CN1228551A - Wireless computer connector and data transmission method - Google Patents
Wireless computer connector and data transmission method Download PDFInfo
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- CN1228551A CN1228551A CN 98106030 CN98106030A CN1228551A CN 1228551 A CN1228551 A CN 1228551A CN 98106030 CN98106030 CN 98106030 CN 98106030 A CN98106030 A CN 98106030A CN 1228551 A CN1228551 A CN 1228551A
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Abstract
The present invention relates to a wireless computer connector and its data transmission method. After the digital signal is used to make amplitude key modulation to high frequency carrier, it can be transmitted out, then it is received by super-regenerated receiving circuit adopted in its receiving end, undergone the processes of amplification, processing and reduced into the digital signal. This transmission mode solves the defects produced in wire transmission or infrared wireless transmission mode for signal transmission between traditional seat machine and PC machine, and features low cost, reliable performance and convenient use, etc..
Description
The present invention relates to computer connector, relate in particular to and be applicable to that portable PDA (personal digital assistant) and individual beeper and computer carry out the wireless computer connector that bi-directional data transmits.
At present, wired and wireless dual mode in base and the transmission of PC signal, and wireless transmission method is wherein realized with infrared and reception.Need aim at specific direction when this mode exists transmission and realize the high shortcoming of cost.And wire transmission mode can since the oxidation of metal surface, contact spring distortion or surface in contact by contamination and loose contact.In a word, existing these two kinds of transmission modes have all been brought inconvenience to the user.Thereby, the purpose of this invention is to provide a kind of dependable performance, wireless computer connector with low cost, easy to use.
In order to realize above purpose, the invention provides a kind of wireless computer connector, comprising:
The Transmit-Receive Unit of PDA side, it is characterized in that comprising: the receiving circuit of forming by the induction receiving coil, bandpass filter, amplifier, wave detector, the pulse shaping circuit that connect successively, with by the frequency mixer that is connected successively with launch the radiating circuit that inductive coil is formed;
The Transmit-Receive Unit of base side, it is characterized in that comprising: the receiving circuit of forming by the induction receiving coil, bandpass filter, amplifier, wave detector, the pulse shaping circuit that connect successively, with the radiating circuit of being made up of the frequency mixer that is connected successively, emission inductive coil, wherein the output of the input of radiating circuit and receiving circuit links to each other with computer by the wave amplitude converter of RS232C to TTL signal wave.
Owing between base and mobile phone, carry out data transmission and need not to have made things convenient for the user, and owing to adopted wireless transmit and receive mode, make dependable performance, easy to use, phenomenon that loss of data or transmission interruption can not take place with traditional connection mode.Wireless transmission method has saved the expensive components in the infrared ray transmitting-receiving, has reduced cost.
For advantage of the present invention, feature are had clearer understanding, below with reference to accompanying drawings, the present invention is carried out more detailed description at preferred implementation, in the accompanying drawing:
Fig. 1 is the theory diagram of wireless computer connector of the present invention;
Fig. 2 is the circuit diagram of wireless computer connector personal digital assistant side;
Fig. 3 is the circuit diagram of wireless computer connector base side;
Fig. 1 is the theory diagram of wireless computer connector of the present invention.With reference to Fig. 1, computer connector of the present invention comprises two parts: base side and personal digital assistant's side.The base side comprises two parts again: receiving circuit part and radiating circuit part.When the user wants from the past personal digital assistant's side transmission of computer data, as shown in Figure 1, the data of coming from computer enter level translator 9, and the data level of computer and the signal level of circuit are adapted, and level translator wherein can be RS232C to a TTL signal level converter for example.Send into frequency mixer 3 from the signal of level translator output, mix mutually with high-frequency modulation signal from oscillator 2, wherein the oscillation frequency of oscillator 2 is 6MHz or 8MHz, the modulation that frequency mixer carries out is the amplitude keying modulation, high-frequency signal output is arranged when signal is " 1 ", when signal is " 0 ", do not have high-frequency signal output.Certainly, those skilled in the art should be able to understand that the frequency of oscillator can be other frequency, and modulation system can not have high-frequency signal output etc. for high-frequency signal output is arranged yet when signal is " 0 " when signal is " 1 ".Signal after the modulation is launched through inductive coil 1.Can be received by personal digital assistant from the signal of inductive coil 1 emission.Continuation is with reference to Fig. 1, and inductive coil 11 interceptings of personal digital assistant side are sent into acceptance filter 12 with the unnecessary signal of filtering from the signal of inductive coil 1 emission.The output of acceptance filter 12 is sent into wave detector 14 after amplifier 13 amplifies.Wave detector carries out demodulation to the signal of input, obtains the data-signal that needs.Data-signal is sent into microprocessor after whole ripple device 15 shapings.Through such process, data have just been finished from the transmission of computer to the personal digital assistant side.
