CN102355228B - Multi-channel lowpass filter - Google Patents
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- CN102355228B CN102355228B CN201110257960.2A CN201110257960A CN102355228B CN 102355228 B CN102355228 B CN 102355228B CN 201110257960 A CN201110257960 A CN 201110257960A CN 102355228 B CN102355228 B CN 102355228B
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- 238000002955 isolation Methods 0.000 claims description 14
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Abstract
The invention discloses a multi-channel lowpass filter, which comprises a power supply module, a lowpass filtering control module and at least one path of filtering module, wherein the filtering module comprises a filtering input channel module, an active lowpass filtering module, a signal amplification module, a switch capacitor filtering module and a filtering output channel module; the power supply module is respectively connected with the lowpass filtering control module, the active lowpass filtering module, a signal amplification module and a switch capacitor filtering module; the filtering input channel module is connected with the active lowpass filtering module; the active lowpass filtering module is connected with the signal amplification module; the signal amplification module is connected with the switch capacitor filtering module; the lowpass filtering control module is connected with the switch capacitor filtering module; and the switch capacitor filtering module is connected with the lowpass output channel module. The multi-channel lowpass filter has the advantages of large noise margin, strong anti-jamming capability, high precision, low cutoff frequency, small amplitude fluctuation during frequency response and high stability.
Description
Technical field
The present invention relates to a kind of low pass filter, especially relate to a kind of Multi-channel low pass filter.
Background technology
Multi-channel low pass filter can transmit the useful frequency content in input signal, decays or suppresses useless frequency content; Traditional Multi-channel low pass filter mainly contains Butterworth filter, Chebyshev filter and elliptic filter, and three has different passbands and transition band characteristic; Elliptic filter is with respect to Butterworth filter, and its transition band is more precipitous, and phase-frequency characteristic is poor; Chebyshev filter is with respect to Butterworth filter, and its transition band is narrower, and phase-frequency characteristic is also poor; Along with the raising that in safety in production field and monitoring detection field, signal filtering requires, the cut-off frequency of traditional Multi-channel low pass filter is relatively high, and its filtering accuracy and stability more and more can not meet the demands; And Butterworth LPF has good Frequency Response in passband, in the safety in production fields such as bridge, dam, skyscraper, tunnel, highway, electric power, petrochemical industry, fire-fighting and HVAC and monitoring detection field, development fast and application have widely been obtained.
Summary of the invention
Technical problem to be solved by this invention is to provide that a kind of cut-off frequency is low, precision is high, amplitude fluctuation is little during frequency response, stability is high, is applicable to the Multi-channel low pass filter of safety in production field and monitoring detection field.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of Multi-channel low pass filter, comprise power module, also comprise low-pass filtering control module and at least one road filtration module, described filtration module comprises filtering input channel module, active low-pass filter module, signal amplification module, switch-capacitor filtering module and filtering output channel module, described power module respectively with described low-pass filtering control module, described active low-pass filter module, described signal amplification module is connected with described switch-capacitor filtering module, the signal output part of described filtering input channel module is connected with the signal input part of described active low-pass filter module, the signal output part of described active low-pass filter module is connected with the signal input part of described signal amplification module, the signal output part of described signal amplification module is connected with the signal input part of described switch-capacitor filtering module, the signal output part of described low-pass filtering control module is connected with the control end of described switch-capacitor filtering module, the signal output part of described switch-capacitor filtering module is connected with described filtering output channel module.
Described active low-pass filter module is by the first amplifier chip, the second amplifier chip, the first resistance, the second resistance, the first electric capacity, the second electric capacity and the first variable capacitance diode form, the in-phase signal input of the first described amplifier chip is connected with one end of the first described resistance, the anodic bonding of the other end of the first described resistance and the first described variable capacitance diode, the minus earth of the first described variable capacitance diode, the inversion signal input of the first described amplifier chip is connected with the signal output part of the first described amplifier chip, the signal output part of the first described amplifier chip is connected with the in-phase signal input of described the second amplifier chip by the second described resistance, the in-phase signal input of the second described amplifier chip is by the first capacity earth, the inversion signal input of the second described amplifier chip is connected with the signal output part of the second described amplifier chip, the inversion signal input of the first described amplifier chip is connected with the signal output part of described the second amplifier chip by the second described electric capacity, access respectively-12V of the negative voltage input voltage of the negative voltage input of the first described amplifier chip and the second described amplifier chip, access respectively+12V of the positive voltage input voltage of the positive voltage input of the first described amplifier chip and the second described amplifier chip.
