Abstract: A wireless communication apparatus, a wireless LAN system, an interference detecting method, and an interference avoidance method which detect the occurrence of a communication error caused by the occurrence of interference. A wireless communication apparatus (100) comprises a transmitted packet interference error detecting circuit (120) composed of an ED value detecting circuit (105) for measuring the ED value prior to packet transmission, an Ack error detecting circuit (106) for detecting an Ack error in the transmitted packet, and a transmitted packet interference error determining circuit (107). When the Ack error is detected in a packet transmitted on condition that the measured ED value exceeds the threshold value of interference determination, the apparatus (100) determines it to be an interference error.

Abstract: A wireless communication apparatus capable of shortening the handover time and preventing the connection from being interrupted during telephone communication. In this apparatus, an HO part (109), when detecting an access point, outputs an handover control signal for performing a handover that is a process of switching from a communication using a third generation mobile communication system to a communication using a WLAN. A positional information acquiring part (112) receives a GPS signal transmitted from a GPS satellite and generates GPS information indicative of the position of the local apparatus. When the GPS information shows that the local apparatus approaches the area of the WLAN by a predetermined distance, a period deciding part (115) decides that the period be shorter than when the local apparatus is at the predetermined distance away from the area of the WLAN.

Abstract: A wireless communication apparatus, a wireless LAN system, an interference detecting method, and an interference avoidance method which detect the occurrence of a communication error caused by the occurrence of interference. A wireless communication apparatus (100) comprises a transmitted packet interference error detecting circuit (120) composed of an ED value detecting circuit (105) for measuring the ED value prior to packet transmission, an Ack error detecting circuit (106) for detecting an Ack error in the transmitted packet, and a transmitted packet interference error determining circuit (107). When the Ack error is detected in a packet transmitted on condition that the measured ED value exceeds the threshold value of interference determination, the apparatus (100) determines it to be an interference error.

Abstract: A wireless communication apparatus capable of shortening the handover time and preventing the connection from being interrupted during telephone communication. In this apparatus, an HO part (109), when detecting an access point, outputs an handover control signal for performing a handover that is a process of switching from a communication using a third generation mobile communication system to a communication using a WLAN. A positional information acquiring part (112) receives a GPS signal transmitted from a GPS satellite and generates GPS information indicative of the position of the local apparatus. When the GPS information shows that the local apparatus approaches the area of the WLAN by a predetermined distance, a period deciding part (115) decides that the period be shorter than when the local apparatus is at the predetermined distance away from the area of the WLAN.

Abstract: A terminal apparatus that selects, from among a plurality of communication modules, a communication module, which is useful to the user, without increasing current consumption and starts communication in a short time. In this apparatus, which includes a cellular communication module (210) for performing cellular communication and a WLAN communication module (220) for performing WLAN communication, the WLAN communication module (220) is activated by a user operation performed prior to the starting of communication, thereby preferentially performing the connection to a WLAN communication system. There is also included a mail size determining circuit (233) or an activated module selecting circuit (410) as a communication module selecting means for deciding, from the content of the user operation, to select one of the cellular communication module (210) and WLAN communication module (220) that has a useful communication format to the user.

Abstract: According to the invention, a transmitter antenna selector switch 109 or a receiver antenna selector switch 111 is respectively connected between the first antenna 101a and the second antenna 101b and the transmitter 103 or the receiver 105. Transmission signals output from the transmitter 103 are supplied to either the first antenna 101a or the second antenna 101b in transmission, while reception signals are received from either the first antenna 101a or the second antenna 101b via the receiver antenna selector switch 111 in reception.

Abstract: A composite radio apparatus having two radio systems, comprises two antennas to be shared for a diversity operation of the two radio systems, and two antenna changeover switches for switching the two antennas, wherein the two antenna changeover switches serve to directly connect the two antennas to respective input/output sections of the two radio systems. In the composite radio apparatus according to the invention, the two antenna changeover switches are operated such that one of the antenna changeover switches connects one of the two antennas to the input/output section of one of the two radio systems when the other antenna changeover switch connects the other antenna to the input/output section of the other radio system.

