Abstract: In a method of encoding a television signal having a video signal, the method comprising producing an encoded television signal in accordance with a motion-compensated processing of the video signal, determining vectors in a first picture period of two consecutive picture periods of the video signal, and, in a second picture period of the said two consecutive picture periods, determining pointers to the vectors determined in the first picture period, a substitute pointer pointing to a vector which is indeed to be transmitted is searched if a pointer thus determined does not point to a vector to be transmitted, so that a television signal encoding with an improved picture quality can be obtained.

Abstract: A high definition image transmission system comprising a stage for the transmission of encoded data representative of images and, after transmission of these data at a specific field frequency and by a first channel having a limited passband, a stage for receiving the transmitted data. The transmission stage comprises an image encoding device having three processing channels in parallel for the purpose of transmission, at three separate transmission rates, of one or another of these three channels depending on the output signal of a decision circuit. It further comprises a device for decoding the encoded data, comprising three processing branches located in parallel and each receiving the sequence of the encoded data and a circuit for routing the outputs of the said branches according to the output signal of the decision circuit transmitted to the decoding device by a second channel called the digital assistance channel.

Abstract: A multiple coupler which comprises a low-pass path (VPB) and a high-pass path (VPH) and frequency separation elements comprising a capacitive element C and an inductive element L, whose impedances Z.sub.c and Z.sub.l, respectively, satisfy the relation Z.sub.c Z.sub.l =Z.sub.o.sup.2. The low-pass path comprises a phase inverter INV to enable recombination of the signals without any distortion.

Abstract: An improved color subcarrier and amplitude reference signal and means for its utilization are provided for color television systems, particularly high definition, wide aspect ratio television systems wherein the high definition signal is decomposed into two signals for transmission via two separate channels and recombined at the receiver to reproduce the original high definition image.

Abstract: A system (1) for reproducing picture signals from a record carrier (3) in the form of a tape on which the reproduced picture signals are stored in juxtaposed inclined tracks comprises a character generator (23) for inserting character signals into reproduced picture signals. The character generator (23) is enabled to insert character signals depending on a starting-pulse edge (S1 S2, S3) generated by means of a control device (25), which edge is generated at a time interval from a position-pulse edge (P1, P2, P3) which is each time generated by means of a pulse generating device (11) at the beginning of the scan of an inclined track.

Abstract: This arrangement has an input (10) for receiving the information to be encoded in the form of fixed words comprising a number of bits, a first transcoding member (20) for applying said variable word to "n" outputs among n parallel outputs, a second transcoding member (22) for supplying from its output the indication of the length (n), and an accumulation member (30) for forming a first "modulo N" accumulated information and a second "modulo 2N" accumulated information, which are the result of operations performed on "n".

Abstract: A picture signal source (PSS) comprises an encoding circuit (ENC) for encoding a picture signal having a higher bandwidth to a picture signal having a lower bandwidth. Encoding is effected in dependence upon the extent of motion in the picture which is determined by a motion detection device (MOT). An encoding has been given as an example, using several picture signal channels (PC1, PC2, PC3) each having a different picture signal refreshing period of, for example 80, 20 or 40 ms. The so-called field skipping method is used for which a switching circuit (SC4) switching at the frame frequency is provided. The picture display device (PDD) comprises an essentially complementary, inversely operative decoding circuit (DEC) with a motion-compensated (VR') picture signal interpolation circuit (MEM, INT, G) which comprises a gamma compensation circuit (G) according to the invention. Without this circuit a troublesome area flickering may occur upon display in practice.

Abstract: An arrangement for encoding two dimensional information grouped in periodical information clusters, the arrangement being comprised of a variable length encoding stage, reconstruction stage, a movement estimating stage and the prediction stage. The movement estimation stage is adapted to supply from the input signals, movement information related to the movement between input signals of the same row or of opposite rows. The reconstruction stage provides a path for additional processing of the signals when the input signals provide additional information components.

Abstract: The arrangement has an input (10) to receive a sequence of source pictures, a motion determining circuit (20) to supply a first motion vectors for all the elements of the pictures of the sequence to be processed, a coherence circuit (21) to supply a validation signal (KF) of the first motion vector, and a selection circuit (25), which is controlled by the coherence circuit, to supply a definitive motion vector on the basis of said first motion vector and at least one alternative motion vector. The coherence circuit comprises a first portion (30), to supply a first coherence signal (KS) related to a picture element, from, at least, motion vectors assigned to elements surrounding said picture element, and a second portion (32) to supply a second coherence signal from first coherence signals assigned to elements, corresponding to said element of a plurality of pictures of the sequence to be processed.

