JP3829574B2 - Digital signal output method and apparatus - Google Patents

Description

【００２３】
出力方法１では、信号のコピー制御をコピー制限が厳しくないもの、すなわち、コピー可とし、そのコピー制限で出力可能な信号、すなわち、映像信号、音声信号のみを出力する。これにより、出力される信号は制限されるが、コピーの制限を緩和することができる。
【００２４】
出力方法２では、信号のコピー制御をコピー制限が厳しいもの、すなわち、１回コピー可とし、そのコピー制限で出力可能な信号、すなわち、映像信号、音声信号、データ信号を出力する。これにより、コピーの制限は厳しくなるが、多くの信号を出力あるいは記録することができる。さらに、出力された信号をモニタ装置２３０等で復号して表示する場合に、全ての信号が出力されているので、信号出力装置２００で受信した信号を復号する場合と同一の機能を実現することができる。
【００２５】
なお、出力可能な信号を全て出力しなくてもよい。例えば、出力方法２において、データ信号が映像信号あるいは音声信号に直接関係のあるものと直接関係のないものがある場合に、直接関係のないデータは出力しないようにしてもよい。
【００２６】
出力時あるいは記録時の信号全体のコピー制御情報は、デジタルインターフェースの出力信号あるいは記録媒体への記録信号上の所定の位置、例えば、ヘッダ領域等に付加すればよい。もちろん、付加するコピー制御情報は同一の情報を表すものであれば異なる形式であってもよい。
【００２７】
出力方法１と出力方法２のどちらを用いるかは、装置の機能として予め設定しておいてもよいが、ユーザが設定できるようにしておくことにより、より多くの場合に対応することが可能となる。設定方法としては、装置の機能の設定で、どの出力方法を用いるか、あるいは、どの出力方法を標準の出力方法とするかを設定することができる。さらには、標準の出力方法が設定されている場合、あるいは、設定がされていないか設定の機能がない場合に、信号によってコピー制御情報が異なっている場合には、そのことを、モニタ装置等にメッセージとして表示し、あるいは、選択画面として表示し、ユーザがどの出力方法を用いるかを選択できるようにすることができる。例えば、コピーの制限をしたくない場合は出力方法１を選択し、多くの信号を記録したい場合、あるいは、コピー以外の他のモニタ装置での復号等を行う場合は出力方法２を選択すればよい。また、予め設定してある場合、あるいは、選択した時に、設定あるいは選択した出力方法を表示するようにしてもよい。
【００２８】
なお、設定あるいは選択は、図示していないが、デジタル信号出力装置２００のキーあるいはリモートコントローラ等によって、制御回路２０６を制御して行えばよい。また、デジタルインターフェースによって、他の装置から設定あるいは選択することこともできる。
【００２９】
表２は、出力方法の第２の例である。
【００３０】
【表２】

【００３１】
表２では、２種類の音声があり、全体はコピー可であるが、第２音声信号は１回コピー可、データ信号はコピー禁止となっている。この場合には、３種類の出力方法が選択あるいは設定可能である。出力方法１では、信号のコピー制御をコピー可とし、そのコピー制限で出力可能な信号、すなわち、映像信号、第１音声信号のみを出力する。出力方法２では、信号のコピー制御をコピー制限を１回コピー可とし、そのコピー制限で出力可能な信号、すなわち、映像信号、第１音声信号、第２音声信号を出力する。出力方法３では、信号のコピー制御をコピー禁止とし、そのコピー制限で出力可能な信号、すなわち、映像信号、第１音声信号、第２音声信号、データ信号を出力する。出力方法３ではコピーはできないが、出力された信号をモニタ装置２３０で復号して表示する場合等に有効である。
【００３２】
なお、設定あるいは選択は、３種類全てができるようにしてもよいし、その内の２種類、例えば、出力方法１と出力方法３のいずれかができるようにしてもよい。
【００３３】
表３は、出力方法の第３の例である。
【００３４】
【表３】

【００３５】
表３では、全体はコピー禁止であるが、データ信号はコピー可となっている。この場合には、２種類の出力方法が選択あるいは設定可能である。出力方法１では、信号のコピー制御をコピー可とし、そのコピー制限で出力可能な信号、すなわち、データ信号のみを出力する。出力方法１では映像信号及び音声信号のコピーはできないが、図示していないがデジタル信号出力装置２００にコンピュータ等が接続されており、そこでデータ信号の処理を行う場合等に有効である。出力方法２では、信号のコピー制御をコピー禁止とし、そのコピー制限で出力可能な信号、すなわち、映像信号、音声信号、データ信号を出力する。出力方法２ではコピーはできないが、出力された信号をモニタ装置２３０で復号して表示する場合等に有効である。
