JP2007250037A - Dubbing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dubbing system capable of performing dubbing processing at a speed different from a normal reproduction speed. <P>SOLUTION: In a recorder 10, an isochronous packet for which a time stamp for transferring the packet sequence of MPEG-TS at a speed different from the normal reproduction speed is described in respective MPEG-TS packets is generated, and the isochronous packet is transmitted to a recorder 10 through an IEEE1394 serial bus 15. In the recorder 20, the time stamp set to each packet of the packet sequence of the MPEG-TS included in the isochronous packet received from the recorder 10 is changed to the time stamp of the normal reproduction speed, and recording is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dubbing system that performs dubbing of encoded data between apparatuses.

  In recent years, video and audio digitization in the world of video and audio information, and improvements in video and audio data compression technology have led to a rapid shift from tape recording including VTR to disk recording such as DVD disk and hard disk. Is being carried out.

  In recent years, hard disk recorders using a hard disk drive (HDD) as a recording medium have become widespread. Furthermore, hard disk & DVD hybrid recorders in which hard disk drives and DVD drives are mixed are widely used, and are used for applications in which broadcasts are temporarily recorded on a hard disk drive, and only contents to be stored are selected and dubbed to a DVD.

  However, in the case of HD (High Definition) broadcasting distributed by terrestrial digital broadcasting, BS digital broadcasting, or the like, the recording rate is usually about 15 to 25 Mbps because of high image quality. For this reason, the high-quality broadcast cannot be backed up as it is with the capacity of the DVD disc. Therefore, when it is desired to store the HD broadcast as it is, it is common to connect the recording device to an external device, perform dubbing to the external device, and perform backup.

  Usually, an IEEE (Institute of Electrical and Electronics Engineers) 1394 digital interface is used for connection between recording devices, and many recording devices capable of dubbing content through IEEE 1394 have already been released.

  However, in the conventional dubbing system, the speed of the dubbing process through IEEE 1394 is limited to the same speed as the normal playback speed. In other words, it takes the same time as the recording time to perform the dubbing processing of the recording data.

Therefore, Patent Document 1 discloses a technique related to high-speed dubbing of an encoded data string between apparatuses using a VCR and a disk-shaped recording medium. In this technique, a hard disk unit serving as a reproduction system reads an encoded data string based on an N-times speed clock frequency of normal reproduction, and a digital VCR unit serving as a recording system reads out and inputs from the reproduction system. A time stamp is added to the data string using a normal N-times speed reference clock. Then, while writing a control signal, which is a reference for the reproduction running speed of the magnetic tape, at a cycle N times the normal frequency, the magnetic tape is fed at N times normal speed and the cylinder is rotated at the same speed as normal recording. High-speed dubbing is realized by recording while recording.
JP 2002-100115 A

  However, when dubbing is performed using the technique disclosed in Patent Document 1, the transfer speed setting is limited to N times the normal playback speed (N is a positive integer). In addition, since a reference clock generation unit that generates a time stamp that is a time axis of N times the normal playback speed is required, special hardware is added, resulting in a complicated apparatus configuration. It was.

  The present invention has been made in view of the above, and an object of the present invention is to provide a dubbing system capable of performing dubbing processing at a speed different from the normal playback speed with a simple configuration.

  The dubbing system of the present invention is a dubbing system comprising a first recording device and a second recording device that performs dubbing of encoded data with the first recording device. The first recording means for recording the packet sequence of the encoded data, the first communication means for communicating with the second recording device, and the second communication means via the first communication means By exchanging information with the recording device, the range of the data transfer rate in the communication with the second recording device is examined, the data transfer rate is determined from the range of the data transfer rate, and from the determined data transfer rate, Based on the transfer interval calculated by the transfer interval calculation means, the transfer interval calculation means for calculating the transfer interval of each packet of the packet sequence of the encoded data recorded in the first recording means, the first Notation Time information for transferring the packet sequence of the encoded data recorded in the means at a rate different from the normal reproduction speed of the encoded data is described in each packet of the packet sequence, and the packet sequence is described in the first Transmission packet generating means for generating a transmission packet for transmission to the second recording apparatus via a communication means, and the second recording apparatus communicates with the first recording apparatus. Each of the second communication means for receiving the transmission packet generated by the transmission packet generation means, and the packet sequence of the encoded data included in the transmission packet received by the second communication means Time information changing means for changing the time information described in the packet by the transmission packet generating means to time information of the normal reproduction speed of the encoded data, and the time information changing means Characterized in that it comprises a second recording means for recording the packet sequence of the coded data between information changes.

