Abstract: A first video signal component and a second video signal component represent constituent portions of an image to be displayed. An analog signal blending network blends these components together along a boundary region several pixels wide to reconstitute a video signal representing the image to be displayed. The blending network includes first and second active analog devices which exhibit mutually opposite gain over the boundary region to response to a common gain control signal, to produce a virtually invisible seam along the boundary region.

Abstract: A motion estimator for high definition television transmission comprises a device which operates after motions have been estimated for an image (51), when the motions in a following image (53) are to be estimated. This device associates with a part (R) examined in an image (53) a group (5) of a plurality of parts of the preceding image (51) which group contains the part occupying, in the image, the same position as the examined part and likewise the adjacent parts, and investigates whether one of the nine motions determined for the nine parts of the said group (5) can be applied to the part R. If this is the case, the operation of the estimator is terminated for the part (R) examined and, moreover, the transmission of the motion for this part is then effected not by transmitting the value of the motion, but by designating that one of the parts of the group (5), the motion of which is appropriate.

Abstract: A system for transmitting digital sound signals in a standard broadcast video signal includes apparatus for removing video signals from a portion of the vestigial sideband of the broadcast video signal and inserting coded digital sound signals therein.

Abstract: There is provided an image processing apparatus comprising an image signal generator having a first processing unit for processing the image signal in a first mode and generating a first processed signal, a discriminator for discriminating characteristics of the image signal, the discriminator having a selector for selecting the first processed signal according to a discrimination result; and a pulse width modulated signal generator for processing the first processed signal from the selector by using a pattern signal and for generating a pulse width modulated signal.

Abstract: In a television control room wherein a program director must observe a multiplicity of television monitors, the monitors are illuminated by ultraviolet light. The labels used to identify the input sources for the monitors may be made of an ultraviolet reflective material and the labeling indicia written in ultraviolet opaque ink. Alternatively, the label may be ultraviolet opaque and the ink ultraviolet reflective.

Abstract: A high definition television system includes an encoder for encoding a video source signal having a horizontal bandwidth of about 28-30 MHz for transmission through a 6 MHz RF channel. The video source signal is provided in the form of a plurality of horizontal video lines occurring at a vertical rate equal to the NTSC field repetition rate and at a predetermined horizontal rate greater than the NTSC horizontal scanning rate. The video lines of the source signal are encoded for transmission at NTSC vertical and horizontal rates, with the lines representing the lower frequencies of the video source signal being transmitted at a higher temporal rate than the lines representing the higher frequencies. The transmitted lines are converted to a plurality of display lines by a receiver for display at a vertical rate equal to the NTSC field repetition rate and at a horizontal rate equal to the predetermined horizontal rate.

Abstract: An interpolation circuit, in which a digital signal produced by sampling and quantizing an analog information sequentially is encoded so that, in case a certain one of the encoded sample data is erroneous, a correct data in place of the erroneous sample data is prepared as an interpolation data by interpolating other correct sample data. The interpolation circuit includes: a first extrapolation circuit for generating a first extrapolation data by extrapolating two sample data preceding the erroneous sample data to the position of said erroneous sample data, a second extrapolation circuit for generating a second extrapolation data by extrapolating the two sample data succeeding the erroneous sample data to the position of the erroneous sample data, and an averaging circuit for generating the interpolation data by arithmetically averaging the first and second extrapolation data.

Abstract: A televison signal transmission system comprising transmitting stations and receiving stations. Each transmitting station has a signal-transmitting circuit and a signal-superposing circuit. The signal-superposing circuit superposes a discriminant signal on a television signal during a vertical-blanking interval of the television signal. The discriminant signal is required for selecting the television signal. The signal-transmitting circuit inserts the television signals, containing the discriminant signal, into the communication channel assigned to the transmitting station, and then transmits the television signal to the receiving stations. Each receiving station has a signal-receiving circuit, a signal-detecting circuit, and a signal-selecting circuit. The signal-receiving circuit receives the television signals transmitted from the transmitting stations.

Abstract: For economy in electronic components and their interconnections a multiplex memory system for temporary storage of digital signals, especially digital video signals, is made up of memory units each of which stores the contents of the same bit place of different data words of the data arriving at the memory system. The corresponding bits of eight words are entered in parallel in each memory. The system can be configured with memory components presently available for any desired data word bit width without waste of storage capacity. For each multiplex memory plane constituted by the memory unit for a particular bit place, only two shift registers are needed for writing into and reading out of a RAM, provided that one of the two shift registers has a built-up in D register for parallel output, a feature that is commonly available commercially. This is much more convenient and economical than the requirement of three D registers per multiplex memory plane in a conventional multiplex memory.

Abstract: An NTSC compatible, single broadcast channel, widescreen EDTV system encodes and decodes a television signal comprising four components: (1) a main, standard format NTSC signal with low frequency side panel image information compressed into the overscan regions thereof; (2) time expanded high frequency side panel image information; (3) extended high frequency horizontal luminance image information; and (4) vertical-temporal luminance image information. Components (2) and (3) are intraframe averaged and quadrature modulate an alternate subcarrier, e.g., at 3.108 MHz, to produce a modulated signal. The modulated signal is summed with component (1) after intraframe averaging to produce an NTSC compatible 4.2 MHz baseband signal. This signal and component (4) quadrature modulate an RF picture carrier to produce an NTSC compatible RF broadcast signal for transmission via a single broadcast channel.

