JP2005216346A - Digital recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To start recording immediately after power ON or disk insertion in a digital recording/reproducing device provided with a recording/reproducing means on two or more recording media, an encrypting means, a decrypting means, and a buffer memory disposed at the post stage of the encrypting means. <P>SOLUTION: While a DVD-RW drive 104 and a first encrypting means 102 for recording on a DVD-RW are not ready, digital video and voice signal data encrypted by a second encryption means 106 is stored in a second buffer memory 109. After the DVD-RW drive 104 and the first encryption means 102 are prepared, the encrypted digital video and voice signal data in the second buffer memory 109 is decrypted by a second decrypting means 107, and then further encrypted by the first encrypting means 102 to be recorded on the DVD-RW. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital recording / reproducing apparatus that converts a video / audio signal into a digital signal, further encrypts it, and records it on a hard disk (HD) or DVD (Digital Versatile Disc).

  As a device for recording and reproducing by converting a video / audio signal into a digital signal, a DVD recorder, an HD recorder, and a hybrid recorder in which a DVD recorder and an HD recorder are integrated are generally used. In addition, DVD recorders include DVD-RW recorders and DVD-RAM recorders, both of which employ copyright protection technology called CPRM (Content Protection for Recordable Media), and need to protect copyrights. When digitally recording video and audio signals, the DVD is authenticated based on information unique to each DVD (DVD-RW, DVD-RAM) inserted in the DVD drive, and the data to be recorded is encrypted. It is a standard that an encryption key (encryption key) to be generated is generated, and a video / audio signal digitized using the encryption key is encrypted and recorded on a disk.

  In addition, when recording is started while the medium is not ready for writing, such as immediately after the power is turned on, digital video and audio signals to be recorded are sequentially stored in the buffer memory, and when ready for writing, they are stored in the buffer memory. There is one that starts to write a digital video / audio signal to a medium (see Patent Document 1).

  Further, when recording, the unit of data output from the encryption unit and the unit of data actually recorded on the recording medium are slightly different, so a buffer is provided between the encryption unit and the drive (DVD drive, HDD). Many digital recording / reproducing apparatuses are configured to perform recording while arranging a memory and adjusting a recording timing and a recording unit to the drive.

JP 2000-285590 A

  However, in the digital recording / reproducing apparatus represented by the conventional DVD recorder described above, even if the recording is started immediately after the DVD is inserted into the DVD drive or immediately after the power is turned on, the data is read from and written to the DVD inserted in the disk drive. Until it is ready, information specific to the DVD cannot be obtained, and authentication and encryption key generation cannot be performed. Therefore, the digital video / audio signal cannot be encrypted, and as a result, recording on the DVD also begins. There was a problem that it was not possible.

  In the conventional digital recording / reproducing apparatus in which the buffer memory is arranged between the encryption means and the drive (DVD drive, HDD), when the encryption means such as CPRM is used, Even if recording is to be started immediately after insertion, the encryption means cannot be operated until information unique to the recording medium is obtained, and therefore data cannot be encrypted. That is, the data to be actually recorded cannot be generated, and the data cannot be stored in the buffer memory arranged at the subsequent stage of the encrypting means, so that the recording cannot be started.

  Although a configuration in which a buffer memory is arranged in front of the encryption means can be considered, there is a problem that an extra buffer memory is required, which complicates the configuration of the apparatus and increases the cost.

  The present invention has been made to solve such a problem, and the purpose thereof is to arrange the buffer memory at the subsequent stage of the encryption means but not at the preceding stage of the encryption means. Digital that can start recording immediately after power-on or immediately after insertion of a recording medium, even if the recording cannot be performed without using information specific to the recording medium even if recording is started immediately after power-on or immediately after insertion of the recording medium It is to provide a recording / reproducing apparatus.

The digital recording / reproducing apparatus of the present invention
First encryption means for encrypting input digital video / audio data and outputting first encrypted data;
First recording / reproducing means for recording the first encrypted data on a first recording medium and reproducing the first encrypted data;
First decryption means for decrypting the encryption of the first encrypted data;
Second encryption means for encrypting the input digital video / audio data and outputting second encrypted data;
Second recording / reproducing means for recording the second encrypted data on a second recording medium and reproducing the second encrypted data;
Second decryption means for decrypting the encryption of the second encrypted data;
A buffer memory capable of writing the output of the second encryption means, the second decryption means can read data, and the second recording / reproducing means can write and read data;
When recording digital video / audio data on the first recording medium, the digital video / audio data is stored in the second recording medium until the first recording / playback unit and the first encryption unit are ready. To the second encryption data, the second encrypted data is sequentially stored in the buffer memory, and the first recording / reproducing means and the first encryption means When ready, the second encrypted data stored in the buffer memory is sequentially decrypted into the original digital video / audio data by the second decryption means, and the decrypted digital video / audio data is converted into the first encryption data. Control means for inputting to the encryption means, encrypting the first encrypted data, and recording the first encrypted data on the first recording medium by the first recording / reproducing means. It is.

  According to the present invention, while the first recording / reproducing means and the first encryption means cannot be prepared, the digital video / audio signal data is encrypted to the second encrypted data by the second encryption means and the buffer is used. When the first recording / reproducing means and the first encryption means are ready, the second encrypted data in the buffer memory is decrypted by the second decryption means, Since the first encrypted data is encrypted into the first encrypted data and recorded on the first recording medium, recording can be started immediately after the power is turned on or immediately after the recording medium is inserted without changing the configuration of the apparatus. There is an effect that it can be realized.

Embodiment 1 FIG.
In the following first embodiment of the present invention, a hybrid recorder in which a DVD-RW recorder and an HD recorder in which the first recording medium is a DVD-RW and the second recording medium is an HD is integrated is taken as an example. explain. In such a digital recording / reproducing apparatus, when recording a video / audio signal requiring copyright protection immediately after insertion of the DVD-RW or immediately after turning on the power of the DVD-RW drive, information unique to the DVD-RW is obtained. Cannot be read yet, the encryption means for encrypting the digital video information signal with the encryption key (encryption key) generated based on the information unique to the disc cannot start the operation, and recording to the DVD-RW is not possible. We realized a digital recording and playback device that can start recording without any problem even when it cannot be started.