  According to the dubbing system of the present invention, the first recording device generates a transmission packet describing time information for transferring a packet sequence of the recorded encoded data at a speed different from the normal reproduction speed. The transmission packet is transmitted to the second recording device. In the second recording device, the time information described in each packet of the encoded data packet sequence included in the received transmission packet is converted to the normal reproduction speed. Since the time information is changed and recorded, the packet sequence of encoded data can be transferred at a speed different from the normal playback speed, and the playback speed can be restored after the transfer. The dubbing process can be performed.

  Hereinafter, the best mode for carrying out the dubbing system of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a dubbing system according to an embodiment of the present invention. As shown in FIG. 1, the dubbing system of the present embodiment includes a recording device 10 as a dubbing source and a recording device 20 as a dubbing destination. The recording device 10 and the recording device 20 are connected to an IEEE 1394 serial bus 15. Connected through.

The recording apparatus 10 includes an input / output digital interface (I / F) unit 11, an encoded data string processing unit 12, a recording / reproducing unit 13, and a control unit 14.

  The input / output digital interface (I / F) unit 11 is composed of an IEEE 1394 digital interface, and inputs and outputs a packet sequence of encoded data via the IEEE 1394 serial bus 15.

  The encoded data sequence processing unit 12 generates a transmission packet describing time information for transferring the packet sequence of the encoded data stored in the recording / reproducing unit 13 at a speed different from the normal reproduction speed, and performs input / output digital Output to the I / F unit 11. The recording / reproducing unit 13 stores a packet sequence of encoded data.

  The control unit 14 examines the range of the data transfer rate in communication with the recording device 20 by negotiation with the recording device 20 via the input / output digital I / F unit 11 and transfers the data from the range of the data transfer rate. A speed is determined, and a transfer interval for transferring a packet sequence of encoded data to the recording device 20 is calculated from the data transfer speed. The control unit 14 controls each unit provided in the apparatus.

  The recording device 20 includes an input / output digital interface (I / F) unit 21, an encoded data string processing unit 22, a recording / reproducing unit 23, and a control unit 24.

  The input / output digital interface (I / F) unit 21 includes an IEEE 1394 digital interface, and inputs / outputs a packet sequence of encoded data via the IEEE 1394 serial bus 15.

  When the transmission packet generated by the recording device 10 is input via the input / output digital I / F unit 21, the encoded data string processing unit 22 receives time information described in the recording device 10 in the transmission packet. Is changed to time information of the normal playback speed and output to the recording / playback unit 23. The recording / reproducing unit 23 records and reproduces the packet from the encoded data string processing unit 22. The control unit 24 controls each unit provided in the apparatus.

  Next, the operation of the dubbing system according to the present embodiment and the procedure of high-speed dubbing processing will be described.

  In this embodiment, the recording apparatus 10 and the recording apparatus 20 communicate and record MPEG-TS (Moving Picture Experts Group-Transport Stream) packets via the IEEE 1394 serial bus 15.

  FIG. 2 is a flowchart showing a procedure of an encoded data string output process in the recording apparatus 10 when dubbing is performed. The processing procedure will be described below.

