Abstract: This invention relates to the production of a printing block or form of the kind in which at least one original is scanned optoelectronically to obtain image signals being mixed to generate a composite signal and is recorded as the printing block or form, one of the image signal which is to be mixed being modulated by a control signal and the other image signal being modulated by the amplitude-inverted control signal and the modulated image signals being summated to obtain said desired composite signal, said control signal determining a mixing range and the mixing characteristic within said mixing range.According to the invention, the said control signal is derived from the color information of a colored control mask by scanning said mask or from the image content of the original.

Abstract: A color filter for a single image pickup device camera features using color filter elements that have one dimension that is less than the corresponding dimension of photosensors in pickup device. This results in a wider bandwidth signal.

Abstract: An arrangement for optoelectrically scanning a master employs a scanning device having a plurality of scanning elements which simultaneously scan a plurality of parallel lines of a row, the master being displaced at right angles to the scanning direction. The scanning device, like a mosaic printing head, is disposed on a printing carriage of a printing station which moves along a platen and the master to be scanned can be placed around the platen which displaces the master as scanning takes place. In one embodiment the scanning device includes scanning elements which are disposed like the printing elements of a mosaic printing head and the scanned points communicate with the scanning elements through light tunnels, which tunnels may include light guides. In another embodiment, the scanning device includes a lens which focuses the scan points on the scanning elements.

Abstract: A network is provided for attenuating the adjacent channel sound carrier signal in a television receiver. First and second trap circuits are serially coupled intermediate the R.F. mixer and the first I.F. amplifier. One of the trap circuits is tuned to a frequency in the vicinity of and above the nominal frequency of the adjacent channel sound carrier, and the other is tuned to a frequency in the vicinity of and below that of the adjacent channel sound carrier. The two trap circuits are mutually coupled to a degree necessary to produce a composite response curve exhibiting a substantially constant level of maximum attenuation in the vicinity of the nominal frequency location of the adjacent channel sound carrier. The trap circuits provide attenuation in excess of that required to eliminate adjacent channel sound carrier interference over a bandwidth sufficient to encompass expected carrier deviation due to frequency modulation, carrier mislocation, and trap mistuning.

Abstract: In a beam index color television receiver of the type having a cathode ray tube which is provided with beam-excitable color elements disposed on a display screen of the cathode ray tube and index elements which are scanned by an electron beam as the beam scans the display screen, an apparatus for controlling the beam includes an index signal generator for generating a periodic index signal as the index elements are scanned by the beam, color gates which sequentially gate respective color control signals individually to modulate the electron beam as the beam scans the color elements, a gating signal circuit which generates sequential gating signals at a frequency synchronized with the frequency of the periodic index signal and which supplies the gating signals in sequence to the color gates to control the latter so as to gate the respective color control signals, and a phase-controlling circuit for controlling the phase of the gate pulse signals in response to the highest-level one of the color control signals

Abstract: In a beam index color television receiver having the screen of its color cathode ray tube provided with a repetitive pattern of a plurality of groups of different primary color phosphor elements arranged side-by-side across the image area of the screen to be scanned by a single electron beam as the latter is selectively modulated by respective color signals, index and mode set signals are provided in response to scanning by the beam of respective locations on the screen which are interspersed across the latter with distances therebetween which are non-integrally different from the pitch of the groups of color phosphor elements, and with adjacent locations corresponding to the mode set signal being spaced apart by an integral multiple of such pitch.

Abstract: In order to increase the sensitivity of television cameras so as to allow the cameras to operate in low level light, an image transformer attachment, in the form of an ancillary image intensifier, is provided for attachment to the objective lens opening of the camera. The attachment includes a cylindrical housing containing one or more proximity-focus image converters or intensifiers which are optically connected to the pick-up tube of the camera by a fiber optics cylindrical block. The housing includes an annular disk screwed into its input end, which disk has an opening for the objective lens of the camera and which disk urges a resilient ring against the image transformers to bias the intensifier and fiber optics block against the pick-up tube of the camera.

Abstract: An automatic kinescope beam current limiter for a television receiver comprises a source of signal representative of kinescope beam current conduction, a first transistor responsive to the representative signal over first, second and third ranges of excessive beam currents above a threshold level, and a second transistor. A first control signal derived from the first transistor modifies the video signal peak-to-peak amplitude (contrast level) when beam currents above the threshold level occur. The output of the first transistor is selectively coupled to an input of the second transistor when beam currents beyond the first range occur. A second control signal derived from the second transistor modifies the video signal D.C. component (brightness level) to limit beam currents beyond the first range, whereby both the peak amplitude and D.C. components are modified over the second range.

Abstract: A synchronizing signal for a television camera includes a count-down system by which standard horizontal and vertical synchronizing signals are generated and added to the video signals being produced. In order to allow the camera to be synchronized to a nonstandard source of synchronizing signals such as a television game, computer with TV display, another television camera or a video recorder for allowing split-screen applications, the count-down system is phase-locked to the external sync portions of the external sync signals. Thus, standard sync signals are produced by the camera at a rate controlled by a nonstandard sync source. In order to prevent slewing of the system during the vertical equalizing or synchronizing portions of the external sync signals, the phase-lock loop which controls the frequency of the count-down system is inhibited during at least the vertical synchronizing and equalizing pulse portions of the external synchronizing signals.

