Abstract: A output device generates a PN code string every second chip interval with reference to the video sync signal, and spectrally spreads additional information using this PN code string. The spectrally spread additional information is superimposed on the video signal every second chip interval and output. Upon receiving the video signal, in the recording device for recording the video signal on a recording medium, the video signal components cancel each other between the video signal component in the chip interval on which the additional information is superimposed and the video signal component in the chip interval on which the additional information is not superimposed because of the correlation of the video signal in the horizontal direction, and only the additional information is extracted.

Abstract: The output device generates the PN code string every second chip interval with reference to the video sync signal, and spectrally spreads the additional information using this PN code string. The spectrally spread additional information is superimposed on the video signal every second chip interval and outputted. Upon receiving the video signal, in the recording device for recording the video signal on a recording medium, the video signal component is canceled each other between the video signal component in the chip interval on which the additional information is superimposed and the video signal component in the chip interval on which the additional information is not superimposed because of the correlation of the video signal in the horizontal direction, and only the additional information is extracted.

Abstract: On the occasion of superimposing a spectrum spread additional information signal obtained by spectrum spreading the additional information such as a duplication preventing control information and a copy right information, etc. to a video signal, the edge portion of an image of the video signal is detected to set the level of a part of the spectrum spread additional information signal higher than the other part in the part corresponding to the edge portion for the purpose of superimposing such additional signal to the video signal. Thereby, the additional information signal can easily be detected, without deteriorating the reproduced image.

Abstract: Disclosed herein are an additional information superposition method and a video signal outputting apparatus, wherein the additional information superposition method for superposing additional information spectrum spread with spread codes synchronized with a vertical synchronizing signal on a second video signal for forming an image of an aspect ratio of N:n which is to be converted into and outputted as a first video signal for forming an image of another aspect ratio of M:m, comprising the steps of setting a size of a unit block before conversion in the second video signal based on a size of a unit block after conversion to which one chip of spread codes for despreading determined in advance is allocated and contents of a conversion process into the first video signal, and superposing the additional information spectrum spread with the spread codes of one chip allocated for each unit block before conversion having the set size in such a manner as to allow the additional information to be extracted from the f

Abstract: A method and apparatus for detecting spectrum spread signals by reducing the correlation between the main information signal and the spread signal as much as possible, whereby the detection of a spectrum spread signal is made easier. From an input signal, in which a spectrum spread signal obtained by spectrum spreading an additional information signal has been superimposed on a main information signal, the spectrum spread signal is detected. Using a level adjusting circuit, the gain of the input signal, mainly the main information signal is controlled to reduce the change in the main information signal, or the input signal is sliced at a predetermined level by a slicing circuit to fetch a signal at a predetermined level or lower.

Abstract: An additional information signal is superimposed on a video signal at a very low level so that it does not stand out on the reproduced image. Spectral spreading code sequences are generated corresponding to different predetermined parts of the video signal. Bit information signals of the additional information signal made up of plural bits are spectrally spread by the spreading codes to generate spectrally spread bit information signals corresponding to the plural bits. The spectrally spread bit information signals are superimposed on corresponding different predetermined parts of the video signal. Because high priority bit information signals of the spectrally spread additional information signal are superimposed on high priority parts of the video signal, high priority information in the additional information can be protected even if the video signal is modified.

Abstract: A method of superimposing additional information on a video signal, transmitting it, and detecting the additional information from the transmitted video signal. The additional information is synchronized with a sync signal in the video signal, and generated in N (N≧1) unit intervals of one field of the video signal. Some predetermined unit intervals of the additional information generated in N (N≧1) unit intervals of one field of the video signal, are phase-inverted. The additional information is identified by detecting the information in unit intervals based on the sync signal in the video signal, and detecting that information in some predetermined unit intervals is inverted. The additional information is identified by detecting the information in unit intervals, and integrating the detection results with the information in inverted predetermined unit intervals inverted.

Abstract: A superimposing position setting unit uses a video synchronizing signal from a synchronization separating unit as a reference signal, and generates a superimposing position indicating signal S4 for indicating an effective image plane interval of a video signal as a superimposing interval during which an SS duplication control signal is superimposed. An SS duplication control signal generator generates a PN code sequence repeating every one vertical interval, and spreads the spectrum of a duplication control signal S3 by using the PN code sequence to form an SS duplication control signal. The SS duplication control signal is outputted to the effective image plane interval on the basis of the superimposing position indicating signal S4, and is superimposed on the video signal during the effective image plane interval of the video signal by an adder.

Abstract: This invention provides an image transmission method, image anti-duplication method, image anti-duplication device, and image recording medium in which the information for anti-duplication control is superimposed on the video signal without deterioration of the resultant video signal and the information is extracted accurately and quickly to perform anti-duplication control.

Abstract: The invention provides an information duplication prevention method and an information duplication prevention device capable of performing correct and proper duplication prevention. Prior to transmission of the information signal such as video signal, an anti-duplication control signal for preventing duplication of the information signal is transmitted. The reception side for receiving the information signal can arrange the condition for performing duplication prevention control based on the previously received anti-duplication control signal prior to reception of the information signal.

