CN116074698A - Environment self-adaptive noise reduction circuit and noise reduction method based on frequency automatic tracking - Google Patents
Environment self-adaptive noise reduction circuit and noise reduction method based on frequency automatic tracking Download PDFInfo
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- CN116074698A CN116074698A CN202310141024.8A CN202310141024A CN116074698A CN 116074698 A CN116074698 A CN 116074698A CN 202310141024 A CN202310141024 A CN 202310141024A CN 116074698 A CN116074698 A CN 116074698A
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- 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
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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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
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Abstract
The invention discloses an environment self-adaptive noise reduction circuit and a noise reduction method based on frequency automatic tracking, wherein the environment self-adaptive noise reduction circuit comprises a signal input circuit, a noise amplification comparison circuit, a frequency equalization circuit, a filter circuit and an audio amplification circuit, wherein the signal input circuit is used for acquiring noise signals and audio signals and preprocessing the noise signals and the audio signals; the noise amplification comparison circuit is used for comparing the voltage difference value of the noise signal and the audio source signal; the frequency equalization circuit is used for tracking the voltage difference value of the noise signal and the audio source signal; the filter circuit is used for limiting the frequency of the output signal of the noise amplification comparison circuit in a certain range and preventing frequency interference; and the audio amplifying circuit is used for carrying out phase conversion on the processed noise signals. By comparing and tracking the voltage difference between the noise signal and the audio source signal, a reverse signal is output to offset external noise, so that the environment self-adaptive noise reduction is ensured in a noisy environment.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an environment self-adaptive noise reduction circuit and a noise reduction method based on frequency automatic tracking.
Background
The automatic noise reduction circuit can effectively isolate external noise, so that music can be heard more clearly, mood can be input more, and especially in a noisy environment, the automatic noise reduction circuit can reduce output volume, so that the effect of protecting hearing is achieved.
According to the user behavior study, if the noise reaches the interference degree, people cannot put into the situation, and when the external noise is large, the situation that the external noise is tolerated to listen to music or the volume of the music is increased generally exists. If the music is intentionally turned up to suppress noise, the sense of the ear may feel uncomfortable when the volume exceeds 85 db.
The automatic noise reduction function is to generate reverse sound waves equal to external noise through a noise reduction system and neutralize the noise, so that the noise reduction effect is realized. The principle is that all sounds consist of a certain frequency spectrum, and if a sound can be found, the frequency spectrum is identical to the noise to be eliminated, and the noise can be completely cancelled out just by reversing the phase.
Disclosure of Invention
The invention aims to provide an environment self-adaptive noise reduction circuit and a noise reduction method based on frequency automatic tracking, which are used for outputting a reverse signal to offset external noise through comparing and tracking the voltage difference value of a noise signal and a sound source signal, so that the environment self-adaptive noise reduction is ensured in a noisy environment.
The invention is realized by the following technical scheme:
the invention provides an environment self-adaptive noise reduction circuit based on frequency automatic tracking, which comprises a signal input circuit, a noise amplification comparison circuit, a frequency equalization circuit, a filter circuit and an audio amplification circuit;
the signal input circuit is used for acquiring a noise signal and a sound source signal and preprocessing the noise signal and the sound source signal;
the noise amplification comparison circuit is used for comparing the voltage difference value of the noise signal and the audio source signal;
the frequency equalization circuit is used for tracking the voltage difference value of the noise signal and the audio source signal;
the filter circuit is used for limiting the frequency of the output signal of the noise amplification comparison circuit in a certain range and preventing frequency interference;
the audio amplifying circuit is used for carrying out phase conversion on the processed noise signals;
the signal input circuit, the noise amplification comparison circuit, the filter circuit and the audio amplification circuit are sequentially connected;
the frequency equalization circuit is connected with the noise amplification comparison circuit in parallel;
the output end of the signal input circuit is connected with the input end of the noise amplification comparison circuit and the input end of the audio amplification circuit.