【００３６】
なお、デジタルインターフェースを複数系統用意し、それぞれ、異なる出力方法で出力することも可能である。例えば、表３の例において、第１系統では出力方法１でモニタ装置２３０に出力し、第２系統では出力方法２でコンピュータに出力することも可能である。複数系統の信号は、複数の端子より出力してもよいが、同一の端子から多重して出力してもよい。
【００３７】
また、ここでは一つのプログラムマップテーブルで認識される信号について説明したが、複数のプログラムマップテーブルで認識される信号、例えば、図４の第１チャンネルと第２チャンネルをデジタルインターフェースより出力する場合においても、それぞれのチャンネルのコピー制御情報が異なる時には、同様に複数の出力方法の内のいずれかを設定あるいは選択して出力することができる。
【００３８】
さらには、出力端子２０８より出力される映像信号や音声信号においてもコピー制御を行うことが考えられるが、この場合には、その映像信号または音声信号のコピー制御情報によってコピー制御を行えばよい。複数の映像信号または音声信号を組合せて出力する場合には、主となる映像信号または音声信号のコピー制御情報に従ってもよいし、もっとも厳しいコピー制御情報に従ってもよい。
【００３９】
図５は、デジタル信号記録再生装置２２０がデジタルＶＴＲである場合の構成例である。図５は記録再生兼用の装置であるが、もちろん、記録と再生が独立していても同様である。１００は回転ヘッド、１０１はキャプスタン、１０２ａは記録時の記録信号の生成を行う記録信号処理回路、１０２ｂは再生時の再生信号の復調を行う再生信号処理回路、１０４は記録再生モード等の制御を行う、例えば、マイクロプロセッサのような制御回路、１０５は回転ヘッド１００の回転等の基準となるタイミング信号を生成するタイミング生成回路、１０６は回転ヘッド及びテープの送り速度を制御するサーボ回路、１１１は磁気テープである。
【００４０】
記録時には、入出力端子２１１より入力されたパケットデータは、記録信号処理回路１０２ａ及び制御回路１０４に入力される。制御回路１０４では、パケットデータの情報によりパケットデータの種類等を検出し、検出結果によって記録モードを判断し、記録信号処理回路１０２ａ及びサーボ回路１０６の動作状態を設定する。また、コピー制御情報により、コピーの制御を行う。コピー可の時にはそのまま記録し、１回コピー可の時にはコピー制御情報をコピー禁止に変更して記録し、コピー禁止の時には記録を停止する。記録信号処理回路１０２ａでは、制御回路１０４で判断された記録状態に応じて、誤り訂正符号、ＩＤ情報、サブコード等の生成を行い、記録信号を生成して回転ヘッド１００により磁気テープ１１１に記録する。
【００４１】
再生時には、まず、再生信号処理回路１０２ｂでＩＤ情報を検出する。そして、制御回路１０４でどのような状態で記録されたかを判断し、再生信号処理回路１０２ｂ及びサーボ回路１０６の動作状態を再設定して再生を行う。再生信号処理回路１０２ｂでは、回転ヘッド１００より再生された再生信号より、同期信号の検出、誤り検出訂正等を行い、出力端子１０８ｂより出力する。
【００４２】
図６は、１トラックの記録パターンである。３は時間情報、プログラム情報等のサブコードを記録するサブコード記録領域、７はデジタル圧縮映像信号を記録するデータ記録領域、２及び６はそれぞれの記録領域のプリアンブル、４及び８はそれぞれの記録領域のポストアンブル、５はそれぞれの記録領域の間のギャップ、１及び９はトラック端のマージンである。
【００４３】
図７はデータ記録領域７のブロック構成である。２０は同期信号、２１はＩＤ情報、２２はデータ、２３は第１の誤り検出訂正のためのパリティ（Ｃ１パリティ）である。例えば、同期信号２０は２バイト、ＩＤ情報２１は３バイト、データ２２は９９バイト、パリティ２３は８バイトで構成されており、１ブロックは１１２バイトで構成されている。
【００４４】
