Abstract: Quadrature-related outputs of synchronized color reference oscillator at +(R-Y) and +(B-Y) phases are applied to a first matrix to develop a first matrixed signal of a third intermediate phase. Additional matrixing operations on the oscillator outputs develop second and third matrixed signals of different phases symmetrically disposed about the third phase. A differential amplifier, of substantially fixed gain, with differential inputs respectively responsive to the second and third matrixed signals, develops a fourth matrixed signal, with a phase in quadrature relation with said third phase, across an output load. The reference signal input for a demodulator is derived from signals appearing across said output load.
Abstract: A color video signal reproducing apparatus comprises a carrier chrominance signal separation circuit for separating a carrier chrominance signal from a color video signal reproduced from a recording medium, a luminance signal separation circuit for separating a luminance signal from the reproduced color video signal, a demodulating circuit for demodulating the separated carrier chrominance signal into two color difference signals, where the demodulating circuit consists of demodulators for demodulating the carrier chrominance signal into the two color difference signals, an oscillator for supplying a predetermined frequency signal to the demodulators, and a control circuit for controlling the oscillation frequency of the oscillator according to a jitter component in the carrier chrominance signal, a reference signal producing circuit for producing a reference signal having a predetermined frequency, a modulating circuit for modulating the reference signal from the reference signal producing circuit, respectiv
Abstract: A signal processor for selective use with a conventional color television receiver for modifying the color image displayed on the screen of the receiver in order to enable a color photograph to be made by directly exposing a photosensitive material to the modified color image displayed on the screen of the receiver such that the photographic image is of an appearance substantially corresponding to the appearance of the image otherwise displayed on the screen of the receiver when the signal processor is not in use.
Abstract: A television receiving system for converting a video signal of one line standard to a video signal of another line standard. A field delay circuit is provided which separates the video signal of the one line standard into a high frequency and low frequency portion. The low frequency portion of the signal is processed to have a delay during one field different from the delay of a subsequent field. Independent processing means for the high frequency portion of the separated signal is provided. The processed high frequency and low frequency signals are combined to provide a video signal for converting to a different line standard. By processing the high frequency and low frequency portions of the video signal differently, a savings in hardware components is realized without material degradation in performance.
September 10, 1982
Date of Patent:
January 8, 1985
U.S. Philips Corporation
Marinus C. W. vanBuul, Johannes G. Raven, Wilhelmus H. C. A. van de Ven
Abstract: Color separation condition selecting means for setting up color separation conditions to a picture scanning and recording machine such as a color scanner and a color facsimile, wherein input means inputs factors for determining color separation conditions, processing means selectively outputs the most proper color separation conditions or a symbol representing those depending on the input factors, and output means outputs the selected result of the processing means, and wherein the processing means possesses a construction corresponding to a decision tree which is composed of the input factors and the color separation conditions resulting from the input factors.
Abstract: A recording system in a color video signal recording and/or reproducing system comprises a first filter for separating a luminance signal from a color video signal, a modulator for frequency-modulating the luminance signal, a second filter for separating a carrier chrominance signal from the color video signal, a first frequency converter for converting the frequency band of the carrier chrominance signal to a frequency band which is lower than frequencies occupied by the output luminance signal of the modulator, a superimposing circuit for superimposing the output of the frequency modulator and the output of the first frequency converter one on the other, a recording circuit for recording the superimposed signal onto a magnetic recording medium, a first separation circuit for separating a horizontal synchronizing signal from the color video signal, and a first frequency-converting signal forming circuit for forming a frequency-converting signal according to the horizontal synchronizing signal separated at th
Abstract: A method and apparatus for dropout compensation of composite color television signals is described in which both the luminance and chrominance components forming a dropout compensation signal are derived from the same portion of the original color television information signal without dropouts immediately preceding the dropout. One horizontal line of the color television signal without dropouts is continuously stored in a memory. When a dropout occurs, the stored television signal line is circulated in the memory. The length of delay of the chrominance component of the stored television signal is controlled from line to line in response to the phase of the color burst synchronizing component of the color television signal being compensated for dropouts. The length of delay of the luminance component of the stored television signal is controlled on consecutive lines in response to the horizontal line synchronizing component of the color television signal being compensated for dropouts.