The invention sequentially connects the signal input circuit, the noise amplification comparison circuit, the filter circuit and the audio amplification circuit, the frequency equalization circuit is connected in parallel with the noise amplification comparison circuit, the output end of the signal input circuit is connected with the input end of the noise amplification comparison circuit and the input end of the audio amplification circuit, and the signal input circuit acquires and pre-processes the noise signal and the audio signal; the noise amplification comparison circuit compares the voltage difference between the noise signal and the audio source signal; the frequency equalization circuit is used for tracking the voltage difference value of the noise signal and the audio source signal; the filter circuit limits the frequency of the output signal of the noise amplification comparison circuit in a certain range to prevent frequency interference; the audio amplifying circuit is used for carrying out phase conversion on the processed noise signals and outputting the processed noise signals, and outputting reverse signals to offset external noise through comparing and tracking the voltage difference values of the noise signals and the audio source signals, so that the environment self-adaptive noise reduction is carried out in a noisy environment.
Further, the signal input circuit comprises a first signal processing circuit and a second signal processing circuit;
the first signal processing circuit includes a noise input and a first voltage divider, the first voltage divider including: the resistor R10, the capacitor C3 and the resistor R1A are sequentially connected, and the noise input end is connected with the resistor R10;
the second signal processing circuit includes: the audio input end, the second voltage divider, the first band-pass filter circuit and the second band-pass filter circuit are connected in sequence.
Further, the second voltage divider comprises a resistor R1, a resistor R2 and a capacitor C1;
one end of each of the resistor R2 and the capacitor C1 is connected with the resistor R1, and the other ends of the resistor R2 and the capacitor C1 are grounded;
the first band-pass filter circuit comprises a resistor R3, a resistor R4, a capacitor C6 and a capacitor C7;
the capacitor C6 and the capacitor C7 are connected in series and then connected with the resistor R3 in parallel, one end of the resistor R4 is connected with a connecting point of the capacitor C6 and the capacitor C7, and the other end of the resistor R4 is grounded;
the second band-pass filter circuit comprises a resistor R6, a resistor R7, a capacitor C8 and a capacitor C9;
the capacitor C8 and the capacitor C9 are connected in series and then connected with the resistor R6 in parallel, one end of the resistor R7 is connected with a connecting point of the capacitor C8 and the capacitor C9, and the other end of the resistor R7 is grounded.
Further, the noise amplification comparison circuit comprises an amplifier U1A, wherein the inverting input end of the amplifier U1A is connected with the second signal processing circuit, and the non-inverting input end of the amplifier U1A is connected with the third signal processing circuit. The output end of the amplifier U1A is connected with a filter circuit.
Further, a capacitor C2 is further connected to the connection point of the resistor R3 and the resistor R6, and the other end of the capacitor C2 is sequentially connected with the resistor R5 and the inverting input end of the amplifier UIA.
Further, the frequency equalization circuit comprises a resistor R8, a resistor R15, a capacitor C11 and a capacitor C12;
the resistor R8 and the capacitor C15 are connected in series to form a first branch;
the capacitor C11 and the capacitor C12 are connected in series to form a second branch;
the first branch circuit and the second branch circuit are connected in parallel, and two ends of the first branch circuit are respectively connected with the in-phase input end and the output end of the amplifier UIA;
one end of the resistor R15 is connected with the connection point of the capacitor C11 and the capacitor C12, and the other end of the resistor R15 is grounded.
Further, the filter circuit comprises a resistor R9, a resistor R12, a capacitor C4 and a capacitor C5;
the resistor R12 and the capacitor C4 are connected with the output end of the amplifier UIA;
the other end of the capacitor C4 is connected with a capacitor C5, and one end, far away from the capacitor C4, of the capacitor C5 is connected with a resistor R12;
one end of the resistor R9 is connected with the connection point of the capacitor C4 and the capacitor C5, and the other end of the resistor R9 is grounded.
Further, the audio amplifying circuit comprises a resistor R14, a capacitor C14 and an amplifier U1B;
the resistor R14 and the capacitor C14 are connected in parallel;
two ends of the resistor R14 are respectively connected with an inverting input end and an output end of the amplifier U1B;
the non-inverting input terminal of the amplifier U1B is grounded;
the output end of the amplifier U1B is connected with the power amplifier.
Further, a resistor R13 and a capacitor C13 are arranged between the output end of the filter circuit and the input end of the audio amplifying circuit;
one end of the resistor R13 is connected with the resistor R12 and the capacitor C5, the other end of the resistor R13 is connected with the capacitor C13, and the other end of the capacitor C13 connected with the resistor R13 is connected with the capacitor C14, the resistor R14 and the inverting input end of the amplifier UIB.
