Abstract: In a color television system the luminance signal is split into high and low frequency components, and the high-frequency luminance components are frequency shifted to above the conventional television bandwidth. A conventional receiver uses the low-frequency luminance components (Y.sub.1) and the chrominance component (C), with no cross effects between them. A high-quality receiver can be constructed to recombine the low-frequency and high-frequency luminance components (Y.sub.1 and Y.sub.2 ') giving improved luminance detail, again without cross effects with the chrominance signal. The sound signal (S) is carried between the chrominance and high-frequency luminance. A transmitter (FIG. 4) and receiver (FIG. 5) are described. The system has particular applicability to satellite and cable television.

Abstract: In a digital television receiver, a digital signal processing system generates samples of binary coded color mixture digital signals that are a representation of color picture information. The values of binary coded coefficients that convert the representation of the color picture information into binary coded color difference signals are stored in a memory accessed by a microprocessor. In response to adjustment of controls such as contrast and tint, the microprocessor modifies the coefficients. The modified coefficients are placed in a digital store such as a latch arrangement. A multiplier arrangement receives samples of the color mixture digital signals as first inputs for multiplying them by corresponding modified coefficients that are supplied by the digital store as second inputs.

Abstract: A method and apparatus for sampling a sine wave input signal E(t) with a sampling signal A(t) so as to minimize, in one adjustment, the phase difference between the input signal E(t) and the sampling signal A(t). The input signal E(t) has a frequency F and a cycle T and is used to generate a signal D(t) which has a frequency kf and a phase which is dependent on the phase of input signal E(t), k is a positive integer. The signal D(t) is used to generate a sampling signal A(t) which has a plurality p of possible phase settings, p is a positive integer. Each phase setting is adjusted, with respect to its neighbor phase settings, by increments of T/kp. The phase difference between the sampling signal A(t) and the input signal E(t) is then determined. One of the p possible phase settings of sampling signal A(t) is then selected which minimizes the phase difference. The sampling signal A(t) will thus have a phase which has been adjusted to within T/kp of the input signal phase, in one jump.

Abstract: A dropout compensation circuit for a reproduced video signal in a reproducing apparatus for reproducing a composite color video signal recorded in a recording medium, wherein the composite color video signal consists of a luminance signal occupying a predetermined frequency band and a carrier chrominance signal multiplexed with a common frequency band at a high frequency part of the luminance signal, comprises an amplitude modulator for amplitude-modulating a carrier by a reproduced composite color video signal, a delay circuit having a frequency band for passing a part excluding a higher frequency part of an upper side band and a lower frequency part of a lower side band of an output amplitude-modulated signal of the amplitude modulator, and delaying the signal by a predetermined delay time, a demodulating circuit for demodulating an output amplitude-modulated signal of the delay circuit, a detection circuit for detecting dropout within the reproduced composite color video signal, a switching circuit switche

Abstract: A filter network suitable for translating a signal such as a demodulated "I" chrominance component of a composite color television signal is disclosed. The filter network comprises first and second cascaded sections with mutually grossly mismatched terminating impedances, and are passively interconnected via a resistance of a value which substantially precludes interaction between the sections over a given range of frequencies within the passband of the signals being translated. Both sections are separately excited with signals to be translated. The first section provides wideband filtering and a large amount of delay relative to that provided by the second section. The second section provides signal amplitude peaking within a given portion of the frequency passband of the first section.

Abstract: A filter network suitable for processing a signal such as the demodulated "I" chrominance component of a composite color television signal is disclosed. The filter network comprises plural cascaded mutually interactive resonant LC sections for providing wideband filtering, amplitude peaking over a prescribed range of signal frequencies, and signal delay. Mismatched resistors terminate the filter network and constitute the primary DC impedance of the filter network, and the LC sections exhibit selected impedances at frequencies within the peaking frequency range.

Abstract: A method is disclosed for projecting a pair of stereoscopic pictures (10, 11 or 23, 27) which can be seen in three dimensions without the observer (22) wearing special spectacles or using other optical aids. The system is adapted to be practical with relatively large screens (18, 30) in very compact forms including use as a table top computer display or in other restricted cabinets. The combination includes a pair of adjacent large projection optics (14, 15 or 28, 29) and a beam splitter (16, 26) capable of both light transmission and light reflection and which is positioned twice in the light path (12, 13) from the source to the observer, and which is particularly suited for compact forms of the device.

Abstract: Hue and saturation are modified in a composite video signal processor by detecting the phase of the chrominance signal component to determine if it possesses phase components at or near a predetermined phase angle. If such components exist, quadrature related saturation and hue modifying signals are added to the composite video signal in controlled proportions and polarities to provide a resultant composite video signal in which a specified color or range of colors is modified. The modifying signals are inhibited by a masking unit to confine the color modification to predetermined areas of the displayed color image. Specific picture locations where color changes occur are identified by substituting an AC signal within the luminance frequency band for the color modifying signals. A desaturation signal derived from the hue modifying signals is added to the composite video signal to minimize changes in saturation level of the composite video signal as hue is changed.

Abstract: A first video signal is provided comprising a plurality of lines of a luminance signal, a first color signal and a second color signal, each of the lines having a duration of a first predetermined time. Each of the nonoverlapping pairs of successive lines of the luminance signal are summed and differenced to provide a luminance sum signal and a luminance difference signal. Each of the nonoverlapping pairs of successive lines of the first color signal and also of the second color signal are summed to provide a first color sum signal and a second color sum signal. The luminance difference signal, the first color sum signal and the second color sum signal are bandwidth limited in relation to the luminance sum signal. Corresponding lines of these signals are time compressed to the same bandwidth and then time multiplexed to form a corresponding line of a first compound signal, each line of which has a duration of the aforementioned predetermined time, and alternate lines of which have zero amplitude.