The user sends data from personal digital assistant's side toward computer process will be described below.As shown in Figure 1, send into frequency mixer 17 from the data that the microprocessor of personal digital assistant side is next, carry out mixing with the modulation signal of oscillator 18 outputs, wherein the oscillation frequency of oscillator 18 is 6MHz or 8MHz, high-frequency signal output is arranged when signal is " 1 ", when signal is " 0 ", do not have high-frequency signal output.Certainly, those skilled in the art should be able to understand that the frequency of oscillator can be other frequency, and modulation system can not have high-frequency signal output etc. for high-frequency signal output is arranged yet when signal is " 0 " when signal is " 1 ".Signal after the modulation is sent out through inductive coil 16.The signal that sends from inductive coil 16 is received by the induction receiving coil 4 of base side then.The signal that induction receiving coil 4 receives is given acceptance filter 5, the signal in the filtering inoperative frequency band.The output of acceptance filter is given wave detector 7 after amplifier 6 amplifies, the output of wave detector 7 is given RS232C to TTL signal level converter after the shaping of whole ripple device 8 is handled, so that data adapt in the data level of delivering to before the computer with computer, so just finished the transmission of data from the past base side of personal digital assistant side.In addition, can save the oscillator 18 of personal digital assistant side, and directly obtain high-frequency modulation signal, can reduce the cost of circuit like this from the clock of the microprocessor of personal digital assistant side.
Continuation is with reference to Fig. 1, and wireless computer connector of the present invention also comprises a power regulator 10 in the base side, is used for stablizing the output voltage of external transformer (not shown).Certainly, in the present invention, the base side can directly be powered by the control signal wire in the RS232 interface, thereby can save external transformer and power regulator 10.Wireless computer connector of the present invention also comprises an electric power controller 19 in the personal digital assistant side, is used for cutting off when wireless computer connector is in off working state the power supply of circuit, to reduce electrical source consumption.
Fig. 2 is the circuit diagram of wireless computer connector personal digital assistant side, and it is that the circuit of the theory diagram of wireless computer connector personal digital assistant side shown in Figure 1 is realized.As shown in Figure 2, the induction receiving coil 11 of the personal digital assistant side among Fig. 1 is an inductance L 1, an end ground connection of inductance L 1, the input end of other end tape splicing bandpass filter 12.The bandpass filter here is the RC network wave filter, forms a RC bandpass filter by a RC Hi-pass filter and a RC low-pass filter.Those skilled in the art should be able to understand, here also can be with the wave filter of other type, as LC network filter etc.The output of bandpass filter is coupled to the input end of amplifier 13 by a capacitor C 6, and cross-over connection has a resistance R 7 between amplifier input terminal and the output terminal.The output of operational amplifier by a diode detection circuit 14 after in turn the phase inverter by two serial connections carry out sending into interface arrangement RXD after the shaping.See the transtation mission circuit part of digital assistants side again, the signal from microprocessor is received the base stage of PNP mixing triode Q3 by resistance R 14 in by resistance R 15 ground connection, and the emitter of mixing triode meets power vd D.Signal from local oscillator is through being added to the collector of triode after the resistance R 12, and be added to the input end 13 of inverting amplifier UIF simultaneously, signal is launched inductive coil 16 parts through delivering to after a capacitor C 10 and the resistance R 13 after 12 outputs of inverting amplifier UIF output terminal, promptly inductance L 2 sends.Square frame 19 among Fig. 2 shows electric power management circuit.Its circuit working principle is: in normal operation, signal ALM is in high level state, then control tube Q2 opens, the collector of control tube Q2 is in the closely low level state of level, thereby the base stage of switching tube Q1 also is in low level state, therefore switching tube Q1 leads to, and then supply voltage VBAT outputs to VDD1 by the Q1 pipe, the work of power supply road.Be in off working state when detecting personal digital assistant, promptly signal ALM is in low level, and then control tube Q2 closes, and the collector of Q1 is in the high level state near supply voltage VBAT, and switching tube Q1 closes, and VDD1 is output services voltage not.Physical circuit connects as shown in the figure, the base stage that resistance R 1 and the R2 of signal ALM by series connection receives control tube Q2, and the tie point of R1 and R2 disturbs to eliminate low-frequency pulse also by an electrochemical capacitor C1 ground connection simultaneously, prevents circuit erroneous action.The base stage of switching tube Q1 is received in the grounded emitter of control tube Q2, collector by resistance R 4.The emitter of switching tube Q1 links to each other with power supply VBAT, and between emitter and base stage cross-over connection a resistance R 3.The collector output services voltage VDD1 of switching tube Q1 is to operating circuit.Also be connected to an electrochemical capacitor C2 and a ceramic condenser C3 between the collector of switching tube Q1 and the ground, be used for filtering low-frequency disturbance and high-frequency interferencing signal respectively.What those skilled in the art should be able to understand is, though control tube Q2 that draws among the figure and switching tube Q1 are respectively NPN transistor pipe and PNP transistor, in fact they can also be the pipe of other type.
