CN113423042A - Noise reduction system and noise data processing method - Google Patents
Noise reduction system and noise data processing method Download PDFInfo
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- CN113423042A CN113423042A CN202110680219.0A CN202110680219A CN113423042A CN 113423042 A CN113423042 A CN 113423042A CN 202110680219 A CN202110680219 A CN 202110680219A CN 113423042 A CN113423042 A CN 113423042A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
Abstract
The invention discloses a noise reduction system and a noise data processing method. Wherein, this system includes: the system comprises a multi-channel noise acquisition circuit, a noise amplification circuit, a monitoring circuit, a Digital Signal Processing (DSP) controller and an analog-to-digital conversion circuit, wherein the multi-channel noise acquisition circuit is connected with the noise amplification circuit, and the noise amplification circuit is connected with the DSP controller through the analog-to-digital conversion circuit; the noise amplification circuit and the DSP controller are both connected with the monitoring circuit, and the monitoring circuit is used for monitoring the power consumption of the noise amplification circuit and the control instruction of the DSP controller; the monitoring circuit is connected with the multi-channel noise acquisition circuit and is used for controlling the multi-channel noise acquisition circuit. The invention solves the technical problems that the noise reduction system in the related art can not conveniently and effectively control the running state of a circuit for multi-channel noise acquisition, and an unused noise acquisition channel can increase the power consumption of a noise amplification circuit, thereby influencing the stable running and reducing the stability of the system.
Description
Technical Field
The invention relates to the field of noise reduction control, in particular to a noise reduction system and a noise data processing method.
Background
At present, the state of multichannel noise acquisition circuit among the active noise reduction system can't make things convenient for effectual control, and there is the influence in the state of this circuit to the stability of noise amplification circuit operation, be in stable state for making the active noise reduction system all the time, need detect and control the state of noise acquisition circuit, and then stable noise amplification circuit, the shutoff of input is realized through manual switch to most of control circuit, it is big to occupy pcb layout area, the reliability is relatively poor and the operation is more troublesome, especially to the circuit that the channel number is more.
Patent CN100590974C discloses a detection control circuit, which is connected to a series circuit formed by a power supply line and a propulsion line, and is used for controlling to turn off the series circuit when detecting that no current exists in the series circuit. The control circuit is complex and cannot be turned off from software.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a noise reduction system and a noise data processing method, which at least solve the technical problems that the operation state of a circuit for multi-channel noise acquisition cannot be conveniently and effectively controlled by the noise reduction system in the related technology, and the unused noise acquisition channel can increase the power consumption of a noise amplification circuit, influence the stable operation and reduce the stability of the system.
According to an aspect of an embodiment of the present invention, there is provided a noise reduction system including: the system comprises a multi-channel noise acquisition circuit, a noise amplification circuit, a monitoring circuit, a Digital Signal Processing (DSP) controller and an analog-to-digital conversion circuit, wherein the multi-channel noise acquisition circuit is connected with the noise amplification circuit, and the noise amplification circuit is connected with the DSP controller through the analog-to-digital conversion circuit; the noise amplification circuit and the DSP controller are both connected with the monitoring circuit, and the monitoring circuit is used for monitoring the power consumption of the noise amplification circuit and a control instruction of the DSP controller; the monitoring circuit is connected with the multi-channel noise acquisition circuit and is used for controlling the multi-channel noise acquisition circuit.
Optionally, the monitoring circuit includes: a switching device, a first control circuit and a second control circuit; the first control circuit is connected with the switching device and the noise amplification circuit, and the second control circuit is connected with the switching device and the DSP controller; the first control circuit comprises a voltage comparator, wherein the input end of the voltage comparator is connected with the output end of the noise amplification circuit and the input end of the reference voltage of the noise amplification circuit, and the input end of the reference voltage of the noise amplification circuit is used for comparing the output voltage of the noise amplification circuit with the reference voltage.
Optionally, the first control circuit further includes: the transient suppression TVS comprises a transient suppression TVS diode, a first resistor, a second resistor and a third resistor, wherein two ends of the first resistor are respectively connected with the input end of the voltage comparator and the output end of the noise amplification circuit; two ends of the second resistor are respectively connected with the input end of the voltage comparator and the reference voltage input end of the noise amplification circuit; two ends of the third resistor are respectively connected with the output end of the voltage comparator and the input end of the switching device; one end of the TVS diode is connected with the input end of the switching device, and the other end of the TVS diode is grounded.
