CN87202675U - Device controlling to receive data transmission - Google Patents
Device controlling to receive data transmission Download PDFInfo
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- CN87202675U CN87202675U CN 87202675 CN87202675U CN87202675U CN 87202675 U CN87202675 U CN 87202675U CN 87202675 CN87202675 CN 87202675 CN 87202675 U CN87202675 U CN 87202675U CN 87202675 U CN87202675 U CN 87202675U
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- circuit
- data transmission
- signal
- demodulator
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Abstract
The utility model discloses a device controlling to receive data transmission, being used for improving the receiving performance of the data transmission. When conducting the data transmission, the device can ensure that the device accurately receives the transmitted data according to the requirement of the transmission rate. The device is connected to the receiving line of the modulator-demodulator in series, composed of a band-pass filter circuit, an absolute value conversion circuit and a comparison and switch circuit. The set level of the voltage comparator can be adjusted through a potentiometer which makes the set level slightly higher than an interference signal, so the interference signal can not be received by the modulator-demodulator before a normal signal arrives.
Description
A kind of transfer of data receiving control device that is used to improve the transfer of data receptivity when carrying out transfer of data, can guarantee to receive the data that pass exactly by the requirement of transmission rate.
Utilize telephone line transmission data at present, particularly the media as transmission data between the microcomputer is widely used.Because telephone line is of low quality and interference occurs, modulator-demodulator sensitivity can not be adjusted in addition, cause the data that receive a lot of mistakes to occur, especially when the both sides' computer that transmits be in together wait state begin to transmit data the time, can't receive accurate data.Be not found to be as yet at present and overcome the above-mentioned inaccurate receiving control device of reception data that causes because of the transmission line quality is bad.
The purpose of this utility model is a kind of transfer of data receiving control device of design, it can make modulator-demodulator sensitivity adjust, transmission line can be detected when occurring disturbing, thereby select to receive the opportunity of data, exist under the condition of interference at general circuit guaranteeing, can carry out transfer of data.
The utility model is to be serially connected on the receiving lines of modulator-demodulator.Be made up of its three partial circuit, band pass filter and other components and parts that first's bandwidth-limited circuit is made up of two operational amplifiers, high pass filter and low pass filter are formed.Second portion absolute value translation circuit is by two operational amplifiers, and components and parts such as switching diode are formed.Third part comparison and switching circuit are made up of components and parts such as voltage comparator, field effect transistor and switching diodes.Device inside is furnished with power supply terminal and the input and output terminal that is complementary with modulator-demodulator.When signal appears in number biography circuit, this signal enters bandwidth-limited circuit through input terminal, this circuit centre frequency in accordance with regulations, its other signals in addition of elimination, and filtered signal one road is delivered to the utmost point of the field effect transistor of comparison and switching circuit, the absolute value translation circuit is delivered on another road simultaneously, becomes DC level after rectification, shaping and absolute value conversion.This DC level enters the voltage comparator of comparison and switching circuit, through comparing with given incoming level, as long as the absolute value of this DC level is greater than given incoming level, then this signal makes the field effect transistor conducting through switching diode, and the signal that transmits on the circuit can enter modulator-demodulator.Otherwise if the DC level that obtains through absolute value transform circuit is less than given incoming level, then field effect transistor can not conducting, and the signal on the circuit just can not enter modulator-demodulator, thus reach can the selective reception data opportunity, the purpose of control data reception.
The transmission rate of modulator-demodulator can determine as requested, when the parameter of electric capacity that changes band pass filter and resistance, can reach the purpose that changes centre frequency.Input signal will some attenuation through high pass and low pass filter, still keeps 1:1 for making signal amplitude, so added two-stage calculation amplifier.
Notebook data transmits receiving control device, can improve the receptivity of transfer of data, can guarantee the requirement by transmission rate, receives the transmission data exactly.
Fig. 1 is the circuit structure diagram of an embodiment of the present utility model.
