Abstract: A television receiver having a flat braun tube as its picture tube formed of a tube portion, a funnel portion and a picture display portion in which the picture display portion is coupled integrally through the funnel portion to the tube portion, the back surface of the picture display portion being inclined such that as the back surface goes away from said tube portion, the back surface comes close to the front side of said picture display portion from an axis of said tube portion. A cabinet of substantially flat rectangular parallelepiped shape is used into which the whole of the flat braun tube and electronic circuits thereof are incorporated and a wiring circuit board having thereon at least a part of said electronic circuits is disposed in the cabinet behind the flat braun tube substantially parallel to the axis of the tube portion to define a space between the inclined back surface of the picture display portion and the wiring circuit board to incorporate therein assembly parts of relatively large size.

Abstract: The output signal of a television pickup tube is caused to appear in a carrier frequency range above the video frequency baseband without the interposition of preliminary baseband transmission. This is done by modulation at carrier frequency by any of a variety of methods that chops or modulates the signal as it is formed, at a frequency which should be in the neighborhood of 16 MHz for a video bandwidth of 5 MHz. The modulation may be done by breaking up the picture on the pickup electrode by an optical grid or similarly interposing a grid which interrupts the scanning beam that scans the electrode, in which cases the modulating frequency is related to the scanning rate. Electronic modulation of the beam can also be applied to a suitable part of the electron gun structure or to a special modulating control electrode.

Abstract: A ghost canceller includes a ghost canceling circuit having a transversal filter for receiving a television input signal and a tap gain holding circuit for holding tap gains of the filter, a ghost detector, and a means for writing tap gain data into the tap gain data holding circuit in response to the ghost detector to permit a ghost component in an output signal of the ghost canceling circuit to be canceled out. In order to prevent the disturbance of a TV screen due to a transient response which occurs upon writing tap gain data into the tap gain data holding circuit, an output means is provided for permitting a signal other than the output signal of the ghost canceling circuit to be selectively taken out during a first time period including an interval in which tap gain data is written into the tap gain holding circuit and for permitting an output signal of the ghost canceling circuit to be selectively taken out during a second time period other than the first time period.

Abstract: In a picture image display apparatus including a large number of display elements which are lighted by digitalized level adjusted light data produced by a video signal, the digitalized level adjusted light data are corrected by the difference between a mean quantity of light and the light quantity of each luminous element so as to light the luminous element during an interval corresponding to the level adjusted light data without using any light quantity adjusting circuit.

Abstract: Noise in a composite video signal is detected by looking for the presence of excessive pulses resembling broad pulses or insufficient horizontal sync pulses. The output of the detector is averaged by a low pass filter, the output of which is, in turn, applied to a comparator for comparison with a reference DC level in generating a signal representing the noise level in the composite video signal.

Abstract: A projection television receiver having a more compact cabinet size due to an improved projection lens system. The projection lens system includes a plano-concave lens and a plano-convex lens having optical axes forming an angle in a range of 170.degree. to 190.degree.. First and second mirrors are positioned rearwardly of the plano-concave mirror and the plano-convex mirror to reflect light rays from the plano-concave mirror parallel to the optical axis of the plano-convex mirror. A convex lens is positioned between the two mirrors and the optical path between the plano-concave mirror and the plano-convex mirror.

Abstract: A projection-type television system includes apparatus for providing frequency selective compression of video signals. Low frequency video signal components representative of white image information above a threshold level are subjected to relatively greater compression compared to high frequency video signal components representative of white image information.

Abstract: A hybrid TV frequency modulation feedback loop (FMFB) remote volume control includes an RF input and an intercarrier audio detector circuit connected thereto to provide a baseband audio signal. An amplitude control is provided for the audio signal. There are means for using the video carrier at the RF input to provide a signal representative of common mode spurious deviation (CMSD). There are circuit means for combining the common mode spurious deviation signal the amplitude controlled baseband audio signal, from the intercarrier audio detector and for providing an aural carrier signal having common mode spurious deviation and amplitude controlled audio.

Abstract: A digital peaking circuit for processing digital luminance signal in a video processing system combines parallel paths of delay elements and summing circuits to produce the desired luminance response curve with minimum hardware. Only one scaling circuit is required to achieve the desired frequency response characteristic and one multiplier is included to render the peaking circuit adaptive.

Abstract: Method and device by which, at a given instant, a conductor (4) at the output of a capacitor (5) carrying a video signal is connected to a reference voltage source (1, 2). The use of a voltage source (1, 2) whose impedance depends on the direction of the current which it supplies, makes it possible to connect the conductor (4) to the voltage source (1, 2) during the whole duration of a line flyback, instead of being obliged to use a special pulse occurring solely at the end of the line flyback time. In the case of positive white, for example, a positive current supply part of the voltage source (2) having a high impedance sends a positive supply current to the conductor (4) carrying the video signal, and a low-impedance negative current supply part (1) connects this conductor to ground.