Optionally, the input end of the switching device is provided with a fourth resistor, and the input end of the switching device is further connected with the output end of the DSP controller.
Optionally, the method further includes: the input end of the power amplification circuit is connected with the DSP controller through the digital-to-analog conversion circuit and is used for carrying out power amplification on the signal output by the DSP controller; the output end of the power amplifying circuit is connected with the loudspeaker and used for playing the reverse noise through the loudspeaker.
According to another aspect of the embodiments of the present invention, there is also provided a noise data processing method, applied to the noise reduction system described in any one of the above, including: acquiring the power consumption of the noise amplification circuit through a monitoring circuit; under the condition that the power consumption is determined to be larger than a preset power consumption threshold value of the noise amplification circuit through a voltage comparator, closing corresponding noise acquisition channels, wherein the number of the noise acquisition channels is multiple; receiving a control instruction of a DSP controller through a monitoring circuit, wherein the control instruction comprises a noise acquisition channel which is opened and closed; and controlling the plurality of noise acquisition channels through a monitoring circuit according to the control instruction.
Optionally, when it is determined by the voltage comparator that the power consumption is greater than the power consumption threshold preset by the noise amplification circuit, closing the corresponding noise acquisition channel includes: and under the condition that the output voltage of the noise amplification circuit is determined to be greater than the preset reference voltage through the voltage comparator, determining that the power consumption is greater than the preset power consumption threshold value of the noise amplification circuit, outputting a low level through the voltage comparator, and controlling a switching device to be switched off so as to close a corresponding noise acquisition channel.
Optionally, according to the control instruction, controlling the plurality of noise collection channels by the monitoring circuit includes: and according to the control instruction, inputting a low-level control instruction into a switching device of the noise acquisition channel to be closed, controlling the switching device to be switched off so as to close the corresponding noise acquisition channel, inputting a high-level control instruction into the switching device of the noise acquisition channel to be switched on, and controlling the switching device to be switched on so as to switch on the corresponding noise acquisition channel.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program executes to perform the noise data processing method according to any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the noise data processing method according to any one of the above.
In the embodiment of the invention, a multi-channel noise acquisition circuit, a noise amplification circuit, a monitoring circuit, a digital signal processing DSP controller and an analog-to-digital conversion circuit are adopted, wherein the multi-channel noise acquisition circuit is connected with the noise amplification circuit, and the noise amplification circuit is connected with the DSP controller through the analog-to-digital conversion circuit; the noise amplification circuit and the DSP controller are both connected with the monitoring circuit, and the monitoring circuit is used for monitoring the power consumption of the noise amplification circuit and the control instruction of the DSP controller; the monitoring circuit is connected with the multi-channel noise acquisition circuit and is used for controlling the multi-channel noise acquisition circuit, the power consumption of the noise amplifying circuit is monitored by the monitoring circuit, and according to the control signal of the DSP controller, the multi-channel noise acquisition channel is controlled, so that when the noise acquisition channel is controlled according to the power consumption of the noise amplification circuit, according to the purpose that the DSP controller controls a plurality of noise acquisition channels as required, the technical effects of effectively controlling a plurality of noise acquisition channels and improving the stability of the system are realized, and further the noise reduction system in the related technology is solved, the running state of a circuit for collecting the multi-channel noise cannot be conveniently and effectively controlled, and the unused noise collecting channel can increase the power consumption of a noise amplifying circuit, influence the stable running and reduce the stability of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic illustration of a noise reduction system according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method of noise data processing according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a noise reduction system architecture according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a monitoring circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of a noise reduction system according to an embodiment of the present invention, and as shown in fig. 1, according to an aspect of an embodiment of the present invention, there is provided a noise reduction system including: a multi-channel noise acquisition circuit 10, a noise amplification circuit 12, a monitoring circuit 14, a digital signal processing DSP controller 16, an analog-to-digital conversion circuit 18, wherein,
the multi-channel noise acquisition circuit 10 is connected with the noise amplification circuit 12, and the noise amplification circuit 12 is connected with the DSP controller 16 through the analog-to-digital conversion circuit 18; the noise amplifying circuit 12 and the DSP controller 16 are both connected with the monitoring circuit 14, and the monitoring circuit 14 is used for monitoring the power consumption of the noise amplifying circuit 12 and the control instruction of the DSP controller 16; the monitoring circuit 14 is connected to the multi-channel noise collection circuit 10, and is configured to control the multi-channel noise collection circuit 10.
