Patents Assigned to Matsushita Communication Industrial Co., Ltd.
-
Patent number: 6813357Abstract: In a set-up phase, the base station formulates the secret key S and holds it in secret. The secret information Si which are obtained by dividing the secret key S are distributed in secret to respective terminals 1 to 5 by using cryptographic communication means. In a preparatory phase, the base station 0 broadcasts the preparatory information C1(=gk modp), the exclusive information C2(=y5k modp), the ciphertext C3(=M×K modp), and the particular terminal number 5 to all terminals. In a key sharing phase, the terminal 1 calculates a product of C1{circumflex over ( )}(&lgr;(1, &Lgr;) modq) modp and C2{circumflex over ( )}(&lgr;(5, &Lgr;) modq) modp by using the preparatory information C1 and the exclusive information C2 to obtain K and then calculates M, which are common data to the base station 0, by dividing the ciphertext C3 by K. The terminals 2 to 4 execute similar calculations. As a result, the terminals 1 to 4 can share mutually the common data M.Type: GrantFiled: August 24, 2000Date of Patent: November 2, 2004Assignee: Matsushita Communication Industrial Co., Ltd.Inventors: Natsume Matsuzaki, Jun Anzai, Tsutomu Matsumoto
-
Publication number: 20040216037Abstract: A document processing apparatus that automatically carries out a transmission operation at the time of a link selection, which selects a telephone number described in the link information without carrying out a useless operation. The link information is the additional information which is not actually displayed, like as the HTML. The document processing apparatus includes a receiver for receiving the document; a link information extractor for extracting the link information from the document; a display for displaying the document based on the link information extracted by the link information extractor; a selector for selecting the link information in the document; and a link operator controller for carrying out the transmission operation to another party when the link information selected by the selector is the telephone number information.Type: ApplicationFiled: May 19, 2004Publication date: October 28, 2004Applicants: Matsushita Electric Industrial Co., Ltd., Matsushita Communication Industrial Co., Ltd., NTT DoCoMo, Inc.Inventors: Toshihiro Hishida, Seiji Ura, Hidehiko Shin, Junji Ishigaki, Keizaburo Sasaki, Eriko Ooseki
-
Patent number: 6804507Abstract: When a page message containing a caller ID is received from a caller, a call back message containing one of prepared response messages is transmitted to a call number associated with the caller ID. For this, the system displays the prepared response messages and prompts the user to select one of them. A call back message is compiled from a call back number associated with a caller ID contained in the page message and the selected response message. The call back message is transmitted to the call back number. The compilation of call back message is performed such that the format of call back message is adapted to the type of the caller's communication device associated with the caller ID.Type: GrantFiled: October 3, 2002Date of Patent: October 12, 2004Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network, Inc.Inventors: Hironari Ishikawa, Hitoshi Itakura, Hisashi Nakagomi
-
Patent number: 6766172Abstract: A road vehicle communication method allows bothway communication to be held between a mobile station, which sends a request for an information service and receives it, and a central base station and local base stations located at a roadside for sending the information service to the mobile station. The central base station and the local base stations use optical fibers in part of the transmission path thereof for the bothway communication and perform at least one of electric-to-optical conversion and optical-to-electric conversion. The mobile station is caused to send the request for an information service beforehand. In response to the request, the local base station covering the mobile station expected to receive the information service is estimated. When the mobile station lies in a service area to which the local base station estimated is assigned, a control station is caused to provide the mobile station with information corresponding to the information service requested.Type: GrantFiled: September 19, 2000Date of Patent: July 20, 2004Assignees: Oki Electric Industry Co., Ltd., Communications Research Laboratory, Ministry of Posts and Telecommunications, Matsushita Communication Industrial Co., Ltd.Inventors: Kiyohito Tokuda, Kinya Asano, Masayuki Fujise, Fumihide Kojima, Masahiro Watanabe, Ryobun Tachita
-
Patent number: 6708200Abstract: There is provided a communication system capable of reducing the burden of the terminal that is connected to the Internet via the communication network such as the mobile telephone network, whose security is ensured, and is used to carry out the electronic commerce and the banking service. An encryption communication request generating portion (101) of a client system (100) sends out a security request of a communication route to a gateway server unit (200), an encryption communication controlling portion (203) of the gateway server unit sets up encryption communication between a content server unit (300) and the gateway server unit in response to this, the content server unit encrypts data to be transmitted to the client system and then transmits it to the gateway server unit, and an encryption communication controlling portion of the gateway server unit decrypts this data and transmits it to the client system.Type: GrantFiled: September 25, 2000Date of Patent: March 16, 2004Assignees: Matsushita Electric Industrial Co., Ltd., Matsushita Communication Industrial Co., Ltd., NTT DoCoMo, Inc.Inventors: Seiji Ura, Yoshifumi Yonemoto, Hiromi Wada, Junji Ishigaki, Masaharu Nakatsuchi, Keizaburo Sasaki
