Abstract: An improved digital integrated chrominance-channel circuit having gain control for color-television receivers includes at least one integrated circuit for digitally processing the composite color signal. The circuit includes a first limiter inserted between a parallel multiplier and a burst-amplitude-measuring stage, and a control stage including a parallel subtracter whose minuend input is fed with a reference signal, and whose subtrahend input is connected to the output of the burst-amplitude-measuring stage. A digital accumulator whose enable input is presented with a signal derived from the trailing edge of a burst gating signal is used as an integrator.

Abstract: Method and apparatus for the reproduction of an image with coarser resolution than used during scanning wherein the original image is opto-electronically scanned point-wise and line-wise with a prescribed resolution and is converted into digital image signals, and a field containing as many image points as is used for one coarse image point is extracted from the digital image signals, and wherein weighting is undertaken for the individual image signals of the image points of said field and a corresponding image signal for the coarse image point is obtained by means of combining the weighted image signals.

Abstract: Sequential scanned scaled density data representing a varying tone image is electronically screened to form binary element data that when imaged to form an array of orthogonally arranged binary elements on a member produces screened color separation plates of that original image suitable for use as the printing plates in a lithographic printing press. Screening occurs by comparing sequential density data with selected screen matrix data contained in a memory. The matrix data is ordered with density values increasing outwardly from the matrix center to the corners and edges. The matrix data is selected from matrix locations related to the desired screen frequency and angle with the selected matrix locations being determined by the application of fundamental right triangle trigonometric relationships to the matrix. Screening and imaging occurs sequentially with two density data being compared to matrix data simultaneously.

Abstract: A filter circuit for processing a composite video signal comprises a series circuit of a delay device for delaying an input composite video signal for the duration of one line of the video signal and a first bandpass filter connected to the delay device to receive the delayed video signal. A transversal bandpass filter receives the input composite video signal and provides as outputs a delayed composite video signal and a delayed chrominance component. A first summing device sums the delayed chrominance component and the output of the series circuit, while a second summing device sums the delayed composite video signal and the output of the first summing device. The series circuit can be selectively disabled so as not to apply the delayed video signal to the first summing device.

Abstract: An image pickup device comprises a main image pickup body, and a holding part provided angularly rotatable on one side surface of the main image pickup body. The holding part is mounted to rotate angularly in a plane other than a plane which is parallel to a vertical plane, where this vertical plane includes a center of gravity of the image pickup device and an optical axis or a straight line parallel to the optical axis of the image pickup device. The holding part is separated by a predetermined distance from the one side surface of the main image pickup device at an accommodated position thereof where the holding part extends along the one side surface of the main image pickup body, and a free end of the holding part lies substantially within the above vertical plane at a fully rotated position thereof where the holding part is drawn out in front of the main image pickup body.

Abstract: The present invention relates to the improved demodulation system which improves the noise characteristics for the demodulation of a wideband television FM signal. A variable bandpass filter (8), the center frequency and the bandwidth of which are controllable, for improving C/N, is inserted at the output of a reference bandpass filter (7) in an FM signal path. The bandwidth of the variable bandpass filter (8) is controlled so that said bandwidth is wide when the input carrier level is high, and said bandwidth is narrow when the input carrier level is low. The center frequency of the variable bandwidth filter (8) is controlled so that said center frequency follows to the instantaneous frequency of the color sub-carrier component (3.58 MHz). Said color sub-carrier component is derived by a narrow-band bandpass filter (10) coupled with the output of said discriminator (9) for controlling the center frequency of the variable bandpass filter (8).

Abstract: Apparatus providing a magnified picture display for a television receiver employs a reduced-size digital memory which stores only the digitized video signal components necessary to generate video signals to produce the magnified picture display. A simplified user-controlled picture positioning arrangement generates write and read addressing signals for the digital memory representative of both the picture area of the magnified picture display and of the normal picture display therein which is to be magnified. Writing of the digitized video signal components of the normal picture display into the digital memory is accomplished in "real time" whereas reading of the stored data from the memory and signal processing to develop interpolated digitized video signal components of the magnified picture is accomplished at a reduced processing rate on a line-by-line basis in between memory write cycles.

Abstract: A system for measuring the black matrix on the faceplate of a color television picture tube provides measurements of the matrix line widths, the transparent space widths and the periods of the color barwidths formed by the lines and spaces.

Abstract: Apparatus for synchronizing rotational speed of a color filter wheel to a video field rate using a stepping motor drive. The derivation of the stepping rate is taken directly from the video system's master clock through dividers and a phase locked loop which provide the required fractional rate division. An integrating capacitor in the phase locked loop controls the output of a voltage control oscillator so that at power up the capacitor is charged at a relatively slow rate thus ramping up the stepping rate of the motor until phase locking is achieved. A pair of optical switches monitor the rotation of the filter wheel. If the switches are not made within a predetermined number of steps, the integrating capacitor is discharged and the ramping procedure reinitiated.

