CN111371418A - Control circuit for environmental noise detector and sound-electricity conversion suppression method - Google Patents
Control circuit for environmental noise detector and sound-electricity conversion suppression method Download PDFInfo
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Abstract
The invention discloses a control circuit for an environmental noise detector and an acoustoelectric conversion suppression method, which comprise the following steps: the detection device comprises a noise collection module, an acoustoelectric filtering conversion module, an electric signal regulation module and a frequency and voltage stabilizing module, wherein a resistor R2 and a resistor R6 in the noise collection module form a parallel circuit, and the detection precision can be improved after parallel connection due to the dispersity of resistance values; the acoustoelectric filtering conversion module acquires a feedback signal of the noise collection module, an operational amplifier U2 filters voltage ripple generated by an acoustoelectric converter U4, and one end of a capacitor C3 is grounded to eliminate redundant signals generated during operation of the operational amplifier U2; the electric signal adjusting module adopts a plurality of parallel resistors consisting of a resistor R11 and a resistor R10 which are connected in parallel and a resistor R13 and a resistor R14 which are connected in parallel, so that temperature drift can be inhibited, and errors generated during signal conversion can be reduced; the oscillation unit in the frequency and voltage stabilizing module controls the current which changes periodically, and the conduction of data is controlled by the triode Q2, so that the precision of the detecting instrument is improved.
Description
Technical Field
The invention relates to the technical field of noise detection, in particular to a control circuit for an environmental noise detector and an acousto-electric conversion suppression method.
Background
The noise detector is used for detecting and testing noise in a working site and a public place, noise pollution is one of environment pollution with larger influence, noise with higher decibel can even cause serious damage to the eardrum of a person and can cause hearing loss seriously, the noise detector can provide noise with decibel so as to take related measures to control and reduce the noise, and higher requirements are also provided for the precision of the noise detector and the conversion control of detection data.
The existing environmental noise detector can not maintain the stability of detection data when detecting the environment generating noise, has low detection precision, thereby causing transmission error data to influence the judgment of noise pollution parameter level, and can not filter redundant frequency band signals generated in signal conversion equipment when performing electric signal conversion on the obtained sound wave signals, thereby causing low sound-electricity conversion efficiency to influence the accuracy of the detection data; when the environment detector continuously detects a certain section of environment, the temperature of an internal device rises, so that the parameters of the semiconductor device are changed, and the temperature drift phenomenon cannot be inhibited; during data signal conversion and component operation, interference sources can be generated, and the interference sources can be transmitted to main transmission data to influence the device in operation so that the conversion data and the transmission data are changed.
Disclosure of Invention
The purpose of the invention is as follows: a control circuit for an environmental noise detector is provided to solve the above problems.
The technical scheme is as follows: a control circuit for an ambient noise detector, comprising:
a noise collection module for collecting the environmental sound to be detected by the noise sensor MK 1;
the sound-electricity filtering conversion module is used for carrying out sound-electricity conversion on the collected sound and adjusting the quality of output data through filtering;
the telecommunication high-regulation module is used for regulating the converted electric signal so as to improve the detection quality;
and the frequency and voltage stabilizing module is used for receiving the signal fed back by the electric signal adjusting module and stabilizing the detection value through frequency and voltage stabilization.
According to one aspect of the invention, the resistor R2 and the resistor R6 in the noise collection module form a parallel circuit, and due to the dispersion of resistance values, the detection accuracy can be improved after the parallel connection;
the acoustoelectric filtering conversion module acquires a feedback signal of the noise collection module, an operational amplifier U2 filters voltage ripple generated by an acoustoelectric converter U4, and one end of a capacitor C3 is grounded to eliminate redundant signals generated during operation of the operational amplifier U2;
the electric signal adjusting module adopts a plurality of parallel resistors consisting of a resistor R11 and a resistor R10 which are connected in parallel and a resistor R13 and a resistor R14 which are connected in parallel, so that temperature drift can be inhibited, and errors generated during signal conversion can be reduced;
the oscillation unit in the frequency and voltage stabilizing module controls the current which changes periodically, and the conduction of the data is controlled by the non-contact switch through the triode Q2, so that the precision of the detecting instrument is improved.