Through the system, a multi-channel noise acquisition circuit, a noise amplification circuit, a monitoring circuit, a digital signal processing DSP controller and an analog-to-digital conversion circuit are adopted, wherein the multi-channel noise acquisition circuit is connected with the noise amplification circuit, and the noise amplification circuit is connected with the DSP controller through the analog-to-digital conversion circuit; the noise amplification circuit and the DSP controller are both connected with the monitoring circuit, and the monitoring circuit is used for monitoring the power consumption of the noise amplification circuit and the control instruction of the DSP controller; the monitoring circuit is connected with the multi-channel noise acquisition circuit and is used for controlling the multi-channel noise acquisition circuit, the power consumption of the noise amplifying circuit is monitored by the monitoring circuit, and according to the control signal of the DSP controller, the multi-channel noise acquisition channel is controlled, so that when the noise acquisition channel is controlled according to the power consumption of the noise amplification circuit, according to the purpose that the DSP controller controls a plurality of noise acquisition channels as required, the technical effects of effectively controlling a plurality of noise acquisition channels and improving the stability of the system are realized, and further the noise reduction system in the related technology is solved, the running state of a circuit for collecting the multi-channel noise cannot be conveniently and effectively controlled, and the unused noise collecting channel can increase the power consumption of a noise amplifying circuit, influence the stable running and reduce the stability of the system.
The multi-channel noise collection circuit 10 is connected to a noise amplification circuit 12, and amplifies the collected noise signals through the noise amplification circuit, and the multi-channel noise collection circuit is also a circuit in which a plurality of noise collection channels collect noise in parallel. The noise amplifying circuit 12 is connected to the analog-to-digital conversion circuit 18, and converts the collected noise signal from analog quantity to digital quantity, thereby facilitating the recognition and operation of the controller. The noise amplifying circuit is also used for determining a reverse noise signal of the noise signal, then transmitting the reverse noise signal to the DSP controller through the digital-to-analog conversion circuit 18, the analog-to-digital conversion circuit 18 converts the reverse noise signal of the analog quantity into a digital quantity and transmits the digital quantity to the DSP controller, the DSP controller performs identification and operation to determine a characteristic parameter of the reverse noise signal, specifically performs digital filtering and noise amplitude adjustment, namely calculates the characteristic parameter of the noise, transmits the reverse noise to the digital-to-analog conversion circuit in the form of the digital quantity, and converts the reverse noise signal in the form of the digital quantity into the reverse noise signal of the analog quantity, so that the reverse noise signal acts on the noise to achieve the purpose of reducing the noise.
In one embodiment, the DSP signal is connected to a power amplifier through a digital-to-analog conversion circuit, and amplifies power of an analog reverse noise, and then plays the reverse noise through a speaker to interact with noise in the environment, thereby achieving the purpose of reducing noise.
The noise amplifying circuit is connected with the monitoring circuit, the monitoring circuit monitors the power consumption of the noise amplifying circuit to determine whether the power consumption exceeds a preset power consumption threshold value, and under the condition that the power consumption of the amplifying circuit exceeds the preset power consumption threshold value, the power consumption of the noise amplifying circuit is over high, a corresponding noise acquisition channel needs to be closed, and then the corresponding noise channel is controlled to be closed.
The above determining whether the power consumption of the noise amplifying circuit exceeds the preset power consumption threshold may adopt various manners, specifically, since the power consumption is related to the output voltage and the output current, it may be determined whether the power consumption of the noise amplifying circuit exceeds the preset power consumption threshold by detecting whether the output current reaches the preset output current, it may also be determined whether the power consumption of the noise amplifying circuit exceeds the preset power consumption threshold by setting a reference voltage of the preset power consumption threshold, comparing the output voltage with the reference voltage by using a comparator, determining the magnitude of the output voltage and the reference voltage according to whether an output signal of the comparator is a high level or a low level, and further determining whether the power consumption exceeds the preset power consumption threshold.
