WO2018157266A1 - Headphone circuit with adjustable feedback-type active noise-reduction level - Google Patents

Headphone circuit with adjustable feedback-type active noise-reduction level Download PDF

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Publication number
WO2018157266A1
WO2018157266A1 PCT/CN2017/000312 CN2017000312W WO2018157266A1 WO 2018157266 A1 WO2018157266 A1 WO 2018157266A1 CN 2017000312 W CN2017000312 W CN 2017000312W WO 2018157266 A1 WO2018157266 A1 WO 2018157266A1
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Prior art keywords
gain
audio
noise
signal
adjustable
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PCT/CN2017/000312
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French (fr)
Chinese (zh)
Inventor
杨少聪
王安勇
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富士高实业有限公司
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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups

Definitions

  • the present invention relates to the field of earphone circuit technologies, and in particular, to a headphone circuit with an adjustable feedback active noise reduction level.
  • the feedback active noise reduction level, the active noise reduction level and the music equalizer adjustment of the earphone all use the same earphone gain, and the prior art has the disadvantage that the music frequency gain is affected by the feedback active noise reduction level. The impact has a great impact on the sound quality of the headphones.
  • the invention discloses an earphone circuit with an adjustable feedback active noise reduction level, which is used for the earphone to realize an adjustable feedback active noise reduction level, an active noise reduction level and a music equalizer adjustment, all using a gain control. And the audio signal gain is not affected by the feedback active noise reduction level.
  • the signal is amplified by amplifying the output portion, and then the signal is output;
  • the noise input portion includes a microphone, a first filter, and the microphone receives a mixed signal of natural noise and a sound returned by the speaker, and amplifies the mixed signal to form a feedback-type active noise-reduction noise signal, and the noise signal is filtered by the first Perform noise filtering;
  • the audio input portion includes an audio source and a second filter, and the audio signal of the audio source is After the line is amplified, the output is output to the second filter, and the second filter filters the audio signal to output the filtered audio signal;
  • the amplified output portion includes: an adjustable amplifier, a second adder, an amplifier, and a speaker, wherein the noise signal of the noise input portion and the audio signal of the audio input portion are mixed, outputted to the adjustable amplifier, and the adjustable amplifier pairs the mixed signal
  • the tunable amplification is performed, and then the audio signal of the audio source is mixed by the second adder, output to the amplifier for amplification, and then output to the speaker.
  • the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A
  • the gain of the second filter For B, the gain of the adjustable amplifier is g
  • the noise gain of the system is:
  • the audio gain of the system is: 1+B ⁇ g;
  • the total gain of the headphone circuit is:
  • the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A
  • the gain of the second filter For B to satisfy A ⁇ B then:
  • the audio input portion further includes a second adjustable amplifier
  • the amplified audio signal is input to the second filter;
  • the gain of the first adjustable amplifier is set to g1
  • the gain of the second adjustable amplifier is g2
  • the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A
  • the gain of the second filter is B
  • the noise gain of the system is:
  • the audio gain of the system is: 1+B ⁇ g2 ⁇ g1;
  • the total gain of the headphone circuit is:
  • the present invention includes the following advantages:
  • the earphone circuit with adjustable feedback active noise reduction level of the invention adjusts the adjustable feedback active noise reduction level, active noise reduction level and music equalizer existing in the prior art by setting an adjustable amplifier
  • the problem of using one gain control is solved, and the gain of the audio signal is not affected by the feedback active noise reduction level.
  • the invention has the advantages of simple structure, convenient use and obvious effect of improving the sound quality of the earphone.
  • FIG. 1 is a circuit diagram of one embodiment of an earphone circuit of the present invention having an adjustable feedback active noise reduction level.
  • FIG. 2 is a waveform diagram of the noise reduction gain of the earphone circuit with adjustable feedback active noise reduction level of the present invention as it changes with the adjustable amplifier.
  • FIG. 3 is a diagram showing the audio gain waveform of the earphone circuit with adjustable feedback active noise reduction level of the present invention as it changes with the adjustable amplifier.
  • FIG. 4 is a diagram showing the total gain waveform of the circuit of the earphone circuit with adjustable feedback active noise reduction level of the present invention as it changes with the adjustable amplifier.
  • FIG. 5 is a circuit diagram of another embodiment of an earphone circuit of the present invention having an adjustable feedback active noise reduction level.
