, STB 53
Can exchange data and commands via the IEEE 1394 bus 9. STB53 has T
V57 is connected.

[0318] The recording means 11 of the reproducing apparatus 43 is the same as the recording means 11 of the third embodiment. The N × speed stream reproducing means 33 is the same as the M × speed stream reproducing means 33 of the third embodiment. The N-times dubbing processing means 44 includes the 27 MHz time stamp comparing / deleting means 13, the changeover switch 14, and the 25 MHz
The time stamp adding means 15, the changeover switch 16, the packet M dividing means 34, and the isochronous packet generating means 35a to m are combined into one.

Also, the trick play stream extracting means 45
Is a means for extracting a stream for trick play. The time axis expansion processing means 46 is means for changing the speed at which the special reproduction is performed by changing the time axis. The isochronous packet generation means 47 is a means for generating an isochronous packet for transmitting a stream for trick play.

The 1394 transmitting means 48 has the same function as the Mch 1394 transmitting means 36 of the third embodiment, and further transmits an isochronous packet of a trick play stream using a trick play channel. It is a means to do.

The 1394 receiving means 50 of the recording device 49
Is the same as the Mch1394 receiving means 38 of the third embodiment. The N-times speed dubbing processing unit 51 includes the source packet separating units 39a to 39m, 25M according to the third embodiment.
The frequency time stamp comparing / deleting means 20a to m, the changeover switches 21a to m, the packet combining means 41, the PCR extracting means 22, the 27 MHz time stamp adding means 23, and the changeover switch 24 are integrated into one. The N-times stream recording means 52 is the same as the M-times stream recording means 40 of the third embodiment. The recording means 26
This is the same as the recording unit 26 in the third embodiment.

The 1394 receiving means 5 of the STB 53
Reference numeral 4 denotes means for receiving an isochronous packet transmitted with the trick play stream by identifying the trick play channel.

[0323] The MPEG-TS playback means 55
2 means for restoring a transport stream.

[0324] The decoding means 56 is means for decoding the special reproduction stream and converting it into an analog signal.

[0325] The TV 57 is a television monitor, which is a means for displaying a stream for special reproduction.

Note that the recording means 11, the N-times speed stream reproducing means 33, the special reproduction stream extracting means 45, and the time axis decompression processing means 46 of the present embodiment are examples of the reproducing means of the present invention. N-speed dubbing processing means 4
4. The isochronous packet generating means 47 and the 1394 transmitting means 48 are examples of the transmitting means of the present invention, and the 1394 receiving means 50 and the N-speed dubbing processing means 51 are examples of the receiving means of the present invention. N-speed dubbing processing means 51, N-speed stream recording means 52, recording means 2
Reference numeral 6 denotes an example of a recording unit according to the present invention.
The receiving means 54, the MPEG-TS reproducing means 55, and the decoding means 56 are examples of the display means of the present invention.

Next, the operation of this embodiment will be described only with respect to differences from the third embodiment.

[0328] Before transmitting the AV data, the reproducing device 43 adds, in addition to the operations described in the third embodiment,
Further, a channel number for transmitting the special reproduction stream and a bandwidth necessary for transmitting the special reproduction stream are obtained from the isochronous manager of the IEEE 1394 bus 9.

The N × speed stream reproducing means 33 also reproduces a special reproduction stream.

[0330] The trick play stream extracting means 45 extracts a trick play stream.

[0331] The time axis extension processing means 46 extends the time axis of the special reproduction stream, and adjusts the special reproduction stream according to the dubbing speed so that the special reproduction can be performed.

FIG. 9 shows how to extend the time axis. Assuming that the trick play at the time of the normal playback is performed at 6 times speed, the trick play stream exists at a rate of about once every six frames as in the normal playback 80.

At the time of special reproduction, as shown in special reproduction 81, only this special reproduction stream is reproduced and connected, thereby enabling reproduction at 6 times speed.

When this stream is reproduced at double speed, the time axis is compressed to に as in double speed dubbing 82 and transmitted. Therefore, the special playback stream extracted from this stream has its time axis compressed to １ ／, and cannot be drawn as it is.

