Abstract: A wireless transmission apparatus and a wireless transmission method capable of performing simple transmission control, in which an information transmission flow control method, instead of reporting vacant-buffer information from a receiving destination apparatus, an information transmission-source apparatus permits the transmission of a packet up to a predetermined transmission window size from the packet for which acknowledgement has not been received from an information receiving destination, and the transmission of a packet exceeding that transmission window size is inhibited. As a result, if the packet is within that transmission window size, even if the information receiving destination has not confirmed the reception of the acknowledgement (ACK) information, the packet is transmitted unconditionally.

Abstract: In a heat radiator plate, a mounting bracket extending from a peripheral edge portion of the heat radiator plate, an auxiliary heat radiator plate portion extending along the mounting bracket and positioned between the mounting bracket 39 and a body through a gap and a radiant heat radiator portion formed on a top end of the auxiliary heat radiator plate portion and opposing to the body through the gap are provided. Heat generated by a circuit construction body is conducted from the heat radiator plate, the auxiliary heat radiator plate portion and the radiant heat radiator portion to the gap and radiated to the body through the gap. The heat radiation characteristics of the connector box are improved.

Abstract: A wireless transmitting method and a wireless transmitter capable of performing efficient wireless transmission depending on the length of asynchronous information involves forming a wireless network using a plurality of communicating devices to carry out asynchronous transmission of information and includes the steps of building a monopayload packet having one of predetermined information units of the information as a data payload, building a multipayload packet having a plurality of predetermined information units of the information as a data payload, and carrying out the asynchronous transmission by wireless packet obtained by optionally combining the monopayload packet with the multipayload packet depending on the length of the information to be asynchronously transmitted by wireless. Therefore, it is possible to carry out efficient asynchronous wireless transmission.

Abstract: In a self-organized distribution type wireless network without relationship between a controlling station and a controlled station, in order to execute a channel access by effectively utilizing a plurality of frequency channels, there is provided a communication system. In the system, a communication station determines a seed and generates a frequency channel switching pattern basing upon the seed. The seed is written in a beacon in each transmission frame to notify it to other stations. A new entry station scans all frequency channels, identifies a channel switching pattern of the frequency channels in accordance with the seed in the beacon received from another station, selects a candidate of a beacon transmission position and a transmission channel, and determines the beacon transmission position and transmission channel which are best for own station to transmit a beacon.

Abstract: Communication bands are effectively allocated to each communication station under a communication environment of an autonomous distributed type system such as an ad-hoc communication. Each communication station acquires a priority slot with which each communication station itself performs data transmission preferentially at predetermined time intervals, and releases or allocates its own priority slot to other communication station in response to a permission form upper layer of a communication protocol based on a fact that the transmission data is not in a buffer. Thereby, it is able to effectively utilize the communication bands, and to improve a throughput of the whole system.

Abstract: In a wireless transmission control method for controlling wireless communication access among a plurality of communication stations via wireless transmission of a control signal from a central control station to a terminal station, a communication station selected as the central control station judges a station with which each terminal station in a wireless network is capable of directly making communication. When it is detected that each terminal station is capable of directly making communication with a communication station having many more stations than those directly making wireless communication with the central control station, processing for changing the detected terminal station to the central control station is performed. Thus, when the control station is set and the access management of wireless communication is carried out under the control of the control station, the control station can be selected easily and satisfactorily.

Abstract: In order to define and validate a station in a same network easily by specifying a unique network ID in a wireless network system, by using the validation information including the unique network ID in the wireless network system, it is designed to execute, as required, a process of subscribing and connecting to an existing wireless network system in the own station, a process of building up a new wireless network system starting from the own station, a process of transmitting validation information to other station in non-registered state of network ID, as the own station subscribed to the existing wireless network system working as the control station, and a process of removing the station subscribed to the existing wireless network system from the network.

Abstract: A method for allowing a communication station to newly join an existing radio network constituted of plural units of communication stations includes a radio transmission a method for carrying out radio transmission in a radio network formed of plural communication stations by a control signal from a communication station set up as a central control station, including the steps of: specifying a frame cycle of a radio transmission signal by a control of the centrat control station; setting a predetermined position in the specified frame cycle as a slot for newly joining the radio network; and if a predetermined signal is transmitted through the slot, carrying out a processing for allowing a transmission source of the signal to join the radio network.

