JP2011175730A - Digital signal receiver and digital signal recording/reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To permit a receiver to perform temporary recording/reproduction while limiting to time shift recording even for a program which it is forbidden to record in digital broadcasting, whereby the user's convenience is improved and the broadcaster's copyright is protected. <P>SOLUTION: A digital signal having a control flag relating to temporary copy permission is input, and the digital signal is temporarily recorded in a recording medium based on the condition of the control flag, and is temporarily reproduced from the recording medium based on the condition of the control flag. Temporary copy permits recording/reproduction, depending on conditions, i.e., the type of the recording medium, reproduction time, a reproduction period, and the number of times of reproduction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a digital signal recording / reproducing apparatus, a receiving apparatus, and a transmission method for receiving digital signals such as digital broadcasting and cable television, and performing recording control by performing copy control.

  There are generally four types of conventional copy control information. They are Never Copy, which never allows copying, Copy Once, which allows copying once, Copy Free, which allows copying any number of times, and No More Copy which is a child copy of Copy Once. For example, information such as Never Copy, Copy Once, Copy Free is written in the digital signal from the broadcasting station, and when the user makes a backup on his / her recording medium, It is. Never Copy cannot be recorded because copying is not allowed. Copy Once can be recorded as a time shift that shifts the viewing time, and the user can make a child copy only once on the recording medium. At that time, the digital signal written on the recording medium becomes No More Copy, and no further child copy can be created. Copy Free allows users to copy as many times as they like.

  When a user wants to watch a program being broadcast at a desired time, or wants to watch it many times instead of once, there is a demand for recording the program once on the user's recording device for the purpose of time shifting. However, if broadcast with copy control is performed, such as broadcast or cable broadcast, recording for the purpose of time shift cannot be performed at all. Furthermore, digital recording by digital broadcasting or cable broadcasting that will become the mainstream in the future can be recorded while maintaining high image quality, so the ratio of methods that do not allow recording such as Never Copy is further increased. The regulations on recording are expected to be stricter than analog.

  In this way, Never Copy, which is expected to be used frequently in digital broadcasting, is contrary to the user's request to record time-shifted, and the user can freely change the time to watch and listen to the program. Because it is not possible, the user has to give up restricting the action or viewing. This means that only some users can get the benefits of digital broadcasting.

  An object of the present invention is a digital signal receiving apparatus that eliminates the disadvantages of the prior art and performs recording and reproduction control limited to time shift recording on the digital signal receiving side even for a program that does not allow recording such as Never Copy It is to provide a recording / reproducing apparatus and a transmission method.

  The above object is to input a digital signal having a control flag relating to temporary copy permission, temporarily record the digital signal on the first recording medium based on the condition of the control flag, and temporarily store the digital signal based on the condition of the control flag. It is achieved by reproducing from one recording medium, and further by recording a signal reproduced from the first recording medium on the second recording medium based on the condition of the control flag.

  According to the digital signal recording / reproducing apparatus, receiving apparatus, and transmission method of the present invention, even when the digital signal is not allowed to be recorded, such as when the copy control flag is Never Copy, copying is temporarily permitted. By adding the control flag, the user can perform time shift recording and reproduction, and can prevent recording and reproduction other than time shift. Therefore, both the copy restriction on the broadcasting station side and the time shift request on the user side can be satisfied.

The figure which shows 1st Embodiment of the reception recording / reproducing system of this invention. The flowchart regarding the control flag of this invention. The detailed block diagram of FIG. The figure which shows the 2nd Embodiment of this invention. The detailed block diagram of FIG. The figure which shows the 3rd Embodiment of this invention. The figure which shows the 4th Embodiment of this invention. The figure which shows the 5th Embodiment of this invention. The figure which shows the bit structural example of the control flag of this invention.

  FIG. 1 shows a first embodiment of a reception recording / reproducing system employing the present invention. The broadcast signal transmitted from the broadcast station 1 is received by the receiver 22, output by the monitor / speaker 24, and recorded / reproduced by the recording / reproduction device 23. The receiver 22 temporarily records a signal on the first recording medium 32. The first recording medium 32 may be installed outside and connected to the receiver.

  The receiver 22 may receive a signal other than a broadcast signal, for example, a signal transmitted by a cable or a network.