Details are as follows for its course of work: when signal occurring on the number biography circuit, this signal enters bandwidth-limited circuit through input terminal 1, the successively high pass filter of forming via electric capacity 3,4, resistance 5, operational amplifier 9, low pass filter and the operational amplifier 16 formed by resistance 10,11, electric capacity 12, constitute bandwidth-limited circuit by high pass filter and low pass filter, filter centre frequency interference signal in addition, consequent attenuation can be compensated by two-stage calculation amplifier, makes the signal of circuit output thus and the amplitude ratio maintenance 1:1 of original input signal.Deliver to the field effect transistor 31 of comparison and switching circuit through the signal one tunnel of filter circuit output, the absolute value translation circuit is delivered on another road simultaneously, through operational amplifier 19 and 23 and switching diode 18,20,21,22, carry out becoming DC level after rectification and the absolute value conversion.This DC level enters the voltage comparator 28 of comparison and switching circuit, through comparing with given incoming level, as long as the absolute value of this DC level is greater than given incoming level, then this signal just can make field effect transistor 31 conductings through switching diode 30, and the input signal of delivering to field effect transistor 31 through filter circuit can enter modulator-demodulator.Otherwise field effect transistor can not conducting, and input signal just can not enter modulator-demodulator.Make the requirement of modulator-demodulator by transmission rate opportunity that so just can the selective reception data, receives exactly and can pass data.
In bandwidth-limited circuit, its frequency can be determined according to the transmission rate of modulator-demodulator, when need change centre frequency, can pass through to change electric capacity 3,4, and the parameter of resistance 5,6 and resistance 10,11, electric capacity 12 realizes.Element 17 is to be used to adjust signal gain and conversion waveform in the absolute value translation circuit, and its output signal and waveform input signal are consistent, and amplitude keeps 1:1.That operational amplifier 9,16,19,23 adopts is TL084.Relatively with switching circuit in voltage comparator 28 adopts is LM311, that field effect transistor adopts is 3DJ3.
Preset level is to obtain by the resistance of adjusting potentiometer 27, decides according to the interference signal of telephone line.Make preset level a little more than interference signal (general normal signal more much bigger than interference signal), before normal signal did not arrive, interference signal just can not be as normal signal and modulated demodulator receives.
Claims (1)
- A kind of transfer of data receiving control device that is used to improve the transfer of data receptivity is characterized in that:A, bandwidth-limited circuit, it comprises operational amplifier, the high pass filter of being made up of resistance capacitance reaches the low pass filter of being made up of resistance capacitance;B, absolute value translation circuit, it is made up of operational amplifier, switching diode;C, comparison and switching circuit, it is made up of voltage comparator, field effect transistor, switching diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87202675 CN87202675U (en) | 1987-03-05 | 1987-03-05 | Device controlling to receive data transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87202675 CN87202675U (en) | 1987-03-05 | 1987-03-05 | Device controlling to receive data transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87202675U true CN87202675U (en) | 1988-03-02 |
Family
ID=4818784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87202675 Granted CN87202675U (en) | 1987-03-05 | 1987-03-05 | Device controlling to receive data transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87202675U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434681C (en) * | 2003-08-08 | 2008-11-19 | 本田技研工业株式会社 | Controller |
| CN1649280B (en) * | 2004-01-30 | 2010-05-26 | 瑞昱半导体股份有限公司 | Adjustable echo eliminator for full duplex communication system |
| CN1902839B (en) * | 2003-11-13 | 2010-12-22 | Gs电子有限公司 | Repeater for mobile communications system |
| CN106169906A (en) * | 2016-09-05 | 2016-11-30 | 深圳市奈士迪技术研发有限公司 | A kind of communication apparatus with efficiency power generation ability for network communication engineering |
-
1987
- 1987-03-05 CN CN 87202675 patent/CN87202675U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434681C (en) * | 2003-08-08 | 2008-11-19 | 本田技研工业株式会社 | Controller |
| CN1902839B (en) * | 2003-11-13 | 2010-12-22 | Gs电子有限公司 | Repeater for mobile communications system |
| CN1649280B (en) * | 2004-01-30 | 2010-05-26 | 瑞昱半导体股份有限公司 | Adjustable echo eliminator for full duplex communication system |
| CN106169906A (en) * | 2016-09-05 | 2016-11-30 | 深圳市奈士迪技术研发有限公司 | A kind of communication apparatus with efficiency power generation ability for network communication engineering |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |