Method and apparatus to synthesize and defeat video copy protection signals.

Institute

Mexican Property

Industrial title _{ΟΕΕΆΤΕΜΤΕΜΛ} 2391S7

Headlines):

MACROVISION CORPORATION

Address (s): 1341 Orleans Drive, Sunnyvale, California, 94089, USA

Name: METHOD AND APPARATUS TO SYNTHESIZE AND CANCEL THE PROTECTION SIGNALS OF THE VIDEO COPIES.

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THIS PATENT (fpNCEt = TO ITS OWNER OF THE INVENTION CALLED OR IN CHAPTER rE

MKWMIK

OPERATION HAS A VALIDITY

FROM ΠΡ SA FFCHA DF

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THE DIRECTOR &lt;

chem;

Issue Date: August 2, 2006

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NTES

SALAZAR GARCÍA

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METHOD AND APPARATUS TO SYNTHESIZE AND CANCEL THE SIGNAL PROTECTION OF THE VIDEO COPIES

Institute • Mexican (felá Property

Field of the invention.

In the field of the present invention are the mechanisms and / or methods to cancel, eliminate, or reduce the effects of the protection signals of the video copies. These mechanisms are also used to synthesize and improve the operation of a protection signal from a video copy.

Background of the invention.

The Hollywood film industry is very concerned about the unauthorized copying of movies and shows. For example, on September 17, 1997, Jack Valenti, President and CEO of Motíon Picture Association of America, stated: If you can't protect what you have - you own nothing. The patent of

Ryan, 4,631,603, describes a way to process a regular video program source for copy protection. Video from the protected copy can be viewed on a television but produces a recording failure of any entertainment value. That is, video programs that are not taxable suffer from artifacts ranging from low contrast to

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afc-. · - Instituto Sema Mexicano

You. Patent '603 describes a method to cause the lack of operation of the if synchronization to confuse or (Felá Property

AGC on a VCR recorder while (ndustlMI causes black depression problems on a receiving television that displays the copy with protected signal.

A Polish Patent Application (PL 304477 {'477)) from Tomasz Urbaniec entitled Method and Apparatus for

Protection of Video Recordings Against Copying

Authorized filed July 28, 1994, describes a variation of Ryan's' 603 patent. The figure of the '603 patent describes the waveform of the signal protected from the video copy as described

Ryan, and is duplicated in this application as

Figure the. Figure 4 of the Urbanice '477 patent describes the comparative waveforms as described by Urbaniec, which is repeated in the present application, as in Figure 1 (b).

As is well known in the art, the videocassette system has a limited luminance frequency response, less than 2 MHz. A signal recorded on a videocassette tape recorder as described by Ryan, with the AGC turned off (to avoid copy protection effects) will produce a pulse-shaped video signal modified by the recorder's limited frequency response

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Λ^νΛ duplicator. Since there is no interval. between flS £, ·· Instituto úfed-de Mexicano impulses of pseudo synchronization and impulses A ((faith Property

Ryan, the AGC system of a duplicator recorder (domestic ntíostlMI will respond to the combination of pseudo sync pulses and AGC pulses.

The limited bandwidth of VCR recording responds slightly differently to the combination of pseudo-sync and AGC pulses separated by a 0.5-month time interval by two a. 2.0 microseconds. If the time interval is as low as 0.5 microseconds, the limited bandwidth of the videocassette recorder you are recording distorts the time interval to effectively remove it, and the effectiveness of copy protection is essentially the same as that of accomplished by Ryan. According to. interval is extended, the effectiveness of copy protection is reduced or removed.

To override the copy protection process, there are a number of known means such as attenuation, erase level incorporation, narrowing, level change, modification and / or clamping of copy protection pulses such as described in patents 4,695,901 ('901),

4,335,554 {'554), 5,157,510 ('510), 5,194,965 ('965),

5,583,936 ('936), 5,633,927 (*927), 5,748,733

5,661,801 ('801) cited above.