Described signal amplification module is by the 3rd amplifier chip, the 3rd resistance, the 4th resistance, the first rheostat and the 3rd electric capacity form, the in-phase signal input of the 3rd described amplifier chip is connected with the 3rd described resistance, the in-phase signal input of the 3rd described amplifier chip is by the 3rd described capacity earth, the inversion signal input of the 3rd described amplifier chip is by the 4th described grounding through resistance, the inversion signal input of the 3rd described amplifier chip is connected with the signal output part of described the 3rd amplifier chip by the first described rheostat, the positive voltage input access+12V voltage of the 3rd described amplifier chip, the negative voltage input access-12V voltage of the 3rd described amplifier chip.
Described low-pass filtering control module is by the first single row pin terminal, the second single row pin terminal, the 3rd single row pin terminal, the 4th single row pin terminal, pin connector, microprocessor chip and peripheral circuit form, the first described single row pin terminal is connected with described microprocessor chip, the second described single row pin terminal is connected with described microprocessor chip, the 3rd described single row pin terminal is connected with described microprocessor chip, the 4th described single row pin terminal is connected with described microprocessor chip, described microprocessor chip is connected with described pin connector.
Described switch-capacitor filtering module is comprised of switch-capacitor filtering chip and peripheral circuit.
Described power module is comprised of voltage stabilizing circuit, the first inductance isolation and capacitor filter, the second inductance isolation and capacitor filter, the 3rd inductance isolation and capacitor filter, the 4th inductance isolation and capacitor filter, voltage conversion circuit and binding post, and voltage stabilizing chip and peripheral circuit that described voltage stabilizing circuit is L7805 by model form.
Between described signal amplification module and described switch-capacitor filtering module, be provided with voltage follow module, the signal input part of described voltage follow module is connected with the signal output part of described signal amplification module, the signal output part of described voltage follow module is connected with the signal input part of described switch-capacitor filtering module, and the power input of described voltage follow module is connected with described power module.
Described voltage follow module is by four high guaily unit chip, the 6th resistance, the 7th resistance, the 8th resistance, the 4th electric capacity and the second variable capacitance diode form, the in-phase signal input of described four high guaily unit chip is by the 8th described grounding through resistance, the inversion signal input of described four high guaily unit chip is connected with one end of the 7th described resistance, the other end of the 7th described resistance is by the 4th described capacity earth, the inversion signal input of described four high guaily unit chip is connected with the signal output part of described four high guaily unit chip by the 6th described resistance, the anodic bonding of the signal output part of described four high guaily unit chip and the second described variable capacitance diode, the minus earth of the second described variable capacitance diode.
Compared with prior art, the invention has the advantages that: input signal after filtering input channel module is transferred to active low-pass filter module, active low-pass filter module is transferred to signal amplification module by the voltage signal receiving, after amplifying, signal amplification module is transferred to switch-capacitor filtering module, low-pass filtering control module output PWM wave control signal is in switch-capacitor filtering module, switch-capacitor filtering module compares the signal transmission of the signal amplification module receiving and PWM wave control signal after coupling, suppress or the useless frequency content that decays, export useful frequency content to filtering output channel module, realize low-pass filtering, wherein active low-pass filter module adopts Bath water low-pass filter circuit to extract useful signal, suppress the noise jamming in input signal, signal amplification module can amplify low frequency small-signal waveform, in switch-capacitor filtering module, adopt LTC-11645CSW chip, there is higher angular frequency precision and lower temperature and float coefficient, amplitude fluctuation while overcoming frequency response, has higher stability, meets the demand of safety in production field and monitoring detection field, if voltage follow module is set between signal amplification module and switch-capacitor filtering module in addition, can play isolation buffer effect, eliminate the impact of load variations on output signal, further strengthen stability.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the circuit theory diagrams of power module of the present invention;