Abstract: A thermosensitive recording material which comprises a support having a low Streckigt sizing degree, an undercoat layer comprising an oil absorbable pigment and a carboxymethyl cellulose, and a thermosensitive recording layer coated on the undercoat layer.The thermosensitive recording material of this invention can be used in a high speed recording system, since it has a high sensitivity, a high image quality and a low capacity to adhere stain to a thermal head, and these advantages can be improved further by adding an appropriate amount of paraffin wax to the undercoat layer. The thermosensitive recording material can be produced economically because a low cost material having a low Steckigt degree can be used as the support.

Abstract: A microcapsule sheet is disclosed. At least one surface of the base paper has a coating produced from a solution that contains microcapsules each containing an electron donating color former, a binder whose solid content is from 20 to 50 parts by weight based on 100 parts by weight of the solid content of the microcapsules, a protective agent and a surfactant having a hydrophobic atomic group of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each an aliphatic hydrocarbon having 2 to 20 carbon atoms or aromatic hydrocarbon having 6 to 20 carbon atoms.

Abstract: A process for producing microcapsules comprising forming capsule membranes of a polymer of melamine and formaldehyde in the presence of a styrene-sulfonic acid polymer.

Abstract: Microcapsules with a melamine-formaldehyde or urea-formaldehyde resin capsule shell are produced by adding in advance a polyvalent isocyanate, a polyvalent isothiocyanate or a prepolymer thereof to the hydrophobic oily liquid to be encapsulated, emulsifying the hydrophobic oily liquid in an aqueous solution of a water-soluble polymer, adding an aqueous solution of melamine and formaldehyde or a precondensate thereof or urea and formaldehyde to the emulsion, and polymerizing the melamine and formaldehyde or a precondensate thereof or the urea and formaldehyde.

Abstract: A method of preparing a dispersion of microcapsules whose walls comprise formaldehyde as one of the wall components characterized by adding urea, a sulfite or a hydrogensulfite to said dispersion.

Abstract: A process for forming color images which comprises image-wise exposing a silver halide photographic material, subjecting the exposed photographic material to color development and then fixing the developed material with a fixing bath having a pH of at least 6, the process being free from a silver bleaching (elimination) step. The process is especially suitable for application to radiographic materials.

Abstract: A capsule solution is prepared by polymerizing urea and formaldehyde in the presence of gum arabic to thereby form a urea-formaldehyde resin wall around a hydrophobic oily solution. The use of gum arabic reduces the viscosity of the capsule solution, the capsule solution which is obtained is particularly suitable for preparing pressure sensitive recording sheets.

Abstract: A method of forming microcapsules having high heat resistance and low permeability which comprises the step of forming wall films of urea-formaldehyde resin around individual droplets of a hydrophobic oily solution through the polymerization reaction of urea and formaldehyde in the presence of carboxylated polyvinyl alcohol.

Abstract: A method of recording a radiation image having excellent sharpness which comprisesimage-wise exposing to radiation, in combination with the use of a fluorescent intensifying screen, a light-sensitive photographic element comprising a water-proof opaque support, which has an average degree of reflection of about 70 percent or greater, based on the degree of reflection of a magnesium oxide white plate being 100%, in the spectral wavelength region of from about 380 m.mu. to about 600 m.mu., and having on only one surface thereof a coating of a green sensitized silver halide photographic emulsion containing a phenolic color coupler or an .alpha.-naphtholic color coupler, each capable of forming a quinoneimine dye having a maximum absorption within a spectral wavelength region of about 550 m.mu. to about 700 m.mu. on color development, where the silver halide grains of the emulsion have a number average grain size of about 0.5.mu. to about 2.2.mu. and are present in an amount of from about 0.