Abstract: A wide aspect ratio screen color television system, such as a 16:9 aspect ratio screen television system, includes a signal generating circuit for generating the wide aspect ratio screen color television signal with a predetermined two-dimensional frequency band, a screen separating circuit for separating the color television signal into at least a first television signal relating to a relatively narrow aspect ratio portion and second television signal relating to an excess portion thereover, a circuit for eliminating a prescribed high frequency region of the two-dimensional frequency band of the first television signal, a signal suppressing circuit for suppressing the frequency band of the second television signal and a signal multiplexing circuit for multiplexing the suppressed second television signal onto the two-dimensional high frequency band region in place of the eliminated portion of the first television signal.

Abstract: A method for encoding and transmitting video signals, the method including separating the video signals into consecutive base intervals, each base interval having a predetermined time duration; time delaying every other one of the base intervals for the predetermined time duration whereby consecutive pairs of the base intervals are available in parallel; time expanding by a factor of two each of the consecutive pairs of base intervals thereby reducing the bandwidth of the intervals by one-half; and amplitude modulating in quadrature the base intervals in the time expanded consecutive pairs of base intervals onto a carrier frequency located in a transmission band.

Abstract: A television signal processing system includes a source of video images for providing luminance and chrominance components of the video images by generating and putting out scan lines. The source includes a low level horizontal domain detail processor connected for boosting low level horizontal transitions of the luminance component put out by the source below a predetermined threshold level. The system typically includes a signal-degrading path such as one characteristic of transmission or recording. The signal is passed through the degrading path to a display unit. A line doubler is preferably, although not necessarily, included in the display unit for doubling the number of decoded scan lines of the signal and for putting out scan line doubled luminance and chrominance components. A display image processor is connected to the line doubler and provides horizontal domain transition high level enhancement for enhancing horizontal domain transitions having amplitudes above the predetermined threshold level.

Abstract: Disclosed herein is a method for processing a first picture to be reproduced on a color picture tube. The value e.sub.ys of luminance signal for a shadow S of a second picture, which has been obtained from a preceding scanning operation, is subtracted from the value e.sub.y of luminance signal for a desired pixel P out of video signals received, thereby determining the value e.sub.p of a base luminance signal. Luminance signal values e.sub.s and e.sub.h are set respectively for a shadow S and a highlight H among pixels of the first picture to be reproduced on the color picture tube. The value e.sub.q of a luminance signal for a pixel Q, which corresponds to the pixel P and is to be reproduced, is determined from the signal values e.sub.p, e.sub.s and e.sub.h in accordance with a particular correction formula. The luminance of each pixel, which is to be reproduced on the color picture tube, is adjusted in accordance with the value e.sub.q of the corresponding luminance signal thus determined.

Abstract: A video interface circuit for displaying the output of a video camera on a video monitor of the type used for displaying computer output data. In a first mode of operation, data from a video camera is stored in a first video memory while data previously stored in a second video memory is displayed on a video monitor. In a second mode of operation, there is provided the further steps of displaying information previously stored in the first and second video memories alternately on the video monitor. In a third mode of operation, data previously stored in the first and second video memories is read out one word at a time. If a predetermined bit in the word read from the second video memory has a first predetermined logical level, the word read from the first video memory is displayed on the video monitor. Alternately, if the predetermined bit in the word read from the second video memory has a second predetermined level, the word read from the second video memory is displayed on the video monitor.

Abstract: A color enhancement circuit according to the present invention extracts "sine-squared" (haversine) pulses representing absolute values for the derivatives of R-Y and B-Y color difference "sine-squared" transitions; multiples by offset, sign-inverted luminance, and adds the luminance-weighted "singe-squared" pulses to the composite video as color enhancement signals which exceed the NTSC-legal chroma bandwidth but are within the NTSC-legal luminance bandwidth. The pulses augment luminance during chroma transitions, restoring luminance contributions from chrominance which are lost when chroma subcarrier packet risetimes and bandwidth are limited by NTSC broadcast requirements.

Abstract: A teletext decoder comprises a main memory (M2) which includes a raw data buffer (RDB) in rows RD0 to RDn of which teletext data packets and non-teletext "junk" data packets are stored in the order in which they are received, and a reformatting buffer (RB) to rows R0 to R31 of which the data packets stored in the RDB memory are transferred, the data packets in the RB memory being stored in a given numeral sequence. Each of the rows R0 to R31 of the buffer (RB) has a status buffer (SB) byte B0 to B31 respectively, associated with it for indicating whether the corresponding data packet has been received out of its correct given numerical sequence, and thereby being a possible non-teletext "junk" data packet which may be subsequently overwritten by a valid data packet.

Abstract: A circuit for ensuring that the level of the front porch of each line in a color video signal is at a predetermined proper level includes a circuit for detecting the position of the horizontal synchronization pulse in each line, a circuit for generating an artificial front porch signal, and a controllable switch connected to receive the color video signal and the artificial front porch signal. The controllable switch, under the control of the detecting circuit, provides a signal for a subsequent color decoder circuit in which the front porch in each line in the color video signal is replaced by the artificial front porch signal.

Abstract: A television encoder for generating a receiver-compatible signal from a production video signal containing enhancement information which cannot be displayed on a standard receiver, the receiver-compatible signal being compatible with the standard receiver, the encoder including a filter bank for dividing the video signal into at least two groups of spatial frequency components including a first group and a second group, the first group containing members which when combined together form a standard video signal which is displayed by the standard receiver and the second group containing the enhancement information; a quantizer for quantizing at least one member of the first group; a combiner for adding at least one member of the second group to a quantized member of the first group to produce a modified first group; and a synthesizer for combining the members of the modified first group to generate the receiver-compatible signal.