Fig. 3 is the circuit theory diagrams of filtering input channel module of the present invention;
Fig. 4 is the circuit theory diagrams of active low-pass filter module of the present invention;
Fig. 5 is the circuit theory diagrams of signal amplification module of the present invention;
Fig. 6 is the circuit theory diagrams of low-pass filtering control module of the present invention;
Fig. 7 is the circuit theory diagrams of switch-capacitor filtering module of the present invention;
Fig. 8 is the circuit theory diagrams of filtering output channel module of the present invention;
Fig. 9 is the circuit theory diagrams of voltage follow module of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
As shown in Figure 1, a kind of Multi-channel low pass filter, comprise power module 1, low-pass filtering control module 6 and at least one road filtration module, filtration module comprises filtering input channel module 2, active low-pass filter module 3, signal amplification module 4, switch-capacitor filtering module 7 and filtering output channel module 8, power module 1 respectively with low-pass filtering control module 6, active low-pass filter module 3, signal amplification module 4 is connected with switch-capacitor filtering module 7, the signal output part of filtering input channel module 2 is connected with the signal input part of active low-pass filter module 3, the signal output part of active low-pass filter module 3 is connected with the signal input part of signal amplification module 4, the signal output part of signal amplification module 4 is connected with the signal input part of switch-capacitor filtering module 7, the signal output part of low-pass filtering control module 6 is connected with the control end of switch-capacitor filtering module 7, the signal output part of switch-capacitor filtering module 7 is connected with filtering output channel module 8.
In above-mentioned specific embodiment, as shown in Figure 2, power module 1 is comprised of the binding post J1 of voltage stabilizing circuit 13, the first inductance isolation and capacitor filter 9, the second inductance isolation and capacitor filter 10, the 3rd inductance isolation and capacitor filter 11, the 4th inductance isolation and capacitor filter 12, voltage conversion circuit 14 and 6Pin, voltage stabilizing circuit 13 is comprised of voltage stabilizing chip U3 and peripheral circuit, and wherein voltage stabilizing chip U3 is that model is the integrated chip of L7805; The voltage output end of voltage stabilizing chip U3 is connected with low-pass filtering control module 6, voltage conversion circuit 14 comprises that eight respectively by a resistance and an electronic circuit that electric capacity is formed by connecting, each electronic circuit is converted to voltage signal+12Vna by the current signal receiving, + 12Vnb, + 12Vnc, + 12Vnd,-12Vna,-12Vnb,-12Vnc,-12Vnd(is n >=1 wherein) output respectively, power module 1 provides respectively that active low-pass filtering module 3, signal amplification module 4, low-pass filtering control module 6 and switch-capacitor filtering module 7 need ± 12V voltage and ± 5V voltage.
In above-mentioned specific embodiment, as shown in Figure 3, filtering input channel module 2 is comprised of the binding post J2 of 2pin, and binding post J2 access input signal Si nglen(is n >=1 wherein).
In above-mentioned specific embodiment, as shown in Figure 4, active low-pass filter module 3 adopts second order Butterworth filter circuit, by the first amplifier chip A1, the second amplifier chip A2, the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2 and the first variable capacitance diode D1 form, wherein the first amplifier chip A1 and the second amplifier chip A2 are respectively the integrated chip that model is OP177, in-phase signal input+IN of the first amplifier chip A1 is connected with one end of the first resistance R 1, the other end access input signal Si nglen(of the first resistance R 1 is n >=1 wherein) and and the anodic bonding of the first variable capacitance diode D1, the minus earth of the first variable capacitance diode D1, inversion signal input-IN of the first amplifier chip A1 is connected with the signal output part OUT of the first amplifier chip A1, the signal output part OUT of the first amplifier chip A1 is connected with in-phase signal input+IN of the second amplifier chip A2 by the second resistance R 2, in-phase signal input+IN of the second amplifier chip A2 is by the first capacitor C 1 ground connection, inversion signal input-IN of the second amplifier chip A2 is connected with the signal output part OUT of the second amplifier chip A2, inversion signal input-IN of the first amplifier chip A1 is connected with the signal output part OUT of the second amplifier chip A2 by the second capacitor C 2, the signal output part OUT output signal FIRVinn(of the second amplifier chip A2 is n >=1 wherein), access respectively-12V of the negative voltage input V-voltage of the negative voltage input V-of the first amplifier chip A1 and the second amplifier chip A2, access respectively+12V of the positive voltage input V+ voltage of the positive voltage input V+ of the first amplifier chip A1 and the second amplifier chip A2.
