Abstract: A data broadcasting system of the present invention transmits contents used in a program and presentation control data specifying the manner of presentation of each content, in multiplex by assigning in arbitrary channels in each program. In this system, plural contents groups composed of at least one of real time reception type contents selectively received and reproduced in real time in the receiving terminal device, first store type contents reproduced after being stored as reception is started by selection, second store type contents read and reproduced when selected as being automatically received and stored, and parallel contents combining the real time reception type contents and the first or second storing type contents are provided a series of program.

Abstract: The code division multiplex transmission system according to the present invention produces data for transmission by, time-division multiplexing the signals for synchronizing spread code prepared for an easy synchronization of spread code on the receiving side and the information related to the structure or synchronization of each of a plurality of transmission data streams such as parameters information about the coding rate of the convolution code and interleaving size for each transmission data stream, generating spread frequency modulated signals of the above time-division multiplexed signals by a spread frequency modulation using a spread code known to the receiving side, and code-division multiplexing the resulting spread frequency modulated signals over the spread frequency modulated signals of the plurality of transmission data streams.

Abstract: A data broadcasting system of the present invention transmits contents used in a program and presentation control data specifying the manner of presentation of each content, in multiplex by assigning in arbitrary channels in each program. In this system, plural contents groups composed of at least one of real time reception type contents selectively received and reproduced in real time in the receiving terminal device, first store type contents reproduced after being stored as reception is started by selection, second store type contents read and reproduced when selected as being automatically received and stored, and parallel contents combining the real time reception type contents and the first or second storing type contents are provided a series of program.

Abstract: A vertical edge width calculation circuit 31 has a plurality of series-connected delay circuits 31a to 31h each having a one-horizontal period delay time. A horizontal edge width calculation circuit has a plurality of 1-pixel delay circuits 32a to 32h corresponding to the edge width. A horizontal distance between an input digital superimpose key signal and a raster position is calculated in accordance with the calculated vertical distance, that is, the edge width. In accordance with the calculated vertical and horizontal distances, a detection circuit 34 detects as a true Euclidean distance a minimum value among a plurality of Euclidean distances between the digital superimpose key signal and the raster position which are stored in ROMs 33.sub.0 to 33.sub.5.

Abstract: A digital automatic video delay system includes a device for digitalizing a television signal with sampling clock signals having a frequency of N (an integer) times as high as the frequency of the color subcarrier of the television signal, a device for writing the digitized signal in a memory having a number of addresses equal to or higher than 2N, a device for reading out an address from the memory timed with reference clock signals based on the frequency of the color subcarrier signal, and a device for conducting the write operation and read operation simultaneously but from different halves of the memory.

Abstract: The digital chromakey system filters out a color signal from a first digital color-television signal and produces a chromakey signal which is combined with the first digital color-television signal to cancel out the color portion. The chromakey signal is also combined with a second color-television signal so that the second color television signal can be inserted into the first color-television signal whose color portion was cancelled.