According to an aspect of the present invention, the acousto-electric conversion suppressing unit includes a resistor R1, a resistor R22, an operational amplifier U5, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C16, a diode D7, a diode D6, wherein one end of the resistor R21 is connected to an INPUT electrical signal INPUT; the other end of the resistor R21 is respectively connected with one end of a resistor R22 and a pin 3 of an operational amplifier U5; the other end of the resistor R22 is connected with a power supply + 6V; pin 7 of the operational amplifier U5 is connected with +5V of a power supply; pin 4 of the operational amplifier U5 is connected with a ground wire GND; the pin 2 of the operational amplifier U5 is respectively connected with one end of a resistor R23 and one end of a resistor R24; the other end of the resistor R23 is connected with a ground wire GND; the other end of the resistor R24 is respectively connected with a pin 6 of an operational amplifier U5 and one end of a resistor R25; the other end of the resistor R25 is respectively connected with one end of a resistor R26, one end of a capacitor C16, the positive end of a diode D6, the negative end of a diode D7 and an OUTPUT electrical signal OUTPUT; the negative end of the diode D6 is connected with +9V of a power supply; the other end of the resistor R26 is respectively connected with the other end of the capacitor C16, the positive end of the diode D7 and the ground wire GND.
According to one aspect of the invention, the noise collection module comprises a noise sensor MK1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, an operational amplifier U1, a resistor R5 and a resistor R6, wherein one end of the noise sensor MK1 is connected with the negative end of the capacitor C1; the other end of the noise sensor MK1 is connected with one end of a resistor R3, a pin 4 of an operational amplifier U1, one end of a resistor R6 and a ground wire GND respectively; the positive end of the capacitor C1 is connected with one end of a resistor R1; the other end of the resistor R1 is connected with a pin 3 of an operational amplifier U1; the other end of the resistor R3 is respectively connected with a pin 2 of an operational amplifier U1, one end of a resistor R4 and one end of a resistor R2; the other end of the resistor R2 is respectively connected with one end of a resistor R5, a pin 7 of an operational amplifier U1 and a power supply + 6V; the other end of the resistor R5 is connected with the other end of the resistor R6; the other end of the resistor R4 is connected with pin 6 of an operational amplifier U1.
According to one aspect of the invention, the acoustic-electric filtering conversion module comprises a resistor R7, a resistor R8, a capacitor C2, a capacitor C3, an operational amplifier U2, a resistor R9, an acoustic-electric converter U4 and a capacitor C4, wherein one end of the resistor R7 is respectively connected with the other end of the resistor R4 and a pin 6 of the operational amplifier U1; the other end of the resistor R7 is respectively connected with one end of a resistor R8 and one end of a capacitor C2; the other end of the resistor R8 is respectively connected with one end of a capacitor C3 and a pin 3 of an operational amplifier U2; the other end of the capacitor C3 is connected with a ground wire GND; the other end of the capacitor C2 is respectively connected with a pin 2 and a pin 6 of an operational amplifier U2 and one end of a resistor R9; pin 4 of the operational amplifier U2 is connected with +5V of a power supply; pin 7 of the operational amplifier U2 is connected with a ground wire GND; the other end of the resistor R9 is respectively connected with pin 1 of an acoustic-electric converter U4 and one end of a capacitor C4; and pin 2 of the acoustic-electric converter U4 is connected with a ground wire GND.
According to one aspect of the invention, the electric signal adjusting module comprises a capacitor C5, an operational amplifier U3, a resistor R10, a resistor R11, a capacitor C6, a resistor R12, a resistor R12, a resistor R13, a diode D1, a diode D2, a resistor R15, a diode D3 and a capacitor C7, wherein a pin 2 of the operational amplifier U3 is respectively connected with one end of the resistor R10, one end of the resistor R11 and the other end of the capacitor C4; the pin 3 of the operational amplifier U3 is connected with one end of a capacitor C5; the other end of the capacitor C5 is connected with a ground wire GND; pin 7 of the operational amplifier U3 is connected with +5V of a power supply; the pin 6 of the operational amplifier U3 is respectively connected with the other end of the resistor R10, one end of the capacitor C6 and one end of the resistor R12; the other end of the capacitor C6 is connected with the other end of the resistor R11; the other end of the resistor R12 is respectively connected with the positive end of the diode D3, the positive end of the diode D1, the negative end of the diode D2, one end of the resistor R15, one end of the resistor R13 and one end of the resistor R14; the other end of the resistor R13 is connected with the cathode end of the diode D1; the other end of the resistor R14 is connected with the positive end of a diode D2; the other end of the resistor R15 is connected with a ground wire GND; the negative end of the diode D3 is connected with the positive end of the capacitor C7; the negative terminal of the capacitor C7 is connected with the ground GND.