  • the earphone circuit having an adjustable feedback active noise reduction level includes:
  • the signal is amplified by the amplified output portion 3, and then the signal is output;
  • the noise input part 1 includes a microphone, a first filter, and the microphone receives a mixed signal of natural noise and a sound returned by the speaker, and amplifies the mixed signal to form a feedback-type active noise-reduction noise signal, and the noise signal passes through the first Filter for noise filtering;
  • the audio input part 2 includes an audio source and a second filter. After the audio signal of the audio source is amplified, the audio signal is output to a second filter, and the second filter filters the audio signal to output the filtered audio signal.
  • the amplified output portion 3 includes: an adjustable amplifier, a second adder, an amplifier, a speaker, and the noise signal of the noise input portion 1 and the audio signal of the audio input portion 2 are mixed, and output to an adjustable amplifier, an adjustable amplifier Adjustable mixing of the mixed signal, then audio with the audio source
  • the signal is mixed by a second adder, output to an amplifier for amplification, and then output to a speaker.
  • the microphone of the earphone is placed in front of the speaker, the microphone receives the noise of the natural environment and the sound of the feedback of the speaker, and the amplified sound is amplified by the amplifier provided by the microphone, and since the microphone receives the feedback sound of the speaker, therefore, The noise part of the mixed noise is suppressed, and the feedback active noise reduction is formed. Since the amplified output part is provided with an adjustable amplifier, an adjustable feedback active noise reduction is formed in the noise input part.
  • the active noise reduction level of the earphone circuit does not have an adjustable amplifier.
  • a feedback system is formed next to the speaker, and the feedback active noise reduction system gains the noise in the front room of the earphone. Audio, therefore, the noise gain of the prior art earphone circuit with adjustable feedback active noise reduction level is:
  • the input compensation EQ is designed as:
  • the noise gain of the system is:
  • the system's audio gain is: 1+B ⁇ g (5)
  • the total gain of the headphone circuit is:
  • FIG. 2 is a waveform diagram of the noise reduction gain of the earphone circuit with adjustable feedback active noise reduction level of the present invention as a function of the adjustable amplifier, as shown in FIG. 2, by adjusting the variable resistance of the adjustable amplifier, when When the variable resistors are set to three levels of high, medium and low respectively, the active noise reduction gain changes with the change of the noise signal frequency, and the noise gain decreases with the increase of the adjustable resistance of the adjustable amplifier. .
  • FIG. 3 is an audio gain waveform diagram of the earphone circuit with adjustable feedback active noise reduction level of the present invention as a function of the adjustable amplifier, as shown in FIG. 3, by adjusting the variable resistance of the adjustable amplifier,
  • the variable resistance is set to three levels of high, medium, and low, respectively.
  • the audio signal gain changes as the frequency of the audio signal changes.
  • Fig. 2 when the gain of the audio signal becomes larger, the gain of the noise signal decreases. At 0-1 kHz, the gain varies greatly, and the gain of the audio signal decreases with the adjustable resistance of the tunable amplifier.
  • the gain of the noise signal increases as the adjustable resistance of the adjustable amplifier decreases.
  • FIG. 4 is a circuit diagram showing the total gain waveform of the earphone circuit with adjustable feedback active noise reduction level of the present invention as a function of the adjustable amplifier, as shown in FIG. 4, by adjusting the variable resistance of the adjustable amplifier, when When the variable resistors are set to three levels of high, medium and low respectively, the total gain of the system changes with the change of the mixed signal frequency. However, at the same mixed signal frequency, the difference of the gain does not change with the gain. Obviously, the gain values are consistent.
  • the audio input portion 2 further includes a second adjustable amplifier
  • the amplified audio signal is input to the second filter;
  • the gain of the first adjustable amplifier is set to g1
  • the gain of the second adjustable amplifier is g2
  • the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A
  • the gain of the second filter is B
  • the noise gain of the system is:
  • the audio gain of the system is: 1+B ⁇ g2 ⁇ g1 (9)
  • the total gain of the headphone circuit is:
  • the earphone circuit with adjustable feedback active noise reduction level provided by the present invention is described in detail above.
  • the principle and implementation manner of the present invention are described in the following.
