CN218041759U - Noise elimination circuit and speaker equipment - Google Patents
Noise elimination circuit and speaker equipment Download PDFInfo
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- CN218041759U CN218041759U CN202221696900.0U CN202221696900U CN218041759U CN 218041759 U CN218041759 U CN 218041759U CN 202221696900 U CN202221696900 U CN 202221696900U CN 218041759 U CN218041759 U CN 218041759U
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Abstract
The present disclosure relates to a noise canceling circuit and a speaker device, the noise canceling circuit including: the device comprises an audio power amplifier circuit, a noise extraction circuit, an inverter circuit and a loudspeaker; the output end of the audio power amplification circuit is electrically connected with the input end of the loudspeaker; the output end of the loudspeaker is electrically connected with the input end of the noise extraction circuit; the output end of the noise extraction circuit is electrically connected with the input end of the inverter circuit; the output end of the inverter circuit is electrically connected with the first input end of the audio power amplifier circuit; the second input end of the audio power amplifier circuit is used for receiving audio signals. The loudspeaker can eliminate or weaken the current sound interference problem of the loudspeaker, so that a user can clearly hear sound, and the user experience is improved.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a noise cancellation circuit and a speaker device.
Background
At present, audio and video products such as mobile phones and the like are more and more compact in stacking, higher in integration level and more prominent in signal integrity, and especially, the problem that a loudspeaker faces electromagnetic interference is more and more prominent.
The noise generated by the electromagnetic interference includes audio current sound, and the presence of the audio current sound can have a great influence on the user when the user uses the speaker. When a user makes and receives calls, listens to music, and watches movies, the noise may affect the reception and output of normal sounds, resulting in a reduction in the user experience, and even affect the normal use of the electronic device.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a noise cancellation circuit and a speaker device, which can cancel or reduce the current noise interference problem of a speaker itself, so that a user can clearly hear a sound, and user experience is improved.
In a first aspect, the present disclosure provides a noise cancellation circuit, including:
the device comprises an audio power amplifier circuit, a noise extraction circuit, an inverter circuit and a loudspeaker;
the output end of the audio power amplifier circuit is electrically connected with the input end of the loudspeaker; the output end of the loudspeaker is electrically connected with the input end of the noise extraction circuit; the output end of the noise extraction circuit is electrically connected with the input end of the inverter circuit; the output end of the inverter circuit is electrically connected with the first input end of the audio power amplifier circuit; the second input end of the audio power amplifier circuit is used for receiving an audio signal;
the noise extraction circuit is used for extracting interference signals generated by the loudspeaker; the phase inverting circuit is used for generating an inverted signal with the phase opposite to that of the interference signal; the audio power amplification circuit is used for mixing the audio signal with the inverted signal to generate and output an audio mixing signal; the loudspeaker is used for receiving the mixed sound signal and playing the mixed sound signal.
In some embodiments, the inverting circuit includes an inverting unit and a weighting unit;
the inversion unit is electrically connected with the weighting unit; the weighting unit is used for determining a gain value according to the interference signal generated by the loudspeaker and the interference signal corresponding to the inverted signal generated by the inverting unit; the inverting unit is used for generating an inverted signal according to the gain value and the interference signal extracted by the noise extraction circuit.
In some embodiments, the weighting unit comprises a first resistance and a second resistance;
the first end of the first resistor is electrically connected with the output end of the noise extraction circuit; the second end of the first resistor is electrically connected with the first end of the second resistor; the first end of the second resistor is electrically connected with the input end of the reversing unit; and the second end of the second resistor is electrically connected with the output end of the reversing unit.
In some embodiments, the noise extraction circuit comprises: an active band pass filter;
the input end of the active band-pass filter is electrically connected with the output end of the loudspeaker; and the output end of the active band-pass filter is electrically connected with the input end of the inverter circuit.