According to one aspect of the invention, the frequency and voltage stabilizing module comprises an inductor L1, a transistor Q1, a capacitor C8, a triode Q4, a resistor R16, a diode D4, a capacitor C9, a diode D5, a capacitor C15, a resistor R17 and a triode Q2, wherein a pin 3 of the transistor Q1 is respectively connected with the other end of the resistor R12, the positive end of the diode D3, the positive end of the diode D1, the negative end of the diode D2, one end of the resistor R15, one end of the resistor R13 and one end of the resistor R14; pin 2 of the transistor Q1 is connected with a base terminal of a triode Q4; the pin 1 of the transistor Q1 is respectively connected with one end of a capacitor C8 and one end of an inductor L1; the other end of the inductor L1 is connected with +9V of a power supply; the other end of the capacitor C8 is respectively connected with one end of a resistor R16, a collector end of a triode Q4 and one end of a capacitor C9; the other end of the resistor R16 is respectively connected with the positive end of a diode D5 and the negative end of a diode D4; the emitter terminal of the triode Q4 is respectively connected with the positive terminal of the diode D4 and the ground wire GND; the other end of the capacitor C9 is respectively connected with a base electrode end of a triode Q2 and one end of a resistor R17; the other end of the resistor R17 is respectively connected with the negative end of the capacitor C15 and the OUTPUT port OUTPUT; the emitter terminal of the triode Q2 is connected with the positive terminal of the capacitor C15.
According to one aspect of the invention, the oscillating unit comprises a capacitor C10, a resistor R19, a diode D8, a lamp LED1, a triode Q3, a capacitor C11 and a resistor R18, wherein the positive terminal of the capacitor C10 is respectively connected with one end of the resistor R19, the positive terminal of the lamp LED1, one end of the resistor R18, the base terminal of the triode Q2 and the negative terminal of the diode D5; the negative end of the capacitor C10 is respectively connected with the negative end of the diode D8, the emitter end of the triode Q3, the negative end of the capacitor C11, the emitter end of the triode Q2, the positive end of the capacitor C15, the emitter end of the triode Q4, the positive end of the diode D8 and the ground wire GND; the positive end of the capacitor C11 is respectively connected with the other end of the resistor R18 and the base end of the triode Q3; the collector terminal of the triode Q3 is connected with the cathode terminal of the lamp LED 1; the other end of the resistor R19 is connected with the positive end of the diode D8.
According to one aspect of the invention, the capacitor C3 is an electrolytic capacitor; the diode D4, the diode D5 and the diode D8 are all voltage-stabilizing diodes; the model of the triode Q2, the model of the triode Q3 and the model of the triode Q4 are NPN; the noise sensor MK1 is TZ-2 KA.
According to one aspect of the present invention, an acousto-electric conversion suppression method for an environmental noise detector control circuit is characterized in that an acousto-electric conversion suppression module controls a current which changes after conversion through an acousto-electric filtering conversion module, and then filters the current through an operational amplifier U5, and the specific steps are as follows:
step 2, the resistor 24 and the resistor R25 are connected in series to inhibit temperature drift of the resistor and reduce heat, the capacitor R26 and the capacitor C16 form a parallel circuit, oscillation of the circuit is inhibited, the resistor R26 absorbs electric energy stored by the capacitor C16 and prevents the capacitor C16 from overlarge discharge current to avoid damaging a connecting device, the diode D7 and the diode D6 have one-way conductivity, the diode D7 controls the conduction direction of the electric energy stored by the capacitor C16, and the negative end of the diode D6 obtains +9V of a power supply, so that the transmission speed of surge current inhibition is improved.
Has the advantages that: the invention designs a control circuit and an acoustoelectric conversion suppression method for an environmental noise detector, which can not maintain the stability of detection data when detecting an environment generating noise, and an operational amplifier U1 in a noise collection module is combined with noise collection to form a noise collection operation module, so that an output signal is stable, and a resistor R2 and a resistor R6 form a resistor parallel circuit, so that the detection precision is improved by utilizing the dispersity of a resistance value in parallel connection; when the acquired sound wave signals are subjected to electric signal conversion, redundant frequency bands generated in the signal conversion cannot be filtered, ripples generated by an acoustic-electric converter U4 are filtered through an operational amplifier U2 in an acoustic-electric filtering conversion module, redundant signals generated in the operation of the amplifier U2 are eliminated through grounding of one end of a capacitor C3, the acoustic-electric conversion efficiency is improved through multi-layer filtering, and the converted data are accurate; when the noise detection is continuously carried out on a certain section of environment, an operating device can continuously flow along with the current, so that the surface temperature of the device is increased, and the temperature drift phenomenon occurs; an interference source generated in data conversion and component operation forms an anti-interference circuit through a diode D3 and a capacitor C7, and transmission of filtering interference signals is blocked.
Drawings
Fig. 1 is a block diagram of the present invention.
FIG. 2 is a diagram of the noise detector control circuit distribution of the present invention.
Fig. 3 is a circuit diagram of the acoustoelectric filter conversion module of the present invention.
Fig. 4 is a circuit diagram of a frequency and voltage stabilizing module of the present invention.
Fig. 5 is a circuit diagram of the acoustic-electric conversion suppressing unit of the present invention.
