JPH06296259A - Non-level standard signal release device - Google Patents

Abstract

PURPOSE:To release the prevention of dubbing of a high-definition video signal by substituting the high-definition video signal with the output signal of a signal generating means in a period including the period when a non-level reference signal related to a prescribed line specified by a line specifying means is inserted. CONSTITUTION:An input high vision HID signal aa is inputted to one input of a selecting means 4 and a line specifying means 2. This input HID signal aa is obtained by converting R, G, and B signals. The means 2 separates a vertical synchronizing signal and a horizontal synchronizing signal related to the BD signal aa and counts them to supply a line detection signal 2a, which is obtained by specifying the prescribed line where the non-level standard signal should be inserted, to a timing generating means 3. The means 3 generates a control signal 3a in accordance with a prescribed method and sends this signal to the control input of a selecting means 4. A signal la other than prescribed level reference signal and discrimination signal is supplied to the other input of the means 4 from a signal generating means 1, and the non-level standard signal is substituted with the signal 1a in the period when the signal 3a is in the high level, and an output HD signal bb is outputted to a transmission line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-level standard signal canceling device for canceling a non-level standard signal added to a high definition video signal and effective in preventing dubbing.

[0002]

2. Description of the Related Art Hi-vision signals (hereinafter, "HD signals")
Abbreviated. ), In a recording device such as a VTR that records a high-definition video signal in a wide band having a large number of scanning lines as compared with a conventional video signal such as an EDTV signal, in order to prevent the dubbing by causing the input level correction to malfunction. The applicant proposed "non-level standard signal adding device and high-definition signal" in which a non-level standard signal is inserted in a predetermined line of a high-definition video signal in "reference number 405000427" filed on the same day as the present application.

In order to create a recording medium in which a high-definition video signal in which such a non-level standard signal is inserted in a predetermined line is recorded, an HD signal generated from a signal source such as a TV camera or a high definition VTR is used. After passing through the above-mentioned non-level standard signal adding device, a recording medium capable of preventing dubbing may be created by recording with a recording device that does not perform level correction of the input signal using the level standard signal.

[0004]

However, even if the recording medium used in the signal source is accidentally erased or lost, it is also possible to create a duplicate without exceeding the purpose of preventing dubbing. Only the recording medium on which the standard signal is recorded is left. In such a case, inconvenience arises when it is desired to create a duplicate in a recording device that corrects the level of the input signal using the level standard signal.

Therefore, an object of the present invention is to substantially eliminate the non-level standard signal added to the high definition video signal to obtain a replicable high definition video signal.

[0006]

The present invention provides the following configurations in order to solve the above problems.

Instead of the level standard signal having the level reference signal representing the amplitude level and the identification signal for identifying the level reference signal, a non-level reference signal not representing the amplitude level and a non-level reference signal not containing the identification signal are provided. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a level standard signal into a predetermined line related to an effective scanning line, wherein the predetermined level relating to the effective scanning line of the high-definition video signal. Line identifying means for identifying the line and a signal generating means for generating at least the level reference signal, and including a period in which the non-level reference signal for the predetermined line identified by the line identifying means is inserted. A non-level standard signal canceling device, characterized in that the high definition video signal is replaced with an output signal of the signal generating means during a period.

Instead of a level standard signal having a level reference signal representing an amplitude level and an identification signal for identifying the level reference signal, a non-level reference signal not representing an amplitude level and a non-level reference signal having the identification signal are not provided. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a level standard signal into a predetermined line related to an effective scanning line, wherein the predetermined level relating to the effective scanning line of the high-definition video signal. Line identifying means for identifying the line and a signal generating means for generating at least a signal other than the identification signal, and a period during which the identification signal for the predetermined line identified by the line identifying means is inserted. A non-level standard signal canceling device, characterized in that the high-definition video signal is replaced with an output signal of the signal generating means for a period including.

