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71. 发明专利

CA2029080A1 BATTERY SAVING SYSTEM FOR INTERRUPTING POWER SUPPLIES AT INTERVALS VARIABLE WITH TRAFFIC PATTERN 未知
公开(公告)号：CA2029080A1
公开(公告)日：1991-05-02
申请号：CA2029080
申请日：1990-10-31
申请人： NEC CORPORATION
发明人： OTSUKA, SHIGERU
IPC分类号： H04J3/00 , H04B1/16 , H04B7/15 , H04B7/26
摘要： In a communications system, a base station has a memory for storing interval control values representative of time-varying traffic pattern of the communications system. A time-keeping circuit recalls a stored interval control value from the memory according to different time of day and a battery-saving command signal is sent from the base station at variable intervals as a function of the value recalled from the memory. Power supplies of a remote station are interrupted for a constant brief interval in response to the battery-saving signal, so that the remote station is powered for a shorter interval during a light traffic period and for a longer interval during a heavy traffic period. In a preferred embodiment, traffic data is automatically collected from the communications system and the stored interval control values are updated according to the collected traffic data.

72. 发明专利

CA2028775A1 CORDLESS TELEPHONE APPARATUS 未知
公开(公告)号：CA2028775A1
公开(公告)日：1991-05-01
申请号：CA2028775
申请日：1990-10-29
申请人： NEC CORPORATION
发明人： SAEGUSA, NOBORU , KOHYAMA, NAOYUKI
IPC分类号： H04M1/725
摘要： A cordless lelephone apparatus having a connecting unit and a cordless telephone set. The apparatus processes a terminating call signal sent from the connecting unit and an originating call signal sent from the telephone set by giving priority to either one of the two signals. In a preferred embodiment which gives priority to originating call processing, the connecting unit stops sending a terminating call signal and, instead, sends an originating answer signal when an originating call signal with a coincident identification signal is detected during the course of transmission of the terminating call signal. The telephone set also sends an originating call signal when a carrier with a coincident identification signal is received. In an alternative embodiment which gives priority to terminating call processing, the connecting unit sends a terminating call signal on receiving an originating call signal with a coincident identification signal. The telephone set, even during a call originating procedure, stops transmitting an originating call signal and, instead, sends a terminating response signal when it receives a terminating call signal with a coincident identification signal.

73. 发明专利

CA2025970A1 SHIELD CASE STRUCTURE FOR AN OSCILLATOR 未知
公开(公告)号：CA2025970A1
公开(公告)日：1991-03-27
申请号：CA2025970
申请日：1990-09-21
申请人： NEC CORPORATION
发明人： NORIMATSU, HIDEHIKO
IPC分类号： H03B1/00 , H03L1/00 , H05K9/00
摘要： The structure of a shield case for covering circuitry loaded on a hybrid substrate of an oscillator and thereby isolating the circuitry from the outside. The shield case has a bottom-open box-like configuration and made of a conductive material. The conductive material is implemented with alloy which absorbs vibrations and thereby intercepts vibrations otherwise imparted from the outside to the circuitry. The physical distance between the vibration absorbing shield case and various parts of the circuitry provided on the substrate is not changed in spite of the external vibrations, whereby the oscillation frequency of the oscillator is maintained constant.

74. 发明专利

CA2022605A1 PORTABLE RADIO TRANSCEIVER SYSTEM HAVING IMPROVED ADAPTOR FOR TRANSCEIVER AND/OR IMPROVED RECEIVE SIGNAL CONTROL ARRANGEMENT 未知
公开(公告)号：CA2022605A1
公开(公告)日：1991-02-12
申请号：CA2022605
申请日：1990-08-13
申请人： NEC CORPORATION
发明人： HASHIMOTO, KAZUYA
IPC分类号： H04B1/38 , H04B7/08
摘要： In order to enable a diversity reception in a portable radiotelephone without detrimentally increasing the size and weight thereof, an adaptor (14) to which diversity antennas (20,22) are coupled and into which the radiotelephone (10) is inserted in an in-car mode, is provided with a diversity switch and a diversity switch controller. The portable radiotelephone is arranged to switch over from its own antenna to the diversity antennas upon insertion into the adaptor. The portable radiotelephone (10) is further provided with an arrangement for exhibiting a correct receive signal strength irrespective of the fact it is set in the adaptor or used in a portable mode.