The DSP controller is connected with the monitoring circuit, the monitoring circuit is directly controlled by the DSP controller to close the noise collection channel to be closed, and the noise collection channel to be opened is opened. The DSP controller can also be connected with a user interaction device, receives a user instruction through the user interaction device, comprises a noise acquisition channel needing to be closed and a noise acquisition channel needing to be opened, and further sends a control signal to control the monitoring circuit through the instruction.
The monitoring circuit is connected with the multi-channel noise acquisition circuit and further connected with the multi-channel noise acquisition channels, and controls the closing and opening of the multi-channel noise acquisition channels.
The noise reduction system monitors the power consumption of the noise amplification circuit through the monitoring circuit, and controls the multiple noise acquisition channels according to the control signal of the DSP controller, thereby achieving the purpose of controlling the multiple noise acquisition channels according to the requirements when controlling the noise acquisition channels according to the power consumption of the noise amplification circuit, thereby realizing the effective control of the multiple noise acquisition channels, improving the technical effect of the stability of the system, further solving the noise reduction system in the related technology, the circuit operation state of the multiple noise acquisition channels can not be conveniently and effectively controlled, the unused noise acquisition channels can increase the power consumption of the noise amplification circuit, the stable operation is influenced, and the technical problem of the stability of the system is reduced.
Optionally, the monitoring circuit includes: a switching device, a first control circuit and a second control circuit; the first control circuit is connected with the switching device and the noise amplification circuit, and the second control circuit is connected with the switching device and the DSP controller; the first control circuit comprises a voltage comparator, wherein the input end of the voltage comparator is connected with the output end of the noise amplification circuit and the input end of the reference voltage of the noise amplification circuit, and the input end of the reference voltage of the noise amplification circuit is used for comparing the output voltage of the noise amplification circuit with the reference voltage.
The switching device is used for controlling the opening and closing of the multiple noise acquisition channels, and it should be noted that the switching device may be one, and is connected with the multiple noise acquisition channels, and the electronic switches of different noise acquisition channels send electric signals to control the opening and closing of different noise acquisition channels. The switching devices can be multiple, the multiple switching devices are respectively connected with the multiple collecting channels, and the corresponding noise collecting channels are directly controlled to be opened and closed through the on-off of current.
Under the condition that a plurality of switch devices are arranged, the noise acquisition channel is controlled to be opened and closed through current on-off, the switch devices can adopt triodes or diodes, and the current on-off is realized through the on-off of the triodes or the diodes. Preferably, the switching device may be a PNP transistor.
The first control circuit is connected with the switching device and the noise amplification circuit, and controls the switching device according to the power consumption of the noise amplification circuit so as to control the multiple noise acquisition channels. Specifically, the first control circuit includes a voltage comparator, an input terminal of the voltage comparator is connected to an output terminal of the noise amplification circuit, and an input terminal of a reference voltage of the noise amplification circuit, and compares an output voltage of the noise amplification circuit with the reference voltage.
Specifically, when the output voltage of the noise amplification circuit is greater than the reference voltage, it is indicated that the power consumption is greater than the preset power consumption threshold, the voltage comparator outputs a low level, and the low level is input to the switching device, so that the switching device is turned on, and the corresponding noise collection channel is turned off. And under the condition that the output voltage of the noise amplification circuit is smaller than the reference voltage, the power consumption is smaller than a preset power consumption threshold value, the voltage comparator outputs a high level, and the high level is input into the switching device, so that the switching device is cut off, and a corresponding noise acquisition channel is opened.
The second control circuit is connected with the switch device and the DSP controller, and controls the switch device according to the instruction of the DSP controller so as to control the multi-channel noise acquisition channel. The first control circuit and the second control circuit are independent two control circuits which are connected with the same switch device, so that the circuit structure can be effectively simplified, and the situation of circuit redundancy caused by the fact that the switch devices are arranged on the first control circuit and the second control circuit respectively is avoided.
