Abstract: A slave device is determined as a sharing target to which sharing of the channel map is executed according to a communication state of the wireless communication between the master device and each of a plurality of slave devices. When the number of slave devices determined as the sharing target to which the sharing of the channel map is executed is small, the timing for executing the sharing of the channel map is set to be advanced as a whole of the slave devices determined as the sharing target, compared with a case where the number of slave devices determined as the sharing target is large.

Abstract: A master device repeats transmitting a channel map when determining that sharing of the channel map is succeeded since a reception confirmation signal from the slave device cannot be received normally although the master device transmits the channel map to the slave device. Even though the numerical number of channel map transmissions reaches the first predetermined number of times, when determining that the channel map has never been shared even once, the master device disconnects communication connection with the slave device at a predetermined timing.

Abstract: A wireless communication system includes a master device and multiple slave devices. Each slave device executes a wireless communication with the master device using a communication channel sequentially selected from multiple communication channels. The wireless communication system is configured to: determine, in the wireless communication between the master device and each of the plurality of slave devices, a communication quality of each of the multiple communication channels; determine at least one target communication channel to be used for the wireless communication based on a determination result of the communication quality of each of the multiple communication channels; and repeatedly select, from the plurality of slave devices, an execution target of determination of the at least one target communication channel to be used for the wireless communication.

Abstract: A wireless communication system that performs wireless communication between a master device and a slave device is configured to detect characteristic data indicating communication quality in the performed wireless communication, delete the communication channel which is determined not to satisfy a predetermined communication quality standard, determine whether a total number of the plurality of communication channels used for the wireless communication is smaller than a minimum limit value, and change the plurality of communication channels used for the wireless communication to the plurality of communication channels that satisfies a relaxed communication quality standard.

Abstract: A wireless communication system is configured to detect characteristic data indicating communication quality in the performed wireless communication, for each of the communication channels, delete communication channel, in which deterioration in communication quality is determined based on the characteristic data detected by the detection unit, from the plurality of communication channels used for the wireless communication, and determine, based on the characteristic data of a neighboring communication channel close in frequency to a communication channel that has been deleted by the deletion unit, restorability of the deleted communication channel to the plurality of communication channels used for the wireless communication.

Abstract: A wireless communication system, which performs wireless communication between a master device and a slave device, is configured to: detect characteristic data indicating a communication quality of wireless communication for each communication channel; generate, for each communication channel, first evaluation data and second evaluation data, based on the detected characteristic data, the second evaluation data having a higher responsiveness to a change occurred in the characteristic data compared with the first evaluation data; determine deterioration of the communication quality for each communication channel based on the first evaluation data and the second evaluation data; decide one communication channel whose communication quality is determined to be deteriorated as a communication channel to be excluded from the multiple communication channels for performing the wireless communication.

Abstract: Image data representing a two-dimensional image is stored in N data storage devices driven in parallel. The two-dimensional image is divided into small divisional areas arranged in rectilinearly oriented lines and rows such that the number of areas in each line is equal to 2N and the number of areas in each row is equal to or less than 2N. The small divisional areas are stored in the N data storage devices such that no more than two of the areas in the same line are stored in the same storage device and no more of than two of the areas in the same row are stored in the same storage device. Additionally, two areas from the same line which are stored in the same storage device are positioned either adjacent to one another in the line or at opposite ends of the line and two areas from the same row which are stored in the same storage device are positioned either adjacent to one another in the row or at opposite ends of the row.

Abstract: An information input/output system is made up of an information processing device and a wireless coordinate indicator. The information processing device provided with a display for displaying an object to be processed at a desired position, a position detector for detecting positional information based on indication information from the wireless coordinate indicator, a code extractor for extracting coded information from the indication information, an information controller for storing detected positional information and the extracted coded information by associating the information items with each other, and an information processing device for carrying out predetermined processing. The wireless coordinate indicator provided with a storage device for storing the coded information, and a signal transmission device for transmitting the coded information and the positional information to the information processing device.