In above-mentioned specific embodiment, as shown in Figure 5, signal amplification module 4 is by the 3rd amplifier chip A3, the 3rd resistance R 3, the 4th resistance R 4, the first rheostat B1 and the 3rd capacitor C 3 form, wherein the 3rd amplifier chip A3 is that model is the integrated chip of OP177, in-phase signal input+IN of the 3rd amplifier chip A3 is connected with one end of the 3rd resistance R 3, the output signal FIRVinn(that the other end of the 3rd resistance R 3 accesses active low-pass filtering module 3 is n >=1 wherein), in-phase signal input+IN of the 3rd amplifier chip A3 is by the 3rd capacitor C 3 ground connection, inversion signal input-IN of the 3rd amplifier chip A3 is by the 4th resistance R 4 ground connection, inversion signal input-IN of the 3rd amplifier chip A3 is connected with the signal output part OUT of the 3rd amplifier chip A3 by the first rheostat B1, the signal output part OUT output signal FIRVoutn(of the 3rd amplifier chip A3 is n >=1 wherein), the positive voltage input V+ access+12V voltage of the 3rd amplifier chip A3, the negative voltage input V-access-12V voltage of the 3rd amplifier chip.
In above-mentioned specific embodiment, as shown in Figure 6, low-pass filtering control module 6 is by the first single row pin terminals P 1, the second single row pin terminals P 2, the 3rd single row pin terminals P 3, the 4th single row pin terminals P 4, pin connector P5, microprocessor chip U1 and peripheral circuit form, the first single row pin terminals P 1 wherein, the second single row pin terminals P 2, the 3rd single row pin terminals P 3 and the 4th single row pin terminals P 4 are respectively the terminal that model is Header8H, pin connector P5 is that model is the pin connector of AVRISP10, microprocessor chip U1 is that model is the integrated chip of Atmega128, the pin8 of the first single row pin terminals P 1～pin1 end is held corresponding connection with PB0～PB7 of Atmega128 chip U1, the pin8 of the second single row pin terminals P 2～pin1 end is connected with PC0～PC7 end of Atmega128 chip U1, the pin8 of the 3rd single row pin terminals P 3～pin1 end is connected with PD0～PD7 end of Atmega128 chip U1, the pin8 of the 4th single row pin terminals P 4～pin1 end is connected with PE0～PE7 end of Atmega128 chip U1, the PB1 of Atmega128 chip U1, PE0, PE1 and VCC end are connected with the respective end of AVRISP10 pin connector P5 respectively, wherein peripheral circuit is mainly by the crystal oscillator Z1 of 4mHz, the 9th resistance R 9 and the 5th capacitor C 5 form, the power end VCC of crystal oscillator Z1 connects the voltage output end of the voltage stabilizing chip U3 in voltage stabilizing circuit 13, the output OUT of crystal oscillator Z1 connects the XTAL1 end of the chip U1 of Atmega128, one end of the 9th resistance R 9 is connected with one end of the 5th capacitor C 5, the RESET end of its public connecting end access Atmega128 chip U1, the 9th resistance R 9 another termination VCC, the other end ground connection of the 5th capacitor C 5, Atmega128 chip U1 output PWM wave control signal control switch capacitor filtering module 7 is carried out filtering.
In above-mentioned specific embodiment, as shown in Figure 7 and Figure 8, switch-capacitor filtering module 7 is comprised of switch-capacitor filtering chip U2 and peripheral circuit, wherein switch-capacitor filtering chip U2 is that model is the integrated chip of LTC-11645CSW, filtering output channel module 8 is comprised of the binding post J3 of 2pin, switch-capacitor filtering module 7 receives after the low-pass filtering control module 6 PWM wave control signals of transmission and the output signal of signal amplification module 4, LTC-11645CSW chip U2 mates the output signal of the signal amplification module 4 receiving with PWM wave control signal after, export useful frequency content to binding post J3, realize low-pass filtering, wherein the angular frequency precision of LTC-11645CSW chip U2 can reach 0.03%, temperature is floated coefficient can reach 0.0002DB/ ℃.