The second aspect of the present invention provides a noise reduction method applied to an environment adaptive noise reduction circuit based on frequency automatic tracking, comprising the following specific steps:
s1, a signal input circuit acquires a noise signal and a sound source signal, a first signal processing circuit processes the noise signal, and a second signal processing circuit processes the sound source signal;
s2, inputting the processed signals into a noise amplification comparison circuit, and performing voltage comparison operation on the noise signals and the audio source signals by the noise amplification comparison circuit to obtain voltage difference values of the noise signals and the audio source signals;
s3, the frequency equalization circuit tracks the voltage difference value of the noise signal and the sound source signal to obtain the noise signal with the same waveform as the sound source signal;
s3, the filter circuit receives the output signal of the noise amplification comparison circuit for filtering, and outputs the filtered signal to the audio amplification circuit;
s4, the audio amplifying circuit carries out reverse conversion on the waveform and outputs the waveform.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, through comparing and tracking the voltage difference values of the noise signal and the audio source signal, a reverse signal is output to offset external noise, so that the environment self-adaptive noise reduction is ensured in a noisy environment;
the peak value of the output signal of the audio amplifier is accurately limited in the [ VDD, VEE ] interval, so that the noise amplifying comparator can be accurately arranged, and the situations of inaccurate adaptive noise reduction and difficult debugging in the traditional technical scheme are effectively avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 is a circuit diagram of an embodiment of the present invention.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
In the prior art, noise reduction is realized by reducing the gain of an output signal by using an environment signal detected by voice, the obvious defect of the scheme is that the background signal is greatly reduced to make the background sound unclear for the human ear hearing, so that the output signal is difficult to accurately set and has large discreteness, and the other defect is that the environment self-adaptive noise reduction automatic tracking cannot be realized.
The digital voltage limiting algorithm is realized by using the DSP, and the scheme has high precision but high cost, special algorithm is required to be designed, the development difficulty is high, and the popularization and the universality are difficult; although there are some environmental adaptive noise reduction devices in the market at present, the solution still uses amplitude reduction volume to attenuate the amplitude of the output signal to reduce the environmental noise, which also has the problem of poor accuracy mentioned above.
Example 1
As shown in fig. 1, the present embodiment provides an environment adaptive noise reduction circuit based on frequency automatic tracking, which includes a signal input circuit, a noise amplification comparison circuit, a frequency equalization circuit, a filter circuit and an audio amplification circuit;
the signal input circuit is used for acquiring a noise signal and a sound source signal and preprocessing the noise signal and the sound source signal;
the noise amplification comparison circuit is used for comparing the voltage difference value of the noise signal and the audio source signal;
the frequency equalization circuit is used for tracking the voltage difference value of the noise signal and the audio source signal;
the filter circuit is used for limiting the frequency of the output signal of the noise amplification comparison circuit in a certain range and preventing frequency interference;
the audio amplifying circuit is used for carrying out phase conversion on the processed noise signals;
the signal input circuit, the noise amplification comparison circuit, the filter circuit and the audio amplification circuit are sequentially connected;
the frequency equalization circuit is connected with the noise amplification comparison circuit in parallel;
the output end of the signal input circuit is connected with the input end of the noise amplification comparison circuit and the input end of the audio amplification circuit.
The frequency equalization circuit is connected with the noise amplification comparison circuit in parallel, the output end of the signal input circuit is connected with the input end of the noise amplification comparison circuit and the input end of the audio amplification circuit, and the signal input circuit acquires and pre-processes the noise signal and the audio signal; the noise amplification comparison circuit compares the voltage difference between the noise signal and the audio source signal; the frequency equalization circuit is used for tracking the voltage difference value of the noise signal and the audio source signal; the filter circuit limits the frequency of the output signal of the noise amplification comparison circuit in a certain range to prevent frequency interference; the audio amplifying circuit is used for carrying out phase conversion on the processed noise signals and outputting the processed noise signals, and outputting reverse signals to offset external noise through comparing and tracking the voltage difference values of the noise signals and the audio source signals, so that the environment self-adaptive noise reduction is carried out in a noisy environment.
In some possible embodiments, the signal input circuit comprises a first signal processing circuit and a second signal processing circuit;
the first signal processing circuit includes a noise input and a first voltage divider, the first voltage divider including: the resistor R10, the capacitor C3 and the resistor R1A are sequentially connected, the noise input end is connected with the resistor R10, and the noise input end adopts a sound pickup MIC;
the second signal processing circuit includes: the audio input end, the second voltage divider, the first band-pass filter circuit and the second band-pass filter circuit are connected in sequence.