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Mexican Institute (felá Property

In the patents mentioned above, the (ndustrtdf AGC and / or synchronization or pseudo-synchronization pulses (see patent 4,695,901) are changed in their amplitude, changed in level relative to the normal synchronization pulses, and / or changed in width of the pulse, to enable successful recording.

In particular, Patents 5,194,965 and 5,157,510 describe narrowing of the AGC and / or pseudo-synchronization pulses so that the recording VCR does not perceive these narrowed aggregate pulses and therefore makes a successful copy.

Summary of the Invention.

To override the signal against copying, the present invention describes a method and apparatus that utilizes a pulse position and AGC pulse width modulation and / or sync or pseudo sync pulses. The present invention also describes the introduction of a sufficiently wide time interval between the AGC and / or pseudo sync pulses so that the recording VCR will respond to or perceive the sync or pseudo sync pulses but still allow a taxable d.

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The protection override mechanisms of the fngustflart copies of the present invention can also be used in combination with any above mentioned override inventions. For example, to override the copy protection process, you can change (delay) the AGC pulse by about 1.5 microseconds away from the preceding pseudo sync pulse, and then trim the trailing edge of the preceding pseudo sync pulse by 0.6 mi croseconds. Thus there is an interval of approximately 2.1 mi croseconds between the trailing edge of the trimmed pseudo sync pulse, and the leading end of the delayed AGC pulse. If this range is, for example, close to the erase level output level by 2.1 microseconds, then the VCR will sample the voltage in the range rather than the AGC pulses added by its AGC amplifier. By sampling this range voltage close to the erase level, the copy protection signal is bypassed. Alternatively, the range voltage level can be set above or below the erase level creation level. It is important to note that simply

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delaying or impulse changing the position of the edge, delaiw l¿fc ··· Institute

AGC relative to trailing edge ^ MexiCQno Ha In Pmni (winH pseudo sync pulse, the interval between the pseudo sync pulses and AGC pulses will nullify or partially nullify the effects of the AGC copy protection signal. It is also possible to create this interval in other ways such as by moving the rear end of the pseudo sync pulse away from the front end of the incoming AGC pulse, and some combination of movement of the position of both the AGC pulse and the pseudo sync pulse. to form an interval that would override the copy protection process. Typical durations of the interval of 1.5 microseconds or more have proven effective in overriding the copy protection signal. The composition of the narrowing of the pseudo sync pulses and / or AGC pulses with this interval further improves the override of the copy protection signal.

It should be noted that the override method as described above can be .varied and then used as a copy protection token.

Dynamically varying the interval from zero to an interval greater than 1.5 microseconds between the rear end of the pseudo sync pulse relative to the front end made a new signal to

Incoming AGC!

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Instituto wa Mexicano (felá Property of the copy protection impulse to effectively imitate Ryan's patent '603 with Industrio? AGC impulses of amplitude modulation. Varying the interval by modulating the position of the pseudo sync pulses relative to the AGC pulses or vice versa, or dynamically narrowing or changing the pulse width of the aggregate pulses (AGC pulse and / or sync pulse or pseudo sync pulse) , an easier copy protection implementation is possible in the digital field and / or in the analog field.

Today's digital field is the format of choice for implementing copy protection on cable systems and the like (eg versatile digital disc players). The range of the pulse widths can be, for example, from about 50% to 100% of the normal pulse widths (for example, the widths of the normal pseudo-sync pulses are about 2.3 microseconds, and the normal AGC widths are from about 2.3 microseconds to 3 microseconds depending on how many added pulses are on the television (TV) line).