Instead of a level standard signal having a level reference signal representing an amplitude level and an identification signal for identifying the level reference signal, a non-level reference signal not representing an amplitude level and a non-level reference signal having the identification signal are not provided. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a level standard signal into a predetermined line related to an effective scanning line, wherein the predetermined level relating to the effective scanning line of the high-definition video signal. Line identifying means for identifying the line, a signal generating means for generating at least the level reference signal, and an identification signal detecting means for detecting the identification signal, the predetermined line identified by the line identifying means Only when the identification signal is detected, the high-definition video signal is replaced with the output signal of the signal generating means for a period including a period in which the non-level reference signal is inserted. Non-level standard signal cancel device according to symptoms.

Instead of a level standard signal having a level reference signal representing an amplitude level and an identification signal for identifying the level reference signal, a non-level reference signal not representing an amplitude level and a non-level reference signal having the identification signal are not provided. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a level standard signal into a predetermined line related to an effective scanning line, wherein the predetermined level relating to the effective scanning line of the high-definition video signal. Line identifying means for identifying the line, a signal generating means for generating at least a signal other than the identification signal, and an identification signal detecting means for detecting the identification signal, and the predetermined line identified by the line identifying means. The high-definition video signal is replaced with the output signal of the signal generating means for a period including a period in which the identification signal is inserted only when the identification signal is detected on a line. Non-level standard signal cancellation apparatus.

[0011]

1 is a waveform diagram of a non-level standard signal, FIG. 2 is a waveform diagram of another non-level standard signal, and FIG. 3 is a waveform of an HD signal for explaining a line on which the non-level standard signal is inserted. 4 is a block diagram of a non-level standard signal canceling apparatus according to the first embodiment of the present invention, FIG. 5 is a block diagram of a non-level standard signal canceling apparatus according to the second embodiment of the present invention, and FIG. FIG. 6 is a block diagram of a non-level standard signal canceller according to a third embodiment of the invention. Hereinafter, embodiments will be described with reference to the drawings.

The outline of this embodiment is a level standard having amplitude level information of a high definition video signal in a predetermined line (effective scanning line) related to a picture signal other than the vertical blanking period of the high definition video signal. The non-level standard signal inserted in place of the signal is substantially canceled, and the entire non-level standard signal, the non-level reference signal in the non-level standard signal and / or the identification signal in the non-level standard signal are It is to be replaced with another signal. In the present embodiment, an HD signal will be taken up and described as an example of a high definition video signal, but first, a non-level standard signal which is a premise of the present embodiment and a line on which the non-level standard signal is inserted will be explained.

The non-level standard signal has an identification signal and a non-level reference signal, and the following modes are possible. For example, the level standard signal shown in FIG.
The horizontal synchronizing signal is inserted in the period T1, the identification signal is inserted in the period T2 that follows, and the non-level reference signal is inserted in the period T3 that follows. The horizontal synchronizing signal is inserted in a predetermined line of the HD signal. Has been done. This identification signal is the same signal as the identification signal related to the level standard signal, for example, 3
It is a bit signal. The non-level reference signal is N1%
It is composed of a level and a non-reference level of N2% level and a 0% level. Incidentally, the level reference signal corresponding to this is composed of reference levels of 100% level and 50% level and 0% level.

The non-level standard signal shown in FIG. 1B is the horizontal overscan period of the monitor following the identification signal inserted in the period T2 and the period T4 in which the normal picture signal is inserted. A non-level reference signal having a non-reference level of N1% level is inserted in a certain period T3.
The corresponding level reference signal has a reference level of 100% level.

In addition, the non-level standard signal shown in FIG. 1C is the identification signal shown in the period T2, the non-level reference signal shown in the period T3, and the information signal shown in the period T4. It is divided and multiplexed. This non-level reference signal is composed of non-reference levels of N1% level and N2% level and 0% level. Incidentally, the level reference signal corresponding to this is composed of reference levels of 100% level and 50% level and 0% level.

Further, the non-level standard signal shown in FIG. 1 (D) is N level in the non-level reference signal (period T3).
Not only 1% level non-reference level information but also 12-bit information related to the content of the HD signal is multiplexed. Incidentally, the level reference signal corresponding to this has a binary value of 100% level reference level (high level) and 0% level (low level).