図８は、データ記録領域７における１トラックのデータの構成である。なお、ここでは、図７の同期信号２０およびＩＤ情報２１は省略している。データ記録領域７は、例えば、３３６ブロックで構成されており、最初の３０６ブロックにデータ４１を、次の３０ブロックに第２の誤り訂正符号（Ｃ２パリティ）４３を記録する。Ｃ２パリティ４３は、例えば、６トラック単位で、３０６ブロック×６トラックのデータを１８分割し、それぞれの１０２ブロックに１０ブロックのＣ２パリティを付加する。誤り訂正符号は、例えばリードソロモン符号を用いればよい。各ブロック９９バイトのデータは、３バイトのコピー制御情報等よりなうヘッダ４４と９６バイトのデータ４１により構成されている。
【００４５】
図９は、本発明のデジタル信号出力装置の他の実施例である。図９では、デジタル信号記録再生装置２２０を内蔵しており、記録信号は選択回路２０４から直接デジタル信号記録再生装置２２０に入力される。この場合には、デジタルインターフェースからの出力方法とデジタル信号記録再生装置２２０への記録信号の出力方法を独立して設定あるいは選択できる。例えば、表１の例において、記録は出力方法１で行い、デジタルインターフェースからの出力は出力方法２でモニタ装置２３０等に出力することができる。
【００４６】
【発明の効果】
本発明によれば、同時に出力あるいは記録する複数の映像や音声、データ等の信号でコピー制御の内容が異なる場合においても、記録あるいは外部の表示装置への伝送等の目的に対応させてコピー制御情報及び出力する信号を設定あるいは選択することにより、その目的に最適な信号の出力を実現することができる。
【図面の簡単な説明】
【図１】本発明のデジタル信号出力装置を記録装置及び表示装置と接続した時の構成図である。
【図２】デジタル映像圧縮信号のパケットの構成図である。
【図３】パケットヘッダの構成図である。
【図４】デジタル放送の伝送信号及び伝送信号より選択された信号の構成図である。
【図５】デジタル信号記録再生装置の構成例である。
【図６】１トラックの記録パターンを示す図である。
【図７】データ記録領域のブロックの構成図である。
【図８】データ記録領域における１トラックのデータの構成図である。
【図９】本発明のデジタル信号出力装置の他の構成図である。
【符号の説明】
７１…パケット、２００…デジタル信号出力装置、２０１…復調回路、２０２…選択回路、２０３…復号回路、２０４…選択回路、２０５…インターフェース回路、２０６…制御回路、２１０…モニタ装置、２２０…デジタル信号記録再生装置、２３０…モニタ装置、２３１…選択回路、２３２…復号回路、２３３…モニタ、３０６…パケットヘッダ、３０７…パケット情報、５０５…パケットＩＤ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an output method and apparatus for outputting a digital signal from a digital interface, and more particularly to an output method and apparatus for outputting a digital video or audio signal.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 9-247616 discloses a digital broadcast receiving method for outputting a received digital broadcast signal from a digital interface and performing copy control when the output signal is recorded on a recording apparatus. In this digital broadcast receiving method, in a digital broadcast receiving system in which a digital signal received and demodulated by a digital broadcast receiving device is input to a recording device via a digital interface and recorded, a recording permission signal is inserted into the broadcast signal. When broadcasting and receiving, the recording permission signal is detected and copy control is performed.