Abstract: A cable communication apparatus includes a wireless reception unit for establishing a predetermined wireless communication data structure and receiving wireless communication band acquiring request information transmitted from a wireless communication apparatus, a first wireless transmission unit for wirelessly transmitting wireless communication band assignment information based on the wireless communication band acquiring request information, a cable reception unit for receiving isochronous communication information transmitted from various devices connected thereto via a high-speed serial bus, an information converting unit for converting the isochronous communication information into data information arranged in units of blocks based on a predetermined format established in accordance with the wireless communication band assignment information, and a second wireless transmission unit for wirelessly transmitting the data information.

Abstract: A wireless transmitting method capable of simplifying a transmission packet. In which error correction codes C11 to C16 added to data information (FIG. 4A) sent from various equipments connected through a high-speed serial bus are removed to convert the data information into data information (FIG. 4B) in a predetermined wireless environment, and error correction codes C21 to C24 are added to the data information (FIG. 4B) in the predetermined wireless environment thus converted as shown in FIG. 4C for transmitting by wireless as shown in FIG. 4D.

Abstract: A radio communication method or system for transmitting part of the control signal addressed to a terminal station from a base station by means of a narrow-band carrier which is narrower than the band of multi-carrier signal and is arranged in the vicinity of the frequency band used for information transmission, in the case where a plurality of frequency bands for information transmission exist continuously. It may be modified such that part of the control signal addressed to the terminal station, which is transmitted from the base station, is transmitted by means of one or more subcarriers in the band of the multi-carrier signal. A radio communication method for exchanging information between a base station and a terminal station in the frame period by means of multi-carrier signals due to OFDM modulation scheme, in which the transmission of part of the control signal addressed from the base station to the terminal station is accomplished by means of the specific position in the frame period.

Abstract: A frame period is specified by means of a predetermined signal; a management data transmission region is set in this frame period; and when common information to be transmitted from the control station in the management data transmission region is received at a plurality of communication stations, any of these communication stations performs processing for repeatedly transmitting the received common information, whereby when communications in a network system are controlled by a control station, a station incapable of directly making communication with a control station can be controlled satisfactorily.

Abstract: When an access of wireless communication among a plurality of communication stations is polling-controlled by a control station, polling control information is transmitted to a specific communication station incapable of directly making wireless communication with the control station by relaying a predetermined communication station, whereby a station incapable of directly making communication with a control station can be controlled satisfactorily when control in a network system is controlled by the control station.

Abstract: A wireless transmission apparatus and a wireless transmission method capable of performing simple transmission control are provided. As an information transmission flow control method, instead of reporting vacant-buffer information from a receiving destination apparatus, an information transmission-source apparatus permits the transmission of a packet up to a predetermined transmission window size from the packet for which acknowledgement has not been received from an information receiving destination, and the transmission of a packet exceeding that transmission window size is inhibited. As a result, if the packet is within that transmission window size, even if the information receiving destination has not confirmed the reception of the ACK information, the packet is transmitted unconditionally. Furthermore, a transmission pointer and an ACK receiving pointer are provided, and even if acknowledgement is not received, control is performed using that transmission window size in which transmission is possible.

Abstract: To provide a wireless transmitting method and a wireless transmitter capable of performing efficient wireless transmission depending on the length of asynchronous information. The wireless transmitting method for forming a wireless network using a plurality of communicating devices to carry out asynchronous transmission of information comprises the steps of building a monopayload packet 46 having one of predetermined information units (units) of the information as a data payload, building a multipayload packet 40 having a plurality of predetermined information units (units) of the information as a data payload, and carrying out the asynchronous transmission by wireless packet obtained by optionally combining the monopayload packet 46 with the multipayload packet 40 depending on the length of the information to be asynchronously transmitted by wireless. Therefore, it is possible to carry out efficient asynchronous wireless transmission.

Abstract: The present invention relates to a high-temperature microscope. According to this invention, a specimen is held in vacuum with one side of it heated through exposure to an electron beam and the other side of it observed through an observation window.A curtain of inert gas is formed between the specimen and the observation window to prevent the window from being clouded, i.e., to prevent vapor deposit on the window from the specimen.Visual observation (including photography) and measurement of the specimen temperature by heat radiation therefrom are done individually with different bands of wavelengths. For the purpose of illuminating the specimen, beams of spectral distribution containing the components of in the visible band for observation are used but no components of the temperature-measuring band are utilized as light source. For the purpose of visual observation, a narrow visible band contained in the aforesaid beam located in low brightness in the heat radiation beams from the specimen is utilized.