CN207304502U - A kind of silent face living body detection device using face complexion reflectivity - Google Patents

Abstract

A kind of silent face living body detection device using face complexion reflectivity of the utility model, received including signal and adjust circuit, compare amplifying circuit, filter circuit, the signal receives the reception of adjusting circuit and uses the signal in signal transmission passage in the silent face living body detection device of face complexion reflectivity, transport and placing device AR2 is used through comparing amplifying circuit, AR3 compares after amplification in input filter circuit, filter circuit uses inductance L1, L2 and polar capacitor C3, C4 is filtered, and exported after the RC circuit connected in series filtering composed in parallel with resistance R5 and capacitance C4, it that is to say and flow into the silent face living body detection device using face complexion reflectivity in signal transmission passage, have great practical value and Development volue.

Description

A kind of silent face living body detection device using face complexion reflectivity

Technical field

Detection technique field is the utility model is related to, more particularly to a kind of silent face using face complexion reflectivity Living body detection device.

Background technology

At present, using the signal in signal transmission passage in the silent face living body detection device of face complexion reflectivity The quality of signal processing will directly affect signal transmission in the silent face living body detection device using face complexion reflectivity and lead to Using effect in road, at present the problem of be signal fade resistance it is weak, since current electromagnetic interference is more, the stabilization of signal Property is also required to improve.

So the utility model provides a kind of new scheme to solve the problems, such as this.

Utility model content

For the above situation, to overcome the defect of the prior art, the purpose of the utility model is to provide a kind of user The silent face living body detection device of face colour of skin reflectivity, have be skillfully constructed, characteristic simple in structure, efficiently solve letter Number fade resistance it is weak, since current electromagnetic interference is more, the problem of stability of signal is also required to improve.

Its technical solution solved is a kind of silent face living body detection device using face complexion reflectivity, including Signal receives and adjusts circuit, compares amplifying circuit, filter circuit, and it is anti-using face complexion that the signal receives adjusting circuit reception Penetrate the signal in signal transmission passage in the silent face living body detection device of rate, through compare amplifying circuit with transport and placing device AR2, AR3 compares after amplification in input filter circuit, and filter circuit is filtered with inductance L1, L2 and polar capacitor C3, C4, and and resistance Exported after the RC circuit connected in series filtering that R5 and capacitance C4 are composed in parallel；

The relatively amplifying circuit includes transport and placing device AR2, the transmitting of the homophase input termination triode Q4 of transport and placing device AR2 Pole, one end of the anti-phase input termination capacitance C6 of transport and placing device AR2, the inverting input of another termination transport and placing device AR3 of capacitance C6, The emitter of the homophase input termination triode Q1 of transport and placing device AR3, one end of the output terminating resistor R5 of transport and placing device AR2, AR3.

Due to the use of above technical scheme, the utility model has the following advantages that compared with prior art；

1, select resistance R5 to receive the signal for comparing amplifying circuit input, for stabilization signal, with inductance L1, L2 and pole Property capacitance C3, C4 constitute the filtering of π types filter circuit, while the RC circuit connected in series composed in parallel with resistance R5 and capacitance C4 filters After export, stabilize signal, have great practical value and Development volue.

2, the electric potential signal at signal reception adjusting circuit difference is received with transport and placing device AR2 and transport and placing device AR3, is compared Example enhanced processing, improves the fade resistance of signal, and stabilizes signal, can effectively prevent other equipment interference.

Brief description of the drawings

Fig. 1 is a kind of circuit diagram of silent face living body detection device using face complexion reflectivity of the utility model.

Fig. 2 is a kind of circuit theory of silent face living body detection device using face complexion reflectivity of the utility model Figure.

Embodiment

Foregoing and other technology contents, feature and effect in relation to the utility model, in following cooperation with reference to figures 1 through attached Fig. 2 is in the detailed description of embodiment, can clearly present.The structure content being previously mentioned in following embodiments, is to say Bright book attached drawing is reference.

Each exemplary embodiment of the utility model is described below with reference to accompanying drawings.