[0003]
[Problems to be solved by the invention]
However, no consideration is given to the case where the content of copy control differs depending on the video, audio, data, etc. that are simultaneously output or recorded. Further, the case where data is simultaneously transmitted to the recording device and the display device through a digital interface is not considered.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a digital signal output method capable of performing copy control even when the contents of copy control differ depending on video, audio, data, etc., or when data is simultaneously transmitted to a recording device and a display device through a digital interface To provide an apparatus.
[0005]
[Means for Solving the Problems]
The above object can be achieved by the configurations described in the claims .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
FIG. 1 shows an embodiment when the digital signal output device of the present invention is connected to a recording device and a display device.
[0008]
200 is a digital signal output device that receives a digital broadcast signal and outputs it from a digital interface, 201 is a demodulation circuit that demodulates the received digital broadcast signal, 202 is a selection circuit for decoding, 203 is a decoding circuit, and 204 is digital Selection circuit for interface output, 205 is an interface circuit, 206 is a control circuit, 210 is a monitor device, 220 is a digital signal recording / reproducing device such as a digital VTR or a digital disk recorder, and 230 has a digital interface and a decoding circuit. A monitor device, 231 is a selection circuit, 232 is a decoding circuit, and 233 is a monitor.
[0009]
The digital broadcast signal is transmitted as a compressed digital video signal, digital audio signal, or the like in packet format, and a signal obtained by time-division multiplexing a signal of one channel or a signal of a plurality of channels. When digital broadcasting is received, the received radio wave received by the antenna is input to the demodulation circuit 201 from the input terminal 207. The demodulator circuit 201 demodulates radio waves having a frequency to be received, demodulates the digital broadcast signal, and outputs the demodulated signal to the selection circuits 202 and 204. The selection circuit 202 selects a digital video signal, digital audio signal, or digital data signal of a channel received from the digital broadcast signal. The digital video signal and the digital audio signal are output to the decoding circuit 203, converted into an analog video signal and an analog audio signal, and output from the output terminal 208 to the monitor device 210. Note that the decoded video signal or audio signal may be output as a digital signal without being converted into an analog signal. The digital data signal is input to the control circuit 206, and processing such as addition of data information to the video signal, for example, addition of caption information, is performed. The selection circuit 204 selects a signal output from the digital interface, adds and corrects a signal necessary for output from the interface, and outputs the signal to the interface circuit 205. The interface circuit 205 outputs the signal to the digital signal recording device 220 via the output terminal 209 and records it. In addition, the data is output to the monitor device 230. The selection circuit 231 and the decoding circuit 232 incorporated in the monitor device 230 perform the same operation as the selection circuit 202 and the decoding circuit 203 to decode the digital video signal and the digital audio signal. Although not shown, a digital data signal can be processed by a control circuit similar to the control circuit 206.
[0010]
When the digital signal recorded in the digital recording / reproducing apparatus 220 is reproduced, the digital signal reproduced from the digital recording / reproducing apparatus 220 is input to the selection circuit 202 via the interface circuit 205. Then, the same processing as when receiving the digital broadcast signal is performed, and decoding is performed. Further, the monitor device 230 may perform decoding.
[0011]
Note that a digital broadcast signal is not a signal obtained by adding a digital audio signal and a digital data signal to a digital video signal, but a signal obtained by adding a digital audio signal to a digital video signal or a digital data signal added to a digital audio signal. May be added.
[0012]
Further, the device may be a device in which the digital signal output device 200 and the digital signal recording / reproducing device 220 or the monitor device 210 are integrated. Furthermore, the digital signal output device may not be a device that outputs a received digital broadcast signal, but may be a device that outputs a signal reproduced from a recording medium, for example.
[0013]
FIG. 2 shows the structure of a digital broadcast signal packet. One packet is composed of a fixed length, for example, 188 bytes, and is composed of a 4-byte packet header 306 and 184-byte packet information 307. The digital video signal is arranged in the packet information 307 area. The packet header 307 includes information such as the type of packet information.
[0014]
FIG. 3 shows the configuration of the packet header 306. Reference numeral 501 denotes a synchronization byte indicating the head of the packet, 502 an error display indicating whether there is an error, 503 a unit start display indicating the start of the unit, 504 a packet priority indicating the importance of the packet, and 505 a packet indicating the packet type ID, 506 is a scramble control indicating the presence / absence of scramble, 507 is an adaptation field control indicating the presence / absence of additional information and the presence / absence of packet information, and 508 is a cyclic counter that is counted up in units of packets.