  The broadcast station 1 superimposes a control flag for recording / reproduction control on the digital signal, modulates it, and sends it to the receiver 22. The broadcasting station 1 and the receiver 22 are connected by a radio signal or an electric or optical signal using a cable or an optical fiber as a medium. The control flag is a copy control flag of Copy Once, Never Copy, or Copy Free, and a temporary copy control flag (hereinafter referred to as Temp. Copy flag). This Temp. Copy can be further classified into playback time, playback period, playback count, and recording medium type. Whether the playback time is before the specified time, whether it is within the specified period from the recording time, playback This is for checking whether the number of times is within the prescribed number of times and whether the recording medium is a prescribed recording medium. Table 1 shows the relationship between the recording state on the first recording medium and the recording state from the first recording medium to the second recording medium with respect to the copy control flag of the input signal. Table 1 shows whether or not recording on the first recording medium 32 is possible, and whether or not the recorded signal can be reproduced and recorded again on the second recording medium 18 after recording the digital signal on the second recording medium 18. Is shown. When the user records directly on the second recording medium 18 without recording on the first recording medium 32, the digital signal is recorded on the second recording medium 18 in accordance with the copy control flag.

Recording to the first recording medium is performed when the Temp. Copy flag of the input digital signal is temporarily recordable, regardless of whether the copy control flag is Never Copy, Copy Free, or Copy Once. The digital signal can be recorded in the memory 32 as it is. If the Temp. Copy flag of the input digital signal cannot be temporarily recorded, it can be recorded only when the copy control flag is Copy Free and Copy Once. At that time, the Copy Once flag is converted to No More Copy and recorded. Alternatively, Copy Once may not be recorded. Furthermore, it may not be possible to record everything including Copy Free.
When the copy control flag is No More Copy, it can be handled in the same way as Never Copy.
When recording to the first recording medium 32 when the Temp. Copy flag is temporarily recordable, recording may be performed by converting to No More Copy when the copy control flag is Copy Once, but without conversion, If recording is performed with Copy Once, the temporarily recorded one can be recorded on the second recording medium 18 or the like.

  When recording from the first recording medium 32 to the second recording medium 18, the Temp. Copy flag of the input digital signal can be temporarily recorded, and in the case of a digital signal temporarily recorded on the first recording medium 32, When the copy control flag of the input digital signal is Never Copy, recording cannot be performed, but Copy Free can be recorded, and Copy Once can be recorded after being converted to No More Copy. When the Temp. Copy flag of the input digital signal cannot be temporarily recorded, it can be recorded only when the copy control flag of the input digital signal is Copy Free. In this way, temporary copying can be permitted by newly assigning a Temp. Copy flag to Never Copy in which conventional copying is completely prohibited.

  Further, at the time of reproduction from the second recording medium 18, reproduction from the medium on which illegal copying has been performed can be prohibited by checking the copy control flag. For example, if the medium to be played is a recordable medium, that is, an input digital signal is recorded, the copy control flag should be No More Copy or Copy Free. Ban. When the medium to be reproduced is a non-recordable medium, the copy control flag should be Never Copy, Copy Once, or Copy Free, and therefore reproduction is prohibited when No More Copy.

  The temporary copy when the Temp. Copy flag is temporarily recordable is a temporary copy limited to this purpose for the purpose of time shifting. Therefore, by providing the following constraint conditions during recording and reproduction, it is possible to more reliably limit the functions.

  Table 2 shows each control flag of the Temp. Copy flag related to recording / reproduction on the first recording medium 32.

Each control flag in Table 2 will be described with reference to FIG. FIG. 2 is a flowchart of the operation at the time of recording / reproducing on the first recording medium 32.
At the time of recording (S200), the Temp. Copy control flag is detected. If the Temp. Copy control flag exists and temporary recording is possible (S201), a check is made (S202) as to whether the medium specified by the recording medium flag corresponds to the first recording medium 32 When the recording medium is compatible, digital signal recording (S205) is performed. For example, recording is permitted for a recording medium that cannot be taken out, such as a hard disk drive or a fixed flash memory, and recording is not allowed for a recording medium that can be taken out such as a VTR. In addition, recording is permitted for a recording medium built in the receiver 22, and recording is not permitted for a recording medium connected to the outside. At the time of recording, the recording end time or the recording start time is recorded in the first recording medium 32 or a register in the receiver 22 or the like. If temporary recording is not possible (S201), recording is performed according to the copy control flag. That is, if the copy control flag is Copy Once or Copy Free, recording is performed (S203, S204).

