CN205750816U - A kind of face identification system signal processing system based on differential amplifier circuit - Google Patents
A kind of face identification system signal processing system based on differential amplifier circuit Download PDFInfo
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- CN205750816U CN205750816U CN201620500964.7U CN201620500964U CN205750816U CN 205750816 U CN205750816 U CN 205750816U CN 201620500964 U CN201620500964 U CN 201620500964U CN 205750816 U CN205750816 U CN 205750816U
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Abstract
The utility model discloses a kind of face identification system signal processing system based on differential amplifier circuit, it is characterized in that, mainly by processing chip U, differential amplifier circuit, N pole is connected with the FREP pin processing chip U, the diode D6 that P pole is connected with the RC pin processing chip U after resistance R16, positive pole is connected with the P pole of diode D6, the polar capacitor C8 that negative pole is connected with differential amplifier circuit, the mixing tuning circuit being connected with process chip U, the signal frequency correcting circuit being connected with the COMP pin processing chip U after inductance L1, and the signal pre-processing circuit composition being connected with signal frequency correcting circuit.This utility model carries out steady flat process to the high-low signal frequency in picture signal, and garbage signal frequency in picture signal is eliminated or decays simultaneously, make the transmission of the picture signal energy held stationary of input, thus this utility model can ensure that the accuracy of identification of face identification system.
Description
Technical field
This utility model relates to electronic applications, specifically, is a kind of face identification system based on differential amplifier circuit
Use signal processing system.
Background technology
Along with high-tech flourish, face identification system is wide by people because of its convenience as human body password
Model uses.In addition intelligent management has come into the social life of people now, and many Intelligent Buildings are rised sheer from level ground, suitable
Answer the epoch needs of information, as noble building and working environment, it is necessary to functionally meet the need of current and future development
Ask, become the base of culture and economic development.So face identification system is applied in the gate identification system of Balkh,
But because the interference signal in picture signal cannot be eliminated by the signal processing system of current face identification system, deposit simultaneously
Picture signal is being processed inaccurate, thus is causing the accuracy of identification of face identification system the highest, making face identification system know
Occur time other refusing to recognize situation, i.e. None-identified goes out client, or system has carried out wrong identification, and the place of causing carrys out personnel and enters into
Indoor, bring potential safety hazard.
Therefore it provides a kind of face identification system signal processing system that can improve capacity of resisting disturbance is when business
Anxious.
Utility model content
The purpose of this utility model is that the signal processing system overcoming face identification system of the prior art is anti-interference
Ability, to receive the inaccurate defect of signal processing, it is provided that a kind of based on differential amplifier circuit face identification system
Use signal processing system.
This utility model is achieved through the following technical solutions: a kind of face identification system based on differential amplifier circuit is used
Signal processing system, mainly by process chip U, N pole with process chip U FREP pin be connected, P pole after resistance R16 and
Process the diode D6 that the RC pin of chip U is connected, the differential amplifier circuit being connected with the OUT pin processing chip U, just
Pole and the polar capacitor C8 that P pole is connected, negative pole is connected with differential amplifier circuit of diode D6, be connected with processing chip U
The mixing tuning circuit connect, the signal frequency correcting circuit being connected with the COMP pin processing chip U after inductance L1, with
And the signal pre-processing circuit composition being connected with signal frequency correcting circuit；Described mixing tuning circuit divides and signal frequency
Correcting circuit is connected with differential amplifier circuit.
Described differential amplifier circuit is by amplifier P2, amplifier P3, amplifier P4, audion VT2, negative pole and polar capacitor
Polar capacitor C9, the P pole that the negative pole of C8 is connected, positive pole is connected with the electrode input end of amplifier P2 is defeated with amplifier P2's
Go out the diode D7 that end is connected, N pole negative input with amplifier P2 after inductance L2 is connected, negative pole and diode D7
Polar capacitor C10, the P pole that N pole is connected, positive pole negative input with amplifier P2 after resistance R17 is connected through electricity
Be connected with the outfan of amplifier P2 after resistance R20, N pole sequentially after resistance R22 and resistance R23 with the outfan of amplifier P4
The diode D8 being connected, positive pole is connected with the P pole of diode D8, negative pole is connected with the electrode input end of amplifier P4
Polar capacitor C12, one end is connected with the electrode input end of amplifier P3, the other end is connected with the negative pole of polar capacitor C10
The resistance R18 of rear ground connection, negative pole is connected with the base stage of audion VT2, positive pole after resistance R19 with the outfan of amplifier P3
The polar capacitor C11 being connected, and negative pole outfan with amplifier P4 after resistance R24 is connected, positive pole is through resistance R21
The polar capacitor C13 composition that negative input with amplifier P4 is connected afterwards；The negative input of described amplifier P3 and place
The OUT pin of reason chip U is connected；The positive pole of the grounded collector of described audion VT2, its emitter stage and polar capacitor C13
It is connected；The outfan of described amplifier P4 is as the outfan of differential amplifier circuit.