Abstract: In a digital video signal processing device, a digital filter two-dimensionally limits the bandwidth of a digital video signal which is obtained by time-base multiplexing a digital luminance signal with a digital chrominance signal for each horizontal scanning line, and the signal which has been band-limited by the digital filter is offset-subsampled.

Abstract: A character multiplex broadcasting receiving apparatus is provided for reducing and displaying a plurality of character figure images including header information and text information. In the invention, to simultaneously display a plurality of character figure images, division signals are formed from a horizontal pulse, a vertical pulse, and a clock pulse (chrominance subcarrier frequency f.sub.sc .times.4) to designate areas on the CRT. Either and animation image (television image) or a character image to display character figure information is designated for each divided picture plane and a plurality of character figure images are simultaneously displayed.

Abstract: A video display device comprising a display panel which has a large number of luminescent display cells arranged in an X-Y matrix and with a common drive circuit for applying an input video signal which substantially reduces the number of drive circuits by at least a factor of two and wherein a switching circuit switches the input video signal from a first plurality of luminescent display cells to adjacent luminescent display cells at every field period of the input video signal so as to reduce at least by one half the number of drive units required in the display device.

Abstract: An enhanced definition PAL signal (HD-PAL) may be received by a MAC receiver by decoding the signal received with a simple PAL decoder (10), time compressing the luminance and chrominance components of the decoded signal and encoding them in a MAC format (12). The MAC signal is then decoded using an HD-MAC decoder (14) and the signals are expanded by a post processor (16) prior to display.

Abstract: Apparatus and methods for remodulating digital luminance and color difference components for display as PIP information, or together with other composite video components for multi-PIP and test pattern applications are disclosed. A digital encoder is used for conducting a digital quadrature modulation on the color difference components and for digitally adding the luminance signal thereto prior to the converting of the remodulated information into an analog format. Preferably, the digital video information output by the encoder is in the form Y1+(R-Y)1, Y1 +(B-Y)1, Y2-(R-Y)1, Y2-(B-Y)1, Y3+(R-Y)2. Y3+(b-Y)2, Y4 -(R-Y)2, . . . , where Y is the luminance component, R-Y and B-Y are color difference components, and where the numbers index received samples of the video components with the luminance component being sampled at twice the frequency of the color difference components.

Abstract: Synchronizing information is obtained from a digital video signal by supplying the digital video signal to a first digital function genenator which recognizes that the beginning and end of the horizontal blanking interval the preamble of a timing reference signal that precedes the synchronizing word that concludes the timing reference signal. This function generator is clocked at the data word rate of the digital video signal. If the preamble is correctly received the function generator provides at its output register the synchronizing information provided in the corresponding bits of the synchronizing word, and also a signal designating that a valid synchronizing word has just been received. A programmable logic circuit converts this synchronizing information into synchronizing signals and also provides by means of two-bit counter sub-multiple clock signals.

Abstract: In case teletext data superimposed on a television broadcast signal are to be displayed as an auxiliary picture on a main picture on which a television video signal is displayed, the teletext data must be compressed. If the logical outputs of two pixels themselves adjacent in the horizontal direction are made data after the compression as this compressing method, depending on the contents of the teletext data, the data after the compression will not reproduce the original information in some case. In this invention, the teletext data are divided into blocks of a predetermined size and the "dense" and "rare" densities of the respective blocks are judged. The optimum compressing method losing no information is selected in response to this judging result.

Abstract: An auxiliary signal including a burst of oscillations and a blacker-than-black horizontal synchronizing signal is inserted in the horizontal blanking intervals of an HDTV video signal by first generating a digital auxiliary signal in a PROM operating at a clock frequency of 27 MHz. If the video signal from which the clock frequency and other control signals are derived is an analog video signal, the digital auxiliary signal is converted to an analog signal, filtered and clamped before it is additively combined with the analog video signal which has been similarly clamped. In that case the digital auxiliary signal stored in the PROM is predistorted so as to compensate for the damping effects of digital-to-analog conversion and low-pass filtering.

Abstract: A composite video signal each line of which comprises a line synchronizing pulse, a front and a back porch and a vision portion, the synchronizing pulse of which may contain a burst of pulsed additional information is applied to an input terminal (1) which is connected to the input of a first signal path (T1, T2) whose output is connected to a current source (I1) and to an output terminal (8). A second signal path (T3, T4) has its input connected to a reference voltage input (5) and its output connected to the current source (I1) and the output terminal (8). A switching circuit (T5, T6) alternately enables the first and second signal paths (T1, T2; T3, T4) under the control of a switching signal at a connection (10) such that the output terminal (8) produces a composite video signal in which the synchronizing pulse at the input terminal is replaced by a pulse or level. The replacement does not contain the burst of pulsed additional information when present in the applied signal.

Abstract: A system for transmitting and receiving a high definition television signal with characteristics which are determined in part at the receiver. The system transmits an AM signal formed by frequency multiplexing a number of components derived using an HDMAC-60 encoder.

Abstract: An image processing apparatus generates an after-image effect by using a first memory in which one field of digital composite video signal selected from every 4 fields is stored successively and a second memory in which one field of the digital composite video signal which is the same as any one field of the field group stored in the first memory is stored successively, and combining the field outputted from the first memory and the field output from the second memory together. An image processing method according to the invention includes the steps of dividing a picture into a plurality of regions, writing image data of each point of the plurality of regions into each corresponding memory locations of a memory only during periods selected, for each of the plurality of regions, from periods of the cycle of four fields.