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1. 发明专利

JPS6248198A LOOP DETECTING CIRCUIT 失效
公开(公告)号：JPS6248198A
公开(公告)日：1987-03-02
申请号：JP18785385
申请日：1985-08-27
申请人： FUJITSU LTD
发明人： AYANO MITSUTOSHI , IKETANI YOZO , TOJO TOSHIRO , TAKATO KENJI , SHIBUYA KIYOSHI
IPC分类号： H04Q3/72
摘要： PURPOSE:To prevent an erroneous detection and extend the length of a subscriber's line by providing a variable threshold forming means for forming a threshold changing according to a loop current supplied to a subscriber's line and a comparison means for comparing the loop current with the threshold outputted by the variable threshold forming means. CONSTITUTION:When a telephone set is in a state of an on hook, since an output voltage VO is lower than a dividing potential Vd, a diode 18 is interrupted, a threshold voltage VTH transmitted to an arithmetic amplifier 11 is equal to the dividing potential Vd. Then, when the telephone set 5 is in a state of an off-hook, the output voltage VO is raised according to a loop current IL, the diode 18 is conductive, and the threshold voltage VTH becomes higher than the dividing potential Vd. The degree of raising is increased and decreased according to the loop current IL. Accordingly, when a resistance of a subscriber's line is minimum, the threshold voltage VTH is completely raised and an erroneous detection of a flyback waveform generated on receiving a dial pulse can be prevented. When the resistance of the subscriber's line is an allowable maximum value, the threshold voltage VTH is not increased according to the loop current, so that the dial pulse can be effectively detected.

2. 发明专利

JPS61285854A RINGER SIGNAL DEVICE 失效
公开(公告)号：JPS61285854A
公开(公告)日：1986-12-16
申请号：JP12732885
申请日：1985-06-12
申请人： FUJITSU LTD
发明人： IKETANI YOZO , AYANO MITSUTOSHI , SHIBUYA KIYOSHI , ITO SHINICHI , SATO TAKASHI
IPC分类号： H04M3/02
摘要： PURPOSE:To simplify the circuit and to minimize the converting loss by using a photo triode AC switch, a zero cross detecting circuit, a phase control circuit and a smoothing circuit and making a ringer signal from AC 100V of 50Hz directly to 25Hz. CONSTITUTION:The device has photo tride AC switches 1N, 2R, 2N and 2R, a zero cross detecting circuit 3, a phase control circuit 4 and a smoothing circuit. Any of photo triode AC switches used are set so that terminals (c)-(d) come to be the conductive condition when an ON signal is impressed between terminals (a)-(b), and terminals come to be the open condition when an OFF signal is impressed. AC 100V, (50Hz) is impressed between input terminals IN, the waveform of AC 100V is inputted into a zero cross detecting circuit 3, the point is detected in which the waveform crosses with the line of the electric power source zero, the waveform is classified four phases, namely, (i), (ii), (iii) and (iv), and these classifying signals are outputted to the phase control circuit 4. As the result, the ringer signal of 25Hz is obtained at the output side of the smoothing circuit 5.

3. 发明专利

JPS61281665A INTRA-BAND HOWLER SENDING SYSTEM 失效
公开(公告)号：JPS61281665A
公开(公告)日：1986-12-12
申请号：JP11739285
申请日：1985-05-30
申请人： FUJITSU LTD
发明人： SATO TAKASHI , AYANO MITSUTOSHI , TAKATO KENJI , TOJO TOSHIRO , IKETANI YOZO
IPC分类号： H04M19/02
摘要： PURPOSE:To obtain easily a signal with a large amplitude and including a large quantity of high frequencies and to use effectively as a howler sound even when the constitution is comparatively simple by storing a rectangular wave signal of the maximum coding level at the memory to store the signal tone sent from the telephone exchange as the digital signal. CONSTITUTION:In the intra-band howler sending system to be provided with a memory (ROM 3) to store, as a digital signal, the signal tone sent from the telephone exchange for subscriber telephone sets 41, 42..., to read the storing signal of said memory (ROM 3), to execute a D/A conversion and to send the howler signal in an audible frequency band, the rectangular wave signal of the maximum coding level is stored to the memory (ROM 3). Since the signal is made into the rectangular wave signal as complete as possible as the signal for storing to the memory ROM 3, when the signal is read and converted to the analog signal, the value close to Im is in many cases obtained. Namely, the effective value output comes to be close to Im, the level of the signal for the howler comes to be higher, and the sound including more higher harmonics than the sine wave can be obtained.