  FIG. 1 is a block diagram of a digital recording / reproducing apparatus according to Embodiment 1 of the present invention. The digital recording / reproducing apparatus shown in FIG. 1 generates an encryption key from MPEG encoder 101 that compresses an analog video information signal into a digital video / audio signal by MPEG compression, and information unique to the disc inserted in DVD-RW drive 104. Then, the first encryption means 102 that encrypts and outputs the input signal, the first decryption means 103 that decrypts the encrypted input signal with the encryption key, and the recording / reproduction on the DVD-RW The DVD-RW drive 104 for performing the data transfer, the first buffer memory 105 for adjusting the timing of data transmission / reception between the DVD-RW drive 104 and the first encryption means 102 and the first decryption means 103, and the input signal Second encryption means 106 for encryption, and second decryption means 10 for decrypting the data encrypted by the second encryption means 106 A hard disk (HD) recording / reproducing HDD 108, a second buffer memory 109 for adjusting the timing of data transmission / reception between the HDD 108, the second encryption means 106 and the second decryption means 107, and MPEG compression MPEG decoder 110 that demodulates the digital video / audio signal thus converted into an analog video / audio signal, MPEG encoder 101, first encryption means 102, first decryption means 103, second encryption means 106, and second A matrix switch 102 for arbitrarily connecting the input and output of the decoding means 107 and the MPEG decoder 110 is provided. In addition, when recording / reproducing to / from a DVD-RW that requires copyright protection, it is essential to perform encryption / decryption according to the CPRM standard, and the first encryption unit 102 and the first decryption are performed. The means 103 performs encryption and decryption according to the CPRM standard.

  The matrix switch 120 realizes recording and reproduction of the HDD 108 and the DVD-RW drive 104 independently, dubbing from the HDD 108 to the DVD-RW drive 104, and the like by arbitrarily switching between input and output. For example, when recording on the HDD 108 and playback from the DVD-RW drive 104 are performed simultaneously, the output of the MPEG encoder 101 and the input of the second encryption means 106 are connected, and the output of the first decryption means 103 and the MPEG The input of the decoder 110 is connected. Further, when the digital video information signal recorded on the HDD 108 is dubbed to the DVD-RW drive 104, the output of the second decryption means 107 and the input of the first encryption means 103 are connected to perform dubbing. Is realized.

  The matrix switch 120 controls the operations of the first encryption unit 102, the first decryption unit 103, the DVD-RW drive 104, the second encryption unit 106, and the second decryption unit 107, The recording operation (for example, the recording procedure shown in FIG. 4) and the reproducing operation of the digital recording / reproducing apparatus are controlled.

  During normal recording on a DVD-RW inserted in the DVD-RW drive 104, the matrix switch 120 connects the output of the MPEG encoder 101 and the output of the first encryption means 102. The MPEG encoder 101 generates digital video / audio signal data that is MPEG-compressed according to the DVD Video Recording format. At that time, the MPEG encoder 101 needs to protect the copyright of the input analog video / audio signal. For example, in the case of an NTSC system signal, a 2-bit CGMS-A (Copy Generation Management System-A) is transmitted on a VBI (Vertical Blanking Interval) line 20 of an input analog video / audio signal. Analog) information. FIG. 2 shows the definition of CGMS-A. If it is (1, 0), it is necessary to protect the copyright, so the DVD-RW must be encrypted and recorded. If it is (0, 0), copying is permitted. Therefore, it is not always necessary to encrypt and record. In the case of (1, 1), since recording on the DVD-RW itself is not permitted, recording is not performed. (0, 1) is undefined.

  Thus, when CGMS-A is (1, 0), the MPEG encoder 101 uses the Pes Scrambling Bit included in the Video Pack or Audio Pack defined by the DVD Video Recording format in the digital video / audio signal data to be encoded. Set. In the first encryption means 102, this Pes Scrambling Bit is discriminated and whether or not to encrypt is switched. In the following description, recording of digital video / audio signal data in which CGMS-A is (1, 0), that is, copyright protection is required.

  The first encryption means 102 performs authentication between the disc and the drive from information unique to the DVD-RW inserted in the DVD-RW drive 104, and also uses the Video Pack and Audio of the input digital video / audio signal data. If the Pes Scrambling Bit included in the Pack is set, an encryption key is generated based on information unique to the DVD-RW, and the input digital video / audio signal is encrypted using the encryption key ( Hereinafter, the digital video / audio signal encrypted by the first encryption means 102 is referred to as first encrypted data). The first encrypted data is sent to the first buffer memory 105, transferred while adjusting the transfer timing to the DVD-RW drive 104, and written to the DVD-RW in the DVD-RW drive 104. Note that the type of information unique to the DVD-RW necessary for the authentication method and encryption, the encryption key generation method, the encryption method, and the like are in accordance with the CPRM standard, and the description thereof is omitted here.

  The first buffer memory 105 normally adjusts data transmission / reception timing between the first encryption unit 102 and the DVD-RW drive 104 and between the first decryption unit 103 and the DVD-RW drive 104. Similarly, the second buffer memory 109 also has a normal function of adjusting the data transmission / reception timing between the second encryption means 106 and the second decryption means 107 and the HDD 108.

  In this way, the video / audio signal is digitally compressed, further encrypted, and written to the DVD-RW.

  However, immediately after the DVD-RW is inserted into the DVD-RW drive 104, the DVD-RW drive 104 is ready to read information on the inserted DVD-RW and write data to the DVD-RW. Generally, it takes 10 seconds or more. This is because it takes time to discriminate the type of the disk, stabilize the servo of the disk rotation, and the tracking servo of the optical head that reads / writes data from / to the disk. If a recording start button (not shown) of the apparatus is pressed during that time, the DVD-RW drive 104 cannot be prepared for the above reason, and information unique to the disc cannot be obtained. 102 cannot be operated, and recording cannot be started.

  FIG. 3 is a block diagram for explaining the operation of the digital recording / reproducing apparatus of the first embodiment. In order to record a digital video information signal on a DVD-RW by the DVD-RW drive 104, the connection in the matrix switch 120 is connected to the output of the normal MPEG encoder 101 and the input of the first encryption means 102. In the first embodiment, the output of the MPEG encoder 101 and the input of the second encryption means 106 are connected, and further, the output of the second decryption means 107 and the first encryption are connected. Connect the input of the means 102.