[0015]
FIG. 4A is a configuration example of a transmission signal for digital broadcasting. 71 is the packet of FIG. Usually, information on a data signal program is added to the video signal and audio signal, and a program of a plurality of channels is time-division multiplexed and transmitted. FIG. 4A shows an example in which three-channel programs are multiplexed. V1, V2, and V3 are video signals of the respective channels, A1, A2, and A3 are audio signals of the respective channels, and D1 is the first channel. Data signal packet. Note that video, audio, or data may be composed of a plurality of video or audio in one channel. P0, P1, P2, and P3 are information relating to the program. Each packet is assigned a different packet ID 505, whereby the contents of the packet can be identified.
[0016]
P0 is information related to the entire transmission signal in FIG. 4A, and is a program association table for recognizing which packet ID is assigned to each program. P1, P2, and P3 are information relating to each program, and a program comprising information for recognizing which packet ID is assigned to the video packet, audio packet, etc. of the channel, copy control information of each signal, etc. It is a map table. Usually, a fixed value, for example, 0 is assigned to the packet ID of the program association table. SI is service information such as network information and program guide information for identifying which broadcast.
[0017]
Upon reception, the service information is confirmed, and the packet association is recognized in the program map table of the program desired to be received by the program association table, and then the video packet and the audio packet are determined by the program map table of the program to be received. To recognize which packet ID is assigned. Then, the video packet and the audio packet are extracted and decoded. At the same time, copy control is performed when outputting from the digital interface.
[0018]
Of course, the number of channels to be multiplexed may be other than 3, for example, 4 channels, or other information may be multiplexed.
[0019]
FIG. 4B shows only the first channel information and related program information selected from FIG. 4A. FIG. 4C is obtained by changing a part of the packet information from FIG. The information in the program association table is changed to information P0 ′ only for the program that records the information. In addition, information related to the program to be recorded is newly generated and added as SI ′. When the first channel is output from the digital interface, the selection circuit 204 performs this selection and change, and outputs it through the interface circuit 205. Of course, other information may be output.
[0020]
As copy control information, for example, 2-bit information is used to represent three states: copy enabled, copy once, and copy prohibited. When there is no copy control information, it may be indicated that copying is permitted or copying is prohibited. When copying is possible once, the second and subsequent copies can be prohibited by changing the copy control information to copy prohibition when recording. Copy control information includes information for all signals identified in the program map table and information for each signal. However, in a recording device, copy control, that is, whether to record or not, can be controlled only by the entire signal to be recorded.
[0021]
For example, as shown in Table 1, it is conceivable that the entire data can be copied, but only the data signal can be copied once. Here, when there is no designation for each signal, it is based on the entire copy control information. Of course, copy control information may be added to all signals.
[0022]
[Table 1]

[0023]
In the output method 1, the copy control of the signal is not strictly restricted, that is, the copy is permitted, and only signals that can be output with the copy restriction, that is, a video signal and an audio signal are output. As a result, the output signal is limited, but the copy limitation can be relaxed.
[0024]
In the output method 2, the signal copy control has a severe copy restriction, that is, one copy is possible, and signals that can be output with the copy restriction, that is, a video signal, an audio signal, and a data signal are output. As a result, although restrictions on copying become severe, many signals can be output or recorded. Further, when the output signal is decoded and displayed by the monitor device 230 or the like, all the signals are output, so that the same function as when decoding the signal received by the signal output device 200 is realized. Can do.
[0025]
Note that it is not necessary to output all signals that can be output. For example, in the output method 2, when there is a data signal that is not directly related to a video signal or an audio signal, data that is not directly related may not be output.
[0026]
The copy control information of the entire signal at the time of output or recording may be added to a predetermined position on the output signal of the digital interface or the recording signal to the recording medium, for example, a header area. Of course, the added copy control information may be in a different format as long as it represents the same information.
