Abstract: A HDTV receiver which is improved in its overall performance and is simplified in its configuration, by improving a symbol timing restoring circuit, includes a tuner for selecting a necessary channel from input signals via an antenna, an IF processing & carrier restoring portion for performing an IF process & carrier restoration from the output of the tuner, an analog-to-digital converter (ADC) for converting the output of the IF processing & carrier restoring portion into a digital signal, a timing restoring portion for restoring a timing from the output of the ADC, a 2:1 down-sampler for 2:1 down-sampling the output of the ADC, a sync detector for detecting a sync from the output of the 2:1 down-sampler, a channel equalizer for performing a channel equalization from the output of the 2:1 down-sampler, a phase controller for correcting the phase error from the output of the channel equalizer, an optimal viterbi decoder for performing a viterbi decoding operation from the output of the phase controller, a dei

Abstract: A video display, which may be a television receiver with associated set top device, an intelligent television receiver, or a personal computer system enabled for television display, has associated therewith a remote control which controls modification of the visual images displayed. By use of the remote control, a human observer may cause a processor controlling the video display to execute a control program formulated in a particularly concise language and controlling the display of menus and the like. Menus are displayed as overlays onto a live motion video image. A display controller and video reception circuitry cooperating for displaying full motion video visual images occupying a minor portion of a viewable screen area and a menu display occupying a major portion of the screen area.

Abstract: Two additional structures for addition to the Digital Video Broadcasters (DVB) Service Information (SI) for implementation of the MPEG-2 Systems Standard (ISO/IEC 13818-1 are provided: the Logical Channel Table (LCT) and the Composite Channel Table (CCT). The LCT provides the mapping between a Logical Channel Number (LCN) representing a service and the transport stream/program number on which the service can be found. LCT entries may designate either simple conventional channels or Composite Channels. The LCT contains a Composite Channel Indicator (CCI), which when set to `1`, indicates that the selected channel is a composite channel. In this case, the LCT entry gives the home channel of the Composite Channel, which provides the CCT to the decoder so that the tuner can be retuned to the actual program designated in the CCT for current viewing. Each entry in the CCT associates a Composite Channel Number (CCN) with a LCN and represents the "present" definition for the composite channel.

Abstract: A television camera/recorder comprises a television camera unit for converting a scene into corresponding electrical signals, and a VTR for recording the electrical signals provided by the television camera unit and reproducing the recorded electrical signals. The signals reproduced by the VTR are converted into carrier television signals by an internal RF converter, and the carrier television signals are sent to an external television receiver through a first output jack connected by a cord to the external television receiver. The television camera/recorder may be additionally provided with an adapter capable of being detachably connected to a case containing the television camera unit, the VTR unit and the RF converter and provided with a second output jack capable of being connected to the first output jack provided on the case when the adapter is joined to the case.

Abstract: An interactive audio-visual (A/V) transceiver is advantageously coupled to a television and/or telephone (T/T) cable, a TV, a video recorder (VCR), and other A/V devices. The A/V transceiver switches data between a program/service provider and the connected A/V devices. In one embodiment, the transceiver includes three primary modules, a main module including a CPU, a system bus, system memory, an infra-red (IR) control unit, an audio-visual bus, an A/V decoder, an A/V processor, and an A/V encoder, an A/V connect module including a number of tuner/demodulators and a switch, and an optional CD ROM module. The A/V transceiver hardware is complemented with an operating system and software program which supports the functions provided in the A/V user interface.

Abstract: A multiple video data bus architecture permits high speed data transfer among the various circuit elements of a fluoroscopic imaging processor. This permits simultaneous acquisition, storage, display, and image enhancement of high resolution, i.e., 2K.times.2K images. A memory interface circuit compresses the video data for storage in bulk memory. The processor supports several high-resolution monitors which can respectively display radiographic images from different subjects, so that review and diagnosis can occur remotely.

Abstract: A television remote control system includes an on-screen cursor that is controllable by a viewer-operated remote transmitter. The remote transmitter includes a trackball that yields X,Y coordinate information responsive to rotational movement thereof and a switch that generates an activate signal responsive to depression of the trackball. A microprocessor in the television receiver controls the on-screen cursor display and updates the cursor position in response to transmitted IR X,Y position signals. A microprocessor in the remote transmitter monitors the trackball, the trackball operated switch and any other functional key switches. The television screen is divided into different control function areas and the areas are illuminated as each area is accessed by the cursor, i.e. as the designated cursor position impinges on the area. The cursor movement defined by the position signal is divided into a series of smaller movements to produce smooth cursor movements on the screen.

Abstract: A method for organizing and addressing memory of a digital video image is provided for one and two dimensional image processing using fast page mode accessing of memory, and also for displaying composite digital video images. A DRAM (12) is mapped to address locations storing segmented memory, non-segmented memory, line pointer tables, and horizontal description tables. The lines of a digital image are organized in DRAM (12) in either segmented memory or non-segmented memory. For segmented memory, each line of the image is broken up into equal line segments of pixels. Vertically aligned columns of line segments in the image are then stored in one or more rows of the DRAM (12). For non-segmented memory, each line is stored in a format where rows of DRAM (12) each represent a line of image data.

Abstract: A video camera is adapted to provide an asynchronous computer-friendly output signal instead of a standard analog video format. The output signal becomes a digitally-encoded message wherein each video frame becomes a serialized string of digital data demarcated by a digitally-encoded initiator identifying the ensuing data as characterizing that entire frame. The beginning of the entire set of frames that comprise the total video message is identified by a special header comprising a time stamp code and a format code.