  Next, the operation will be described. FIG. 4 is a flowchart at the start of recording in Embodiment 1 of the present invention. Immediately after the DVD-RW is inserted into the DVD-RW drive 104, if a recording start button (not shown) of the apparatus is pressed in step 301, the process moves to step 302, and the MPEG video encoder 101 receives the input analog video / audio signal. Is started in accordance with the DVD Video Recording format, and is output to the second encryption means 106 as digital video / audio signal data. In step 303, the second encryption unit 106 starts operating, and the digital video / audio signal data sequentially input is encrypted by the encrypted digital video / audio signal (hereinafter, the second encryption unit 106 encrypts it). The digital video / audio signal is referred to as second encrypted data). Next, in step 304, the second encrypted data output from the second encryption unit 106 is accumulated in the second buffer memory 109.

  However, since the DVD-RW has just been inserted at this time, information on the DVD-RW cannot be read yet. Therefore, the first encryption unit 102 that operates based on information unique to each DVD-RW is also not operating. Therefore, in step 305, it is determined whether the DVD-RW drive 104 is ready and information unique to the inserted DVD-RW has been read. If the DVD-RW information cannot be read yet, the process proceeds to step 306. If the information is read, the process proceeds to step 307. In step 306, if the data cannot be read even after a predetermined time exceeds a preset time, an abnormal disk or the like may be inserted, and the recording operation is terminated. If not timed out, the process proceeds to step 305, and it is continued to determine whether or not the DVD-RW information has been read.

  In step 307, transfer of the second encrypted data sequentially stored in the second buffer memory 109 to the second decryption means 107 is started. Next, the process proceeds to step 308, where the operation of the second decryption means 107 is started, the encryption of the second encrypted data sequentially input is decrypted, the original digital video / audio signal data is sequentially decrypted, and the matrix switch The data is output to the first encryption unit 102 via 120.

  Next, in step 309, the encryption key generated based on the information unique to the disc obtained from the inserted DVD-RW is set in the first encryption means 102, and the digital video / audio signal sequentially input is set. The data is sequentially encrypted into the first encrypted data. Next, the process proceeds to step 310, and the first encrypted data is input to the DVD-RW drive 104 via the first buffer memory 105 by adjusting the write timing to the DVD-RW in the DVD-RW drive 104. And recorded on a DVD-RW.

Note that the size of the second buffer memory 109 is the second buffer memory until the first encrypted data is actually recorded on the DVD-RW after the series of steps after the recording button is pressed. The capacity should be large enough to continue storing the encrypted data. For example, it takes 20 seconds from when the MPEG encoder 101 generates digital video / audio signal data at a bit rate of 4 megabits per second (hereinafter referred to as 4 Mbps) and actually starts recording on the DVD-RW after the recording button is pressed. given that,
The second buffer memory 109 having a capacity of 4 Mbps × 20 seconds = 80 megabits may be arranged.

  The encryption key used for the second encryption unit 106 and the second decryption unit 107 may be generated based on information unique to the HDD 108 as in the DVD-RW side, or may be another method. Since there is no specific description, the specific description is omitted here.

  In this way, an apparatus capable of recording even when recording is started immediately after the DVD-RW is inserted into the DVD-RW drive 104 is realized.

  As described above, according to the first embodiment, two recording / reproducing means (DVD-RW drive 104, HDD 108) and two encryption means (first first) for two recording media (DVD-RW, HD). The encryption unit 102, the second encryption unit 106) and the two decryption units (the first decryption unit 103, the second decryption unit 107), respectively, and two buffer memories (first buffer memory) 105 and the second buffer memory 109) are respectively arranged in the subsequent stage of the encryption means (in the hybrid recorder in which the DVD recorder and the HDD are integrated), the DVD-RW drive 104 and the first buffer memory 109). While the encryption means 102 is not ready, the second encryption means 106 converts the digital video / audio signal data to the second encryption data. Is encrypted and stored in the second buffer memory 109, and when the DVD-RW drive 104 and the first encryption means 102 are ready, the second encrypted data in the second buffer memory 109 is stored. After the decryption by the second decryption means 107, the first encryption means 102 further encrypts the first encrypted data and records it on the DVD-RW. Therefore, without changing the configuration of the apparatus, Recording can be started immediately after the power is turned on or immediately after the recording medium is inserted.

Embodiment 2. FIG.
In the second embodiment of the present invention described below, the second encryption means 106 can output the input signal as it is without encrypting it in the first embodiment, and the second decryption can be performed. The means 107 is also used by operating in such a manner when it is possible to output the input signal without decryption. Since other operations are the same as those in the first embodiment, description thereof is omitted.

  Next, the operation will be described. FIG. 5 is a flowchart at the start of recording in Embodiment 2 of the present invention. Steps 401 and 402 are the same as those in the first embodiment. Immediately after the DVD-RW is inserted into the DVD-RW drive 104, if a recording start button (not shown) of the apparatus is pressed in step 301, the process moves to step 302, and the MPEG video encoder 101 receives the input analog video / audio signal. Is started in accordance with the DVD Video Recording format, and is output to the second encryption means 106 as digital video / audio signal data. In step 401, the second encryption means 106 passes through the input digital video / audio signal without encryption, and outputs it to the second buffer memory 109. Next, at step 304, the digital video / audio signal output from the second encryption unit 106 is sequentially stored in the second buffer memory 109.

  However, since the DVD-RW has just been inserted at this time, information on the DVD-RW cannot be read yet. Therefore, the first encryption unit 102 that operates based on information unique to each DVD-RW is also not operating. Therefore, in step 305, it is determined whether the DVD-RW drive 104 is ready and information unique to the inserted DVD-RW has been read. If the DVD-RW information cannot be read yet, the process proceeds to step 306. If the information is read, the process proceeds to step 307. In step 306, if the data cannot be read even after a predetermined time exceeds a preset time, an abnormal disk or the like may be inserted, and the recording operation is terminated. If not timed out, the process proceeds to step 305, and it is continued to determine whether or not the DVD-RW information has been read.

  In step 307, transfer of the second encrypted data sequentially stored in the second buffer memory 109 to the second decryption means 107 is started. Next, the process proceeds to step 402, where the second decryption means 107 does not process the digital video / audio signal data that is sequentially input, passes through the data as it is, and passes through the matrix switch 120 through the first encryption means 102. Output to.