In above-mentioned specific embodiment, between signal amplification module 4 and switch-capacitor filtering module 7, can also be provided with voltage follow module 5, the power input of voltage follow module 5 is connected with power module 1, the signal input part of voltage follow module 5 is connected with the signal output part of signal amplification module 4, the signal output part of voltage follow module 5 is connected with the signal input part of switch-capacitor filtering module 7, voltage follow module 5 receives the signal of signal amplification module 4 transmission, this signal is carried out to isolation buffer, eliminate to be transferred to after the impact of load variations and in switch-capacitor filtering module 7, carry out filtering processing, further strengthened the precision and stability of filtering signal, voltage follow module 5 is by four high guaily unit chip A4, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 4th capacitor C 4 and the second variable capacitance diode D2 form, wherein four high guaily unit chip A4 is that model is the integrated chip of OP177, in-phase signal input+IN of four high guaily unit chip A4 is by the 8th resistance R 8 ground connection, inversion signal input-IN of four high guaily unit chip A4 is connected with one end of the 7th resistance R 7, the other end of the 7th resistance R 7 is by the 4th capacitor C 4 ground connection, inversion signal input-IN of four high guaily unit chip A4 is connected with the signal output part OUT of four high guaily unit chip A4 by the 6th resistance R 6, the signal output part OUT of four high guaily unit chip A4 and the anodic bonding of the second variable capacitance diode D2, the minus earth of the second variable capacitance diode D2.
Claims (7)
1. a Multi-channel low pass filter, comprise power module, characterized by further comprising low-pass filtering control module and at least one road filtration module, described filtration module comprises filtering input channel module, active low-pass filter module, signal amplification module, switch-capacitor filtering module and filtering output channel module, described power module respectively with described low-pass filtering control module, described active low-pass filter module, described signal amplification module is connected with described switch-capacitor filtering module, the signal output part of described filtering input channel module is connected with the signal input part of described active low-pass filter module, the signal output part of described active low-pass filter module is connected with the signal input part of described signal amplification module, the signal output part of described signal amplification module is connected with the signal input part of described switch-capacitor filtering module, the signal output part of described low-pass filtering control module is connected with the control end of described switch-capacitor filtering module, the signal output part of described switch-capacitor filtering module is connected with described filtering output channel module, described active low-pass filter module is by the first amplifier chip, the second amplifier chip, the first resistance, the second resistance, the first electric capacity, the second electric capacity and the first variable capacitance diode form, the in-phase signal input of the first described amplifier chip is connected with one end of the first described resistance, the anodic bonding of the other end of the first described resistance and the first described variable capacitance diode, the minus earth of the first described variable capacitance diode, the inversion signal input of the first described amplifier chip is connected with the signal output part of the first described amplifier chip, the signal output part of the first described amplifier chip is connected with the in-phase signal input of described the second amplifier chip by the second described resistance, the in-phase signal input of the second described amplifier chip is by the first capacity earth, the inversion signal input of the second described amplifier chip is connected with the signal output part of the second described amplifier chip, the inversion signal input of the first described amplifier chip is connected with the signal output part of described the second amplifier chip by the second described electric capacity, access respectively-12V of the negative voltage input voltage of the negative voltage input of the first described amplifier chip and the second described amplifier chip, access respectively+12V of the positive voltage input voltage of the positive voltage input of the first described amplifier chip and the second described amplifier chip.
2. a kind of Multi-channel low pass filter according to claim 1, it is characterized in that described signal amplification module is by the 3rd amplifier chip, the 3rd resistance, the 4th resistance, the first rheostat and the 3rd electric capacity form, the in-phase signal input of the 3rd described amplifier chip is connected with the 3rd described resistance, the in-phase signal input of the 3rd described amplifier chip is by the 3rd described capacity earth, the inversion signal input of the 3rd described amplifier chip is by the 4th described grounding through resistance, the inversion signal input of the 3rd described amplifier chip is connected with the signal output part of described the 3rd amplifier chip by the first described rheostat, the positive voltage input access+12V voltage of the 3rd described amplifier chip, the negative voltage input access-12V voltage of the 3rd described amplifier chip.
