TH3722A - Methods and devices for altering the video signal in order to prohibit the recording of the videotape it is acceptable. - Google Patents

Abstract

The modified video signal is so that the TV will still produce a normal color image from the modified video signal while the videotape recording of the modified video signal provides the picture. The picture is generally not acceptable. This invention relies on It is true that the automatic gain control system of the recorder Video tapes cannot be distinguished between normal shin pulses (including echlorination or mercury pulses) of normal video signals and synpulse. Artificial added The sinpulse here is defined as a pulse which It is down to the normal sintip level. And with an interval of at least 0.5 microseconds, the amount of artificial synpulse was added Entering a normal video signal between the vertical gap, and each pseudo-pulse is followed by a positive pulses with an appropriate amplitude and duration. Which is why Automatic gain control in a video recorder The tape will measure the video in error. Which is why the recording The video signal is not correct. The result is picture quality during playback. Not accepted For a similar reason this The positive pulse that occurs when not used It is normally used for reproducing the black level in a conventional television set and because it does not increase to cause The black level slump in conventional television sets is

Claims (9)

1. A method for changing the video signal to prohibit the recording of the video from there while rendering the image in normal color. Receive a television where the video signal is at empty, including synpulse. The number of synpulse harness and a given number of positive pulse pairs. To follow the said video signal The aforementioned synpulse and Within that empty range, where the added pulsed pair enables the automatic gain control in the VCR Performing erroneous determination of the video signal level and the dry result. The correct rate expansion is a videotape that Not accepted 2. Method according to claim 1, where the amplitude of Such a pseudo-synpulse is balanced against the pseudo-pulse of the signal. The said video And such artificial synthesis has each phase At least 0.5 microseconds 3. Method according to claim 1, where the positive pulse is added as Mentioned to the aforementioned video signal while in the range The receiver is not used for generating signals. Black levels and hence do not cause a loud depression at black levels In the changed video receiver 4. Method according to claim 1, where the said period is The vertical empty range of the said video signal. 5. Method of claim 4 where the synthesis of such a synthetic pulse There is at least one microsecond each time interval and at least 25 in the number for each such empty period, and Consecutive Synpulse Implant There is a interval of at least 6 μs, and such positive pulses have at least 3 μs each and at least equal amplitudes. The maximum white level of the said video signal 6. Method according to claim 4, where such positive pulse pairs Adjacent to each other within the vertical channel period 7. Method according to claim 4 where such pulses act Distributed indiscriminately throughout the aforementioned vertical range 8. Method according to claim 4 where such pulse pair act Distributed throughout the aforementioned vertical spaces in a non-adjacent, non-scattered form. 9. Methods according to the claim 5, where the wave amplitude is loud The said positive pulse is added to the fixed click level. Of transmission for transmitting changed video signal level 1 0. Method for claim 1, where the said empty period is Inserted at least 63.5 microseconds to interrupt playback. By such a receiver of the aforementioned positive pulses because the circuit The retrace of that place is not enough 1 1. Method according to claim 1 after that consist of steps Of adding pulses that become positive, not immediately paired After the percentage of the aforementioned synpulse has been selected, that percentage selection is placed in a random random number. At random or random as predetermined 1 2. Method according to claim 1 after that consist of steps Of the reduction in the amplitudes of the said synpulse of the said video signal 1 3. Method according to claim 11 per dish consists of steps When increasing the amplitude of the black level reference signal of The video signal, in order to correct the performance decline. Of the black level on the receiver caused by a video signal that Changed 1 4. A machine for changing the normal video signal to have The gap, which includes a synpulse, so that it can give a color picture. Normally on the TV set, but do not record video tapes. Admittedly, there were Signal entry path For receiving such ordinary video signals Modified way The video signal responds to the said input path. For the addition of a defined synthesized pulse and positive pulse pairs. One number into Go to the said normal video signal, followed by a loud pulse Said and to be within the said space and for action Emits the signal like a modified video signal and Emission pathway responds to said modulation pathway for transmitting signal to television receivers. And a videotape recorder with a modified video signal. The converted video signal is where the television receiver produces an acceptable picture quality from the aforementioned modified video signal, but the automatic gain control of the modified video recorder. Wrong video signal level because of modified video signal. As a result of the recording. Video tapes of modified video signals are not acceptable. 5. The device according to the claim 14 where the way of modification is as follows Including how the frequency generator responds to the signal A normal video for emitting a pulsed signal on Such a synpulse. Artificial Synpulse Pathway Responds to Pathways Such a frequency generator for artificial synthesis of the synthesized pulses. Such as the above ordinary video signal and the path The positive pulses respond to the aforementioned synthesized pulses for adding such positive pulses to the conventional video signal 1. 6. Apparatus according to claim 15, where the route generates frequency Such include The Sincerely Parent path for release only The synpulse signal of the normal video signal, the first monostable path, responds to the loud synaptic pathway. Say for the emission of a pulse current that responds to Such a signal. Counting path for counting loud pulsed currents Said, and the delay is a signal there, and 1 7. The machine according to the claim 15 where the sinpulse path is loud These include monostable, multivibrator and transistor response. Responding to that for the production and addition of synpulse implants. Let's go into the normal video signal and the way for Changes in the timing of the aforementioned synthesized synthesized and the said synthesis pathway And the artificial synthesized pathway These include a monostable multivibrator for the production and the addition of such positive pulses to such conventional video signals. And the intersection for changing time and interval Wave width of such positive pulses, respectively 1. 8. The machine according to the claim 14 next, then consists of the path Formal Vertically for making gaps As mentioned at the time and for limiting the aforementioned increase of Pulsed pairs, as defined above, enter the existing section of The gap along the line above 1 9. The device according to the claim 14 where the modified path The video signal adds such a pair of pulses only at a certain time. During that busy period only Which are not used by the receiver Such a vision for generating black level signals where interlacing Block the modified video signal from the cause of the depression. Of the black signal level in the picture produced by the television set 2 0. The machine according to the claim 16 where the way the machine Producing such pulses, including providing a trom program for answering Responding to the aforementioned trajectory, the signal output one random, random, and bambam pattern that was defined depending on the making of the ROM (20 claims, 5 pages, 4 photos).