Detailed Description
In this embodiment, as shown in fig. 1, a control circuit for an ambient noise detector includes:
a noise collection module for collecting the environmental sound to be detected by the noise sensor MK 1;
the sound-electricity filtering conversion module is used for carrying out sound-electricity conversion on the collected sound and adjusting the quality of output data through filtering;
the telecommunication high-regulation module is used for regulating the converted electric signal so as to improve the detection quality;
and the frequency and voltage stabilizing module is used for receiving the signal fed back by the electric signal adjusting module and stabilizing the detection value through frequency and voltage stabilization.
In a further embodiment, as shown in fig. 2, the resistor R2 and the resistor R6 in the noise collection module form a parallel circuit, and due to the dispersion of resistance values, the detection accuracy can be improved after the parallel connection;
the acoustoelectric filtering conversion module acquires a feedback signal of the noise collection module, an operational amplifier U2 filters voltage ripple generated by an acoustoelectric converter U4, and one end of a capacitor C3 is grounded to eliminate redundant signals generated during operation of the operational amplifier U2;
the electric signal adjusting module adopts a plurality of parallel resistors consisting of a resistor R11 and a resistor R10 which are connected in parallel and a resistor R13 and a resistor R14 which are connected in parallel, so that temperature drift can be inhibited, and errors generated during signal conversion can be reduced;
the oscillation unit in the frequency and voltage stabilizing module controls the current which changes periodically, and the conduction of the data is controlled by the non-contact switch through the triode Q2, so that the precision of the detecting instrument is improved.
In a further embodiment, as shown in fig. 5, the acoustic-electric conversion suppressing unit includes a resistor R1, a resistor R22, an operational amplifier U5, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C16, a diode D7, and a diode D6.
In a further embodiment, one end of the resistor R21 in the sound-electricity conversion suppression unit is connected to the INPUT electrical signal INPUT; the other end of the resistor R21 is respectively connected with one end of a resistor R22 and a pin 3 of an operational amplifier U5; the other end of the resistor R22 is connected with a power supply + 6V; pin 7 of the operational amplifier U5 is connected with +5V of a power supply; pin 4 of the operational amplifier U5 is connected with a ground wire GND; the pin 2 of the operational amplifier U5 is respectively connected with one end of a resistor R23 and one end of a resistor R24; the other end of the resistor R23 is connected with a ground wire GND; the other end of the resistor R24 is respectively connected with a pin 6 of an operational amplifier U5 and one end of a resistor R25; the other end of the resistor R25 is respectively connected with one end of a resistor R26, one end of a capacitor C16, the positive end of a diode D6, the negative end of a diode D7 and an OUTPUT electrical signal OUTPUT; the negative end of the diode D6 is connected with +9V of a power supply; the other end of the resistor R26 is respectively connected with the other end of the capacitor C16, the positive end of the diode D7 and the ground wire GND.
In a further embodiment, the noise collection module includes a noise sensor MK1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, an operational amplifier U1, a resistor R5, and a resistor R6.
In a further embodiment, one end of the noise sensor MK1 in the noise collection module is connected to the negative end of the capacitor C1; the other end of the noise sensor MK1 is connected with one end of a resistor R3, a pin 4 of an operational amplifier U1, one end of a resistor R6 and a ground wire GND respectively; the positive end of the capacitor C1 is connected with one end of a resistor R1; the other end of the resistor R1 is connected with a pin 3 of an operational amplifier U1; the other end of the resistor R3 is respectively connected with a pin 2 of an operational amplifier U1, one end of a resistor R4 and one end of a resistor R2; the other end of the resistor R2 is respectively connected with one end of a resistor R5, a pin 7 of an operational amplifier U1 and a power supply + 6V; the other end of the resistor R5 is connected with the other end of the resistor R6; the other end of the resistor R4 is connected with pin 6 of an operational amplifier U1.
In a further embodiment, as shown in fig. 3, the acoustoelectric filtering conversion module includes a resistor R7, a resistor R8, a capacitor C2, a capacitor C3, an operational amplifier U2, a resistor R9, an acoustoelectric converter U4, and a capacitor C4.
In a further embodiment, one end of the resistor R7 in the acoustic-electric filtering conversion module is respectively connected with the other end of the resistor R4 and the pin 6 of the operational amplifier U1; the other end of the resistor R7 is respectively connected with one end of a resistor R8 and one end of a capacitor C2; the other end of the resistor R8 is respectively connected with one end of a capacitor C3 and a pin 3 of an operational amplifier U2; the other end of the capacitor C3 is connected with a ground wire GND; the other end of the capacitor C2 is respectively connected with a pin 2 and a pin 6 of an operational amplifier U2 and one end of a resistor R9; pin 4 of the operational amplifier U2 is connected with +5V of a power supply; pin 7 of the operational amplifier U2 is connected with a ground wire GND; the other end of the resistor R9 is respectively connected with pin 1 of an acoustic-electric converter U4 and one end of a capacitor C4; and pin 2 of the acoustic-electric converter U4 is connected with a ground wire GND.
