专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPS598462A Mutual communication system of party line telephone 失效
标题翻译：党的电话互通系统
公开(公告)号：JPS598462A
公开(公告)日：1984-01-17
申请号：JP11667182
申请日：1982-07-05
申请人： Fujitsu Ltd , Hitachi Ltd , Nec Corp , Nippon Telegr & Teleph Corp , Oki Electric Ind Co Ltd
发明人： YOSHINO HARUYUKI , TATSUNO HIDEO , HOZUMI SHIGERU , HASEGAWA KOUICHI , OOTSUKI KANEICHI
IPC分类号： H04Q3/42 , H04M13/00 , H04M19/00 , H04Q5/00
CPC分类号： H04Q5/00
摘要： PURPOSE:To attain the communication without lowing a voice level, by bringing a channel current supply section to high impedance, and terminating in matching at a 2/4-wire converting section. CONSTITUTION:When a specific number from a telephone set 1 is detected 12- 17, a control circuit controls switches 6-9 to transmit a ringing signal of interphone 26 and to attain mutual calling between A and B telephone sets 1, 2. Further, switches 20, 21 for connection and disconnection of a 2/4-wire converting circuit 18 are controlled for opening to bring an impedance in terms of a voice frequency viewed from the telephone sets 1, 2 to a subscriber circuit 25 into a high level state. As a result, a call current is applied to the telephone sets 1, 2 from the subscriber circuit 25 and the subscriber circuit 25 to the voice is made to non-connecting state, allowing to prevent the decrease in the voice level.
摘要翻译：目的：通过使通道电流供应部分达到高阻抗，并且在2/4线转换部分终止匹配，来实现通信而不降低语音电平。构成：当检测到来自电话机1的特定号码12-17时，控制电路控制开关6-9发送对讲机26的振铃信号，并实现A和B电话机1,2之间的相互呼叫。另外，控制用于2/4线转换电路18的连接和断开的开关20,21用于打开以使从电话机1,2观察到的语音频率到用户电路25的阻抗成为高电平状态。结果，从用户电路25和用户电路25向电话机1,2施加呼叫电流，使语音成为非连接状态，从而可以防止语音电平的下降。

2. 发明专利

JPS645256A FEEDER CIRCUIT 失效
公开(公告)号：JPS645256A
公开(公告)日：1989-01-10
申请号：JP15985887
申请日：1987-06-29
申请人： OKI ELECTRIC IND CO LTD
发明人： SHIRAISHI OSAMU , HOZUMI SHIGERU
IPC分类号： H04M19/00
摘要： PURPOSE:To reduce the energy consumption of a feeder circuit and to optimize a tone volume from a telephone set by feeding the feeder current of a feeder circuit in terms of constant-current in case of a low line resistance. CONSTITUTION:Under the condition of a high resistance value of Z0, since a voltage VA between a terminal A and VBB and a voltage VB between a terminal B and an earth are low, IA and IB are low, the adding current (IA1+IB2) of the output IA1 of current mirror AA and the output IB2 of current mirror B through a current mirror AB are also low. When a Z0 lowers and VA and VB are respectively increased, an emitter, the base of a transistor QC, is biased in a forward direction, a VBE becomes constant, a first output current I2 and a second output power I1 become also constant. Consequently, the collector current of a transistors QA and QB becomes constant and also IL2 becomes constant equivalently.

3. 发明专利

JPH0373695A SUBSCRIBER CIRCUIT 失效
公开(公告)号：JPH0373695A
公开(公告)日：1991-03-28
申请号：JP20966889
申请日：1989-08-15
申请人： OKI ELECTRIC IND CO LTD
发明人： SHIRAISHI OSAMU , HOZUMI SHIGERU
IPC分类号： H04M19/00 , H04M1/74 , H04Q3/42
摘要： PURPOSE:To make it possible to remove also a common-mode induction noise with a large amplitude when the noise is applied by preparing a common-mode induction noise suppressing means obtained by connecting a capacitor to a non-linear element in series, connecting one end of the suppressing means to a line and connecting the other end to either one of a power supply and ground. CONSTITUTION:When a common-mode induction noise em whose operation voltage is lower than that of the common-mode induction noise suppressing circuit 2 occurs, a difference current of gain K4 between mirror circuits A1, A2 flows into a capacitor CC and a resistor RC. Thereby, a voltage change occurs on the input of an amplifier gm and a current proportional to the amplitude of the common-mode noise is outputted from the amplitude gm. The current is sent to adders 10, 12 and added to the current inputted from a terminal RX as an input to mirror circuits B1, B2. Consequently, a common-mode noise suppressing current i0 for increasing the output either one of the mirror circuits B1, B2 and reducing the output of the other circuit is outputted to a subscriber's line 100. Since a potential variation due to the common-mode noise is suppressed by the suppressing current i0, the noise of a differential part due to the potential variation of the subscriber's line is not transmitted to an output terminal TX.

4. 发明专利

JPH0681206B2 失效
公开(公告)号：JPH0681206B2
公开(公告)日：1994-10-12
申请号：JP15985887
申请日：1987-06-29
申请人： OKI ELECTRIC IND CO LTD
发明人： SHIRAISHI OSAMU , HOZUMI SHIGERU
IPC分类号： H04M19/00
摘要： PURPOSE:To reduce the energy consumption of a feeder circuit and to optimize a tone volume from a telephone set by feeding the feeder current of a feeder circuit in terms of constant-current in case of a low line resistance. CONSTITUTION:Under the condition of a high resistance value of Z0, since a voltage VA between a terminal A and VBB and a voltage VB between a terminal B and an earth are low, IA and IB are low, the adding current (IA1+IB2) of the output IA1 of current mirror AA and the output IB2 of current mirror B through a current mirror AB are also low. When a Z0 lowers and VA and VB are respectively increased, an emitter, the base of a transistor QC, is biased in a forward direction, a VBE becomes constant, a first output current I2 and a second output power I1 become also constant. Consequently, the collector current of a transistors QA and QB becomes constant and also IL2 becomes constant equivalently.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式