Abstract:
In a mobile communication system supported with IP version 6, a mobile node (10) measures at least one of a hop number or communication delay time to a belonging home agent (11). When the result of measurement is equal to or greater than a predetermined value, registration deletion is requested to the belonging home agent (11) while registration is requested to a new home agent (14). The belonging home agent (11) deletes the registration of mobile node (10), and the new home agent (14) registers the mobile node. This can reduce the load on an IP network (18) and decrease data delay.
Abstract:
The mode data of a block to be encoded are predicted from the mode data of an encoded block in the circumference of the block and encoded by using a code word table which is switched in accordance with the hit rate of the prediction. On the code word table, the lengths of the code words of the encoding mode having higher hit rates are made shorter.
Abstract:
In a mobile communication system supported with IP version 6, a mobile node (10) measures at least one of a hop number or communication delay time to a belonging home agent (11). When the result of measurement is equal to or greater than a predetermined value, registration deletion is requested to the belonging home agent (11) while registration is requested to a new home agent (14). The belonging home agent (11) deletes the registration of mobile node (10), and the new home agent (14) registers the mobile node. This can reduce the load on an IP network (18) and decrease data delay.
Abstract:
A method and device for wireless directional beam-forming transmission. The method for wireless directional beam-forming transmission between a first device and a second device comprises conducting one or more omni-directional transmissions between the first device and a third device; conducting one or more omni-directional transmissions between the second device and the third device; and determining directional information for directional beam forming transmissions between the first and second devices based on the omni-directional transmissions.
Abstract:
A picture encoder which receives, as an input, a binary digital picture having an interlace structure wherein one frame is constituted of two fields, divides the picture into two-dimensional blocks, each of which is constituted of a plurality of pixels, and then encodes the picture block by block. A picture decoder which receives a picture coded signal coded by the picture encoder and decodes, block by block, the binary digital picture having an interlace structure wherein one frame is constituted of two fields. In the picture coder, a coding mode is selected for each block from two modes, one at which a picture is coded field by field and the other at which a picture is coded frame by frame, and according to the selected mode, the picture is coded either field by field or frame by frame, for one block after another. In the picture decoder, the picture is decoded either field by field or frame by frame for one block after another based on the mode information.
Abstract:
A picture encoding device, which is provided with a reproducing section in the poststage of a picture encoding section, selects an appropriate filter for detecting noise contained in a reproduced picture and for correcting the reproduced picture in accordance with nature of the detected noise by comparing an input picture with the reproduced picture and transmits the information on the picture and information on the filter in a multiplexing way. A picture decoding device extracts the information on the picture and information on the filter by demultiplexing the transmitted information, reproduces the picture from the information on the picture, and selects a filter used for correcting the reproduced picture in accordance with the information on the filter.