Further, the non-level standard signal shown in FIG. 2A is assumed to be the Y signal as the HD signal,
The horizontal synchronization signal relating to the period T1 is inserted subsequently to the period T
2, the identification signal and the information signal inserted in T4, and the non-level reference signal having the non-reference level of N3% level inserted in the subsequent period T3. The level reference signal corresponding to this has a reference level of 75% level.

The identification signal and the information signal inserted during the periods T2 and T4 are made up of, for example, 84 bits, and as shown in FIG. 7C, an 8-bit postamble,
8-bit identification signal, 36-bit data signal, 2
A time code signal relating to an 8-bit input HD signal, and
A bit check code signal and these signals are set to a high level of 75% level and a low level of 25% level. The data signal is information related to the image display format (for example, the presence or absence of a squeeze signal or letterbox signal), information related to the audio mode (for example, distinction between mono, stereo, and two languages), program I.
It has predetermined information relating to the input HD signal such as information relating to D, information relating to subtitles, information relating to editing, and the like.

On the other hand, when the input HD signal is a color difference signal such as a PB signal or a PR signal, the non-level standard signal passes through the horizontal synchronizing signal in the period T1 as shown in FIG. The information signal is inserted during the period T4, and the non-level reference signal is inserted during the period T3 that follows. The identification signal is omitted here because it is possible to identify whether or not the non-level standard signal is inserted in the line by the identification signal inserted in the Y signal transmitted at the same time as the PB signal and the PR signal. . Here, the high level of the information signal is set to 25% level and the low level is set to -25% level, and the non-level reference signal has non-reference levels of M1% level and M2% level. In addition, it is set as follows. The level reference signal corresponding thereto has a reference level of ± 25% level.

Now, in order to explain a predetermined line into which these non-level standard signals are to be inserted, the non-level standard signals are erroneously detected as level standard signals in a recording device such as a VTR, and the amplitude levels are erroneously detected. Since it is also for correcting the level, it is necessary to interpose on the same line as the line on which the level standard signal is interpolated.

Therefore, a predetermined line on which the level standard signal is to be inserted will be considered. The level standard signals are the lines 41 to 66, 53 of the HD signal shown in FIG.
2-557 lines, 603 lines-628 lines and 1
It is inserted in one line or a plurality of lines from 095 lines to 1120 lines. It is necessary to insert the level standard signal in the relevant scanning line because the level standard signal may be deleted by the high-definition device during the synchronizing signal period such as the vertical synchronizing signal and the horizontal synchronizing signal when inserting the level standard signal into the relevant line. This is because the monitor has an overscan characteristic of 8% to 10% for all the scanning lines so that the level standard signal is not displayed on the screen.

By the way, since the number of scanning lines that the monitor overscans actually varies for each device, the level standard signal is inserted in the scanning lines that are effective scanning lines and are unlikely to appear on the screen. It is more desirable to do. In addition, in the HD signal of the studio standard,
The number of effective scanning lines is 1035, and the effective picture period is 41 lines to 557 lines and 603 lines to 1120 lines. On the other hand, the MUSE decoder output signal has 1032 effective scanning lines and the effective picture period is 42 lines. .About.557 lines and 604 lines to 1119 lines. Therefore, the lines 41, 557, 603, 1120 and the lines 42, 604, 557, 1121 are effective scanning lines and have the above-mentioned conditions that are unlikely to appear on the screen, and the level standard signal is applied to the lines. Is more desirable. In addition, 41 lines and 6
The 03 line is the effective scanning line of the studio standard HD signal and is not the effective scanning line of the MUSE decoder output signal. Therefore, assuming that the HD signal is not encoded into the MUSE signal, 41 lines as well as/
Alternatively, it is more desirable to insert a level standard signal in line 603.

Therefore, the non-level standard signal is also inserted in the above-mentioned predetermined line. An embodiment will be described below on the premise of an HD signal in which such a non-level standard signal is inserted in a predetermined line.

