Abstract: A digital signal processing circuit, for example, a digital signal adder circuit suitable for use in a digital color encoder for generating a digital composite color video signal from three digital primary color signals. At least two input digital signals are respectively supplied to a signal delay circuit which generates the digital signal in the form of skew bits wherein the higher bit is given a larger delay. The output signals of the signal delay circuit are supplied to an adder circuit in which the small number of bits of the digital signals are added during one clock interval. And, the output signal of the adder circuit is supplied to a further delay circuit which generates a digital signal in the form of linear bits wherein any bit in originally the same clock interval is given the same delay.

Abstract: The present invention relates to the improved demodulation system which improves the noise characteristics for the demodulation of a wideband television FM signal. An adapter for improving the ratio C/N is provided at the output of a bandpass filter (7), and the output of said adapter is applied to a discriminator (14) which demodulates the FM signal, through a limiter (13). The adapter has a variable bandpass filter (8), the center frequency and the bandwidth of which are controllable, and said variable bandpass filter (8) is inserted 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).

Abstract: A chroma signal recording and reproducing circuit of a magnetic recording and reproducing apparatus having a recording circuit for frequency-modulating a luminance signal of a color video signal, low-frequency converting a chroma signal and frequency-multiplexing those signals for recording and a reproducing circuit for frequency-converting the low-frequency converted chroma signal in a reproduced signal and frequency-demodulating the FM luminance signal to reproduce a color video signal is disclosed. The circuit comprises a chroma signal recording circuit including a first ACC circuit and a first frequency converter connected to the first ACC circuit, and a chroma signal reproducing circuit including a second ACC circuit, a second frequency converter connected to the second ACC circuit, a comb filter connected to the second frequency converter and a deemphasis circuit connected to the output of the comb filter.

Abstract: A shading correction device wherein in advance to the reading of the document image, shading correction coefficients are obtained from optic information from uniform reflecting surface and stored in a memory element such as RAM, and correcting the picture signal in accordance with the content of the memory element when the document is read.

Abstract: In this IC set, the dark currents and the white levels of the three electron guns, the leakage currents of the cathodes, and a light-detector current are measured during four successive vertical blanking intervals. The cathode leakage currents and the dark currents are measured in the first half of the vertical blanking interval, and the light-detector current and the white level currents are measured at the end of this interval. From these measured data and alignment data stored in a reprogrammable memory (ps), a microprocessor (mp) contained together with the memory (ps) in an integrated circuit (ic2) derives operating data for the picture tube (b) as well as further data.

Abstract: A high-resolution television system is described which provides twice the vertical resolution of present television standards and is compatible therewith. A high-resolution television camera substantially simultaneously provides information from each of a pair of adjacent scan lines; the luminance information of both lines is added to provide information for amplitude modulation onto a luminance carrier, while the difference in luminance of the two adjacent scan lines is utilized to modulate a carrier phased in quadrature with the luminance carrier. The chrominance values of both lines are added to modulate a chrominance carrier. The bandwidth of the resulting luminance and chrominance signals are compatible with that of a carrier modulated by a single raster line.

Abstract: A video disc player includes a phase locked loop (PLL) heterodyne converter for providing frequency translation and time base correction of the chrominance component of a composite video signal recovered when a disc is played. Residual time base errors due to the finite loop gain of the PLL are minimized by means of a phase modulator controlled by the PLL error signal. In one illustrative embodiment, the phase modulator is coupled so as to vary the phase of the translated chrominance output signal. In another embodiment, it is coupled to vary the phase of a demodulation carrier wave supplied to a chroma demodulator whereby, in either case, chroma streaking effects due to finite gain limitations of the PLL are minimized with no increase in loop gain thereby avoiding potential loop instabilities.

Abstract: A color video signal processing apparatus which utilizes a digital luminance data and first and second color difference signals which are digitized at a first sampling frequency and formed by matrix operation wherein at least one of the first or second color difference data is sampled at a second sampling frequency which comprises the first sampling frequency divided by an integer with the band width of the sample output being limited to a predetermined band width with a digital filter and the luminance and first and second color difference signals which have had their band width limited comprising the color video signal which is to be transmitted.

Abstract: A projection type green cathode ray tube (CRT) with improved brightness despite an increase in the temperature of the faceplate, a method for manufacturing a phosphor screen adopted therein, and a projection video device which utilizes the projection type green CRT. The phosphor screen of the CRT is formed of a cerium-activated calcium sulfide phosphor which contains 0.01 to 0.3 mol% of cerium. According to the method for manufacturing the phosphor screen, the cerium-activated calcium sulfide phosphor is precipitated in a 0.3 to 5% aqueous solution of water glass based on weight. The aqueous solution does not contain barium ions. The projection video device includes the green CRT, a red CRT having a phosphor screen which is formed of an europium-activated yttrium oxide phosphor, and a blue CRT having a phosphor screen which is formed of a silver-activated zinc sulfide phosphor. Brightness of images is improved and does not substantially change over time.

Abstract: Apparatus is disclosed for providing error compensation of a video information signal having a PAL format. Sampling of the analog PAL format video information signal is done at a rate of four times the chrominance subcarrier frequency and is done in a precise manner whereby the samples are taken along orthogonal vector axes that are oriented at 45.degree. relative to the U and V vector axis. When samples are taken at the prescribed locations, substitute samples in the form of multi-bit digital words can be used as replacements for defective or missing sample words, which replacement samples exhibit the same vector phase as the defective sample, but which are taken from either the preceding or succeeding line relative to the line in which the defective sample is located. The apparatus of the present invention obviates the necessity of performing any arithmetic computation to derive the value for the sample to be substituted. Moreover, the sample is spatially closely related to the defective sample, i.e.