Described signal pre-processing circuit is by amplifier P1, and positive pole is connected with the electrode input end of amplifier P1, negative pole is made
Be connected with the outfan of amplifier P1 for polar capacitor C1, the N pole of the input of signal pre-processing circuit, P pole is through resistance R1
The diode D1 that electrode input end with amplifier P1 is connected afterwards, positive pole is connected with the electrode input end of amplifier P1, bears
Polar capacitor C2, the P pole that pole is connected with the N pole of diode D1 after resistance R2 after resistance R5 with the outfan of amplifier P1
Be connected, diode D2 that N pole electrode input end with amplifier P1 after resistance R3 is connected, and negative pole and amplifier P1
The polar capacitor C3 that negative input is connected, positive pole is connected with the P pole of diode D2 after resistance R4 composition；Described put
The negative input ground connection of big device P1, the P pole of its outfan and diode D2 is collectively forming the outfan of signal pre-processing circuit
And be connected with signal frequency correcting circuit.
Described signal frequency correcting circuit is connected with the outfan of amplifier P1 by audion VT1, P pole, N pole is through electricity
After sense L1 with diode D4, the P pole that is connected of COMP pin processing chip U after resistance R7 with the outfan phase of amplifier P1
The diode D3 that connection, N pole are sequentially connected with the N pole of diode D4 after resistance R9 through resistance R8, positive pole is after resistance R6
Be connected with the P pole of diode D4, negative pole be connected with the colelctor electrode of audion VT1 after the polar capacitor C4 of ground connection, positive pole with
The polar capacitor C5 that the N pole of diode D4 is connected, negative pole is connected with the base stage of audion VT1, and one end and diode
The resistance R10 composition that the N pole of D4 is connected, the other end is connected with the emitter stage of audion VT1；Described audion VT1 sends out
Emitter-base bandgap grading is connected with mixing tuning circuit；The positive pole of described polar capacitor C4 is connected with the P pole of diode D2.
Described mixing tuning circuit is connected with the THR pin processing chip U by one end, the other end and process chip U
The resistance R12 that CMIN pin is connected, negative pole with process chip U CMIN pin be connected, positive pole after resistance R11 with three poles
Polar capacitor C6, the P pole that the emitter stage of pipe VT1 is connected emitter stage with audion VT1 after resistance R13 is connected, N pole warp
The diode D5 being connected with the OUT pin processing chip U after adjustable resistance R15, one end and the CMIN pin phase processing chip U
The resistance R14 that connection, the other end are connected with the N pole of diode D5, and positive pole is connected with the REF pin of process chip U,
The polar capacitor C7 composition that negative pole is connected with the N pole of diode D5.
For practical effect of the present utility model, described process chip U preferentially have employed and comes into the integrated chip of LM331
Realize.
This utility model compared with prior art, has the following advantages and beneficial effect:
(1) this utility model has stronger capacity of resisting disturbance, garbage signal frequency in picture signal can be eliminated, make figure
Image signal can accurately transmit, so that it is guaranteed that the accuracy that this utility model is to signal processing.
(2) this utility model can carry out frequency correction to picture signal, makes the transmission speed of each frequency of picture signal
Can keep consistent, thus effectively raise this utility model accuracy to signal processing.
(3) mixing in picture signal can effectively be tuned by this utility model, makes each frequency of picture signal
Held stationary, clear, effectively ensure that signal can accurately be processed by this utility model.
(4) this utility model can export after the picture signal after processing effectively being amplified, and ensures that face
The accuracy of identification of identification system.
(5) this utility model can make the accuracy of identification of face identification system improve more than 70%, can effectively prevent face
Identification system carries out wrong identification, thus effectively raises the practicality of face identification system.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model.
Fig. 2 is the electrical block diagram of differential amplifier circuit of the present utility model.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, this utility model is described in further detail, but reality of the present utility model
The mode of executing is not limited to this.