  First, in step S110, the control unit 14 of the recording apparatus 10 communicates with the recording apparatus 20 that is a connection partner via the input / output digital I / F unit 11 to transfer an MPEG-TS packet sequence. The range of the data transfer rate allowed between the recording device 10 and the recording device 20 is examined. The range of the transfer speed is determined by negotiation with the recording apparatus 20 via the input / output digital I / F unit 11.

  Next, in step S120, the control unit 14 determines the data transfer rate in the dubbing process from the range of the data transfer rate determined in step S110.

  Next, in step S130, the control unit 14 calculates an MPEG-TS packet transfer interval based on the data transfer rate determined in step S120 and the size of the MPEG-TS packet to be transferred.

  Next, in step S140, the control unit 14 generates an isochronous packet for transmitting data by IEEE 1394 from the MPEG-TS packet sequence recorded in the recording / reproducing unit 13 so as to generate an encoded data sequence processing unit. 12 is controlled.

  FIG. 3A is a diagram showing a format of an isochronous packet, and FIG. 3B is a diagram showing an MPEG-TS packet in the isochronous packet. As shown in FIG. 3A, the isochronous packet includes an isochronous packet header 31 and MPEG-TS packets 32a, 32b,. The MPEG-TS packets 32a, 32b,... Are provided with an SPH unit 321 that can describe time information, as shown in FIG.

  When the isochronous packet is generated, the encoded data sequence processing unit 12 sends the time to the SPH unit 321 of each MPEG-TS packet 32a, 32b,... Based on the MPEG-TS packet transfer interval calculated in step S130. Describes a time stamp indicating information.

  Then, the control unit 14 controls the input / output digital I / F unit 11 to output the isochronous packet created by the encoded data string processing unit 12 to the recording device 20 at the data transfer rate determined in step S120. .

  Next, in step S150, the control unit 14 determines whether or not the output of the packet sequence of the MPEG-TS to be dubbed recorded in the recording / reproducing unit 13 is completed, and if the output is completed (YES) Then, the encoded data string output process is terminated. If the output is not completed (NO), the process returns to step S140 and the subsequent processing is repeated. The above is the procedure of the encoded data string output process.

  FIG. 4 is a flowchart showing the procedure of the encoded data string input process in the recording apparatus 20 when dubbing is performed. The processing procedure will be described below.

  First, in step S210, when the control unit 24 of the recording device 20 receives an isochronous packet from the recording device 10 that is a connection partner in the input / output digital I / F unit 21, the received isochronous packet is encoded data sequence processing unit 22. Control to output to. The isochronous packet received here has the format shown in FIG. 3A, but the isochronous packet header 31 is unnecessary for recording.

  Therefore, in step S220, the control unit 24 controls the encoded data sequence processing unit 22 so as to remove the isochronous packet header 31 from the received isochronous packet.

  Here, although the time stamp of the packet is described in the SPH part 321 of the MPEG-TS packet shown in FIG. 3B, the step of the flowchart shown in FIG. In S140, the time stamp value is converted.

  Therefore, in step S230, the control unit 24 controls the encoded data string processing unit 22 so as to change the time stamp value in accordance with the normal reproduction speed of the MPEG-TS.

In step S240, the control unit 24 performs control so that the MPEG-TS packet whose time stamp has been changed by the encoded data sequence processing unit 22 is recorded in the recording / reproducing unit 23.

  Here, the setting of the time stamp in step S140 and the change of the time stamp in step S230 will be described with reference to FIG. FIG. 5A is a diagram illustrating the timing of the original MPEG-TS packet, and FIG. 5B is a diagram illustrating the timing of the MPEG-TS packet after the time stamp value is converted for high-speed dubbing in step S140. FIG. 5C shows the timing of the MPEG-TS packet after the time stamp of the MPEG-TS packet sent from the external device is changed in step S230.

  In MPEG-TS, in addition to the time stamp of the header part attached to the head of each MPEG-TS packet such as SPH, it is called PCR (Program Clock Reference) in the MPEG-TS packet. A time stamp value is described. As shown in FIGS. 5A to 5C, the MPEG-TS includes packets 5a, 5b,... Having this PCR and packets 6a, 6b,.