  • the description of the above embodiment is only The method for understanding the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The description should not be construed as limiting the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Quality & Reliability (AREA)
  • Computational Linguistics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Headphones And Earphones (AREA)

Abstract

A headphone circuit with an adjustable feedback-type active noise-reduction level, the circuit comprising: a noise input section (1), an audio input section (2) and an amplification output section (3), wherein after the noise input section (1) is mixed with the audio input section (2) by means of an adder, the amplification output section (3) amplifies a signal and then outputs the signal; and the amplification output section (3) returns an output audio signal to the noise input section (1) to form adjustable feedback-type active noise reduction. By means of providing an adjustable amplifier in the headphone circuit with an adjustable feedback-type active noise-reduction level, the problem existing in the prior art of the adjustment for all of an adjustable feedback-type active noise-reduction level, an active noise-reduction level and a music equalizer being controlled by using one gain is solved, and the gain of an audio signal is not influenced by the feedback-type active noise-reduction level; and the structure thereof is simple, the usage thereof is convenient, and the sound quality of the headphone is significantly improved.

Description

具有可调反馈式主动降噪电平的耳机电路Headphone circuit with adjustable feedback active noise reduction level 技术领域Technical field
本发明涉及耳机电路技术领域，尤其涉及一种具有可调反馈式主动降噪电平的耳机电路。The present invention relates to the field of earphone circuit technologies, and in particular, to a headphone circuit with an adjustable feedback active noise reduction level.
背景技术Background technique
在现有技术中，耳机的反馈式主动降噪电平、主动降噪电平和音乐均衡器调节都使用同一个耳机增益，现有技术存在的缺点是音乐频率增益受反馈式主动降噪电平的影响，对耳机的音质影响很大。In the prior art, the feedback active noise reduction level, the active noise reduction level and the music equalizer adjustment of the earphone all use the same earphone gain, and the prior art has the disadvantage that the music frequency gain is affected by the feedback active noise reduction level. The impact has a great impact on the sound quality of the headphones.
因此，现有技术需要改进。Therefore, the prior art needs improvement.
发明内容Summary of the invention
本发明公开了一种具有可调反馈式主动降噪电平的耳机电路，用以使耳机实现可调反馈式主动降噪电平、主动降噪电平和音乐均衡器调节都使用一个增益控制，且音频信号增益不受反馈式主动降噪电平影响。The invention discloses an earphone circuit with an adjustable feedback active noise reduction level, which is used for the earphone to realize an adjustable feedback active noise reduction level, an active noise reduction level and a music equalizer adjustment, all using a gain control. And the audio signal gain is not affected by the feedback active noise reduction level.
本发明实施例提供的一种具有可调反馈式主动降噪电平的耳机电路，包括：An earphone circuit with an adjustable feedback active noise reduction level according to an embodiment of the present invention includes:
噪声输入部分、音频输入部分、放大输出部分；a noise input portion, an audio input portion, and an amplified output portion;
所述噪声输入部分与所述音频输入部分通过加法器混合后，通过放大输出部分对信号放大，然后将信号输出；After the noise input portion and the audio input portion are mixed by an adder, the signal is amplified by amplifying the output portion, and then the signal is output;
所述噪声输入部分包括麦克风、第一过滤器，所述麦克风接收自然界的噪声与扬声器回传声音的混合信号，将混合信号放大，形成反馈式主动降噪的噪声信号，噪声信号经第一过滤器进行噪声过滤；The noise input portion includes a microphone, a first filter, and the microphone receives a mixed signal of natural noise and a sound returned by the speaker, and amplifies the mixed signal to form a feedback-type active noise-reduction noise signal, and the noise signal is filtered by the first Perform noise filtering;
所述音频输入部分包括音频源、第二过滤器，所述音频源的音频信号进 行放大后，输出至第二过滤器，第二过滤器对音频信号进行过滤，输出过滤后的音频信号；The audio input portion includes an audio source and a second filter, and the audio signal of the audio source is After the line is amplified, the output is output to the second filter, and the second filter filters the audio signal to output the filtered audio signal;
所述放大输出部分包括：可调放大器、第二加法器、放大器、扬声器，所述将噪声输入部分的噪声信号和音频输入部分的音频信号混合，输出至可调放大器，可调放大器对混合信号进行可调放大，然后与音频源的音频信号通过第二加法器混合，输出至放大器进行放大，然后输出至扬声器。The amplified output portion includes: an adjustable amplifier, a second adder, an amplifier, and a speaker, wherein the noise signal of the noise input portion and the audio signal of the audio input portion are mixed, outputted to the adjustable amplifier, and the adjustable amplifier pairs the mixed signal The tunable amplification is performed, and then the audio signal of the audio source is mixed by the second adder, output to the amplifier for amplification, and then output to the speaker.