-
Patent number: 6466782Abstract: A system with a mobile phone capable of receiving a paging message. A method and apparatus automatically transmits a callback message to a callback number associated with the caller in response to a page message. The user of the system prepares a data structure in which a caller ID of each of the prospective callers in associated with information on the caller as well as the caller's communication device. In response to the reception of a page message, the user can display a response message used for calling back the caller when the user is busy. When the user selects the response message, the call back message is compiled using a call back number associated with a caller ID contained in the page message. The callback message can then be sent to the caller.Type: GrantFiled: March 2, 1998Date of Patent: October 15, 2002Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network, Inc.Inventors: Hironari Ishikawa, Hitoshi Itakura, Hisashi Nakagomi
-
Patent number: 6289064Abstract: A synchronization equipment performs correlation processing between a first known pattern included in a received signal and a second known pattern, and detects reception timing of the received signal. A correlation value computing portion computes a correlation value between the first known pattern and the second known pattern at every reception time. A reception timing detection portion compares the computed related value with a predetermined threshold value, determines the reception time when the correlation value becomes larger than the threshold value to be the reception timing of a received signal, and, after this determination, suspends the comparison between the correlation value and the threshold value, and holds the reception time determined to be the reception timing.Type: GrantFiled: March 5, 1997Date of Patent: September 11, 2001Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communication Network Inc.Inventors: Katsuhiko Hiramatsu, Mitsuru Uesugi, Sadaki Futagi, Hiroshi Suzuki, Hitoshi Yoshino
-
Patent number: 6032029Abstract: An equalizer block forming part of a receiver compensates transmission path characteristics of a baseband received signal to generate a prediction signal, and differential-logic-converts a demodulated signal generated by demodulating the prediction signal to generate a differential-logic-conversion demodulated signal. A differential-detection demodulator block differential-detects the prediction signal from the equalizer block and subsequently demodulates the differential-detected prediction signal to generate a differential-detection demodulated signal. A selector block selects either the differential-logic-conversion demodulated signal from the equalizer block or the differential-detection demodulated signal from the difference-detection demodulator block.Type: GrantFiled: March 24, 1997Date of Patent: February 29, 2000Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network Inc.Inventors: Sadaki Futagi, Mitsuru Uesugi, Hiroshi Suzuki, Hitoshi Yoshino
-
Patent number: 5960336Abstract: A data receiving apparatus is constructed to make comparison of received signal strength of a plurality of receiving antennas by making use of timing of a sync word, which is not necessary for making synchronization acquisition, among a plurality of sync words contained in a subframe of a receiving signal, and then to select a receiving antenna of the highest received signal strength from among the plurality of receiving antennas, in accordance with a result of the comparison made before then.Type: GrantFiled: May 6, 1997Date of Patent: September 28, 1999Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network Inc.Inventors: Keiichi Ikawa, Tetsuaki Nakanishi, Kazuhisa Tsubaki, Kazuhiro Umetsu, Tadao Takami
-
Patent number: 5659893Abstract: In a transmission circuit, part of the output signal of the transmission circuit is diverted by an output monitor circuit and subjected to envelope detection by an output detector circuit. The output signal of the output detector circuit is inputted to a peak hold circuit successively holding the peaks of the input signal, so that varying amplitude components are removed, and a DC value is detected. An error detector circuit compares the detected value with a reference signal from a reference signal generator circuit, and the error signal is used as a gain control signal to control the gain of a power amplifier circuit.Type: GrantFiled: November 18, 1994Date of Patent: August 19, 1997Assignees: Matsushita Communication Industrial Co., Ltd., NIT Mobile Communications Network, Inc.Inventors: Takashi Enoki, Masaharu Nakatsuchi, Kohji Chiba, Fujio Sasaki
-
Patent number: 5500856Abstract: A base station of a CDMA communication system includes a transmission de-correlator for eliminating interferences between communication channels of a downlink. The transmission de-correlator has a memory storing a set of data representative of the products of transmission information bits for the respective channels, and the sums of the products of the spread code data sequences for the respective channels, and the elements of an inverse matrix with respect to a predetermined matrix of a cross-correlation between the spread code data sequences for the respective channels. The sums correspond to additions of the products along a direction of columns or to additions of the products along a direction of rows of the inverse matrix. A counting device is operative for causing the memory to sequentially output the data therefrom. An adder serves to calculate a sum of the data outputted from the memory.Type: GrantFiled: July 28, 1994Date of Patent: March 19, 1996Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network, Inc.Inventors: Taku Nagase, Roland Go, Tadashi Matsumoto, Akihiro Higashi