[0027]
Whether to use the output method 1 or the output method 2 may be set in advance as a function of the apparatus, but by allowing the user to set, it is possible to cope with more cases. Become. As a setting method, it is possible to set which output method is used or which output method is set as a standard output method by setting the function of the apparatus. Furthermore, if the standard output method is set, or if the setting is not set or there is no setting function, and copy control information differs depending on the signal, this is indicated by a monitor device or the like. As a message or as a selection screen so that the user can select which output method to use. For example, if you do not want to restrict copying, select output method 1, and if you want to record many signals, or if you want to perform decoding on other monitor devices other than copying, select output method 2 Good. Further, when preset or when selected, the set or selected output method may be displayed.
[0028]
Although setting or selection is not shown, the control circuit 206 may be controlled by a key of the digital signal output device 200 or a remote controller. It can also be set or selected from other devices via a digital interface.
[0029]
Table 2 is a second example of the output method.
[0030]
[Table 2]

[0031]
In Table 2, there are two types of audio, and the whole can be copied, but the second audio signal can be copied once and the data signal is prohibited from being copied. In this case, three types of output methods can be selected or set. In the output method 1, the signal copy control is allowed to be copied, and only the signals that can be output with the copy restriction, that is, the video signal and the first audio signal are output. In the output method 2, the signal copy control is set such that the copy restriction can be made once, and a signal that can be output by the copy restriction, that is, a video signal, a first audio signal, and a second audio signal are output. In the output method 3, copy control of the signal is prohibited, and signals that can be output by the copy restriction, that is, a video signal, a first audio signal, a second audio signal, and a data signal are output. Although the output method 3 cannot be copied, it is effective when the output signal is decoded by the monitor device 230 and displayed.
[0032]
Note that all three types of setting or selection may be performed, or two of them, for example, one of the output method 1 and the output method 3 may be performed.
[0033]
Table 3 is a third example of the output method.
[0034]
[Table 3]

[0035]
In Table 3, copying is prohibited as a whole, but data signals can be copied. In this case, two types of output methods can be selected or set. In the output method 1, the signal copy control is allowed to be copied, and only a signal that can be output with the copy restriction, that is, a data signal is output. Although the output method 1 cannot copy the video signal and the audio signal, although not shown, it is effective when a computer or the like is connected to the digital signal output device 200 and the data signal is processed there. In the output method 2, signal copy control is prohibited from being copied, and signals that can be output with the copy restriction, that is, video signals, audio signals, and data signals are output. Although the output method 2 cannot copy, it is effective when the output signal is decoded by the monitor device 230 and displayed.
[0036]
It is also possible to prepare a plurality of digital interfaces and output them by different output methods. For example, in the example of Table 3, it is possible to output to the monitor device 230 by the output method 1 in the first system and to the computer by the output method 2 in the second system. Multiple systems of signals may be output from a plurality of terminals, but may be multiplexed from the same terminal and output.
[0037]
Further, here, the signals recognized by one program map table have been described. However, in the case of outputting signals recognized by a plurality of program map tables, for example, the first channel and the second channel in FIG. 4 from the digital interface. However, when the copy control information of each channel is different, any one of a plurality of output methods can be similarly set or selected for output.
[0038]
Further, although it is conceivable to perform copy control also for the video signal and audio signal output from the output terminal 208, in this case, the copy control may be performed based on the copy control information of the video signal or audio signal. When a plurality of video signals or audio signals are output in combination, the copy control information of the main video signal or audio signal may be used, or the strictest copy control information may be followed.
[0039]
FIG. 5 shows a configuration example when the digital signal recording / reproducing apparatus 220 is a digital VTR. FIG. 5 shows an apparatus for both recording and reproduction, but it goes without saying that recording and reproduction are independent. Reference numeral 100 denotes a rotary head, 101 denotes a capstan, 102a denotes a recording signal processing circuit that generates a recording signal at the time of recording, 102b denotes a reproduction signal processing circuit that demodulates the reproduction signal at the time of reproduction, and 104 denotes control of a recording / reproducing mode, etc. For example, a control circuit such as a microprocessor, 105 is a timing generation circuit that generates a timing signal serving as a reference for rotation of the rotary head 100, 106 is a servo circuit that controls the feed speed of the rotary head and the tape, 111 Is a magnetic tape.