Abstract: As is well known, a virtually flicker-free picture is obtained by using a sufficiently high picture-reproducing frequency and doing without interlaced scanning. This is achieved with a suitable standard converter in which the picture is temporarily stored in digital form. By suitable multiplexing, the digital frame store (221, 222, 223) can also be used for the conversion of the text and graphics page. Multiplexer (26) and demultiplexer (27) are switched by a blanking signal (Blank, Blank') which is buffered in the frame store together with the associated picture section.

Abstract: In a color TV receiver, a composite video signal processing circuit serves to prepare the signal input to a CCD comb filter, and includes a transistor phase splitter with a first load resistor connected to the transistor's collector electrode and a second load resistor connected to the transistor's emitter electrode. A reactance of a first sign couples the collector electrode to an output terminal, while a reactance of the opposite sign couples the emitter electrode to the same output terminal. A capacitor between the transistor's collector and base electrodes provides a negative feedback path for signal components. Parameter values are selected to provide the processing circuit with a peak response at a frequency above the frequency band occupied by the composite video signals. Processing circuit provides a substantially constant group delay for signal frequencies throughout the band, while compensating for decline at high signal frequencies of IF amplifier's amplitude-versus-frequency characteristic.

Abstract: In a phase control loop (3, 15, 85, 87, 89, 90) for the A/D converter of a digital color television signal processing circuit an input (13) and an output (23) of a delay circuit (21) are connected to a comparator (19) to derive a control signal from the inequality of the signals at said input and output.

Abstract: A luminance peaking circuit includes a common and differential mode amplifier comprising a first differentially coupled pair of transistors coupled to a current source and functioning in a differential mode and a second differentially coupled pair of transistors functioning in a common mode. The bases of the second pair of transistors are connected together and to the base of one of the first pair of transistors. The inputs to the amplifier comprise a common mode signal and a differential mode signal and the outputs are matrixed to produce common mode signal components with opposite polarity differential mode components. The amplifier is characterized by a differential mode gain that is independent of common mode signal level and a common mode gain that is independent of differential signal level.

Abstract: A color television encoding circuit suitable for use in a color television system in accordance with the NTSC or the PAL-standard. For the purpose of readjusting both the frequency and the phase of the line oscillator the circuit comprises only one control loop incorporating a phase comparison stage for detecting the difference of the phase of the chrominance subcarrier in the chrominance signals with respect to its zero value at the instant at which the leading edge of the synchronizing pulse reaches half the amplitude thereof. The output signal of the phase comparison stage is sampled once in every 2n line periods, where n is an integer, which results in the control signal for the line oscillator.

Abstract: A method and a device for correcting a chrominance signal is arranged such that, in obtaining a carrier chrominance signal by modulating a subcarrier with an input chrominance signal, a first hue component which has a phase about plus 90.degree. relative to the phase of the subcarrier of a specific hue component of the input chrominance signal and a second hue component which has a phase about minus 90.degree. relative thereto are taken out; when the first and second hue components are sufficiently small, the carrier chrominance signal is corrected to correct the color of the specific hue component without affecting other colors.

Abstract: In a color television camera where the semiconductor array picture sensors for the three colors of a television signal have, for example, 420 points per line, so that the first order carrier frequency lies in the neighborhood of 8 MHz, corresponding picture points for the respective colors are offset by 1/3 of the picture point period for any one color. The green signal is used as a reference signal and the red and blue signals are separated into a high-frequency component and a component limited to a top frequency of 3 MHz. The higher frequency components of the red and blue signals are added to the green signal, so that the phase relations at the first order carrier frequency will tend to cancel, so that a wideband green component of greatly reduced high frequency interference and band limited red and blue components free of such interference are made available with very simple signal processing to improve the resolution of the television picture.

Abstract: In a control signal generator, a first frequency dividing circuit controllably frequency divides a television subcarrier signal to deliver a first frequency divided signal to a phase lock loop, which drives a logic circuit to produce a control signal for use in a television signal codec. Together with the first frequency divided signal, a second frequency divided signal produced by frequency dividing horizontal or vertical synchronizing signals, is supplied to a phase control circuit for phase controlling the first frequency divided signal so as to keep a phase difference which the first frequency divided signal has relative to the second one, within a prescribed tolerance. When the phase difference is smaller and not smaller than the tolerance, a switch may selectively supply the phase lock loop with the first and the second frequency divided signals, respectively, with the first frequency divided signal phase controlled to the tolerance if the phase difference is not within the tolerance.