Abstract: A focusing waveform (Vf) is obtained by first generating (2) two intersecting triangular waveforms of opposite phase and half the deflection frequency. Subsequently, the difference between these two triangular waveforms is multiplied by itself for generating a second-order parabolic waveform at the deflection frequency, at which the parabolic waveform has a lower side which is located at zero and is not disturbed by DC offsets. In an advantageous embodiment of the invention, which is eminently suitable for multimedia applications, the focusing waveform has the correct form and amplitude, independent of the deflection frequency.

Abstract: A device and method that overlays, onto a new colored background a subject clipped from a source video image having a subject moving against a first colored background. A clipping key KD is calculated which makes it possible to separate the color space representing the image into three regions, a first region defining a volume representing the first colored background, a second region defining a volume representing the subject, and a third region representing a region of transition between the first colored background and the subject. A video image VD representing the subject moving against the new colored background formed according to the formula:VD=KD.times.subject video+(1-KD).times.background video,where "subject video" and background video respectively represent a video image containing the subject and the video image of the new colored background.

Abstract: During a period of transition from broadcasting analog TV signals to broadcasting digital TV signals, digital TV reception is susceptible to disruption owing to co-channel interference by analog TV signals. During this same transition period usually a digital TV receiver will incorporate an auxiliary analog TV receiver. This auxiliary analog TV receiver is advantageously used during digital TV signal reception for determining the amount of co-channel interference by analog TV signals, so that comb filtering can be selectively applied to symbol coding recovered from the digital TV signal, for suppressing artifacts of co-channel interfering analog TV signal when they are large enough to have substantial adverse on symbol decoding. The amount of NTSC co-channel interference is estimated by detecting the level of intercarrier generated by mixing the audio and video signals of the analog TV signal.

Abstract: In a broadband distribution system (SYS) for distributing television signals (TVS) and video signals (VOD), the return channel provided for requesting video signals is divided among the subscribers (TN) of the broadband distribution system (SYS) in such a way, that each group of subscribers (TN) is assigned a part of the return channel using time-division multiplexing, and the individual subscribers (TN) of a group have equal access to the part of the return channel assigned to the respective group. Access by the individual subscribers (TN) is monitored by a control unit (CONTROL) in the center (ZE) of the broadband distribution system (SYS). To synchronize the signals transmitted by the subscribers (TN) over the return channel using time-division multiplexing, the center (ZE) has a synchronizer (SYNC) which compensates for phase differences produced by differences in transit time.

Abstract: The system includes centralizing communications equipment (4) provided with first transmitter-receiver means (5, 6) connected to at least one transmit and receive cable (3) for transmitting and receiving radio signals, which cable extends throughout the served installation. The system also includes subscriber terminal appliances (2A to 2E) located in the installation and provided with second transmitter and/or receiver means (8 to 12) for transmitting and/or receiving radio signals, which means enable the terminal appliances to communicate via the communications equipment. The communications equipment re-transmits the signals that it receives to each destination terminal appliance in the installation and, with the assistance of additional means (27 to 31), outside said installation. The subscriber terminal appliances and the centralizing communications equipment respectively include means enabling them to transmit and/or receive digitized information signals in the form of packets and via radio links.

Abstract: A spot killer circuit for a CRT is capable of thoroughly removing any spot persistence and prevents damage to the fluorescent body of the CRT due to inaccurate horizontal and vertical deflection. When the power cord is unplugged, or when the display device is turned off (for example, via remote control key input), the bias voltage of the first grid G1 and the electric potential of the cathode are controlled so as to completely suppress any residual beam current flowing in the CRT. In the case of an inaccuracy (such as total failure) in either the horizontal deflection or the vertical deflection signals, the bias voltage of the first grid and the electric potential of the cathode are controlled to suppress the CRT beam current just as in the case of power shut off. This prevents damage of the fluorescent body in the CRT due to the inaccurate deflection operation.