Fig. 3 is the circuit diagram of wireless computer connector base side, and it is the circuit realization of the wireless computer connector base side theory diagram of Fig. 1.As shown in Figure 3, the radiating portion of this part circuit is the same respectively with the radiating portion and the receiving unit of personal digital assistant side with receiving unit, here just is not described in detail.Here used power supply stabilization circuit also can be any known power supply stabilization circuit, therefore also is not described in detail.About the level shifting circuit of RS232 to TTL, in accompanying drawing disclosed, therefore those skilled in the art obviously can also realize other a lot of circuit, because this also is known in this area, also no longer this is explained in detail here.
Again the using method of wireless computer connector of the present invention is described below.
1, base machine transplanting of rice seat is connected to the PC interface, supplies power to base through attaching plug again;
2, enter the application software of computer connector in PC, then PDA or individual beeper are positioned on the base;
3,, select corresponding reception/output function to perform transmission by corresponding document then and prepare in PDA or individual beeper entry communication catalogue;
4, the transmission of all documents is carried out with wireless mode entirely, and after transmission was finished, the user only needs PDA or individual beeper mentioned from base just could.
Claims (10)
1, a kind of wireless computer connector comprises:
The Transmit-Receive Unit of PDA side, it is characterized in that comprising: the receiving circuit of forming by the induction receiving coil, bandpass filter, amplifier, wave detector, the pulse shaping circuit that connect successively, with by the frequency mixer that is connected successively with launch the radiating circuit that inductive coil is formed;
The Transmit-Receive Unit of base side, it is characterized in that comprising: the receiving circuit of forming by the induction receiving coil, bandpass filter, amplifier, wave detector, the pulse shaping circuit that connect successively, with the radiating circuit of being made up of the frequency mixer that is connected successively, emission inductive coil, wherein the output of the input of radiating circuit and receiving circuit links to each other with computer by the wave amplitude converter of RS232C to TTL signal wave; Wherein,
Be coupled by inductive coil between the transmitter unit of the receiving element of the receiving element of the transmitter unit of PDA side and base side and PDA side and base side.
2, wireless computer connector as claimed in claim 1 is characterized in that: the frequency of operation of described radiating circuit is 6MHz or 8Mhz.
3, wireless computer connector as claimed in claim 1 is characterized in that: the modulation system of described radiating circuit is the amplitude keying modulation.
4, wireless computer connector as claimed in claim 1 is characterized in that: the transmitting-receiving power supply of described PDA side also comprises an electric power management circuit, is used for disconnecting when described PDA does not work working power.
5, as claim 1,2,3 or 4 wireless computer connector is characterized in that: the used high-frequency modulation signal of the frequency mixer of described PDA side is that the clock by the microprocessor of described PDA provides.
6, a kind of method of carrying out data transmission between computer and PDA(Personal Digital Assistant) comprises the following steps:
In the direction from the base to PDA:
1) data is delivered to base from computer, after level conversion, send into modulating circuit modulates, and then send by transmitting coil;
2) signal of described transmission is received by the receiving coil of PDA side, sends into the microprocessor of PDA after amplification, demodulation;
In the direction from PDA to the base:
1) data is sent into modulating circuit modulates from the microprocessor of PDA, send by transmitting coil then;
2) signal of described transmission by the receiving coil of base side receive, through amplification, demodulation and after level conversion, send into computer.
7, data transmission method as claimed in claim 6 is characterized in that: described modulation is to modulate with the frequency of 6MHz or 8MHz.
8, data transmission method as claimed in claim 6 is characterized in that: the described amplitude keying that is modulated to is modulated.
9, data transmission method as claimed in claim 6 is characterized in that also comprising the step that disconnects the working power of described PDA side when described PDA does not work.
10, as claim 6,7,8 or 9 data transmission method is characterized in that: the used high-frequency modulation signal of described modulation is that the clock by the microprocessor of described PDA provides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98106030 CN1228551A (en) | 1998-03-05 | 1998-03-05 | Wireless computer connector and data transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98106030 CN1228551A (en) | 1998-03-05 | 1998-03-05 | Wireless computer connector and data transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1228551A true CN1228551A (en) | 1999-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98106030 Pending CN1228551A (en) | 1998-03-05 | 1998-03-05 | Wireless computer connector and data transmission method |
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| Country | Link |
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| CN (1) | CN1228551A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419809C (en) * | 2005-12-30 | 2008-09-17 | 华为技术有限公司 | Fee charging signal conversion control circuit |
| CN109804516A (en) * | 2016-08-26 | 2019-05-24 | 纽卡润特有限公司 | Wireless connector system |
-
1998
- 1998-03-05 CN CN 98106030 patent/CN1228551A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419809C (en) * | 2005-12-30 | 2008-09-17 | 华为技术有限公司 | Fee charging signal conversion control circuit |
| CN109804516A (en) * | 2016-08-26 | 2019-05-24 | 纽卡润特有限公司 | Wireless connector system |
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