Embodiment
As it is shown in figure 1, this utility model is mainly by processing chip U, resistance R16, polar capacitor C8, diode D6, difference
Amplifying circuit, is mixed tuning circuit, signal frequency correcting circuit, and signal pre-processing circuit composition.
During enforcement, the N pole of diode D6 with process chip U FREP pin be connected, its P pole after resistance R16 with place
The RC pin of reason chip U is connected.Differential amplifier circuit is connected with the OUT pin processing chip U.The positive pole of polar capacitor C8
Be connected with the P pole of diode D6, negative pole is connected with differential amplifier circuit.Mixing tuning circuit is connected with processing chip U.
Signal frequency correcting circuit is connected with the COMP pin processing chip U after inductance L1.Its signal pre-processing circuit and signal
Deaccentuator is connected.Described signal frequency correcting circuit is connected with mixing tuning circuit.
Wherein, described signal pre-processing circuit by amplifier P1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5,
Polar capacitor C1, polar capacitor C2, polar capacitor C3, diode D1, and diode D2 form.
During connection, the positive pole of polar capacitor C1 is connected with the electrode input end of amplifier P1, its negative pole is pre-as signal
Process the input of circuit.The N pole of diode D1 is connected with the outfan of amplifier P1, its P pole after resistance R1 with amplification
The electrode input end of device P1 is connected.The positive pole of polar capacitor C2 is connected with the electrode input end of amplifier P1, its negative pole warp
After resistance R2, the N pole with diode D1 is connected.
Meanwhile, the P pole of diode D2 outfan with amplifier P1 after resistance R5 is connected, its N pole is after resistance R3
It is connected with the electrode input end of amplifier P1.The negative pole of polar capacitor C3 is connected with the negative input of amplifier P1, it
Positive pole P pole with diode D2 after resistance R4 is connected.The negative input ground connection of described amplifier P1, its outfan and two
The P pole of pole pipe D2 is collectively forming the outfan of signal pre-processing circuit and is connected with signal frequency correcting circuit.
Further, described signal frequency correcting circuit by audion VT1, resistance R6, resistance R7, resistance R8, resistance R9,
Resistance R10, polar capacitor C4, polar capacitor C5, diode D3, and diode D4 form.
During connection, the P pole of diode D4 is connected with the outfan of amplifier P1, its N pole after inductance L1 with process core
The COMP pin of sheet U is connected.The P pole of diode D3 outfan with amplifier P1 after resistance R7 is connected, its N pole sequentially
It is connected through resistance R8 N pole with diode D4 after resistance R9.The positive pole of polar capacitor C4 after resistance R6 with diode D4
P pole be connected, its negative pole be connected with the colelctor electrode of audion VT1 after ground connection.
Wherein, the positive pole of polar capacitor C5 be connected with the N pole of diode D4, the base stage phase of its negative pole and audion VT1
Connect.One end of resistance R10 is connected with the N pole of diode D4, its other end is connected with the emitter stage of audion VT1.Institute
The emitter stage stating audion VT1 is connected with mixing tuning circuit；The P pole phase of the positive pole of described polar capacitor C4 and diode D2
Connect.
Further, described mixing tuning circuit is by resistance R11, resistance R12, resistance R13, resistance R14, adjustable resistance
R15, polar capacitor C6, polar capacitor C7, diode D5, and inductance L1 form.
During connection, one end of resistance R12 is connected with the THR pin processing chip U, its other end with process chip U
CMIN pin is connected.The negative pole of polar capacitor C6 is connected with the CMIN pin processing chip U, its positive pole is after resistance R11
It is connected with the emitter stage of audion VT1.The P pole of diode D5 emitter stage with audion VT1 after resistance R13 is connected,
Its N pole is connected with the OUT pin processing chip U after adjustable resistance R15.One end of resistance R14 and the CMIN processing chip U
Pin is connected, its other end is connected with the N pole of diode D5.The positive pole of polar capacitor C7 and the REF pin processing chip U
Be connected, its negative pole is connected with the N pole of diode D5.
As in figure 2 it is shown, described differential amplifier circuit is by amplifier P2, amplifier P3, amplifier P4, audion VT2, resistance
R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23, resistance R24, polar capacitor C9, polarity
Electric capacity C10, polar capacitor C11, polar capacitor C12, polar capacitor C13, diode D7, diode D8, and inductance L2 form.