在基于本发明上述具有可调反馈式主动降噪电平的耳机电路的另一个实施例中，所述扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B，可调放大器的增益为g，则：In another embodiment of the above earphone circuit having an adjustable feedback active noise reduction level based on the present invention, the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A, and the gain of the second filter For B, the gain of the adjustable amplifier is g, then:
***的噪声增益为：
Figure PCTCN2017000312-appb-000001
The noise gain of the system is:
Figure PCTCN2017000312-appb-000001
***的音频增益为：1+B×g；The audio gain of the system is: 1+B×g;
耳机电路的总增益为：
Figure PCTCN2017000312-appb-000002
The total gain of the headphone circuit is:
Figure PCTCN2017000312-appb-000002
在基于本发明上述具有可调反馈式主动降噪电平的耳机电路的另一个实施例中，所述扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B满足A≈B，则：In another embodiment of the above earphone circuit having an adjustable feedback active noise reduction level based on the present invention, the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A, and the gain of the second filter For B to satisfy A≈B, then:
Figure PCTCN2017000312-appb-000003
Figure PCTCN2017000312-appb-000003
在基于本发明上述具有可调反馈式主动降噪电平的耳机电路的另一个实施例中，所述音频输入部分还包括第二可调放大器；In another embodiment of the above earphone circuit having an adjustable feedback active noise reduction level based on the present invention, the audio input portion further includes a second adjustable amplifier;
所述音频源的音频信号输出至第二可调放大器进行可调放大后，将放大后的音频信号输入至第二过滤器；After the audio signal of the audio source is output to the second adjustable amplifier for adjustable amplification, the amplified audio signal is input to the second filter;
设置第一可调放大器的增益为g1，第二可调放大器的增益为g2，扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B，则： The gain of the first adjustable amplifier is set to g1, the gain of the second adjustable amplifier is g2, the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A, and the gain of the second filter is B, then:
***的噪声增益为：
Figure PCTCN2017000312-appb-000004
The noise gain of the system is:
Figure PCTCN2017000312-appb-000004
***的音频增益为：1+B×g2×g1；The audio gain of the system is: 1+B×g2×g1;
耳机电路的总增益为：
Figure PCTCN2017000312-appb-000005
The total gain of the headphone circuit is:
Figure PCTCN2017000312-appb-000005
令B×g2×g1≈A×g1，则：Let B × g2 × g1 ≈ A × g1, then:
Figure PCTCN2017000312-appb-000006
Figure PCTCN2017000312-appb-000006
与现有技术相比，本发明包括以下优点：Compared with the prior art, the present invention includes the following advantages:
本发明的具有可调反馈式主动降噪电平的耳机电路，通过设置一个可调放大器，使现有技术中存在的可调反馈式主动降噪电平、主动降噪电平和音乐均衡器调节都使用一个增益控制的问题得到解决，且音频信号增益不受反馈式主动降噪电平影响，本发明结构简单，使用方便，提升耳机音质效果明显。The earphone circuit with adjustable feedback active noise reduction level of the invention adjusts the adjustable feedback active noise reduction level, active noise reduction level and music equalizer existing in the prior art by setting an adjustable amplifier The problem of using one gain control is solved, and the gain of the audio signal is not affected by the feedback active noise reduction level. The invention has the advantages of simple structure, convenient use and obvious effect of improving the sound quality of the earphone.
附图说明DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所使用的附图做一简单地介绍。In order to more clearly illustrate the embodiments of the present invention or the prior art, the drawings used in the embodiments or the prior art description will be briefly described below.
图1是本发明的具有可调反馈式主动降噪电平的耳机电路的一个实施例的电路图。1 is a circuit diagram of one embodiment of an earphone circuit of the present invention having an adjustable feedback active noise reduction level.
图2是本发明的具有可调反馈式主动降噪电平的耳机电路在随可调放大器变化时的降噪增益波形图。2 is a waveform diagram of the noise reduction gain of the earphone circuit with adjustable feedback active noise reduction level of the present invention as it changes with the adjustable amplifier.
图3是本发明的具有可调反馈式主动降噪电平的耳机电路在随可调放大器变化时的音频增益波形图。3 is a diagram showing the audio gain waveform of the earphone circuit with adjustable feedback active noise reduction level of the present invention as it changes with the adjustable amplifier.
图4是本发明的具有可调反馈式主动降噪电平的耳机电路在随可调放大器变化时的电路总增益波形图。 4 is a diagram showing the total gain waveform of the circuit of the earphone circuit with adjustable feedback active noise reduction level of the present invention as it changes with the adjustable amplifier.
图5是本发明的具有可调反馈式主动降噪电平的耳机电路的另一个实施例的电路图。5 is a circuit diagram of another embodiment of an earphone circuit of the present invention having an adjustable feedback active noise reduction level.