3. a kind of Multi-channel low pass filter according to claim 1, it is characterized in that described low-pass filtering control module is by the first single row pin terminal, the second single row pin terminal, the 3rd single row pin terminal, the 4th single row pin terminal, pin connector, microprocessor chip and peripheral circuit form, the first described single row pin terminal is connected with described microprocessor chip, the second described single row pin terminal is connected with described microprocessor chip, the 3rd described single row pin terminal is connected with described microprocessor chip, the 4th described single row pin terminal is connected with described microprocessor chip, described microprocessor chip is connected with described pin connector.
4. a kind of Multi-channel low pass filter according to claim 1, is characterized in that described switch-capacitor filtering module is comprised of switch-capacitor filtering chip and peripheral circuit.
5. according to a kind of Multi-channel low pass filter claimed in claim 1, it is characterized in that described power module is comprised of voltage stabilizing circuit, the first inductance isolation and capacitor filter, the second inductance isolation and capacitor filter, the 3rd inductance isolation and capacitor filter, the 4th inductance isolation and capacitor filter, voltage conversion circuit and binding post, voltage stabilizing chip and peripheral circuit that described voltage stabilizing circuit is L7805 by model form.
6. according to a kind of Multi-channel low pass filter described in any one in claim 1～5, between signal amplification module described in it is characterized in that and described switch-capacitor filtering module, be provided with voltage follow module, the signal input part of described voltage follow module is connected with the signal output part of described signal amplification module, the signal output part of described voltage follow module is connected with the signal input part of described switch-capacitor filtering module, and the power input of described voltage follow module is connected with described power module.
7. a kind of Multi-channel low pass filter according to claim 6, it is characterized in that described voltage follow module is by four high guaily unit chip, the 6th resistance, the 7th resistance, the 8th resistance, the 4th electric capacity and the second variable capacitance diode form, the in-phase signal input of described four high guaily unit chip is by the 8th described grounding through resistance, the inversion signal input of described four high guaily unit chip is connected with one end of the 7th described resistance, the other end of the 7th described resistance is by the 4th described capacity earth, the inversion signal input of described four high guaily unit chip is connected with the signal output part of described four high guaily unit chip by the 6th described resistance, the anodic bonding of the signal output part of described four high guaily unit chip and the second described variable capacitance diode, the minus earth of the second described variable capacitance diode.
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| CN201110257960.2A CN102355228B (en) | 2011-09-02 | 2011-09-02 | Multi-channel lowpass filter |
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| CN108259021A (en) * | 2018-01-10 | 2018-07-06 | 广西师范大学 | A kind of CMOS broadbands distribution variable band-pass filter |
| CN108900176A (en) * | 2018-09-20 | 2018-11-27 | 无锡吉兴汽车声学部件科技有限公司 | A kind of adjustable bandpass filter of two channel central frequencies |
Citations (4)
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|---|---|---|---|---|
| JP2005057332A (en) * | 2003-08-04 | 2005-03-03 | Tdk Corp | Filter apparatus and branching apparatus employing the same |
| CN2684463Y (en) * | 2004-01-19 | 2005-03-09 | 汤承昭 | Signal controlling circuit for household appliance security inspection instrument |
| CN201039087Y (en) * | 2007-02-06 | 2008-03-19 | 青岛海信电器股份有限公司 | An onboard power amplification circuit |
| CN202218204U (en) * | 2011-09-02 | 2012-05-09 | 宁波杉工结构监测与控制工程中心有限公司 | Multi-channel low pass filter |
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| US8466744B2 (en) * | 2009-10-08 | 2013-06-18 | Bryston-Omegaleap Partners | Amplifier and signal filter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005057332A (en) * | 2003-08-04 | 2005-03-03 | Tdk Corp | Filter apparatus and branching apparatus employing the same |
| CN2684463Y (en) * | 2004-01-19 | 2005-03-09 | 汤承昭 | Signal controlling circuit for household appliance security inspection instrument |
| CN201039087Y (en) * | 2007-02-06 | 2008-03-19 | 青岛海信电器股份有限公司 | An onboard power amplification circuit |
| CN202218204U (en) * | 2011-09-02 | 2012-05-09 | 宁波杉工结构监测与控制工程中心有限公司 | Multi-channel low pass filter |
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