In general, the copy protection system of the present invention can start with impulses

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aggregate pairs such as in Ryan '603 patent, where Figure 2 (a) di

Instituto impulse agc and / &lt;r ^ éiMexicano (fetus Property impulse of pseudo synchronization are placed (ncSustrtdf separated with respect to time. If the interval due to position separation is insufficient to shut down the copy protection process (for example position modulation amounts to only 1.0 microseconds interval), then the AGC pulse and / or the pseudo-sync pulse may be narrowed as a function of time to sufficiently increase the interval (for example, Slightly trim or narrow the AGC pulse and / or pseudo-sync pulse by approximately 0.35 microseconds each, which would add another 0.7 microseconds to the 1.0 microseconds interval for the increased duration of the 1.7 microseconds interval.)

After the interval has been extended to override or turn off the copy protection signal, a new copy protection signal is then reactivated by reducing the gap (for example, to zero) between the AGC pulse and the print pulse. pseudo timing and restoring the pulse widths of the AGC and / or pseudo timing pulses (clipped or narrowed) to their full normal pulse widths.

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pos modulation

Synchronization Institute and AGC Tara Mexicano (felá Property protection signal of the (ndUStlMI protection impulses of a horizontal interval of

The method of using relative between the annular pulses and / or synthesizing a copy, can be applied to the copy at and around the erase level. The method can also be combined with narrowing of any portion of the aggregate impulses.

In order to produce an additional effective copy protection signal, a variation of patent 4,631,603 has been developed. To this end, the AGC pulses are also amplitude modulated from full amplitude to zero and vice versa for a period of time of eg about 2 0 to 3 0 seconds. As a result, the illegal copy will have constantly changing brightness levels. This' causes more discomfort when compared to a constant darkening of the film (when AGC pulses are static and full amplitude).

Brief Description of the Drawings.

Figure la illustrates the basic anticopy process consisting of AGC pulses and pseudo synchronization;

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Figure Ib, illustrates the basic anticopy process that of pseudo synchronization;

Modification consists of ürbani tied ··· Impulse Institute · and Mexican (felá Industrial Property

Figure 2 illustrates various modes for repositioning the AGC pulses to override the copy protection signal. Figure 2 also illustrates a way to dynamically change the position of the pulse.

AGC to produce the copy protection process of the present invention;

Figure 3 illustrates a combination of repositioning and narrowing (clipping) of the AGC pulses to override the copy protection signal. The

Figure 3 also illustrates a means for dynamically changing the position and then narrowing the AGC pulses in accordance with the copy protection process of the present invention;

Figure 4 illustrates various ways to change the relative position between AGC pulses and pseudo sync pulses while narrowing the pseudo sync and / or AGC pulses to override the copy protection signal. And the shifting and narrowing of the AGC pulses and / or pseudo sync pulses is made from zero to maximum, then this technique can be used as the copy protection signal of the present invention;

Figure 5 »illustrates an apparatus for overriding a signal by delaying AGC pulses;

Figures from the 5th to the wave generated at various points

5;

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Instituto lopi a Mexicano (felá Industrial property

5s illustrate the forms of the circuit of Figure protection block diagram of the

Figure 6 illustrates an apparatus for overriding a copy protection process by inserting a time interval between the pseudo sync pulses and the AGC pulses;

Figures 6 to 6E illustrate various waveforms related to or generated by the

Figure 6, due to typical copy protection signals as an input;

Figure 7 illustrates a copy protection apparatus of the present invention that generates a dynamically variable time interval (around the erase level level) between the trailing edge of the pseudo sync pulses and the leading edge of the pulses AGC;

Figures 7a to 7e illustrate the relevant waveforms that are generated at various points in the circuit of Figure 7;

Figures 8a and 8b illustrate the delay of the position or modulation of the posterior portals.