Therefore, the time axis decompression processing means 46 decompresses the 再生 -compressed special reproduction stream to the original time axis as shown by the special reproduction 83. with this,
It is possible to reproduce a video that is three times longer than that of the special reproduction 81, and a video that is twice as fast as that of the normal reproduction 80.

FIG. 10 shows an example of elongation of the time axis when dubbing is performed at 12 × speed. It is assumed that the special reproduction at the time of normal reproduction is performed at 6 times speed. When dubbing at 12 × speed, the time axis is compressed to に as in 12 × speed dubbing 84 and transmitted, so that the special reproduction stream is also compressed to 1/12 and transmitted.

[0337] The time axis extension processing means 46
Special playback stream compressed to / 12
It extends to the original time axis as shown in FIG.

[0338] At this time, the special reproduction stream is output once every two times.
A continuous stream is obtained by stretching at a rate of times. Normal playback 8 because it is thinned out once every two times
In comparison with the video of the normal reproduction 80, the video is twice as fast as the video of the special reproduction.
The image is turned twice at a fast speed.

In general, the speed of trick play is L times (L is 2 times).
When the dubbing speed is N times speed (N is an integer of 1 or more), and L> = N, the time axis of the special reproduction stream is extended to N times. Also, L
In the case of <N, the time axis of the trick play stream is extended N times, and the trick play stream is thinned out L / N times.

When the speed of the trick play is the L-times speed, the servo circuit can be shared by setting the dubbing speed to the L-times speed.

The isochronous packet generation means 47
An isochronous packet is generated from the trick play stream.

The 1394 transmission means 48 uses the special reproduction channel in addition to the operation of the third embodiment.
The isochronous packet of the trick play stream is transmitted.

On the other hand, the operation of the recording device 49 is the same as that of the third embodiment.

Next, the operation of STB 53 will be described.

The 1394 receiving means 54 identifies a channel for special reproduction and receives an isochronous packet to which a stream for special reproduction is transmitted.

[0347] The MPEG-TS playback means 55 restores the special playback stream to an MPEG2 transport stream.

[0347] The decoding means 56 separates and decompresses the MPEG2 transport stream and converts it into an analog signal.

[0348] The TV 57 displays the video of the special reproduction stream on the monitor.

In this way, by adjusting the time axis of the special reproduction stream, it is possible to decode the special reproduction stream while dubbing at a speed other than 1 × speed, and confirm the contents of the dubbing. I can do it.

[0350] In the present embodiment, the stream for trick play is transmitted by isochronous packets.
It may be transmitted by an asynchronous packet.

Further, in this embodiment, the special reproduction stream is reproduced and transmitted, but the present invention is not limited to this. Instead of reproducing the trick play stream, the recording apparatus may extract an I frame from the transmitted dubbing stream, create a trick play stream, and display the trick play stream on a monitor.

Furthermore, the present embodiment has been described as adding the function of performing special reproduction during dubbing to the third embodiment, but the present invention is not limited to this. In short, the function of performing the special reproduction during dubbing is added to each of the first to seventh embodiments, such as the one in which the function of performing the special reproduction during dubbing is added to the fourth embodiment. Configuration.

Furthermore, all or some of the functions of all or some of the means of the present invention may be realized by software or hardware by a computer program.

A program recording medium characterized by recording a program for causing a computer to execute all or a part of the functions of all or a part of the recording apparatus or the reproducing apparatus of the present invention is also described. Belongs to the invention.

[0355]

As is apparent from the above description, the present invention provides a reproducing apparatus, a recording apparatus, and a program recording medium capable of dubbing MPEG-compressed AV data at a speed of 1 × or more. Can be done.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a reproducing apparatus and a recording apparatus according to first and second embodiments of the present invention.

FIG. 2 shows MPEG2 according to the first embodiment of the present invention.
Time chart when dubbing the transport stream at 1x speed

FIG. 3 shows MPEG2 according to the first embodiment of the present invention.
Time chart when dubbing the transport stream at double speed

FIG. 4 shows MPEG2 according to a second embodiment of the present invention.
Time chart when dubbing the transport stream at double speed

FIG. 5 is a block diagram showing a configuration of a reproducing device and a recording device according to third to seventh embodiments of the present invention.