  At the time of reproduction (S200), first, it is checked whether or not the digital signal to be reproduced is temporarily recorded (S206). Whether it is temporary recording may be checked by the presence or absence of the Temp. Copy control flag, or information indicating whether it is temporary recording may be recorded and checked. . If it is temporarily recorded, the recording medium flag (S207), reproduction time flag (S208), reproduction period flag (S209), and reproduction number flag (S210) are checked as shown in Table 2 and FIG. . When the recording medium flag is detected, the type of the first recording medium 32 is detected, and it is checked whether the detected first recording medium 32 is a medium designated by the flag (S207). If it is not, the playback is stopped or the playback output is cut (S211). When the playback time flag is detected, the current time is compared with the specified time (S208), and if it is before the specified time, the playback is continued, and if it has passed, the playback is stopped, or , Cut the playback output. When the playback period flag is detected, the recording time is compared with the specified time obtained from the specified period and the current time (S209), and if it is before the specified time, the playback is continued as it is, and the time passes. If so, stop playback or cut playback output. The reproducible time is set, for example, to 12:00 am on the next day, which is a time just 24 hours after the recording time. The reproducible period is set to be within 6 hours, within a day, or within a week from the recording time. When the reproduction number flag is detected, the number of reproductions so far and the number of reproducible times are compared (S210). If the number of reproductions is within the reproducible number, the reproduction is continued as it is, and if it is more than that, the reproduction is stopped or the reproduction output is cut. The reproducible number of times is set to once or twice. If the recording is not temporary, playback is not restricted.

  The digital signal recorded on the first recording medium 32 may be automatically deleted depending on the time limit or the number of reproductions. As a result, it is possible to more reliably limit reproduction. For example, the digital signal recorded on the first recording medium 32 is erased when the time limit by the reproduction time flag or the reproduction period flag has passed. Similarly, the digital signal recorded on the first recording medium 32 is erased when the number of reproductions specified by the reproduction number flag is exceeded. The erasure may be performed at the time of reproduction. However, regardless of whether or not reproduction is performed, it is possible to confirm the expiration date of the signal recorded periodically and automatically delete the signal when the expiration date has passed. Further, regardless of the presence or absence of a flag, it may be deleted unconditionally when a certain time limit or the number of reproductions has passed. Further, the erasure may be performed not by the number of reproductions but by the number of times of recording on the second recording medium 18. For example, if the recording is performed once on the second recording medium 18, it is possible to prevent a plurality of copies from being created. The user can determine the remaining recordable amount of the first recording medium 32 from the data displayed on the monitor or the display device such as the speaker 24 and erase the recorded digital signal.

The digital signal can be erased by erasing the digital signal itself, or by erasing or changing a part of the digital signal or information indicating the digital signal, or adding information indicating that the digital signal cannot be reproduced. You may make it impossible to reproduce. By erasing the whole, erasing can be performed completely. In addition, the erasure process can be performed in a short time by making the reproduction impossible by partially erasing, changing, or adding information.
Furthermore, one program may be erased at a time, or it may be partially erased according to the reproduced part or the recorded time.

  Table 3 shows an example of combinations of recording states in the first recording medium and the second recording medium for input copy control. If temporary recording is possible with Copy Once, the first recording medium 32 can be temporarily recorded, and the second recording medium 18 converts the Copy Once signal from the first recording medium 32 into No More Copy. It is possible to record later. If recording is possible with Never Copy, the first recording medium 32 can perform temporary recording, but the second recording medium 18 cannot perform recording. If temporary recording is impossible with Never Copy, neither the first recording medium 32 nor the second recording medium 18 can be recorded.

  FIG. 3 is a detailed drawing of the first embodiment. The receiver 22 includes a demodulation circuit 2, a digital signal decoding device 4, a copy guard insertion device 5, a buffer 6, a digital / analog converter 7, a second control device 8, a first control flag detection device 27, a first control flag detection device 27, and a first control flag detection device 27. The controller 29 includes a recording system encoder 30, a first amplifier 31, a first recording medium 32, a second amplifier 33, and a first reproduction system encoder 34. The recording / reproducing device 23 includes a second control flag detection device 13, a third control device 14, a copy information insertion device 15, a second recording system encoder 16, a third amplifier 17, a second recording medium 18, It comprises a fourth amplifier 19 and a second reproduction system encoder 20.