Abstract: The invention provides a TV of internal PiP type for receiving the character multibroadcasting which installs the character multiblock having PiP block which is constructed so that a complex signal or a composite image signal of the IF circuit are selected at a switching board and is applied to a Y/C processor and a PiP processor, the device comprising, a teletext-processing circuit for providing a composite synchronization signal and RGB signal after extraction and decoding of the character multiinformation included in the composite image signal which is provided from the intermediate frequency(IF) circuit an encoder for providing a first composite image signal by encoding said composite synchronization signal and RGB signal, and a switch for providing the composite image signals provided from said IF circuit and the encoder, respectively, to the switching board by switching of a control signal provided from the teletext-processing circuit.

Abstract: An address control circuit for a video memory of a multi-image display system. The circuit includes a video signal source, a video memory for storing the video signal, an address holding circuit for controlling write addresses of the video memory which outputs address values during a video image period and holds address value corresponding to a start instance of a blanking period during the blanking period and a bias generating circuit for positioning address areas of the video memory in which the video signal is stored.

Abstract: An image signal processor includes a memory device for storing an image signal representative of a picture during one field period, an operating unit for generating a READ-OUT command necessary to read out contents stored in the memory device, a selector for selectively switching the memory device between a WRITE-IN READY condition and a READ-OUT READY condition, and a switching control unit for generating a control signal necessary to control the switching operation of the selector. The switching control unit is adapted to receive the READ-OUT command and a vertical synchronizing signal included in a composite video signal. The selector performs the switching operation in synchronism with the initial vertical synchronizing signal applied immediately after the READ-OUT command has been inputted.

Abstract: A receiver-compatible EDTV system wherein enhancement information is adaptively modulated to suppress channel noise and is transmitted outside the usable picture area of a receiver compatible signal of the receiver compatible EDTV system.

Abstract: A white balance adjusting circuit which detects the ratio of color components in an illumination light around an object, independently from an image sensing system, and controls the gain of each color signal coming from the image sensing system, characterized in that it comprises means for correcting a signal indicative of the ratio of color components according to the color signal, not gain-controlled, coming from the image sensing system.

Abstract: A video camera for photographing papers which is used in a video apparatus for office automation such as an electronic image input apparatus. The video camera includes an image pickup part for picking up the images of papers and a signal processing part for converting a video signal obtained from the image pickup part into a given format. The signal processing part includes a .gamma. correction circuit for correcting the .gamma. value of the video signal obtained from the image pickup part. The .gamma. correction circuit has at least two discrete .gamma. correction values so that a proper .gamma. correction value can be selected according to the objects to be photographted. For example, when the objects to be photographted are black and white papers, a value of 0.45 or greater is selected for the .gamma. correction value. By selecting the .gamma.

Abstract: Horizontal synchronizing signals included in a video signal are inputted to a PLL circuit. A counter as a divider in the PLL circuit outputs signals which are synchronized with the horizontal synchronizing signals. A gate pulse generator counts the output pulses of counter and produces a control signal for controlling a phase comparator as one of elements of the PLL circuit. The operation of phase comparator is stopped in vertical intervals in accordance with the control signal so that the phase comparator is not affected by signals which are included in the video signal and are not synchronized with the horizontal synchronizing signals. Thus, the PLL circuit produces pulses which are synchronized with the horizontal synchronizing signals in a wide frequency range.

Abstract: A monostable, that is triggered by either positive or negative polarity horizontal sync pulses, supplies the horizontal deflection system of a monitor. A first transistor of the monostable has its emitter and its base connected through oppositely poled diodes to the horizontal sync input terminal of the monitor. Incoming horizontal sync pulses of either polarity trigger a respective one of the diodes to drive the first transistor into conduction. The time constant of the first transistor is selected to be slightly greater than the duration of the input sync pulses to preclude the monostable triggering on the trailing edge of a sync pulse.

Abstract: A keyed type synchronization wave detecting circuit comprises a phase wave detector for synchronizing and wave detecting a composite video signal responsive to a signal for wave detection. A synchronizing signal generator provides a horizontal synchronizing signal controlled by the frequency of a horizontal synchronizing signal of the composite video signal. A keying pulse generator provides a keying pulse signal from the synchronizing signal of the synchronizing signal generator. A phase controller outputs a phase difference signal in accordance with the difference in phase between the signal for wave detection and a carrier of the composite video signal such that the phase difference approaches a predetermined level, the phase controller having a comparator for performing a keying outputting operation of the phase difference signal by the input of the keying pulse signal, and a filter for removing the high frequency component of the phase difference signal and forming a control signal.

Abstract: An automatic optical filter displacing circuit for optimizing the white balance of video cameras is disclosed which comprises a buffer means; a sample and holder means for producing average values of the buffered luminance signals and for carrying out a sampling out of the average values; a first reference signal supply means; a first comparing means; a second reference signal supply means; a second comparing means; an optical filter control means; a trigger means for generating a white balance setting signal automatically; and a power supply means. The optical filters are automatically displaced so as to achieve the optimum state of the white balance by making judgements on the color temperature condition and the light amount condition of the illumination, and the electrical corrections are decided optimally depending on the illuminating conditions, thereby producing a good image quality.