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high as mentioned in the patent which can be used as an annulment process '' orMEXICÓTK, &lt;feta Property as a copy protection signal. By varying the (ndUStrtoA interval between the rear end of normal timing pulses (horizontal) and its raised rear portal of AGC pulses, the VCR will respond to these as if the AGC pulses of the raised rear portal were being modulated in their upward amplitude and downward, resulting in yet another dynamic copy protection process of the present invention;

Figure 9a illustrates a copy protection sign of the prior art. Figure 9b illustrates a method of override and modification by reversing at least portions of the pseudo-sync and / or AGC pulses. Figure 9c illustrates another method of overriding or modifying the original process (Figure 9a for example) by phase change (eg reversing) portions of the pseudo-sync and / or AGC pulses;

Figure 10 is a block diagram illustrating a circuit for reversing at least some portions of the pseudo sync and / or AGC pulses by means of a memory circuit; and

Figure 11 is a block diagram illustrating a circuit for inverting or changing the phase of portions

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of the pseudo synchronization and / or AGC flafc pulses, ·· Middle institute of a Mexican inversion or change amplifier (felá Property together with an interruption or dissolution amplifier, fnj ^ strtoíl An optional level change circuit and / or dimmer is also illustrated in Figure 11.

Detailed Description of the Invention.

As explained above, Figures la and Ib illustrate copy protection and prior art copy protection override signals, respectively.

Figure 2 illustrates various waveforms corresponding to the ways in which AGC pulses can be delayed to provide a copy protection override technique of the present invention. First, waveform D in Figure 2 illustrates an AGC pulse and a pseudo-sync pulse in the normal position shown above in Figure which causes copy protection. Waveforms A through C show various delays or intervals between the rear end of the pseudo sync pulse and the front end of the respective AGC pulse. Waveforms

A and B are effective in turning off the copy protection signal while waveforms C causes a

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Λ? Λ partial reduction or shutdown of the copy protection signal. To effectively override the signal (or the Copy Protection Property, it is preferable to use the forms (ndUStlMI of wave A and B.

For a new copy protection signal that is dynamically varied from on to off, a technique of the present invention starts for example with several seconds of waveform D of Figure 2 (copy protection on) it is then transferred to waveform C of Figure 2 (copy protection partially turned on) and then transferred to waveform B of Figure 2 (copy protection off).

The interval, or T4 gap, of Figure 2 is preferably continuous or changing separately from zero at intervals greater than 1.5 microseconds. Waveform A is used to turn off copy protection.

In Figure 2, (as well as Figures 3, 4) the time interval Ti defines the period of the normal sync pulse for the first pseudo sync pulse, T2 defines the repetition rate of the aggregate pseudo sync pulses, T3 defines the width of the pseudo sync pulses and T4 defines the duration of the interval. T6 designates the width of

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which can

Instituto ™ · '· Mexican _n . (fela Property of the modality

AGC, though the one erase reference boost the included as an option.

Figure 3 illustrates a variation of Figure 2 throttling impulse pseudo sync pulses can be narrowed as well. In waveform H of Figure 3, the pulse resembles a narrowed AGC pulse, mentioned earlier in the '510 and' 965 patents. Although the H waveform in Figure 3 can be used to override the copy protection signals, it can also be used again as part of a copy protection signal. Waveform D in Figure 2 represents a normal copy protection signal which can be translated into waveform H in Figure 3, a signal with a narrow AGC pulse, and then translated into the F wave in Figure 3, a signal with a narrow AGC pulse and interval.

Finally, the copy protection signal can be turned off by transferring it to the G waveform of the

Figure 3, where the interval is larger with. the narrowed AGC momentum. Waveform E in Figure 3 is equivalent to Waveform A in Figure 2 and is used to override copy protection.

Figure 4 illustrates the narrowing of a pseudo-synchronization pulse combined with the delay o

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Modulation of the position of the widths ¿fe-, · - Institute variables of the AGC impulses to cancel the processW ^ of MexiCQno,,, (tetaProperty copy protection, or form a dynamic signal of JngJystrtflí, copy protection.

