Dual ANC and EQ music compensation method

Abstract

The application discloses an ANC and EQ dual music compensation method and relates to the technical field of music compensation. The ANC and EQ dual music compensation method is characterized in that: a front ANC filter is designed, the frequency band corresponding to audio is improved before noise elimination, the noise elimination process does not weaken the audio, peak filtering, high central frequency gain and frequency response are used, EQ compensation technology is used, frequency response of a system is improved, sound field frequency transmission, sound source processing, grid transition and noise reduction are improved, the interference proportion of the ANC filter and the peak filter in each frequency band is debugged through step-by-step testing of sound in different frequency bands, corresponding function curves are generated, the compensation algorithm is applied, and the ANC filter and the peak filter can actively intervene in different frequency bands, noise reduction is realized, and music distortion caused by excessive intervention is avoided.

Description

Technical Field

[0001] This invention relates to the field of music compensation technology, specifically to a dual music compensation method using ANC and EQ. Background Technology

[0002] Nowadays, with the improvement of people's living standards, the satisfaction of basic material needs has led people to pursue a higher quality of life. Many people enjoy music in their spare time. In particular, many young people choose to wear headphones and listen to rhythmic music while running or exercising, which requires the use of professional headphones.

[0003] The current problem is that when headphones are worn during exercise, wind noise can occur as people move, especially when running. Additionally, external sound sources can enter the headphones when passing through certain areas, affecting the experience. Current solutions primarily use ANC noise cancellation technology to filter out external noise, but this process inevitably damages the original sound of the music, resulting in a certain decrease in sound quality. Therefore, a dual music compensation method combining ANC and EQ is provided to solve the above problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the prior art, the present invention discloses a dual music compensation method of ANC and EQ to solve the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dual music compensation method combining ANC and EQ, comprising the following steps:

[0008] S1. Pre-amplifier ANC filter design: By designing a pre-amplifier ANC filter, the corresponding frequency band of the audio is boosted before noise is eliminated. The boost amount is equal to the amount of noise being eliminated, so that the noise elimination process does not weaken the audio.

[0009] S2, Peak Filter Design: By filtering the peaks, the center frequency gain and frequency response are increased. Using EQ compensation technology, the frequency response of the system is improved, the frequency transmission of the sound field is improved, the sound source is processed, the gradation is changed, and the noise is reduced.

[0010] S3. Frequency band tuning: By gradually testing the sound in different frequency bands, the interference ratio of the ANC filter and peak filter in each frequency band is adjusted, and the corresponding function curve is generated and applied to the compensation algorithm. In actual use, the ANC filter and peak filter can actively intervene in different frequency bands to avoid excessive intervention that causes music distortion, while achieving the best music compensation effect.

[0011] Preferably, the peak filter design involves dividing the EQ into 10 segments at the corresponding sound source frequency, with an average of one and n=1. Each segment has an adjustable gain of -12dB to 12dB, a quality factor Q of √2, upper and lower limit frequencies of 20Hz to 20kHz, a starting value of 22, an ending value of 22720, and a gain of one in each segment. The gain is divided into 25 stages.

[0012] -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. Then, based on the above parameters, design the required digital filter, mainly using the commonly used hyperbolic transformation method and impulse response invariance method. By using analog circuit formulas, derive the filter you need, and then transform it from the s-domain to the z-domain. The digital frequency domain band change is a transformation from a certain original z-plane to other z-planes.

[0013] Preferably, the effects of the EQ compensation include enhancing vocals, removing sibilance, processing music, increasing warmth, making male voices deeper, removing high and low frequency noise, and enhancing the sense of distance;

[0014] A 3dB boost at 1.8kHz (Q=1) can increase the clarity of vocals, while a 6dB boost at 1.8kHz (Q=0.5) can enhance vocals.

[0015] Sibilance is generally present at 4-5kHz. Attenuating 5kHz by -18dB with Q=100 can remove some sibilance.

[0016] Lowering 1.75kHz by -3dB on the music track, Q=1, ensures that the music doesn't drown out the vocals, thus achieving music processing.

[0017] Cut off sounds below 90Hz, boost 240Hz by 3dB, and set Q=7 to increase the feeling of warmth;

[0018] A 2dB boost at 160Hz, Q=1, makes male voices sound deeper and richer.

[0019] By boosting the mid-range frequencies, especially from 1.2kHz to 2.5kHz, the sound will appear more forward, thus adjusting the sense of distance.

[0020] Preferably, during the frequency band debugging process, in the testing phase, the noise of the primary and secondary sound sources is first attenuated by an ANC filter, and the audio signal is converted into a digital signal by a controller to generate a continuous digital signal waveform function. Then, the noise band is attenuated within a reasonable range, and the attenuation ratio is preset. At the same time, when the audio is attenuated, the original music is automatically boosted to achieve the anti-attenuation effect of the original sound.

