Abstract: There is disclosed a data transmission system in which data are transmitted among plural stations. The system is capable of transmitting data of different rates of formats. The relationship of different sets of data is indicated by the time interval between the sets, and the interval is selected longer than a predetermined value if the sets of data are mutually irrelevant.

Abstract: An apparatus for data compression, in which a code of variable code length, for example modified Huffman code, is converted into a code of constant length through a memory stores code data obtained by conversion of input image data in a memory device on a parallel basis. The storage of the code data is controlled to cause the memory device to store each set or group of code data immediately following the code data which have already been stored there, to permit continuous code data storage without a break and thus at high speed. The code data may first be stored in a separate memory device, in sets of variable length. Code data may, for example, be formed continuously from image data released in accordance with a first clock signal, the continuous data being formed in accordance with a second clock signal the frequency of which is higher than that of the first.

Abstract: An image processing apparatus comprises a memory for storing image data of each of a plurality of blocks of an input image data, a buffer for delaying the input image data and a processor for processing the image data supplied from the buffer in a processing manner determined by the output of the memory.

Abstract: A data communication method allows communication to only one of a plurality of stations in a network which possesses a communication right. The station which possesses the communication right searches an operable station in the network, yields the communication right to the selected operable station, stores an address of the selected operable station, and in subsequent yielding of the communication right, yields the communication right to the station having the stored address.