  Next, in step 309, the encryption key generated based on the information unique to the disc obtained from the inserted DVD-RW is set in the first encryption means 102, and the digital video / audio signal sequentially input is set. The data is sequentially encrypted into the first encrypted data. Next, the process proceeds to step 310, and the first encrypted data is input to the DVD-RW drive 104 via the first buffer memory 105 by adjusting the write timing to the DVD-RW in the DVD-RW drive 104. And recorded on a DVD-RW.

  In this case as well, the size of the second buffer memory 109 is the same as when the first encrypted data is actually started to be recorded on the DVD-RW through the series of steps after the recording button is pressed. In the meantime, the capacity is set large enough to continue to store the second encrypted data.

  Also, the encryption key used for the second encryption unit 106 and the second decryption unit 107 may be generated based on information unique to the HD as with the DVD-RW side, or may be another method. Since there is no specific description, the specific description is omitted here.

  In this way, an apparatus capable of recording even when recording is started immediately after the DVD-RW is inserted into the DVD-RW drive 104 is realized.

  As described above, according to the second embodiment, two recording / reproducing means (DVD-RW drive 104, HDD 108) and two encrypting means (first recording medium) for two recording media (DVD-RW, HD). The encryption unit 102, the second encryption unit 106) and the two decryption units (the first decryption unit 103, the second decryption unit 107), respectively, and two buffer memories (first buffer memory) 105 and the second buffer memory 109) are respectively arranged in the subsequent stage of the encryption means (in the hybrid recorder in which the DVD recorder and the HDD are integrated), the DVD-RW drive 104 and the first buffer memory 109). While the encryption means 102 is not ready, the digital video / audio signal data is not encrypted by the second encryption means 106 but is encrypted. The second encryption means 106 is passed through and stored in the second buffer memory 109, and when the DVD-RW drive 104 and the first encryption means 102 are ready, the contents of the second buffer memory 109 are stored. The digital video / audio signal data is not decrypted by the second decryption means 107, passes through the second decryption means 107 as it is, and is input to the first encryption means 102. Furthermore, the first encryption means 102 Since the first encrypted data is encrypted and recorded on the DVD-RW, the recording can be started immediately after the power is turned on or the recording medium is inserted without changing the configuration of the apparatus.

Embodiment 3 FIG.
In the third embodiment of the present invention described below, writing can be started in the DVD-RW drive 104 after recording is started in order to reduce the capacity of the second buffer memory 109 in the first embodiment. Until the preparation is completed, the second encrypted data is recorded and stored in the HD in the HDD 108, and the apparatus can be realized at a lower cost.

  The configuration of the digital recording / reproducing apparatus according to the third embodiment is the same as that of the digital recording / reproducing apparatus according to the first embodiment shown in FIGS. 1 and 3, but the second buffer memory 109 is secondly encrypted. Are virtually divided into a first area for temporarily accumulating input data from and a second area for temporarily accumulating input data from the HDD.

  Next, the operation will be described. FIG. 6 is a flowchart at the start of recording in Embodiment 3 of the present invention. Steps 501 and 502 are the same as in the first embodiment. Immediately after the DVD-RW is inserted into the DVD-RW drive 104, if a recording start button (not shown) of the apparatus is pressed in step 301, the process moves to step 302, and the MPEG video encoder 101 receives the input analog video / audio signal. Is compressed in accordance with the DVD Video Recording format and output to the second encryption means 106 as digital video / audio signal data. In step 303, the second encryption means 106 starts its operation, and the sequentially input digital video / audio signal data is sequentially converted into an encrypted digital video / audio signal (hereinafter referred to as second encrypted data). Encrypt it. In step 501, the second encrypted data output from the second encryption unit 106 is input to the second buffer memory 109.

  At this time, the inside of the second buffer memory 109 is virtually divided into a first area in which input data from the second encryption means 106 is temporarily stored and a second area in which input data from the HDD 108 is temporarily stored. Therefore, the input data from the second encryption unit 106 and the input data from the HDD 108 are not mixed. In this way, the second encrypted data written to the first area of the second buffer memory 109 is transferred to the HDD 108 and stored while adjusting the data transfer timing to the HDD 108.

  However, since the DVD-RW has just been inserted at this time, information on the DVD-RW cannot be read yet. Therefore, the first encryption unit 102 that operates based on information unique to each DVD-RW is also not operating. Therefore, in step 305, it is determined whether the DVD-RW drive 104 is ready and information unique to the inserted DVD-RW has been read. If the DVD-RW information cannot be read yet, the process proceeds to step 306. If the information is read, the process proceeds to step 502. In step 306, if the data cannot be read even after a predetermined time exceeds a preset time, an abnormal disk or the like may be inserted, and the recording operation is terminated. If not timed out, the process proceeds to step 305, and it is continued to determine whether or not the DVD-RW information has been read.

  In step 502, the second encrypted data sequentially stored in the HDD 108 is transferred to the second decryption means 107 while adjusting the timing of data transfer via the second area of the second buffer memory 109. Start the transfer. Next, the process proceeds to step 308, where the operation of the second decryption means 107 is started, the encryption of the second encrypted data sequentially input is decrypted, the original digital video / audio signal data is sequentially decrypted, and the matrix switch The data is output to the first encryption unit 102 via 120.

  Next, in step 309, the encryption key generated based on the information unique to the disc obtained from the inserted DVD-RW is set in the first encryption means 102, and the digital video / audio signal sequentially input is set. The data is sequentially encrypted into the first encrypted data. Next, the process proceeds to step 310, and the first encrypted data is input to the DVD-RW drive 104 via the first buffer memory 105 by adjusting the write timing to the DVD-RW in the DVD-RW drive 104. And recorded on a DVD-RW.

  It should be noted that the size of the second buffer memory 109 may be large enough to adjust the timing of data transfer between the second encryption unit 106 and the HDD 108, and is very small as compared with the first embodiment. It doesn't matter if you have capacity.