FIG. 6 shows MPEG2 in a third embodiment of the present invention.
Time chart when dubbing the transport stream at 4x speed

FIG. 7 shows MPEs according to fourth and fifth embodiments of the present invention.
Time chart when dubbing the G2 transport stream at 4x speed

FIG. 8 is a block diagram showing a configuration of a playback device, a recording device, and an STB according to an eighth embodiment of the present invention.

FIG. 9 is a diagram showing a method of adjusting a time axis in order to reproduce a trick play stream at a 6 × speed while dubbing at a 2 × speed in the eighth embodiment of the present invention.

FIG. 10 is a diagram showing a method of adjusting a time axis in order to reproduce a trick play stream at a 6 × speed while dubbing at a 12 × speed in the eighth embodiment of the present invention.

FIG. 11 is a diagram illustrating transport packets stored in a buffer of a source packet separating unit according to a fifth embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a conventional reproducing apparatus and a recording apparatus.

FIG. 13 is a time chart when an MPEG2 transport stream is dubbed by a conventional reproducing apparatus and a recording apparatus.

[Explanation of symbols]

Reference Signs List 9 IEEE1394 bus 10 Reproducing device 11 Recording means 12 K-speed stream reproducing means 13 27 MHz time stamp comparing / deleting means 14 Switching switch 15 25 MHz time stamp adding means 16 Switching switch 17 Isochronous packet generation / 1394 transmitting means 18 Recording device 19 1394 reception / Source packet separating means 20, 20a-m 25MHz time stamp comparing / deleting means 21, 21a-m Switching switch 22 PCR extraction / 27MHz reproducing means 23 27MHz time stamp adding means 23 24 Switching switch 25K double speed stream recording means 26 Recording means 27 Time stamp based on 27 MHz 28 Time stamp based on 25 MHz 29 Isochronous header and CIP header 30 Isochronous packet 31 27 Hz reference time stamp 32 and reproducing apparatus 33 M times speed stream reproducing unit 34 packet M dividing means 35a~m isochronous packet generator 36 Mch1394 transmitting means 37 recording device 38 Mch1394 receiving means 39a~m source packet separating means 40 M times speed stream recording means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masazumi Yamada 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shoichi Goto 1006 Okadoma Kadoma, Kadoma City Osaka Pref. Matsushita Electric Industrial Co., Ltd. 72) Inventor Hideaki Takechi 1006 Kazuma Kadoma, Kazuma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 1006 Kadoma, Kadoma Matsushita Electric Industrial Co., Ltd. MC26 RC08 SS11

Claims (43)