Abstract: A data processor system having at least one arithmetic/logic processor element and at least one memory processor element which can be coupled in circuit using a crossbar switch. The arithmetic/logic processor element is provided with an ALU and a program memory. The ALU has an input for instructions. The instructions can be made up of data from the program memory and data from the crossbar switch via a channel specifically present for the purpose.

Abstract: A system is described for transmitting two conventional television signals (for example NTSC style 525 line, 2:1 interlaced signals) over a two line MAC (multiple analog component) signal. Both an encoder and a decoder and a method for use in conjunction therewith are described.

Abstract: A method and apparatus for generating a multi-carrier high-definition television (HDTV) signal including a digital sound and sync (DSS) component, on a conventional television channel, for example, 6 Hz. MAC derived signal components are quadrature modulated on a plurality of subcarriers and combined in frequency multiplexed form to create an RF signal.

Abstract: The converter comprises a pick-up device (PD) for picking up a negative (PH), a picture signal processing circuit (PC) for obtaining a picture signal via a signal inversion (IN) and fixing at a black level and a white level, which signal is suitable for display on a television display screen (TVD), and a time signal generator (TG) for supplying at least one adjusting signal (WS) to a black level adjusting circuit (BA). To realize a simple adjustment, the negative (PH) can be picked up by a sensor (FT) in the converter with a picture content part (PP) and beyond it a bright part (WP) by way of a sequential or simultaneous pick-up, respectively, while the sensor (FT) has a black level reference member (BR). Essential is the use of the adjusting gate signal (WS) for the black level adjusting circuit (BA) when the said bright part (WP) is being picked up.

Abstract: A transversal filter has more delay elements than adjustable multipliers, and a switching arrangement for supplying each multiplier with the signal from a selected one of a group of the elements. Each element is a member of one of the groups. The outputs of the multipliers are added, and their sum is used to control optimization of the multiplier weights for a given set of switched connections. Successive sets of connections are established to develop sets of optimized weights, until each delay element output has been used. A globally optimized set of connections and weights is then used for processing information.

Abstract: A method and apparatus for shortening the transition times in a video signal while at the same time reducing incidental noise present during the non-transition portions of the video signal. An adjustable sharpness signal is provided which is modulated by a waveform derived from the video signal. This modulated signal is used to provide a boost to the sharpness signal during transition portions of the video signal. An adjustable noise reduction signal may also be provided to adjust the amplitude response of the non-transition portions of the signal.

Abstract: A test signal is transmitted over a communication channel and the signal is received by a receiver. The temporal evolution of the test signal is represented in a matrix and the inverse of the test signal evolution matrix is stored in the receiver. Samples of the received signal and the test signal evolution matrix inverse are used to compute the channel impulse response, and the values of the channel impulse response set signal restoration filter coefficient values. The received signal is then restored by filtering.

Abstract: Television picture transmission stage in which besides means for transmitting at least one picture characteristic extension video signal via at least one transmission path, means for scrambling at least a part of said extension signal or signals, and receiving stage comprising corresponding receiving and descrambling means. These stages are particularly intended for a television picture transmission system in which one or more video signals for extending the aspect ratio of the picture and the video signals for extending the horizontal and vertical definition of the said pictures are transmitted and transferred superposed on the conventional video signals which correspond to the original pictures, said extension signals having been submitted before transmission to a cyclic permutation from a cut point defined for each line with the aid of a pseudorandom sequence generator.

Abstract: A serial memory in which serial address input devices share a terminal with control signal input devices is suitable for the non-shifting storage of information and includes at least one address counter which receives address incrementation signals from a clock and which is suitable for receiving a preset address on the serial address input means.

Abstract: An adaptive ghost cancellation circuit comprises a transversal filter having a reduced set of multipliers. A predetermined reference signal in the transmitted video signal, and an identical reference signal generated in the ghost cancellation circuit are used to identify optimum active multiplier positions and values during the vertical retrace interval. The optimum filter is then used to cancel any ghosts from the receiver video signal.

Abstract: A transmitting section of the system according to the invention has transmitting section signal paths for at least three classes of motion, each with a preprocessing circuit (143, 145 and 147) which are provided with means for individually sampling. These sampling means sample in accordance with separate sampling patterns so that each preprocessing circuit (143, 145 or 147) supplies a video signal which is suitable for a display with an optimum distribution of temporal and/or spatial resolution for the associated class of motion. Dependent on the class of motion determined, one of the preprocessing circuits (143, 145 or 147) is coupled to a channel (170). The video signal to be supplied to the channel (170) is therefore a video signal suitable for a display with an optimum distribution of temporal and/or spatial resolution for the given class of motion (FIG. 1A).