Abstract: An automated acousto-optic tunable filter infrared analyzer system useable in a variety of industrial and commercial control applications. The system relies upon a narrow band pass tunable acousto-optic filter which is selectively tuned by predetermined rf frequency signals to selectively transmit the narrow band pass of interest which corresponds to a specific molecular species for identification and analysis. The system includes a microcomputer and associated memory function to measure and compare detected signals from an infrared detector which converts the filtered infrared signal to an electrical signal. The memory provides control signals for the computer and for controlling the sequence and frequency of rf energy applied to tune the filter. In this way, the near to mid range infrared can be analyzed for absorption bands corresponding to predetermined molecular species such as combustion product gases, and a feedback signal generated to control the combustion process.
February 2, 1982
Date of Patent:
December 25, 1984
Westinghouse Electric Corp.
Kenneth B. Steinbruegge, Milton S. Gottlieb
Abstract: A solid-state image pickup device has an image pickup element with a light-receiving surface on which a plurality of photoelectric conversion cells are arranged; a timing circuit, coupled to at least one and less than all of said photoelectric conversion cells of the image pickup element, for generating a timing signal when an output level of the photoelectric conversion cell corresponding to the amount of light incident on the photoelectric conversion cell connected thereto reaches a predetermined reference level; and a data reading unit coordinated with a shutter, coupled to the timing circuit for optically shielding the light-receiving surface of the image pickup element in response to the timing signal. The data reading unit reads image data on the light-receiving surface in an interval following the timing signal.
Abstract: In a signal processing device, such as a television receiver, a multiplex signal processing circuit with a switching device for selecting either a first image signal and a second image signal. A clamping circuit is provided for clamping the pedestal potential of the second signal at a reference voltage, a comparator compares the pedestal potential of the first signal with the reference voltage, and the pedestal potential of the first signal is equalized to the reference signal in accordance with the comparator output.
Abstract: The invention relates to a method for improving the delineation in color image reproduction by means of a partial, electronic retouch. The color values of the individual color separations gained by means of image point-wise, trichromatic color image scanning and digitization are deposited in a storage medium (1). In order to improve the delineation, the color values of a color separation are altered image point-wise by means of selectable quotas of the image point-wise allocated color values of at least one other color separation. The quotas of the color values respectively represent the smallest amount of change for the color values of the color separation to be partially retouched. A retouch factor is determined for each color value of an image point to be retouched which is marked by the retoucher by means of the coordinate pen (51) of a coordinate identifier device (50; 51; 52), said retouch factor specifying the degree of retouch as a plurality of the change amounts to be added per image point.
Abstract: One embodiment discloses a method and apparatus whereby each time a tape is wound upon a prescribed reel, the winding pattern may be assumed to leave the array of tape edges in a unique "edge profile" represented by the position of each winding edge as viewed from one side of the reel along a radial direction--this "profile" being interpreted as a "winding signature"; the signature may be detected and recorded in a convenient encoded fashion for possible use in uniquely identifying and documenting each unspooling/rewind sequence to thereby monitor tape use.
Abstract: A delay circuit comprising a pair of modulators for executing biaxial quadrature modulation with carriers that have a 90.degree. phase difference therebetween, a mixer which mixes the modulated output signals of the modulators together to produce a composite output signal, delay circuitry for delaying the composite output signal of the signal mixer, and a pair of demodulators which are respectively associated with the pair of modulators and serve to demodulate the delayed output signal supplied by the delay circuitry. The first of the two demodulators associated with the first of the two modulators, produces a first demodulated output signal, a portion of which is supplied to the second of the two modulators as a modulating signal. Additionally, the first demodulated output signal is delayed by the delay circuitry for a predetermined duration with respect to an input signal fed to the first modulator.