Optionally, the first control circuit further includes: the transient suppression TVS device comprises a transient suppression TVS diode, a first resistor, a second resistor and a third resistor, wherein two ends of the first resistor are respectively connected with the input end of a voltage comparator and the output end of a noise amplification circuit; two ends of the second resistor are respectively connected with the input end of the voltage comparator and the reference voltage input end of the noise amplification circuit; two ends of the third resistor are respectively connected with the output end of the voltage comparator and the input end of the switching device; one end of the TVS diode is connected with the input end of the switching device, and the other end of the TVS diode is grounded.
The two ends of the first resistor are respectively connected with the input end of the voltage comparator and the output end of the noise amplification circuit, and the first resistor is used for providing stable voltage for the voltage comparator, converting the output current of the noise amplification circuit in the circuit into output voltage and inputting the output voltage into the comparator. And two ends of the second resistor are respectively connected with the input end of the voltage comparator and the reference voltage input end of the noise amplification circuit, and the current of the power supply for providing the reference voltage is converted into the reference voltage to be input into the voltage comparator.
And two ends of the third resistor are respectively connected with the output end of the voltage comparator and the input end of the switching device so as to convert the high-voltage current or the low-voltage current output by the voltage comparator into voltage and input the voltage into the switching device, so that the switching device is controlled.
One end of the TVS diode is connected with the input end of the switching device, and the other end of the TVS diode is grounded, so that the voltage between the voltage comparator and the switching device is protected to be stable, and the damage of circuit components caused by the voltage fluctuation of the circuit is avoided.
Optionally, the input end of the switching device is provided with a fourth resistor, and the input end of the switching device is further connected with the output end of the DSP controller.
And two ends of the fourth resistor are connected with the input end of the switch device and the output end of the DSP controller, and are used for converting the control current sent by the DSP controller into voltage and inputting the voltage into the switch device so as to control the switch device according to the DSP controller.
Optionally, the method further includes: the input end of the power amplifying circuit is connected with the DSP controller through the digital-to-analog conversion circuit and is used for amplifying the power of the signal output by the DSP controller; the output end of the power amplifying circuit is connected with the loudspeaker and is used for playing the reverse noise through the loudspeaker.
The DSP signal is connected with a power amplifier through a digital-to-analog conversion circuit, power amplification is carried out on the reverse noise of the analog quantity, and then the reverse noise is played through a loudspeaker to interact with the noise in the environment, so that the purpose of reducing the noise is achieved.
In accordance with an embodiment of the present invention, there is provided a method embodiment of a method of processing noisy data, it being noted that the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer-executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 2 is a flowchart of a method of processing noise data according to an embodiment of the present invention, as shown in fig. 2, the method including the steps of:
step S202, collecting power consumption of a noise amplification circuit through a monitoring circuit;
step S204, under the condition that the power consumption is determined to be larger than a preset power consumption threshold value of the noise amplification circuit through the voltage comparator, closing corresponding noise acquisition channels, wherein the number of the noise acquisition channels is multiple;
step S206, receiving a control instruction of the DSP controller through the monitoring circuit, wherein the control instruction comprises a noise acquisition channel which is opened and closed;
and S208, controlling the plurality of noise acquisition channels through the monitoring circuit according to the control instruction.
Through the steps, the power consumption of the noise amplification circuit is collected through the monitoring circuit; under the condition that the power consumption is determined to be larger than a power consumption threshold value preset by a noise amplifying circuit through a voltage comparator, closing corresponding noise acquisition channels, wherein the number of the noise acquisition channels is multiple; receiving a control instruction of the DSP controller through a monitoring circuit, wherein the control instruction comprises a noise acquisition channel which is opened and closed; according to the control instruction, the mode of controlling the plurality of noise acquisition channels through the monitoring circuit is realized, the power consumption of the noise amplification circuit is monitored through the monitoring circuit, the control signal of the DSP controller is used for controlling the plurality of noise acquisition channels, the aim of controlling the plurality of noise acquisition channels as required according to the DSP controller when the noise acquisition channels are controlled according to the power consumption of the noise amplification circuit is fulfilled, the effective control on the plurality of noise acquisition channels is realized, the technical effect of improving the stability of the system is realized, and further, the noise reduction system in the related technology is solved, the circuit operation state of the multi-channel noise acquisition can not be conveniently and effectively controlled, the unused noise acquisition channels can increase the power consumption of the noise amplification circuit, the stable operation is influenced, and the technical problem of the stability of the system is reduced.