Waveform D 'in Figure 4 illustrates an override process not illustrated by Quan and associates in the' 510 and '965 patents mentioned above. In waveform D 'of Figure 4, the trailing end of the pseudo sync pulses is advanced to produce a narrowed pseudo sync followed by a leading end of the delayed AGC pulse to produce a narrowed AGC pulse. Waveform C 'in Figure 4 illustrates a further increase in the interval in duration between the AGC pulse. delaying the position of the AGC pulse using the leading rear end to tighten the pseudo timing pulse. Waveform B 'in Figure 4 illustrates a combination of position separation

<td colspan="2">between the momentum</td><td>AGC</td><td>and the</td><td>impulse</td><td>of</td><td>pseudo</td>

<td>synchronization</td><td>with</td><td>the</td><td>impulse</td><td>AGC and</td><td>the</td><td>pseudo</td>

<td>synchronizations</td><td colspan="3">narrowed. Of</td><td>this way,</td><td>the</td><td>form of</td>

B 'wave can be used as a method to cancel copy protection pulses. As can be seen, waveform A 'is generally the equivalent of waveforms A and E in Figures 2

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.¿Λ and 3, respectively, nullify the effects of and may be the copy protection signals. fntiastiW!

Alternatively, using the narrowed pseudo-sync and / or AGC pulses having a varied width, Figure 4 provides a dynamic copy protection signal of the present invention based on the dynamic change of interval (gap) and amount of narrowing in the pseudo synchronization and / or AGC pulses. For example, the modality may start with a D waveform as illustrated in Figure 2 to provide the copy protection process, and then provide narrowing of the AGC pulses and / or the pseudo sync pulses for achieve partial copy protection by waveform C 'in Figure 4, and then translate to a signal such as waveform B' in Figure 4 to turn off copy protection. The mode then reverses the cycle of waveforms B 'to C' and returns to D to restore copy protection.

Figure 5 is a block diagram illustrating an example of a circuit system for overriding copy protection pulses by delaying AGC pulses relative to pseudo sync pulses. For this purpose, a copy of the protected video in (a) is inserted into a delay circuit 50, which delays the introduction of the

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(Felá Property is also the separating synchronizer circuit 52. The output synchronization separator circuit fndUStdoA provides horizontal and vertical synchronization pulses to a timing circuit 54 which in turn produces pulses (d) that match the video lines they contain AGC impulses from the elevated posterior portal and those with AGC impulses. This output signal, in AGCLL, is logic high at least from the front end of the AGC pulses of the video signal input to the rear end of the pulses

AGCs, which appear at an output (b) of delay line circuit 50 (delaying video input by approximately 1.5 microseconds or more). A black clamp circuit 56 connected to delay line 50 releases most or all of the timing pulses. Thus, the delayed AGC pulses are supplied to the output (c) of the black clamp circuit. Through the use of an electronic switch

58, with the AGCLL control signal to change the delayed AGC pulses, the effects of the copy protection pulses are then nullified or reduced at the output (e) of an amplifier 60.

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Figures from 5a to 5e illustrate the waveforms generated in. Different locations of Figure 'sMexICOflO (Seta Property and generally self-explanatory. For example, tncKistifflrt in Figure 5e, the output has an interval that is, the separation 62 corresponding to the interval T4 of the

Figures 2-4, long enough between sync pulses and AGC pulses to allow taxable copies of the video signal. It should be noted that Figure 5 is only an illustration of an apparatus for producing the position delays of the AGC pulses to override the video protection signal. It is also possible to design a position delay equivalently by substantially removing the protection signal from the original copy or parts of it and then regenerating the modified pseudo sync and / or AGC pulses. For example, incoming copy protection pulses can be removed and then pseudo-sync pulses inserted before the original pseudo-sync pulse, with AGC pulses inserted in delayed relation to the original AGC pulses. In this way, the interval voltage is produced between the pseudo sync pulses and the AGC pulses that allow for a gravel copy.