  Also, the encryption key used for the second encryption unit 106 and the second decryption unit 107 may be generated based on information unique to the HD as with the DVD-RW side, or may be another method. Since there is no specific description, the specific description is omitted here. Further, the second encryption means 106 can output the input signal as it is without encryption, and the second decryption means 107 can output the input signal as it is without decryption. If possible, the second encryption means outputs the input digital video / audio data as it is without encryption, and the second decryption means outputs the input digital video / audio data as it is. It is good also as a structure.

  In this way, a device capable of recording can be realized even when recording is started immediately after the DVD-RW is inserted into the DVD-RW drive 104 without increasing the buffer memory capacity.

  As described above, according to the third embodiment, two recording / reproducing means (DVD-RW drive 104, HDD 108) and two encryption means (first encryption) for two recording media (DVD-RW, HD). Respectively, and two decryption means (first decryption means 103, second decryption means 107) and two buffer memories (first buffer memory 105). , The second buffer memory 109) is disposed in the subsequent stage of the encrypting means in a digital recording / reproducing apparatus (a hybrid recorder in which a DVD recorder and an HDD are integrated), and the DVD-RW drive 104 and the first buffer memory 109). While the encryption unit 102 is not ready, the digital video / audio signal data is converted into the second encrypted data by the second encryption unit 106. Once the data is encoded and recorded on the HD and the DVD-RW drive 104 and the first encryption means 102 are ready, the second encrypted data in the HD is encrypted by the second decryption means 107. After the decryption, the first encrypted data is further encrypted by the first encryption means 102 and recorded on the DVD-RW. Therefore, immediately after the power is turned on or the recording medium is inserted without changing the configuration of the apparatus. The start of recording can be realized. Further, since a large buffer memory is not required, it is not necessary to increase the buffer memory capacity, and the cost of the apparatus can be suppressed. The second encryption means 106 can output the input signal as it is without encryption, and the second decryption means 107 can output the input signal as it is without decryption. If possible, while the DVD-RW drive 104 and the first encryption unit 102 cannot be prepared, the digital video / audio signal data is input to the second encryption unit 106 and is not encrypted. The data is output and further recorded on the HD by the HDD 108 via the second buffer memory 109. When the DVD-RW drive 104 and the first encryption unit 102 are ready, the data is recorded on the HD by the HDD 108. The non-encrypted digital video / audio signal data is reproduced and input to the second decryption means 107 via the second buffer memory 109. And directly output, further encrypts the first encrypted data in the first encryption unit 102, can be recorded on a DVD-RW.

Embodiment 4 FIG.
In the fourth embodiment of the present invention described below, after the DVD-RW drive 104 is ready for recording on the DVD-RW in the third embodiment, the second encrypted data is transferred to the HD. The accumulation is stopped and accumulated in the buffer memory 109. The configuration of the digital recording / reproducing apparatus of the fourth embodiment is the same as that of the first embodiment shown in FIGS. The connection of the matrix switch 120 is the same. However, the second buffer memory 109 is virtually divided into a first area for temporarily storing input data from the second encryption means 106 and a second area for temporarily storing input data from the HDD 108. Keep it divided.

  Next, the operation will be described. FIG. 7 is a flowchart at the start of recording in Embodiment 4 of the present invention. Steps other than Step 601, Step 602, and Step 603 are the same as those in the third embodiment. Immediately after the DVD-RW is inserted into the DVD-RW drive 104, if a recording start button (not shown) of the apparatus is pressed in step 301, the process moves to step 302, and the MPEG video encoder 101 receives the input analog video / audio signal. Is compressed in accordance with the DVD Video Recording format and output to the second encryption means 106 as digital video / audio signal data. In step 303, the second encryption means 106 starts its operation, and the sequentially input digital video / audio signal data is sequentially converted into an encrypted digital video / audio signal (hereinafter referred to as second encrypted data). Encrypt it. Next, in step 501, the second encrypted data output from the second encryption unit 106 is input to the first area of the second buffer memory 109.

  At this time, the inside of the second buffer memory 109 is virtually divided into a first area for temporarily storing input data from the second encryption means 106 and a second area for temporarily storing input data from the HDD 108. Therefore, the input data from the second encryption unit 106 and the input data from the HDD 108 are not mixed. In this way, the second encrypted data written in the first area is transferred to and stored in the HDD 108 by adjusting the data transfer timing to the HDD 108.

  However, since the DVD-RW has just been inserted at this time, information on the DVD-RW cannot be read yet. Therefore, the first encryption unit 102 that operates based on information unique to each DVD-RW is also not operating. Therefore, in step 305, it is determined whether the DVD-RW drive 104 is ready and information unique to the inserted DVD-RW has been read. If the DVD-RW information cannot be read yet, the process proceeds to step 306. If the information is read, the process proceeds to step 502. In step 306, if the data cannot be read even after a predetermined time exceeds a preset time, an abnormal disk or the like may be inserted, and the recording operation is terminated. If not timed out, the process proceeds to step 305, and it is continued to determine whether or not the DVD-RW information has been read.

  In step 502, the second encrypted data sequentially stored in the HDD 108 is transferred to the second decryption means 107 while adjusting the timing of data transfer via the second area of the second buffer memory 109. Start the transfer. Next, the process proceeds to step 601, the transfer of the second encrypted data from the first area of the second buffer memory 109 to the HDD 108 is stopped, and the subsequent data is transferred to the first area of the second buffer memory 109. And change to accumulate.

  Next, the process proceeds to step 308, where the operation of the second decryption means 107 is started, the encryption of the second encrypted data sequentially input is decrypted, the original digital video / audio signal data is sequentially decrypted, and the matrix switch The data is output to the first encryption unit 102 via 120.

  Next, in step 309, the encryption key generated based on the information unique to the disc obtained from the inserted DVD-RW is set in the first encryption means 102, and the digital video / audio signal sequentially input is set. The data is sequentially encrypted into the first encrypted data. Next, the process proceeds to step 310, and the first encrypted data is input to the DVD-RW drive 104 via the first buffer memory 105 by adjusting the write timing to the DVD-RW in the DVD-RW drive 104. And recorded on a DVD-RW.

  Next, the process proceeds to step 602, where it is determined whether the remaining second encrypted data that has not yet been transferred to the second decryption means 107 remains in the second area of the HDD 108 and the second buffer memory 109. If it remains, the determination in step 602 is continued, and if it does not remain, the data to be output to the second decoding means 107 is changed to be output from the first area of the second buffer memory 109. In step 603, the operation of the HDD 108 is stopped.