The above-mentioned power consumption of gathering the noise amplification circuit through the monitoring circuit, confirm through the voltage comparator that the power consumption is greater than the noise amplification circuit under the condition of presetting the power consumption threshold, close the corresponding noise acquisition passageway, can adopt multiple mode, it is concrete, because the power consumption is related to output voltage and output current, can confirm whether the power consumption of noise amplification circuit exceeds and predetermines the power consumption threshold through detecting whether output current reaches and predetermines output current, can also confirm whether the power consumption of noise amplification circuit exceeds and predetermines the reference voltage of power consumption threshold through setting up a reference voltage of predetermineeing the power consumption threshold, compare the size of output voltage and reference voltage through the comparator, according to being high level or low level of the output signal of comparator, confirm the size of output voltage and reference voltage, and then confirm whether the power consumption exceeds and predetermine the power consumption threshold.
The DSP controller is connected with the monitoring circuit, the monitoring circuit is directly controlled by the DSP controller to close the noise collection channel to be closed, and the noise collection channel to be opened is opened. The DSP controller can also be connected with a user interaction device, receives a user instruction through the user interaction device, comprises a noise acquisition channel needing to be closed and a noise acquisition channel needing to be opened, and further sends a control signal to control the monitoring circuit through the instruction.
Optionally, when it is determined by the voltage comparator that the power consumption is greater than the power consumption threshold preset by the noise amplification circuit, closing the corresponding noise acquisition channel includes: when the voltage comparator determines that the output voltage of the noise amplification circuit is greater than the preset reference voltage, the power consumption is determined to be greater than the preset power consumption threshold value of the noise amplification circuit, the voltage comparator outputs a low level, the switching device is controlled to be switched on so as to close the corresponding noise acquisition channel, specifically, the switching device is switched on, namely the noise acquisition channel is grounded, so that the effect of closing the corresponding noise acquisition channel is achieved, and the system stability is improved.
Optionally, according to the control instruction, controlling the plurality of noise collection channels by the monitoring circuit includes: according to the control instruction, the control instruction of the low level is input into the switching device of the noise acquisition channel to be closed, the switching device is controlled to be turned off so as to close the corresponding noise acquisition channel, specifically, when the voltage comparator or the DSP controller outputs the low level, the switching device is turned on, namely the noise acquisition channel is grounded, and therefore the effect of closing the noise acquisition channel is achieved. And inputting a high-level control instruction into a switching device of the noise acquisition channel to be started to control the switching device to be switched on, specifically, when the voltage comparator or the DSP controller outputs a high level, the switching device is switched off, and the noise acquisition channel is normally used to start the corresponding noise acquisition channel.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program executes the noise data processing method of any one of the above.
According to another aspect of embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the noise data processing method of any one of the above.
It should be noted that the present application also provides an alternative implementation, and the details of the implementation are described below.
According to the method, the power consumption of the noise amplification circuit is detected and the DSP is directly controlled (or the power consumption and the DSP are separately used) to control the turn-off state of the noise acquisition channel, the circuit is simple and easy to implement, the intelligence of the turn-off of the channel of the noise acquisition circuit is realized, the problem of power consumption increase of the noise amplification circuit caused by the unstable state of the noise acquisition channel is solved, the noise amplification circuit operates stably, and the stability of an active noise reduction system is improved.
The multi-channel noise collection circuit can not be conveniently and effectively controlled in operation state, general manual switch design is too troublesome for multi-channel turn-off control and inconvenient to operate, and the intellectualization of turn-off can not be realized. The unused noise acquisition channel can increase the power consumption of the noise amplification circuit, affect the stable operation of the noise amplification circuit, cause serious heating of the operational amplifier, and reduce the stability of the active noise reduction system.