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Figure 6 is a block diagram that i

Institute circuit system to create the Mexican spin interval (felá Property around the erase level output level, (ncSustlMI trimming (forward) the sync back end and delaying the forward end of the AGC pulse of the protection signal of the copy, which leads to a taxable copy. This cut is a different form of the narrowing not illustrated in the

North American Patent Number 5,194,965. The copy-protected video is fed to (a) the sync separator 64 at the composite sync output that includes pseudo sync pulses at one knock 66 (multiple vibrator).

A knock 66 deactivates the trailing end of the sync pulses including the pseudo sync pulses and the width of their pulse can be controlled by the control voltage VC66.

The output (b) of a knock 66 is connected to another knock 68 whose pulse width is controlled by another control voltage, VC68. The output (b) of a detonation 68 then coincides with the pulse of the last portion of the sync or pseudo sync pulse and at the beginning portion of the AGC pulse of the input signal of the protected video copy. one sync splitter output

-Mil-Mi, «# · ji is also fed to the temporarizacióST circuit. ..

Institute which generates pulsations and impulses coinciding with '' laMexiCOAO (felá Property copy protection signal within the video fncklStlMI lines. The output of timing circuit 70 and detonation one 68 are fed for an AMD detonation signal 72 to control a switch 74 during times when copy protection pulses are present. Switch 74 receives the copy protected video at (a) and outputs a signal containing an interval voltage between the sync and AGC pulses of the copy protection signals, wherein the video signal at an output (e ) of an output amplifier 76 allows a taxable copy.

Figure 6 also uses a 7 8 color bandpass filter to generate the interval, but also to reinsert the color burst during narrowing of the elevated posterior portal and / or normal synchronization. In fact, the narrowing and / or attenuation and / or level change of any type of the AGC impulses of the elevated posterior portal and / or its synchronization signal can result in a taxable copy (see AGC signal of the elevated posterior portal as in Figure 3 from US Patent No. 4,819,098 to Ryan).

Figures 6a to 5e illustrate the result of this type of narrowing. Figure 6a represents

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a typical copy protection signal that consists of · Institute of pseudo synchronization pulses and AGC pulses. ΐ / a Mexicana (faith the Property

Figure 6b illustrates pseudo sync pulses (ndustlMI and / or narrowed AGC pulses with an interval (voltage) between them. Figure 6c illustrates a horizontal pulse with a raised tailgate AGC pulse in a typical mode of a protection signal of the copy.

Figures 6d and 6e illustrate the result of the apparatus of Figure 6 which narrows the AGC pulse of the raised tailgate (Figure 6d) and / or the horizontal sync pulse (Figure 6e) to allow for taxable copying. Note that in Figure 6e the burst of color is still present even after narrowing, in the area where the. Burst locates normally.

Figure 7 is a schematic block diagram illustrating a circuitry for the overall copy protection process of the present invention which mimics amplitude modulation of AGC pulses by modulating the. position. The program video with or without copy protection is the video input signal supplied at input (a) to sync separator 80, which in turn produces horizontal range pulses. The horizontal range pulses are, connected to a closed oscillator

-Mil-Mi

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horizontal fl (detonated) 82. The output of this osci flS £, ·· Institute preferably, but not necessarily closed parct da-MexicanO &lt;feta Property horizontal frequency at a higher frequency (for (ndUStiMI example 4 cycles per half line of videos The detonation timing circuit 84 (multiple vibrator) defines the duration of the positive pulse of the closed horizontal oscillator 82. Whereas, the sync separator 80 also produces the horizontal range pulses at knock one 86 whose output is connected to a knock 88. The above provides a trigger signaling pulse for locating the pseudo sync pulses on the line video (for example, 32 microseconds or the first half of the video line). The location of the respective video lines that will contain the copy protection pulses is generated by a circuit consisting of a knock 90, a line counter (525) and an EEROM circuit 94. From the synchronization separator 80, they supply horizontal pulses to detonator 90 whose output coincides with the start of the video line. The frame reset pulse is fed to the line counter 525 92 (for example for WTSC) along with the horizontal range pulses for the counter clock. The counter output is used to drive the memory circuit of EEROM 94, the

<img file="MX239157B_D0028.tif" />

which is programmed to produce high logic impulses

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Institute that coincide with those video lines that have.MexiCOnO impulses for copy protection. The output (b) of an AND 96 signal tnckistltart then comprises inverted pseudo sync pulses on the selected video lines (eg, vertical blanking level range).

One method of generating position modulated AGC pulses is to induce pulse width modulation into an inverted pseudo-sync pulse signal, and then disable the trailing edge of this pulse width of the modulated inverted pseudo-sync pulse signal to generate pulses.

AGC. To this end, the output of the AND signal 96 detonates a controlled voltage in a knock timer 98 at the leading edge of an inverted pseudo-sync pulse signal. The output (c) of a knock timer 98 is a pulse with a minimum width of the AND signal output 96, and a maximum pulse width of 1.5 microseconds (or more) than its minimum pulse width. For example, if the AND signal output 96 has a pulse width of 2.3 microseconds, then the knock timer output 98 has pulse widths that vary according to the VC1 voltage control from 2.3 microseconds to at least '

<img file="MX239157B_D0029.tif" />

minus 2.3 microseconds + 1.5 microseconds or gg joint, ·· Institute minus 3.8 microseconds. The output of the timer ¿Le ^ ®XÍCGnO (felá Property detonation 98 is OR'd by an OR 100 signal with a fndUStlMI output of AND 96 signal to ensure the output (d) of the OR 100 signal that has a minimum pulse width inverted pseudo synchronization from the AND signal.

The OR 100 signal output detonates at the trailing edge to the AGC pulse output whose widths can be controlled by voltage via the VC2 voltage control supplied to a knock timer.

102 voltage controlled. The knock timer 102 output then provides the AGC pulses that are varying in delay from the trailing edge of the^: Pseudo synchronization pulses in the order of zero to at least 1.5 microseconds. The output of the knock timer 102 (AGC pulses) is fed to a summing amplifier 104 along with the video input signal. The output of the inverted pseudo-sync pulse from the signal

AND 9 6 is negatively summed with the output of the amplifier 104 by means of a summing (negative) amplifier 106. The output (e) of the amplifier 106 then has AGC pulses modulated in position relative to the pseudo-synchronization pulses and thus a Dynamic copy protection signal.

<img file="MX239157B_D0030.tif" />

Note that Figure 7 illustrates that the Institute

AGC can also be modulated in its width of ipuIgo ^ if knock timer 84 is controlled by ItKkíStlWI voltage. Figures 7a to 7e illustrate the waveforms generated at different locations (a) - (e) in the circuit of Figure 7.

Figures 8a, 8b illustrate that the circuit of the

Figure 7 can be applied for copy protection pulses with normal timing and raised rear port AGC pulses as exemplified by Figure 7a. Therefore Figure 8b illustrates a dynamic protection signal, of the copies modulated by the position that modifies the technique of the

Figure 3 of Patent Number 4,819,098. The signal illustrated in Figure 8b can occur in groups, or on selected video lines.

It should be noted that the copy protection process of the present invention may have position width modulation, pulse width and / or interval width, and / or amplitude modulation made on the individual pseudo sync pulses, the pulses sync horizontals, AGC pulses or AGC pulses from the raised rear port, over time for maximum separation (copy protection overridden) to minimum separation (copy protection

<img file="MX239157B_D0031.tif" />

total). For example, if there are of the normal pulses of pseudo s mcromzaci pulses (fe Property AGC pulses, you can slightly increase any (ndustiMI combination of the separation between AGC pulses and pseudo synchronization pulses in any number of pairs of pulses at the moment or all at the same time until enough even pulses of the copy protection pulse pairs have a maximum separation to turn off the copy protection. Additionally, you can slowly decrease the gap from the 'maximum gap (override copy protection) to the minimum gap (full copy protection) in any combination.

As a further example, copy protection signals can be fully applied in or near the vertical blanking level production range, and copy protection signals can include different amounts of pulses added per video line . In one embodiment for example, a single pseudo sync pulse and / or AGC pulse can be modulated on a video line.

As mentioned above, AGC pulses or elevated rear port AGC pulses can also be amplitude modeled in combination with the aforementioned processes.

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<img file="MX239157B_D0033.tif" />

Figure 9a illustrates a waveform of a copy protection s from the prior art. One o'clock ^_{| nst¡tuto}

<img file="MX239157B_D0034.tif" />

Industry # illustrates a waveform of a signal override or modification method of Figure 9a which reverses the order of at least some portions of the pseudo sync and / or AGC pulses. Figure 9c is a waveform of another method to abort or modify the original process (Figure 9a for example) by means of phase change, for example by reversing at least portions of the pseudo-synchronization and / or AGC pulses. In the case of Figure 9c, the phase change is a 180 degree inversion of the pseudo-sync and AGC pulses. Note that the methods described for Figures 9b and 9c can be applied to those copy protection pulses around or within the horizontal range of erase level incorporation. The methods described for Figures 9b and 9c can of course be combined with processes of relative attenuation, impulse narrowing, level change, and / or cancellation of copy protection by means of position modulation.

It is also possible to use the techniques described in Figures 9b and 9c to synthesize a copy protection signal. To dynamically turn the copy protection process on and off, for example

<img file="MX239157B_D0035.tif" />

For example, the technique begins with a signal to protect the Mexican Institute of the copy as illustrated in the F r gur ^ | ^ PrttpioriwH (copy protection effectively turned on). The technique continues for example, slowly reversing the order of the pseudo syncs with the AGC pulses until the copy protection signal (modified) becomes substantially in Figure 9b (copy protection effectively turned off). Similarly, if the technique starts with Figure 9a where the copy protection is fully on, then the copy protection process is slowly turned off by reversing (changing the phase), attenuating, changing the level and / or modulating the position of the pseudo sync and / or AGC pulses until the copy protection signal (modified) becomes the signal illustrated in Figure 9c.

Referring to Figure 10, through the use of a video memory 110 and / or a regeneration signal, the waveform of Figure 9a can be transformed to that of Figure 9b. In this mode, video memory 110 stores, for example, the signal from the

Figure 9a where however, the signal is extracted by reading the memory in reverse order to achieve the signal of Figure 9b. Thus, the block diagram in Figure 10 is an example of the

<img file="MX239157B_D0036.tif" />

the implementation of the latest technical signal for all or the porcioiie ^ © XICano

Οθ The Property of the pseudo-synchronization impulses ffl was a circuit circuit system for inversion of selected and / or AGC.

The Figure provides the aforementioned phase change technique, which transforms the waveform of the

Figure 9a in that of Figure Se. For this purpose, a reversing (or phase change) amplifier 112 inverts the signal (changes phase) of Figure 9a. A video solvent mix amplifier 114 (or switch) is used to transform or translate the waveform of Figure 9a to that of Figure 9c. the solvent amplifier 114 is responsible for a control voltage 118. Accordingly, FIG. 11 illustrates a circuit system for reversing or phase shifting of at least some portions of the pseudo sync and / or AGC pulses by means of the reversing or phase shifting amplifier 112 together with the amplifier. switching or dissolving 114. An optional level change and / or attenuator circuit 116 is also illustrated in Figure 11 in translucent lines. The level change / attenuator circuit

116 It is responsible for the level change control signal 120.

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Although the present invention has been described __, ....

j ^ - · Institute in relation to the preferred modalities, will be added ^ ® ^^dog® &lt;2 @ the Property appreciate various additional features and advantages of the description and drawings, and therefore the scope of the present invention is defined by the following Claims and their equivalents.

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