(First Embodiment) A method for substantially canceling a non-level standard signal will be described. The difference between the non-level standard signal and the level standard signal is that the non-level reference signal is inserted instead of the level reference signal.
The first method of replacing the non-level reference signal in the non-level standard signal with the regular level reference signal can substantially cancel the non-level standard signal.

Further, as described above, the non-level standard signal has the same identification signal as the level standard signal, and when the recording device detects this identification signal, the non-level standard signal is regarded as the level standard signal and the amplitude level is determined. Is being corrected. Therefore, if the identification signal in the non-level standard signal is replaced with a signal other than the identification signal, the recording device does not correct the amplitude level based on the non-level standard signal.
The non-level standard signal can be substantially canceled also by the method of.

Therefore, a non-level standard signal canceling device that realizes the first and second methods will be described with reference to FIG. In FIG. 4, an input HD signal aa in which a non-level standard signal is inserted in a predetermined line from a transmission line (not shown)
Is supplied to one input of the selection means 4 and the line identification means 2. The input HD signal aa is any one of Y, PB, and PR signals, is a signal conforming to the domestic high-definition signal standard, and is a signal converted from the R, G, B signals by the following formula. .

Y = 0.7154G + 0.0721B + 0.2125R PB = 0.5389 (-0.7154G + 0.9279B-0.2125R) PR = 0.6349 (-0.7154G-0.0721B + 0.7875R) Then, the line identifying means 2 receives the input HD signal aa. The vertical synchronizing signal and the horizontal synchronizing signal are separated and counted, and a line detection signal 2a obtained by specifying a predetermined line through which the non-level standard signal 5a is inserted is supplied to the timing generating means 3.

The timing generation means 3 generates the control signal 3a according to the above-mentioned first and second methods and supplies it to the control input of the selection means 4. Further, the other input of the selecting means 4 is supplied with a predetermined signal 1a described later from the signal generating means 1 and replaces the non-level standard signal with the predetermined signal 1a for a predetermined period in which the control signal 3a is at a high level. The output HD signal is output to a transmission line (not shown).

Now, the case where this non-level standard signal canceling device is related to the above-mentioned first method will be described. As described above, the first method replaces the non-level reference signal in the non-level standard signal with the regular level reference signal, so that the predetermined signal 1a is the level reference signal, and N1, N in FIG.
2, N3, M1, M2% level is 100,50,7 respectively
It is a signal having a normal reference level of 5,25, -25%. Further, the control signal 3a is at the high level during the period T3 in FIG. Therefore, the selection means 4 can output the output HD signal bb obtained by inserting the level reference signal. The period in which the control signal 3a is at the high level may be any period that includes at least the period T3 in which the non-level reference signal is inserted. Further, the predetermined signal 1a may be a level reference signal for at least the period T3.

Next, a case where this non-level standard signal canceling device is related to the above-mentioned second method will be described. As described above, the second method replaces the identification signal in the non-level standard signal with a signal other than the identification signal, so that the predetermined signal 1a is a signal other than the identification signal. For example, the identification signals are "0" and "1".
In the case of being composed of 2 bits, the predetermined signal 1a may have a constant voltage. Further, the control signal 3a is at the high level during the period T2 in FIG. Therefore, the selection means 4 can output the output HD signal bb having no identification signal.
The period in which the control signal 3a is at the high level may be any period that includes at least the period T2 in which the identification signal is inserted. Also, the predetermined signal 1a is at least for the period T2
Any signal other than the identification signal may be used.

(Second Embodiment) The first embodiment is based on the premise that a non-level standard signal is inserted in the line specified by the line specifying means 2. However, in this non-level standard signal canceling device, a signal in which the non-level standard signal or the level standard signal is not inserted and a signal in which the non-level standard signal is inserted are mixed and supplied. However, it is not desirable to insert a signal other than the level reference signal or the identification signal instead of the picture signal related to the non-level standard signal or the signal in which the level standard signal is not inserted because the picture information is lost. Therefore, in the present embodiment, the same operation as in the first embodiment is performed only when the identification signal is detected on a predetermined line.