Note that the size of the first area of the second buffer memory 109 is that the first encrypted data is actually started to be recorded on the DVD-RW through the series of steps after the recording button is pressed. Until the second encrypted data stored in the HD at the time is completely transferred to the second area of the second buffer memory 109, the subsequent second encrypted data is continuously stored. Capacity. For example, when the bit rate of the digital video / audio signal data generated by the MPEG encoder 101 is 4 Mbps and the series of processing speeds from reading in the HDD 108 to writing in the DVD-RW drive 104 is 16 Mbps, the recording button If it takes 20 seconds to start recording on a DVD-RW after is pressed,
Since the second encrypted data of 4 Mbps × 20 seconds = 80 megabits is accumulated and recording is started,
The data in the HD is transferred at 80 megabits / 16 Mbps = 5 seconds. Therefore, the size of the second area of the second buffer memory 109 is
4 Mbps × 5 seconds = 20 megabits.
In recent years, HDDs and DVD-RW drives capable of reading and writing at a speed higher than the maximum bit rate of recorded data are common, and thus can be realized without having to increase the capacity of the second buffer memory 109 so much.

  As described above, when the series of processing speeds from reading in the HDD 108 to writing in the DVD-RW drive 104 is twice the bit rate of the digital video / audio signal, the inside of the HDD 108 and the second buffer FIG. 8 shows a schematic explanatory diagram of the data accumulation process in the memory 109.

  First, as shown in FIG. 8A, until the first encryption unit 102 starts operation, the second encrypted data is sequentially recorded on the HD through the first area of the second buffer memory 109. It will be done. In FIG. 8 (a), Data1,..., Data100 indicate data as recording units for the HD, and the second encrypted data of the recording units from 1 to 100 are already recorded on the HD, and the 101st To the 110th recording unit of the second encrypted data is buffered in the first area of the second buffer memory 109.

  Next, when information is read from the DVD-RW, the transfer from the HDD 108 to the second area of the second buffer memory 109 is continued and the recording in the HDD 108 is stopped. As shown in (b), the data from Data 21 to Data 100 remains in the HD in the HDD 108, the data from Data 101 to Data 120 is stored in the first area of the second buffer memory 109, and the second buffer memory 109 In the second area, data from Data 1 to Data 20 is buffered.

  Furthermore, when the transfer from the second area of the second buffer memory 109 to the second decoding unit 107 is started for a while, there is no data in the HD in the HDD 108 as shown in FIG. Data 101 to Data 160 is stored in the first area of the second buffer memory 109, and data 81 to Data 100 is buffered in the second area of the second buffer memory 109.

  When time further passes, data exists only in the first area in the second buffer memory 109 as shown in FIG. 8 (d), and the second buffer memory is sent to the second decoding means 107. It changes so that it may output directly from 109 1st area | region.

  The encryption key used for the second encryption unit 106 and the second decryption unit 107 may be generated based on information unique to the HDD 108 as in the DVD-RW side, or may be another method. Since there is no specific description, the specific description is omitted here.

  In this way, a device capable of recording even when recording is started immediately after the DVD-RW is inserted into the DVD-RW drive 104 without requiring much buffer memory is realized.

  As described above, according to the fourth embodiment, after the DVD-RW drive 104 starts recording on the DVD-RW, the second encrypted data output from the second encryption unit 106 thereafter. Is stored in the second buffer memory 109, the transfer to the HDD 108 is stopped, and the second encrypted data once recorded on the HD is stored in the second buffer memory 109 via the second buffer memory 109. When there is no second encrypted data remaining in the HD sequentially transferred to the decryption means 107, data from the middle of the second encrypted data stored in the second buffer memory 109 is stored in the second buffer. Since the data is transferred directly from the memory 109 to the second decryption means 107, recording can be started immediately after the power is turned on or the recording medium is inserted without changing the configuration of the apparatus. In addition, since the recording / reproduction to / from the HD only needs to be operated for a minimum time, the power consumption of the apparatus hardly increases.

Embodiment 5 FIG.
In the above first to fourth embodiments, the digital recording / reproducing apparatus having two or more recording / reproducing means has been described. However, the fifth embodiment of the present invention described below is a recording means for recording on a recording medium and encryption. In a digital recording / reproducing apparatus having only one means and a decrypting means and having a buffer memory arranged after the encrypting means, information unique to the recording medium read from the recording medium at the time of the previous recording is stored. Then, the encryption means is operated based on the stored previous information, and the digital video / audio signal is encrypted and stored in the buffer memory. If the information is read, it is compared with the previous information. If it matches, recording on the recording medium starts. If not, the data stored in the buffer memory is discarded. Than it is.

  FIG. 9 is a block diagram of a digital recording / reproducing apparatus according to Embodiment 5 of the present invention. Components similar to those in FIG. The digital recording / reproducing apparatus shown in FIG. 9 includes an MPEG encoder 101 for MPEG-compressing an analog video information signal to convert it into a digital video / audio signal, and an encryption key (encryption key) from information unique to the disc inserted in the DVD-RW drive 104 Key) and encrypting the input signal and outputting it, decrypting means 133 for decrypting the encrypted input signal using the encryption key, and a characteristic of the inserted DVD-RW A DVD-RW drive 104 that reads information and then performs recording / reproduction on the DVD-RW, between the DVD-RW drive 104 and the encryption unit 132, between the DVD-RW drive 104 and the decryption unit 133, and DVD- Buffer memory 13 for adjusting the timing of data transmission / reception between the RW drive 104 and the information storage means 130 An MPEG decoder 110 that demodulates the MPEG-compressed digital video / audio signal into an analog video / audio signal, and the second buffer memory 109 that is read from the DVD-RW inserted at the previous recording by the DVD-RW drive 104. Information storage means 130 for storing information unique to the DVD-RW transferred via the information storage device 130. In addition, when recording / reproducing to / from a DVD-RW that requires copyright protection, it is essential to perform encryption / decryption according to the CPRM standard, and the encryption unit 132 and the decryption unit 133 conform to the CPRM standard. Therefore, encryption and decryption are performed.