In a further embodiment, the electric signal conditioning module includes a capacitor C5, an operational amplifier U3, a resistor R10, a resistor R11, a capacitor C6, a resistor R12, a resistor R12, a resistor R13, a diode D1, a diode D2, a resistor R15, a diode D3, and a capacitor C7.
In a further embodiment, the pin 2 of the operational amplifier U3 in the electrical signal conditioning module is respectively connected to one end of a resistor R10, one end of a resistor R11 and the other end of a capacitor C4; the pin 3 of the operational amplifier U3 is connected with one end of a capacitor C5; the other end of the capacitor C5 is connected with a ground wire GND; pin 7 of the operational amplifier U3 is connected with +5V of a power supply; the pin 6 of the operational amplifier U3 is respectively connected with the other end of the resistor R10, one end of the capacitor C6 and one end of the resistor R12; the other end of the capacitor C6 is connected with the other end of the resistor R11; the other end of the resistor R12 is respectively connected with the positive end of the diode D3, the positive end of the diode D1, the negative end of the diode D2, one end of the resistor R15, one end of the resistor R13 and one end of the resistor R14; the other end of the resistor R13 is connected with the cathode end of the diode D1; the other end of the resistor R14 is connected with the positive end of a diode D2; the other end of the resistor R15 is connected with a ground wire GND; the negative end of the diode D3 is connected with the positive end of the capacitor C7; the negative terminal of the capacitor C7 is connected with the ground GND.
In a further embodiment, as shown in fig. 4, the frequency stabilization and voltage stabilization module includes an inductor L1, a transistor Q1, a capacitor C8, a transistor Q4, a resistor R16, a diode D4, a capacitor C9, a diode D5, a capacitor C15, a resistor R17, and a transistor Q2.
In a further embodiment, the pin 3 of the transistor Q1 in the frequency stabilizing and voltage stabilizing module is respectively connected to the other end of the resistor R12, the positive end of the diode D3, the positive end of the diode D1, the negative end of the diode D2, one end of the resistor R15, one end of the resistor R13, and one end of the resistor R14; pin 2 of the transistor Q1 is connected with a base terminal of a triode Q4; the pin 1 of the transistor Q1 is respectively connected with one end of a capacitor C8 and one end of an inductor L1; the other end of the inductor L1 is connected with +9V of a power supply; the other end of the capacitor C8 is respectively connected with one end of a resistor R16, a collector end of a triode Q4 and one end of a capacitor C9; the other end of the resistor R16 is respectively connected with the positive end of a diode D5 and the negative end of a diode D4; the emitter terminal of the triode Q4 is respectively connected with the positive terminal of the diode D4 and the ground wire GND; the other end of the capacitor C9 is respectively connected with a base electrode end of a triode Q2 and one end of a resistor R17; the other end of the resistor R17 is respectively connected with the negative end of the capacitor C15 and the OUTPUT port OUTPUT; the emitter terminal of the triode Q2 is connected with the positive terminal of the capacitor C15.
In a further embodiment, the oscillating unit comprises a capacitor C10, a resistor R19, a diode D4, a lamp LED1, a transistor Q3, a capacitor C11, and a resistor R18.
In a further embodiment, the positive terminal of the capacitor C10 in the oscillating unit is connected to one terminal of the resistor R19, the positive terminal of the lamp LED1, one terminal of the resistor R18, the base terminal of the transistor Q2, and the negative terminal of the diode D5, respectively; the negative end of the capacitor C10 is respectively connected with the negative end of the diode D8, the emitter end of the triode Q3, the negative end of the capacitor C11, the emitter end of the triode Q2, the positive end of the capacitor C15, the emitter end of the triode Q4, the positive end of the diode D8 and the ground wire GND; the positive end of the capacitor C11 is respectively connected with the other end of the resistor R18 and the base end of the triode Q3; the collector terminal of the triode Q3 is connected with the cathode terminal of the lamp LED 1; the other end of the resistor R19 is connected with the positive end of the diode D8.
In a further embodiment, the capacitor C3 is an electrolytic capacitor; the diode D4, the diode D5 and the diode D8 are all voltage-stabilizing diodes; the model of the triode Q2, the model of the triode Q3 and the model of the triode Q4 are NPN; the noise sensor MK1 is TZ-2 KA.