-
Patent number: 5471323Abstract: By applying the offset sampling using four-plane prism provided with four solid state imaging devices at four light output planes, chromatic aberration of lenses is eliminated even to the peripheral part of the imaging plane, and moire suppression effect is much enhanced. Furthermore, by using a plural number of matrix circuits, and by producing the luminance signal by changing the matrix ratios in low frequency range and in high frequency range, moire suppression effect is further enhanced, and luminance error is also eliminated.Type: GrantFiled: May 17, 1994Date of Patent: November 28, 1995Assignees: Matsushita Electric Industrial Co., Ltd, Matsushita Communication Industrial Co., Ltd., Nippon Hoso KyokaiInventors: Keisuke Suetsugi, Hiroshi Kanno, Masayuki Sugawara, Kohji Mitani, Yoshihiro Fujita, Toshinori Saitoh, Yuichi Ninomiya
-
Patent number: 4939785Abstract: In a radio communication network system for use in carrying out communication with a plurality of radio telephone sets in a service zone by the use of a control channel and a plurality of speech channels, a connecting equipment unit (CE) is selectively operable in cooperation with a radio control unit (RCU) in a speech mode of forming a speech path through a selected one of the speech channels and an additional mode of selectively monitoring the control and the speech channels. The additional mode may be divided into first and second control modes for allowing and rejecting reception of a call with the control channel monitored, respectively. Alternatively, either a rest mode or a combination of rest and initial program loading modes may be added to the additional mode. A plurality of the connecting equipment units may be located in a single service zone and selectively put into the speech and the additional modes with only one of the connecting equipment units kept in the first control mode.Type: GrantFiled: May 31, 1988Date of Patent: July 3, 1990Assignees: Nippon Telegraph and Telephone Corp., Matsushita Communication Industrial Co., Ltd., NEC Corp.Inventors: Yoshitoshi Murata, Masahiko Hirono, Toshihiko Shibata, Fumio Suzuki, Mitsuo Sato, Tadao Hashimoto
-
Patent number: 4852148Abstract: A radio telephone system has a radio telephone set which has a receiving circuit the power of which is turned on or off in predetermined cycles, a radio connector transmit an ID number of the radio zone where it exists for a longer period than the period of turning on or off the power supply of the receiving circuit of the radio telephone set in predetermined cycles, the radio telephone set compares the ID number of the radio zone received with that stored in a memory, and when the ID numbers fail to coincide with each other, the ID number of the radio telephone set and the ID number of the radio zone received are transmitted as a position entry signal to a radio channel control unit through the radio connector, and the radio channel control unit being adapted to register the ID number of the radio telephone set and that of the radio zone.Type: GrantFiled: June 15, 1988Date of Patent: July 25, 1989Assignees: Matsushita Communication Industrial Co., Ltd., Nippon Telegraph and Telephone Corporation, NEC CorporationInventors: Toshihiko Shibata, Mitsuo Sato, Yoshitoshi Murata, Noriaki Nagashima
-
Patent number: 4843622Abstract: For use in a mobile radio telephone network including radio telephone sets movable in an area divided into a predetermined number of zones, a communication control system includes a searching arrangement (25, 33) for searching one (15') of radio communication devices of the network as a searched communication device that is assigned to a present one of the zones into which a specific one (11') of the radio telephone sets has moved from a previous one of the zones. For operation of the searching arrangement, a communicating arrangement (22, 25, 32) of the system sends a call signal to a specific one of the radio communication devices that is assigned to the previous zone to transmit the call signal to the specific telephone set and receives a response signal transmitted from the specific telephone set if the specific telephone set were in the previous zone.Type: GrantFiled: April 4, 1988Date of Patent: June 27, 1989Assignees: NEC Corporation, Kabushiki Kaisha Toshiba, Matsushita Communication Industrial Co., Ltd., Nippon Telegraph and Telephone CorporationInventors: Akio Yotsutani, Yukihiro Sako, Toshihiko Shibata, Yoshitoshi Murata
-
Patent number: 4262312Abstract: A magnetic recording and printing device for card mediums, having a magnetic recording section and a printing section, wherein the card mediums are transferred along the peripheral surface of a rotary cylinder which serves as a platen for printing, and during the transfer of the card mediums, data are magnetically recorded and read out by a magnetic head stationarily disposed close to but separated from the peripheral surface of the rotary cylinder.Type: GrantFiled: March 12, 1979Date of Patent: April 14, 1981Assignees: Matsushita Communication Industrial Co., Ltd., Mitsubishi Heavy Industries, LimitedInventors: Kazumi Fukuda, Takeshi Horino, Katsuhiro Komorida