In some possible embodiments, the second voltage divider comprises a resistor R1, a resistor R2, and a capacitor C1;
one end of the resistor R2 and one end of the capacitor C1 are connected with the resistor R1, and the other ends of the resistor R2 and the capacitor C1 are grounded;
the first band-pass filter circuit comprises a resistor R3, a resistor R4, a capacitor C6 and a capacitor C7;
the capacitor C6 and the capacitor C7 are connected in series and then connected with the resistor R3 in parallel, one end of the resistor R4 is connected with a connecting point of the capacitor C6 and the capacitor C7, and the other end of the resistor R4 is grounded;
the second band-pass filter circuit comprises a resistor R6, a resistor R7, a capacitor C8 and a capacitor C9;
the capacitor C8 and the capacitor C9 are connected in series and then connected with the resistor R6 in parallel, one end of the resistor R7 is connected with a connecting point of the capacitor C8 and the capacitor C9, and the other end of the resistor R7 is grounded.
In some possible embodiments, the noise amplification comparing circuit includes an amplifier U1A, an inverting input terminal of the amplifier U1A is connected to the second signal processing circuit, and a non-inverting input terminal of the amplifier U1A is connected to the third signal processing circuit. The output end of the amplifier U1A is connected with a filter circuit.
In some possible embodiments, a capacitor C2 is further connected to the connection point of the resistor R3 and the resistor R6, and the other end of the capacitor C2 is sequentially connected to the resistor R5 and the inverting input terminal of the amplifier UIA.
In some possible embodiments, the frequency equalization circuit includes a resistor R8, a resistor R15, a capacitor C11, and a capacitor C12;
the resistor R8 and the capacitor C15 are connected in series to form a first branch;
the capacitor C11 and the capacitor C12 are connected in series to form a second branch;
the first branch is connected in parallel with the second branch, and two ends of the first branch are respectively connected with the in-phase input end and the output end of the amplifier UIA;
one end of the resistor R15 is connected with the connection point of the capacitor C11 and the capacitor C12, and the other end of the resistor R15 is grounded.
In some possible embodiments, the filter circuit includes a resistor R9, a resistor R12, a capacitor C4, and a capacitor C5;
the resistor R12 and the capacitor C4 are connected with the output end of the amplifier UIA;
the other end of the capacitor C4 is connected with a capacitor C5, and one end, far away from the capacitor C4, of the capacitor C5 is connected with a resistor R12;
one end of the resistor R9 is connected with the connection point of the capacitor C4 and the capacitor C5, and the other end of the resistor R9 is grounded.
In some possible embodiments, the audio amplification circuit includes a resistor R14, a capacitor C14, and an amplifier U1B;
the resistor R14 is connected in parallel with the capacitor C14;
two ends of the resistor R14 are respectively connected with an inverting input end and an output end of the amplifier U1B;
the non-inverting input terminal of the amplifier U1B is grounded;
the output end of the amplifier U1B is connected with the power amplifier.
In some possible embodiments, a resistor R13 and a capacitor C13 are disposed between the output end of the filter circuit and the input end of the audio amplifying circuit;
one end of the resistor R13 is connected with the resistor R12 and the capacitor C5, the other end of the resistor R13 is connected with the capacitor C13, and the other end of the capacitor C13 connected with the resistor R13 is connected with the capacitor C14, the resistor R14 and the inverting input end of the amplifier UIB.
In some possible embodiments, the noise input uses the pickup WMM7027ABSN0-4/TR, or MP34DT05TR, and the consistency in the sensitivity, signal-to-noise ratio, etc. of the pickup WMM7027ABSN0-4/TR is very high, and the pickup array is easier to assemble than a conventional electret pickup, and the stability is very high. High heat-resistant temperature and strong shock resistance. In addition, the acoustic performance is good, the signal-to-noise ratio and consistency are high, the sensitivity is high, and the performance is stable at different temperatures. The pick-up has the advantages of low power consumption, wide working voltage range and strong power supply inhibition capability.
In some possible embodiments, the operational amplifiers each employ OPA2277UA or OP1177ARZ. The operational amplifier OPA2277UA has the advantages of high precision, low power consumption, low offset voltage, low offset current, low temperature drift, low noise, high gain and high common mode rejection ratio.