[Claims] 1. A reproducing means for reproducing an MPEG transport stream recorded on a recording medium at a predetermined speed together with a time stamp newly added at the time of recording, and reproducing the reproduced MPEG transport stream by the time stamp. And a transmission means for transmitting the data with a predetermined transmission method while adding the information. 2. The MPEG transport stream according to claim 1, wherein the reproduction unit reproduces the MPEG transport stream with or without observing a time indicated by the time stamp.
The playback device as described in the above. 3. The speed according to claim 1, wherein the predetermined speed is a speed of 1 × or higher.
A playback device according to claim 1. 4. The predetermined transmission method is an IEEE 13
The reproducing apparatus according to any one of claims 1 to 3, wherein the reproducing apparatus is a transmission system via a 94 bus. 5. The transmission by the IEEE 1394 bus is a transmission using an isochronous packet, and the transmission unit transmits the isochronous packet to the isochronous packet according to a time interval of the MPEG transport stream output from the reproduction unit. 5. The reproducing apparatus according to claim 4, wherein transmission is performed by adding a transmission time stamp. 6. The method according to claim 6, wherein N is K * M (K and M are integers equal to or greater than 1), wherein the predetermined speed is the N-times speed, and the transmission means converts the MPEG transport stream into an isochronous packet. 6. The reproducing apparatus according to claim 5, wherein transmission is performed using the M channels at a speed of K times per channel. 7. The transmission means uses, as an asynchronous packet, first information indicating which channel is to be used as the M channels and in which order the M channels are to be used, 7. The reproducing apparatus according to claim 6, wherein the reproduction is transmitted in advance. 8. The reproduction means reproduces or newly generates a special reproduction stream at the N-times speed, and the transmission means uses special reproduction channels other than the M channels as isochronous packets. The playback device according to claim 6, wherein the special playback stream is transmitted by using the playback device. 9. The transmission means according to claim 8, wherein said second information indicating which channel is to be used as said special reproduction channel is transmitted in advance using an asynchronous packet. The playback device according to any one of the preceding claims. 10. The reproducing apparatus according to claim 8, wherein the N is equal to the reproduction speed of the trick play. 11. The transmission using the IEEE 1394 bus is transmission using an isochronous packet, and the transmission unit transmits the isochronous packet without adding a transmission time stamp to the isochronous packet. Playback device. 12. N is K * M (K and M are integers of 1 or more)
The predetermined speed is the N-times speed, and the transmission means uses the MPEG transport stream as IEEE 1394 isochronous packets using the M channels at a K-times speed per channel. 2. The transmission according to claim 1,
The playback device according to claim 1. 13. The transmission means transmits first information indicating which channel is to be used as the M channels and in which order the M channels are to be used.
Using the asynchronous packet of EEE1394,
13. The reproducing apparatus according to claim 12, wherein the reproducing apparatus transmits the information in advance. 14. The time stamp newly added at the time of recording is added to all transport packets of the MPEG2 transport stream, and the transmission means determines which channel to use as the M channels. The first information indicating IEEE13
13. The reproducing apparatus according to claim 12, wherein the information is transmitted in advance using 94 asynchronous packets. 15. The reproduction means reproduces or newly generates a special reproduction stream at the N-times speed, and the transmission means outputs a special reproduction channel other than the M channels as an IEEE 1394 isochronous packet. 14. The playback device according to claim 12, wherein the special playback stream is transmitted by using. 16. The apparatus according to claim 1, wherein said transmitting means transmits in advance second information indicating which channel is to be used as said special reproduction channel by using an asynchronous packet of IEEE1394. Item 1
The playback device according to claim 5. 17. The reproducing apparatus according to claim 15, wherein the N is equal to a reproduction speed of the special reproduction. 18. The transmission means transmits the trick play stream to an IEEE 1394 isochronous packet instead of transmitting the trick play stream to an IEEE 1394 isochronous packet.
18. The playback device according to claim 8, wherein the playback device transmits the packet as an EE1394 asynchronous packet. 19. The reproducing apparatus according to claim 1, wherein the predetermined transmission method is transmission by Ethernet. 20. Receiving means for receiving an MPEG transport stream transmitted by the reproducing apparatus according to claim 1, and the time already added without adding a new time stamp. With the stamp as it is, the MPEG
Recording means for recording a transport stream at the predetermined speed. 21. Receiving means for receiving an isochronous packet transmitted by the reproducing apparatus according to claim 5, and outputting an MPEG transport stream while synchronizing the transmission time stamp with a cycle time. The time stamp already added is left as it is without adding a time stamp
Recording means for recording a G transport stream at the predetermined speed. 22. An IEEE 1394 isochronous packet transmitted at a rate of K times per channel by using the M channels by the reproducing apparatus according to claim 6 or 7, and the transmission time stamp is provided. Receiving means for restoring and outputting an MPEG transport stream from the isochronous packets of the M channels while synchronizing with the cycle time, and the above-mentioned already added without adding a new time stamp. With the time stamp intact, the MPE