Abstract: A new additional information generating section generates new additional information FS1 based upon information from an additional information reading section. The spectrum of the new additional information FS1 is spread by an SS additional information generating section and supplied to a signal superimposing section as SS additional information SF1. The signal superimposing section generates a digital video signal S2 by superimposing the SS additional information SF1 on a digital video signal S1. A writing section records the digital video signal S2 on which the SS additional information SF1 is superimposed on a recording medium. Hereby, adding additional information to an information signal without deteriorating the quality of the read information signal so that the falsification and deletion are disabled, detecting the additional information added to the information signal if necessary and utilizing it are enabled.

Abstract: If only any one of a pair of an SS anti-duplication control signal S5 and copy guard signal S6 generated correlatively each other added on the video signal played back from the disk is detected, or if the specific anti-duplication control signal is not detected, the video signal recorded in the disk is judged to be an illegally duplicated video signal, and the output control signal generation section controls the output control section so as not to output the playback video signal S4.

Abstract: The PN code generation controlling means 15 produces a PN code generation clock signal PNCLK to generate the PN code of one chip to one vertical section and supplies this clock signal to an SS duplication preventing control signal generating means 16. The SS duplication preventing control signal generating means 16 generates the PN code of one chip to one vertical section depending on the PN code generation clock signal PNCLK and executes the spectrum spread to the duplication preventing control signal S3 using this PN code to form the SS duplication preventing control signal S5. The SS duplication preventing control signal S5 is superimposed to the image signal and is then output. Thereby, elimination and deterioration of the additional information which has been spectrum spread and is then superimposed into the image signal can be prevented to surely provide the additional information superimposed to the image signal.

Abstract: An anti-duplication control signal detection section detects an anti-duplication control signal added on a video signal S1 and supplies it to a system controller as a duplication prevention control information S2. A write control section of the system controller stops the duplication of the video signal in a disk if the anti-duplication control information is an information which indicates duplication inhibition. In this case, the video signal recorded in the disk is erased under the control from the erasing control section by the time the duplication prevention control corresponding to the anti-duplication control signal becomes active.

Abstract: A method of superimposing additional information on a video signal, transmitting it, and detecting the additional information from the transmitted video signal. The additional information is synchronized with a sync signal in the video signal, and generated in N(N≧1) unit intervals of one field of the video signal. Some predetermined unit intervals of the additional information generated in N(N≧1) unit intervals of one field of the video signal, are phase-inverted. The additional information is identified by detecting the information in unit intervals based on the sync signal in the video signal, and detecting that information in some predetermined unit intervals is inverted. The additional information is identified by detecting the information in unit intervals, and integrating the detection results with the information in inverted predetermined unit intervals inverted.

Abstract: When digital image signals fed in through an input terminal to be recorded on a disc, medium-related information, such as a serial number in a table of contents of the disc, is spectrum-spread in a spectrum spreading additional information generating section and the digital image signals on which the spectrum-spread medium-related information has been superimposed in an spectrum spreading additional information superimposing section are recorded on the disc. When the signals are to be reproduced, the reproduction can be performed if the medium-related information superimposed on the image signals recorded on the disc is consistent with the medium-related information of the disc on which the image signals are recorded. Thus, copying of the information signals can be limited to copying for private use.

Abstract: The PN code generation controlling means 15 produces a PN code generation clock signal PNCLK to generate the PN code of one chip to one vertical section and supplies this clock signal to an SS duplication preventing control signal generating means 16. The SS duplication preventing control signal generating means 16 generates the PN code of one chip to one vertical section depending on the PN code generation clock signal PNCLK and executes the spectrum spread to the duplication preventing control signal S3 using this PN code to form the SS duplication preventing control signal S5. The SS duplication preventing control signal S5 is superimposed on the image signal and is then output. Thereby, elimination and deterioration of the additional information which has been spectrum spread and is then superimposed on the image signal can be prevented to surely provide the additional information superimposed on the image signal.

Abstract: If only any one of a pair of an SS anti-duplication control signal S5 and copy guard signal S6 generated correlatively each other added on the video signal played back from the disk is detected, or if the specific anti-duplication control signal is not detected, the video signal recorded in the disk is judged to be an illegally duplicated video signal, and the output control signal generation section controls the output control section so as not to output the playback video signal S4.

Abstract: It is the object of this invention to extract spectrally spread additional information superimposed on the video signal rapidly and correctly. The output device 10 generates the PN code string every second vertical interval with reference to the video sync signal, and spectrally spreads the additional information using this PN code string. The spectrally spread additional information is superimposed on the video signal every second vertical interval and outputted. Upon receiving the video signal, in the recording device for recording the video signal on a recording medium, the video signal component is canceled each other between the video signal component in the vertical interval on which the additional information is superimposed and the video signal component in the vertical interval on which the additional information is not superimposed because of the field correlation of the video signal, and only the additional information is extracted.

Abstract: In a cartridge chamber of a camera is disposed a photoreflector to read a bar code formed on a disk attached to an end of a film spool. When a cartridge is loaded, the film spool is rotated more than one round in the direction to rewind the film. The photoreflector starts to read the bar code when supply of a driving force to rotate the spool is started. The leading part and the trailing part of the output signals of the photoreflector are compared in the reverse direction to find a point where signals corresponding to the constant rotation of the disk begin. The signals preceding the point are discarded and the initial position of the disk before it is rotated is determined based on the length of the signals truly representative of the bar code while the disk is rotating at the constant speed. Use condition of the film, unexposed, fully exposed, partly exposed or already developed, is judged from the initial position of the disk.