4. 发明专利

JPS61276459A RESERVATION DISPLAY TELEPHONE SYSTEM 失效
公开(公告)号：JPS61276459A
公开(公告)日：1986-12-06
申请号：JP11805085
申请日：1985-05-31
申请人： FUJITSU LTD
发明人： TAKATO KENJI , TOJO TOSHIRO , IKETANI YOZO , AYANO MITSUTOSHI , SHIBUYA KIYOSHI
IPC分类号： H04M1/57 , H04M3/42
摘要： PURPOSE:To give the right of talking start to the called party by providing a reception circuit and a control circuit or the like for a polarity inverting pulse or an MF signal to a telephone set and allowing a converter to transfer a caller data to a called party according to a signal from a subscriber in the form of a polarity inversion pulse or an MF signal thereby informing the presence of a call and its content to the called party. CONSTITUTION:The telephone number of a caller is sent in the form of a polarity inversion pulse of an MF signal by the hooking-off of a telephone set. The signal is received by a reception circuit 4a and stored in an additional memory 8a. A control circuit 6a reads a signal stored in the memory 8a, inputs the signal to a latch circuit 10 and displays on a display device 12 via a drive circuit 11 or raises a buzzer 13 to inform the incoming call to a called party. Further, the control circuit 6a lights a lamp 7a in a button matrix when the telephone number of the caller stored in the additional memory is a telephone number stored in the memory 8. Thus, it is possible for the called party to reply or not depending on its convenience.

5. 发明专利

JPS61216531A TWO-WIRE AND FOUR-WIRE CONVERTING CIRCUIT 失效
公开(公告)号：JPS61216531A
公开(公告)日：1986-09-26
申请号：JP3320485
申请日：1985-02-21
申请人： FUJITSU LTD
发明人： AYANO MITSUTOSHI , SHIBUYA KIYOSHI , ITO SHINICHI , SATO TAKASHI , TAKATO KENJI
IPC分类号： H04B3/03 , H04B1/58 , H04Q3/42
摘要： PURPOSE:To decrease the number of constituent elements greatly and to accelerate the economization and size reduction of a subscriber circuit by setting the impedance values of the 3rd and the 1st impedance elements equal to each other or N times as large as it, and setting the impedance value of the 5th impedance element equal to or N times as large as the impedance value of a two-wire circuit. CONSTITUTION:The impedance value of a two-wire subscriber circuit which is viewed from two-wire terminals 2A and 2B is denoted as Z2, impedance values of impedance elements 31-34 are equalized to Z1, and impedance values of impedance elements 35-37 are set to Z2. Consequently, the two-wire and four-wire converting circuit is constituted by using only two operational amplifiers 22 and 23 and five impedance elements 31-36 so that a voltage Vzi inputted to the two-wire terminals 2A and 2B is transmitted to a four-wire transmission output terminal 4F and a voltage V4i applied to a four-wire reception input terminal 4B is transmitted to the two-wire terminals 2A and 2B without being transmitted to the four-wire transmission output terminal 4F.

6. 发明专利

JPS61214771A NOISE REMOVING FILTER CIRCUIT 失效
公开(公告)号：JPS61214771A
公开(公告)日：1986-09-24
申请号：JP5539685
申请日：1985-03-19
申请人： FUJITSU LTD
发明人： TOJO TOSHIRO , SHIBUYA KIYOSHI , AYANO MITSUTOSHI , ITO SHINICHI , TAKATO KENJI
IPC分类号： H02M1/14
摘要： PURPOSE:To improve the operating efficiency and the certainty of a circuit operation by monitoring the voltage across a capacitor of a noise removing filter by a relay, and controlling to shortcircuit a resistor by ON or OFF of its relay contact. CONSTITUTION:A noise removing filter which has a resistor 3 and a capacitor 4 is connected with a power source 1 in parallel with a load 2. In this case, a relay 8 is provided across the capacitor 4, and the resistor 3 is controlled to be shortcircuited by the ON or OFF of a relay contact 9. Thus, when the power source 1 is turned ON, the capacitor 4 is gradually charged through the resistor 3, and when the voltage across it becomes the prescribed value or higher, the relay 8 is operated to close the contact 9, thereby shortcircuiting the resistor 3. Thus, only the capacitor 4 remains to enhance the filter effect.

7. 发明专利

JPS61173563A TEST CONNECTION SYSTEM FOR SUBSCRIBER CIRCUIT 失效
公开(公告)号：JPS61173563A
公开(公告)日：1986-08-05
申请号：JP1471885
申请日：1985-01-29
申请人： FUJITSU LTD
发明人： TOJO TOSHIRO , IKETANI YOZO , AYANO MITSUTOSHI , SHIBUYA KIYOSHI , ITO SHINICHI
IPC分类号： H04M3/30
摘要： PURPOSE:To promote the size reduction of a subscriber circuit package by providing a test arrester spring to the channel of a subscriber circuit, and inserting a test plug into the arrester spring and connecting at least either a corresponding subscriber circuit or a subscriber line to a testing circuit. CONSTITUTION:When a testing operator inserts the test plug 7 into the arrester spring 36, contact springs 37a and 38a and contact springs 37b and 38b leave each other and an internal circuit 32 is disconnected from a subscriber line 2, etc. The test plug 7, on the other hand, is provided with contact conductor pieces 71a and 71b connected to a testing circuit 4 through a test channel 61 and contact conductor pieces 72a and 72b connected to a testing circuit 5 through a test channel 61 and plug is inserted into the arrester spring 36, so that it contacts the contact springs 37a and 37b or 38a and 38b respectively. Consequently, the internal circuit 32 is connected to the testing circuit 4 through channels 31a and 31b, contact springs 37a and 37b, and contact conductor pieces and test channel 61, and the subscriber line 2, etc., are connected to the test circuit 5 through the contact springs 38a and 38b, contact conductor pieces, and test channel 62.