  Next, the operation will be described. FIG. 10 is a flowchart at the start of recording in Embodiment 5 of the present invention. Immediately after inserting the DVD-RW into the DVD-RW drive 104, if a recording start button (not shown) of the apparatus is pressed in step 701, the process proceeds to step 702, where the MPEG encoder 101 receives the input analog video / audio signal. Is compressed in accordance with the DVD Video Recording format and output to the encryption means 132 as digital video / audio signal data. In step 703, the encryption means 132 encrypts the digital video / audio signal data using the encryption key generated based on the unique information of the previous DVD-RW stored in the information storage means 130 at the time of the previous recording. Encrypt into encrypted data. In step 704, the encrypted data output from the encryption unit 132 is sequentially stored in the buffer memory 135.

  However, since the DVD-RW is inserted immediately at this time, information on the DVD-RW cannot be read yet, and data cannot be written. In step 705, it is determined whether the DVD-RW drive 104 is ready and information unique to the inserted DVD-RW has been read. If the DVD-RW information cannot be read yet, the process proceeds to step 706, and if it is read, the process proceeds to step 707. In step 706, if reading is not possible even after a predetermined time exceeds a preset time, an abnormal disk or the like may be inserted, and the recording operation is terminated. If not timed out, the process proceeds to step 705, and it is continued to determine whether or not the DVD-RW information has been read.

  In step 707, the information unique to the DVD-RW newly read this time from the DVD-RW is compared with the previous information stored in the information storage means 130. If not, go to Step 709. Note that the information storage means 130 is preferably a non-volatile storage device so that it can cope with a power failure.

  In step 709, it can be determined that a DVD-RW different from the previous one has been inserted, and even if data encrypted based on the previous information is recorded on the current DVD-RW, it is generated from information unique to the DVD-RW. Since the encryption key at the time of playback does not match the encryption key at the time of encryption, the encryption cannot be decrypted and cannot be played back, so the encrypted data stored in the buffer memory 135 becomes invalid and discarded. End up. Next, the process proceeds to step 711, where information specific to the DVD-RW read by the DVD-RW drive 104 from the DVD-RW inserted this time is stored in the information storage means 130. The recording process is resumed and recording is performed on the current DVD-RW which is different from the previous one.

  In step 708, since it can be determined that the previous DVD-RW is the same as the previous recording, the encrypted data sequentially stored in the buffer memory 135 is adjusted while the write timing to the DVD-RW is adjusted. Output to the DVD-RW drive 104 is started, and recording on the DVD-RW is started. Next, the process proceeds to step 710, where information unique to the DVD-RW inserted this time is stored in the information storage means 130, and the steady recording state is entered in preparation for the start of the next recording.

  As described above, according to the fifth embodiment, one recording / reproducing means (DVD-RW drive 104), one encryption means 132, and one decryption means 133 for one recording medium (DVD-RW). In the digital recording / reproducing apparatus in which one buffer memory 135 is disposed after the encryption unit 132, the unique information cannot be read from the DVD-RW immediately after the power is turned on or the recording medium is inserted. While the encryption means 132 for performing encryption based on the information cannot be prepared, the specific information of the previous DVD-RW acquired and stored from the previous DVD-RW at the time of the previous recording is used. The encryption unit 132 is operated, the digital video / audio signal is encrypted and stored in the buffer memory 135, and the unique information is read from the DVD-RW this time. Is read, the unique information and the previous unique information are compared, and if they match, the recording of the encrypted data stored in the buffer memory 135 to the current DVD-RW is started and matches. Otherwise, since the data stored in the buffer memory 103 is discarded, the recording can be started immediately after the power is turned on or the recording medium is inserted without changing the configuration of the apparatus. In addition, if the DVD-RW is exchanged and the previous unique information is different from the unique information read this time, the data stored in the buffer memory 135 is discarded, so that erroneous data is stored in the DVD-RW. There is no writing.

  It should be noted that the present invention is also applicable to a device that has two or more recording means and takes one time to prepare for recording in one of the recording means, such as a DVD-RW recorder having a memory card slot. Can be applied.

  Further, the present invention is an apparatus for recording on a recording medium by a copyright protection technique using only one recording means and using information unique to the recording medium, such as immediately after the recording medium is inserted into the recording means. It can also be applied to devices that cannot obtain information specific to the device immediately.

1 is a block configuration diagram of a digital recording / reproducing apparatus according to Embodiments 1, 2, 3, and 4 of the present invention. It is explanatory drawing of CGMS-A which concerns on Embodiment 1, 2, 3, 4, 5 of this invention. It is a block diagram explaining operation | movement of the digital recording / reproducing apparatus based on Embodiment 1, 2, 3, 4 of this invention. It is a flowchart at the time of the start of recording which concerns on Embodiment 1 of this invention. It is a flowchart at the time of the start of recording which concerns on Embodiment 2 of this invention. It is a flowchart at the time of the recording start which concerns on Embodiment 3 of this invention. It is a flowchart at the time of the recording start which concerns on Embodiment 4 of this invention. It is a schematic explanatory drawing of the example of data in the buffer memory and HDD concerning Embodiment 4 of this invention. It is a block block diagram of the recording / reproducing apparatus which concerns on Embodiment 5 of this invention. It is a flowchart at the time of the recording start which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 MPEG encoder, 102 1st encryption means, 103 1st decoding means, 104 DVD-RW drive, 105 1st buffer memory, 106 2nd encryption means, 107 2nd decoding means, 108 HDD, 109 second buffer memory, 110 MPEG decoder, 120 matrix switch, 130 information storage means, 132 encryption means, 133 decryption means, 135 buffer memory

Claims (6)

First encryption means for encrypting input digital video / audio data and outputting first encrypted data;
First recording / reproducing means for recording the first encrypted data on a first recording medium and reproducing the first encrypted data;
First decryption means for decrypting the encryption of the first encrypted data;
Second encryption means for encrypting the input digital video / audio data and outputting second encrypted data;
Second recording / reproducing means for recording the second encrypted data on a second recording medium and reproducing the second encrypted data;
Second decryption means for decrypting the encryption of the second encrypted data;
A buffer memory capable of writing the output of the second encryption means, the second decryption means can read data, and the second recording / reproducing means can write and read data;
When recording digital video / audio data on the first recording medium, the digital video / audio data is stored in the second recording medium until the first recording / playback unit and the first encryption unit are ready. To the second encryption data, the second encrypted data is sequentially stored in the buffer memory, and the first recording / reproducing means and the first encryption means When ready, the second encrypted data stored in the buffer memory is sequentially decrypted into the original digital video / audio data by the second decryption means, and the decrypted digital video / audio data is converted into the first encryption data. Control means for inputting to the encryption means and encrypting the first encrypted data, and recording the first encrypted data on the first recording medium by the first recording / reproducing means. Digital recording and reproducing apparatus according to claim. First encryption means for encrypting input digital video / audio data and outputting first encrypted data;
First recording / reproducing means for recording the first encrypted data on a first recording medium and reproducing the first encrypted data;
First decryption means for decrypting the encryption of the first encrypted data;
A second encryption means for switching whether the input digital video / audio data is encrypted and the second encrypted data is output or the input digital video / audio data is output as it is;
Second recording / reproducing means for recording the second encrypted data on a second recording medium and reproducing the second encrypted data;
A second decryption means capable of switching whether to decrypt and output the input second encrypted data or to output the input data as it is;
A buffer memory capable of writing the output of the second encryption means, the second decryption means can read data, and the second recording / reproducing means can write and read data;
When recording digital video / audio data on the first recording medium, the digital video / audio data is stored in the second recording medium until the first recording / playback unit and the first encryption unit are ready. Are input to the encryption means, output without being encrypted, and sequentially stored in the buffer memory. When the first recording / reproducing means and the first encryption means are ready, The stored digital video / audio data is sequentially input to the second decryption means and output as it is, and the digital video / audio data is input to the first encryption means to be encrypted into the first encrypted data, A digital recording / reproducing apparatus comprising: control means for recording the first encrypted data on the first recording medium by the first recording / reproducing means. First encryption means for encrypting input digital video / audio data and outputting first encrypted data;
First recording / reproducing means for recording the first encrypted data on a first recording medium and reproducing the first encrypted data;
First decryption means for decrypting the encryption of the first encrypted data;
Second encryption means for encrypting the input digital video / audio data and outputting second encrypted data;
Second recording / reproducing means for recording the second encrypted data on a second recording medium and reproducing the second encrypted data;
Second decryption means for decrypting the encryption of the second encrypted data;
A buffer memory capable of writing the output of the second encryption means, the second decryption means can read data, and the second recording / reproducing means can write and read data;
When recording digital video / audio data on the first recording medium, the digital video / audio data is stored in the second recording medium until the first recording / playback unit and the first encryption unit are ready. To the second encrypted data, and the second encrypted data is once recorded on the second recording medium by the second recording / reproducing means via the buffer memory. When the first recording / reproducing means and the first encryption means are ready, the second recording / reproducing means reproduces the second encrypted data from the second recording medium, The second encrypted data is sequentially input to the second decryption means via the buffer memory and decrypted into the original digital video / audio data, and the decrypted digital video / audio data is converted into the first encrypted data. And a control means for encrypting the first encrypted data into the first recording data, and recording the first encrypted data on the first recording medium by the first recording / reproducing means. Recording / playback device.   After the first recording / reproducing means starts recording on the first recording medium, the control means starts from the middle of the second encrypted data output from the second encryption means thereafter. Are sequentially stored in the buffer memory without being recorded on the second recording medium, and the last data of the second encrypted data reproduced from the second recording medium is transferred to the buffer memory via the buffer memory. Continuously input to the second decryption means, data from the middle of the second encrypted data stored in the buffer memory is input to the second decryption means. The digital recording / reproducing apparatus according to claim 3. An encryption means for encrypting the digital video / audio data with an encryption key created based on information unique to the recording medium and outputting the encrypted data;
A recording / reproducing means for reading information unique to the recording medium from the inserted recording medium, recording the encrypted data on the recording medium, and reproducing the encrypted data;
Decryption means for decrypting the encrypted encrypted data using the encryption key;
A buffer memory capable of writing the output of the encryption means, the decryption means can read data, and the recording / playback means can write and read data;
An information storage means for storing the unique information read by the recording / reproducing means,
When recording digital video / audio data on the recording medium inserted into the recording / reproducing means, while the recording / reproducing means cannot be prepared and the unique information of the inserted recording medium cannot be read, In the encryption means, an encryption key is generated based on the unique information of the previous recording medium read from the previous recording medium and stored in the information storage means at the time of the previous recording, and the digital key is generated by the encryption key. When the audio / video data is encrypted, the encrypted data is sequentially stored in the buffer memory, and the unique information of the inserted recording medium can be read, the unique information is compared with the unique information of the previous recording medium. If the two pieces of unique information match, the encrypted data stored in the buffer memory is recorded on the inserted recording medium by the recording / reproducing means, If no match is broadcast, the digital recording and reproducing apparatus characterized by discarding the encrypted data stored in the buffer memory. First encryption means for encrypting input digital video / audio data and outputting first encrypted data;
First recording / reproducing means for recording the first encrypted data on a first recording medium and reproducing the first encrypted data;
First decryption means for decrypting the encryption of the first encrypted data;
A second encryption means for switching whether the input digital video / audio data is encrypted and the second encrypted data is output or the input digital video / audio data is output as it is;
Second recording / reproducing means for recording and reproducing the input data on the second recording medium;
Second decryption means capable of switching whether to decrypt and output the data input from the second recording / reproducing means or to output the input data as it is;
A buffer memory capable of writing the output of the second encryption means and allowing the second decryption means to read data;
When recording digital video / audio data on the first recording medium, the digital video / audio data is stored in the second recording medium until the first recording / playback unit and the first encryption unit are ready. To the encryption means and output as it is without encryption, and further, the second recording / playback means once through the buffer memory, and once recorded on the second recording medium in order, the first recording / playback When the means and the first encryption means are ready, the digital video / audio data recorded on the second recording medium is reproduced by the second recording / reproducing means, and the first and second encryption means are sequentially accessed via the buffer memory. 2 is inputted to the decryption means 2 and outputted as it is, and the digital video / audio data is inputted to the first encryption means to be encrypted into the first encrypted data, and the first encrypted data is obtained. The digital recording and reproducing apparatus characterized by comprising a control means for recording on the first recording medium by said first recording and reproducing means.

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