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1. 发明专利

JPS6462935A FREQUENCY CONVERSION METHOD 失效
公开(公告)号：JPS6462935A
公开(公告)日：1989-03-09
申请号：JP21980987
申请日：1987-09-02
申请人： TOYO COMMUNICATION EQUIP
发明人： HONDA TAKAYOSHI
IPC分类号： H03H7/00 , H04L12/00 , H04L12/28 , H04L12/40 , H04N7/16
摘要： PURPOSE:To eliminate the frequency conversion error between frequency converters, by providing a local oscillation circuit only to a head end device of a local area network and inputting an oscillation frequency of the local oscillation circuit to the frequency converter of each equipment via a trunk line. CONSTITUTION:In transmitting a data from a terminal equipment 20 to a terminal equipment 30, a base band signal from the equipment 20 is superimposed on a carrier by an interface device 21 and converted into a prescribed frequency 20a by a frequency converter 22. In this case, the local oscillation frequency for the conversion is supplied from the oscillator 12 provided on the head end device 10 to the frequency converter 11 of the equipment 10 and converted into a sending frequency 30a0 of the interface device 31 in the device 30 and then inputted to the device 10. The carrier subjected to frequency conversion is propagated through the line 1 and given to the terminal equipment 30.

2. 发明专利

JPS61265905A TWO-FREQUENCY SHARED ANTENNA 失效
公开(公告)号：JPS61265905A
公开(公告)日：1986-11-25
申请号：JP10788585
申请日：1985-05-20
申请人： TOYO COMMUNICATION EQUIP
发明人： HONDA TAKAYOSHI
IPC分类号： H01Q5/00 , H01Q5/10 , H01Q5/328 , H01Q5/335 , H01Q5/35 , H01Q7/00
摘要： PURPOSE:To attain light weight and small size of a radio transmission/reception equipment by adding respectively a tuning circuit to each end of a loop antenna and constituting each of a tunning circuit so as to form the synthesized resonance frequency for the loop antenna and the tuning circuit into two different frequencies thereby sharing one loop antenna for different frequencies. CONSTITUTION:Series-parallel resonance circuits, 3, 3' comprising a coil L1, capacitors C1, C2 and a coil L2, capacitors C3, C4 respectively are connected to both ends 2, 2' of the loop antenna element 1. Further, the resonance frequency of the two resonance circuits 3, 3' and the loop antenna element 1 in total three components is two desired frequencies f1, f2 and the circuit element is decided so that the impedance of input/output terminals 4, 4' tapped down by capacity division of the resonance circuits 3, 3' becomes the input/output impedance of the transmission reception circuit to be connected to them, e.g., 50OMEGA. Thus, in connecting a receiver of the reception frequency f1 to the input/ output terminal 4 of the resonance circuit 3 and the transmitter using the transmission frequency f2 of the resonance circuit 3' respectively, one antenna is used as the shared antenna of the transmission and reception equipment having different frequencies from each other.

3. 发明专利

JP2579496B2 失效
公开(公告)号：JP2579496B2
公开(公告)日：1997-02-05
申请号：JP21980987
申请日：1987-09-02
申请人： TOYO COMMUNICATION EQUIP
发明人： HONDA TAKAYOSHI
IPC分类号： H03H7/00 , H04L12/00 , H04L12/28 , H04L12/40 , H04N7/16

4. 发明专利

JPH0257033A CABLE NETWORK COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0257033A
公开(公告)日：1990-02-26
申请号：JP20869088
申请日：1988-08-23
申请人： TOYO COMMUNICATION EQUIP
发明人： HONDA TAKAYOSHI , MURATA AKIHISA
IPC分类号： H04L12/40
摘要： PURPOSE:To execute communication even between plural terminal stations by providing a frequency shift transmission part and a frequency shift reception part in each terminal station, shifting the frequency of a transmission signal and sending the signal on a cable when the communication is executed between the terminal stations. CONSTITUTION:A terminal station 1a is provided with a terminal part 5 to execute the selection of a multi-channel, the selection of the opposite station, the generation of a calling signal, the regeneration of the calling signal or the detection of an idle channel, etc., at the time of transmission/reception and an HF switching part 6 to execute communication processing by a normal calling channel or a shift calling channel. When the communication is executed with a master station 36, the opposite station is selected by using a control channel. After that, the communication is executed by using one of the second-tenth normal calling channels allocated as a communication band between master and slave stations. When the communication is executed with one of other terminal stations 1b..., the opposite station is selected by using the control channel. After that, the communication is executed by using one of the second-tenth shift calling channels allocated as a communication band between slave stations.

5. 发明专利

JPS60165130A EXTENSION CONNECTING COMMUNICATION SYSTEM 失效
公开(公告)号：JPS60165130A
公开(公告)日：1985-08-28
申请号：JP2127484
申请日：1984-02-07
申请人： TOYO COMMUNICATION EQUIP
发明人： NANBA HIROMICHI , HONDA TAKAYOSHI
IPC分类号： H04B1/40 , H04B7/26 , H04M1/00
摘要： PURPOSE:To allow a radio equipment of a slave station and a radio equipment of other slave station to communicate directly by providing a means for replacing a transmission frequency and a reception frequency of a required part of a radio equipment of a slave station oppositely to those of a radio equipment of other station. CONSTITUTION:Two oscillating circuits having channel frequencies of f1 and f2 respectively are provided to a transceiver and they are switched by changeover switches SW1, SW2 interlocked with the transmission and reception section. When the radio equipments 4, 5 of slave stations communicate with each other, the channel frequency of the radio equipment of either slave station of the both is switched and the transmission frequency is taken as f1 and the reception frequency is taken as f2, then the direct communication between the two slave stations is attained. As the method expanding the range as shown in a large circuit of radius R, a threshold value in an outer line talking connection where the S/N of a received output is detected for >=20dB and it is regarded as the presence of an incoming call is decreased to 10dB in the extension connection or the transmission output is increased.

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