[0040]
During recording, the packet data input from the input / output terminal 211 is input to the recording signal processing circuit 102 a and the control circuit 104. The control circuit 104 detects the packet data type and the like from the packet data information, determines the recording mode based on the detection result, and sets the operation states of the recording signal processing circuit 102a and the servo circuit 106. Further, copy control is performed based on the copy control information. When copying is possible, recording is performed as is. When copying is possible once, the copy control information is changed to copy prohibition and recording is performed. When copying is prohibited, recording is stopped. The recording signal processing circuit 102a generates an error correction code, ID information, subcode, etc. according to the recording state determined by the control circuit 104, generates a recording signal, and records it on the magnetic tape 111 by the rotary head 100. To do.
[0041]
At the time of reproduction, first, the reproduction signal processing circuit 102b detects ID information. Then, the control circuit 104 determines in what state the recording is performed, and the operation state of the reproduction signal processing circuit 102b and the servo circuit 106 is reset to perform reproduction. In the reproduction signal processing circuit 102b, synchronization signal detection, error detection correction, and the like are performed from the reproduction signal reproduced from the rotary head 100, and output from the output terminal 108b.
[0042]
FIG. 6 shows a recording pattern of one track. 3 is a subcode recording area for recording subcodes such as time information and program information, 7 is a data recording area for recording a digital compressed video signal, 2 and 6 are preambles of the respective recording areas, and 4 and 8 are respective recordings. An area postamble, 5 is a gap between the respective recording areas, and 1 and 9 are margins at the track end.
[0043]
FIG. 7 is a block configuration of the data recording area 7. 20 is a synchronization signal, 21 is ID information, 22 is data, and 23 is a parity (C1 parity) for first error detection and correction. For example, the synchronization signal 20 is 2 bytes, the ID information 21 is 3 bytes, the data 22 is 99 bytes, the parity 23 is 8 bytes, and one block is 112 bytes.
[0044]
FIG. 8 shows the data structure of one track in the data recording area 7. Here, the synchronization signal 20 and the ID information 21 in FIG. 7 are omitted. The data recording area 7 is composed of, for example, 336 blocks, and the data 41 is recorded in the first 306 blocks, and the second error correction code (C2 parity) 43 is recorded in the next 30 blocks. For example, the C2 parity 43 divides the data of 306 blocks × 6 tracks into 18 in units of 6 tracks, and adds 10 blocks of C2 parity to each 102 blocks. For example, a Reed-Solomon code may be used as the error correction code. Each block of 99 bytes of data is composed of a header 44 made up of 3-byte copy control information and the like, and 96-byte data 41.
[0045]
FIG. 9 shows another embodiment of the digital signal output apparatus of the present invention. In FIG. 9, a digital signal recording / reproducing apparatus 220 is built in, and the recording signal is directly input from the selection circuit 204 to the digital signal recording / reproducing apparatus 220. In this case, the output method from the digital interface and the output method of the recording signal to the digital signal recording / reproducing apparatus 220 can be set or selected independently. For example, in the example of Table 1, recording can be performed by the output method 1, and output from the digital interface can be output to the monitor device 230 or the like by the output method 2.
[0046]
【The invention's effect】
According to the present invention, even when the contents of copy control differ among signals such as a plurality of video, audio, and data that are simultaneously output or recorded, copy control is performed in accordance with the purpose of recording or transmission to an external display device. By setting or selecting information and a signal to be output, it is possible to realize output of a signal optimal for the purpose.
[Brief description of the drawings]
FIG. 1 is a configuration diagram when a digital signal output device of the present invention is connected to a recording device and a display device.
FIG. 2 is a configuration diagram of a packet of a digital video compression signal.
FIG. 3 is a configuration diagram of a packet header.
FIG. 4 is a configuration diagram of a digital broadcast transmission signal and a signal selected from the transmission signals.
FIG. 5 is a configuration example of a digital signal recording / reproducing apparatus.
FIG. 6 is a diagram showing a recording pattern of one track.