图中：1噪声输入部分、2音频输入部分、3放大输出部分In the figure: 1 noise input part, 2 audio input part, 3 amplified output part
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is only a part of the embodiments of the invention, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
图1是本发明的具有可调反馈式主动降噪电平的耳机电路的一个实施例的电路图，如图1所示，所述具有可调反馈式主动降噪电平的耳机电路包括：1 is a circuit diagram of an embodiment of an earphone circuit having an adjustable feedback active noise reduction level of the present invention. As shown in FIG. 1, the earphone circuit having an adjustable feedback active noise reduction level includes:
噪声输入部分1、音频输入部分2、放大输出部分3； Noise input part 1, audio input part 2, enlarged output part 3;
所述噪声输入部分1与所述音频输入部分2通过加法器混合后，通过放大输出部分3对信号放大，然后将信号输出；After the noise input portion 1 and the audio input portion 2 are mixed by an adder, the signal is amplified by the amplified output portion 3, and then the signal is output;
所述噪声输入部分1包括麦克风、第一过滤器，所述麦克风接收自然界的噪声与扬声器回传声音的混合信号，将混合信号放大，形成反馈式主动降噪的噪声信号，噪声信号经第一过滤器进行噪声过滤；The noise input part 1 includes a microphone, a first filter, and the microphone receives a mixed signal of natural noise and a sound returned by the speaker, and amplifies the mixed signal to form a feedback-type active noise-reduction noise signal, and the noise signal passes through the first Filter for noise filtering;
所述音频输入部分2包括音频源、第二过滤器，所述音频源的音频信号进行放大后，输出至第二过滤器，第二过滤器对音频信号进行过滤，输出过滤后的音频信号；The audio input part 2 includes an audio source and a second filter. After the audio signal of the audio source is amplified, the audio signal is output to a second filter, and the second filter filters the audio signal to output the filtered audio signal.
所述放大输出部分3包括：可调放大器、第二加法器、放大器、扬声器，所述将噪声输入部分1的噪声信号和音频输入部分2的音频信号混合，输出至可调放大器，可调放大器对混合信号进行可调放大，然后与音频源的音频 信号通过第二加法器混合，输出至放大器进行放大，然后输出至扬声器。The amplified output portion 3 includes: an adjustable amplifier, a second adder, an amplifier, a speaker, and the noise signal of the noise input portion 1 and the audio signal of the audio input portion 2 are mixed, and output to an adjustable amplifier, an adjustable amplifier Adjustable mixing of the mixed signal, then audio with the audio source The signal is mixed by a second adder, output to an amplifier for amplification, and then output to a speaker.
在具体的实施例中，耳机的麦克风置于扬声器前，麦克风接收自然界的噪音和扬声器反馈的声音，经过麦克风自带的放大器，将混合的声音放大，由于麦克风接收了扬声器的反馈声音，因此，混合噪声中的噪声部分得到了抑制，形成了反馈式主动降噪，由于放大输出部分设置可调放大器，因此，在噪声输入部分形成的是可调反馈式主动降噪。In a specific embodiment, the microphone of the earphone is placed in front of the speaker, the microphone receives the noise of the natural environment and the sound of the feedback of the speaker, and the amplified sound is amplified by the amplifier provided by the microphone, and since the microphone receives the feedback sound of the speaker, therefore, The noise part of the mixed noise is suppressed, and the feedback active noise reduction is formed. Since the amplified output part is provided with an adjustable amplifier, an adjustable feedback active noise reduction is formed in the noise input part.