Embodiment one, a kind of silent face living body detection device using face complexion reflectivity, including signal, which receive, to be adjusted Economize on electricity road, compare amplifying circuit, filter circuit, and the signal, which receives, adjusts silence of the circuit reception using face complexion reflectivity Signal in face living body detection device in signal transmission passage, relatively puts through comparing amplifying circuit with transport and placing device AR2, AR3 After big in input filter circuit, filter circuit is filtered with inductance L1, L2 and polar capacitor C3, C4, and with resistance R5 and capacitance Exported after the RC circuit connected in series filtering that C4 is composed in parallel, that is to say to flow into and examined using the silent face live body of face complexion reflectivity Survey in device in signal transmission passage；

The relatively amplifying circuit receives signal with transport and placing device AR2 and transport and placing device AR3 and receives at adjusting circuit difference Electric potential signal, carry out ratio enlargement processing, improve the fade resistance of signal, and stabilize signal, transport and placing device AR2's is same mutually defeated Enter to terminate the emitter of triode Q4, one end of the anti-phase input termination capacitance C6 of transport and placing device AR2, another termination fortune of capacitance C6 The inverting input of device AR3 is put, the emitter of the homophase input termination triode Q1 of transport and placing device AR3, transport and placing device AR2, AR3's is defeated Go out one end of terminating resistor R5.

Embodiment two, on the basis of embodiment one, the signal receives adjusting circuit and uses resistance R1 and capacitance C1 simultaneously Join the RC circuit filterings of composition, capacitance C2 is filter capacitor, is filled when using the silent face In vivo detection of face complexion reflectivity When putting the abnormal signal in signal transmission passage, triode Q1 is not turned on, therefore triode Q2, Q4 are not turned on, and are reached and are filtered out The effect of abnormal signal, when the letter in the silent face living body detection device using face complexion reflectivity in signal transmission passage When number normal, triode Q1 conductings, while triode Q2, Q4 are turned on, input is compared in amplifying circuit, and wherein triode Q2 is played The effect of circuit, triode Q2 and triode Q1 composition compound circuits are protected, avoids the silent people using face complexion reflectivity When abnormal signal current potential in face living body detection device in signal transmission passage is excessive, puncture triode Q1, triode Q2 can Play the role of partial pressure, reach the effect of protection circuit, while improve the reliability of circuit, the termination signal input of resistance R1 Port, one end of another terminating resistor R3, R2, R6 of resistance R1 and the base stage of one end of capacitance C1, C2 and triode Q1, electricity Hold the other end ground connection of C1, the collector of another termination triode Q1 of resistance R3, the emitter of triode Q1 meets triode Q2 Base stage, the collector of another termination triode Q2 of resistance R6, the collector of another termination triode Q4 of resistance R2, three poles The emitter of pipe Q2 connects the base stage of triode Q4.

Embodiment three, on the basis of embodiment two, it is defeated that the filter circuit selects resistance R5 receptions to compare amplifying circuit The signal entered, for stabilization signal, constitutes the filtering of π types filter circuit, at the same time with inductance L1, L2 and polar capacitor C3, C4 Exported after the RC circuit connected in series filtering composed in parallel with resistance R5 and capacitance C4, that is to say that input is received with signal and adjust circuit company In the signal transmission passage connect, one end of termination inductance L1, a L2 of resistance R5 and the cathode of polar capacitor C3, polar capacitor C3 Anode ground connection, one end of another terminating resistor R7 of inductance L1, L2 and the cathode of polar capacitor C4, the anode of polar capacitor C4 Ground connection, one end of another termination capacitor C5 of resistance R7 and signal output port, the other end ground connection of capacitance C5.