5 is different from FIG. 4 in that an identification signal detecting means 5 and an AND circuit 6 are newly provided. Since other configurations are the same as those in FIG. 4, the same reference numerals are given. However, the description is omitted.

The input HD signal aa is supplied to the identification signal detecting means 5, the horizontal synchronizing signal is separated, and the period during which the identification signal is inserted is specified for each line based on this, and the identification signal is detected during that period. Whether or not it is present is discriminated, and if it is present, a high level identification detection signal 5a which is low level is obtained, and this is supplied to one input of the AND circuit 6.

Since the line detection signal 2a is supplied to the other input of the AND circuit 6, the output signal of the AND circuit 6 is at a predetermined line and is at the high level only when the identification signal is detected. Therefore, the timing generating means 3 generates the control signal 3a based on this output signal.

In this way, since the identification detection signal 5a as well as the line detection signal 2a is used, the input HD signal a
When the non-level standard signal and the level standard signal are not inserted in a, the selection means 4 does not replace the picture signal with the predetermined signal 1a, so that a high-quality output HD signal bb is obtained. be able to.

(Third Embodiment) In the first and second embodiments, the input HD signal aa is replaced by the predetermined signal 1a by the selecting means 4, but according to the second method described above, the identification signal is Since the signal other than the identification signal may be replaced with another signal, in the third embodiment, the input HD signal aa is simply muted at least during the period T2 in which the identification signal should be inserted.

As will be described with reference to FIG. 6, the same components as those in FIGS. 4 and 5 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 6A corresponding to the first embodiment, the input HD signal aa is supplied to the other end of the capacitor C, one end of which is connected to the switch circuit 7 via the resistor R. Then, the switch circuit 7 is controlled by the control signal 3a, is in the connection state at least during the period T2 in which the identification signal should be inserted, and one end of the capacitor C is grounded.

Therefore, since the input HD signal aa is muted at least during the period T2 in which the identification signal should be inserted, the output HD signal bb from which the non-level standard signal is released can be obtained with a simple structure. The same applies to FIG. 6B corresponding to the second embodiment. Moreover, since the output impedance of the signal source of the input HD signal aa is usually 75 ohms, it goes without saying that the resistor R may be omitted.

In the third embodiment, the case where the input HD signal aa is muted has been described, but in the first and second embodiments, the signal generating means 1 simply generates the ground potential, and the selecting means 4 operates. Then, the input HD signal aa is replaced with the ground potential at least during the period T2 in which the identification signal should be inserted.

In the above embodiment, when handling the Y, PB and PR signals shown in FIG. 2, only the Y signal is replaced with the identification signal by a signal other than the identification signal by the second method. As a result, it is of course possible to substantially cancel the non-level standard signal for the PB and PR signals.

[0041]

As described above, according to the non-level standard signal canceling device of the present invention having the configuration of the present invention, the non-level reference signal relating to the predetermined line specified by the line specifying means is inserted. Since the high-definition video signal is replaced with the output signal of the signal generating means during the period including the period, at least the non-level reference signal in the non-level standard signal is replaced with the level reference signal, so that the high-definition video signal is prevented from being dubbed. As a result, if the recording medium is accidentally erased or lost, and if you want to make a copy beyond the purpose of preventing dubbing, you can easily create a copy. is there.

Further, according to the non-level standard signal adding device according to the second aspect of the present invention as described above, the period during which the identification signal related to the predetermined line specified by the line specifying means is inserted. The non-level standard according to claim 1, wherein at least the identification signal in the non-level standard signal is replaced with a signal other than the identification signal in order to replace the high-definition video signal with the output signal of the signal generating means during the including period. An effect similar to that of the signal canceling device is achieved.

Further, according to the non-level standard signal canceling device of the present invention having the structure of the present invention as described above, only when the identification signal is detected in the predetermined line specified by the line specifying means, The high-definition video signal is replaced with the output signal of the signal generating means during a period including the period in which the non-level reference signal is inserted. Therefore, in addition to the effect of the non-level standard signal canceller according to claim 1, When a high-definition video signal in which no signal or level standard signal is inserted is supplied, there is an effect that the pattern signal is not replaced with the level reference signal and the pattern information is not lost.

Further, according to the non-level standard signal canceling device of the present invention having the structure of the present invention as described above, when the identification signal is detected on the predetermined line specified by the line specifying means, The high-definition video signal is replaced with the output signal of the signal generating means for a period including the period in which the identification signal is inserted. Therefore, in addition to the effect of the non-level standard signal canceling device according to claim 1, the pattern signal is used as the identification signal. There is an effect that the image information is not lost because it is not replaced with any other signal.

[Brief description of drawings]

FIG. 1 is a waveform diagram of a non-level standard signal.

FIG. 2 is a waveform diagram of another non-level standard signal.

FIG. 3 is a waveform diagram of an HD signal for explaining a line on which a non-level standard signal is inserted.

FIG. 4 is a block diagram of a non-level standard signal canceller according to the first exemplary embodiment of the present invention.

FIG. 5 is a block diagram of a non-level standard signal canceller according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a non-level standard signal canceller according to a third embodiment of the present invention.

[Explanation of symbols]

1 signal generating means 2 line specifying means 5 identification signal detecting means 1a predetermined signal (level reference signal, signal other than identification signal) aa input HD signal (high definition video signal) T2 period during which identification signal is inserted T3 non-level The period during which the reference signal is inserted

Claims (4)

[Claims] 1. A non-level reference signal that does not represent an amplitude level and the identification signal instead of a level standard signal that has a level reference signal that represents an amplitude level and an identification signal for identifying the level reference signal. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a non-level standard signal having the same into a predetermined line related to the effective scanning line, A line specifying means for specifying the predetermined line and a signal generating means for generating at least the level reference signal, and a period in which the non-level reference signal related to the predetermined line specified by the line specifying means is inserted. The non-level standard signal canceling device, characterized in that the high definition video signal is replaced with an output signal of the signal generating means during a period including. 2. A non-level reference signal that does not represent an amplitude level and the identification signal instead of the level standard signal that has a level reference signal that represents the amplitude level and an identification signal that identifies the level reference signal. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a non-level standard signal having the same into a predetermined line related to the effective scanning line, A line specifying means for specifying the predetermined line and a signal generating means for generating at least a signal other than the identification signal are provided, and the identification signal for the predetermined line specified by the line specifying means is inserted. A non-level standard signal canceling device, characterized in that the high-definition video signal is replaced with an output signal of the signal generating means for a period including a period. 3. A non-level reference signal that does not represent an amplitude level and the identification signal in place of the level standard signal that has a level reference signal that represents the amplitude level and an identification signal that identifies the level reference signal. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a non-level standard signal having the same into a predetermined line related to the effective scanning line, The line specifying means for specifying the predetermined line, the signal generating means for generating at least the level reference signal, and the identification signal detecting means for detecting the identification signal are provided. Replacing the high-definition video signal with the output signal of the signal generating means for a period including the period in which the non-level reference signal is inserted only when the identification signal is detected on the line. Non-level standard signal canceling device characterized by. 4. A non-level reference signal that does not represent an amplitude level and the identification signal in place of the level standard signal that has a level reference signal that represents the amplitude level and an identification signal that identifies the level reference signal. A non-level standard signal canceller capable of supplying a high-definition video signal by inserting a non-level standard signal having the same into a predetermined line related to the effective scanning line, The line identification means for identifying the predetermined line, the signal generation means for generating at least a signal other than the identification signal, and the identification signal detection means for detecting the identification signal are provided. Only when the identification signal is detected on a predetermined line, the high definition video signal is replaced with the output signal of the signal generating means for a period including a period in which the identification signal is inserted. Non-level standard signal canceling device.