In some embodiments, the active band pass filter comprises: the circuit comprises a first filter, a second filter, a first operational amplifier, a third resistor, a fourth resistor and a current-limiting resistor;
the input end of the first filter is electrically connected with the output end of the loudspeaker; the output end of the first filter is electrically connected with the input end of the second filter; the output end of the first filter is electrically connected with the first end of the third resistor, and the second end of the third resistor is electrically connected with the output end of the first operational amplifier; the output end of the second filter is electrically connected with the positive phase input end of the first operational amplifier; the inverting input end of the first operational amplifier is electrically connected with the first end of a fourth resistor, and the second end of the fourth resistor is electrically connected with the output end of the first operational amplifier; and the inverting output end of the first operational amplifier is grounded through a current-limiting resistor.
In some embodiments, the active band pass filter decimates the frequency range from 200Hz to 217Hz.
In some embodiments, the inverter circuit comprises: a second operational amplifier;
the inverting input end of the second operational amplifier is electrically connected with the input end of the inverting circuit; the non-inverting input end of the second operational amplifier is grounded; the output end of the second operational amplifier is electrically connected with the output end of the inverting circuit.
In some embodiments, the audio power amplifier module is integrated with the audio power amplifier circuit, the noise extraction circuit and the inverter circuit.
In some embodiments, the audio power amplifier module is integrated with the audio power amplifier circuit;
the noise elimination module is integrated with the noise extraction circuit and the phase inversion circuit;
the output end of the audio power amplification module is electrically connected with the input end of the loudspeaker; the output end of the loudspeaker is electrically connected with the input end of the noise elimination module; the output end of the noise elimination module is electrically connected with the first input end of the audio power amplifier circuit.
In a second aspect, the present disclosure also provides a speaker device, including the noise cancellation circuit described in any embodiment of the first aspect.
The output end of the audio power amplification circuit is electrically connected with the input end of the loudspeaker; the output end of the loudspeaker is electrically connected with the input end of the noise extraction circuit; the output end of the noise extraction circuit is electrically connected with the input end of the inverter circuit; the output end of the inverter circuit is electrically connected with the first input end of the audio power amplification circuit; the second input end of the audio power amplifier circuit is used for receiving audio signals. The loudspeaker can produce the current sound under electromagnetic action, and the current sound disturbs the audio signal of receiving, sends the sound of nourishing, causes the interference to the audio signal of broadcast, and noise extraction circuit directly extracts interfering signal, and inverter circuit generates the inverted signal to interfering signal, can the noise elimination after inverted signal and interfering signal mix, with the inverted signal input audio power amplifier circuit in, transmit to the loudspeaker to reach the effect of eliminating interfering signal. The method and the device can eliminate or weaken the current sound interference problem of the loudspeaker, so that a user can clearly hear the sound, and the user experience is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a noise cancellation circuit according to an embodiment of the disclosure;
fig. 2 is a schematic circuit diagram of an inverter circuit according to an embodiment of the disclosure;
fig. 3 is a circuit schematic diagram of a noise extraction circuit according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The present disclosure provides a noise cancellation circuit, and fig. 1 is a schematic structural diagram of a noise cancellation circuit provided in an embodiment of the present disclosure, as shown in fig. 1, the noise cancellation circuit includes: audio power amplifier circuit 10, noise extraction circuit 20, inverter circuit 30 and speaker 40.
The output end of the audio power amplifier circuit 10 is electrically connected with the input end of the loudspeaker 40, the output end of the loudspeaker 40 is electrically connected with the input end of the noise extraction circuit 20, the output end of the noise extraction circuit 20 is electrically connected with the input end of the inverter circuit 30, the output end of the inverter circuit 30 is electrically connected with the first input end of the audio power amplifier circuit 10, and the second input end of the audio power amplifier circuit 10 is used for receiving audio signals.
The noise extraction circuit 20 is used for extracting an interference signal generated by the loudspeaker 40, the phase inversion circuit 30 is used for generating an inverted signal with a phase opposite to that of the interference signal, the audio power amplification circuit 10 is used for mixing the audio signal with the inverted signal to generate a mixed sound signal output, and the loudspeaker 40 is used for receiving the mixed sound signal and playing the mixed sound signal.