Abstract: A high-definition camera uses sinuous or line scanning to produce wide bandwidth signals having high-definition in the horizontal and vertical directions. A wobble signal having a wobble chosen at an even integer multiple of one-half the line rate is used to create the sinuous scanning. The phase of the wobble signal is inverted on alternate frames to provide a full raster scan on a high-definition television receiver. A low pass filter produces a limited bandwidth signal from the wide bandwidth signal. The limited bandwidth signal is compatible with standard definition broadcast systems and receivers. At the receiver the high-definition image may be recreated by using a delta signal representative of the difference between the high-definition signal and the standard definition signal in conjunction with the limited bandwidth signal. The delta signal and its addresses may be transmitted during the vertical blanking interval.

Abstract: A set-top teletext converter decodes the chroma burst signal of a color television signal with the substantially same amplitude and phase as the burst in the television signal. The teletext signal along with its transparent mode signal are decoded. The decoded teletext signal is then re-encoded as a standard television signal using the decoded burst signal. When switching between the encoded teletext signal and the regular television signal under the control of the transparent mode signal, no color shift is present.

Abstract: The invention provides a color framing circuit for a digital memory, which has a first read line flip-flop generator for producing an RLFF.sub.0 pulse; a toggle flip-flop for receiving a loading data from a memory using a vertical pulse or a delayed (1H) vertical pulse as a load timing pulse only when the RLFF.sub.0 pulse is high and for producing an output signal (RLFF.sub.1 pulse); a vertical selector for selecting one of the vertical pulse and the delayed vertical pulse when the output signal from the toggle flip-flop is high; a read address counter for producing an address signal; and a blanking/burst generator for receiving the RLFF.sub.0 and RLFF.sub.1 pulses as control pulses, thereby receiving as a read address signal the address signal from the address counter. An output video signal phase offset is decreased corresponding to a range of 140 ns (peak-to-peak), and one of the address counters is eliminated.

Abstract: The present invention relates to an image display system, and more particularly to an image display system intended for use in the artificial diagnosis of requirements for the determination of print exposures in making prints from the images on a photographic film.

Abstract: An AFC circuit for use in a television tuner includes a mislocking prevention device for shifting the AFC voltage toward the audio carrier when the power switch is turned on or the channel is changed, so that the color carrier will not be inadvertently locked.

Abstract: In a color TV receiver, color saturation errors associated with flesh tone correction circuits operating on demodulated color mixture signals are corrected. This is accomplished by adding the absolute value of a fraction of one of the color mixture signals to the color mixture signal in quadrature phasing therewith.

Abstract: Bilevel coding of color video signals, for example video teleconference or NTSC broadcast television signals, is used to reduce the required storage capacity or transmission channel bandwidth. Each multi-level or continuous tone picture element in a frame is compared to a threshold and assigned one of two values depending upon whether or not it exceeds the threshold value. The threshold is produced by averaging the luminance components of neighboring picture elements and constraining the average by a signal derived from the chrominance of the original video signal. A significant feature is that the use of the chrominance signal in this way obviates the need, common to known monochrome systems, of adding noise (or dither signal) to the signal with concomitant picture degrading artifacts.

Abstract: Video information from scanned separations is stored on a video tape recorder (VTR) after processing and formating. Video information stored on the tape of the VTR may be input into the memory of a separations previewer after decoding and processing. A controller controls the operation of switches which route the information and the VTR. A keyboard, control panel and printer interface with the controller.

Abstract: A light pattern image forming system has an intermittent light source for generating pulses of light over an optical path. The system includes a variety of elements constructed and arranged for independent degrees of freedom of motion and for relative motion off axis with respect to each other. In a preferred embodiment a color wheel comprising sectors of different color light transmitting material, is mounted for rotation about a first center of rotation. The first center of rotation is offset from the intermittent light source so that sectors of different color light transmitting material pass adjacent to the light source for generating multicolor pulses of light over the optical path. A mask is also mounted for rotation about a second center of rotation offset from the first center of rotation and spaced from the color wheel.

Abstract: In processing color video signals in sampled data format, the sample rate is nominally far in excess of that required to process the baseband color signals. Thus, when the chrominance signal is demodulated only certain ones of the chrominance signal samples need to be demultiplexed from the data stream to reconstruct the color mixture signals. It is convenient to phase lock a clock to the data stream and select like samples from every sequence of samples. However, the NTSC video format provides a chrominance signal which has a 180 degree phase displacement from line-to-line. Thus, if like samples are selected from all lines, there will be a line-to-line spatial translation of image points on the displayed image giving rise to fine dot crawl along vertical edges of color transitions. The present invention includes a demodulator which demultiplexes sample points which are vertically aligned line-to-line and complements (inverts the polarity) of the samples on every other line.

Abstract: The invention provides a color image pickup device in which image light from a white object to be photographed or image light integrated by a diffusion plate or the like is incident on a pickup tube through an electrochromic element. Two primary color signals are separated from a video signal from the pickup tube, a voltage corresponding to a difference between the two primary color signals is detected by a differential amplifier, and the voltage is then applied across an electrochromic element. A spectral transmittance of which is then controlled, thereby achieving an optimal white balance.