Abstract: In a video recorder (2) having an electronically tunable tuner (19) and a connector (4) to which a cabling (6) can be connected, which cabling can also be connected to a connector (5) of a television receiver (3) which also has a tuner (46), at least one comparison device (69, 75, 130) of the video recorder (2) is connected to the tuner (19) of the video recorder (2) and to the connector (4) of the video recorder (2) via each time one connection (65, 66, 73, 77) in order to compare at least one component of one of the two received signals supplied by the tuner (46) of the television receiver (3) and applied to the connector (4) thereof with the corresponding component of the received signal supplied by the tuner (19) of the video recorder (2), which comparison device (69, 75, 130) supplies an inequality signal in the case of inequality of the signals applied to it, and an equality signal in the case of equality of the signals applied to it, the tuner (19) of the video recorder (2) being successively tuned to

Abstract: The binary coded data signal is divided into data blocks in the video translation system in accordance with the invention. n copies are made of each data block. Televison synchronization signals are added to the original data block and to the n copies thereof, the assembly thus forming a video data block. This video data block is transferred to a video processing device, for example, a video recorder in which it is recorded. When the video data block is recovered, the corresponding data block is recovered from the n+1 data blocks present.

Abstract: A device for interactive video playback utilizing a modified playback apparatus for video discs. Such a video disc contains stored video information and possibly also audio information. The various playback and addressing modes can be activated by operation of buttons. The information read is directly suitable for playback on a television screen. The playback apparatus is modified for executing these playback and addressing modes also under the control of selection signals received from a computer. There is also provided an extraction element for extracting the frame numbers from the information read and for supplying these numbers as data to the computer. The computer furthermore includes a read/write memory for the storage of the information of alphanumerical characters and of selection signals for the playback apparatus. In some cases, the latter signals are activatable only by a request signal. The computer also includes an output for said alphanumerical characters as additional display information.

Abstract: A keying circuit for television, in the form of a special effect generator or a chroma-keying circuit. In order to generate a keying signal which does not cause flicker phenomena in an interlaced television picture when there is a great contrast in the region of a signal switch-over between two video signals in response to the keying signal, the circuit comprises a signal delay circuit and a signal combining circuit for the binary keying signal which occurs undelayed and delayed. The signal delay device has delay times of a field period minus and plus one line period or of one and two line periods, respectively. This results in a gradually changing keying signal there, where the flicker phenomenon in the interlaced television picture might occur.

Abstract: A completely automatic suppression of an echo in a video signal is accomplished by using a multiplying circuit in the amplitude and polarity control of a correction signal which must compensate for the echo and an automatic control of the time delay of the correction signal by means of an echo polarity correction switch with which the polarity of the setting of the delay control characteristic is matched to the polarity of the echo to be suppressed.