Specifically, an audio signal is input into the audio power amplifier circuit 10 from the second input end of the audio power amplifier circuit 10, the output end of the audio power amplifier circuit 10 is electrically connected to the input end of the speaker 40, the audio power amplifier circuit 10 outputs the audio signal to the speaker 40, and after the output signal is transmitted to the speaker 40, current sound is generated under electromagnetic interference to generate an interference signal, the output audio signal has different voltage variation amplitude under the action of the interference signal, and the variation of the audio signal can be obtained through the voltage variation amplitude. The output terminal of the speaker 40 is electrically connected to the input terminal of the noise extraction circuit 20, and the noise extraction circuit 20 can obtain the voltage waveform diagram in real time, analyze the voltage waveform diagram, for example, perform a spectrum analysis, and obtain the voltage waveform diagram of the current sound generated by the interference, that is, obtain the waveform diagram of the interference signal. The output terminal of the noise extraction circuit 20 is electrically connected to the input terminal of the inverter circuit 30, the inverter circuit 30 generates an inverted signal having the same frequency, the same amplitude, and the opposite phase as the interference signal according to the waveform pattern of the interference signal, and the inverted signal and the interference signal are superimposed and can cancel each other. The output end of the phase inverting circuit 30 is electrically connected to the first input end of the audio power amplifying circuit 10, so that the phase inverting signal is input into the audio power amplifying circuit 10 from the first input end, the audio power amplifying circuit 10 mixes and superimposes the audio signal input from the second input end and the phase inverting signal, and outputs the mixed signal to the speaker 40 together, the phase inverting signal is offset from the interfering signal in the speaker 40, and the speaker 40 plays the received audio signal, thereby eliminating or weakening the current sound interference problem of the speaker itself. It should be noted that, in the following description,
according to the noise elimination circuit provided by the disclosure, the output end of the audio power amplification circuit is electrically connected with the input end of the loudspeaker; the output end of the loudspeaker is electrically connected with the input end of the noise extraction circuit; the output end of the noise extraction circuit is electrically connected with the input end of the inverter circuit; the output end of the inverter circuit is electrically connected with the first input end of the audio power amplification circuit; the second input end of the audio power amplification circuit is used for receiving audio signals. The loudspeaker can produce the current sound under electromagnetic action, and the current sound disturbs the audio signal of receiving, sends the sound of nourishing, causes the interference to the audio signal of broadcast, and the direct extraction interference signal of noise extraction circuit, inverter circuit generate the inverted signal to interference signal, and the noise can be eliminated after inverted signal and interference signal mix, with the inverted signal input audio power amplifier circuit, transmit to the loudspeaker to reach the effect of eliminating interference signal. The method and the device can eliminate or weaken the current sound interference problem of the loudspeaker, so that a user can clearly hear the sound, and the user experience is improved.
In some embodiments, the inverting circuit includes an inverting unit and a weighting unit.
The weighting unit is used for determining a gain value according to the interference signal generated by the current loudspeaker and the interference signal corresponding to the inverted signal generated by the inverting unit, and the inverting unit is used for generating the inverted signal according to the gain value and the interference signal extracted by the noise extraction circuit.
Specifically, the inverting circuit comprises an inverting unit and a weighting unit, and the weighting unit can adjust the amplitude of the inverted signal, so that the interference signal can be eliminated more accurately. When the weighting unit adjusts the amplitude of the inverse signal, it is necessary to obtain the interference signal generated by the speaker at the current time, that is, the interference signal that needs to be eliminated at the current time, and the interference signal corresponding to the inverse signal generated by the inverting unit, where a time node at which the interference signal corresponding to the inverse signal generated by the inverting unit appears may be different from a time node corresponding to the interference signal generated by the speaker at the current time and may not be at the same time node. When the time nodes of two interference signals are different, the noise amplitude may be different, so the amplitude of the inverted signal needs to be adjusted, and the adjusted gain value is obtained according to the ratio of the two interference signals. The inverting unit generates an inverted signal according to the obtained gain value and the interference signal extracted by the noise extraction circuit. Taking a mobile phone as an example, the noise magnitude is related to the transmission power of the radio frequency power amplifier, and is not all time, the amplitude and the occurrence time are random, for example, the positions of holding the mobile phone are different, or signals from a normal environment to an elevator room, a staircase and the like are weakened, the noise becomes large, the interference signal is in dynamic change, and the mode of adjusting the amplitude of the phase-reversed signal is adopted, so that the interference signal is more effectively eliminated.