Abstract: Physiological primary colors, which correspond to tristimulus values of each of picture elements of an image on a hard copy, are obtained. A parameter, which represents the degree of incomplete chromatic adaptation, is determined in accordance with a correlated color temperature of a white point of a CRT display device, on which the image is to be displayed. Temporary tristimulus values, which are to be reproduced on the CRT display device, are derived in accordance with the parameter. From the temporary tristimulus values, perception values relating to lightness, color vividness and hue, such as metric lightness, metric chroma, and a metric hue angle in the LAB-color space are calculated by taking the white point of the CRT display device as a viewing illuminance. The tristimulus values of the image are then transformed into the tristimulus values on the display device, and a soft copy image is formed on the display device in accordance with the transformed tristimulus values.

Abstract: In a synchronization stabilizing circuit and a television signal receiver, the follow-up range (TX) of the synchronizing signal (SH) is changed based on the judged result (J1) that it is judged whether or not the synchronizing signal (SH) itself exists and the judged result (J2) that it is judged whether or not the input signal exists in a follow-up range (TX), so that the signal can be synchronized easily in a short period even if the frequency of the synchronizing signal (SH) is deviated.

Abstract: A picture signal processing device for processing picture signals for displaying e.g., an enlarged picture, a contracted picture or a still picture. The picture signal processing device includes a motion detection unit for comparing the picture signal level of a pixel under detection in a first field or a second field together making up a frame, the picture signal levels of pixels lying close to the pixel under detection and the value of a variably set motion detection coefficient to one another for detecting the possible presence of motion in the picture of the pixel under detection. The first field is formed by every two scanning lines and the second field is formed by the remaining scanning lines.

Abstract: A component system includes a selector connected to at least one audio component, at least one video component includes a teletext receiver wherein audio and video signals output by the audio and video components as well as the teletext receiver can be selected, and when an operation to switch from an already selected component to the teletext receiver is carried out, a video signal produced by the teletext receiver is selected and output with an audio signal produced by the previously selected component remaining selected and output, allowing information transmitted by a teletext to be obtained without interrupting the audio signal being output by the previously selected component.

Abstract: A wireless system includes one or more transmitters and one or more remote receivers that are respectively coupled through one or more users and room ground. The transmitters each produce low-frequency, low power signals that, through capacitive coupling, pass as displacement currents into and from the body of the user, which acts as a conductive node. A receiver that couples capacitively to the user responds to the displacement currents and reproduces the signals. The transmitter includes a signal generator and a pair of electrodes. The signal generator produces modulated signals that vary the voltage between the electrodes, a first one of which is closely coupled capacitively to the user's body such that the "quasi-electrostatic" field resulting from the electrode potential causes a displacement current to pass to the user's body.

Abstract: A method for ascertaining the temporal relationship between two signals that traverse a network via two different channels concurrently sends a test signal through the two channels and evaluates the temporal relationship of the signal received at the outputs of the channels. The test signal is divided into presentation units and the temporal relationships are evaluated for foursomes of presentation units. A foursome of presentation units consists of an output presentation unit of one channel (channel 1), a matching input presentation unit of the same channel (channel 1), an input presentation unit of the other channel (channel 2) which has a time stamp that is identical, or essentially identical, to the time stamp of the input presentation unit of the one channel, and an output presentation unit of channel 2 which matches the input presentation unit of channel 2.

Abstract: A motion picture decoder uses a synchronous dynamic random access memory (SDRAM) as a frame memory in which the SDRAM is used, to store one frame of a video signal. By using an SDRAM which can operate at high speed, one frame of motion picture data is appropriately recorded in the SDRAM to enable rapid processing and complicated predictions of the motion compensation using the frame memory.

Abstract: A method and apparatus for reducing video crosstalk in a data carrier located within a lower vestigial sideband (VSB) of a standard television signal. Specifically, an apparatus according to the invention comprises a single bandpass filter for conditioning a VSB television signal, and a frequency interleaver for spectrally adding the data carrier to the lower VSB of the standard VSB video signal. The filter removes removing video components from the lower VSB of a standard VSB video signal, including frequencies greater than the highest frequency nominally associated with the lower VSB of the standard television signal, illustratively 250 Khz above the nominal VSB bandedge. The filter also boosts frequencies in a spectral boost region within a passband for boosting region. The boosted frequencies comprise image frequencies associated with the non-VSB spectrum attenuated by the filter.