8. 发明专利

JPS61145947A RING TRIP CIRCUIT 失效
公开(公告)号：JPS61145947A
公开(公告)日：1986-07-03
申请号：JP26792884
申请日：1984-12-19
申请人： FUJITSU LTD
发明人： AYANO MITSUTOSHI , SHIBUYA KIYOSHI , ITO SHINICHI , SATO TAKASHI , TAKATO KENJI
IPC分类号： H04M3/06
摘要： PURPOSE:To promote miniaturizing and economical effects of a digital exchange by providing a means that generates a different DC voltage when a called telephone made a reply in plural subscribers' circuits and making ring trip operation for plural subscriber's circuits in common by discriminating the DC voltage. CONSTITUTION:A constant voltage diode 20 is provided in a call signal supply route as a device to generate a different DC voltage when a called telephone made a reply, and comparators 171, 172 and a gate 26 are provided in a ring trip circuit provided in common in subscribers' circuits 01, 02 as a means for discriminating DC voltage generated in each subscriber's circuit. The comparator 171 outputs a reset signal when a telephone set 11 changed from on-hook state to off-hook state, and the comparator 172 outputs a reset signal when either of telephone sets 11, 12 changed from on-hook state to off-hook state. By the ring trip circuit provided in common, it becomes possible to send out or stop a call signal when either of telephone sets 11 or 12 changed from on-hook state to off-hook state.

9. 发明专利

JPS611159A CONSTANT CURRENT FEEDING CIRCUIT OF SUBSCRIBER CIRCUIT 失效
公开(公告)号：JPS611159A
公开(公告)日：1986-01-07
申请号：JP12066784
申请日：1984-06-14
申请人： FUJITSU LTD
发明人： TOUJIYOU TOSHIROU , AYANO MITSUTOSHI , TAKATOU KENJI , SATOU TAKASHI , IKETANI YOUZOU
IPC分类号： H04M19/00
摘要： PURPOSE:To decrease power consumption at on-hook by connecting respectively a series circuit comprising a resistor and a photocoupler between a non-inverting output of the 1st and 2nd operational amplifiers and an output of the 3rd operational amplifier. CONSTITUTION:When channels B, A are closed, the off-hook state is detected via a transformer T and control signals S1, S2 of logical 1 are outputted from a drive circuit DR. Thus, the primary side of the photocouplers PC1, PC2 is lighted and the secondary side is conducted by photocoupling. In such a case, voltages VA, V1, V2 are generated, currents IB, IA flow to the channels B, A, a midpoint voltage between the channels B and A is biased and kept constant. In case of on-track, the control outputs S1, S2 of the drive circuit DR are lost, the LED of the couplers PC1, PC2 is extinguished. Thus, the output voltage VA of the operational amplifier A3 is not fed to the non-inverting input of the operational amplifiers A1, A2. Thus, no current flows to the amplifiers A1, A2.

10. 发明专利

JPS6041866A SEMI-CONSTANT CURRENT FEEDING CIRCUIT 失效
公开(公告)号：JPS6041866A
公开(公告)日：1985-03-05
申请号：JP14985683
申请日：1983-08-17
申请人： FUJITSU LTD
发明人： ITOU SHINICHI , AYANO MITSUTOSHI , SHIBUYA KIYOSHI , HASHIMOTO YOSHITO , TOUJIYOU TOSHIROU
IPC分类号： H04M19/00
摘要： PURPOSE:To eliminate any special consideration as to the dielectric strength for mounting by separating completely a DC current suply circuit connected to a subscriber line while keeping the circuit symmetrically spaced to the upper and lower parts. CONSTITUTION:When a line resistance up to a subscriber telephone set TEL is small, the voltage drop of a resistor R1 is increased, a voltage at the positive input of an operational amplifier OP1 is reduced and collector current of a transistor (TR1), i.e., supply current I is increased. When the supply current I is increased to a certain value, however, that is, the positive input voltage of the operational amplifier OP1 is decreased to a value, then a forward voltage impressed to a diode D1 is larger, the current is increased rapidly, the terminal voltage of the diode D1 is made almost constant, resulting that the positive input voltage of the operational amplifier OP1 is made almost constant and then the supply current I is made almost constant. The similar operation is conducted as to the lower half circuit and the semi-constant current characteristic is realized by the cooperation of both circuits.

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