FIG. 7 is a block diagram of a data recording area block.
FIG. 8 is a configuration diagram of data of one track in a data recording area.
FIG. 9 is another configuration diagram of the digital signal output device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 71 ... Packet, 200 ... Digital signal output device, 201 ... Demodulation circuit, 202 ... Selection circuit, 203 ... Decoding circuit, 204 ... Selection circuit, 205 ... Interface circuit, 206 ... Control circuit, 210 ... Monitor device, 220 ... Digital signal Recording / reproducing apparatus, 230 ... monitor apparatus, 231 ... selection circuit, 232 ... decoding circuit, 233 ... monitor, 306 ... packet header, 307 ... packet information, 505 ... packet ID

Claims (14)

In the digital signal output method of selecting and outputting all or a part of the inputted a (a is a plurality) digital signals,
Each of the a digital signals or n pieces of copy control information is added in a plurality of units, and the n pieces of copy control information are m types (m is an integer equal to or less than n) of copy control information. when either, set one of the combinations from among the m sets of combinations of digital signals overall copy control information with the corresponding output can be one or more of the digital signal to the copy control information to be output or A digital signal output method comprising: selecting and outputting. 2. The digital signal according to claim 1, wherein the n pieces of copy control information include copy information added to all of the plurality of digital signals and copy information added individually to the digital signals. output method. 2. The digital signal output method according to claim 1, wherein when no copy control information is added to the digital signal, it is considered that a specific type of copy control information is added. When setting or selecting one of the copy control information of the entire digital signal to be output and one or a plurality of m combinations of the digital signals that can be output corresponding to the copy control information , 2. The digital signal output method according to claim 1, wherein copy control information is newly added to the entire digital signal to be output. When setting or selecting one combination from among copy control information of the entire digital signal to be output and one or a plurality of m combinations of the digital signals that can be output in correspondence with the copy control information , an external operation is performed. The digital signal output method according to claim 1, wherein: Each of the a digital signals or when n pieces of copy control information are added in a plurality of units, a combination that can be output or a selected combination is displayed on an external or internal display device. The digital signal output method according to claim 1.   2. The digital signal output method according to claim 1, wherein the output digital signal is recorded on a recording medium. In a digital signal output device that selects and outputs all or a part of a number (a is a plurality) of input digital signals,
Each of the a digital signals or n pieces of copy control information is added in a plurality of units, and the n pieces of copy control information are m types (m is an integer equal to or less than n) of copy control information. When one of them, copy control information of the entire digital signal to be output and one or more combinations of the digital signal sets that can be output corresponding to the copy control information are set or selected. A control circuit to
A digital signal output apparatus comprising: a selection circuit that generates an output digital signal by selecting all or a part of the plurality of digital signals according to a combination set or selected by the control circuit.   9. The digital signal output apparatus according to claim 8, wherein the selection circuit newly adds copy control information to the entire output digital signal and outputs it. The control circuit is a combination of copy control information of the entire digital signal output by an external operation and one or a plurality of m combinations of the digital signals that can be output corresponding to the copy control information. 9. The digital signal output apparatus according to claim 8, wherein the digital signal is set or selected. Wherein the control circuit, each of said a number of digital signals, or, when the copy control information in a plurality of units are n pieces added, and displays the output possible combinations, or the selected combination to the outside or inside of the display device 9. The digital signal output device according to claim 8, wherein:   9. The digital signal output device according to claim 8, further comprising a recording device for recording the output signal on a recording medium. In the digital signal output method of selecting and outputting all or a part of the inputted a (a is a plurality) digital signals,
Each of the a digital signals or n pieces of copy control information is added in a plurality of units, and the n pieces of copy control information are m types (m is an integer equal to or less than n) of copy control information. when either, setting a plurality of combinations from among the m sets of combinations of one possible output corresponding digital signals across the copy control information and outputs it to the copy control information or a plurality of the digital signal or A digital signal output method comprising: selecting and outputting a plurality of systems of signals.   14. The digital signal output method according to claim 13, wherein the plurality of systems of signals are multiplexed and output from the same terminal.

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