In some embodiments, fig. 2 is a schematic circuit diagram of an inverter circuit provided in the embodiments of the present disclosure, and as shown in fig. 2, the weighting unit includes a first resistor 31 and a second resistor 32.
A first terminal of the first resistor 31 is electrically connected to the output terminal of the noise extraction circuit 20, a second terminal of the first resistor 31 is electrically connected to a first terminal of the second resistor 32, a first terminal of the second resistor 32 is electrically connected to the input terminal of the inversion unit 33, and a second terminal of the second resistor 32 is electrically connected to the output terminal of the inversion unit 33.
Specifically, the weighting unit includes a first resistor 31, the first resistor 31 is an adjustable resistor capable of adjusting its resistance, and the second resistor 32 is a fixed resistor. A first end of the first resistor 31 is electrically connected to an output end of the noise extraction circuit 20, and the extracted interference signal passes through the first resistor 31. The first end of the second resistor 32 is electrically connected to the input end of the inverting unit 33, the second end of the second resistor 32 is electrically connected to the output end of the inverting unit 33, the gain value is the ratio of the second resistor 32 to the first resistor 31, and the gain value can be adjusted by adjusting the second resistor 32. Therefore, after determining the gain value of the weighting unit, the second resistor 32 may be adjusted so that the inverted signal output by the inverting circuit 30 through the inverting unit 33 and the interference signal generated by the current speaker have the same amplitude and cancel each other, thereby eliminating the interference signal.
It should be noted that the circuit provided in the embodiment of the present disclosure further includes other electronic components, such as a resistor, a capacitor, a power supply, and the like, which are not shown in detail in the embodiment of the present disclosure, and the circuit is set according to actual requirements, and the present disclosure does not limit the circuit. The circuit also includes other connection means, and this embodiment is only for illustration.
In some embodiments, the noise extraction circuit comprises: an active band pass filter.
The input end of the active band-pass filter is electrically connected with the output end of the loudspeaker, and the output end of the active band-pass filter is electrically connected with the input end of the inverter circuit.
In particular, an active band-pass filter allows only signals in a certain frequency range to pass through, its frequency range being between f1 and f2, which allows frequency components higher than f1 and lower than f2 in the signal to pass through without attenuation, while other components are attenuated. The input of the active band-pass filter is electrically connected to the output of the loudspeaker, and the active filter allows only signals in its frequency range, such as signals in the low frequency range, to pass through to extract low frequency noise signals. The output end of the active band-pass filter is electrically connected with the input end of the inverter circuit, and the noise signal is input into the inverter circuit for processing. Taking a mobile phone as an example, the interference source of the speaker on the current mobile phone mainly includes: switching cycle interference of the WIFI network; 217Hz of GSM narrowband TDMA networks and harmonic interference thereof; 200Hz of a 4G high-definition voice network and harmonic interference thereof; 200Hz and harmonic interference of a 5G new air interface network. Since the noise frequency is concentrated and mainly low, the frequency range may be set to a low frequency range.
It should be noted that, in the present disclosure, the selection of the filter is not limited, and the filter may be different types of filters such as an active band-pass filter, a passive band-pass filter, a low-pass filter, a high-pass filter, and a band-stop filter, and the type of the filter is determined according to the frequency range of the noise signal that needs to be obtained actually.
In some embodiments, fig. 3 is a circuit schematic diagram of a noise extraction circuit provided in an embodiment of the present disclosure, and as shown in fig. 3, the active band-pass filter 21 includes: a first filter 22, a second filter 23, a first operational amplifier 24, a third resistor 25, a fourth resistor 26, and a current limiting resistor 27.
An input of the first filter 22 is electrically connected to an output of the loudspeaker 40 and an output of the first filter 22 is electrically connected to an input of the second filter 23. The output of the first filter 22 is electrically connected to a first terminal of a third resistor 25, and a second terminal of the third resistor 25 is electrically connected to the output of the first operational amplifier 24. The output terminal of the second filter 23 is electrically connected to the non-inverting input terminal of the first operational amplifier 24. The inverting input of the first operational amplifier 24 is electrically connected to a first terminal of a fourth resistor 26, and a second terminal of the fourth resistor 26 is electrically connected to the output of the first operational amplifier 24. The inverting output of the first operational amplifier 24 is connected to ground through a current limiting resistor 27.