According to the embodiment, the power consumption data of the noise amplification circuit is detected to judge the turn-off state of the corresponding noise acquisition channel, and the unused channel is grounded in time, so that the power consumption of the noise amplification circuit is reduced, the operation of the noise amplification circuit is stabilized, and the intellectualization of the noise acquisition channel switch is realized. And a DSP software port is added to control the initial states of the 16 noise acquisition channels, so that a user can close and open each channel conveniently according to the actual use condition. The turn-off of the multi-channel noise acquisition can be effectively controlled in hardware and software, the channel turn-off control can be carried out according to the actual requirements of users, simplicity and feasibility are realized, the power consumption of the noise amplification circuit caused by unused noise acquisition channels in the acquisition circuit is reduced, and the stability of the noise amplification circuit and the whole active noise reduction system is improved.
This embodiment provides a novel monitoring circuit, which passively controls the state of the noise collection channels in hardware and actively controls the operating state of each noise collection channel in software.
Fig. 3 is a schematic diagram of a noise reduction system architecture according to an embodiment of the present invention, and as shown in fig. 3, the active noise reduction system includes a 16-channel acquisition circuit, a 16-channel noise amplification circuit, an 8-channel analog-to-digital conversion circuit, a DSP control module, a 4-channel digital-to-analog conversion circuit, a power amplification circuit (inverse noise output circuit), and a monitoring circuit. The monitoring circuit is connected with the noise amplification circuit, the DSP module and the 16-channel acquisition circuit, the monitoring circuit controls the running state of a noise acquisition channel according to control information sent by the DSP and the voltage output by the noise amplification circuit, and the final output of the whole active noise reduction system is only connected with a loudspeaker through the power amplification circuit; the reverse noise signal output by the DA conversion circuit is amplified, and then the amplified reverse noise signal is converted into sound through a loudspeaker, so that the sound is offset with the noise in the environment, and the noise reduction effect is achieved.
Fig. 4 is a schematic diagram of a monitoring circuit according to an embodiment of the present invention, as shown in fig. 4, the monitoring circuit is composed of a switching device PNP transistor Q1, a voltage comparator U1, a TVS transistor D1, and resistors R1, R2, R3, and R4, the control circuit is a passive control method, mainly comparing an output voltage of the noise amplifying circuit with a set threshold voltage Ut through one end of the voltage comparator U1, and if the output voltage of the noise amplifying circuit is greater than an expected designed threshold voltage of the circuit (Ut — R2/R3 Uref where Ut is the threshold voltage and Uref is the reference voltage), the voltage comparator U1 outputs a low level, so as to control the PNP transistor Q1 to be turned on, i.e., control the acquisition channel to be turned off, otherwise, the voltage comparator U1 outputs a high level, and the noise acquisition channel is normally used, and besides, the output state of the voltage comparator U1 can be used to determine the power consumption condition of the noise amplifying circuit, if the voltage comparator U1 outputs a low level, the output voltage of the noise amplification circuit is greater than the threshold voltage Ut, and then the power consumption condition of the amplification circuit is obtained; the power consumption mainly comes from the power consumption of the operational amplifier, and the working temperature condition of the operational amplifier is indirectly obtained (the corresponding temperature can be calculated according to Tj Ta + Ptot Rth, wherein Tj is the node temperature of the operational amplifier, Ta is the environment temperature, Ptot is the total power consumption of the operational amplifier, and Rth is the thermal resistance parameter of the operational amplifier); the second path (active control mode) of the monitoring circuit is composed of a DSP control module, a switching device PNP tube Q1 and a resistor R1, the control circuit mainly controls the turn-off of the PNP tube Q1 through a general input/output port of the DSP module, the level output configuration of the GPIO can be directly carried out on software, the turn-off control of all channels can be carried out in an initial state, if the GPIO outputs high level, the corresponding noise acquisition channel can be normally used, otherwise, when the low level is output, the corresponding signal input channel is grounded, no signal is input, the turn-off effect is achieved, and the control of each noise acquisition channel can also be carried out according to the condition of a user in the use process.
When the method is implemented, if the switching-off of the noise acquisition channel is only controlled, only the second control circuit can be added, and the second control circuit is directly controlled by the DSP, so that the method is convenient and feasible, and the cost can be reduced; under the condition of no cost requirement, suggestions are added, the phenomenon that the stability of a noise amplifying circuit is influenced due to the fact that the running state of each noise acquisition channel is forgotten to be configured on software for personal reasons is avoided, the stability of the whole active noise reduction system is reduced, and the noise reduction effect is influenced.