设置扬声器、第一过滤器、放大器、麦克风的增益之积为反馈***的开环增益A，第二过滤器的增益为B，可调放大器的增益为g，由于现有技术的具有可调反馈式主动降噪电平的耳机电路没有设置可调放大器，它通过将麦克风置于耳机前室内，在扬声器旁边形成反馈***，反馈式主动降噪***增益的同时，改变了耳机前室内的噪音和音频，因此，现有技术的具有可调反馈式主动降噪电平的耳机电路的噪声增益为：Set the gain of the speaker, the first filter, the amplifier, and the microphone to the open loop gain A of the feedback system, the gain of the second filter to B, and the gain of the adjustable amplifier to g, due to the adjustable feedback of the prior art. The active noise reduction level of the earphone circuit does not have an adjustable amplifier. By placing the microphone in the front of the earphone, a feedback system is formed next to the speaker, and the feedback active noise reduction system gains the noise in the front room of the earphone. Audio, therefore, the noise gain of the prior art earphone circuit with adjustable feedback active noise reduction level is:
Figure PCTCN2017000312-appb-000007
Figure PCTCN2017000312-appb-000007
A的值越大，耳机电路的衰减越大，为了使扬声器保持原来的耳机电路总增益、音频均衡器增益，输入补偿EQ设计为：The larger the value of A, the greater the attenuation of the earphone circuit. In order to keep the original earphone circuit gain and audio equalizer gain, the input compensation EQ is designed as:
EQ≈1+A    (2)EQ≈1+A (2)
因此，耳机电路总增益为：Therefore, the total gain of the headphone circuit is:
Figure PCTCN2017000312-appb-000008
Figure PCTCN2017000312-appb-000008
但是，由于改变反馈***的开环增益A需要对输入补偿增益EQ进行重新设计，而现有技术的反馈***的开环增益A和输入补偿增益EQ是固定的，在本发明的实施例中，由于设置了可调放大器，因此，However, since changing the open loop gain A of the feedback system requires redesigning the input compensation gain EQ, the open loop gain A and the input compensation gain EQ of the prior art feedback system are fixed, in an embodiment of the invention, Since the adjustable amplifier is set, therefore,
***的噪声增益为：
Figure PCTCN2017000312-appb-000009
The noise gain of the system is:
Figure PCTCN2017000312-appb-000009
***的音频增益为：1+B×g    (5) The system's audio gain is: 1+B×g (5)
耳机电路的总增益为：
Figure PCTCN2017000312-appb-000010
The total gain of the headphone circuit is:
Figure PCTCN2017000312-appb-000010
设定扬声器、第一过滤器、放大器、麦克风的增益之积为反馈***的开环增益A，第二过滤器的增益为B满足A≈B，则：Set the gain of the speaker, the first filter, the amplifier, and the microphone to the open loop gain A of the feedback system, and the gain of the second filter to B satisfies A≈B, then:
Figure PCTCN2017000312-appb-000011
Figure PCTCN2017000312-appb-000011
由此，仅适用扬声器可得到接近于原音频增益，且较少受可调放大器增益g或主动降噪电平变化的影响。Thus, only the speaker can be approximated to the original audio gain and less affected by the adjustable amplifier gain g or active noise reduction level.
图2是本发明的具有可调反馈式主动降噪电平的耳机电路在随可调放大器变化时的降噪增益波形图，如图2所示，通过调整可调放大器的可变电阻，当可变电阻分别设置为高、中、低三个档次的时候，随着噪声信号频率的变化，主动降噪增益随之变化，噪声增益随着可调放大器的可调电阻的增大而减小。2 is a waveform diagram of the noise reduction gain of the earphone circuit with adjustable feedback active noise reduction level of the present invention as a function of the adjustable amplifier, as shown in FIG. 2, by adjusting the variable resistance of the adjustable amplifier, when When the variable resistors are set to three levels of high, medium and low respectively, the active noise reduction gain changes with the change of the noise signal frequency, and the noise gain decreases with the increase of the adjustable resistance of the adjustable amplifier. .
图3是本发明的具有可调反馈式主动降噪电平的耳机电路在随可调放大器变化时的音频增益波形图，如图3所示，通过调整可调放大器的可变电阻，当可变电阻分别设置为高、中、低三个档次的时候，随着音频信号频率的变化，音频信号增益随之变化。结合图2可知，当音频信号增益变大时，噪声信号的增益则减小，在0-1KHz时，增益的变化幅度较大，音频信号的增益随着可调放大器的可调电阻的减小而减小，噪声信号的增益随着可调放大器的可调电阻的减小而增大。3 is an audio gain waveform diagram of the earphone circuit with adjustable feedback active noise reduction level of the present invention as a function of the adjustable amplifier, as shown in FIG. 3, by adjusting the variable resistance of the adjustable amplifier, When the variable resistance is set to three levels of high, medium, and low, respectively, the audio signal gain changes as the frequency of the audio signal changes. As can be seen from Fig. 2, when the gain of the audio signal becomes larger, the gain of the noise signal decreases. At 0-1 kHz, the gain varies greatly, and the gain of the audio signal decreases with the adjustable resistance of the tunable amplifier. On the other hand, the gain of the noise signal increases as the adjustable resistance of the adjustable amplifier decreases.