Abstract: An improved image processing method prevents unwanted processing artifacts from degrading the reproduction of an image by stressing the interrelationship of various image gradients in the image. Image signals are generated representative of the light value of elements of the image. A local gradient signal is generated in response to a combination of image signals representative of an image gradient over a local portion of the image. An extended gradient signal is also generated representative of an image gradient over an image portion greater than the local portion. The image gradients are interrelated in a composite signal generated from a combination of the local and extended gradient signals. As an example of the combination, the composite signal is made to vary as a function of the difference between the gradient signals. The image signals are then modified subject to a characteristic of the composite signal, e.g., the magnitude of the composite signal.

Abstract: A wide-angle television system, such as one having 2:1 or 5:3 aspect ratios, provides N portions that exceed the limits of a conventional 4:3 aspect ratio picture in regions that are normally hidden from view in a conventional receiver. Further, a receiver is provided wherein the picture is changed from the wide-angle display to the standard display by collapsing the horizontal scanning only. In another arrangement standard definition kinescopes having aspect ratios of 4:3 are masked in a special manner to provide a 5:3 aspect ratio display which may be collapsed to provide a 4:3 standard aspect ratio pictures.

Abstract: An improved image processing method reduces noise in a sampled image while minimizing unintended distortion of image features. Image signals are generated representative of the light value of elements of the image. These signals are formed into signal arrays aligned to blocks of image elements. The signal arrays are transformed by a set of 4 by 4 Walsh-Hadamard functions into a corresponding set of coefficient signals. Certain of these coefficient signals represent the difference between the light value of each image element and an average light value over an image region smaller than the block being transformed. By modifying--i.e., coring or clipping--and inverting only these selected coefficient signals, artifacts related to the introduction of "false" edge-like structure are reduced in the reconstructed image. In addition, in a multi-stage processing method, the excluded coefficient signals may represent the input signals to the next stage.

Abstract: A television bandwidth correcting system for use with a television receiver or television tuner in which the quality of the displayed picture, defined by the bandwidth of the video signal, is accurately maintained for all input signal levels. Video and audio components are extracted from the intermediate frequency signal produced at the output of a bandwidth adjusting circuit. The levels of the extracted video and audio components are compared, and the result fed back to a bandwidth controlling input of the bandwidth adjusting circuit.

Abstract: An improved image processing method uses a modified Walsh-Hadamard transform to remove noise and preserve image structure in a sampled image. Image signals representative of the light value of elements of the image are grouped into signal arrays corresponding to blocks of image elements. These signals are mapped into larger signal arrays such that one or more image signals appear two or more times in each larger array. The larger arrays are transformed by Walsh-Hadamard combinations characteristic of the larger array into sets of coefficient signals. Noise is reduced by modifying--i.e., coring or clipping--and inverting selected coefficient signals so as to recover processed signals--less noise--representative of each smaller signal array. The results exhibit acceptable rendition of low contrast detail while at the same time reducing certain processing artifacts characteristic of the unimproved Walsh-Hadamard block transform.

Abstract: An improved movement detector (8) for a television noise reduction system interposes a recursive filter (12) between the absolute value circuit (9) which signalizes the magnitude difference between delayed and undelayed television signals and the function generator (11) which forms the correction factor k which controls the degree of noise reduction. Especially for filtering changes in the vertical direction and the recursive filter involves a considerable saving in equipment.

Abstract: In a focusing voltage output circuit for a cathode ray tube, a variable impedance circuit is connected in series with a variable resistor for adjustment of focusing voltage. The impedance of the variable impedance circuit is changed in response to a video luminance signal or a beam current to change the focusing voltage so as to optimize the focus tracking characteristic.

Abstract: A high voltage generator in a television receiver responds to horizontal deflection rate signals from a horizontal oscillator which normally responds to a horizontal sync signal derived from the television signal. A sync validity detector provides a control signal indicative of the validity of the horizontal sync signal to an electronic tuning system in order to identify active channels, and to the deflection system to inhibit the response of the deflection system to false sync signals otherwise capable of causing the oscillator to operate a lower frequency likely to cause the high voltage generator to develop an excessively high voltage.

Abstract: A video sync validity detector comprises a peak detector circuit and an average detector circuit both responsive to output signals from a sync separator network. Sync representative signals are provided from the output of the peak detector. The average detector is coupled to the peak detector for inhibiting sync representative outputs therefrom in the presence of sync separator output signals representative of false sync signals of average value.

Abstract: A deghosting system incorporated in a digital television signal processing system includes a number of channels for producing digital samples of psuedo ghost signals for cancelling digital samples of respective ghost components of a contaminated video signal. Each channel includes a random access memory into which digital video samples are read and later read out of at a time corresponding to the delay between the respective ghost component and the main (desired) component of the ghost contaminated video signal. The resulting delayed digital samples are multiplied with an appropriate coefficient to generate the digital samples of the psuedo ghost signal.