[0021] Preferably, the pre-amplifier ANC filter employs an adaptive ANC system, which identifies the main noise source and focuses the ANC system on that frequency range. This is achieved using additional DSP software algorithms. In addition, to identify the ambient noise profile, the feedforward ANC microphone also feeds in a low-latency ANC-DSP and a second DSP. Based on this ambient noise profile, the ANC filter coefficients that define the headphone's ANC characteristics can be reconfigured.

[0022] Preferably, after the frequency band adjustment completes the anti-attenuation of the audio, the original sound quality of the music is affected to a certain extent, and some mixing effects of the original sound effects are distorted. At this time, this part is boosted again by EQ compensation, so as to achieve the effect of perfect sound quality restoration. Under the premise of achieving noise reduction, it does not affect the timbre and sound quality of the music.

[0023] This invention discloses a dual music compensation method combining ANC and EQ, which has the following beneficial effects:

[0024] 1. This dual ANC and EQ music compensation method utilizes a pre-designed ANC filter to boost the corresponding frequency bands of the audio before noise is eliminated. The boost amount is equal to the amount being eliminated, ensuring that the noise elimination process does not weaken the audio. Simultaneously, peak filtering increases the center frequency gain and frequency response. EQ compensation technology is then used to improve the system's frequency response, sound field frequency transmission, sound source processing, frame transitions, and reduce noise. During the combination of these two methods, different frequency bands are tested step-by-step, and the interference ratio of the ANC and peak filters is adjusted for each band. Corresponding function curves are generated and applied to the compensation algorithm. In practical use, the ANC and peak filters can actively intervene in different frequency bands. After anti-attenuation of the audio, some distortion in the original sound effects' mixing is addressed through EQ compensation, which boosts this distortion, achieving a perfect restoration of sound quality. This achieves noise reduction without affecting the timbre or sound quality of the music, avoiding excessive intervention that could cause distortion. Attached Figure Description

[0025] Figure 1This is a flowchart of the music compensation method of the present invention;

[0026] Figure 2 This is a schematic diagram of the ANC compensation technology of the present invention;

[0027] Figure 3 This is a schematic diagram of the EQ compensation technology of the present invention. Detailed Implementation

[0028] This invention discloses a dual music compensation method combining ANC and EQ, such as... Figure 1-3 As shown, in order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and through embodiments.

[0029] like Figure 1-3 The method for dual music compensation using ANC and EQ includes the following steps:

[0030] S1. Pre-amplifier ANC filter design: By designing a pre-amplifier ANC filter, the corresponding frequency band of the audio is boosted before noise is eliminated. The boost amount is equal to the amount of noise being eliminated, so that the noise elimination process does not weaken the audio.

[0031] S2, Peak Filter Design: By filtering the peaks, the center frequency gain and frequency response are increased. Using EQ compensation technology, the frequency response of the system is improved, the frequency transmission of the sound field is improved, the sound source is processed, the gradation is changed, and the noise is reduced.

[0032] S3. Frequency band tuning: By gradually testing the sound in different frequency bands, the interference ratio of the ANC filter and peak filter in each frequency band is adjusted, and the corresponding function curve is generated and applied to the compensation algorithm. In actual use, the ANC filter and peak filter can actively intervene in different frequency bands to avoid excessive intervention that causes music distortion, while achieving the best music compensation effect.

[0033] More specifically, the peak filter design divides the EQ into 10 segments at the corresponding sound source frequency, with an average of one and n=1. Each segment has an adjustable gain of -12dB to 12dB, a quality factor Q of √2, upper and lower limit frequencies of 20Hz to 20kHz, a starting value of 22, an ending value of 22720, and a gain of one in each segment. The gain is divided into 25 stages.

[0034] -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. Then, based on the above parameters, design the required digital filter, mainly using the commonly used hyperbolic transformation method and impulse response invariance method. By using analog circuit formulas, derive the filter you need, and then transform it from the s-domain to the z-domain. The digital frequency domain band change is a transformation from a certain original z-plane to other z-planes.

[0035] More specifically, the effects of EQ compensation include enhancing vocals, removing sibilance, processing music, increasing warmth, making male voices deeper, removing high and low frequency noise, and enhancing the sense of distance.

[0036] A 3dB boost at 1.8kHz (Q=1) can increase the clarity of vocals, while a 6dB boost at 1.8kHz (Q=0.5) can enhance vocals.

[0037] Sibilance is generally present at 4-5kHz. Attenuating 5kHz by -18dB with Q=100 can remove some sibilance.

[0038] Lowering 1.75kHz by -3dB on the music track, Q=1, ensures that the music doesn't drown out the vocals, thus achieving music processing.

[0039] Cut off sounds below 90Hz, boost 240Hz by 3dB, and set Q=7 to increase the feeling of warmth;

[0040] A 2dB boost at 160Hz, Q=1, makes male voices sound deeper and richer.

[0041] By boosting the mid-range frequencies, especially from 1.2kHz to 2.5kHz, the sound will appear more forward, thus adjusting the sense of distance.