Abstract: A colored image reading apparatus has a light source for illuminating the surface of an original, a transmitting optical system for dividing the light beam from the surface of the original into two beams of short wavelength zone and long wavelength zone and transmitting them to a light detector, a processing circuit for effecting an operation between the signals from the light detector and obtaining a plurality of electrical signals, and a converter circuit for converting the plurality of electrical signals into signals corresponding to respective colors, and is capable of well discriminating and reading four colors, black, blue, red and white, by selecting to predetermined values the wavelength .lambda.'b of the overall spectral characteristic on the short wavelength zone side including all of the spectral characteristics of the light source, the transmitting optical system and the light detector relative to the maximum value of the transmission factor and the wavelength .lambda.

Abstract: A digital television receiver includes an analog-to-digital converter having a controllable scaling factor and offset. To improve resolution of the digital samples, the scaling factor is increased and the offset is changed when the synchronizing and color reference burst portions of the composite video signal are being converted. In addition, the scaling can be greatly increased at selected times so that the phase of the color reference burst can be more accurately determined.

Abstract: A tuning system employing a UHF tuner for tuning a television receiver over the UHF band and the ultraband is disclosed. The system employs indirect frequency synthesis in providing user initiated, microcomputer generated commands to the tuner in the form of a channel number and an operating mode control word. Inter-channel spacing of 6 MHz is maintained over both tuning bands with a respective channel in one band offset from the closest channel in the other band by 2 MHz.

Abstract: A time multiplexed analog component video transmission system transmits a 2.25 MHz or integer multiple thereof reference signal. This choice simplifies a PLL at the receiver, and since it is a multiple of the horizontal frequency for 525 line and 625 line systems, a constant line-to-line phase relationship between horizontal sync and the reference signal is obtained.

Abstract: An ink usage estimator signal is developed representing the amount of ink required to print on a receptive media a portion of an image which is on film, such as a color separation. A video signal representing the portion of the selected image is gated by area pulses during periods of the video signal which define the selected portion of the image. The gated video signal is averaged to develop the ink usage estimator signal, which represents the amount of ink required to print the selected portion of the image.

Abstract: An incident light image is projected onto a CCD device through a color filter array. The color filter array is provided with a color filter row (n') with the same construction as that of a color filter row (n) corresponding to an nth horizontal scanning for interlacing purposes, which is disposed between the color filter row (n) and a (n+1)th color filter row corresponding to a (n+1)th horizontal scanning. The color filter blocks forming the color filter rows (n) and (n+1) are disposed and shifted by the half of a length (L) of each block extending in the horizontal scanning direction. All of the color filter rows forming the color filter array each have an arrangement of color filter blocks with two different color transmission characteristics alternately arranged.

Abstract: A tuning signal having a duty cycle representing a transmission frequency to be received is converted by a D/A converter to a tuning voltage which in turn is applied to a voltage variable tuning capacitance in the receiver input stage. To avoid the effects of ripple on the tuning voltage, the instantaneous d.c. level of the tuning voltage is stored on a capacitor during the tuning operation. On completion of tuning, the tuning voltage is disconnected and the stored capacitor voltage is applied to the tuning capacitance, thereby eliminating the unwanted ripple voltage. The tuning voltage produced by the D/A converter as well as that stored by the storage capacitor, are connected to the input of a voltage follower amplifier whose output is connected to the tuning capacitance. The amplifier design is such that when its input and output voltages are equal, its quiescent current is small whereas when its input and output voltages differ a current source is switched to provide a large output current.

Abstract: A color picture reading system including a correction circuit for correcting the output signal to eliminate color noise. In color picture reading systems the image of a picture element is optically separated into two or more color signals. Due to errors in the mounting position of optical sensors, color noise in the form of a color signal being erroneously present in the optical output occurs at the boundary of a color change in the picture. A correction is made by detecting the color signals resulting from the scanning of neighboring picture elements and deciding upon the correctness of a given color signal based upon the continuity of color information from the surrounding picture elements.

Abstract: In a FM luminance signal circuit of a signal reproducing circuit of a video tape recorder,(a) a reproduced signal is up-converted by an up-converter, the up-converted signal is divided into two frequency components by a surface acoustic wave filter having a first filter for peaking a high frequency component and a second filter for peaking a low frequency component, a limiter connected to the first filter, an amplifier connected to the second filter, and an adder of an output of a limiter and an output of an amplifier, and the reversal of the levels of the FM carrier signal and side band signal is prevented by above configuration.(b) A side-band glass delay line of 1H (one horizontal scan period) is provided to get 1H delayed luminance signal. Using main luminance signal and 1H delayed luminance signal, a line correlation circuit and a video dropout compensation circuit are realized.

Abstract: A camera device for electronic cinematography uses the same lens assembly for a television camera and its monitor as is used with a viewfinder eyepiece assembly, so that the scene in the viewfinder eyepiece assembly is the same as that presented to the television camera and depicted on its monitor. The light from the lens assembly may be reflected by a full mirror into only the viewfinder, or through a partial mirror to both the viewfinder and the television camera. The viewfinder and the television monitor are secured together to move as a unit.