  Next, the operation will be described separately for the receiver 22 and the recording / reproducing apparatus 23. In the receiver 22, it is as follows. The demodulation circuit 2 receives and demodulates a broadcast signal from the broadcast station 1 via a radio wave or a cable, and outputs a digital signal. The demodulation circuit 2 performs demodulation, synchronization, data rearrangement, error correction, etc., and outputs a digital signal. Although not shown, the second control device 8 controls the operation of the receiver 22 by an input from a key or a remote controller. The first control device 29 controls recording / reproduction on the recording medium under the control of the second control device 8. At the time of reception, the first control device 29 causes the fifth switch 26 to select the demodulation circuit 2 and outputs the received signal to the first switch 3 and the recording / reproducing device 23. In addition, the temporary recording of the received signal to the recording medium 32 is instructed, and the first control flag detection device 27 detects a temporary copy flag as a control flag, the Temp. Copy flag. If it is determined that recording is possible, the first control device 29 turns on the sixth switch 28. Alternatively, the sixth switch 28 may be normally on. In this case, the sixth switch 28 is shut off when temporary recording is impossible. For example, if it takes time to detect the Temp. Copy flag, the sixth switch 28 is turned off if it is not possible to detect that temporary recording is possible for a certain period.

  When the sixth switch 28 is turned on, the received signal modulates the digital signal so that it can be recorded on the first recording medium 32 by the first recording system encoder 30, and the first signal is transmitted through the first amplifier 31. It is recorded on the recording medium 32. At this time, the recording time when recording on the first recording medium 32 is recorded on the first recording medium 32 or stored in a non-volatile memory built in the first control device 29. Recording on the first recording medium 32 is executed, for example, when a digital signal is temporarily recorded according to a user instruction. Further, the first recording medium 32 may always be recorded endlessly. A signal for a fixed time such as 10 hours may be always recorded endlessly. When the recording medium flag is detected after the detection of the Temp. Copy flag, the first recording medium 32 can be recorded only by the medium designated by the recording medium flag. For example, the control is such that the code is “1” for a magneto-optical disk, “0” for the others, “0” for temporary recording, and “1” for temporary recording.

  On the other hand, at the time of reproduction, the user instructs the second control device 8 to start reproduction, and the second control device 8 connects the fifth switch 26 to the seventh switch 35 and digitally transmits it from the first recording medium 32. Play the signal. When the digital signal is reproduced, the modulated signal is output from the first recording medium 32, amplified by the second amplifier 33, and converted into a digital signal by the first reproduction system encoder 34. The digital signal output from the first reproduction system encoder 34 is checked for a control flag by the first control flag detector 27. For example, when it is detected that the reproduction time is limited by the reproduction time flag, the first control device 29 checks the reproduction time based on the detection signal from the first control flag detection device 27. If the current time is within the range of the permitted time for reproduction and the first controller 29 determines that reproduction is possible, the seventh switch 35 is turned on. The fifth switch 26 selects the output of the seventh switch 35, and the reproduced digital signal is output to the digital signal decoding device 4 via the fifth switch 26. If the control flag detection time in the first control flag detection device 27 is long, the seventh switch 35 may be normally turned on. In this case, if the control flag cannot be found within the specified time, it is shut off. For example, when it is detected that the reproduction time is limited by the reproduction period flag, the first control device 29 detects the reproduction time and the recorded digital signal based on the detection signal from the first control flag detection device 27. The recording time is compared to check whether it is within the reproducible period range. If it is the permitted period, the first control device 29 permits the reproduction and turns on the seventh switch 35. If it takes time to detect the control flag, it may be normally on. At this time, if the control flag is not detected within the specified time, the control is interrupted. In this way, by setting the playback period, an operation similar to rental video can be performed. For example, if the playback period is a simple date such as 1 day or 2 days, the amount of control information is reduced and control becomes easy.

  When the first control flag detection device 27 detects the regeneration count flag as the control flag, the first control flag detection device 27 transmits a detection signal to the first control device 29. The first control device 29 stores the number of times of reproduction this time in the memory or records it in the first recording medium 32. At the same time, if the number of times of reproduction this time is within the range of the number of reproducible times, the first control device 29 turns on the seventh switch 35. If it takes time to detect the control flag, it may be normally on. In this case, if the control flag cannot be detected within the specified time, the seventh switch is shut off. The number of times of reproduction is set to a simple number such as once, twice, etc. so that the user does not count when searching for a portion to be viewed for about 2 seconds or when performing a high-speed search. In this way, when the control flag specifies the number of times of reproduction, the same effect as when a theater movie is seen can be expected by limiting the number of times. The recording medium 32 can be used as a buffer even when the number of times of reproduction is one and the program is to be interrupted only slightly or for the purpose of time shift.

As described above, by using these control flags, the receiver 22 can temporarily record a digital signal according to a user's instruction and reproduce it, thereby enabling a time shift of the reproduction time.
Even if there is no control flag for controlling the reproduction time and the number of reproductions, if the first recording medium 32 is set to a hard disk drive, DRAM, or the like, it is fixed to the receiver 22, so that it can be viewed by other reproduction devices. It becomes difficult to use other than personal time shift.

  The digital signal received or reproduced from the first recording medium 32 is output from the fifth switch 26 to the first switch 3 and the second recording medium 23. The fifth switch 3 selects the output of the fifth switch 26 at the time of reception or reproduction from the first recording medium 32, and the received or reproduced digital signal is input to the digital signal decoding device 4. Then, the copy guard insertion device 5 inserts a copy guard signal at the time of analog output as necessary and is input to the digital / analog converter 7 via the buffer 6 and converted to an analog signal for monitoring and monitoring. Output to the speaker 24. The copy guard insertion device 5 may be after the buffer 6 or after the digital / analog converter 7.

  Next, the operation in the recording / reproducing apparatus 23 will be described. In the recording control, the following operation is performed. The control flag is detected by the second control flag detector 13 from the digital signal from the receiver 22. For example, the control flag is a copy control flag, which is Never Copy, Copy Once, or Copy Free. When the second control flag detection device 13 detects Never Copy, the third control device 14 shuts off the second switch 12 and ends the recording operation. When the second control flag detection device 13 detects Copy Once, the third control device 14 connects the receiver 22 to the copy information insertion device 15 by the second switch 12 and outputs the digital signal output from the receiver 22. A copy control flag corresponding to No More Copy is inserted into the signal. After inserting the copy control flag, the second recording system encoder 16 performs modulation so that the recording can be performed on the second recording medium 18, and the third amplifier 17 amplifies and records on the second recording medium 18. . When the second control flag detection device 13 detects Copy Free, the third control device 14 connects the receiver 22 to the second recording system encoder 16 by the second switch 12, and the second control flag 14 without limitation. A digital signal is recorded on a recording medium. If the copy control flag is not detected, the second switch 12 is turned off. If the second control flag detection device 13 takes time to detect the control flag, the second switch 12 may be normally turned on. At this time, a specified time is set, and if it takes more time, it is shut off.

  In the reproduction control, the following operation is performed. When the modulated digital signal is output from the second recording medium 18, it is amplified by the fourth amplifier 19 and demodulated by the second reproduction system encoder 20. The demodulated digital signal detects a control flag such as a copy control flag by the second control flag detection device 13, and further determines whether the second recording medium 18 is a reproduction-only or recordable medium. The controller 14 checks. At the time of reproduction, when the recording medium is exclusively for reproduction, the control flag is only Never Copy and Copy Free. When the recording medium is recordable, only No More Copy and Copy Free are available. As described above, the third control device 14 can record the type of the second recording medium 18 and the copy control flag, and can record the third record in the case of No More Copy or Copy Free, or the reproduction-only Never Copy or Copy Free. Playback is performed with the switch 21 turned on, and playback is performed with the switch 21 turned off otherwise. If the control flag detection time in the second control flag detection device 13 is long, the third switch 21 may be normally turned on. In this case, a prescribed time is provided in the same manner as in the above recording, and if it cannot be determined that reproduction is possible after that time, it is shut off.

  At the time of reproduction, the first switch 3 of the receiver 22 selects the output of the third switch 21 by the second control device 8. When the second recording medium 18 is recordable and is No More Copy or Copy Free, or when the second recording medium 18 is read-only and is Never Copy or Copy Free The reproduced digital signal is decoded by a digital signal decoding device 4, a copy guard insertion device 5 inserts a copy guard signal at the time of analog output as required, and a digital / analog converter via a buffer 6. 7 is converted to an analog signal and output to the monitor speaker 24. As described above, by using the digital signal having the control flag, copy control and reproduction control can be performed on the second recording medium 18.