During connection, the negative pole of polar capacitor C9 is connected with the negative pole of polar capacitor C8, its positive pole and amplifier P2 just
Pole input is connected.The P pole of diode D7 is connected with the outfan of amplifier P2, its N pole after inductance L2 with amplifier
The negative input of P2 is connected.The negative pole of polar capacitor C10 is connected with the N pole of diode D7, its positive pole is after resistance R17
It is connected with the negative input of amplifier P2.The P pole of diode D8 outfan with amplifier P2 after resistance R20 is connected
Connect, N pole is sequentially connected through resistance R22 outfan with amplifier P4 after resistance R23.
Meanwhile, the positive pole of polar capacitor C12 be connected with the P pole of diode D8, its negative pole defeated with the positive pole of amplifier P4
Enter end to be connected.One end of resistance R18 is connected with the electrode input end of amplifier P3, its other end and polar capacitor C10
Negative pole be connected after ground connection.The negative pole of polar capacitor C11 is connected with the base stage of audion VT2, its positive pole after resistance R19 with
The outfan of amplifier P3 is connected.The negative pole of polar capacitor C13 outfan with amplifier P4 after resistance R24 is connected,
Positive pole negative input with amplifier P4 after resistance R21 is connected.
The negative input of described amplifier P3 is connected with the OUT pin processing chip U；The collection of described audion VT2
Electrode ground connection, its emitter stage is connected with the positive pole of polar capacitor C13；The outfan of described amplifier P4 is as differential amplification electricity
The outfan on road is also connected with the controller of face identification system.
During operation, this utility model carries out steady flat process to the high-low signal frequency in picture signal, and simultaneously by image
In signal, garbage signal frequency eliminates or decays, and makes the transmission of picture signal energy held stationary.This utility model to biography
Signal frequency in defeated is corrected, and makes the transmission speed of each frequency of picture signal can keep consistent, it is ensured that picture signal
Stablizing of transmission.Meanwhile, the mixing in picture signal is effectively tuned by this utility model, makes each frequency of signal protect
Maintain an equal level steady, clear, be tuned after rear signal is analyzed processing by process chip U and obtain image information accurately.This practicality
Novel will process the image information that obtains after chip U processes and be transferred to the controller of face identification system accurately, so that it is guaranteed that
The accuracy of identification of face identification system.
This utility model can make the accuracy of identification of face identification system improve more than 70%, can effectively prevent recognition of face
System carries out wrong identification, thus effectively raises the practicality of face identification system.Actual make in order to of the present utility model
By effect, described process chip U preferentially have employed and realizes for the integrated chip of LM331.
According to above-described embodiment, can well realize this utility model.
Claims (6)
1. a face identification system signal processing system based on differential amplifier circuit, it is characterised in that main by processing
Chip U, N pole is connected with the FREP pin processing chip U, P pole is connected with the RC pin processing chip U after resistance R16
Diode D6, with the differential amplifier circuit that is connected of OUT pin processing chip U, positive pole is extremely connected with the P of diode D6
Connect, polar capacitor C8 that negative pole is connected with differential amplifier circuit, and process the mixing tuning circuit that chip U is connected, through electricity
With the signal frequency correcting circuit that is connected of COMP pin processing chip U after sense L1, and with signal frequency correcting circuit phase
The signal pre-processing circuit composition connected；Described mixing tuning circuit divides and signal frequency correcting circuit and differential amplifier circuit
It is connected.
A kind of face identification system signal processing system based on differential amplifier circuit the most according to claim 1, its
Being characterised by, described differential amplifier circuit is by amplifier P2, amplifier P3, amplifier P4, audion VT2, negative pole and polarity electricity
Hold polar capacitor C9, the P pole that negative pole is connected, positive pole is connected of C8 with the electrode input end of amplifier P2 with amplifier P2's
The diode D7 that outfan is connected, N pole negative input with amplifier P2 after inductance L2 is connected, negative pole and diode
Polar capacitor C10, the P pole warp that the N pole of D7 is connected, positive pole negative input with amplifier P2 after resistance R17 is connected
After resistance R20 the outfan with amplifier P2 be connected, N pole sequentially after resistance R22 and resistance R23 with the output of amplifier P4
The diode D8 that end is connected, positive pole is connected with the P pole of diode D8, negative pole is connected with the electrode input end of amplifier P4
Polar capacitor C12, one end is connected with the electrode input end of amplifier P3, the other end is connected with the negative pole of polar capacitor C10
Meet the resistance R18 of rear ground connection, negative pole is connected with the base stage of audion VT2, positive pole after resistance R19 with the output of amplifier P3
The polar capacitor C11 that is connected of end, and negative pole outfan with amplifier P4 after resistance R24 is connected, positive pole is through resistance
The polar capacitor C13 composition that after R21, negative input with amplifier P4 is connected；The negative input of described amplifier P3 with
The OUT pin processing chip U is connected；The grounded collector of described audion VT2, its emitter stage is with polar capacitor C13 just
Pole is connected；The outfan of described amplifier P4 is as the outfan of differential amplifier circuit.