The speaker 40 acquires a signal, and the active band-pass filter 21 is a second-order active band-pass filter including a first filter 22, a second filter 23, a first operational amplifier 24, and a plurality of resistors. The first filter 22 is composed of a capacitor and a resistor, and performs first filtering on the signal input by the speaker 40, and the second filter 23 is composed of a capacitor and a resistor, and performs second filtering on the signal output by the first filter 22, so that the multi-stage filtering can extract the signal more accurately, and filter the signal which is not qualified. The existence of the first operational amplifier 24, the third resistor 25 and the fourth resistor 26 can adjust the waveform, for example, amplify a weak signal, and the inverting output terminal of the first operational amplifier 24 is grounded through the current limiting resistor 27, so as to play a role in current limiting and avoid circuit damage.
In some embodiments, the active band pass filter decimates the frequency range from 200Hz to 217Hz.
The loudspeaker interference source mainly comprises: switching cycle interference of the WIFI network; 217Hz of GSM narrowband TDMA networks and harmonic interference thereof; 200Hz of a 4G high-definition voice network and harmonic interference thereof; 200Hz and harmonic interference of a 5G new air interface network. The noise frequency is more concentrated, mainly low frequency, the interference intensity and power are more large, mainly 2G 217Hz and 5G200Hz, and the influence on the loudspeaker is larger, therefore, the frequency range is set in the range, namely, the extraction frequency range of the active band-pass filter is 200 Hz-217 Hz.
It should be noted that, in the present disclosure, the extraction frequency range is not limited, and the extraction frequency range is set according to the actual frequency range of the interference signal, and the interference signal may be extracted.
In some embodiments, an inverter circuit comprises: the inverting input end of the second operational amplifier is electrically connected with the input end of the inverting circuit; the non-inverting input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is electrically connected with the output end of the inverting circuit.
The inverting input end of the second operational amplifier is electrically connected with the input end of the inverting circuit and receives the interference signal input by the input end of the inverting circuit, the second operational amplifier inverts the interference signal to obtain an inverted signal and outputs the inverted signal by the output end of the second operational amplifier, the output end of the second operational amplifier is electrically connected with the output end of the inverting circuit, and furthermore, the inverted signal is output by the output end of the inverting circuit to eliminate the interference signal generated by the loudspeaker.
In some embodiments, the audio power amplifier module is integrated with an audio power amplifier circuit, a noise extraction circuit and an inverter circuit. The audio power amplifier circuit, the noise extraction circuit and the inverter circuit are integrated in the same module, the integrated audio power amplifier module is easier to control, the control difficulty is reduced, the simplified structure is facilitated, and the module integration is improved. The audio power amplifier module is used for eliminating or weakening the current sound interference problem of the loudspeaker, so that a user can clearly hear sound, and the user experience is improved.
In some embodiments, the audio power amplifier module is integrated with an audio power amplifier circuit. The noise elimination module is integrated with a noise extraction circuit and an inverting circuit. The output end of the audio power amplifier module is electrically connected with the input end of the loudspeaker, the output end of the loudspeaker is electrically connected with the input end of the noise elimination module, and the output end of the noise elimination module is electrically connected with the first input end of the audio power amplifier circuit.
Audio power amplifier module output audio signal, output through audio power amplifier module transmits to the speaker, the speaker transmits audio signal and its interfering signal who produces to noise elimination module, in noise elimination module, extract interfering signal and generate the inverted signal, output via noise elimination module's output at last, transmit to audio power amplifier circuit's first input, the inverted signal transmits to the speaker via audio power amplifier circuit, with the interfering signal of speaker offset each other, eliminate interfering signal. The circuit is integrated into two modules according to functions, the two modules are controlled respectively, the circuit is more orderly, and after the circuit is modularized, the circuit is favorable for the combined use of each module, and the utilization rate is improved.
It should be noted that, in the embodiment of the present disclosure, a combination manner of the above-mentioned circuit integration is not limited, and the circuit integration may be combined into a plurality of modules, which are set according to actual requirements.