  As described above, the first recording medium 32 for temporarily recording and the second recording medium 18 for which copy control is performed are functionally separated, so that a time-shift can also be performed for a copy-controlled signal. And copy control can be performed.

  FIG. 4 shows a second embodiment. Reference numeral 37 denotes, for example, a personal computer, which includes a digital signal decoding device 4, a copy guard insertion device 5, a buffer 6, a digital / analog converter 7, and a second control device 8. The personal computer 37 has a built-in second recording medium 18 such as a magneto-optical large capacity recordable disk, and the decoding function and the like in the digital signal decoding device 4 may be executed by software. Reference numeral 36 denotes a PC card to be inserted into the personal computer 37. The card contains the demodulation circuit 2 and the first recording medium 32. The reception function of the PC card 36 may be a data reception function such as a LAN, and the broadcast station 1 may be a server on the LAN.

  FIG. 5 shows details of FIG. Inside the personal computer 37, there are a second control flag detection device 13, a second switch 12, a third control device 14, a third switch 21, a copy guard insertion device 15, a second recording system encoder 16, There are a third amplifier 17, a second recording medium 18, a fourth amplifier 19, a second reproduction system encoder 20, and a third switch 21. Accordingly, the first recording medium 32 in the PC card 36 shown in FIG. 5 can be used as a recording medium for performing temporary recording for time shifting. In this case, the first recording medium 32 is a memory having a volatile or first-in first-out function that can be reproduced only once even if it is not volatile because it can be easily carried with the PC card 36. There should be. The operation of each part is the same as in the case of FIG. The PC card 36 may be connected to the broadcasting station 1 by a cable or an optical fiber.

  FIG. 6 shows a third embodiment. Here, the PC card as the receiver 36 has only the demodulation circuit 2, and the other devices are included in the personal computer as the recording / reproducing device 23. For example, the first recording medium 32 is a hard disk or DRAM in a personal computer, and the second recording medium 18 is an external magneto-optical large capacity recordable disk or the like. Each device in the recording / reproducing device 23 may be realized by a personal computer OS or application software. The PC card 36 and the broadcasting station 1 may be connected by a cable or an optical fiber. The first recording medium 32 and the second recording medium 18 may be a common recording medium.

  FIG. 7 shows a fourth embodiment. Here, the receiver and the recording / reproducing apparatus are integrated. For example, a video deck. The broadcasting station 1 may be connected by a cable or an optical fiber. The first recording medium 32 and the second recording medium 18 may be a common recording medium.

  FIG. 8 shows a fifth embodiment. In FIG. 8, the signal decoded by the digital signal decoding device 4 is output to the recording / reproducing device 23. When the control flag is added to the digital signal by digital watermarking, the information is retained even after decoding, so that it can be detected from the decoded signal. In addition, when added as normal digital information, the digital signal is decoded and the control flag information added to the digital signal may be added again to the decoded signal. At the time of recording, the second control flag detection device 13 detects the control flag and sends a detection signal to the third control device 14. The second switch 12 causes the digital signal decoding device 4 and the first recording encoder 16 to be transmitted. Recording is controlled by connecting and disconnecting. At the time of reproduction, the control flag detection device 13 detects the control flag from the decoded digital signal from the second reproduction system encoder 20, and sends the detection signal from the control flag detection device 13 to the third control device 14. The third control device 14 sends a control signal to the third switch 21, and the third switch 21 connects and disconnects the second reproduction system encoder 20 and the first switch 3 by the control signal. Thus, playback is controlled. As a result, copy control can be performed also in recording and reproduction of a signal obtained by decoding a digital signal.

  FIG. 9 shows a bit configuration example of the control flag. The copy control flag is expressed by 2 bits, the Temp. Copy flag is 1 bit, the recording medium flag is 1 bit, the playback time flag is 1 bit, the playback period flag is 2 bits, and the playback count flag is 2 bits. The Temp. Copy flag, the recording medium flag, and the reproduction time flag are “1” or “0”. For example, the recording medium flag records on a removable recording medium such as a large capacity recording / reproducing optical disk. “0” is set to permit, and “1” is set to allow recording only on a recording medium such as a hard disk drive that cannot be taken out. Also, the playback time flag is set to “1” when playback is possible until 9:00 on the recording date, and is set to “0” when there is no limit. There are four playback period flags and playback count flags from “0” to “3”. For example, playback can be performed up to 1 hour, 4 hours, 24 hours, and 48 hours after recording, or 1, 2 It can be played up to 3, 4 times. Each flag may be set more finely, or not all flags may be added.