Abstract: A control network and method for a color television receiver is described for enabling and disabling the limiting action of a conventional ACL (Automatic Color Limiter) circuit, for varying the threshold at which a color killer circuit inhibits reproduction of color images, or for effecting both functions simultaneously. In the preferred embodiment, the control network includes a two-position switch by which the viewer can either increase or decrease the value of a reference signal to thereby control the degree of amplification of a received color signal. An amplifier is responsive to a reduction in the amplitude of the reference signal for substantially disabling the limiting action of the ACL circuit and for causing the color killer to inhibit reproduction of color images when a relatively small amplitude color signal is received.

Abstract: A television camera adjustment by means of a monitor picture is effected by forming a window area therein by means of which the camera operator directs the camera to a scene, the window area lines being used as an indication that an optimal adjustment has been achieved or as an indication for the operator that he must perform an adjustment procedure into one or into the other direction because it is not possible to obtain the optimal situation by means of surpassing a control range. With a color television camera the procedure can be used for a white balance adjustment combined in an advantageous manner with a black level adjustment.

Abstract: A controlled oscillator comprises an amplifier including an active device, a filter network arranged in a feedback loop of the amplifier for providing regenerative feedback to sustain oscillation of the amplifier, and a source of control signals. Output oscillatory signals from the amplifier and output control signals from the control source are summed by a combining network to produce a resultant controlled signal, which is coupled to the filter network. Parasitic capacitances associated with output terminals of the amplifier and control source impart an unwanted phase shift to the controlled signal. A compensation signal derived from the oscillator is supplied to the combining network with a magnitude and phase to offset the unwanted phase shift, to thereby produce a phase compensated resultant controlled signal.

Abstract: In a color decoder for a color television receiver, including a demodulator for demodulating a modulated chrominance subcarrier to obtain color signals, delay lines in the form of a charge storage and transfer circuit for delaying the color signals by one picture line scanning period, and adder stages forming a matrix connected to produce color difference signals from the delayed and the undelayed color signals, the demodulator and the adder stages are constituted by integrated charge storage and transfer circuits on a semiconductor chip.

Abstract: In a pre-amplifier for use in a three electrode single tube type color television type, color signals delivered from respective electrodes are processed by output signal processing circuits. Each output signal processing circuit comprises a high input impedance amplifier provided with a feedback circuit. A variable resistor is connected in the feedback circuit for adjusting the gain of the amplifier.

Abstract: A solid-state color imaging device is provided including a plurality of photosensors which are arrayed in horizontal and vertical directions, and a mosaic color filter made up of filter elements arranged in correspondence with the respective photosensors. The mosaic color filter is arranged such that any group of four adjacent filter elements comprises a first filter which is made for panchromatic transmission, a second filter which is selected from among a first spectral region-transmitting filter, a second spectral region-transmitting filter and a third spectral region-transmitting filter respectively exhibiting different transmission characteristics, and third and fourth filters which are made of complementary color filters which transmit the transmission light component of the second filter and which have transmission components different from each other.

Abstract: A color video projector as disclosed which includes a cabinet having a depressed top deck, and a mirror carrying L-shape mounting board pivotally carried by a pair of slidably movable arms, guide grooves on the side edges of said top deck and guide pins protruding from the mounting board ride in the guide grooves during withdrawal of the mounting board. The board can only be rocked to its upright position when the arms are fully extended and can only be rocked back to its original position when the arms are fully extended and from which position the mounting board can be pushed back into the cabinet with the mirror above the top deck.

Abstract: A demodulator for binary messages of the diphase type comprises a sampling circuit controlled by a local clock whose cycle is approximately 1/n.sup.th of the bit length of the incoming signals (with n=8 in a specific instance), this circuit deriving (n-2) samples from each message bit which are then analyzed in a programmed memory to determine whether the bit being sampled has one of six acceptable configurations, namely a bit of logical value "0" or "1" in either a normal, a leading or a lagging position with reference to a decoding interval T equaling n clock cycles. If a different configuration is detected, an error signal is generated. The decoding interval is measured by a counter, stepped by the local clock, which is adjusted by recalibrating commands from the programmed memory to shorten or lengthen the next decoding interval when a bit is found to lead or lag by a full clock cycle, thereby restoring the normal relative time position of the message bits and the decoding interval.

Abstract: A composite video signal is coupled to the input of a tapped delay line of a vertical sync separator. A detector determines the presence of the vertical sync signal profile within the sampled portion of the composite video. An output signal is produced by the separator when the appropriate vertical sync profile is thus detected.

Abstract: An improved method and system for separating chrominance and luminance information in a quadrature modulated color television signal and similar periodic signals is disclosed. A comb filter selectively separates chrominance and luminance components from the video signal and provides a combed chrominance output and an adaptively combed luminance output. A low frequency luminance vertical transition detector is connected to an input and detects vertical amplitude transitions occurring at adjacent horizontal scanning lines and produces a first switching signal independent of the direction of a particular transition. A second transition detector detects the simultaneous occurrence of transitions in chrominance and high frequency luminance in either direction above predetermined minimum threshold values to provide a second switching signal.

Abstract: A television receiver is disclosed, which receives two television signals and compresses a time axis of one of the television signals and inserts the compressed signal to a portion of the other television signal to display both signals on the same screen. A signal indicating a boundary of the two images is produced from a synchronizing signal derived from one of the two received television signals and the boundary indicating signal is superimposed on one or both of a brightness signal and a chrominance signal to display the boundary.