图4是本发明的具有可调反馈式主动降噪电平的耳机电路在随可调放大器变化时的电路总增益波形图，如图4所示，通过调整可调放大器的可变电阻，当可变电阻分别设置为高、中、低三个档次的时候，随着混合信号频率的变化，***总增益随之变化，但是，在同样的混合信号频率下，电阻的不同对增益的变化不明显，增益值比较一致。4 is a circuit diagram showing the total gain waveform of the earphone circuit with adjustable feedback active noise reduction level of the present invention as a function of the adjustable amplifier, as shown in FIG. 4, by adjusting the variable resistance of the adjustable amplifier, when When the variable resistors are set to three levels of high, medium and low respectively, the total gain of the system changes with the change of the mixed signal frequency. However, at the same mixed signal frequency, the difference of the gain does not change with the gain. Obviously, the gain values are consistent.
图5是本发明的具有可调反馈式主动降噪电平的耳机电路的另一个实施 例的电路图，如图5所示，所述音频输入部分2还包括第二可调放大器；5 is another implementation of the earphone circuit of the present invention having an adjustable feedback active noise reduction level The circuit diagram of the example, as shown in FIG. 5, the audio input portion 2 further includes a second adjustable amplifier;
所述音频源的音频信号输出至第二可调放大器进行可调放大后，将放大后的音频信号输入至第二过滤器；After the audio signal of the audio source is output to the second adjustable amplifier for adjustable amplification, the amplified audio signal is input to the second filter;
设置第一可调放大器的增益为g1，第二可调放大器的增益为g2，扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B，则：The gain of the first adjustable amplifier is set to g1, the gain of the second adjustable amplifier is g2, the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A, and the gain of the second filter is B, then:
***的噪声增益为：
Figure PCTCN2017000312-appb-000012
The noise gain of the system is:
Figure PCTCN2017000312-appb-000012
***的音频增益为：1+B×g2×g1    (9)The audio gain of the system is: 1+B×g2×g1 (9)
耳机电路的总增益为：
Figure PCTCN2017000312-appb-000013
The total gain of the headphone circuit is:
Figure PCTCN2017000312-appb-000013
令B×g2×g1≈A×g1，则：Let B × g2 × g1 ≈ A × g1, then:
Figure PCTCN2017000312-appb-000014
Figure PCTCN2017000312-appb-000014
以上对本发明所提供的一种具有可调反馈式主动降噪电平的耳机电路进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。The earphone circuit with adjustable feedback active noise reduction level provided by the present invention is described in detail above. The principle and implementation manner of the present invention are described in the following. The description of the above embodiment is only The method for understanding the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The description should not be construed as limiting the invention.
最后应说明的是：以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, although the present invention has been described in detail with reference to the foregoing embodiments, Modifications may be made to the technical solutions described in the foregoing embodiments, or equivalent modifications may be made to some of the technical features, and any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present invention, should be included in Within the scope of protection of the present invention.

Claims (4)

  1. 一种具有可调反馈式主动降噪电平的耳机电路，其特征在于，包括：A headphone circuit with an adjustable feedback active noise reduction level, comprising:
    噪声输入部分、音频输入部分、放大输出部分；a noise input portion, an audio input portion, and an amplified output portion;
    所述噪声输入部分与所述音频输入部分通过加法器混合后，通过放大输出部分对信号放大，然后将信号输出；After the noise input portion and the audio input portion are mixed by an adder, the signal is amplified by amplifying the output portion, and then the signal is output;
    所述噪声输入部分包括麦克风、第一过滤器，所述麦克风接收自然界的噪声与扬声器回传声音的混合信号，将混合信号放大，形成反馈式主动降噪的噪声信号，噪声信号经第一过滤器进行噪声过滤；The noise input portion includes a microphone, a first filter, and the microphone receives a mixed signal of natural noise and a sound returned by the speaker, and amplifies the mixed signal to form a feedback-type active noise-reduction noise signal, and the noise signal is filtered by the first Perform noise filtering;
    所述音频输入部分包括音频源、第二过滤器，所述音频源的音频信号进行放大后，输出至第二过滤器，第二过滤器对音频信号进行过滤，输出过滤后的音频信号；The audio input portion includes an audio source and a second filter. After the audio signal of the audio source is amplified, the audio signal is output to a second filter, and the second filter filters the audio signal to output the filtered audio signal.
