Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-06-02
2002-03-19
Chevalier, Robert (Department: 2712)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06360052
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device and method for superimposing and adding an time code information on, for example, a video signal, and a device and method for superimposing and adding a time code information and an additional information such as an anti-duplication control information in correlation to the time code information on a video signal.
2. Description of Related Art
The VTR (Video Tape Recorder) has been popularized, a lot of software which is reproducible using a VTR has been provided. Recently, digital playback devices such as digital VTRs and DVDs (Digital Video Disc) are now used practically, and pictures of good quality and sound of good quality can be easily played back and viewed.
However, on the other hand, the popularization gives rise to a problem that such abundant software are duplicated without any restriction, and heretofore various duplication prevention measures have been developed.
For example, though it is a method for inhibiting not directly duplication of analog video signals, a method in which the difference in AGC (Auto Gain Control) system or APC (Auto Phase Control) characteristics between a recording device such as a VTR and a monitor receiver for displaying a picture is utilized to prevent duplication substantially is available.
In detail, for example, a method in which a VTR performs AGC using a pseudo sync signal inserted in an video signal and a monitor receiver employs AGC system not using the pseudo sync signal is an example of the former method, and in the method, an extraordinarily high level pseudo sync signal is previously inserted as a sync signal for AGC when an analog video signal is recorded in an original recording medium, and then the extraordinarily high level pseudo sync signal is inserted in a video signal supplied from a playback VTR to a recording VTR as a sync signal for AGC.
A method utilizing the difference in APC characteristics in which the APC in a VTR follows a color burst signal in a video signal with a short time constant but the APC in a monitor receiver follows with a relatively long time constant is an example of the latter method, and in the method, the phase of a color burst signal of an video signal is previously inverted partially when analog video signals are recorded in an original recording medium, and then the video signal having the partially inverted color burst signal is outputted as a video signal supplied from a playback VTR to a recording VTR.
In the case described herein above, the monitor receiver which receives supply of the analog video signal from the playback VTR plays back a picture normally without receiving an adverse effect of the partial phase inversion of the color burst signal used for the pseudo sync signal and APC.
However, in the VTR which receives supply of the analog video signal having the inserted pseudo sync signal described herein above supplied from the playback VTR or subjected to the phase inversion control of the color burst signal and records the analog video signal in a recording medium, the VTR can not perform gain control or phase control based on the input signal, and records the video signal not normally. Therefore, a normal picture can not be viewed when the recorded video signal is played back.
In the case involving an analog video signal as described herein above, the duplication prevention method is not a method for inhibiting duplication, but a method for obtaining pictures which can not viewed normally, therefore it is said that this method is merely a passive duplication prevention control.
On the other hand, when digitized information, for example, a video signal is involved, a duplication prevention control signal including a duplication prevention code or a duplication generation control code is added to a video signal as a digital data and recorded in a recording medium in order to perform direct duplication prevention control, for example, duplication inhibition.
FIG. 1
is a fundamental structural diagram of a duplication device for processing this digitized information, and the device sends a digital video information played back by a digital playback device
200
to a digital record device
210
through a digital transmission channel
220
, and plays back the digital video information if it is of duplication permitted and inhibits duplication if it is of duplication inhibited.
In a recording medium
201
mounted on the digital playback device
200
, an anti-duplication control information is recorded in addition to the digital video information as an addition information. This anti-duplication control information indicates duplication prohibition, duplication permission, or generation limit as the control content. Digital reproduction unit
202
reads the digital information from the record medium
201
, acquires the playback prevention control information with the digital video information, and sends it to the digital recording device
210
through digital transmission path
220
.
The duplication prevention control signal detection unit
212
of the digital recording device
210
detects the duplication prevention control signal from the information which is received through the digital transmission path
220
, and identifies the control contents. This identification result is transmitted to the digital recording unit
211
.
If the identification result obtained from the duplication prevention control signal supplied from the duplication prevention control signal detection unit
212
is a signal which indicates the permission of recording of the digital video information inputted through the digital transmission path
220
, the digital recording unit
211
converts the above-mentioned input digital video signal into a digital information suitable for recording, and writes it in a recording medium
213
to perform recording. On the other hand, if identification result obtained from duplication prevention control signal supplied from the duplication prevention control signal detection unit
212
is duplication inhibition, the digital record unit
211
does not perform record processing of the above-mentioned input digital video information.
If the identification result obtained from the duplication prevention control signal supplied from the duplication prevention control signal detection unit
212
is a signal which permits only the first generation duplication, the digital record unit
211
converts the above-mentioned input digital signal into digital video information suitable for recording, writes it in the recording medium
213
, and performs recording, and it changes the anti-duplication control signal used as an addition information to a signal for indicating duplication inhibition (duplication inhibition of the next generation), and records it in the recording medium
213
. Accordingly, the video signal cannot be duplicated using the duplicated recording medium
213
As described herein above, in the case of so-called digital connection for supplying a video signal as major information signal and an anti-duplication control signal as an addition information to a recording device in the form of a digital signal, because an anti-duplication control signal is included in the transmitted digital data, the recording device performs duplication prevention control such as duplication inhibition using this anti-duplication control signal consistently.
In the case that the digital playback device of
FIG. 1
is, for example, a digital VTR, the digital VTR converts only the video signal namely the major information signal and sound signal into an analog signal through a D/A conversion circuit
203
in order to monitor the played back video signal and sound signal, and guides it to the analog output terminal
204
, to which usually a monitor television set is connected.
As described herein above, even though a playback device for digital information is involved, the anti-duplication control signal is not included in the analog signal guided to the analog output terminal
204
. Hence, in the case of
Ikeda Nozomu
Ogino Akira
Sugita Takehiro
Chevalier Robert
Maioli Jay H.
Sony Corporation
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