In a further embodiment, a sound-electricity conversion suppression method for an environmental noise detector control circuit is characterized in that a sound-electricity conversion suppression module controls a current which changes after conversion through a sound-electricity filtering conversion module, and then the current is filtered through an operational amplifier U5, and the specific steps are as follows:
step 2, the resistor 24 and the resistor R25 are connected in series to inhibit temperature drift of the resistor and reduce heat, the capacitor R26 and the capacitor C16 form a parallel circuit, oscillation of the circuit is inhibited, the resistor R26 absorbs electric energy stored by the capacitor C16 and prevents the capacitor C16 from overlarge discharge current to avoid damaging a connecting device, the diode D7 and the diode D6 have one-way conductivity, the diode D7 controls the conduction direction of the electric energy stored by the capacitor C16, and the negative end of the diode D6 obtains +9V of a power supply, so that the transmission speed of surge current inhibition is improved.
In summary, the present invention has the following advantages: the noise sensor MK1 collects sound wave signals sent by the outside, a capacitor C1 and a resistor R1 are connected in series to form a voltage-stabilizing power supply circuit, so that the power supply voltage of the noise sensor MK1 in the working process is stable, a resistor R3, a resistor R2, a resistor R5 and a resistor R6 form a parallel circuit, the detection precision can be improved after the parallel connection due to the dispersity of resistance values, and the resistor R4 is connected with an operational amplifier U1 in parallel to enable the operational amplifier to be in a non-normal working state of stably preventing operation from being cut off or in saturation conduction when in working; the resistor R7 and the resistor R8 are connected in series to form a resistance value with small conversion parameters, so that the transmission quality of detected data is improved, the capacitor C2 obtains stored electric energy to maintain the stability of voltage in the circuit, the operational amplifier U2 filters voltage ripples generated by the acoustic-electric converter U4, one end of the capacitor C3 is grounded to eliminate redundant signals generated during operation of the operational amplifier U2, and the capacitor C4 performs system tuning on a circuit related to frequency; the resistor R11 and the resistor R10 are connected in parallel, the resistor R13 and the resistor R14 form a plurality of parallel resistors, so that temperature drift can be inhibited, errors generated during signal conversion are reduced, the capacitor C5 filters redundant signals generated by operation amplification U3, the resistor R11 supplies power to the capacitor C6 through acquired voltage for release when the voltage in the circuit is unstable, the diode D1 and the diode D2 limit the direction of data transmission, accordingly, damaged signals are adjusted, the diode 3 and the capacitor C7 form an anti-interference circuit, and transmission of filtered interference signals is blocked; the triode Q4 is used for carrying out voltage stabilization treatment on the obtained voltage through a contactless switch, the diode D4 and the diode D5 keep the stability of output voltage, the resistor R19 and the diode D8 are connected in series to control current which changes periodically, and the triode Q2 is used for realizing data conduction according to the obtained conduction voltage value, so that the precision of the detection instrument is improved, and the quality of data signal transmission is improved.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (9)
1. A control circuit for an environmental noise detector is characterized by comprising the following modules:
a noise collection module for collecting the environmental sound to be detected by the noise sensor MK 1;
the sound-electricity filtering conversion module is used for carrying out sound-electricity conversion on the collected sound and adjusting the quality of output data through filtering;
the telecommunication high-regulation module is used for regulating the converted electric signal so as to improve the detection quality;
and the frequency and voltage stabilizing module is used for receiving the signal fed back by the electric signal adjusting module and stabilizing the detection value through frequency and voltage stabilization.
2. The control circuit for the environmental noise detector according to claim 1, wherein the resistor R2 and the resistor R6 in the noise collection module form a parallel circuit, and the detection accuracy can be improved after the parallel circuit due to the dispersion of the resistance values;
the acoustoelectric filtering conversion module acquires a feedback signal of the noise collection module, an operational amplifier U2 filters voltage ripple generated by an acoustoelectric converter U4, and one end of a capacitor C3 is grounded to eliminate redundant signals generated during operation of the operational amplifier U2;
the electric signal adjusting module adopts a plurality of parallel resistors consisting of a resistor R11 and a resistor R10 which are connected in parallel and a resistor R13 and a resistor R14 which are connected in parallel, so that temperature drift can be inhibited, and errors generated during signal conversion can be reduced;
the oscillation unit in the frequency and voltage stabilizing module controls the current which changes periodically, and the conduction of the data is controlled by the non-contact switch through the triode Q2, so that the precision of the detecting instrument is improved.
3. The control circuit for an environmental noise detector according to claim 1, wherein the acousto-electric filter conversion module comprises: an acoustic-electric conversion suppression unit; the sound-electricity conversion suppression unit comprises a resistor R1, a resistor R22, an operational amplifier U5, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C16, a diode D7 and a diode D6, wherein one end of the resistor R21 is connected with an INPUT electrical signal INPUT; the other end of the resistor R21 is respectively connected with one end of a resistor R22 and a pin 3 of an operational amplifier U5; the other end of the resistor R22 is connected with a power supply + 6V; pin 7 of the operational amplifier U5 is connected with +5V of a power supply; pin 4 of the operational amplifier U5 is connected with a ground wire GND; the pin 2 of the operational amplifier U5 is respectively connected with one end of a resistor R23 and one end of a resistor R24; the other end of the resistor R23 is connected with a ground wire GND; the other end of the resistor R24 is respectively connected with a pin 6 of an operational amplifier U5 and one end of a resistor R25; the other end of the resistor R25 is respectively connected with one end of a resistor R26, one end of a capacitor C16, the positive end of a diode D6, the negative end of a diode D7 and an OUTPUT electrical signal OUTPUT; the negative end of the diode D6 is connected with +9V of a power supply; the other end of the resistor R26 is respectively connected with the other end of the capacitor C16, the positive end of the diode D7 and the ground wire GND.