In this embodiment, the noise input end detects external environmental noise and sends the external environmental noise to the positive end input of the noise amplifying comparator, meanwhile, the sound source signal is sent to the negative end input of the noise amplifying comparator after distortion and pollution frequencies are filtered by the band-pass filter, and two paths of signals are matched in amplitude, phase, delay and amplification as much as possible through a frequency equalizing network by the voltage difference value input by the positive end and the negative end of the amplifying comparator. Two paths of noise signals which are transmitted through different paths of noise input ends and sound source signals under different environments output specific inverse noise frequency under the tracking of the voltage difference value of the signal noise amplifying comparator.
The output phase is opposite to the input when the input is carried out from the input end of the inverting end through the working principle of the operational amplifier, and the output phase is identical to the input when the output phase is carried out from the input end of the non-inverting end through the working principle of the operational amplifier. Because the opposite phases are counteracted, the purposes of actively suppressing and eliminating noise are achieved.
Example 2
The embodiment provides a noise reduction method applied to an environment self-adaptive noise reduction circuit based on frequency automatic tracking, which comprises the following specific steps:
s1, a signal input circuit acquires a noise signal and a sound source signal, a first signal processing circuit processes the noise signal, and a second signal processing circuit processes the sound source signal;
s2, inputting the processed signals into a noise amplification comparison circuit, and performing voltage comparison operation on the noise signals and the audio source signals by the noise amplification comparison circuit to obtain voltage difference values of the noise signals and the audio source signals;
s3, the frequency equalization circuit tracks the voltage difference value of the noise signal and the sound source signal to obtain the noise signal with the same waveform as the sound source signal;
s3, the filter circuit receives the output signal of the noise amplification comparison circuit for filtering, and outputs the filtered signal to the audio amplification circuit;
s4, the audio amplifying circuit carries out reverse conversion on the waveform and outputs the waveform.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The environment self-adaptive noise reduction circuit based on the frequency automatic tracking is characterized by comprising a signal input circuit, a noise amplification comparison circuit, a frequency equalization circuit, a filter circuit and an audio amplification circuit;
the signal input circuit is used for acquiring a noise signal and a sound source signal and preprocessing the noise signal and the sound source signal;
the noise amplification comparison circuit is used for comparing the voltage difference value of the noise signal and the audio source signal;
the frequency equalization circuit is used for tracking the voltage difference value of the noise signal and the audio source signal;
the filter circuit is used for limiting the frequency of the output signal of the noise amplification comparison circuit in a certain range and preventing frequency interference;
the audio amplifying circuit is used for carrying out phase conversion on the processed noise signals;
the signal input circuit, the noise amplification comparison circuit, the filter circuit and the audio amplification circuit are sequentially connected;
the frequency equalization circuit is connected with the noise amplification comparison circuit in parallel;
the output end of the signal input circuit is connected with the input end of the noise amplification comparison circuit and the input end of the audio amplification circuit.
2. The frequency auto-tracking based environmental adaptive noise reduction circuit of claim 1, wherein the signal input circuit comprises a first signal processing circuit and a second signal processing circuit;
the first signal processing circuit includes a noise input and a first voltage divider, the first voltage divider including: the resistor R10, the capacitor C3 and the resistor R1A are sequentially connected, and the noise input end is connected with the resistor R10;
the second signal processing circuit includes: the audio input end, the second voltage divider, the first band-pass filter circuit and the second band-pass filter circuit are connected in sequence.
3. The frequency auto-tracking based environmental adaptive noise reduction circuit according to claim 2, wherein the second voltage divider comprises a resistor R1, a resistor R2, and a capacitor C1;
one end of each of the resistor R2 and the capacitor C1 is connected with the resistor R1, and the other ends of the resistor R2 and the capacitor C1 are grounded;
the first band-pass filter circuit comprises a resistor R3, a resistor R4, a capacitor C6 and a capacitor C7;
the capacitor C6 and the capacitor C7 are connected in series and then connected with the resistor R3 in parallel, one end of the resistor R4 is connected with a connection point of the capacitor C6 and the capacitor C7, and the other end of the resistor R4 is grounded;
the second band-pass filter circuit comprises a resistor R6, a resistor R7, a capacitor C8 and a capacitor C9;
the capacitor C8 and the capacitor C9 are connected in series and then connected with the resistor R6 in parallel, one end of the resistor R7 is connected with a connecting point of the capacitor C8 and the capacitor C9, and the other end of the resistor R7 is grounded.