The present disclosure also provides a speaker device including the noise cancellation circuit described in any of the above embodiments. The loudspeaker device can also be applied to various electronic devices, such as mobile phones, computers, earphones and the like, and sounds are emitted through the loudspeaker device. The loudspeaker can eliminate or weaken the current sound interference problem of the loudspeaker, so that a user can clearly hear sound, and the user experience is improved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A noise cancellation circuit, comprising:
the device comprises an audio power amplifier circuit, a noise extraction circuit, an inverter circuit and a loudspeaker;
the output end of the audio power amplifier circuit is electrically connected with the input end of the loudspeaker; the output end of the loudspeaker is electrically connected with the input end of the noise extraction circuit; the output end of the noise extraction circuit is electrically connected with the input end of the inverter circuit; the output end of the inverter circuit is electrically connected with the first input end of the audio power amplifier circuit; the second input end of the audio power amplification circuit is used for receiving audio signals;
the noise extraction circuit is used for extracting interference signals generated by the loudspeaker; the phase inverting circuit is used for generating an inverted signal with the phase opposite to that of the interference signal; the audio power amplifier circuit is used for mixing the audio signal with the inverted signal to generate a mixed sound signal and outputting the mixed sound signal; the loudspeaker is used for receiving and playing the mixed sound signal.
2. The noise cancellation circuit according to claim 1, wherein the inverting circuit includes an inverting unit and a weighting unit;
the inversion unit is electrically connected with the weighting unit; the weighting unit is used for determining a gain value according to the interference signal generated by the loudspeaker and the interference signal corresponding to the inverted signal generated by the inverting unit; the inverting unit is used for generating an inverted signal according to the gain value and the interference signal extracted by the noise extraction circuit.
3. The noise cancellation circuit according to claim 2, wherein the weighting unit includes a first resistor and a second resistor;
the first end of the first resistor is electrically connected with the output end of the noise extraction circuit; the second end of the first resistor is electrically connected with the first end of the second resistor; the first end of the second resistor is electrically connected with the input end of the reversing unit; and the second end of the second resistor is electrically connected with the output end of the reversing unit.
4. The noise cancellation circuit of claim 1, wherein the noise extraction circuit comprises: an active band-pass filter;
the input end of the active band-pass filter is electrically connected with the output end of the loudspeaker; and the output end of the active band-pass filter is electrically connected with the input end of the inverter circuit.
5. The noise cancellation circuit of claim 4, wherein the active band pass filter comprises: the circuit comprises a first filter, a second filter, a first operational amplifier, a third resistor, a fourth resistor and a current-limiting resistor;
the input end of the first filter is electrically connected with the output end of the loudspeaker; the output end of the first filter is electrically connected with the input end of the second filter; the output end of the first filter is electrically connected with the first end of the third resistor, and the second end of the third resistor is electrically connected with the output end of the first operational amplifier; the output end of the second filter is electrically connected with the positive phase input end of the first operational amplifier; the inverting input end of the first operational amplifier is electrically connected with the first end of a fourth resistor, and the second end of the fourth resistor is electrically connected with the output end of the first operational amplifier; and the inverted output end of the first operational amplifier is grounded through a current-limiting resistor.
6. The noise cancellation circuit of claim 4, wherein the active band pass filter decimates a frequency range of 200Hz to 217Hz.
7. The noise cancellation circuit according to claim 1, wherein the inverting circuit includes: a second operational amplifier;
the inverting input end of the second operational amplifier is electrically connected with the input end of the inverting circuit; the non-inverting input end of the second operational amplifier is grounded; and the output end of the second operational amplifier is electrically connected with the output end of the inverting circuit.
8. The noise cancellation circuit of claim 1, wherein an audio power amplifier module is integrated with the audio power amplifier circuit, the noise extraction circuit, and the inverter circuit.
9. An acoustic speaker apparatus comprising the noise canceling circuit according to any one of claims 1 to 8.
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| CN202221696900.0U CN218041759U (en) | 2022-07-01 | 2022-07-01 | Noise elimination circuit and speaker equipment |
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| CN202221696900.0U CN218041759U (en) | 2022-07-01 | 2022-07-01 | Noise elimination circuit and speaker equipment |
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