[0042] More specifically, during the frequency band tuning process, in the testing phase, the noise from the primary and secondary sound sources is first attenuated by an ANC filter. The audio signal is then converted into a digital signal by a controller to generate a continuous digital signal waveform function. The noise band is then attenuated within a reasonable range, with the attenuation ratio preset. At the same time, the original music is automatically boosted during audio attenuation to achieve an anti-attenuation effect for the original sound.

[0043] More specifically, the pre-amplifier ANC filter employs an adaptive ANC system, which identifies the main noise sources and focuses the ANC system on that frequency range using additional DSP software algorithms. In addition, to identify the ambient noise profile, the feedforward ANC microphone also feeds in a low-latency ANC-DSP and a second DSP. Based on this ambient noise profile, the ANC filter coefficients that define the headphone's ANC characteristics can be reconfigured.

[0044] More specifically, after frequency band tuning completes the anti-attenuation of audio, the original sound quality of the music is affected to some extent, and some mixing effects of the original sound effects are distorted. At this time, EQ compensation is used to boost this part again, thereby achieving the effect of perfect sound quality restoration. While achieving noise reduction, it does not affect the timbre and sound quality of the music.

[0045] Working Principle: This dual ANC and EQ music compensation method uses a pre-designed ANC filter to boost the corresponding frequency bands of the audio before noise is eliminated. The boost amount is equal to the amount being eliminated, ensuring that the noise elimination process does not weaken the audio. Simultaneously, peak filtering increases the center frequency gain and frequency response. EQ compensation technology is then used to improve the system's frequency response, sound field frequency transmission, sound source processing, frame transitions, and reduce noise. During the combination of these two methods, different frequency bands are tested step-by-step, and the interference ratio of the ANC and peak filters is adjusted for each band. This generates corresponding function curves that are applied to the compensation algorithm. In practical use, the ANC and peak filters can actively intervene in different frequency bands. After anti-attenuation of the audio, some distortion in the original sound effects' mixing is addressed through EQ compensation, which boosts this distortion, achieving a perfect restoration of sound quality. This achieves noise reduction without affecting the timbre or sound quality of the music, avoiding excessive intervention that could cause distortion.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method of ANC and EQ dual music compensation, characterized in that, The following steps are included: S1. Pre-amplifier ANC filter design: By designing a pre-amplifier ANC filter, the corresponding frequency band of the audio is boosted before noise is eliminated. The boost amount is equal to the amount to be eliminated, so that the noise elimination process does not weaken the audio. The pre-amplifier ANC filter adopts an adaptive ANC system, which identifies the main noise source and focuses the ANC system on the frequency range corresponding to the main ambient noise. It is implemented using additional DSP software algorithms. At the same time, in order to identify the ambient noise curve, the feedforward ANC microphone also feeds the ambient noise signal into the low-latency ANC-DSP and the second DSP. Based on this ambient noise profile, the ANC filter coefficients that define the headphone ANC characteristics can be reconfigured. S2, Peak Filter Design: By filtering the spikes, the center frequency gain and frequency response are increased. Using EQ compensation technology, the frequency response of the system is improved, the frequency transmission of the sound field is improved, the sound source is processed, the style is changed, and the noise is reduced. S3. Frequency band tuning involves progressively testing different frequency bands and adjusting the interference ratio of the ANC filter and peak filter in each band. This generates corresponding function curves that are applied to the compensation algorithm. In practical use, the ANC filter and peak filter can actively intervene in different frequency bands, avoiding excessive intervention that could cause music distortion, while achieving the best music compensation effect. During the frequency band tuning process, in the testing phase, the ANC filter is first used to attenuate the noise from the primary and secondary sound sources. The controller converts the audio signal into a digital signal, generating a continuous digital signal waveform function. Then, the noise band is attenuated within a reasonable range, with the attenuation ratio preset. Simultaneously, during audio attenuation, the original music is automatically boosted, thus achieving an anti-attenuation effect for the original sound.

2. The ANC and EQ dual music compensation method of claim 1, wherein: The effects of the EQ compensation include enhancing vocals, removing sibilance, increasing warmth, making male voices deeper, removing high and low frequency noise, and enhancing the sense of distance. A 3dB boost at 1.8kHz, with Q=1, can increase the clarity of vocals; A 6dB boost at 1.8kHz, with Q=0.5, enhances vocals; A -18dB attenuation at 5kHz with Q=100 can remove sibilance; Cut off frequencies below 90Hz, boost 240Hz by 3dB, and add a warm feeling with Q=7; A 2dB boost at 160Hz, Q=1, makes male voices sound richer and fuller; By boosting the midrange frequencies from 1.2kHz to 2.5kHz, the sound will appear more forward, thus adjusting the sense of distance. Q is the quality factor.

3. The dual music compensation method with ANC and EQ according to claim 1, characterized in that: After the frequency band adjustment completes the anti-attenuation of the audio, the original sound quality of the music is interfered with, and some mixing effects of the original sound effects are distorted. At this time, the damaged audio frequency band is boosted again through EQ compensation, so as to achieve noise reduction without affecting the timbre and sound quality of the music.

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