4. The environment self-adaptive noise reduction circuit based on frequency automatic tracking according to claim 3, wherein the noise amplification comparison circuit comprises an amplifier U1A, an inverting input end of the amplifier U1A is connected with the second signal processing circuit, a non-inverting input end of the amplifier U1A is connected with the third signal processing circuit, and an output end of the amplifier U1A is connected with the filter circuit.
5. The environment self-adaptive noise reduction circuit based on frequency automatic tracking according to claim 4, wherein a capacitor C2 is further connected at the connection point of the resistor R3 and the resistor R6, and the other end of the capacitor C2 is sequentially connected with the resistor R5 and the inverting input end of the amplifier UIA.
6. The environment-adaptive noise reduction circuit based on frequency automatic tracking according to claim 4, wherein the frequency equalization circuit comprises a resistor R8, a resistor R15, a capacitor C11 and a capacitor C12;
the resistor R8 and the capacitor C15 are connected in series to form a first branch;
the capacitor C11 and the capacitor C12 are connected in series to form a second branch;
the first branch circuit and the second branch circuit are connected in parallel, and two ends of the first branch circuit are respectively connected with the in-phase input end and the output end of the amplifier UIA;
one end of the resistor R15 is connected with the connection point of the capacitor C11 and the capacitor C12, and the other end of the resistor R15 is grounded.
7. The environment-adaptive noise reduction circuit based on frequency automatic tracking according to claim 1, wherein the filter circuit comprises a resistor R9, a resistor R12, a capacitor C4 and a capacitor C5;
the resistor R12 and the capacitor C4 are connected with the output end of the amplifier UIA;
the other end of the capacitor C4 is connected with a capacitor C5, and one end, far away from the capacitor C4, of the capacitor C5 is connected with a resistor R12;
one end of the resistor R9 is connected with the connection point of the capacitor C4 and the capacitor C5, and the other end of the resistor R9 is grounded.
8. The frequency auto-tracking based environmental adaptive noise reduction circuit according to claim 7, wherein the audio amplification circuit comprises a resistor R14, a capacitor C14, and an amplifier U1B;
the resistor R14 and the capacitor C14 are connected in parallel;
two ends of the resistor R14 are respectively connected with an inverting input end and an output end of the amplifier U1B;
the non-inverting input terminal of the amplifier U1B is grounded;
the output end of the amplifier U1B is connected with the power amplifier.
9. The environment self-adaptive noise reduction circuit based on frequency automatic tracking according to claim 8, wherein a resistor R13 and a capacitor C13 are arranged between the output end of the filter circuit and the input end of the audio amplifying circuit;
one end of the resistor R13 is connected with the resistor R12 and the capacitor C5, the other end of the resistor R13 is connected with the capacitor C13, and the other end of the capacitor C13 connected with the resistor R13 is connected with the capacitor C14, the resistor R14 and the inverting input end of the amplifier UIB.
10. A noise reduction method using the frequency auto-tracking based environment adaptive noise reduction circuit according to any one of claims 2 to 9, comprising the specific steps of:
s1, a signal input circuit acquires a noise signal and a sound source signal, a first signal processing circuit processes the noise signal, and a second signal processing circuit processes the sound source signal;
s2, inputting the processed signals into a noise amplification comparison circuit, and performing voltage comparison operation on the noise signals and the audio source signals by the noise amplification comparison circuit to obtain voltage difference values of the noise signals and the audio source signals;
s3, the frequency equalization circuit tracks the voltage difference value of the noise signal and the sound source signal to obtain the noise signal with the same waveform as the sound source signal;
s3, the filter circuit receives the output signal of the noise amplification comparison circuit for filtering, and outputs the filtered signal to the audio amplification circuit;
s4, the audio amplifying circuit carries out reverse conversion on the waveform and outputs the waveform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310141024.8A CN116074698A (en) | 2023-02-16 | 2023-02-16 | Environment self-adaptive noise reduction circuit and noise reduction method based on frequency automatic tracking |
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| CN202310141024.8A CN116074698A (en) | 2023-02-16 | 2023-02-16 | Environment self-adaptive noise reduction circuit and noise reduction method based on frequency automatic tracking |
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