Abstract: A pattern matching device generally comprises a first circuit (36) for calculating an elementary similarity measure between two feature vectors, one and the other selected from two feature vector sequences representative of two patterns, respectively, and a second circuit (37) for iteratively calculating a recurrence formula which defines a recurrence value by a sum of such an elementary similarity measure and an extremum of a prescribed number of previously calculated recurrence values. The recurrence formula eventually gives an overall similarity measure between the two patterns. The elementary similarity measure is now calculated by calculating a primitive similarity measure by a conventional circuit (15) and subtracting a predetermined value therefrom by a compensation circuit (31). Preferably, the second circuit (37) comprises circuitry (41, 42) for preventing the sum from overflowing outwardly of a preselected range.
Abstract: In a video tape recorder for recording a television signal composed of a picture carrier which has been frequency modulated with a video luminance signal, a chrominance subcarrier which has been modulated with a chrominance signal, and a plurality of audio carrier signals each composed of an audio carrier which has been frequency modulated with a respective audio signal along a recording track, and for playing such a signal, there are provided a recorder portion including circuits for reducing the audio carrier signals in frequency by difference formation of the television signal audio carrier signals with a stabilized reference frequency signal, and for recording the reduced frequency audio carrier signals with their original frequency separation in a frequency band located, in the recorded signal, essentially between the frequency spectrum of the chrominance subcarrier and a location in the frequency spectrum of the picture carrier, and a playback portion including circuits for returning the reduced frequen
Abstract: A system is described which makes use of the fact that in a raster scanned television system a high degree of correlation exists both in the luminance and in the chrominance signals of a pair of adjacent lines. Because of this correlation, the difference between the luminance signals of the two lines is usually much smaller than the luminance signal of either line alone, and requires less bandwidth. A luminance carrier is amplitude modulated by the average value of two adjacent lines, while the phase of the carrier is modulated by the difference of two adjacent lines. The bandwidth of the resulting signal is comparable to that of a carrier that is amplitude modulated by a single raster line. Since two lines of information are being transmitted, however, it would be possible to take twice as much time to transmit them as when only a single line is being transmitted. Stretching the time axis in this way results in a factor of about two reduction in bandwidth.
Abstract: A color video signal reproducing apparatus, such as a VTR, is capable of being operated in a normal speed reproduction mode, as well as in non-normal modes such as stop motion, slow motion, and fast motion. A rotary pick-up head on the apparatus is mounted, e.g., on a bi-morph leaf, for helical and transverse motion so as to scan recorded tracks accurately when the apparatus is in a non-normal mode. A first time base corrector processes the reproduced color video signal in composite form to provide a first corrected composite color video signal.
Abstract: A velocity error compensator is provided for use in a time base corrector of the type having a memory into which successive samples of a periodic information signal, such as a video signal, are written at a write-in rate that is synchronized with time base errors in the information signal, such that plural periods, such as plural lines, of the information signal are stored in the memory, and from which the successive samples are read at a constant read-out rate. The velocity error compensator comprises a velocity error detector for detecting velocity errors in successive periods, or lines, of the information signal written into the memory; and a sample level compensator for compensating the level of a sample read out from the memory as a function of the detected velocity error, such that the level of the read out sample is modified to be equal to the level that the read out sample should have had at the time it was read out if there had been no velocity error.
Abstract: A pattern detecting apparatus is disclosed which comprises, in order to detect the center of a positioning pattern on a sample with high accuracy in a wide range, means for illuminating the positioning pattern, means for defining an illumination range in which the positioning pattern is illuminated, means for focusing reflected light from the positioning pattern on a predetermined image plane, means for electrically detecting a bright and dark image on the image plane in accordance with positions on the image plane, means for removing a signal corresponding to the outside of the illumination range from the output signal of the detecting means and for holding, in place of the removed signal, a level of the output signal produced within the illumination range, and means for detecting a position of the center of the positioning pattern from the output signal of the holding means.