Recording means for recording the G transport stream at N times speed. 23. The reception means, wherein the reception means receives the first information in advance, receives the isochronous packet based on the first information, and restores and outputs the MPEG transport stream. 23. The recording device according to claim 22, wherein: 24. Receiving an isochronous packet of M channels and a special reproduction channel transmitted by the reproduction apparatus according to claim 15, and synchronizing the transmission time stamp with a cycle time. Receiving means for restoring and outputting an MPEG transport stream from the M channels and the special reproduction channel, and leaving the time stamp already added as it is without adding a new time stamp. And the MPE
A recording apparatus comprising: recording means for recording a G transport stream at N times speed; and display means for decoding and displaying the trick play stream. 25. The method according to claim 25, wherein the receiving means receives the second information in advance, receives the isochronous packet based on the second information, and restores the trick play stream. Item 25. The recording device according to item 24. 26. The recording apparatus according to claim 24, wherein the N is equal to the reproduction speed of the trick play. 27. The display means, wherein the playback speed of the trick play is L, and when the relationship with the N is L <N, the time axis of the trick play stream is extended by N times, and 26. The recording apparatus according to claim 24, wherein a stream for trick play is decimated N times. 28. Receiving means for receiving an isochronous packet transmitted by the reproducing apparatus according to claim 11, and outputting an MPEG transport stream without synchronizing the transmission time stamp and the cycle time; Without adding a new time stamp, leaving the time stamp already added,
Recording means for recording a G transport stream at the predetermined speed. 29. The playback device according to claim 13, wherein
Receiving the IEEE 1394 isochronous packet transmitted at a speed of K times per channel using the number of channels, and without synchronizing the transmission time stamp with the cycle time, Receiving means for restoring an MPEG transport stream from the isochronous packet and outputting the MPEG transport stream; and adding the new time stamp to the MPE without adding a new time stamp.
Recording means for recording the G transport stream at N times speed. 30. The receiving means receives the first information in advance, receives the isochronous packet based on the first information, and restores and outputs the MPEG transport stream. Claim 2
9. The recording device according to item 9. 31. The playback apparatus according to claim 14, wherein
Receiving the IEEE 1394 isochronous packet transmitted at a speed of K times per channel using the number of channels, and without synchronizing the transmission time stamp with the cycle time, Receiving means for restoring an MPEG transport stream from the isochronous packet and outputting the MPEG transport stream; and adding the new time stamp to the MPE without adding a new time stamp.
Recording means for recording the G transport stream at N times speed. 32. The reception means receives the first information in advance, receives the isochronous packet based on the first information, and restores and outputs the MPEG transport stream. Claim 3
2. The recording device according to 1. 33. The method according to claim 33, wherein the restoration is performed by sequentially outputting, from among the isochronous packets of the M channels, those having the smaller time stamp values added thereto. Item 33. The recording device according to Item 32. 34. Receiving M isochronous packets of M channels and special reproduction channels transmitted by the reproducing apparatus according to claim 15 or 16, without synchronizing said transmission time stamp and cycle time. Receiving means for restoring and outputting an MPEG transport stream from the M channels and the trick play channel, and leaving the time stamp already added without adding a new time stamp, The MPE
A recording apparatus comprising: recording means for recording a G transport stream at N times speed; and display means for decoding and displaying the trick play stream. 35. The receiving means according to claim 35, wherein the receiving means receives the second information in advance, receives the isochronous packet based on the second information, and restores the trick play stream. Item 35. The recording device according to Item 34. 36. The recording apparatus according to claim 34, wherein the N is equal to a reproduction speed of the trick play. 37. The display means, wherein the playback speed of the trick play is L, and when the relationship with N is L <N, the time axis of the trick play stream is extended by N times, and 36. The recording apparatus according to claim 34, wherein a stream for trick play is decimated N times. 38. Receiving means for receiving an asynchronous packet transmitted by the reproducing apparatus according to claim 20, outputting a special reproduction stream as an MPEG transport stream, and adding a new time stamp without adding a new time stamp. The MPE is kept as it is with the time stamp
A recording apparatus comprising: recording means for recording a G transport stream at N times speed; and display means for decoding and displaying the trick play stream. 39. Receiving means for receiving an MPEG transport stream transmitted via the Ethernet by the reproducing apparatus according to claim 19, and said time already added without adding a new time stamp. With the stamp intact, the MPE
Recording means for recording a G transport stream at the predetermined speed. 40. The reproducing apparatus according to claim 1, wherein the time stamp is represented by 4 bytes. 41. The recording apparatus according to claim 20, wherein the time stamp is represented by 4 bytes. 42. The MPEG restored by the receiving means
11. A special reproduction data generating means for generating special reproduction data by extracting an I frame from a transport stream, and a display means for decoding and displaying the special reproduction data. 20-23, 28-
33. The recording device according to any one of claims 33. 43. A program for causing a computer to execute all or a part of functions of all or a part of the reproducing apparatus or the recording apparatus according to any one of claims 1 to 42. Program recording medium to be executed.