4. The control circuit for the environmental noise detector according to claim 1, wherein the noise collection module comprises a noise sensor MK1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, an operational amplifier U1, a resistor R5 and a resistor R6, wherein one end of the noise sensor MK1 is connected with the negative end of the capacitor C1; the other end of the noise sensor MK1 is connected with one end of a resistor R3, a pin 4 of an operational amplifier U1, one end of a resistor R6 and a ground wire GND respectively; the positive end of the capacitor C1 is connected with one end of a resistor R1; the other end of the resistor R1 is connected with a pin 3 of an operational amplifier U1; the other end of the resistor R3 is respectively connected with a pin 2 of an operational amplifier U1, one end of a resistor R4 and one end of a resistor R2; the other end of the resistor R2 is respectively connected with one end of a resistor R5, a pin 7 of an operational amplifier U1 and a power supply + 6V; the other end of the resistor R5 is connected with the other end of the resistor R6; the other end of the resistor R4 is connected with pin 6 of an operational amplifier U1.
5. The control circuit for the environmental noise detector according to claim 1, wherein the acoustic-electric filtering conversion module comprises a resistor R7, a resistor R8, a capacitor C2, a capacitor C3, an operational amplifier U2, a resistor R9, an acoustic-electric converter U4 and a capacitor C4, wherein one end of the resistor R7 is connected to the other end of the resistor R4 and a pin 6 of the operational amplifier U1, respectively; the other end of the resistor R7 is respectively connected with one end of a resistor R8 and one end of a capacitor C2; the other end of the resistor R8 is respectively connected with one end of a capacitor C3 and a pin 3 of an operational amplifier U2; the other end of the capacitor C3 is connected with a ground wire GND; the other end of the capacitor C2 is respectively connected with a pin 2 and a pin 6 of an operational amplifier U2 and one end of a resistor R9; pin 4 of the operational amplifier U2 is connected with +5V of a power supply; pin 7 of the operational amplifier U2 is connected with a ground wire GND; the other end of the resistor R9 is respectively connected with pin 1 of an acoustic-electric converter U4 and one end of a capacitor C4; and pin 2 of the acoustic-electric converter U4 is connected with a ground wire GND.
6. The control circuit for the environmental noise detector according to claim 1, wherein the electric signal conditioning module comprises a capacitor C5, an operational amplifier U3, a resistor R10, a resistor R11, a capacitor C6, a resistor R12, a resistor R12, a resistor R13, a diode D1, a diode D2, a resistor R15, a diode D3 and a capacitor C7, wherein a pin 2 of the operational amplifier U3 is connected to one end of the resistor R10, one end of the resistor R11 and the other end of the capacitor C4 respectively; the pin 3 of the operational amplifier U3 is connected with one end of a capacitor C5; the other end of the capacitor C5 is connected with a ground wire GND; pin 7 of the operational amplifier U3 is connected with +5V of a power supply; the pin 6 of the operational amplifier U3 is respectively connected with the other end of the resistor R10, one end of the capacitor C6 and one end of the resistor R12; the other end of the capacitor C6 is connected with the other end of the resistor R11; the other end of the resistor R12 is respectively connected with the positive end of the diode D3, the positive end of the diode D1, the negative end of the diode D2, one end of the resistor R15, one end of the resistor R13 and one end of the resistor R14; the other end of the resistor R13 is connected with the cathode end of the diode D1; the other end of the resistor R14 is connected with the positive end of a diode D2; the other end of the resistor R15 is connected with a ground wire GND; the negative end of the diode D3 is connected with the positive end of the capacitor C7; the negative terminal of the capacitor C7 is connected with the ground GND.