Abstract: Vertical and horizontal sync signals are separated from an NTSC signal inputted from an outside by an external input circuit and a luminance signal (Y) and chrominance signals (B-Y, R-Y) are extracted and converted into RGB data. External RGB data and RGB data formed by a software are processed and the resultant data is supplied to an output converting circuit. The RGB data is converted into analog signals of the luminance signal and chrominance signals of a television signal by using individual system clock signals and outputted. A clock generating circuit generates two kinds of dot clocks which are used for the output converting circuit. The dot clock which is generated from the clock generating circuit and is used for conversion of the luminance signal is phase matched so as to follow a jitter of a horizontal sync signal (H) separated by an external video input circuit.

Abstract: A system for switching video of two different standards that uses a single crosspoint matrix and a single local controller coupled to two memory blocks for storage of crosspoint selection data. The crosspoint selection data is written to the crosspoint matrix according to the video reference signals that correspond to the crosspoint selection data to be written. Switching of the crosspoints then occurs according to the video reference signal corresponding to the crosspoints to be switched.

Abstract: An apparatus for processing a video signal by adjusting the contour of a picture. The apparatus includes an arrangement from a delay circuit 2 to a subtraction circuit 5 for extracting a contour of the picture and generating at least a signal opposite in polarity to a contour enhancement signal enhancing the extracted contour. The signal polarity is continuously varied from a maximum value of a positive polarity to a maximum value of an opposite polarity by a variable resistor RV2, an output of which is added to the input video signal by an addition circuit 6. With the processing apparatus, a picture can not only be raised in resolution as felt by the viewer, that is can be enhanced in contour, but also can be lowered in resolution as felt by the user, that is can be softened in contour. A corresponding method for processing a video signal by adjusting the contour of a picture and a video camera having the apparatus for processing the video signal in this manner are also disclosed.

Abstract: According to an information signal correction processing apparatus of the invention which includes a plurality of clip circuits, a knee circuit, an adder, and a controller, an information signal which has been obtained through the clip circuits by clipping an input information signal in accordance with a plurality of clipping characteristics which have been arbitrarily set and an information signal which has been obtained through the knee circuit by voltage dividing the input information signal in accordance with a voltage dividing ratio which has been arbitrarily set are added by the adder and, when the resultant signal is outputted, the plurality of clipping characteristics and the voltage dividing ratio are respectively controlled by the controller, so that the information signal can be processed without being deteriorated.

Abstract: The invention provides an electrical program guide system and method by which a desired program can be rapidly selected directly from among a large number of programs with certainty. A program selection screen as a multi-screen is formed from nine reduced screens reduced to one third in the horizontal and vertical directions from screens of programs broadcast on different broadcasting channels. A plurality of such program selection screens are transmitted to a reception side. On the reception side, the program selection screens are stored into a virtual frame memory so that reduced screens of them may make a single virtual screen. From among the reduced screens of the virtual frame, desired 3.times.3 reduced screens are read out and displayed on a multi-screen of full motion. A viewer finds and directly selects a desired program from within the 3.times.3 reduced screens of full motion displayed as the multi-screen.

Abstract: The invention relates to a method for determining a key KD for clipping a subject moving against a colored background, the said key making it possible to separate the color space into three regions, a first region defining a volume representing the colored background, a second region defining a volume representing the subject and a third region defining a transition region between the colored background and the subject, where the device and method defines the volume representing the colored background in the form of a cone of aperture angle .alpha. whose axis of symmetry (W) passes through the achromic and zero-luminance point of the color space and a point representing the color of the colored background. The invention also relates to any type of electronic apparatus implementing the abovementioned device and method, such as video mixers or autonomous devices for clipping and overlaying video images.