Onhook/offhook controller for intelligent telephone
A technology of control device and smart phone, which is applied in the direction of telephone communication, electrical components, subscriber special services, etc. It can solve the problems of large size, poor safety performance, and large volume of dual audio transformers, so as to meet the level requirements and ensure normal operation. , cost reduction effect
Inactive Publication Date: 2005-03-16
TSINGHUA UNIV +1
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Problems solved by technology
However, the dual-audio transformer is large in size, and there is no mass production in China, so it needs to be customized or ordered from abroad.
Therefore, the existing off-hook control device for smart phones has the problems of high cost, large volume, or poor safety performance, which may damage the equipment of the telephone office and adversely affect the telephone network.
In the prior art, variable resistors are often connected in the circuit to adjust the resistance of the system, and in order to achieve the purpose of precisely adjusting the resistance, multiple variable resistors can be connected in series or parallel to better meet the requirements of the system. However, this low-cost, easy-to-use, and precisely adjusted load regulation circuit has not been applied in the field of telephone remote control.
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[0011] Referring to the accompanying drawings, the circuit of the on-hook control device of the smart phone includes a bridge rectifier 1 composed of a diode one D5, a diode two D6, a diode three D7 and a diode four D8, a relay 2, a PNP transistor 7, an NPN transistor 6 , Diode 5 D9, resistor 1 R16, resistor 2 R17 and resistor 3 R18 are composed of an overvoltage protection circuit 3, a load adjustment circuit 4 composed of resistor 4 R19, resistor 5 R20, resistor 6 R21, resistor 7 R22 and the model is AT89C51 Microcontroller5. Telephone lines a and b are connected to bridge rectifier 1, the negative terminal of bridge rectifier 1 is grounded, the positive terminal is connected to pin 2 of relay 2, pin 4 of relay 2 is connected to overvoltage protection circuit 3, and overvoltage protection circuit 3 is connected in parallel to the load adjustment circuit 4. Pin 1 of the relay 2 is connected to the data bus P2.7 of the single-chip microcomputer 5, and the single-chip microcomp...
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The device consists of bridge rectifier, relay and monolithic computer as phone line a and 6 are connected with the bridge rectifier which its negative end is connected to earthing and its positive end to foot 2 of the relay as well as foot, of the relay is connected with the monolithic computer. It is mainly applied in remote control device of the intelligent phone.
Description
technical field [0001] The invention relates to an off-hook control device for a smart phone, which belongs to the field of remote control of smart phones. Background technique [0002] The existing smart phone off-hook control technology usually uses a dual-tone transformer to adjust the resistance value of the smart phone connected to the telephone network, so that its impedance and loop current meet the requirements of the national standard telephone network. However, the dual-audio transformer is large in size, and there is no mass production in China, so it needs to be customized or ordered from abroad. Therefore, the existing off-hook control device for smart phones has the problems of high cost, large volume, or poor safety performance, which may damage the equipment of the telephone office and adversely affect the telephone network. In the prior art, variable resistors are often connected in the circuit to adjust the resistance of the system, and in order to achieve...
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IPC IPC(8): H04M3/42H04M11/00
Inventor 杨士元叶朝辉唐光荣潘龙季彩虹阿木古郎
Owner TSINGHUA UNIV