When the present invention is specifically used, a kind of silent face living body detection device using face complexion reflectivity, including letter Number receive and to adjust circuit, compare amplifying circuit, filter circuit, the signal receives to adjust circuit and receive to be reflected using face complexion Signal in the silent face living body detection device of rate in signal transmission passage, through compare amplifying circuit with transport and placing device AR2, AR3 compares after amplification in input filter circuit, and filter circuit is filtered with inductance L1, L2 and polar capacitor C3, C4, and and resistance Exported after the RC circuit connected in series filtering that R5 and capacitance C4 are composed in parallel, that is to say the silent people flowed into using face complexion reflectivity In face living body detection device in signal transmission passage, the relatively amplifying circuit receives letter with transport and placing device AR2 and transport and placing device AR3 Number the electric potential signal adjusted at circuit difference is received, carry out ratio enlargement processing, improve the fade resistance of signal, and stabilize Signal, the signal, which receives, adjusts the RC circuit filterings that circuit is composed in parallel with resistance R1 and capacitance C1, and capacitance C2 is filtering Capacitance, when abnormal signal in signal transmission passage in the silent face living body detection device using face complexion reflectivity, Triode Q1 is not turned on, therefore triode Q2, Q4 are not turned on, and reaches the effect for filtering out abnormal signal, when anti-using face complexion Penetrate signal in the silent face living body detection device of rate in signal transmission passage it is normal when, triode Q1 conductings, while three poles Pipe Q2, Q4 are turned on, and input is compared in amplifying circuit, and wherein triode Q2 plays the role of protecting circuit, triode Q2 and three poles Pipe Q1 forms compound circuit, avoids in the silent face living body detection device using face complexion reflectivity in signal transmission passage Abnormal signal current potential it is excessive when, puncture triode Q1, triode Q2 can play the role of partial pressure, reach the effect of protection circuit Fruit, while the reliability of circuit is improved, the filter circuit selects resistance R5 to receive the signal for comparing amplifying circuit input, in order to Stabilization signal, with inductance L1, L2 and polar capacitor C3, C4 constitute π types filter circuit filtering, while with resistance R5 and capacitance Exported after the RC circuit connected in series filtering that C4 is composed in parallel, that is to say that input is led to the signal transmission that signal reception adjusting circuit is connected In road.

The above is to combine embodiment further detailed description of the utility model, it is impossible to assert this Utility model specific implementation is limited only to this；For belonging to the utility model and for those skilled in the technology concerned, The expansion made under the premise of technical solutions of the utility model thinking and operating method, the replacement of data, should all fall Within scope of protection of the utility model.

Claims (3)

1. a kind of silent face living body detection device using face complexion reflectivity, including signal receive and adjust circuit, compare Amplifying circuit, filter circuit, it is characterised in that the signal, which receives, adjusts silence of the circuit reception using face complexion reflectivity Signal in face living body detection device in signal transmission passage, relatively puts through comparing amplifying circuit with transport and placing device AR2, AR3 After big in input filter circuit, filter circuit is filtered with inductance L1, L2 and polar capacitor C3, C4, and with resistance R5 and capacitance Exported after the RC circuit connected in series filtering that C4 is composed in parallel；

The relatively amplifying circuit includes transport and placing device AR2, the emitter of the homophase input termination triode Q4 of transport and placing device AR2, fortune Put one end of the anti-phase input termination capacitance C6 of device AR2, the inverting input of another termination transport and placing device AR3 of capacitance C6, amplifier The emitter of the homophase input termination triode Q1 of device AR3, one end of the output terminating resistor R5 of transport and placing device AR2, AR3.

A kind of 2. silent face living body detection device using face complexion reflectivity as claimed in claim 1, it is characterised in that The signal, which receives adjusting circuit, includes resistance R1, a termination signal input port of resistance R1, another termination electricity of resistance R1 Hinder one end and one end of capacitance C1, C2 and the base stage of triode Q1 of R3, R2, R6, the other end ground connection of capacitance C1, resistance R3 Another termination triode Q1 collector, the emitter of triode Q1 connects the base stage of triode Q2, another termination of resistance R6 The collector of triode Q2, the collector of another termination triode Q4 of resistance R2, the emitter of triode Q2 meet triode Q4 Base stage.

A kind of 3. silent face living body detection device using face complexion reflectivity as claimed in claim 2, it is characterised in that The filter circuit includes resistance R5, one end of another termination inductance L1, L2 of resistance R5 and the cathode of polar capacitor C3, polarity The anode ground connection of capacitance C3, one end of another terminating resistor R7 of inductance L1, L2 and the cathode of polar capacitor C4, polar capacitor C4 Anode ground connection, one end of another termination capacitor C5 of resistance R7 and signal output port, the other end ground connection of capacitance C5.