DESCRIPTION OF SYMBOLS 1 ... Broadcasting station, 2 ... Demodulation circuit, 3 ... 1st switch, 4 ... Digital signal decoding apparatus, 5 ... Copy guard insertion apparatus, 6 ... Buffer, 7 ... Digital / analog converter, 8 ... second control device, 12 ... second switch, 13 ... control flag detection device, 14 ... third control device, 15 ... copy Information insertion device, 16 ... second recording system encoder, 17 ... third amplifier, 18 ... second recording medium, 19 ... fourth amplifier, 20 ... second Reproduction system encoder, 21 ... third switch, 22 ... receiver, 23 ... recording / reproduction device, 24 ... monitor or speaker, 26 ... fifth switch, 27 ... First control flag detection device, 28 ... sixth switch, 29 ... first control device, 30 First recording system encoder 31 ... first amplifier 32 ... first recording medium 33 ... second amplifier 34 ... first reproduction system encoder 35 ... Seventh switch, 36 ... PC card, 37 ... PC

Claims (37)

In a digital signal recording / reproducing apparatus for recording an input digital signal on a recording medium and reproducing from the recording medium,
A control flag related to temporary copy permission is added to the input digital signal.
A recording circuit for recording the digital signal on a first recording medium;
A reproducing circuit for reproducing the digital signal from the first recording medium;
A detection control circuit that detects the control flag and controls the recording circuit and the reproduction circuit;
The detection control circuit causes the digital signal to be temporarily recorded on the first recording medium based on the condition of the control flag.   When the input digital signal is recorded on the first recording medium, a new control flag is added to the digital signal, and when the digital signal is reproduced from the first recording medium, reproduction is performed based on the condition of the new control flag. The digital signal recording / reproducing apparatus according to claim 1, wherein:   2. The digital signal recording / reproducing according to claim 1, wherein the detection control circuit further records the digital signal reproduced from the first recording medium on a second recording medium based on the condition of the control flag. apparatus.   The control flag includes a recording medium flag indicating information on a type of recording medium permitted to be recorded, and recording is permitted when the first recording medium is a recording medium designated by the recording medium flag. The digital signal recording / reproducing apparatus according to claim 1.   The control flag includes a reproduction time flag indicating information relating to a time at which reproduction is permitted, and permits reproduction from the first recording medium before the time indicated by the reproduction time flag. Or the digital signal recording / reproducing apparatus according to 2.   2. The control flag includes a reproduction period flag indicating information relating to a period during which reproduction is permitted, and permits reproduction from the first recording medium within a period indicated by the reproduction period flag. Or the digital signal recording / reproducing apparatus according to 2.   The control flag includes a reproduction number flag indicating information related to the number of times reproduction is permitted, and permits reproduction from the first recording medium within the number indicated by the reproduction number flag. Or the digital signal recording / reproducing apparatus according to 2.   The control flag includes a recording medium flag indicating information on a type of recording medium permitted to be reproduced, and permits reproduction when the first recording medium is a recording medium designated by the recording medium flag. The digital signal recording / reproducing apparatus according to claim 1 or 2.   Even if the control flag includes copy information indicating copy prohibition, if a temporary copy flag that permits temporary recording on the first recording medium is detected, the digital signal is output to the first recording medium. 3. The digital signal recording / reproducing apparatus according to claim 1, wherein control for recording is performed.   Even if the control flag includes copy information indicating copy prohibition, if any one of the reproduction time flag, the reproduction period flag, the reproduction number flag, and the recording medium flag is detected, 9. The digital signal recording / reproducing apparatus according to claim 5, wherein control for recording the digital signal on one recording medium is performed.   7. The digital signal recording / reproducing apparatus according to claim 6, wherein the digital signal is erased after a period indicated by the reproduction period flag.   8. The digital signal recording / reproducing apparatus according to claim 7, wherein the digital signal is erased when the number of reproductions indicated by the reproduction number flag is exceeded.   4. The digital signal according to claim 3, wherein when the control flag indicates that a digital signal cannot be recorded on the first recording medium, control is performed so that the digital signal is not recorded on the second recording medium. Signal recording / playback device. In a digital signal receiving apparatus for receiving a transmitted digital signal and outputting the digital signal to a recording / reproducing apparatus,
The received digital signal is provided with a control flag regarding temporary copy permission,
A detection control circuit for detecting the control flag and controlling the recording / reproducing apparatus;
The detection control circuit causes the recording / reproducing apparatus to temporarily record the digital signal on a recording medium based on the condition of the control flag.   15. The digital signal receiving apparatus according to claim 14, wherein the detection control circuit performs reproduction control for reproducing from the recording medium based on a condition of the control flag.   The detection control circuit assigns a new control flag to the digital signal when recording the input digital signal on the recording medium, and reproduces based on the condition of the new control flag when reproducing from the recording medium. The digital signal digital signal receiving apparatus according to claim 15, wherein:   16. The digital signal receiving apparatus according to claim 15, wherein the digital signal reproduced from the recording medium is recorded on a second recording medium based on the condition of the control flag.   The control flag includes a recording medium flag indicating information on a type of recording medium permitted to be recorded, and the detection control circuit permits recording when the recording medium is a recording medium designated by the recording medium flag. The digital signal receiving apparatus according to claim 14, wherein:   The control flag includes a reproduction time flag indicating information related to a time at which reproduction is permitted, and the detection control circuit permits reproduction from the recording medium before the time indicated by the reproduction time flag. The digital signal receiving apparatus according to claim 15.   The control flag includes a reproduction period flag indicating information relating to a period during which reproduction is permitted, and the detection control circuit permits reproduction from the recording medium within a period indicated by the reproduction period flag. The digital signal receiving apparatus according to claim 15.   The control flag includes a reproduction number flag indicating information on the number of times reproduction is permitted, and the detection control circuit permits reproduction from the recording medium within the number indicated by the reproduction number flag. The digital signal receiving apparatus according to claim 15.   The control flag includes a recording medium flag indicating information on a type of recording medium permitted to be reproduced, and the detection control circuit permits reproduction when the recording medium is a recording medium designated by the recording medium flag. The digital signal receiving apparatus according to claim 15, wherein:   The detection control circuit detects the temporary copy flag that permits temporary recording on the recording medium even if the control flag has copy information indicating copy prohibition, and outputs the digital signal to the recording medium. 15. The digital signal receiving apparatus according to claim 14, wherein recording control is performed.   16. The digital signal receiving apparatus according to claim 14, wherein the detection control circuit erases a digital signal recorded on the recording medium based on a condition of the control flag.   25. The digital signal receiving apparatus according to claim 24, wherein the detection control circuit erases the digital signal when a predetermined period has elapsed.   25. The digital signal receiving apparatus according to claim 24, wherein the detection control circuit erases the digital signal when the number of reproductions exceeds a predetermined number. In a digital signal transmission method for transmitting a digital signal to a digital signal receiver,
A digital signal transmission characterized in that a control flag relating to temporary copy permission is added to the digital signal to control when the receiving device temporarily records the digital signal on a recording medium. Method.   28. The digital signal transmission method according to claim 27, wherein the control flag includes information for performing reproduction control for reproduction from the recording medium by the digital signal receiving apparatus.   28. The digital signal transmission method according to claim 27, wherein the control flag includes a recording medium flag indicating information on a type of recording medium permitted to be recorded.   29. The digital signal transmission method according to claim 28, wherein the control flag includes a reproduction time flag indicating information regarding a time at which reproduction is permitted.   The digital signal transmission method according to claim 28, wherein the control flag includes a reproduction period flag indicating information regarding a period during which reproduction is permitted.   29. The digital signal transmission method according to claim 28, wherein the control flag includes a reproduction number flag indicating information regarding the number of times reproduction is permitted.   The digital signal transmission method according to claim 28, wherein the control flag includes a recording medium flag indicating information on a type of a recording medium permitted to be reproduced.   28. The digital signal transmission method according to claim 27, wherein the control flag includes a temporary copy flag that permits temporary recording even when copying is prohibited.   29. The digital signal transmission method according to claim 27 or 28, wherein the control flag includes information on a condition for erasing a digital signal recorded on the recording medium.   36. The digital signal transmission method according to claim 35, wherein the condition for erasing the digital signal is to erase the digital signal when a predetermined period has elapsed.   36. The digital signal transmitting method according to claim 35, wherein the condition for erasing the digital signal is to erase the digital signal when the number of reproductions exceeds a predetermined number.

Images