Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-12-12
2002-05-14
Chevalier, Robert (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C360S015000
Reexamination Certificate
active
06389220
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method, device, and information signal recording medium for duplication control, for example, in which a video signal recorded in a recording medium is played back, the played back video signal is transmitted with information for preventing duplication together, the transmitted information signal is received to control or inhibit the recording of the information signal in another recording medium.
2. Description of Related Art
VTR (Video Tape recording devices) has been popularized in daily life, and many kinds of software which can be played back on a VTR are supplied abundantly. Digital VTR or DVD (Digital Video Disks) playback devices have been available commercially, and provide images and sound of exceptionally high quality.
On the other hand, there is, however, a problem in that this great abundance of software can be copied without restriction, and several methods have already been proposed to inhibit duplication.
For example, though the method is a method which inhibits duplication of an analog video signal not directly, one method to prevent copying uses a difference in the AGC (Automatic Gain Control) system, or in the APC (Automatic Phase Control) system, for example, between the VTR recording device and a monitor receiver for displaying the image.
For example, the method which utilizes the difference in AGC system, in which a VTR performs AGC using a pseudo sync signal inserted in the video signal and a monitor receiver employs a different AGC system not using the pseudo sync signal, is an example of the former, in detail, when an analog video signal is recorded in an original recording medium. A very high level pseudo sync signal is previously inserted as a sync signal for AGC, and the very high level pseudo sync signal is inserted in the video signal to be supplied from a playback VTR to a recording VTR as a sync signal for AGC.
VTR performs APC using the phase of the color burst signal itself in the video signal and the monitor receiver employs a different APC. The method which utilizes the difference in APC is an example of the latter, in detail, the phase of the color burst signal of a video signal is previously inverted partially when the analog video signal is recorded in an original recording medium, and the color burst signal having partially inverted phase is outputted as a video signal to be supplied from a playback VTR to a recording VTR.
As the result, the monitor receiver which receives the analog video signal from the playback VTR plays back the image correctly without being affected by the pseudo sync signal in AGC or without desired affection of the partial phase inversion of the color burst signal used for APC.
On the other hand, in a VTR, which is supplied with the analog video signal from the playback VTR into which pseudo sync signals have been inserted or which has been subjected to color burst signal phase inversion control as described herein above, for receiving such analog video signal and for recording the analog video signal in a recording medium, proper gain control or phase control based on the input signal cannot be performed, and so the video signal is not correctly recorded. Even if this signal is played back, therefore, normal picture and sound cannot be obtained.
As described herein above, in the case that involves an analog video signal, the prevention is not a method for directly inhibiting duplication but is a method for viewing an abnormally played back picture which can not viewed normally. Such prevention method is a passive duplication prevention control.
On the other hand, in the case that digitized information, for example, video signal is involved, an anti-duplication signal or an anti-duplication control signal comprising, for example, a duplication ranking control code, is added as digital data to the video signal and recorded on the recording medium, so as to prevent or control duplication of the image.
FIG. 1
is a basic structural diagram of a duplication apparatus for duplicating digitized information, a digital information played back by the digital playback device
110
is sent to a digital recording device
120
through a digital transmission line
101
, and the digital recording device
101
duplicates the digital information if duplication is permitted and does not duplicate the digital information if duplication is not permitted.
An anti-duplication control information in the form of additional information is recorded in a recording medium
111
placed on the digital playback device
110
in addition to a digital main information. The anti-duplication control information indicates control content such as duplication inhibition, duplication permission, or generation restriction. The digital playback section
113
reads out the information from the recording medium
111
, acquires the anti-duplication control information together with the digital main information, and sends them to the digital recording medium
120
through the digital transmission line
101
.
An anti-duplication control signal detection section
122
of the digital recording device
120
detects the anti-duplication control signal out of the information items received from the digital transmission line
101
, and judges the control content. The decision result is sent to a digital recording section
121
.
If the decision result of the anti-duplication control signal from the anti-duplication control signal detection section
122
indicates permission of recording of the digital information inputted through the digital transmission line
101
, then the digital recording section
121
converts the input digital signal to a digital information suitable for recording, and writes it in the recording medium
123
, that is, recording is performed. On the other hand; if the decision result of the anti-duplication control signal from the anti-duplication control signal detection section
122
indicates duplication inhibition, then the digital recording section
121
does not perform recording processing of the input digital information.
Further, if the decision result of the anti-duplication control signal from the anti-duplication control signal detection section
122
indicates permission of recording of only the first generation, then the digital recording section
121
converts the input digital signal to a digital information suitable for recording, and writes it in the recording medium
123
, that is, recording is performed, and additionally, converts the anti-duplication control signal in the form of additional information to a signal for indicating duplication inhibition (duplication inhibition of next generation), and records it in the recording medium
123
. Therefore, the video signal can not be duplicated further using the recording medium
123
in which the information is recorded.
As described herein above, in the case of digital connection that the main information signal and anti-duplication control signal added as an additional information are supplied to a recording device in the form of digital signal, because the anti-duplication control signal is contained in the digital data to be transmitted, duplication prevention control such as duplication inhibition is performed consistently in a recording device using the anti-duplication control signal.
In the case that the digital playback device in
FIG. 1
is, for example, a digital VTR, to monitor the played back video signal and audio signal, only both the video signal, that is the main information signal, and audio signal are converted to an analog signal through a D/A conversion circuit
113
and guided to an analog output terminal
114
connected usually to a monitor receiver.
As described herein above, though the playback device is a device for playing back digital signals, the anti-duplication control signal is not contained in the analog signal guided to the analog output terminal
114
. Therefore, in the case of analog connection in which an analog device such as analog VTR is connected to the ana
Ogino Akira
Sugita Takehiro
Usui Takashi
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