Abstract: A video-scrambling system induces a random wobble i.e., time shifting, in the location of active portion of the video frame, without affecting the horizontal sync signal and colorburst in each video line, thus providing both security and concealment. The security is enhanced by filling in the gap between the nominal beginning of active video and the actual beginning of active video with a synthesized video signal which replicates the adjacent active video using a digitally generated filling pattern. Also, a random noise overlay further conceals the location of the gap. Additional concealment is provided by wiggling in time the location of the horizontal sync signal using one or two frequencies and also by randomly altering the location of the vertical sync signal. The NTSC digital encoding in accordance with the invention is simplified by using only two channels, chrominance and luminance, and by a heterodyne circuit for chrominance stability.

Abstract: A method and apparatus for compensating for a position of a main picture displayed on a display screen of a display includes a sub-picture processor, a chroma processor and a display controller. The sub-picture processor receives an intermediate frequency signal of a sub-picture, and produces a sub-picture video signal of a predetermined aspect ratio from the intermediate frequency signal. The chroma processor receives a main picture video signal representing the main picture, and the sub-picture video signal. The chroma processor generates a composite video signal from the main picture video signal and the sub-picture video signal, and outputs the composite video signal to the display. The display controller controls the sub-picture processor and the display such that the main picture and the sub-picture are displayed on the display screen with a position of the main picture shifted on the display screen in a first mode of operation.

Abstract: A device and method for removing co-channel conventional television signal interference from a digital signal by using an adaptive filter which tunes to the periodic components of the conventional television signal. The output of the adaptive filter is then subtracted from the received signal to produce an error signal. This error signal is then used to recursively update the taps of the adaptive filter. The invention also relates to the use of the adaptive filter in conjunction with a DFE.

Abstract: A projection type display apparatus incorporating a light receiver or a light transmitter, in which the light signal is received or transmitted through a screen or condensing lens disposed in its vicinity, and hence the luminous flux utility efficiency is high.A projection type display apparatus capable of preventing deterioration of picture quality due to difference in color in the projection units, and the best picture quality is realized even when the projection lenses for different colors are composed of nearly same components.

Abstract: A device for processing a modulated real analog television signal has a digital preprocessing stage for conditioning a complex digital signal for digital demodulation of a television signal at intermediate frequency. The digital signal preprocessing is carried out such that subsequent demodulation of the video and audio elements can be carried out at a favorable cost. Therefore a fully-digital signal processing for television signals, from the intermediate frequency, with a limited filter cost is possible.

Abstract: Digital signal receivers for detecting BPSK modulation of a suppressed carrier transmitted through the same channel as an analog television signal are described, in which the detected BPSK is digitized with an oversampling analog-to-digital converter prior to digital comb filtering for separating the BPSK from interfering analog television signal remnants. This is done to get an increased number of bits resolution from a relatively inexpensive flash converter so that the BPSK, which is of relatively low amplitude compared to maximally interfering analog television signal remnants, is not overwhelmed by quantizing noise. The oversampling analog-to-digital converter can be of sigma-delta type.

Abstract: An audio-visual system for a motor vehicle includes multiple viewing/listening stations, one station for each passenger. Each station includes a video monitor mounted in the back of the seat immediately in front of the user and includes an audio headphone terminal in a control panel adjacent each viewing station. The control panel includes a multiple position switch, which is connected to a distribution box for switching between multiple program sources for transmission to each viewing station. Accordingly, the user at each viewing station can independently switch between the program sources.

Abstract: A frequency counter obtains frequency data by measuring the frequency of an optionally offset broadcast signal tuned by a tuner having a VCO. A microprocessor is used to determine the frequency difference between the optionally offset signal and the previously tuned signal based on the frequency data measured for each signal, and controls the oscillation frequency of the VCO for the tuner based on this frequency difference using a PLL circuit. The frequency is quickly changed to tune in the optionally offset broadcast signal.

Abstract: A vertical impulse detecting circuit 104 detects the difference between a level of data of a present horizontal line of an input composite picture signal and a level of data of each of a horizontal line a plurality of lines ahead and a horizontal line a plurality of lines behind. Either an output signal of a three-line chrominance signal separating circuit 100 or an output signal of a horizontal chrominance signal separating circuit 101 is selected as a chrominance signal (CC) that is supplied to a subtracter 105 according to an output signal of the vertical impulse detecting circuit 104.

Abstract: Television viewers are presented with the opportunity to be diverted during intervals such as display of commercials, delays pending initiation of a near video on demand signal stream, and the like. The diversions take the form of overlaying on a frozen or continuing moving frame of visual images various game playing constructs manipulable by the remote control used to perform other control functions for the display device. The display device may be a television receiver linked to a set top device, an intelligent television receiver, or a personal computer provided with television image reception and display capability. Overlaying occurs over a frozen frame in certain disclosed diversions and over moving images in others. The accompanying audio signal stream may also be modified.

Abstract: A TV/video viewing supervision system that enables a supervisor, typically a parent controlling children's viewing, to selectably preprogram the hours, programs and/or channels of television, VCR, cable TV, satellite TV and/or game viewing that are allowed and/or blocked from viewing. The system features a channel/time matrix that can be programmed with a keypad-controlled cursor of a hand-held remote unit to set up a viewing schedule for future time period, for example a coming week.