7. The control circuit for the environmental noise detector according to claim 1, wherein the frequency stabilizing and voltage stabilizing module comprises an inductor L1, a transistor Q1, a capacitor C8, a transistor Q4, a resistor R16, a diode D4, a capacitor C9, a diode D5, a capacitor C15, a resistor R17 and a transistor Q2, wherein pin 3 of the transistor Q1 is connected to the other end of the resistor R12, the positive terminal of the diode D3, the positive terminal of the diode D1, the negative terminal of the diode D2, one end of the resistor R15, one end of the resistor R13 and one end of the resistor R14, respectively; pin 2 of the transistor Q1 is connected with a base terminal of a triode Q4; the pin 1 of the transistor Q1 is respectively connected with one end of a capacitor C8 and one end of an inductor L1; the other end of the inductor L1 is connected with +9V of a power supply; the other end of the capacitor C8 is respectively connected with one end of a resistor R16, a collector end of a triode Q4 and one end of a capacitor C9; the other end of the resistor R16 is respectively connected with the positive end of a diode D5 and the negative end of a diode D4; the emitter terminal of the triode Q4 is respectively connected with the positive terminal of the diode D4 and the ground wire GND; the other end of the capacitor C9 is respectively connected with a base electrode end of a triode Q2 and one end of a resistor R17; the other end of the resistor R17 is respectively connected with the negative end of the capacitor C15 and the OUTPUT port OUTPUT; the emitter terminal of the triode Q2 is connected with the positive terminal of the capacitor C15.
8. The ambient noise detector control circuit of claim 7, wherein the frequency and voltage stabilization module comprises: an oscillation unit; the oscillating unit comprises a capacitor C10, a resistor R19, a diode D8, a lamp LED1, a triode Q3, a capacitor C11 and a resistor R18, wherein the positive end of the capacitor C10 is respectively connected with one end of the resistor R19, the positive end of the lamp LED1, one end of the resistor R18, the base end of the triode Q2 and the negative end of the diode D5; the negative end of the capacitor C10 is respectively connected with the negative end of the diode D8, the emitter end of the triode Q3, the negative end of the capacitor C11, the emitter end of the triode Q2, the positive end of the capacitor C15, the emitter end of the triode Q4, the positive end of the diode D8 and the ground wire GND; the positive end of the capacitor C11 is respectively connected with the other end of the resistor R18 and the base end of the triode Q3; the collector terminal of the triode Q3 is connected with the cathode terminal of the lamp LED 1; the other end of the resistor R19 is connected with the positive end of the diode D8.
9. The method for suppressing the sound-electricity conversion of the control circuit of the environmental noise detector according to claim 3, wherein the sound-electricity conversion suppression module controls the current which changes after the conversion through the sound-electricity filter conversion module, and further filters the current through an operational amplifier U5, and the method comprises the following specific steps:
step 1, one end of a resistor R21 receives surge current generated by an acousto-electric filtering conversion module through an INPUT electric signal INPUT, a power supply +6V is additionally added through a resistor R22 to further improve the response of resistance, the surge current is reduced to a range allowing conduction, an operational amplifier U5 performs addition and subtraction operation on the INPUT signal according to the value of an output signal to meet the output requirement, and a resistor R23 is grounded to protect detection equipment and disperse current when the current is too large in the operation of the operational amplifier U5;
step 2, the resistor 24 and the resistor R25 are connected in series to inhibit temperature drift of the resistor and reduce heat, the capacitor R26 and the capacitor C16 form a parallel circuit, oscillation of the circuit is inhibited, the resistor R26 absorbs electric energy stored by the capacitor C16 and prevents the capacitor C16 from overlarge discharge current to avoid damaging a connecting device, the diode D7 and the diode D6 have one-way conductivity, the diode D7 controls the conduction direction of the electric energy stored by the capacitor C16, and the negative end of the diode D6 obtains +9V of a power supply, so that the transmission speed of surge current inhibition is improved.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010306108.9A CN111371418A (en) | 2020-04-17 | 2020-04-17 | Control circuit for environmental noise detector and sound-electricity conversion suppression method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010306108.9A CN111371418A (en) | 2020-04-17 | 2020-04-17 | Control circuit for environmental noise detector and sound-electricity conversion suppression method |
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| CN111371418A true CN111371418A (en) | 2020-07-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186709A (en) * | 2020-08-26 | 2021-01-05 | 南京龙渊众创信息科技股份有限公司 | Anti-static protection system and protection method for communication of Internet of things |
| CN112185037A (en) * | 2020-08-26 | 2021-01-05 | 南京燚霆物联网科技有限公司 | Garage security control alarm system based on Internet of things and control method thereof |
-
2020
- 2020-04-17 CN CN202010306108.9A patent/CN111371418A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186709A (en) * | 2020-08-26 | 2021-01-05 | 南京龙渊众创信息科技股份有限公司 | Anti-static protection system and protection method for communication of Internet of things |
| CN112185037A (en) * | 2020-08-26 | 2021-01-05 | 南京燚霆物联网科技有限公司 | Garage security control alarm system based on Internet of things and control method thereof |
| CN112186709B (en) * | 2020-08-26 | 2023-03-31 | 南京龙渊众创信息科技股份有限公司 | Anti-static protection system and protection method for communication of Internet of things |
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