The PNP transistor Q1 can be replaced by a similar switching device.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A noise reduction system, comprising: a multi-channel noise acquisition circuit, a noise amplification circuit, a monitoring circuit, a digital signal processing DSP controller and an analog-to-digital conversion circuit, wherein,
the multi-channel noise acquisition circuit is connected with the noise amplification circuit, and the noise amplification circuit is connected with the DSP controller through an analog-to-digital conversion circuit;
the noise amplification circuit and the DSP controller are both connected with the monitoring circuit, and the monitoring circuit is used for monitoring the power consumption of the noise amplification circuit and a control instruction of the DSP controller;
the monitoring circuit is connected with the multi-channel noise acquisition circuit and is used for controlling the multi-channel noise acquisition circuit.
2. The noise reduction system of claim 1, wherein the monitoring circuit comprises: a switching device, a first control circuit and a second control circuit;
the first control circuit is connected with the switching device and the noise amplification circuit, and the second control circuit is connected with the switching device and the DSP controller;
the first control circuit comprises a voltage comparator, wherein the input end of the voltage comparator is connected with the output end of the noise amplification circuit and the input end of the reference voltage of the noise amplification circuit, and the input end of the reference voltage of the noise amplification circuit is used for comparing the output voltage of the noise amplification circuit with the reference voltage.
3. The noise reduction system of claim 2, wherein the first control circuit further comprises: a transient suppression TVS diode, a first resistor, a second resistor, a third resistor,
two ends of the first resistor are respectively connected with the input end of the voltage comparator and the output end of the noise amplification circuit;
two ends of the second resistor are respectively connected with the input end of the voltage comparator and the reference voltage input end of the noise amplifier;
two ends of the third resistor are respectively connected with the output end of the voltage comparator and the input end of the switching device;
one end of the TVS diode is connected with the input end of the switching device, and the other end of the TVS diode is grounded.
4. The noise reduction system of claim 3,
and the input end of the switching device is provided with a fourth resistor, and the input end of the switching device is also connected with the output end of the DSP controller.
5. The noise reduction system of claim 1, further comprising: a power amplifying circuit, a digital-to-analog conversion circuit, a speaker,
the input end of the power amplification circuit is connected with the DSP controller through the digital-to-analog conversion circuit and is used for performing power amplification on the signal output by the DSP controller;
the output end of the power amplifying circuit is connected with the loudspeaker and used for playing the reverse noise through the loudspeaker.
6. A method of processing noisy data, comprising:
acquiring the power consumption of the noise amplification circuit through a monitoring circuit;
under the condition that the power consumption is determined to be larger than a preset power consumption threshold value of the noise amplification circuit through a voltage comparator, closing corresponding noise acquisition channels, wherein the number of the noise acquisition channels is multiple;
receiving a control instruction of a DSP controller through a monitoring circuit, wherein the control instruction comprises a noise acquisition channel which is opened and closed;
and controlling the plurality of noise acquisition channels through a monitoring circuit according to the control instruction.
7. The method of claim 6, wherein, in the case that it is determined by the voltage comparator that the power consumption is greater than the power consumption threshold preset by the noise amplification circuit, closing the corresponding noise acquisition channel comprises:
and under the condition that the output voltage of the noise amplification circuit is determined to be greater than the preset reference voltage through the voltage comparator, determining that the power consumption is greater than the preset power consumption threshold value of the noise amplification circuit, outputting a low level through the voltage comparator, and controlling a switching device to be switched off so as to close a corresponding noise acquisition channel.
8. The method of claim 6, wherein controlling, by a monitoring circuit, a plurality of noise collection channels according to the control instructions comprises:
and according to the control instruction, inputting a low-level control instruction into a switching device of the noise acquisition channel to be closed, controlling the switching device to be switched off so as to close the corresponding noise acquisition channel, inputting a high-level control instruction into the switching device of the noise acquisition channel to be switched on, and controlling the switching device to be switched on so as to switch on the corresponding noise acquisition channel.
9. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to perform the method of processing noisy data according to any of claims 6 to 8 when running.
10. A computer-readable storage medium characterized by comprising a stored program, wherein the apparatus in which the computer-readable storage medium is located is controlled to execute the noise data processing method according to any one of claims 6 to 8 when the program is executed.
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