75. 发明专利

CA2022153A1 MODULATOR AND DEMODULATOR FOR DATA TRANSMISSION SYSTEMS 未知
公开(公告)号：CA2022153A1
公开(公告)日：1991-02-01
申请号：CA2022153
申请日：1990-07-27
申请人： NEC CORPORATION
发明人： YOSHIDA, ATSUSHI , OISHI, HISASHI
IPC分类号： H04L27/00 , H04L27/34 , H04L27/38
摘要： A MODEM has a delay equalizer for receiving a trellis-coded test signal transmitted from an opposite MODEM and compensating for delay distortion of this test signal on the transmission path. The output of this delay equalizer and the input test signal are selectively entered into a demodulator. The output of this demodulator is assigned to predetermined signal point coordinates by a decision circuit. A Viterbi decoder computes a branch metric representing the distance between each assigned point and receive signal point from the output signals of the decision circuit and the demodulator, and figures out the pass metrics of accumulated values based on the branch metrics so computed. A difference signal represents the difference between the maximum and minimum values of the pass metrics from the Viterbi decoder. A first difference signal corresponds to the pass metrics when the delay equalizer is not set for the transmission path, and a second difference signal corresponds to the pass metrics when the delay equalizer is set for the transmission path. A control circuit compares the first and second difference signals and sets the delay equalizer out of the transmission path if the first difference signal is greater than the second, or sets the delay equalizer in the transmission path if the second difference signal is greater than the first. Thus the MODEM automatically decides whether the delay equalizer is to be inserted in the transmission path.

76. 发明专利

CA2021795A1 CHANNEL SELECTION SYSTEM FOR MOBILE RADIO COMMUNICATION EQUIPMENT 未知
公开(公告)号：CA2021795A1
公开(公告)日：1991-01-25
申请号：CA2021795
申请日：1990-07-23
申请人： NEC CORPORATION
发明人： KAGE, KOUZOU
IPC分类号： H04W48/16

77. 发明专利

CA2019600A1 MULTIPLE ACCESS SATELLITE COMMUNICATION SYSTEM FOR MINI-EARTH STATION NETWORKS 未知
公开(公告)号：CA2019600A1
公开(公告)日：1990-12-22
申请号：CA2019600
申请日：1990-06-22
申请人： NEC CORPORATION
发明人： KOU, YUKARI
IPC分类号： H04B7/212 , H04L1/00 , H04L1/16

78. 发明专利

CA2018590A1 APPARATUS FOR REFERRING TO A CONTENT OF A DIAL MEMORY IN A TELEPHONE SET 未知
公开(公告)号：CA2018590A1
公开(公告)日：1990-12-09
申请号：CA2018590
申请日：1990-06-08
申请人： NEC CORPORATION
发明人： KOMA, NORIKO
IPC分类号： H04M1/2745

79. 发明专利

CA2017105A1 OPTICAL COUPLER 未知
公开(公告)号：CA2017105A1
公开(公告)日：1990-11-19
申请号：CA2017105
申请日：1990-05-18
申请人： NEC CORPORATION
发明人： KAIHARA, SHIGERU , TAKAHASHI, KEIICHI
IPC分类号： G02B6/293 , G02B6/34 , G02B6/38
摘要： In an optical coupler for dividing or combining lights of different wavelengths, at least one wavelength separating filter connector terminal is provided at least one light input and output terminals. The wavelength separating filter connector comprises first and second optical fibers which are in contact with each other by placing an optical wavelength separating filter film between the first and second optical fibers, so that an isolation is large between separated lights.

80. 发明专利

CA2016859A1 TELEPHONE 未知
公开(公告)号：CA2016859A1
公开(公告)日：1990-11-18
申请号：CA2016859
申请日：1990-05-15
申请人： NEC CORPORATION
发明人： TAMURA, YOSHIHARU
IPC分类号： H04M1/274 , H04M1/2745 , H04M1/56
摘要： A telephone having a display section, a key input section, and a dial memory storing a plurality of telephone numbers in association with labels representative of the names of subscribers such as individuals and companies. In a simple call origination mode, a display control reads some of the labels out of the dial memory and displays them together on the display section in a particular format which clearly shows the correspondence between keys provided on the key input section and the labels. When one of the labels appearing on the display section is selected on associated one of the keys, a call origination control originates a call by using a telephone number stored in the dial memory in association with the label having been selected.

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