A kind of face identification system signal processing system based on differential amplifier circuit the most according to claim 2, its
Being characterised by, described signal pre-processing circuit is by amplifier P1, and positive pole is connected with the electrode input end of amplifier P1, negative pole is made
Be connected with the outfan of amplifier P1 for polar capacitor C1, the N pole of the input of signal pre-processing circuit, P pole is through resistance R1
The diode D1 that electrode input end with amplifier P1 is connected afterwards, positive pole is connected with the electrode input end of amplifier P1, bears
Polar capacitor C2, the P pole that pole is connected with the N pole of diode D1 after resistance R2 after resistance R5 with the outfan of amplifier P1
Be connected, diode D2 that N pole electrode input end with amplifier P1 after resistance R3 is connected, and negative pole and amplifier P1
The polar capacitor C3 that negative input is connected, positive pole is connected with the P pole of diode D2 after resistance R4 composition；Described put
The negative input ground connection of big device P1, the P pole of its outfan and diode D2 is collectively forming the outfan of signal pre-processing circuit
And be connected with signal frequency correcting circuit.
A kind of face identification system signal processing system based on differential amplifier circuit the most according to claim 3, its
Being characterised by, described signal frequency correcting circuit is connected with the outfan of amplifier P1 by audion VT1, P pole, N pole is through electricity
After sense L1 with diode D4, the P pole that is connected of COMP pin processing chip U after resistance R7 with the outfan phase of amplifier P1
The diode D3 that connection, N pole are sequentially connected with the N pole of diode D4 after resistance R9 through resistance R8, positive pole is after resistance R6
Be connected with the P pole of diode D4, negative pole be connected with the colelctor electrode of audion VT1 after the polar capacitor C4 of ground connection, positive pole with
The polar capacitor C5 that the N pole of diode D4 is connected, negative pole is connected with the base stage of audion VT1, and one end and diode
The resistance R10 composition that the N pole of D4 is connected, the other end is connected with the emitter stage of audion VT1；Described audion VT1 sends out
Emitter-base bandgap grading is connected with mixing tuning circuit；The positive pole of described polar capacitor C4 is connected with the P pole of diode D2.
A kind of face identification system signal processing system based on differential amplifier circuit the most according to claim 4, its
Being characterised by, described mixing tuning circuit is connected with the THR pin processing chip U by one end, the other end and process chip U
The resistance R12 that CMIN pin is connected, negative pole with process chip U CMIN pin be connected, positive pole after resistance R11 with three poles
Polar capacitor C6, the P pole that the emitter stage of pipe VT1 is connected emitter stage with audion VT1 after resistance R13 is connected, N pole warp
The diode D5 being connected with the OUT pin processing chip U after adjustable resistance R15, one end and the CMIN pin phase processing chip U
The resistance R14 that connection, the other end are connected with the N pole of diode D5, and positive pole is connected with the REF pin of process chip U,
The polar capacitor C7 composition that negative pole is connected with the N pole of diode D5.
A kind of face identification system signal processing system based on differential amplifier circuit the most according to claim 5, its
Being characterised by, described process chip U is the integrated chip of LM331.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620500964.7U CN205750816U (en) | 2016-05-26 | 2016-05-26 | A kind of face identification system signal processing system based on differential amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620500964.7U CN205750816U (en) | 2016-05-26 | 2016-05-26 | A kind of face identification system signal processing system based on differential amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205750816U true CN205750816U (en) | 2016-11-30 |
Family
ID=57362188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620500964.7U Expired - Fee Related CN205750816U (en) | 2016-05-26 | 2016-05-26 | A kind of face identification system signal processing system based on differential amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205750816U (en) |
-
2016
- 2016-05-26 CN CN201620500964.7U patent/CN205750816U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20170526 |
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| CF01 | Termination of patent right due to non-payment of annual fee |