    所述放大输出部分包括：可调放大器、第二加法器、放大器、扬声器，所述将噪声输入部分的噪声信号和音频输入部分的音频信号混合，输出至可调放大器，可调放大器对混合信号进行可调放大，然后与音频源的音频信号通过第二加法器混合，输出至放大器进行放大，然后输出至扬声器。The amplified output portion includes: an adjustable amplifier, a second adder, an amplifier, and a speaker, wherein the noise signal of the noise input portion and the audio signal of the audio input portion are mixed, outputted to the adjustable amplifier, and the adjustable amplifier pairs the mixed signal The tunable amplification is performed, and then the audio signal of the audio source is mixed by the second adder, output to the amplifier for amplification, and then output to the speaker.
  2. 根据权利要求1所述的耳机电路，其特征在于，所述扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B，可调放大器的增益为g，则：The earphone circuit according to claim 1, wherein a product of gains of said speaker, said first filter, an amplifier, and a microphone is A, a gain of said second filter is B, and a gain of said adjustable amplifier is g, then:
    ***的噪声增益为：
    Figure PCTCN2017000312-appb-100001
    The noise gain of the system is:
    Figure PCTCN2017000312-appb-100001
    ***的音频增益为：1+B×g；The audio gain of the system is: 1+B×g;
    耳机电路的总增益为：
    Figure PCTCN2017000312-appb-100002
    The total gain of the headphone circuit is:
    Figure PCTCN2017000312-appb-100002
  3. 根据权利要求2所述的耳机电路，其特征在于，所述扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B满足A≈B，则： The earphone circuit according to claim 2, wherein the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A, and the gain of the second filter is B satisfying A≈B, then:
    Figure PCTCN2017000312-appb-100003
    Figure PCTCN2017000312-appb-100003
  4. 根据权利要求1或2所述的耳机电路，其特征在于，所述音频输入部分还包括第二可调放大器；The earphone circuit according to claim 1 or 2, wherein the audio input portion further comprises a second adjustable amplifier;
    所述音频源的音频信号输出至第二可调放大器进行可调放大后，将放大后的音频信号输入至第二过滤器；After the audio signal of the audio source is output to the second adjustable amplifier for adjustable amplification, the amplified audio signal is input to the second filter;
    设置第一可调放大器的增益为g1，第二可调放大器的增益为g2，扬声器、第一过滤器、放大器、麦克风的增益之积为A，第二过滤器的增益为B，则：The gain of the first adjustable amplifier is set to g1, the gain of the second adjustable amplifier is g2, the product of the gain of the speaker, the first filter, the amplifier, and the microphone is A, and the gain of the second filter is B, then:
    ***的噪声增益为：
    Figure PCTCN2017000312-appb-100004
    The noise gain of the system is:
    Figure PCTCN2017000312-appb-100004
    ***的音频增益为：1+B×g2×g1；The audio gain of the system is: 1+B×g2×g1;
    耳机电路的总增益为：
    Figure PCTCN2017000312-appb-100005
    The total gain of the headphone circuit is:
    Figure PCTCN2017000312-appb-100005
    令B×g2×g1≈A×g1，则：Let B × g2 × g1 ≈ A × g1, then:
    Figure PCTCN2017000312-appb-100006
    Figure PCTCN2017000312-appb-100006
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CN107393545B (en) * 2017-07-17 2020-12-08 会听声学科技（北京）有限公司 Feedback type active noise reduction system and method with flexible gain
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101208742A (en) * 2005-05-18 2008-06-25 伯斯有限公司 Adapted audio response
CN101765041A (en) * 2009-06-09 2010-06-30 北京中星微电子有限公司 Audio-frequency playing equipment and method for reducing environmental noises generated during audio-frequency playing
WO2016032523A1 (en) * 2014-08-29 2016-03-03 Harman International Industries, Inc. Auto-calibrating noise canceling headphone
CN106465007A (en) * 2014-03-28 2017-02-22 ams有限公司 Control circuit for active noise control and method for active noise control
CN206533513U (en) * 2017-03-03 2017-09-29 富士高实业有限公司 Head circuit with adjustable feedback formula active noise reduction level

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101208742A (en) * 2005-05-18 2008-06-25 伯斯有限公司 Adapted audio response
CN101765041A (en) * 2009-06-09 2010-06-30 北京中星微电子有限公司 Audio-frequency playing equipment and method for reducing environmental noises generated during audio-frequency playing
CN106465007A (en) * 2014-03-28 2017-02-22 ams有限公司 Control circuit for active noise control and method for active noise control
WO2016032523A1 (en) * 2014-08-29 2016-03-03 Harman International Industries, Inc. Auto-calibrating noise canceling headphone
CN206533513U (en) * 2017-03-03 2017-09-29 富士高实业有限公司 Head circuit with adjustable feedback formula active noise reduction level

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