Abstract: A method for displaying a video stream according to a format defined by a user, wherein a graphic element is superimposed on the displayed video stream, and wherein the dimensions and/or position of the graphic element are modified as a function of commands received from the user, so as to define a screen area in which a certain portion of the frames of the video stream is displayed. The video stream is then displayed in a format wherein, for each frame, the frame portion defined by the graphic element is displayed with altered dimensions and/or position on the screen.

Abstract: A method for displaying a video stream according to a format defined by a user, wherein a graphic element is superimposed on the displayed video stream, and wherein the dimensions and/or position of the graphic element are modified as a function of commands received from the user, so as to define a screen area in which a certain portion of the frames of the video stream is displayed. The video stream is then displayed in a format wherein, for each frame, the frame portion defined by the graphic element is displayed with altered dimensions and/or position on the screen.

Abstract: The invention relates to a television set provided with a alphanumerical display device for displaying on the television screen (6), as an alternative to the received video picture, another complete picture constituted by alphanumerical data which can comprise all the letters in the alphabet, the numbers from 0 to 9 and graphic symbols.The invention also relates to a receiver provided with color picture display means for displaying, following a control from the user, a calendar data constituted by at least one of the said colour pictures and composed of alphanumerical characters.The invention also relates to a receiver for receiving radioelectric signals which is provided with an alphanumerical character display device in which the tuning of a radioelectric signal takes place by means of a message from the user composed of alphanumerical characters and representative of the station which transmits the said radioelectric signal.

Abstract: A television tuning system with a circuit for preventing the loss of information during power outages is disclosed. A disable signal is generated in response to the interruption of a mains power supply. In response to the disable signal, a series of fixed signals are applied to at least one of the date and address terminals of a memory containing the information to be preserved. An appropriate signal for preventing the information stored in the memory from being changed during the period in which the disable signal is generated is also applied to the memory.

Abstract: A circuit arrangement for tuning into one of a number of radioelectric signals receivable on a signal receiver set is provided in accordance with the teachings of the present invention. The circuit arrangement consists of a controllable oscillator, whose frequency is determined by a control loop, in accordance with a binary number N. The binary number N is supplied by a processing unit on the basis of coded input data. Within the control loop, frequency division occurs so that a first signal is obtained from the controllable oscillator which is dependent at least on the number N. This first signal is then compared with a second reference frequency signal, to obtain a third signal for required tuning. A memory with a number of storage locations for storing data relative to signals tuned in digital form is also provided.

Abstract: A television set having a picture display device, means for tuning into selected radiated television signals and means for supplying the received signal pictures to the said display device, the set further comprising a preferably non-volatile memory containing coded data corresponding to at least one full picture other than the pictures contained in the received signal, and means for reading and decoding the data in the memory and supplying a signal to the said display device to display the stored data visually.

Abstract: A circuit arrangement for tuning into one of a number of radioelectric signals receivable on a signal receiver, comprising a controllable oscillator the frequency of which is determined by a control loop depending on a digital number N from a processing unit, in turn, dependent on coded input data. The loop comprises a frequency divider for obtaining a first signal from the controllable oscillator depending at least on the number N and a comparitor for comparing the first signal with a second frequency reference signal so as to obtain a third signal for required tuning. The circuit arrangement further prevents signals from being sent to the receiver loudspeaker for a preset length of time if the variation in the number N is over a preset threshold within a preset time interval.

Abstract: The present invention relates to a television tuning system comprising a frequency synthesizer, which includes a variable frequency divider and which enables the television set to be selectively tuned to different television channels, and an arrangement operable to generate and display on the television picture display a combination of alpha-numeric characters containing information concerning the channel selection.

Abstract: A circuit arrangement for selecting a radioelectric signal from a number of signals receivable by a signal receiver equipped with a character display device to enable at least two selection modes of the radioelectric signal. The circuit arrangement has a controllable oscillator, the frequency of which is determined by a control loop depending on a binary number N supplied by a processing unit on the basis of code input data. The control loop has frequency dividing means providing a first signal from the controllable oscillator depending on the number N and the comparator for comparing the first signal with a second frequency reference signal to provide a third signal for the required tuning. A memory circuit has a number of cells for digital storage of data relevant to the signals being tuned into. The said number N can be supplied both in direct response to the coded input data or by calling up data from the memory circuit.

Abstract: The invention relates to a circuit arrangement for vertical synchronization of a television receiver. Vertical synchronization pulses are generated by dividing pulses derived from a line frequency signal and these signals are compared with the received synchronization pulses. The circuit is designed to ignore spurious received sync pulses and to compensate for omitted sync pulses but automatically resets the divider for rephasing the generated sync signals when found to be out of phase with the received signals.

Abstract: A circuit device for a television receiver having a tuner device with a tuner memory operable to control the tuning of the receiver to stations selected by a user, in which there are further provided means for automatically adjusting the controls of the receiver whenever the station to which the receiver is tuned is changed, this means comprising one or a plurality of random access memories addressed by signals from the tuner memory which are characteristic of each individual station, the output signal from the RAM, (or the enabled RAM if there are a plurality of them) representing the contents thereof at the location addressed, is fed to a digital-to-analogue converter which produces an output voltage signal for adjusting the associated receiver control; changes to the content of the RAM can be made by means of an associated counter controlled to count up or down by a push button panel.

Abstract: A television or radio receiver having electronic means for selecting the frequency to which the receiver is to be tuned, in which the selection is effected by means of a voltage controlled oscillator controlled by a control loop which receives the output signal from the oscillator, divides it by a number derived from a memory which stores a plurality of numbers corresponding to the available frequencies for reception by the receiver, compares the divided signal with a reference frequency to generate an error signal, and feeds the error signal through a low pass filter back to the control input of the amplifier. The time constant of the filter can be changed by short circuiting a resistor of the filter so that the control loop operates with a short time constant when actually selecting a frequency whereas it operates with a longer time constant while maintaining a selected frequency.