  In MPEG-TS, the normal playback speed of the program is indicated by the PCR value. That is, if the timing of the packets 5a, 5b,... With PCR is equal, the normal playback speed of the program is restored.

  Therefore, during high-speed dubbing, the time stamp described in the SPH part 321 of each MPEG-TS packet 32a, 32b,... In step S140 in FIG. Set the interval to be shorter. Thereby, the data transfer speed can be made faster than the normal reproduction speed of MPEG-TS. Further, the data transfer rate can be set to an arbitrary rate within the range of the data transfer rate checked in step S110 by setting the time stamp value.

  Then, when the recording apparatus 20 receives the MPEG-TS in which the time stamp value is converted in this way, as shown in FIG. 5C, the interval between the packets 5a, 5b,. In step S230, the time stamp of the MPEG-TS packet is changed so as to be equal to the interval between the packets 5a, 5b,... Having the PCR shown in (a). As a result, the normal playback speed of the program is restored.

  As described above, according to the present embodiment, in the recording apparatus 10, an isochronous packet in which a time stamp for transferring an MPEG-TS packet sequence at a speed different from the normal reproduction speed is set in each MPEG-TS packet. And the isochronous packet is transmitted to the recording device 20 via the IEEE 1394 serial bus 15, and the recording device 20 transmits the isochronous packet to each packet of the MPEG-TS packet sequence included in the isochronous packet received from the recording device 10. Since the set time stamp is changed to the normal playback speed time stamp and recorded, the transfer rate of the MPEG-TS packet sequence can be set to a speed different from the normal playback speed. The dubbing process can be performed at a speed different from the playback speed.

It is a block diagram which shows the structure of the dubbing system which concerns on one embodiment of this invention. It is a flowchart which shows the procedure of an encoding data sequence output process. (A) is a figure which shows the format of an isochronous packet, (b) is a figure which shows the MPEG-TS packet in an isochronous packet. It is a flowchart which shows the procedure of an encoding data sequence input process. (A) is a diagram showing the timing of the original MPEG-TS packet, (b) is a diagram showing the timing of the MPEG-TS packet after conversion of the time stamp value, and (c) is an MPEG after changing the time stamp. -It is a figure which shows the timing of TS packet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,20 Recording device 11,21 Input / output digital interface (I / F) part 12,22 Encoded data sequence processing part 13,23 Recording / reproducing part 14,24 Control part 15 IEEE1394 serial bus

Claims (1)

In a dubbing system comprising a first recording device and a second recording device that performs dubbing of encoded data between the first recording device,
The first recording device includes:
First recording means for recording a packet sequence of encoded data;
First communication means for communicating with the second recording device;
By exchanging information with the second recording device via the first communication means, the range of the data transfer rate in communication with the second recording device is checked, and the data transfer is performed from the range of the data transfer rate. A transfer interval calculating means for determining a speed and calculating a transfer interval of each packet of the packet sequence of the encoded data recorded in the first recording means from the determined data transfer speed;
Based on the transfer interval calculated by the transfer interval calculating means, a time for transferring the packet sequence of the encoded data recorded in the first recording means at a speed different from the normal reproduction speed of the encoded data. A transmission packet generator for generating a transmission packet for transmitting information to each packet of the packet sequence and transmitting the packet sequence to the second recording device via the first communication unit; Prepared,
The second recording device includes:
A second communication means for communicating with the first recording device and receiving the transmission packet generated by the transmission packet generation means;
The time information described by the transmission packet generation means is included in each packet of the packet sequence of the encoded data included in the transmission packet received by the second communication means, and the normal reproduction speed time of the encoded data. Time information changing means for changing to information,
A dubbing system comprising: a second recording unit that records a packet sequence of the encoded data whose time information has been changed by the time information changing unit.

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